WO2011132768A1

WO2011132768A1 - Mobile-body broadcast reception device

Info

Publication number: WO2011132768A1
Application number: PCT/JP2011/059897
Authority: WO
Inventors: 清史小谷; 亮太加藤
Original assignee: 三洋電機株式会社; 三洋電機コンシューマエレクトロニクス株式会社
Priority date: 2010-04-22
Filing date: 2011-04-22
Publication date: 2011-10-27

Abstract

Disclosed is a mobile-body broadcast reception device that can receive a broadcast radio wave in a stable state. The device is provided with: a plurality of antennas (14a-14d) that receive RF signals and that are disposed at differing positions on the mobile body; a plurality of amplifiers (low noise amplifiers (LNAa-LNAd)) that amplify the RF signals received by the antennas (14a-14d); a detection means (CPU(30)) that detects the signal levels of the RF signals; a determination means (CPU(30)) that determines whether or not any of the signal levels is at or above a predetermined threshold; and a setting means (switch unit (16)) that, when it has been determined that any of the signal levels is at or above the predetermined threshold, sets all of the amplifiers (low noise amplifiers (LNAa-LNAd)) to a non-operating state wherein the RF signals are not amplified.

Description

Mobile broadcast receiver

The present invention relates to a mobile broadcast receiving apparatus, and more particularly to a mobile broadcast receiving apparatus that is mounted on a mobile body such as a vehicle and receives broadcast radio waves transmitted from a broadcast station.

Some mobile objects such as vehicles are equipped with a broadcast receiving device that can receive and view broadcast radio waves from a television or the like. In such a broadcast receiving apparatus, since the reception state of the broadcast radio wave changes due to a change in the distance from the broadcast station accompanying the movement of the moving body or the influence of buildings around the traveling road, it is difficult to view depending on the location. It may become.

As a measure to improve sensitivity in places where viewing is difficult, there is a configuration in which broadcast radio waves received by an antenna are amplified by a low noise amplifier (LNA) and supplied to a tuner. In this case, although there is an effect of improving the sensitivity in a weak electric field, the gain (gain) is too large in a strong electric field, so that the input characteristics of the broadcast radio wave deteriorates and the video freezes or block noise occurs. Such a problem will occur.

In order to avoid such a problem, for example, in the following Patent Document 1 (Japanese Patent Laid-Open No. 2008-109533), the signal level of a broadcast radio wave received by an antenna is detected, and the signal level is below a predetermined threshold (weak). In the electric field environment, the signal level is amplified by the LNA and supplied to the tuner. On the other hand, when the signal level is higher than a predetermined threshold (strong electric field environment), the LNA is bypassed and the broadcast radio wave is directly supplied to the tuner. A digital broadcast receiver and a control method are disclosed.

According to this Patent Document 1, it is possible to view a desired broadcast regardless of fluctuations in the signal level of a received broadcast radio wave and to save power by not operating the LNA unnecessarily. However, since the LNA is only switched according to the signal level, for example, in a place where the signal level of the broadcast signal frequently fluctuates depending on surrounding buildings, such as when the vehicle is traveling in an urban area. , Switching of LNA frequently occurs, and video and audio are disturbed, resulting in a problem that the viewing state of the broadcast is not stable.

In Patent Document 2 (Japanese Patent Laid-Open No. 2006-261710), when the IF-AGC control voltage exceeds a first threshold, an RF signal that is a broadcast radio wave is amplified by a preamplifier and supplied to a tuner. On the other hand, when the RF-AGC control voltage falls below the second threshold, the preamplifier is bypassed and the RF signal is supplied to the tuner, thereby reducing the switching frequency of the preamplifier and avoiding hunting. A mobile broadcast digital broadcast receiver is disclosed. Further, in this mobile receiver digital broadcast receiver, in a diversity system including two receiving circuits, hunting can be further avoided by configuring the receiving circuits of both systems not to be switched simultaneously.

JP 2008-109533 A (Claim 1) JP 2006-261710 A (Claims 1 and 3)

However, as disclosed in Patent Document 2, when switching between bypassing the preamplifier for each of the plurality of preamplifiers or amplifying the preamplifier and supplying the preamplifier to the tuner, The following problems can occur.

For example, if there is no influence of a building such as a building at the current position, even if the IF-AGC control voltage is greater than or equal to a first threshold value, the IF-AGC control voltage is less than the second threshold value due to the influence of the building. Only the following may be obtained. At this time, even if an IF-AGC control voltage equal to or higher than the first threshold is obtained in any of the antennas, if the IF-AGC control voltage is equal to or lower than the second threshold in the other antennas, Is switched to amplify the RF signal received by the preamplifier and supply it to the tuner.

That is, when the IF-AGC control voltage of only the RF signal received by an antenna is temporarily lowered due to the influence of the building, the RF signal is switched to be amplified by the preamplifier and supplied to the tuner. Then, when moving away from the effects of temporary buildings with movement, the IF-AGC control voltage of the RF signal received by the antenna is equal to or higher than the first threshold value, so the preamplifier is switched to bypass. As a result, it becomes necessary to frequently switch whether or not the preamplifier is bypassed, resulting in a problem that wasteful power consumption is consumed.

An object of the present invention is to solve the above-described problems, and provide a mobile broadcast receiver capable of receiving broadcast radio waves in a stable state and further saving power consumption. It is intended to do.

In order to solve the above-mentioned problem, the first invention of the present application is mounted on a mobile body, and is arranged at a different position of the mobile body in a mobile broadcast receiver that receives broadcast radio waves transmitted from a broadcasting station, A plurality of antennas for receiving the broadcast radio waves, a plurality of amplifiers for amplifying the broadcast radio waves received by the antennas, and detecting means for detecting the signal levels of the broadcast radio waves, and the signal levels An arithmetic processing unit that functions as a determination unit that determines whether or not any of the signal levels is equal to or greater than a predetermined threshold, and when any of the signal levels is determined to be equal to or greater than the predetermined threshold, all the amplifiers are Setting means for setting to a non-operating state in which broadcast radio waves are not amplified.

Further, according to a second invention of the present application, in the first invention, the arithmetic processing unit further functions as stop determination means for determining whether or not the moving body is traveling based on an output of the sensor unit, and the setting The means sets all the amplifiers to a non-operating state that does not amplify each of the broadcast radio waves when it is determined that the moving body is running and any of the signal levels is determined to be greater than or equal to the predetermined threshold. It is characterized by doing.

According to a third aspect of the present invention, there is provided a mobile broadcast receiving apparatus that is mounted on a mobile body and receives broadcast radio waves transmitted from a broadcasting station, and is disposed at a different position of the mobile body and receives the broadcast radio waves. It functions as a plurality of antennas, a plurality of amplifiers for amplifying each of the broadcast radio waves received by each of the antennas, and a detection means for detecting each signal level of each of the broadcast radio waves, and each of the signal levels is below a predetermined threshold value An arithmetic processing unit that functions as a determination means for determining whether or not each of the signal levels is determined to be less than or equal to the predetermined threshold value, and all the amplifiers are in an operating state for amplifying each of the broadcast radio waves. Setting means for setting.

According to a fourth aspect of the present invention, in the third aspect, the arithmetic processing unit further functions as stop determination means for determining whether or not the moving body is running based on an output of the sensor unit, and the setting The means sets all the amplifiers to an operating state for amplifying each of the broadcast radio waves when it is determined that the moving body is running and all of the signal levels are determined to be equal to or less than the predetermined threshold. It is characterized by.

According to a fifth aspect of the present invention, in a mobile broadcast receiving apparatus that is mounted on a mobile body and receives broadcast radio waves transmitted from a broadcasting station, the mobile radio receiver is disposed at a different position of the mobile body and receives the broadcast radio waves. It functions as a plurality of antennas, a plurality of amplifiers for amplifying each of the broadcast radio waves received by each of the antennas, and detection means for detecting each signal level of each of the broadcast radio waves, and any one of the signal levels is the first It functions as first determination means for determining whether or not it is greater than or equal to a threshold value, and functions as second determination means for determining whether or not all the signal levels are equal to or less than a second threshold value that is smaller than the first threshold value And when all of the signal levels are smaller than the first threshold value and any one of the signal levels is larger than the second threshold value, the operations of all the amplifiers are performed. Characterized by comprising setting means for setting state so as to maintain a.

Further, a sixth invention of the present application is the fifth invention, wherein the arithmetic processing unit further functions as stop determination means for determining whether or not the moving body is running based on an output of the sensor unit, and the setting When it is determined that the moving body is traveling, all of the signal levels are less than the first threshold value, and any of the signal levels is determined to be greater than the second threshold value. The operation state of all the amplifiers is maintained as it is.

According to a seventh aspect of the present invention, in a mobile broadcast receiving apparatus that is mounted on a mobile body and receives broadcast radio waves transmitted from a broadcasting station, the mobile radio receiver is disposed at a different position of the mobile body and receives the broadcast radio waves. Functions as a plurality of antennas, a plurality of amplifiers that amplify each of the broadcast radio waves received by each of the antennas, a communication unit that receives at least signal information, and a detection means that detects each signal level of each of the broadcast radio waves, It functions as a determination unit that determines whether any of the signal levels is equal to or higher than a predetermined threshold, and determines whether the moving body is traveling based on the output of the sensor unit. An arithmetic processing unit that functions as a stop determination unit that specifies a stop time based on the traffic signal information received by the communication unit and determines whether the stop time is less than a predetermined time; and the stop time Setting means for setting all the amplifiers to a non-operating state that does not amplify each of the broadcast radio waves when it is determined that the time is less than the time and any of the signal levels is determined to be equal to or greater than the predetermined threshold; It is characterized by providing.

According to an eighth aspect of the present invention, in a mobile broadcast receiving apparatus mounted on a mobile body and receiving a broadcast radio wave transmitted from a broadcast station, the mobile radio receiver is disposed at a different position of the mobile body and receives the broadcast radio wave. Functions as a plurality of antennas, a plurality of amplifiers that amplify each of the broadcast radio waves received by each of the antennas, a communication unit that receives at least signal information, and a detection means that detects each signal level of each of the broadcast radio waves, It functions as a determination unit that determines whether or not all the signal levels are equal to or less than a predetermined threshold, and determines whether or not the moving body is traveling based on the output of the sensor unit. An arithmetic processing unit that functions as a stop determination unit that determines a stop time based on the traffic signal information received by the communication unit and determines whether the stop time is less than a predetermined time; Setting means for setting all of the amplifiers to an operating state for amplifying each of the broadcast radio waves when it is determined that the signal level is less than the interval and all of the signal levels are determined to be equal to or less than the predetermined threshold value. It is characterized by that.

Further, a ninth invention of the present application is the mobile broadcast receiving apparatus according to any one of the first to eighth inventions, wherein the setting means is connected between each of the antennas and each of the amplifiers. A broadcast radio wave is supplied to each of the amplifiers, or is configured by a changeover switch that bypasses each of the amplifiers.

According to the present invention, the amplifier is not frequently turned on and off, and the broadcast can be viewed in a stable state. In addition, wasteful power consumption due to frequent switching can be suppressed, and power consumption can be saved, which can contribute to power saving sufficiently.

1 is a configuration block diagram of a mobile broadcast receiver in an embodiment of the present invention. It is an operation | movement flowchart of the mobile broadcast receiver in the Example of this invention. It is explanatory drawing of the relationship between the AGC level of the broadcast radio wave received by each antenna in the Example of this invention, and the ON / OFF state of a low noise amplifier. 1 is a configuration block diagram of a mobile broadcast receiver in an embodiment of the present invention. It is an operation | movement flowchart of the mobile broadcast receiver in the Example of this invention. It is an operation | movement flowchart of the mobile broadcast receiver in the Example of this invention.

Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiment described below exemplifies a mobile broadcast receiver for embodying the technical idea of the present invention, and is intended to specify the present invention as this mobile broadcast receiver. However, the present invention is equally applicable to the mobile broadcast receiving apparatus of other embodiments included in the scope of claims.

FIG. 1 is a block diagram showing a configuration of a mobile broadcast receiving apparatus 10 mounted on an automobile according to an embodiment of the present invention. The mobile broadcast receiving apparatus 10 is a diversity type receiving apparatus having a plurality of antennas 14a to 14d for receiving broadcast radio waves transmitted from the broadcast station 12, that is, RF signals (high frequency band signals). The antennas 14a to 14d are arranged at different parts of the automobile (for example, upper left, upper right, left side, right side, etc. of the windshield of the car). The mobile broadcast receiving device 10 can be mounted on a navigation device or the like that searches for a route to a destination based on the current position and map information and displays the searched route.

The RF signals received by the antennas 14a to 14d are supplied to the low noise amplifiers LNAa to LNAd (amplifiers) via the changeover switches 18a to 18d (setting means) constituting the switch unit 16, or the bypass line 20a. To 20 d directly from the tuner unit 22.

The tuner unit 22 includes AGC circuits 24a to 24d that automatically adjust the gains of the RF signals amplified by the low noise amplifiers LNAa to LNAd or the RF signals supplied via the bypass lines 20a to 20d, and the AGC circuits. A signal synthesis circuit 26 that synthesizes RF signals whose gains are adjusted by the circuits 24a to 24d, and a tuner circuit 28 that selects an RF signal having a desired frequency from the synthesized RF signals.

Further, the mobile broadcast receiving apparatus 10 includes a CPU 30 (operation processing unit 30 functioning as a detection unit, a determination unit, a first determination unit, and a second determination unit) that performs operation control. The CPU 30 switches and controls the changeover switches 18a to 18d of the switch unit 16 based on the AGC level that is the level of the RF signal adjusted by the AGC circuits 24a to 24d constituting the tuner unit 22. The changeover switches 18a to 18d are ON / OFF controlled to connect the antennas 14a to 14d and the low noise amplifiers LNAa to LNAd, or the antennas 14a to 14d and the bypass lines 20a to 20d.

In the following description, it is assumed that connecting the antennas 14a to 14d and the low noise amplifiers LNAa to LNAd (using the low noise amplifiers LNAa to LNAd) sets the low noise amplifiers LNAa to LNAd to the operating state. The connection of 14a to 14d and the bypass lines 20a to 20d (not using the low noise amplifiers LNAa to LNAd) will be described as setting the low noise amplifiers LNAa to LNAd to the non-operating state.

Further, as will be described later, when all of the AGC levels of the respective RF signals are equal to or lower than the second threshold B, the low noise amplifiers LNAa to LNAd are changed from a state where the low noise amplifiers LNAa to LNAd are not used (non-operating state). In addition to the case of changing to the use state (operation state), the case of maintaining the state (operation state) using the low noise amplifiers LNAa to LNAd will be described as being included in the setting of the operation state. The same applies when the non-operating state is set.

Note that the signal (level) used when the CPU 30 performs switching control of the changeover switches 18a to 18d of the switch unit 16 is not limited to the AGC level, but is a signal having a predetermined relationship with the RF signal level. These signals may also be used.

The CPU 30 is selected by an operation unit 32 that receives an operation input from a user, a ROM / RAM 34 that stores a program and processing data for controlling the operation of the mobile broadcast receiving device 10, and a tuner circuit 28 of the tuner unit 22. An output control unit 38 that performs control for outputting an image or sound based on the RF signal to the output unit 36 is connected. The operation unit 32 includes a touch panel and a remote controller. For example, the operation unit 32 can specify a channel with respect to the tuner circuit 28 and can adjust a volume with respect to the output control unit 38. The output unit 36 can be a liquid crystal display panel, a speaker, or the like.

In the mobile broadcast receiving apparatus 10 according to the present invention, if at least one of the AGC levels of the RF signal is equal to or higher than a predetermined threshold, the vehicle on which the mobile broadcast receiving apparatus 10 is mounted sufficiently receives the RF signal from the broadcast station 12. It is clear that you are in a place with a strong electric field environment where you can easily receive. In this case, even if the AGC level of other RF signals is lower than the threshold value, it is considered that the AGC level is temporarily lowered due to the shadow of the building, etc. Therefore, the AGC level should recover if the vehicle moves a little. is there. Therefore, by setting the low noise amplifiers LNAa to LNAd not to be used (non-operating state) for all RF signals, the low noise amplifiers LNAa to LNAd can be prevented from being frequently turned on and off, and stable. You can watch the broadcast in this state. Moreover, since frequent switching can be prevented, it can sufficiently contribute to power saving.

On the other hand, if the AGC levels of all the RF signals are equal to or lower than the threshold value, it is determined that the vehicle equipped with the mobile broadcast receiving device 10 is far from the broadcast station 12 and is in a weak electric field environment, and the low noise amplifier LNAa ~ LNAd is set to be used (operating state) so that a desired broadcast can be viewed in a stable state.

Here, the predetermined threshold value is set as a first threshold value A and a second threshold value B lower than the first threshold value A. If at least one of the AGC levels of the RF signal is equal to or higher than the first threshold value A, the low noise amplifiers LNAa to LNAd On the contrary, if the AGC levels of all the RF signals are equal to or lower than the second threshold value B, if the low noise amplifiers LNAa to LNAd are used, the amplifiers LNAa to LNAd are turned on (connected) and turned off ( (Non-connection) The control can be provided with a hysteresis characteristic, and the problem that the amplifier is frequently switched can be effectively solved.

In the case where the low noise amplifiers LNAa to LNAd are used (operating state), if at least one of the AGC levels of the RF signal is equal to or higher than the predetermined threshold A, the low noise amplifiers LNAa to LNAd are applied to all the RF signals. Is set not to be used (inactive state), but when the low noise amplifiers LNAa to LNAd are not used (inactive state), at least one of the AGC levels of the RF signal is equal to or higher than a predetermined threshold A. Also in this case, setting is made so that the low noise amplifiers LNAa to LNAd are not used (non-operating state) for all RF signals. The same applies when the operation state is set.

Further, when it is determined that all of the RF signal levels are smaller than the first threshold A and any of the RF signal levels is larger than the second threshold B, the states of the low noise amplifiers LNAa to LNAd Is maintained as it is. Accordingly, by maintaining the low noise amplifiers LNAa to LNAd in the current state, the amplifier is not frequently turned on and off, and a desired broadcast can be viewed in a stable state.
The mobile broadcast receiving apparatus 10 of the present embodiment is basically configured as described above. Next, with respect to its operation, the flowchart shown in FIG. 2 and the AGC level shown in FIG. A description will be given based on an explanatory diagram of the relationship between the ON and OFF states of the low noise amplifiers LNAa to LNAd.

The user designates the channel of the broadcasting station that he / she wants to view by operating the operation unit 32 while the vehicle is running. The CPU 30 instructs the designated channel to the tuner circuit 28 of the tuner unit 22 and starts receiving a desired RF signal from the broadcast station 12.

The antennas 14a to 14d of the mobile broadcast receiving apparatus 10 receive the RF signal from the broadcast station 12 (step S101), and supply it to the tuner unit 22 via the changeover switches 18a to 18d and the low noise amplifiers LNAa to LNAd. It is assumed that the changeover switches 18a to 18d are initially connected to the antennas 14a to 14d and the low noise amplifiers LNAa to LNAd. Accordingly, the received RF signal is amplified by the low noise amplifiers LNAa to LNAd and supplied to the tuner unit 22.

The AGC circuits 24 a to 24 d of the tuner unit 22 adjust the gain of each supplied RF signal, and supply the adjusted RF signal to the signal synthesis circuit 26. The signal synthesis circuit 26 synthesizes the supplied RF signals and supplies the synthesized RF signals to the tuner circuit 28. The signal synthesis circuit 26 performs various synthesis processes such as a process of simply adding the RF signals from the AGC circuits 24a to 24d, a process of averaging, and a process of selecting an RF signal having the highest signal level. Can do.

The tuner circuit 28 selects the RF signal of the designated channel from the synthesized RF signal and supplies it to the output control unit 38. The output control unit 38 controls the output unit 36 based on the RF signal to output a desired image and sound.

The CPU 30 detects the AGC level of each RF signal adjusted by the AGC circuits 24a to 24d (step S102) and compares it with a predetermined threshold A (first threshold) and threshold B (second threshold) (A> B). To do.
Here, when any AGC level of the RF signal is equal to or higher than the threshold A (step S103, YES), the CPU 30 switches the changeover switches 18a to 18d to the bypass lines 20a to 20d side, thereby reducing the low noise amplifiers LNAa to LNAa. All of the LNAd are set to an OFF state (non-operating state) (see step S104, FIG. 3, time t = t1).

That is, if at least one of the AGC levels of the RF signal is greater than or equal to the threshold A, the automobile equipped with the mobile broadcast receiver 10 is in a place where the RF signal from the broadcast station 12 can be sufficiently received. An RF signal can be reliably received without using LNAa to LNAd. That is, if at least one of the AGC levels of the RF signal is greater than or equal to the threshold A, the low noise amplifiers LNAa to LNAd are not frequently turned on and off due to fluctuations in the RF signal, and the broadcast can be viewed in a stable state. Can do. Further, since the RF signal is not amplified unnecessarily, it is possible to sufficiently contribute to power saving.

When the AGC levels of all the RF signals are smaller than the threshold A (step S103, NO) and at least one of the AGC levels of the RF signals is larger than the threshold B (step S105, NO), the low noise amplifiers LNAa to LNAd Keep everything in the current state.

For example, in the case where all of the low noise amplifiers LNAa to LNAd are set to the OFF state in step S104, if at least one of the AGC levels of the RF signal is larger than the threshold value B, the automobile on which the mobile broadcast receiving device 10 is mounted. Is in a place where the RF signal from the broadcasting station 12 can be received, the RF signal can be received without using the low noise amplifiers LNAa to LNAd. Also, the low noise amplifiers LNAa to LNAd are not frequently turned on and off due to fluctuations in the RF signal, and the broadcast can be viewed in a stable state. Furthermore, since the RF signal is not amplified unnecessarily, it can sufficiently contribute to power saving.

Similarly, when all of the low noise amplifiers LNAa to LNAd are set to the ON state, if all of the AGC levels of the RF signals are equal to or lower than the threshold A, the low noise amplifiers LNAa to LNAd are maintained in the ON state. By doing so, the broadcast can be viewed in a stable state.

When all the AGC levels are equal to or lower than the threshold value B (step S105, YES), the CPU 30 switches the changeover switches 18a to 18d to the low noise amplifiers LNAa to LNAd and turns on all the low noise amplifiers LNAa to LNAd (operating state). (See step S106, FIG. 3, time t = t2). That is, even when all the antennas 14a to 14d can receive only RF signals having a weak electric field, the RF signals are amplified by the low noise amplifiers LNAa to LNAd, and a good reception state can be obtained.

Therefore, in the first embodiment, the CPU 30 (arithmetic processing unit 30) functions as a detection unit, a determination unit, a first determination unit, and a second determination unit. In addition, this invention is not limited to Example 1 mentioned above, It can change in the range which does not deviate from the summary of this invention.

For example, instead of switching on and off the low noise amplifiers LNAa to LNAd by switching the bypass lines 20a to 20d and the low noise amplifiers LNAa to LNAd by the switch unit 16 disposed in front of the low noise amplifiers LNAa to LNAd, the CPU 30 The low noise amplifiers LNAa to LNAd may be configured to be directly ON / OFF controlled. The antennas 14a to 14d may be any antennas that are arranged at two or more different positions of the mobile broadcast receiving apparatus 10.

In the first embodiment, the AGC circuits 24a to 24d of the tuner unit 22 adjust the gain of each supplied RF signal, supply the adjusted RF signal to the signal synthesis circuit 26, and the signal synthesis circuit 26 The supplied RF signals are synthesized and then supplied to the tuner circuit 28. However, the present invention is not limited to this, and the AGC circuits 24a to 24d of the tuner unit 22 adjust the gains of the supplied RF signals, Each adjusted RF signal is supplied to a plurality of tuner circuits (a number corresponding to the number of antennas), and each tuner circuit is configured to select an RF signal of a designated channel and supply it to the signal synthesis circuit 26. May be.

The antennas 14a to 14d are arranged at different positions of the automobile such as the upper left, upper right, left side, and right side of the windshield of the automobile (an example of a moving body), but are not limited to this position. The upper left and upper right of the windshield of the automobile and the upper left and upper right of the rear glass may be used.

In addition, the center point and end point of the two antennas are at the same position and the directions of the two antennas are different from each other (for example, one is in the horizontal direction and the other is in the vertical direction). However, it is preferable to consider that they are arranged at different positions.

As described above, according to the mobile broadcast receiving apparatus according to the first embodiment described above, if any of the signal levels of each broadcast radio wave is equal to or higher than the predetermined threshold, all amplifiers are set to the OFF state to amplify the broadcast radio wave. The desired broadcast can be viewed without having to do so. In this case, since the amplifier is not frequently turned on and off, the broadcast can be viewed in a stable state. In addition, wasteful power consumption due to frequent switching can be suppressed, and power consumption can be saved, which can sufficiently contribute to power saving.

If all the signal levels of each broadcast radio wave are equal to or lower than a predetermined threshold, all the amplifiers are set to the ON state to amplify the broadcast radio wave, and a desired broadcast can be viewed in a stable state. In addition, wasteful power consumption due to frequent switching can be suppressed, and power consumption can be saved, which can sufficiently contribute to power saving. Further, when all the signal levels of each broadcast radio wave are smaller than the first threshold value and any of the signal levels is larger than the second threshold value, the amplifier is frequently operated by maintaining the current state of the amplifier. The desired broadcast can be viewed in a stable state without being turned ON or OFF. Further, since the amplifier is not frequently turned on and off, wasteful power consumption can be suppressed, and power consumption can be saved.

As described above, according to the mobile broadcast receiver 10 according to the first embodiment, if at least one of the AGC levels of the RF signal is equal to or higher than the threshold A, the AGC levels of the other RF signals are equal to or lower than the threshold A. However, all the low-noise amplifiers LNAa to LNAd are not used (set to a non-operational state).

The reason why the mobile broadcast receiving device 10 according to the first embodiment is configured as described above is that, as described above, if at least one of the AGC levels of the RF signal is equal to or greater than the threshold A, the mobile broadcast receiving device 10 is mounted. Since it is clear that the car is in a strong electric field environment where the RF signal from the broadcasting station 12 can be sufficiently received, even if the AGC level of the other RF signal is lower than the threshold A, it is temporarily caused by the shadow of the building. This is because the AGC level is considered to be lowered, and the AGC level is considered to recover if the vehicle moves a little.

That is, in order to recover the AGC level lower than the threshold A, it is considered that the vehicle (mobile broadcast receiving device 10) needs to move. Therefore, when the vehicle is moving (running), the RF signal If at least one of the AGC levels is equal to or higher than the threshold A, it is preferable not to use all the low-noise amplifiers LNAa to LNAd (set them to the non-operating state).

Therefore, the mobile broadcast receiving apparatus 10 ′ according to the second embodiment described below is configured to determine whether or not the automobile is running and appropriately control ON / OFF of the low noise amplifiers LNAa to LNAd. ing.

Hereinafter, the mobile broadcast receiving apparatus 10 ′ according to the second embodiment will be described in detail with reference to FIGS. Of the elements constituting the mobile broadcast receiving apparatus 10 ′ according to the second embodiment, the same elements as those of the mobile broadcast receiving apparatus 10 according to the first embodiment are denoted by the same reference numerals.

FIG. 4 is a block diagram showing a configuration of a mobile broadcast receiving apparatus 10 ′ mounted on an automobile according to an embodiment of the present invention. The mobile broadcast receiving apparatus 10 ′ is a diversity type receiving apparatus having a plurality of antennas 14a to 14d for receiving broadcast radio waves transmitted from the broadcast station 12, that is, RF signals (high frequency band signals). The antennas 14a to 14d are arranged at different parts of the automobile (for example, upper left, upper right, left side, right side, etc. of the windshield of the car). The mobile broadcast receiving device 10 ′ can be mounted on a navigation device or the like that searches for a route to a destination based on the current position and map information and displays the searched route.
In addition, description is abbreviate | omitted about the structure same as said mobile broadcast receiver 10. FIG.

The mobile broadcast receiving apparatus 10 ′ and the mobile broadcast receiving apparatus 10 (see FIG. 1) are different in that they include a sensor unit 31 and a communication unit 33.

The sensor unit 31 includes a GPS receiver, for example. The GPS receiver receives radio waves (GPS satellite signals) including time information from a plurality of GPS satellites orbiting over the earth, and calculates the current position of the mobile broadcast receiver 10 ′ based on the received information.
The sensor unit 31 may include autonomous navigation means such as an acceleration sensor, an angular velocity sensor, an azimuth sensor, and a vehicle speed sensor, and the output (for example, acceleration, velocity, absolute azimuth, etc.) of each sensor is the CPU 30. To be supplied. Note that the current position calculated by the GPS receiver based on the output of each sensor may be supplemented.

The sensors such as the acceleration sensor, the angular velocity sensor, the azimuth sensor, and the vehicle speed sensor may be included in the sensor unit 31 (the mobile broadcast receiver 10 ′). However, the sensor such as the vehicle speed sensor may be included in the mobile broadcast receiver. It is good also as a structure with which the vehicle which 10 'is mounted is equipped and the sensor part 31 (mobile broadcast receiver 10') has the interface which acquires the output of the sensor (for example, vehicle speed sensor) with which the vehicle was equipped.

In addition, the mobile broadcast receiving device 10 ′ may include a map storage unit (not shown) in which map information (node data / link data) is stored. In this case, the CPU 30 displays the current position and the map information. Based on this, it is possible to perform a map matching process.

The map matching process may be performed by the CPU 30, but may be performed by the sensor unit 31. That is, map matching processing may be performed based on the current position and map information detected using a GPS receiver and / or autonomous navigation means, and the current position after the map matching processing may be output to the CPU 30 as the current position. . Or it is good also as the sensor part 31 including the map matching process of CPU30.

The communication unit 33 includes at least a receiving unit (not shown) that receives information transmitted from another communication device. The communication method is preferably non-contact communication such as wireless communication or infrared communication.

Other communication devices include an in-vehicle communication device mounted on another vehicle (a mobile communication terminal such as a mobile phone held by the pedestrian when a pedestrian is on the other vehicle), roadside And mobile communication terminals such as mobile phones possessed by machines, pedestrians, etc. (pedestrians, bicycle drivers, etc.).

The information received by the communication unit 33 from the roadside device includes intersection information and traffic signal information. The communication unit 33 may receive intersection information and traffic signal information from an in-vehicle communication device such as a navigation device mounted on another vehicle, a mobile communication terminal such as a mobile phone, and the like in addition to the roadside device. The communication unit 33 does not receive single intersection information or traffic signal information (information of one intersection and traffic signals installed at the intersection), but receives intersection information and traffic signal information for each of a plurality of intersections. May be. In this case, intersection information and traffic signal information for each of a plurality of intersections may be transmitted from one roadside device.

Here, the intersection information and traffic signal information received by the communication unit 33 will be described. In the following explanation, a roadside device is installed at each intersection where a traffic signal is installed, and the information on the intersection where the roadside device is installed (intersection information) and the intersection where the roadside device is installed are installed from the roadside device. It is assumed that information including signal information (signal information) being transmitted is transmitted.

In the intersection information, information indicating the center position coordinates (latitude / longitude) of the intersection, information for identifying the roadside device (intersection), and a traffic signal associated with the route (direction of approach to the intersection) are identified. Such information as identification information (signal number) is included.

In the traffic signal information, identification information (signal number) for identifying the traffic signal, current signal display information of the traffic signal (information indicating the display color of the traffic signal), next signal display information, current signal display is the next signal display Information such as information indicating the time until the change is made.

Here, the traffic signal information includes information such as the current signal display information of the traffic signal for each traffic signal. That is, since the traffic signal information is information on traffic signals installed at the intersection where the roadside device is installed, if the intersection where the roadside device is installed is a four-way, four traffic signals are installed. Therefore, the traffic signal information is changed to identification information (signal number) for identifying the traffic signal, current signal display information (information indicating the display color of the traffic signal), and the next signal display for each of the four traffic signals. It includes information such as information indicating the time until completion.

In addition, since the intersection information and the traffic signal information are associated with each other, a plurality of traffic signals (if the vehicle is a four-way road) indicated by the traffic signal information associated with the same intersection information (information identifying the same intersection) 4 traffic lights) are installed at the same intersection.
In addition, “identification information for identifying a traffic signal (signal number)” associated with a route included in the intersection information and “identification information for identifying a traffic signal (signal number)” included in the traffic signal information are: It is associated.

Therefore, the current signal display of the traffic signal associated with a certain route (based on information indicating the current signal display of the traffic signal having the same identification information as the identification information for identifying the traffic signal) is specified. Is possible.

The CPU 30 determines whether or not the vehicle is running (stopped) based on the output of the sensor unit 31. If the vehicle is stopped (stopped), the CPU 30 is based on information received by the communication unit 33. It also functions as a stop determination unit that specifies a stop time (stop time) and determines whether the stop time is less than a predetermined time. Accordingly, the CPU 30 (arithmetic processing unit 30) functions not only as a detection unit, a determination unit, a first determination unit, and a second determination unit, but also as a stop determination unit, as in the first embodiment.

The mobile broadcast receiving apparatus 10 ′ includes switch units 16a to 16d and individually controls the switches 18a to 18d (for example, the switch 18a is switched to the low noise amplifier LNAa side, and the low noise amplifier LNAa is switched on). ON (operating state), switching the switch 18b to the bypass line 20b side, and setting the low noise amplifier LNAb to OFF (non-operating state)).

By performing the same control (instruction) on the switch units 16a to 16d, all of the low noise amplifiers LNAa to LNAd are controlled (for example, by switching the changeover switches 18a to 18d to the bypass lines 20a to 20d side, All of the low-noise amplifiers LNAa to LNAd can be set to an OFF state (non-operating state).

Next, the operation of the mobile broadcast receiving apparatus 10 ′ will be described with reference to the flowchart of FIG.
Steps S201 and S202 are the same as steps S101 and S102, and steps S204 to S207 are the same as steps S103 to S106.

In step S203, the CPU 30 determines whether the vehicle is traveling (stopped) based on the output of the sensor unit 31 (step S203).
Various methods can be used to determine whether or not the vehicle is running. For example, when the moving speed calculated from the output of the vehicle speed sensor or the acceleration sensor is equal to or higher than a threshold, it can be determined that the vehicle is running. The moving speed may be calculated from the difference between the travel distance between GPS histories and the GPS reception time.

When the vehicle is running (not stopped) (step S203, YES), the process proceeds to step S204, and when any AGC level of the RF signal is equal to or higher than the threshold A (step S204, YES), the CPU 30 switches the changeover switch 18a. By switching ˜18d to the bypass lines 20a to 20d side, all of the low noise amplifiers LNAa to LNAd are set to an OFF state (non-operating state) (step S205).

When all the AGC levels of the RF signal are equal to or lower than the threshold value B (step S206, YES), the CPU 30 switches the changeover switches 18a to 18d to the low noise amplifiers LNAa to LNAd, and all the low noise amplifiers LNAa to LNAd are connected. Is set to ON (operating state) (step S207).

If it is determined in step S203 that the CPU 30 is not traveling (stopped) (NO in step S203), the process proceeds to step S208, and the low noise amplifiers LNAa to LNAd are set to ON (operating state). Whether or not (set to OFF (non-operating state)) is determined for each of the low noise amplifiers LNAa to LNAd, and setting (operating state or non-operating state) is performed according to the determination result.

That is, when the AGC level of the RF signal received by the antenna 14a is equal to or higher than the threshold A, the CPU 30 switches the changeover switch 18a to the bypass line 20a side (sets it to the non-operating state), and the antenna 14a receives it. When the AGC level of the RF signal is equal to or lower than the threshold value B, the CPU 30 switches the changeover switch 18a to the low noise amplifier LNAa side (sets the operation state). When the AGC level of the RF signal received by the antenna 14a is smaller than the threshold A and larger than the threshold B, the changeover switch 18a is maintained in the current state.

This setting is performed for each changeover switch 18a to 18d (switch unit 16a to 16d). As a result, an RF signal having a low AGC level (below the threshold value B) is amplified, and an RF signal having a sufficiently high AGC level (above the threshold value A) is not amplified. For example, when the AGC level of the RF signal received by the

antennas

14a and 14b is small (threshold B or lower) and the AGC level of the RF signal received by the

antennas

14c and 14d is high (threshold A or higher), the changeover switches 18a and 18b are activated. The changeover switches 18c and 18d are set to the non-operating state.

As a result, the amplifier is not frequently turned on and off during traveling, and the broadcast can be viewed in a stable state. In addition, wasteful power consumption due to frequent switching can be suppressed, and power consumption can be saved, which can sufficiently contribute to power saving.
In addition, when the vehicle is not moving (when the vehicle is stopped), that is, when the change in the AGC level of the RF signal accompanying the movement is not desired, each RF signal is determined based on the AGC level of each RF signal. In order to determine whether or not to amplify each, it is possible to effectively use the RF signal that can be received now.

When the changeover switches 18a to 18d are collectively controlled as in the mobile broadcast receiving apparatus 10 described above, in the process of step S208, for example, the RF signal with a large AGC level (threshold A or more) is more than half (for example, this If there are three or more in the embodiment, the changeover switches 18a to 18d are set to the non-operating state, and the AGC level is low (threshold B or less) and more than half of the RF signals (for example, three or more in this embodiment). ), The change-over switches 18a to 18d may be set to the operating state.

In step S203, when the vehicle is traveling (not stopped) (step S203, YES), the process proceeds to step S204, but before the process proceeds to step S204, the changeover switches 18a to 18d are connected to the low noise amplifiers LNAa to LNAd side. Alternatively, it is preferable to switch to the bypass lines 20a to 20d side.

That is, when the vehicle starts running while the vehicle is stopped, the switches 18a to 18d may be individually switched to the low noise amplifier side or the bypass line side while the vehicle is stopped. In such a case, the AGC level of the amplified RF signal and the AGC level of the unamplified RF signal are mixed in the AGC level to be compared with the threshold (A · B) in Step S204 and Step S206. End up.

Therefore, it is preferable to switch the changeover switches 18a to 18d to the low noise amplifiers LNAa to LNAd side or the bypass lines 20a to 20d side before proceeding to step S204. In step S204 and step S206, the threshold value (A · B) is set. The AGC level to be compared with is preferably the AGC level of the RF signal after the selector switches 18a to 18d are switched to any one (the low noise amplifiers LNAa to LNAd side or the bypass lines 20a to 20d side).

Note that whether the switches 18a to 18d are switched to the low noise amplifiers LNAa to LNAd side or the bypass lines 20a to 20d side depends on, for example, the number of changeover switches connected to the low noise amplifier side and the bypass line side. The number of changeover switches connected to the switch may be larger (for example, if there are three changeover switches connected to the noise amplifier side and one changeover switch connected to the bypass line side). if, it switches the changeover switches 18a ~ 18 d to the low-noise amplifier LNAa ~ LNAd side), and may set the switch to either advance.

Subsequently, the operation of another embodiment of the mobile broadcast receiving apparatus 10 ′ will be described with reference to the flowchart of FIG.

Further, in the flowchart of FIG. 6, taking into account the stop time, it is possible to prevent frequent control during the stop (step S208 in FIG. 5) and the control during travel (steps S204 to S207 in FIG. 5). To do.

That is, only when the stop time is long, control during stop (step S208 in FIG. 5) is performed, so that control during stop (step S208 in FIG. 5) and control during travel (steps S204 to S207 in FIG. 5) are performed. ) Is prevented from being performed frequently.
Steps S301 and S302 are the same as steps S101 and S102, steps S304 to S307 are the same as steps S103 to S106, and step S303 is the same as step S203.

In the process of step S303, when it is determined that the CPU 30 is not traveling based on the output of the sensor unit 31 (determined that the vehicle is stopped) (step S303, NO), the process proceeds to step S308, and the CPU 30 determines whether the vehicle is stopped by a traffic light. It is determined whether or not (step S308).

Here, whether or not the vehicle is stopped by a traffic light is determined based on the current position detected by the sensor unit 31 and the map information (node data / link data) stored in the map storage unit (not shown), for example. It is possible to determine whether or not is near an intersection (intersection where a traffic light is installed).

It should be noted that, based on the center position coordinates (latitude / longitude) and the current position of the intersection included in the intersection information received by the communication unit 33 instead of the map information, whether or not the vehicle is stopped by a traffic light (the current position is an intersection (the traffic light is It is also possible to determine whether or not it is near the installed intersection).

In addition, it may be determined whether or not the vehicle is stopped by a traffic signal based on whether or not intersection information and traffic signal information are received. That is, even when the intersection information and the traffic signal information are received from the roadside device, it is considered that the vehicle is in the vicinity of the intersection (the intersection where the traffic signal is installed).

If it is determined that the vehicle is stopped by a traffic light, the process proceeds to step S309. If it is determined that the vehicle is not stopped by a traffic signal (for example, if the current position is not in the vicinity of an intersection (an intersection where a traffic signal is installed)), the process proceeds to step S304.

In step S309, the CPU 30 determines whether or not the stop time by the traffic light is a predetermined time or more (less than the predetermined time) (step S309).

Here, in order to determine whether or not the stop time by the traffic light is equal to or longer than a predetermined time (less than the predetermined time), it is necessary to specify a traffic light that regulates the traffic of the automobile on which the mobile broadcast receiving device 10 ′ is mounted. .

The traffic signal that regulates the traffic of the automobile on which the mobile broadcast receiving device 10 ′ is mounted is a traffic signal ahead of the traveling direction of the automobile, and can be specified based on the current position, traveling direction, intersection information, and traffic signal information. . Specifically, among the traffic lights installed at the intersection where the center position coordinate of the intersection is closest to the traveling direction from the current position, the traffic signal associated with the traveling direction of the own vehicle is “mobile broadcast receiving apparatus”. 10 ′ is specified as “a traffic light that regulates the traffic of a vehicle on which the vehicle is mounted”.

For example, if the direction of travel is north (the direction of travel is 0 ° when north is 0 °), it corresponds to the direction of travel (0 °) among traffic lights installed at the nearest intersection from the current position to the direction of travel. The traffic signal with the assigned traffic signal number is specified as the traffic signal that regulates the traffic of the automobile on which the mobile broadcast receiving device 10 ′ is mounted.

The current signal display information (information indicating the display color of the traffic signal) associated with the traffic signal number of the specified traffic signal, the next signal display information, information indicating the time until the next signal display is changed, etc. Based on this, the stop time by the traffic light is specified.

For example, if the current signal display of the traffic light is blue (travel permission signal display), it is assumed that movement (running) will start soon, so the stop time by the traffic light is 0 seconds.

On the other hand, if the current signal display of the traffic light is red (progress inhibition signal display), it is assumed that the movement (running) will not start until the red color becomes blue. The time required to change to the signal display (blue) is the stop time by the traffic light.

In addition, even when the current signal display of the traffic light is yellow (a progress warning signal display), it is assumed that the movement (running) does not start until the signal display turns blue as well. The signal time is the sum of the time from the current time until the next signal display (red) is changed and the time displayed in red (the time from the red color to the next signal display (blue)). It is preferable that the stop time is as follows.

In this embodiment, the traffic signal information includes the current signal display information (information indicating the display color of the traffic signal), the next signal display information, and the time until the next signal display is changed (from the present). An example is shown in which the information (in addition, information indicating the time until the next signal display is changed (from the current or next signal display)) is included. , Progression signal display (blue) is XX seconds, Progressive attention signal display (yellow) is XX seconds, Progression inhibition signal display (red) is XX seconds, or from XX hours to MIN Progression signal display (blue) until △ minute, progress warning signal display (yellow) from ○ hour △ minute to ○ hour □ minute, progress prohibition signal display (red) from ○ hour □ minute to ○ hour × minute Cycles may be included. Also in this case, it is possible to specify the time until the traffic signal is changed to the current signal display or the next signal display by referring to the current time.

And CPU30 compares the stop time by a traffic light with predetermined time (for example, 20 seconds), and determines whether the stop time by a traffic light is more than predetermined time (less than predetermined time) (step S309).

When the stop time by the traffic light is not less than the predetermined time (not less than the predetermined time) (step S309, YES), the process proceeds to step S310, and when the stop time by the traffic light is less than the predetermined time (step S309, NO), the process proceeds to step S304. move on.

In step S310, as in step S208 of FIG. 5, whether or not the low noise amplifiers LNAa to LNAd are set to ON (operating state) (whether or not to set OFF (non-operating state)) is determined. Determine for each LNAd, and set according to the determination result (operating state or non-operating state), or, for example, AGC level is large (threshold A or more) RF signal is more than half (for example, in this embodiment) It is determined whether or not the changeover switches 18a to 18d are collectively set to the operating state or the non-operating state according to whether or not three or more), and the setting (the operating state or the non-operating state) corresponding to the determination result is determined. Do.

In step S308, when it is determined that the vehicle is not stopped by a traffic light (for example, when the current position is not near an intersection (intersection where a traffic signal is installed)) and when the stop time by a traffic light is less than a predetermined time (step S309). , NO) will proceed to step S304, but this is not the stop by the traffic light or the stop time by the traffic light is less than the predetermined time, and therefore, if a little time has passed, the movement (running) is performed. This is because it is considered.

Then, the process proceeds to step S304, and when any AGC level of the RF signal is equal to or higher than the threshold A (YES in step S304), the CPU 30 switches the changeover switches 18a to 18d to the bypass lines 20a to 20d side, thereby reducing the low level. All of the noise amplifiers LNAa to LNAd are set to an OFF state (non-operating state) (step S305).

When all the AGC levels of the RF signal are equal to or lower than the threshold B (YES in step S306), the CPU 30 switches the changeover switches 18a to 18d to the low noise amplifiers LNAa to LNAd side, and all the low noise amplifiers LNAa to LNAd are connected. Is set to ON (operating state) (step S307).

Note that when the AGC levels of all the RF signals are smaller than the threshold value A (step S204, NO) (step S304, NO), and at least one of the AGC levels of the RF signals is larger than the threshold value B (step S206, NO). (Step S306, NO), all of the low noise amplifiers LNAa to LNAd are maintained in the current state. For example, if it is an operating state, the operating state is maintained.

As a result, the amplifier is not frequently turned on and off during traveling, and the broadcast can be viewed in a stable state. In addition, wasteful power consumption due to frequent switching can be suppressed, and power consumption can be saved, which can sufficiently contribute to power saving.
In addition, when the vehicle is not moving (when the vehicle is stopped), that is, when the change in the AGC level of the RF signal accompanying the movement is not desired, each RF signal is determined based on the AGC level of each RF signal. In order to determine whether to amplify each, it is possible to effectively use the RF signal that can be received at present, and furthermore, control during stopping (step S310 in FIG. 6) and control during traveling (step S304 in FIG. 6). To S307) can be prevented from being frequently performed.

As described above, according to the mobile broadcast receiving apparatus according to the second embodiment described above, the amplifier is not frequently turned on and off during traveling, and the broadcast can be viewed in a stable state. In addition, wasteful power consumption due to frequent switching can be suppressed, and power consumption can be saved, which can contribute to power saving sufficiently.

In the first and second embodiments, the setting unit is connected between each of the antennas and each of the amplifiers, and switches each of the broadcasting radio waves to be supplied to each of the amplifiers or to bypass each of the amplifiers. Consists of switches. This makes it possible to easily control connection / disconnection (on / off) of the amplifier.
[Other Embodiments]
In addition, this invention is not limited to Example 2 mentioned above, It can change in the range which does not deviate from the summary of this invention.

For example, in the second embodiment, detailed description of the communication unit 33 that receives the intersection information and the traffic signal information is omitted, but the communication unit 33 includes a plurality of antennas arranged at different positions of the automobile. Broadcast radio waves received by the antennas are supplied to the low noise amplifiers LNAa to LNAd (amplifiers) via the changeover switches (setting means) constituting the switch unit, or directly from the bypass line to the tuner unit (AGC circuit). ) May be supplied.

In this case, the present invention described above can also be applied to the communication unit 33. That is, the configuration of the communication unit 33 may be the antennas 14a to 14d, the switch unit 16, the switches 16a to 16d, the bypass lines 20a to 20d, and the tuner unit 22 (the tuner circuit 28 is unnecessary if there is one channel). . In this case, a roadside machine etc. can be considered as a broadcasting station.

Moreover, in the said Example 2, when determining whether the stop time by a traffic light is more than predetermined time, based on intersection information etc., the traffic signal which regulates the traffic of the motor vehicle in which mobile broadcast receiver 10 'is mounted However, when the communication unit 33 receives only single traffic signal information (signal traffic information of one traffic signal (or a plurality of traffic signals that perform the same lighting)), the stop by the traffic signal is based only on the traffic signal information. It is good also as specifying time.

In addition, when determining whether or not an automobile (an automobile on which the mobile broadcast receiving device 10 ′ is mounted) is running based on the output of the sensor unit 31, the mobile broadcast receiving device 10 ′ does not include the sensor unit 31. In addition, the output of the sensor unit 31 may be acquired via wireless or wired communication from the in-vehicle device provided in the automobile and provided with the sensor unit 31, or the in-vehicle device provided with the sensor unit 31 may output the sensor unit 31. It may be determined whether or not the automobile is traveling by determining whether or not the automobile is traveling and acquiring the determination result from the in-vehicle device via wireless or wired communication. (If the determination result from the in-vehicle device is traveling, it is determined that the vehicle is traveling.)

Furthermore, in the second embodiment, it is first determined whether “any AGC level is equal to or higher than the threshold A”. If none of them is equal to or higher than the threshold A, “whether all AGC levels are equal to or lower than the threshold B” is determined. However, first, it is determined whether or not all AGC levels are equal to or lower than threshold value B. If any of them is not equal to or lower than threshold value B, it is determined whether or not any AGC level is equal to or higher than threshold value A. May be.

DESCRIPTION OF SYMBOLS 10 ... Mobile broadcast receiver 10 '... Mobile broadcast receiver 12 ... Broadcast station 14a-14d ... Antenna 16 ... Switch part 16a-16d ... Switch part 18a-18d ..Switches 20a to 20d ... Bypass line 22 ... Tuners 24a to 24d ... AGC circuit 26 ... Signal synthesis circuit 28 ... Tuner circuit 30 ... CPU (arithmetic processing unit)
31 ... Sensor unit 32 ... Operation unit 33 ... Communication unit 34 ... ROM / RAM
36: Output unit 38: Output control unit

Claims

In a mobile broadcast receiver that is mounted on a mobile and receives broadcast radio waves transmitted from a broadcast station,
A plurality of antennas disposed at different positions of the mobile body and receiving the broadcast radio waves;
A plurality of amplifiers for amplifying the broadcast radio waves received by the antennas;
An arithmetic processing unit that functions as a detection unit that detects each signal level of each of the broadcast radio waves, and that functions as a determination unit that determines whether any of the signal levels is equal to or greater than a predetermined threshold;
When any one of the signal levels is determined to be equal to or higher than the predetermined threshold, setting means for setting all the amplifiers to a non-operating state in which the broadcast radio waves are not amplified,
A mobile broadcast receiving apparatus comprising:
The arithmetic processing unit further functions as stop determination means for determining whether or not the moving body is running based on the output of the sensor unit,
The setting means is a non-operating state in which all the amplifiers are not amplified when the mobile body is running and any of the signal levels is determined to be equal to or greater than the predetermined threshold. The mobile broadcast receiving apparatus according to claim 1, wherein
In a mobile broadcast receiver that is mounted on a mobile and receives broadcast radio waves transmitted from a broadcast station,
A plurality of antennas disposed at different positions of the mobile body and receiving the broadcast radio waves;
A plurality of amplifiers for amplifying the broadcast radio waves received by the antennas;
An arithmetic processing unit that functions as a detection unit that detects each signal level of each of the broadcast radio waves, and that functions as a determination unit that determines whether all the signal levels are equal to or less than a predetermined threshold;
When all the signal levels are determined to be equal to or less than the predetermined threshold value, setting means for setting all the amplifiers to an operating state for amplifying each of the broadcast radio waves,
A mobile broadcast receiving apparatus comprising:
The arithmetic processing unit further functions as stop determination means for determining whether or not the moving body is running based on the output of the sensor unit,
The setting means sets all the amplifiers to an operating state for amplifying each broadcast radio wave when it is determined that the moving body is running and all the signal levels are determined to be equal to or less than the predetermined threshold. The mobile broadcast receiving apparatus according to claim 3, wherein:
In a mobile broadcast receiver that is mounted on a mobile and receives broadcast radio waves transmitted from a broadcast station,
A plurality of antennas disposed at different positions of the mobile body and receiving the broadcast radio waves;
A plurality of amplifiers for amplifying the broadcast radio waves received by the antennas;
Functions as detection means for detecting each signal level of each of the broadcast radio waves, functions as first determination means for determining whether any of the signal levels is equal to or higher than a first threshold, An arithmetic processing unit that functions as second determination means for determining whether or not all are equal to or less than a second threshold value that is smaller than the first threshold value;
When it is determined that all the signal levels are lower than the first threshold and any one of the signal levels is higher than the second threshold, the operating states of all the amplifiers are maintained as they are. Setting means to set to,
A mobile broadcast receiving apparatus comprising:
The arithmetic processing unit further functions as stop determination means for determining whether or not the moving body is running based on the output of the sensor unit,
The setting means determines that the moving body is traveling, determines that all of the signal levels are smaller than the first threshold value, and any of the signal levels is higher than the second threshold value. 6. The mobile broadcast receiving apparatus according to claim 5, wherein the operation state of all the amplifiers is maintained as it is.
In a mobile broadcast receiver that is mounted on a mobile and receives broadcast radio waves transmitted from a broadcast station,
A plurality of antennas disposed at different positions of the mobile body and receiving the broadcast radio waves;
A plurality of amplifiers for amplifying the broadcast radio waves received by the antennas;
A communication unit that receives at least signal information; and
Functions as detection means for detecting each signal level of each of the broadcast radio waves, functions as determination means for determining whether any of the signal levels is equal to or higher than a predetermined threshold, and based on the output of the sensor unit Stop determination means for determining whether or not the moving body is traveling, and when not traveling, specifying a stop time based on the traffic signal information received by the communication unit and determining whether or not the stop time is less than a predetermined time An arithmetic processing unit that functions as:
When it is determined that the stop time is less than a predetermined time and any one of the signal levels is determined to be equal to or greater than the predetermined threshold, all the amplifiers are set to a non-operating state in which the broadcast radio waves are not amplified. Setting means to
A mobile broadcast receiving apparatus comprising:
In a mobile broadcast receiver that is mounted on a mobile and receives broadcast radio waves transmitted from a broadcast station,
A plurality of antennas disposed at different positions of the mobile body and receiving the broadcast radio waves;
A plurality of amplifiers for amplifying the broadcast radio waves received by the antennas;
A communication unit that receives at least signal information; and
Functions as detection means for detecting each signal level of each of the broadcast radio waves, functions as determination means for determining whether or not all the signal levels are equal to or less than a predetermined threshold, and moves based on the output of the sensor unit As stop determination means for determining whether or not the body is running and, when not running, specifying a stop time based on the traffic signal information received by the communication unit and determining whether or not the stop time is less than a predetermined time A functional processing unit;
Setting that sets all the amplifiers to an operating state for amplifying each broadcast radio wave when it is determined that the stop time is less than a predetermined time and all the signal levels are determined to be equal to or less than the predetermined threshold. Means,
A mobile broadcast receiving apparatus comprising:
The setting unit is connected between each antenna and each amplifier, and is configured by a changeover switch that supplies each broadcast radio wave to each amplifier or bypasses each amplifier. The mobile broadcast receiver according to any one of claims 1 to 8.