JP2011091756A - Indoor television broadcast retransmitting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indoor television broadcast retransmitting apparatus, reducing power consumption, reducing influences to be exerted upon other domestic devices and satisfying a weak radio station condition. <P>SOLUTION: A receiver 30 operates only while superimposed power is supplied from a television receiver 41, generates an intermittent transmission request signal of a fixed cycle by a transmission request signal generating section 35, and transmits it to a transmitter 10. The transmitter 10 operates a broadcasting wave retransmitting section 12 by supplying power thereto only while the transmission request signal from the receiver 30 is received. The broadcasting wave retransmitting section 12 includes a high frequency amplifier 13 for amplifying a television broadcasting wave, adjusts a gain of the high frequency amplifier 13 so as to satisfy a weak radio station condition, and outputs a retransmitting wave from a retransmitting antenna 17. The receiver 30 receives the retransmitting wave from the transmitter 10 at a receiving antenna 31 and outputs it from a broadcasting wave output terminal 34 to the television receiver 41. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an indoor television broadcast retransmitting apparatus for retransmitting a television broadcast wave from a wall antenna terminal portion provided on a wall surface in a room to a television receiver installed in the room in a general home.

  In general households, in order to watch TV broadcasts, a wall surface antenna terminal provided on a wall surface in a room and a television receiver are connected by a coaxial cable. A TV broadcast wave received by a TV antenna installed outdoors is supplied to the wall antenna terminal by a coaxial cable.

  However, the method of connecting the wall antenna terminal and the television receiver with a coaxial cable in order to watch a television broadcast as described above has the drawback that the coaxial cable becomes an obstacle to the indoor layout and is unsightly. ing.

  In order to solve such a problem, an indoor television broadcast retransmitting apparatus that retransmits a television broadcast wave from the wall antenna terminal portion to the television receiver side using a radio wave has been proposed.

  The indoor television broadcast retransmitting device intended for home use is desired to be designed as a weak radio station facility that does not require a license because it is required to comply with the Radio Law. The indoor television broadcast re-transmission apparatus includes a transmitter / receiver and a transmitter / receiver antenna as its constituent elements. However, in a weak radio station, the electric field strength is 35 μV / m or less at a point 3 m from the transmission point, for example, by the radio wave method. Is limited to. For this reason, in the indoor television broadcast retransmitting device, it is necessary to devise such as reducing the gain of the transmitting antenna and increasing the gain of the receiving antenna.

  In addition, as a known technique related to the present invention, it is provided on a wall surface in a room in an area where CATV retransmits digital terrestrial television broadcasting because the level of on-air radio waves is low or the on-air radio waves do not reach. An amplification device having an AGC circuit is connected to a television terminal by a coaxial cable, and a signal amplified by the amplification device is retransmitted from a retransmission antenna to an indoor terrestrial digital television broadcast receiver, thereby enabling a portable television or the like indoors. There is known an indoor re-transmission device configured to be able to easily receive a television broadcast (for example, see Patent Document 1).

JP 2004-128719 A

  The conventional indoor television broadcast retransmitting apparatus always retransmits a television broadcast wave regardless of whether the television receiver is OFF. The retransmitted wave when the television receiver is OFF is unnecessary radiation, which increases power consumption and has a problem of adversely affecting other household devices.

  Moreover, the conventional indoor television broadcast retransmitting apparatus uses a general F-type connector as an input terminal, and can connect an amplifier (booster) having a commercially available F-type connector. Therefore, when an amplifier (booster) is connected between the wall antenna terminal and the indoor TV broadcast retransmitting device, the input signal level of the indoor TV broadcast retransmitting device increases, and as a result, the output level increases. It becomes violation of the Radio Law.

  The present invention has been made in order to solve the above-described problems, and can control ON / OFF of the output of the retransmitted wave in accordance with the ON / OFF operation of the television receiver, thereby reducing the power consumption and other households. The effect on the equipment can be reduced, and even if an excessive signal is input such as an amplifier (booster) connected to the input terminal, the retransmission output can be suppressed and the weak radio station conditions can be satisfied. An object of the present invention is to provide an indoor television broadcast retransmitting apparatus that can reliably prevent violations.

The present invention is arranged on a wall antenna terminal side provided in a room, and transmits a television broadcast wave supplied from the wall antenna terminal from a retransmission antenna to a television receiver side installed indoors. In an indoor television broadcast retransmitting device comprising a receiver that is arranged and receives a retransmitted wave transmitted from the transmitter with a receiving antenna and outputs the retransmitted wave to the television receiver,
The receiver includes means for operating by a power source supplied from the television receiver while the television receiver is operating, generating a transmission request signal, and wirelessly transmitting to the transmitter.
The transmitter receives a transmission request signal transmitted from the receiver, a broadcast wave retransmission unit that suppresses a signal level of a retransmission wave to a level that satisfies a weak radio station condition, and retransmits the transmission request. While receiving a signal, the broadcast wave retransmission unit is operated to output a retransmission wave, and when the transmission request signal from the receiver becomes unreceivable, the broadcast wave retransmission unit operates. And a retransmission control means for stopping.

  According to the present invention, when the power of the television receiver is turned off, the receiver and the transmitter are deactivated and the retransmission of the television broadcast wave is stopped, so that power consumption can be reduced. The influence on other household devices can be reduced. Even if the signal input becomes excessive by connecting an amplifier (booster) to the input terminal of the transmitter, the signal level can be adjusted to satisfy the weak radio station condition. In addition, since the operation of the receiver is matched with the ON / OFF of the television receiver, the operation of the indoor TV broadcast re-transmission device can be controlled by turning the television receiver ON / OFF, improving the convenience for the user. can do.

It is a block diagram which shows the structure of the indoor television broadcast re-transmission apparatus which concerns on Example 1 of this invention. It is a flowchart which shows the processing operation by the side of the transmitter of the indoor television broadcast re-transmission apparatus in the Example 1. FIG. It is a flowchart which shows the processing operation by the side of the receiver of the indoor television broadcast re-transmission apparatus in the Example 1. FIG. It is a figure which shows the transmission request timing from the receiver of the indoor television broadcast re-transmission apparatus in the Example 1 to a transmitter, the operation | movement of a transmission timer, and the operation state of a transmitter.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an indoor television broadcast retransmitting apparatus according to Embodiment 1 of the present invention.

  The indoor television broadcast retransmitting apparatus according to the first embodiment of the present invention includes a transmitter 10 disposed on the indoor wall surface antenna terminal 1 side and a receiver 30 disposed on the television receiver 41 side.

  The transmitter 10 includes a broadcast wave input terminal 11, a broadcast wave retransmission unit 12, a broadcast wave changeover switch 16, a retransmission antenna 17, a transmission request detection unit 20, a wireless reception unit 21, a retransmission control switch 22, and a power switch 23. It is composed mainly of.

  The power switch 23 is led out of the transmitter 10 by a power cord 24 and is connected to a commercial AC power supply (not shown) of 100 V, for example, through an adapter 25 and an outlet 26. The adapter 25 converts commercial AC power into a predetermined DC voltage, supplies an operating voltage to the transmission request detector 20 and the wireless receiver 21 via the power switch 23, and broadcasts via the retransmission control switch 22. An operating voltage is supplied to the wave retransmission unit 12. The wireless reception unit 21 receives a transmission request signal from the receiver 30 by wireless communication using, for example, infrared rays, ultrasonic waves, or ISM charging waves.

  The transmission request detection unit 20 has an initial operation mode and a normal operation mode. When the power switch 23 is turned on and power is supplied, the transmission request detection unit 20 performs an initial operation, and the broadcast wave changeover switch 16 is connected to the terminal b side (terminator 18). And the retransmission control switch 22 is turned on to supply operating power to the broadcast wave retransmission unit 12. When the transmission request detection unit 20 executes the initial operation and satisfies the weak radio station condition, the transmission request detection unit 20 shifts to the normal operation mode.

  The broadcast wave input terminal 11 of the transmitter 10 is connected via a coaxial cable 2 to a wall surface antenna terminal 1 provided on a wall surface in the room. Although not shown, the wall antenna terminal 1 is supplied with a television broadcast wave received by a television antenna installed outdoors or a television broadcast wave sent by a CATV system through a coaxial cable.

  The television broadcast wave input to the broadcast wave input terminal 11 is input to the broadcast wave retransmission unit 12. The broadcast wave retransmission unit 12 includes a high frequency amplifier 13 with gain control, a coupler 14 and a level detection unit 15. The high frequency amplifier 13 amplifies the television broadcast wave input to the broadcast wave input terminal 11 and outputs it to the broadcast wave changeover switch 16 via the coupler 14. The broadcast wave changeover switch 16 is switch-controlled by the transmission request detection unit 20 and includes switching contacts a and b and a common contact c. A signal output from the high-frequency amplifier 13 is connected to the coupler 14 at the common contact c. Is input via. The switching contact a of the broadcast wave changeover switch 16 is connected to the re-transmission antenna 17, and the switching contact b is grounded via the terminator 18. As the retransmission antenna 17, an antenna having a small gain is used.

  The coupler 14 of the broadcast wave retransmitting unit 12 branches a part of the signal amplified by the high frequency amplifier 13 and inputs it to the level detecting unit 15. The level detection unit 15 detects the signal branched by the coupler 14 to detect the signal level, outputs the detection signal to the transmission request detection unit 20, and sets the gain of the high-frequency amplifier 13 to an optimum value. That is, in the initial operation, the level detection unit 15 sets the gain of the high-frequency amplifier 13 to the maximum, and then determines whether or not the weak radio condition is satisfied by detecting the level of the signal branched by the coupler 14, If the weak radio condition is not satisfied, it is determined whether or not the gain adjustment of the high frequency amplifier 13 is possible. If the gain adjustment is possible, the gain of the high frequency amplifier 13 is sequentially reduced slightly and adjusted to satisfy the weak radio condition. . The determination result of whether the level detection unit 15 satisfies the weak radio condition and the determination result of whether the gain adjustment of the high-frequency amplifier 13 is possible are sent to the transmission request detection unit 20.

  Further, the wireless reception unit 21 receives a transmission request signal that is intermittently output from the receiver 30 at a constant period, and inputs the transmission request signal to the transmission request detection unit 20.

  In the initial operation of the transmission request detection unit 20, the transmission request detection unit 20 shifts to a normal operation when the signal output level of the high frequency amplifier 13 satisfies the weak radio station condition under the control of the level detection unit 15. If the level does not fall below the level that satisfies the weak radio station conditions even if the gain is lowered to the minimum adjustable gain, the retransmission control switch 22 is turned off to cut off the power supply to the broadcast wave retransmission unit 12 and alert (Alarm) is output.

  The transmission request detection unit 20 includes a transmission timer that operates when shifting from the initial operation to the normal operation. This transmission timer performs an increment operation with a clock pulse of a fixed period, and a limit value is set. When this limit value is exceeded, the retransmission control switch 22 is turned off and the broadcast wave changeover switch 16 is turned on the terminal b side ( Switch to the terminator 18 side) to stop transmission. The transmission timer is initialized every time a transmission request signal sent from the receiver 30 is received. The transmission request signal is intermittently output from the receiver 30 at a constant cycle, but the transmission timer limit value is set to a slightly longer cycle.

  The transmitter 10 sets the limit value of the transmission timer slightly longer than the cycle of the transmission request signal as described above, so that the broadcast wave changeover switch 16 is connected to the terminal while the transmission request signal is received from the receiver 30. Connect to the a side (retransmission antenna 17 side), and transmit a television broadcast wave from the retransmission antenna 17 permanently. The limit value of the transmission timer is set to several seconds, for example.

  On the other hand, the receiver 30 includes a receiving antenna 31, a changeover switch 32, an RF / DC separator 33, a broadcast wave output terminal 34, a transmission request signal generator 35, and a wireless transmitter 36.

  The reception antenna 31 has a sufficiently larger gain than the retransmission antenna 17 of the transmitter 10, receives a retransmission broadcast output from the transmitter 10, and includes a changeover switch 32 and an RF / DC separator 33. To the broadcast wave output terminal 34. The broadcast wave output terminal 34 is connected to a television receiver 41 installed indoors through a coaxial cable 42. The television receiver 41 superimposes and outputs the operating power (DC power supply) of the receiver 30 to the broadcast wave transmitted from the receiver 30. The DC power output from the receiver 30 is supplied to the broadcast wave output terminal 34 via the coaxial cable 42.

  The RF / DC separator 33 separates the DC power supplied to the broadcast wave output terminal 34 from the broadcast wave received by the receiving antenna 31 and supplies it as an operation power to the transmission request signal generator 35 and the wireless transmitter 36. At the same time, it is supplied to the changeover switch 32 as a changeover control signal. The changeover switch 32 is held in the OFF state when the changeover control signal is not supplied, and is turned on when the changeover control signal is supplied from the RF / DC separator 33 and received by the receiving antenna 31. Broadcast waves are output to the broadcast wave output terminal 34.

  The transmission request signal generation unit 35 intermittently generates a transmission request signal at a constant period when the direct current power separated by the RF / DC separator 33 is supplied, and outputs the transmission request signal to the wireless transmission unit 36. The cycle of the transmission request signal is set to a cycle slightly shorter than the limit value of the transmission timer provided in the transmission request detection unit 20 of the transmitter 10. When the direct-current power is supplied from the RF / DC separator 33, the wireless transmission unit 36 is in an operating state and transmits the transmission request signal generated by the transmission request signal generation unit 35 to the transmitter 10 side. The wireless transmitter 36 and the wireless receiver 21 provided in the transmitter 10 make a pair, and transmit and receive a transmission request signal by wireless communication using, for example, infrared rays, ultrasonic waves, or ISM charged waves.

  Next, the overall operation of the indoor television broadcast retransmission apparatus configured as described above will be described with reference to the flowcharts shown in FIGS. FIG. 2 is a flowchart showing the processing operation of the transmitter 10, and FIG. 3 is a flowchart showing the processing operation of the receiver 30.

  The indoor television broadcast retransmitting device has a transmitter 10 disposed near a wall antenna terminal 1 in a room where a television receiver 41 is installed, and a coaxial cable between the wall antenna terminal 1 and the broadcast wave input terminal 11. Connect by 2. In addition, the receiver 30 is arranged near the television receiver 41, and the broadcast wave output terminal 34 and the input terminal of the television receiver 41 are connected by a coaxial cable 42.

  And when operating the said indoor television broadcast re-transmission apparatus, the power switch 23 of the transmitter 10 is turned ON (step A1). When the power switch 23 is turned on, the DC power output from the adapter 25 is supplied to the transmission request detection unit 20 and the wireless reception unit 21. When the power is supplied from the adapter 25, the transmission request detection unit 20 enters the initial operation mode, switches the broadcast wave changeover switch 16 to the terminal b side (terminator 18 side), and stops the retransmission output from the retransmission antenna 17. At the same time, the retransmission control switch 22 is turned on (step A2), and operating power is supplied to the broadcast wave retransmission unit 12.

  The broadcast wave retransmitting unit 12 enters an operating state when the operating power is supplied, and first, the level detecting unit 15 sets the gain of the high frequency amplifier 13 to the maximum value (step A3). The high frequency amplifier 13 amplifies a television broadcast wave input from the wall surface antenna terminal 1 to the broadcast wave input terminal 11 via the coaxial cable 2. The television broadcast wave amplified by the high frequency amplifier 13 is supplied to the terminator 18 through the coupler 14 and the broadcast wave changeover switch 16.

  The coupler 14 branches a part of the television broadcast wave output from the high frequency amplifier 13 and inputs it to the level detector 15. The level detector 15 detects the signal branched by the coupler 14 to detect the signal level (step A4), and determines whether or not the weak radio station condition is satisfied from the signal level (step A5). When it is determined in step A5 that the weak radio station condition is not satisfied, the level detector 15 determines whether or not the gain of the high frequency amplifier 13 can be further adjusted (step A6). (Step A7), and then returns to step A4 to detect the level of the signal branched by the coupler 14.

  Thereafter, the same operation is repeated, and the gain of the high-frequency amplifier 13 is lowered stepwise until the weak radio station condition is satisfied. Even if the high-frequency amplifier 13 is lowered to the minimum adjustable gain, the weak radio station condition is not satisfied, and if the level detector 15 determines that the gain adjustment of the high-frequency amplifier 13 is impossible in step A6, the transmission request The detection unit 20 turns off the retransmission control switch 22 based on the determination result of the level detection unit 15, shuts off the operating power to the broadcast wave retransmission unit 12, and outputs an alert by, for example, an alarm or a warning light To inform the user (step A8).

  In Step A5, when it is determined that the weak radio station condition is satisfied by stepping down the gain of the high-frequency amplifier 13, the transmission request detection unit 20 performs an initial operation based on the determination result of the level detection unit 15. To the normal operation, the retransmission control switch 22 is turned off while the broadcast wave changeover switch 16 is kept switched to the terminal b side (terminator 18 side), and the operation power supply to the broadcast wave retransmission unit 12 is maintained. Is temporarily shut off (step A9).

  Next, the transmission request detection unit 20 detects the transmission request signal transmitted intermittently from the receiver 30 at a constant period based on the reception signal of the wireless reception unit 21, and determines the presence or absence of the transmission request signal (step A10, A11) If the transmission request signal has not been sent, the process returns to step A10 and the transmission request detection process is performed again. Thereafter, the transmission request detection unit 20 repeats the processes of steps A10 and A11 and waits until a transmission request signal is sent from the receiver 30. Since the operating power is not supplied while the power of the television receiver 41 is turned off, the receiver 30 is kept in a non-operating state. When the power of the television receiver 41 is turned on, the operating power is supplied and a transmission request is made. Send a signal.

  When the transmission request detection unit 20 detects that a transmission request signal has been sent from the receiver 30 in step A11, the transmission request detection unit 20 switches the broadcast wave changeover switch 16 to the terminal a side (retransmission antenna 17 side) and performs retransmission control. The switch 22 is turned on to supply operating power to the broadcast wave retransmission unit 12 (step A12). As a result, the broadcast wave retransmitting unit 12 operates to amplify the television broadcast wave input from the wall surface antenna terminal 1 to the broadcast wave input terminal 11 by the high frequency amplifier 13 and retransmit it via the coupler 14 and the broadcast wave changeover switch 16. Output to the antenna 17. As a result, a retransmitted wave is output from the retransmitting antenna 17 and sent to the television receiver 41 via the receiver 30. The television receiver 41 can watch a television broadcast by receiving the retransmitted wave output from the retransmission antenna 17 of the transmitter 10 via the receiver 30.

  The transmission request detector 20 switches the broadcast wave selector switch 16 to the terminal a side (retransmission antenna 17 side) and turns on the retransmission control switch 22 in step A12, and then resets the transmission timer (step A13). Then, the transmission request detection unit 20 determines whether or not the transmission timer is equal to or greater than the limit value (step A14), and if not equal to or greater than the limit value, counts up the transmission timer (step A15). Next, the transmission request detection unit 20 detects the transmission request signal from the receiver 30 and detects the presence or absence of the transmission request signal (steps A16 and A17). If no transmission request signal is sent from the receiver 30, the process returns to step A14 to determine whether or not the transmission timer is equal to or greater than the limit value, and if not greater than the limit value, the transmission timer is counted up (step A15). If it is determined in step A17 that a transmission request signal has been sent from the receiver 30, the process returns to step A13 to reset the transmission timer.

  Since the limit value of the transmission timer is set to be slightly longer than the cycle of the transmission request signal of the receiver 30, the transmission timer is set to the limit value while the transmission request signal of a constant cycle is sent from the receiver 30. It resets before reaching, and the retransmitted wave is transmitted permanently from the transmitter 10.

  However, if the transmission request signal from the receiver 30 is stopped and the count-up operation of the transmission timer is continued, and it is determined in step A14 that the transmission timer has reached the limit value, the process returns to step A9 and the broadcast wave switch 16 Is switched to the terminal b (terminator 18 side), and the retransmission control switch 22 is turned OFF to cut off the operating power of the broadcast wave retransmission unit 12. As a result, the broadcast wave retransmission operation from the broadcast wave retransmission unit 12 stops.

  FIG. 4 is a timing chart showing the transmission timing of the transmission request signal output from the receiver 30, the operation of the transmission timer, and the operating state of the transmitter 10. The receiver 30 intermittently outputs a transmission request signal having a constant period as shown in FIG. As shown in FIG. 4B, when the transmission request signal is transmitted from the receiver 30 at time t1, the transmission timer is reset and then starts a count-up operation. Similarly, the transmission timer is reset every time a transmission request signal is sent from the receiver 30 and starts a count-up operation. If the transmission request signal from the receiver 30 cannot be received, the transmission timer counts without being reset. When the up operation is continued and the limit value is reached at time t2, the retransmission control switch 22 is turned off and the broadcast wave retransmission unit 12 stops the retransmission operation. As shown in FIG. 4C, the broadcast wave retransmission unit 12 continuously outputs the retransmission wave from time t1 to time t2 when the transmission timer repeats the reset and count-up operations. When the limit value is reached at t2, the retransmission operation is stopped.

  Thereafter, when the receiver 30 starts the transmission operation of the transmission request signal at time t3, the transmission timer is reset as described above, and then the count-up operation is started, and the retransmission operation of the broadcast wave retransmission unit 12 is resumed. Is done.

  Next, the operation of the receiver 30 will be described with reference to the flowchart shown in FIG.

  The receiver 30 is in a standby state until operating power is supplied from the television receiver 41 (step B1). When operating power is supplied from the television receiver 41 to the broadcast wave output terminal 34, the operating power is supplied. Are separated by the RF / DC separator 33 and supplied to the transmission request signal generator 35 and the wireless transmitter 36 and to the changeover switch 32 as a change control signal. The changeover switch 32 is turned on when a changeover control signal is supplied from the RF / DC separator 33, and connects the receiving antenna 31 and the broadcast wave output terminal 34.

  When the direct-current power separated by the RF / DC separator 33 is supplied, the transmission request signal generator 35 intermittently generates a transmission request signal at a constant period as shown in FIG. It outputs to the part 36 (step B2). The wireless transmission unit 36 is in an operating state when DC power is supplied from the RF / DC separator 33 and transmits the transmission request signal generated by the transmission request signal generation unit 35 to the wireless reception unit 21 of the transmitter 10 ( Step B3). The receiver 30 determines whether or not the operation can be continued depending on whether or not the operation power is supplied from the television receiver 41 (step B4), and the transmission request signal generator 35 transmits the operation power while the operation power is supplied. A request signal is generated (step B2) and transmitted from the wireless transmitter 36 to the wireless receiver 21 of the transmitter 10 (step B3).

  In the transmitter 10, as described above, while the transmission request signal is transmitted from the receiver 30, the broadcast wave retransmitting unit 12 is in an operating state, and the TV input from the wall surface antenna terminal 1 to the broadcast wave input terminal 11 is set. The broadcast wave is amplified by the high frequency amplifier 13 and retransmitted from the retransmission antenna 17. The receiver 30 receives the retransmission wave output from the retransmission antenna 17 of the transmitter 10 by the reception antenna 31 and outputs it from the broadcast wave output terminal 34 via the retransmission control switch 22 and the RF / DC separator 33. To do. The retransmitted wave output from the broadcast wave output terminal 34 is sent to the television receiver 41 via the coaxial cable 42.

  By turning on the power of the television receiver 41 as described above, the indoor television broadcast re-transmission device is operated by the operating power output from the television receiver 41, and the television broadcast wave is re-transmitted to the television receiver 41. . Thereby, the television receiver 41 can view a television broadcast wave.

  When the power is turned off, the television receiver 41 shuts off the operating power supplied to the receiver 30. When the operating power from the television receiver 41 is cut off, the receiver 30 stops the transmission operation of the transmission request signal (step B5) and returns to the standby state of step B1.

  As shown in the above embodiment, the broadcast wave retransmission unit 12 of the transmitter 10 has an automatic gain adjustment function of the high frequency amplifier 13 and adjusts the output level of the retransmission wave so as to satisfy the weak radio station condition. Therefore, even when an excessive signal is input by connecting an amplifier (booster) to the input terminal, the weak radio station condition can be satisfied by adjusting the gain of the high-frequency amplifier 13. If the output signal does not fall below the predetermined level even when the high frequency amplifier 13 is lowered to the minimum adjustable gain, the retransmission control switch 22 is turned off to cut off the power supply to the broadcast wave retransmission unit 12. Since an alert is output, abnormal output of retransmitted waves can be prevented and the Radio Law can be observed.

  Further, the transmitter 10 operates the broadcast wave retransmission unit 12 only while receiving the transmission request signal from the receiver 30, and when the transmission of the transmission request signal is stopped, the broadcast wave retransmission unit 12 It can be made to stand by in a power saving state by shutting off the power supply. In addition, when there is a distance or failure where communication between the transmitter 10 and the receiver 30 is not possible, it is possible to stop transmission.

  Further, since the operating power of the receiver 30 is supplied by the superimposed power from the television receiver 41, the ON / OFF operation of the receiver 30 and the transmitter 10 should be matched with the ON / OFF of the television receiver 41. Can do. Therefore, by operating the television receiver 41 to be turned on / off, the operation of the indoor television broadcast re-transmission device can be turned on / off, and user convenience can be improved.

  In addition, when the power of the television receiver 41 is turned off, the receiver 30 and the transmitter 10 are also in an inoperative state, and retransmission of the television broadcast wave is stopped. The impact on home devices can be reduced.

  In addition, when the gain of the retransmission antenna 17 is small and the gain of the reception antenna 31 is set large, if the retransmission antenna 17 and the reception antenna 31 are erroneously connected in reverse, the transmitter 10 transmits a retransmission wave larger than a specified value. However, in the first embodiment, the transmitter 10 includes the retransmission antenna 17 and the receiver 30 includes the reception antenna 31. There is no risk of connecting the antenna 31 in reverse, and the violation of the Radio Law can be prevented in advance. Even when the retransmission antenna 17 and the reception antenna 31 are configured to be externally connected, dedicated connectors are used for the retransmission antenna 17 and the reception antenna 31, respectively. By making the receiving antenna 31 connectable only to the receiver 30, it is possible to prevent the occurrence of violation of the Radio Law due to incorrect antenna connection.

  The receiver 30 can connect the broadcast wave output terminal 34 to the wall surface antenna terminal 1 using a coaxial cable. However, even when such a misconnection is made, the receiver antenna 31 and the broadcast wave output terminal 34 are connected. By using the changeover switch 32 provided between the two, a television broadcast wave can be prevented from being retransmitted from the receiving antenna 31. That is, when the broadcast wave output terminal 34 of the receiver 30 is connected to the wall surface antenna terminal 1 by the coaxial cable, the operation power is not supplied to the broadcast wave output terminal 34, so that the changeover switch 32 is held in the OFF state. . Therefore, the television broadcast wave output from the wall surface antenna terminal 1 is not supplied to the reception antenna 31, and the television broadcast wave can be prevented from being retransmitted from the reception antenna 31. In addition, when a terminal having a structure in which a general F-type connector cannot be connected is used as the broadcast wave output terminal 34 of the receiver 30, and the broadcast wave output terminal 34 cannot be connected to the wall surface antenna terminal 1, the switching is particularly performed. The switch 32 may not be provided.

  In the above embodiment, the case where the broadcast wave retransmission unit 12 is provided with the high frequency amplifier 13 to amplify the television broadcast wave has been described, but a signal level adjusting means such as an attenuator may be provided instead of the high frequency amplifier 13. Good.

  In the above embodiment, the case where an intermittent transmission request signal with a fixed period is output from the receiver 30 has been described. However, while the operation power is supplied from the television receiver 41, the transmission request signal having a continuous waveform. May be output. In this case, the transmitter 10 operates the broadcast wave retransmission unit 12 by turning on the retransmission control switch 22 under the control of the transmission request detection unit 20 while receiving the transmission request signal transmitted from the receiver 30. When power is supplied and the transmission of the transmission request signal is stopped, the retransmission control switch 22 is turned off to stop the operation of the broadcast wave retransmission unit 12. When the transmission request signal has a continuous waveform as described above, it is possible to control the retransmission control switch 22 and the broadcast wave changeover switch 16 without providing a transmission timer in the broadcast wave retransmission unit 12.

  Further, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

  DESCRIPTION OF SYMBOLS 1 ... Wall antenna terminal, 2 ... Coaxial cable, 10 ... Transmitter, 11 ... Broadcast wave input terminal, 12 ... Broadcast wave re-transmission part, 13 ... High frequency amplifier with gain control, 14 ... Coupler, 15 ... Level detection part, 16 DESCRIPTION OF SYMBOLS ... Broadcast wave changeover switch, 17 ... Retransmission antenna, 18 ... Terminator, 20 ... Transmission request detection part, 21 ... Radio reception part, 22 ... Retransmission control switch, 23 ... Power switch, 24 ... Power cord, 25 ... Adapter , 26 ... outlet, 30 ... receiver, 31 ... reception antenna, 32 ... changeover switch, 33 ... RF / DC separator, 34 ... broadcast wave output terminal, 35 ... transmission request signal generator, 36 ... wireless transmission part, 41 ... TV receiver, 42 ... Coaxial cable.

Claims (1)

The transmitter is disposed on the wall antenna terminal side provided in the room, retransmits the television broadcast wave supplied from the wall antenna terminal from the retransmission antenna, and is disposed on the television receiver side installed in the room, In an indoor television broadcast retransmitting device comprising a receiver that receives a retransmitted wave transmitted from a transmitter with a receiving antenna and outputs the retransmitted wave to the television receiver,
The receiver includes means for operating by a power source supplied from the television receiver while the television receiver is operating, generating a transmission request signal, and wirelessly transmitting to the transmitter.
The transmitter receives a transmission request signal transmitted from the receiver, a broadcast wave retransmission unit that suppresses a signal level of a retransmission wave to a level that satisfies a weak radio station condition, and retransmits the transmission request. While receiving a signal, the broadcast wave retransmission unit is operated to output a retransmission wave, and when the transmission request signal from the receiver becomes unreceivable, the broadcast wave retransmission unit operates. An indoor television broadcast retransmission apparatus comprising: a retransmission control means for stopping.

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