JP2006339743A - Diversity receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diversity receiver capable of informing a user that a removal antenna is to be mounted when a reception state is deteriorated and changing a reception mode into a diversity reception mode when the reception state is furthermore deteriorated after the removable antenna is mounted. <P>SOLUTION: The receiver is provided with: a discrimination means that discriminates whether or not the removable antenna is mounted when a deteriorated reception state is discriminated in the case that a single reception mode is selected for the reception mode; a means that selects the diversity reception mode for generating received data from both of a signal received by a permanently installed antenna and a signal received by the removable antenna when the removable antenna is mounted; and a notifying means that informs the user that the removable antenna is to be mounted when no mount of the removable antenna is discriminated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a diversity receiver.

  As a diversity receiver with two antennas, one antenna is a permanent antenna (including an electric telescopic antenna that is automatically extended when the power is turned on), but the other antenna is a detachable type like an earphone antenna. It may be an antenna. In addition, as a diversity receiver having two antennas, one antenna is a permanent antenna, but the other antenna may be a manually extendable antenna that can be manually expanded and contracted.

  When the detachable antenna is not attached when the power is turned on (or when the manual extension antenna is not extended), the reception mode is a single reception mode for receiving broadcast waves using only one normal antenna. It is said. When the reception state is good, the single reception mode is sufficient. However, when the reception state deteriorates, it is preferable to switch the reception mode to the diversity reception mode for receiving broadcast waves with two antennas. However, when the detachable antenna is not attached (manual extension antenna) Diversity is not received).

  According to the present invention, in a diversity receiver having a permanent antenna and a detachable antenna, when the detachable antenna is not attached and the reception mode is set to the single reception mode, the reception situation is deteriorated. Sometimes it is possible to notify the user that a detachable antenna should be mounted, and the reception mode can be changed to the diversity reception mode if the reception situation deteriorates after the detachable antenna is mounted. An object is to provide a diversity receiver.

  Further, the present invention provides a diversity receiver having a permanent antenna and a manually extendable antenna that can be manually expanded and contracted, when the manually extendable antenna is not extended and the reception mode is the single reception mode. When the reception situation deteriorates, the user can be informed that the manual extension antenna should be extended, and when the reception situation deteriorates after the manual extension antenna is extended, the reception mode is diversity reception. An object of the present invention is to provide a diversity receiver that can be put into a mode.

  In the diversity receiver having a permanent antenna and a detachable antenna, the invention according to claim 1 is an antenna detection means for detecting whether or not the detachable antenna is mounted, and when the power is turned on. Means for setting the reception mode to a single reception mode for generating reception data only from a signal received by a permanent antenna; first determination means for monitoring the reception state and determining whether the reception state is good or bad; In the single reception mode, when the first determination means determines that the reception state is poor, the first determination means determines whether or not the detachable antenna is attached based on the detection signal from the antenna detection means. 2 When the discriminating means and the second discriminating means discriminate that the detachable antenna is mounted, the reception mode is set to the permanent mode. A means for switching to a diversity reception mode for generating reception data from both a signal received by the tenor and a signal received by the detachable antenna, and the second determination means determined that the detachable antenna is not mounted. In such a case, it is characterized in that a notification means for notifying the user so as to attach a detachable antenna is provided.

  According to a second aspect of the present invention, in the first aspect of the invention, when the reception mode is the diversity reception mode and the first determination means determines that the reception state is good, the reception mode is set to a single reception mode. Means is provided for switching to the reception mode.

  According to a third aspect of the present invention, there is provided a diversity receiver including a permanent antenna and a manually extendable antenna. Antenna detecting means for detecting whether or not the manually extendable antenna is extended; Means for setting the reception mode to a single reception mode for generating reception data only from a signal received by a permanent antenna; first determination means for monitoring the reception state and determining whether the reception state is good or bad; In the single reception mode, when it is determined by the first determination means that the reception state is bad, it is determined whether or not the manually extendable antenna is extended based on the detection signal from the antenna detection means. 2) When the discriminating means and the second discriminating means determine that the manually extendable antenna is extended, the reception mode is always set. A means for switching to a diversity reception mode for generating received data from both a signal received by the antenna and a signal received by the manual telescopic antenna, and the second discriminating means discriminating that the manual telescopic antenna is not extended In this case, it is characterized in that a notification means for notifying the user to extend the manual extendable antenna is provided.

  According to a fourth aspect of the present invention, in the third aspect of the invention, when the reception mode is the diversity reception mode and the first determination unit determines that the reception state is good, the reception mode is set to a single mode. Means is provided for switching to the reception mode.

  According to the present invention, in a diversity receiver including a permanent antenna and a detachable antenna, when the detachable antenna is not attached and the reception mode is set to the single reception mode, the reception condition is poor. If the reception status becomes worse after the detachable antenna is attached, the reception mode should be changed to the diversity reception mode. Will be able to.

  Further, according to the present invention, in a diversity receiver including a permanent antenna and a telescopic antenna that can be manually expanded and contracted, when the telescopic antenna is not stretched and the reception mode is set to the single reception mode. When the reception situation deteriorates, the user can be notified that the extension antenna should be extended, and when the reception situation becomes worse after the extension antenna is extended, the reception mode is changed to the diversity reception mode. To be able to.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows the electrical configuration of the diversity receiver.

  The antenna 1 is a permanent antenna (including an electric telescopic antenna that is automatically extended when the power is turned on), and the antenna 2 is a detachable antenna such as an earphone antenna. The antennas 1 and 2 convert radio waves in the air into electric signals and supply them to the antenna receiving circuits 3 and 4 at the subsequent stages, respectively.

  Each of the antenna receiving circuits 3 and 4 amplifies the weak electric signal from the antennas 1 and 2 into an electric signal having a constant amplitude so that the signal processing can be easily performed by the common receiving circuit 5 at the subsequent stage, and also transmits the RF signal transmitted in space The signal is converted into a baseband signal (BB signal) before being modulated into an intermediate frequency signal (IF signal) or an RF signal. The tuner unit 10 is configured by the antenna receiving circuits 3 and 4 and the common receiving circuit 5, but the antenna receiving circuits 3 and 4 are generally analog circuits in order to obtain good characteristics free from noise and distortion. It is necessary to use a certain amount of power. For this reason, the power consumption of the antenna reception circuits 3 and 4 often occupies most of the power consumption of the entire tuner unit 10.

  The signals amplified and frequency-converted by the antenna receiving circuits 3 and 4 are input to the common receiving circuit 5. The common receiving circuit 5 performs demodulation processing for returning the input signal to the original signal desired to be transmitted, such as television video / audio and radio audio, and the obtained signal is passed to the CPU 6 as received data. . In the case of analog broadcasting, received data is often passed directly from the common receiving circuit 5 to the presentation unit 7 and the recording circuit 8, but in the case of digital broadcasting, the CPU 6 further cancels encryption of the digital signal, After the compression processing is decrypted, the received data is transferred to the presentation unit 7 and the recording circuit 8. The presentation unit 7 presents video and audio via a monitor and a speaker according to a signal from the CPU 6. An operation unit 9 is connected to the CPU 6.

  The common reception circuit 5 includes a reception status detection unit 5a that detects information on a reception state obtained when demodulating signals from the antenna reception circuits 3 and 4. Information on the reception state detected by the reception state detection unit 5a is read by the CPU 6 through a tuner control signal. The information on the reception state includes the level of the AGC signal that changes according to the signal state from the antenna, the bit error rate (BER) obtained by performing error correction at the time of demodulation, the number of misalignments (desired signal and noise signal) (Signal equivalent to the ratio (C / N)).

  The common receiving circuit 5 can also control the power supply of the antenna receiving circuits 3 and 4 through a tuner control signal from the CPU 6.

  The antenna detection unit 11 detects whether or not the detachable antenna 2 is attached, and notifies the CPU 6 of the detected state by an antenna detection signal. The regulator circuit 13 generates a power source for each unit based on the power supplied from the battery 12.

  The CPU 6 monitors the information on the reception state. Basically, when the reception state is good, the reception mode is set to a single reception mode for generating reception data from a signal received only by the antenna 1, and the reception state is If it is bad, the reception mode is set to a diversity reception mode for generating reception data from signals received by the antennas 1 and 2. However, when the detachable antenna 2 is not attached, since reception in the diversity reception mode is not possible, when shifting to the diversity reception mode, it is determined whether or not the detachable antenna 2 is attached, When it is attached, the user shifts to the diversity reception mode, and when it is not attached, the user is informed to attach the detachable antenna 2 without shifting to the diversity reception mode.

  The CPU 6 controls the power supply of the antenna reception circuit 4 via the common reception circuit 5 according to the reception mode. That is, the power of the antenna receiving circuit 4 is controlled so that the power of the antenna receiving circuit 4 is turned off in the single receiving mode, and the power of the antenna receiving circuit 4 is turned on in the diversity receiving mode. Control the power supply. The power supply of the antenna reception circuit 3 is controlled so as to be turned on in both the single reception mode and the diversity reception mode.

  FIG. 2 shows the procedure of the reception mode switching process by the CPU 6.

  When the power is turned on, it is determined whether or not the detachable antenna 2 is attached based on the antenna detection signal from the antenna detection unit 11 (step S1). If the detachable antenna 2 is not attached, the reception mode is set to the single reception mode (step S2). Therefore, reception data is generated based only on the signal received by the antenna 1. In this case, power is supplied to the antenna receiving circuit 3, but no power is supplied to the antenna receiving circuit 4.

  After waiting for a predetermined time (for example, 0.5 seconds to 1 second) (step S3), information on the reception state detected by the reception state detection unit 5a in the common reception circuit 5 is read (step S4). Then, it is determined whether the reception state is good or bad (step S5). For example, if the level of the AGC signal is greater than a predetermined threshold, it is determined that the reception state is bad. Alternatively, if the bit error rate (BER) is larger than a predetermined threshold, it is determined that the reception state is bad. Alternatively, if the number of misalignment is larger than a predetermined threshold, it is determined that the reception state is bad.

  If it is determined that the reception state is good, the process returns to step S3. If it is determined that the reception state is bad, it is determined whether or not the detachable antenna 2 is attached based on the antenna detection signal from the antenna detection unit 11 (step S6).

  If it is determined in step S6 that a detachable antenna is attached, the reception mode is switched to the diversity reception mode (step S8). In this case, power is also supplied to the antenna reception circuit 4 and reception data is generated based on the signals received by the antennas 1 and 2. Then, the process proceeds to step S9.

  If it is determined in step S6 that the detachable antenna 2 is not attached, the user is notified to attach the detachable antenna 2 (step S7). Specifically, a message for instructing the user to attach the detachable antenna 2 via the presentation unit 7 is displayed, or a warning sound is output. Then, the process returns to step S3.

  In step S9, it waits for a predetermined time (for example, 0.5 seconds to 1 second). Then, information on the reception state detected by the reception state detection unit 5a in the common reception circuit 5 is read (step S10). Then, it is determined whether the reception state is good or bad (step S11). This process is the same as step S5.

  If it is determined that the reception state is poor, the count value CNT of the counter is set to 0 (step S12), and the process returns to step S9. If it is determined that the reception state is good, the counter count value CNT is incremented by 1 (CNT = CNT + 1) (step S13), and then the counter count value CNT has reached a predetermined value K (for example, 10). It is determined whether or not (step S14).

  If the count value CNT is less than the predetermined value K, the process returns to step S9. When the count value CNT is equal to or greater than the predetermined value K, that is, when it is determined that the reception state is good continuously K times, the reception mode is switched to the single reception mode (step S15). Then, the process returns to step S3.

  If it is determined in step S1 that the detachable antenna 2 is attached, the reception mode is set to the diversity reception mode (step S16). Then, the process proceeds to step S9.

  The present invention can also be applied to a case where a manual extension type antenna is used instead of the detachable antenna 2. In this case, the antenna detection unit 11 detects whether or not the manually extendable antenna 2 is extended, and notifies the CPU 6 of the detected state by an antenna detection signal. In step S6, based on the antenna detection signal from the antenna detection unit 11, it is determined whether or not the manually extendable antenna 2 is extended. If it is determined that the manually extendable antenna 2 is extended, the reception mode is switched to the diversity reception mode (corresponding to step S8). If it is determined that the manual extendable antenna 2 is not extended, the user is notified to extend the manual extendable antenna 2 (corresponding to step S7).

It is a block diagram which shows the electric constitution of a diversity receiver. It is a flowchart which shows the procedure of the reception mode switching process by CPU6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Permanent antenna 2 Detachable antenna 3, 4 Antenna receiving circuit 5 Common receiving circuit 10 Tuner part 5a Reception condition detection part 6 CPU
7 Presentation unit 8 Recording circuit 9 Operation unit 11 Antenna detection unit

Claims (4)

In a diversity receiver with a permanent antenna and a detachable antenna,
An antenna detection means for detecting whether or not a detachable antenna is mounted;
Means for setting the reception mode to a single reception mode for generating reception data only from a signal received by a permanent antenna when the power is turned on;
First determination means for monitoring the reception state and determining whether the reception state is good or bad;
When the reception mode is the single reception mode and the first determination unit determines that the reception state is bad, it is determined whether or not the detachable antenna is mounted based on the detection signal from the antenna detection unit. Second discriminating means,
If the second discriminating means discriminates that the detachable antenna is mounted, the reception mode is generated from both the signal received by the permanent antenna and the signal received by the detachable antenna. A means for switching to a diversity reception mode, and a notification means for informing the user to attach a detachable antenna when the second determination means determines that the detachable antenna is not attached,
A diversity receiver characterized by comprising: 2. The apparatus according to claim 1, further comprising means for switching the reception mode to the single reception mode when the reception mode is the diversity reception mode and the first determination means determines that the reception state is good. The described diversity receiver. In a diversity receiver with a permanent antenna and a manual telescopic antenna,
An antenna detection means for detecting whether or not the manually extendable antenna is extended;
Means for setting the reception mode to a single reception mode for generating reception data only from a signal received by a permanent antenna when the power is turned on;
First determination means for monitoring the reception state and determining whether the reception state is good or bad;
When the reception mode is the single reception mode and the first determination means determines that the reception state is bad, it is determined whether or not the manually extendable antenna is extended based on the detection signal from the antenna detection means. Second discriminating means,
If the second discriminating means discriminates that the manually extendable antenna is extended, the reception mode is generated from both the signal received by the permanent antenna and the signal received by the manual extendable antenna. A means for switching to a diversity reception mode, and a notification means for informing the user to extend the manual extendable antenna when the second determiner determines that the manually extendable antenna is not extended,
A diversity receiver characterized by comprising: 4. The apparatus according to claim 3, further comprising means for switching the reception mode to the single reception mode when the reception mode is the diversity reception mode and the first determination means determines that the reception state is good. The described diversity receiver.

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