JP2011049946A - Broadcast signal converting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast signal converting apparatus attaining reduction in power consumption of a self-emission type monitor, speaker or the like even in a broadcast receiver which does not include a power consumption reduction function. <P>SOLUTION: The broadcast signal converting apparatus includes a switching section for switching signal passage/cutoff of a transmission line for transmitting a signal from a signal input section to a signal output section. The broadcast signal converting apparatus further includes: a connection section which connects a mobile detecting device for detecting a mobile; a mobile detector which receives a mobile detecting signal from the mobile detecting device; a switching control section for controlling the switching section so as to cut off a signal on the transmission line while the mobile detecting signal is not received; and a time measuring section for measuring the lapse of time from the change when a receiving status of the mobile detecting signal is changed. If it is detected by the time measuring section that the lapse of time exceeds a predetermined time, the switching control section controls the switching section so as to switch passage/cutoff of signal on the transmission line. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a broadcast signal conversion apparatus that receives a broadcast signal and performs conversion, and in particular, the broadcast signal conversion that can change the output state of the converted broadcast signal according to the state of a viewer who views the broadcast. Relates to the device.

  Today, television sets, radio devices, and the like are widely used as broadcast receivers that receive broadcast waves and output video and audio. Broadcasting includes CS (Communication Satellite) digital broadcasting using satellite, BS (Broadcast Satellite) digital / analog broadcasting, terrestrial digital / analog broadcasting, and the like.

  As for terrestrial television broadcasting, it has been decided that terrestrial analog broadcasting will be stopped in 2011 and shifted to digital broadcasting. Although digital broadcasting has been started since 2003, high-definition programs such as high-definition broadcasting can be broadcast. In addition to viewing the same simulcast program as terrestrial analog broadcast, interactive programs such as data broadcasting are also provided.

  Under such circumstances, efforts to reduce power consumption are being promoted for large broadcast receiving apparatuses such as televisions. For example, in order to reduce the power consumption of a TV, a power-saving TV that detects whether there is a viewer near the TV with an infrared sensor and automatically turns off the TV when it determines that there is no viewer Etc. have been put to practical use.

  In relation to the above, Patent Document 1 discloses a signal switching circuit capable of reducing the power consumption of an RF (Radio Frequency) modulator to 0 in a standby state of a video cassette deck. The signal switching circuit includes a first switch circuit that opens and closes a connection between the antenna input and the TV output, a second switch circuit that opens and closes a connection between the antenna input and the tuner output, and a connection between the modulator input and the TV output. And a third switch circuit for opening and closing.

  The first switch circuit is a circuit that closes the connection when power is not consumed, and the second switch circuit and the third switch circuit are circuits that open the connection when power is not consumed. For this reason, in a state where power is not consumed, the RF signal guided to the antenna input is transmitted to the television output without being attenuated. Thereby, the power consumption of the RF modulator in the standby state can be reduced to zero.

Japanese Patent Laid-Open No. 11-308536

  However, a user who owns a broadcast receiving apparatus that does not have the power consumption reduction function as described above needs to replace the broadcast receiving apparatus when attempting to use this function. For this reason, there has been a problem that a capital investment cost for replacement is generated.

  Further, in a store that sells broadcast receiving devices, for example, a situation where a plurality of broadcast receiving devices are displayed in an operating state, such as a television department, can be considered. In such a situation, it is normal that the power is always on even when there is no viewer. Accordingly, reduction of power consumption is required, but each broadcast receiving apparatus does not necessarily have a power consumption reduction function. Even if it is provided, the store clerk has to individually set the power consumption for each broadcast receiving apparatus, which is troublesome.

  The present invention has been made in view of the above problems, and is a broadcast signal conversion device used by being connected between an antenna and a broadcast receiving device, and is a self-luminous monitor or speaker of the broadcast receiving device. An object of the present invention is to provide a broadcast signal conversion device that can reduce the power consumed by the broadcast signal.

  In order to achieve the above object, a broadcast signal conversion apparatus according to the present invention includes a signal input unit that inputs a broadcast signal, a signal output unit that outputs a broadcast signal, and broadcasts from the signal input unit to the signal output unit. A switching unit that is provided on a transmission path for transmitting a signal and switches between passing / blocking of a broadcast signal in the transmission path, a connection unit that connects a mobile body detection device that detects a mobile body, and the mobile body detection device moves In a state in which the moving object detection signal indicating that the object has been detected is received from the moving object detection device using the connection unit, and the moving object detection signal is not received by the moving object detection signal And a switching control unit that controls the switching unit so as to block a broadcast signal in the transmission path.

  According to this configuration, the broadcast signal conversion apparatus of the present invention includes a signal input unit that inputs a signal and a signal output unit that outputs a signal. In addition, as a member provided on the transmission path for transmitting a signal from the signal input section to the signal output section, a switching section for switching between passing and blocking of the signal in the transmission path is provided. Moreover, the connecting part which connects the mobile body detection apparatus which detects a mobile body is provided. In addition, the mobile body detection device includes a mobile body detection unit that receives a mobile body detection signal. In addition, a switching control unit is provided that controls the switching unit so as to cut off the signal on the transmission line in a state where no moving body detection signal is received. Thereby, the reception state of the broadcast receiving apparatus connected to the signal output unit can be switched according to the detection state of the moving object.

  In order to achieve the above object, the broadcast signal conversion apparatus according to the present invention further includes a time measurement unit that measures an elapsed time after the change when the reception state of the mobile object detection signal by the mobile object detection unit changes. The switching control unit controls the switching unit to switch between passing / blocking the broadcast signal in the transmission path when the time measuring unit detects that the elapsed time exceeds a predetermined value. To do.

  According to this configuration, the broadcast signal conversion apparatus of the present invention includes the time measuring unit that measures the elapsed time after the change when the reception state of the moving body detection signal changes. In addition, the switching control unit controls the switching unit to switch between passing and blocking of the signal in the transmission path when the time measuring unit detects that the elapsed time exceeds the predetermined time. Thereby, in a situation where the detection state of the moving body frequently changes, it is possible to avoid occurrence of a switching process with low necessity.

  In order to achieve the above object, in the broadcast signal converter of the present invention, the signal input unit inputs an RF (Radio Frequency) signal from an antenna connected to the broadcast signal converter, and the signal output unit The RF signal is output to a broadcast receiving device connected to the broadcast signal conversion device, and the switching unit switches between passing / blocking of the RF signal in the transmission path, and the signal input unit is connected to the broadcast signal conversion device. An RF (Radio Frequency) signal is input from a connected antenna, the signal output unit outputs an RF signal to a broadcast receiving device connected to the broadcast signal conversion device, and the switching unit is an RF in the transmission path. Switch between passing and blocking signals.

  According to this configuration, the signal input unit inputs the RF signal from the antenna connected to the broadcast signal converter. The signal output unit outputs an RF signal to a broadcast receiving device connected to the broadcast signal conversion device. The switching unit switches between passing and blocking of the RF signal in the transmission path.

  In order to achieve the above object, the broadcast signal converter according to the present invention includes a demodulator that demodulates an RF signal input from the signal input unit to generate a video / audio signal, and modulates the video / audio signal. A modulation unit that generates an RF signal, a decoding process that generates video / audio data from the video / audio signal input from the demodulation unit, and a video / audio signal that is generated from the video / audio data to the modulation unit Video / audio data generated from a video / audio signal input from the demodulator in a state where the conversion unit for performing the encoding process to be output and the moving body detection signal is not received by the moving body detection unit are determined in advance. A conversion control unit that controls the conversion unit to convert the converted video / audio data, generate the video / audio signal from the converted video / audio data, and output the generated signal to the modulation unit.

  According to this configuration, the broadcast signal conversion apparatus of the present invention includes a demodulation unit that demodulates an RF signal input from a signal input unit to generate a video / audio signal. Also, a modulation unit that modulates the video / audio signal to generate an RF signal is provided. A conversion unit that performs a decoding process for generating video / audio data from the video / audio signal input from the demodulation unit and an encoding process for generating a video / audio signal from the video / audio data and outputting the video / audio signal to the modulation unit; Prepare. Further, in a state where the moving body detection signal is not received, the video / audio data is converted into predetermined video / audio data, and the video / audio signal is generated from the converted video / audio data and output to the modulation unit. A conversion control unit for controlling the conversion unit. Thereby, the video / audio data output to the broadcast receiving apparatus connected to the signal output unit can be changed according to the detection state of the moving object.

  In order to achieve the above object, the broadcast signal conversion apparatus according to the present invention is a video signal input from the demodulation unit when the conversion control unit is not accepting the moving body detection signal. The video signal / audio data generated from the audio signal is controlled to convert the video / audio data into a black image / silent video / audio data.

  According to this configuration, the conversion control unit controls the conversion unit to convert the video / audio data into the black image / silent video / audio data in a state where the moving body detection signal is not received. As a result, it is possible to display a black screen on the broadcast receiving apparatus connected to the signal output unit and to stop outputting audio.

  In order to achieve the above object, in the broadcast signal converting apparatus of the present invention, the converting unit converts a moving picture expert group TS (Transport Stream) packet from a video / audio signal input from the demodulating unit. And the conversion control unit converts the video / audio data included in the TS packet into black / silent video / audio data in a state where the moving body detection signal is not received by the mobile body detection unit. The conversion unit is controlled to do so.

  According to this configuration, the conversion unit acquires an MPEG TS packet from the video / audio signal input from the demodulation unit. In addition, the conversion control unit controls the conversion unit to convert the video / audio data included in the TS packet into black image / silent video / audio data in a state where the moving body detection signal is not received.

  In order to achieve the above object, the broadcast signal conversion apparatus according to the present invention further includes a time measurement unit that measures an elapsed time after the change when the reception state of the mobile object detection signal by the mobile object detection unit changes. The conversion control unit switches execution / non-execution of the conversion by the conversion unit when the time measurement unit detects that the elapsed time exceeds a predetermined value.

  According to this configuration, the broadcast signal conversion apparatus of the present invention includes the time measuring unit that measures the elapsed time after the change when the reception state of the moving object detection signal by the moving object detection unit changes. The conversion control unit switches execution / non-execution of conversion by the conversion unit when the time measurement unit detects that the elapsed time exceeds the predetermined time. As a result, it is possible to avoid occurrence of a conversion process with low necessity in a situation where the detection state of the moving body frequently changes.

  According to the present invention, when a moving body such as a viewer does not exist in the vicinity of the broadcast receiving apparatus, the RF signal for the broadcast receiving apparatus is set to no signal. Alternatively, the video signal and the audio signal are converted into a black image and silence and given to the broadcast receiving apparatus. As a result, the user can reduce power consumption without switching to a broadcast receiving device having a power consumption reduction function.

  In addition, according to the present invention, it is possible to collectively manage and reduce the power consumed by a plurality of broadcast receiving apparatuses in a facility that displays a plurality of broadcast receiving apparatuses in an operating state, for example, a store. is there. Further, it is not necessary to individually set the power consumption for each broadcast receiving apparatus, and the convenience can be improved.

It is a block diagram which shows the structure of the broadcast signal converter which concerns on 1st embodiment of this invention. It is a processing flow which shows the switching control process which concerns on 1st embodiment of this invention. It is a block diagram which shows the structure of the broadcast signal converter which concerns on 2nd embodiment of this invention. It is a schematic diagram which shows the data before conversion which concerns on 2nd embodiment of this invention. It is a schematic diagram which shows the data after conversion which concerns on 2nd embodiment of this invention. It is a processing flow which shows the data conversion process which concerns on 2nd embodiment of this invention.

An embodiment of the present invention will be described below with reference to the drawings. In addition, embodiment shown here is an example and this invention is not limited to embodiment shown here.
[Embodiment 1]
<1-1. Configuration of broadcast signal converter>

  FIG. 1 is a block diagram showing an internal configuration of a broadcast signal conversion apparatus 1 according to the first embodiment of the present invention. The broadcast signal converter 1 includes at least a system controller 10, a mute circuit 20 (= switching unit), an RF input terminal 31 (= signal input unit), an RF output terminal 32 (= signal output unit), and an external connection terminal 33 (= Connection portion).

  The system controller 10 controls the driving of each member of the broadcast signal conversion apparatus 1 so as to control the input / output processing of the RF signal, the conversion processing of the RF signal, and the like. The system controller 10 is composed of a plurality of microprocessors, for example.

  Further, the system controller 10 includes a moving body detection unit 11, a time measurement unit 12, and a switching control unit 13 as functional units realized by executing a predetermined program on the arithmetic processing device provided in the system controller 10. Yes. Details of each functional unit will be described later.

  The mute circuit 20 is a circuit for switching whether or not to output the RF signal input from the RF input terminal 31 to the RF output terminal 32. The mute circuit 20 switches the output state of the RF signal according to a control signal output from the system controller 10. The mute circuit 20 is composed of a plurality of transistors, for example.

  The RF input terminal 31 inputs an RF signal from the antenna 110. The RF output terminal 32 outputs the RF signal output from the mute circuit 20 to an external device, for example, the distributor 130. A plurality of digital televisions 141 (= broadcast receiving devices) and analog televisions 142 (= broadcast receiving devices) are connected to the distributor 130. The distributor 130 distributes and outputs the input RF signal to these television apparatuses.

  The external connection terminal 33 is an interface for connecting a device existing outside the broadcast signal conversion device 1. In the present embodiment, it is used to connect the infrared sensor 120 (= moving body detection device). The infrared sensor 120 is a detection device for detecting a moving body that exists in the vicinity of the digital television 141 and the analog television 142.

<1-2. About the configuration of the function section>
Here, the structure of the function part with which the broadcast signal converter 1 which concerns on 1st embodiment of this invention is provided is demonstrated. As illustrated in FIG. 1, the broadcast signal conversion apparatus 1 according to the present embodiment includes a moving body detection unit 11, a time measurement unit 12, and a switching unit as functional units realized by the system controller 10 executing a predetermined program. A control unit 13 is provided.

  The moving body detection unit 11 communicates with the infrared sensor 120 via the external connection terminal 33. And the input of a moving body detection signal is received from the infrared sensor 120. The moving body detection signal is output from the infrared sensor 120 when a moving body such as a TV viewer is detected by infrared rays.

  The time measuring unit 12 measures the elapsed time after the change when the state change of the moving body detection signal received by the moving body detection unit 11 occurs. Specifically, for example, measurement is started when a state in which a moving body detection signal is input (hereinafter referred to as “ON state”) is changed to a state in which it is not input (hereinafter referred to as “OFF state”). . Further, when the moving body detection signal is turned on, measurement is stopped.

  The switching control unit 13 starts giving a control signal to the mute circuit 20 when the moving body detection signal changes to the OFF state. Further, when the elapsed time measured by the time measuring unit 12 exceeds a predetermined time, the control signal is stopped from being supplied to the mute circuit 20. That is, when a predetermined time elapses after the change to the ON state, the application of the control signal to the mute circuit 20 is stopped.

While receiving the control signal, the mute circuit 20 switches the circuit so as to stop the output of the RF signal. When the control signal is not received in this state, the mute circuit 20 switches the circuit so as to start outputting the RF signal again.
<1-3. Switching control process>

  Here, the switching control process performed by the broadcast signal conversion apparatus 1 according to the first embodiment of the present invention will be described with reference to the flowchart of FIG.

  The processing flow shown in FIG. 2 can be started at an arbitrary timing in a state where the power source of the broadcast signal conversion apparatus 1 is driven. After the start of this process, the time measuring unit 12 resets and stops the timer for time measurement in step S110. For example, the timer may be configured by a physical circuit, or may be configured by a predetermined application.

  Next, in step S120, the moving body detection unit 11 determines whether or not the state of the moving body detection signal input from the infrared sensor 120 is the ON state. If it is determined that it is not in the ON state, the switching control unit 13 stops outputting the control signal to the mute circuit 20 in step S125. And it transfers to step S110 again.

  When it is determined that the state of the moving body detection signal is not the ON state, the moving body detection unit 11 detects in step S130 that the state of the input signal has changed from the ON state to the OFF state within the past predetermined time. It is determined whether it has been.

  If it has been detected, the time measuring unit 12 starts measuring the elapsed time by the timer in step S135, and then proceeds to step S140. If not detected, the process proceeds to step S140 as it is.

  Next, in step S140, the time measuring unit 12 determines whether or not a predetermined time, for example, five minutes has elapsed since the timer was started. If the predetermined time has not been exceeded, the process proceeds to step S120 again. If the predetermined time is exceeded, the switching control unit 13 starts outputting a control signal to the mute circuit 20 in step S150. And it transfers to step S120 again.

  The series of processes described above are continuously performed until the broadcast signal conversion apparatus 1 becomes inoperable, for example, when the power of the broadcast signal conversion apparatus 1 is stopped.

  According to the present embodiment described above, regardless of whether the broadcast wave is for digital broadcasting or analog broadcasting, the RF signal to the broadcast receiving device depends on whether or not there is a viewer in the vicinity of the broadcast receiving device. Output control can be performed. In addition, since the control signal is switched after a predetermined time has elapsed since the viewer was detected, efficient switching can be performed in situations where the viewer frequently moves.

  In addition, according to the present embodiment, when the broadcast receiving device connected to the broadcast signal converting device 1 is a digital output device such as a digital television, the RF signal becomes no signal, thereby displaying video and outputting audio. Since it is stopped, the power consumed by the self-luminous monitor and the speaker can be reduced.

Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, about the member similar to Embodiment 1, description shall be abbreviate | omitted by adding the same code | symbol.
[Embodiment 2]
<2-1. Configuration of broadcast signal converter>

  FIG. 3 is a block diagram showing an internal configuration of the broadcast signal conversion apparatus 1 according to the second embodiment of the present invention. The broadcast signal conversion apparatus 1 according to the present embodiment performs an RF signal conversion process for digital broadcasting. Therefore, instead of the mute circuit 20 of the first embodiment, a tuner / OFDM (Orthogonal frequency division multiplex) demodulator 41 (= demodulator), a TS (Transport Stream) decode / TS remultiplex processor 42 (= converter) , An OFDM / RF modulation section 43 (= modulation section), and a mixer 44.

  The tuner / OFDM demodulator 41 performs high frequency processing and demodulation of the RF signal input from the antenna 110. Broadcast signals of a plurality of channels obtained by demodulation are given to the TS decode / TS remultiplex processing unit 42. For example, in the example shown in FIG. 3, broadcast signals for 12 channels of ch1 to ch12 are demodulated. These channels indicate physical channels that can be received by channel scanning among UHF13ch to UHF62ch. In the present embodiment, a maximum of 12 physical channels can be registered in virtual channels ch1 to ch12.

  The TS decode / TS remultiplex processing unit 42 decodes TS packets from the broadcast signal of each channel. Then, a packet including MPEG data is detected from the TS packets. The TS decoding / TS remultiplexing processing unit 42 replaces data included in the video / audio packet and remultiplexes the TS based on an instruction from the conversion control unit 14 described later.

  The OFDM / RF modulation unit 43 receives the remultiplexed TS of each channel and remodulates it to the same frequency band. The mixer 44 mixes the modulation signal generated by the OFDM / RF modulation unit 43 to generate one RF signal.

<2-2. About the configuration of the function section>
Here, the structure of the function part with which the broadcast signal converter 1 which concerns on 2nd embodiment of this invention is provided is demonstrated. As shown in FIG. 3, the broadcast signal conversion apparatus 1 of the present embodiment includes a conversion control unit 14 instead of the switching control unit 13 of the first embodiment.

  The conversion control unit 14 stops giving the control signal to the TS decoding / TS remultiplexing processing unit 42 when the moving body detection signal changes to the ON state. Further, when the elapsed time measured by the time measuring unit 12 exceeds a predetermined time, the control signal is started to be given to the TS decode / TS remultiplex processing unit 42. That is, when a predetermined time elapses after changing to the OFF state, the control signal is started to be given to the TS decode / TS remultiplex processing unit 42.

  While receiving the control signal, the TS decode / TS remultiplex processing unit 42 replaces the data part of the video / audio packet with the non-picture and silent data. When no control signal is received in this state, the TS decode / TS remultiplex processing unit 42 performs normal TS decode / TS remultiplex processing.

Alternatively, when the control signal is not received, the TS decoding / TS remultiplexing processing unit 42 stops the processing and outputs the signal input from the tuner / OFDM demodulating unit 41 to the OFDM / RF modulating unit 43 as it is. But you can.
<2-3. About conversion control processing>

  Since it is the same content as Embodiment 1 except for a part, detailed description is abbreviate | omitted. The difference from FIG. 2 of the first embodiment is that, in the first embodiment, the switching control unit 13 gives a control signal to the mute circuit 20, but in this embodiment, the conversion control unit 14 uses the tuner / OFDM demodulation. A control signal is given to the unit 41. When a control signal is given, a data conversion process is performed. When the control signal is not given, the data conversion process is not performed. Details of the data conversion process will be described later.

<2-4. Data structure>
Here, the structure of the pre-conversion data and the post-conversion data of the data conversion process performed by the broadcast signal conversion apparatus 1 according to the second embodiment of the present invention will be described with reference to the schematic diagrams of FIGS. 4 and 5.

  FIG. 4 is a schematic diagram showing data before conversion, that is, the contents of a TS packet generated from a received RF signal. The numbers in parentheses in the figure indicate the patrol counter.

  In the TS input to the TS decode / TS remultiplex processing unit 42, video data, audio data, and other additional data are multiplexed in units of 188 bytes called TS packets. The TS decode / TS remultiplex processing unit 42 determines the type of the TS packet by referring to the PID (Packet ID = packet identifier) in the header information of the TS packet.

  TS packets include a packet for recording management information, such as PAT, and a packet for recording video data and audio data. The PID of the TS packet for video data (hereinafter referred to as “video packet”) and the TS packet for audio data (hereinafter referred to as “audio packet”) is not a fixed value but indirectly described in a PMT (Program Map Table). Has been.

  Further, the PID of the PMT is indirectly described in a PAT (Program Association Table). For this reason, in order to recognize the PID information of all video packets and all audio packets of the received TS, it is necessary to obtain PAT and PMT in advance.

  Based on the processing flow shown in FIG. 2, the conversion control unit 14 gives a control signal instructing conversion processing of video packets and audio packets to the TS decoding / TS remultiplexing processing unit 42. Receiving this control signal, the TS decode / TS remultiplex processing unit 42 reads out black and silent MPEG data stored in advance in a predetermined data area of a memory (not shown). Then, the content of the divided TS packet is replaced with the black image and silence data.

  As a result, the data structure of the TS packet is as shown in FIG. FIG. 5 is a schematic diagram showing the contents of the converted TS packet. In the example of FIG. 5, the video packet Video1 (1) of FIG. 4 is deleted, and a video packet Video1N (1) including black image data is inserted as a packet with PID = 0x0101 instead.

  Similarly, Audio1 (1) is deleted from the voice packet, and instead, a voice packet Audio1N (1) including silence data is inserted as a packet with PID = 0x0111.

Note that when the PID of the video packet or the audio packet is detected by the TS decode / TS remultiplex processing unit 42, a difference in data size occurs when data is exchanged. However, since the black picture and silent MPEG data usually have a smaller data size, a NULL packet is set in the surplus area at the time of replacement.
<2-5. Data conversion process>

  Here, data conversion processing performed by the broadcast signal conversion apparatus 1 according to the second embodiment of the present invention will be described with reference to the flowchart of FIG.

  The processing flow shown in FIG. 6 is started when transmission of a control signal from the conversion control unit 14 to the TS decode / TS remultiplex processing unit 42 is started in a state where the power of the broadcast signal conversion device 1 is driven. The Also, the transmission is terminated when transmission of the control signal is stopped.

  After the start of this processing, the conversion control unit 14 instructs the TS decoding / TS remultiplexing processing unit 42 to acquire the PAT included in the TS packet in step S210. In step S220, the process branches depending on whether the PAT has been successfully acquired.

  If acquisition of the PAT has failed, the process proceeds to step S210 again. If acquisition of the PAT is successful, the conversion control unit 14 instructs the TS decoding / TS remultiplexing processing unit 42 to acquire the PMT described in the PAT in step S230. In step S240, the process branches depending on whether or not the PMT has been successfully acquired.

  If acquisition of the PMT fails, the process proceeds to step S230 again. If acquisition of the PMT is successful, the conversion control unit 14 in step S250, the TS decode / TS remultiplex processing unit 42 acquires the PID described in the PMT, that is, the PID of the video packet and the PID of the audio packet. To instruct.

  Next, in step S260, the conversion control unit 14 determines whether the PID acquisition of the video packet has been successful. When it fails, it transfers to step S265 mentioned later. If successful, the conversion control unit 14 instructs the TS decoding / TS remultiplexing processing unit 42 to delete the acquired video packet of the PID in step S270.

  Next, in step S280, the conversion control unit 14 generates a video packet including black image data and having the same PID as the video packet deleted above. Then, after the generated video packet is inserted into the TS, the process proceeds to step S290.

  Returning to step S260, the description will be made. When the PID acquisition of the video packet fails in step S260, the conversion control unit 14 determines whether the PID acquisition of the voice packet is successful in step S265. When it fails, it transfers to step S290 mentioned later. If successful, the conversion control unit 14 instructs the TS decoding / TS remultiplexing processing unit 42 to delete the acquired voice packet of the PID in step S275.

  Next, in step S285, the conversion control unit 14 generates a voice packet including silent data and having the same PID as the voice packet deleted above. After the generated voice packet is inserted into the TS, the process proceeds to step S290.

  Next, in step S290, the conversion control unit 14 determines whether an update of the PAT included in the TS is detected. When the update of the PAT is detected, the process proceeds to step S210 again. If the update of the PAT is not detected, the conversion control unit 14 determines whether or not the update of the PMT included in the TS is detected in step S300.

  When the update of the PMT is detected, the process proceeds to step S230 again. If no update of the PMT is detected, the process proceeds to step S250, and the video packet or audio packet conversion process is continuously performed.

  According to the present embodiment described above, the video and audio output by the broadcast receiving device can be made black and silent depending on whether or not there is a viewer near the broadcast receiving device. Thereby, power consumption can be reduced compared with the case of displaying a normal video, that is, a video with a color tone, in a self-luminous television such as a plasma television or an organic EL.

Further, according to the present embodiment, since the broadcast receiving device connected to the broadcast signal converting device 1 is not in a no signal state, an error message such as “cannot be received” or a blue image for no signal is displayed. The bad effects such as being done can be avoided.
[Other embodiments]

  The present invention has been described with reference to the preferred embodiments and examples. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea. be able to.

  Therefore, the present invention can also be applied to the following embodiments.

  (A) In the above embodiment, various functional units related to the broadcast signal conversion processing of the present invention are realized by executing a predetermined program on an arithmetic processing unit such as a microprocessor. A form realized by this circuit may be used.

  (B) In the above-described embodiment, the RF signal transmitted by wire is described as an example of the signal input / output by the broadcast signal conversion apparatus 1. However, other signals may be input / output. For example, a form in which a wireless signal including video data and audio data is input / output may be used.

  (C) In the above embodiment, the mute circuit 20 has been described as an example of a member that switches between passing / blocking the output of the RF signal. However, the member may be switched using a member other than this. For example, the output state of the RF signal may be switched using a switching circuit that turns on / off the switch by a control signal from the system controller 10.

  (D) In the above embodiment, the infrared sensor 120 has been described as an example of a moving body detection device for detecting a TV viewer. However, a viewer may be detected using a device other than this. . For example, an illuminance sensor, an airflow sensor, a thermal sensor, or the like may be used. Further, these sensors may be included in the same housing as the broadcast signal conversion device 1.

  (E) In the second embodiment described above, an example in which data conversion is performed on an RF signal for digital broadcasting has been described. However, video data and audio data included in an RF signal for analog broadcasting are converted into a black image and silence. Form may be sufficient. In this case, an NTSC decoder and an NTSC encoder are provided after the RF input terminal 31. The input RF signal is decoded by an NTSC decoder, and the signal level of the generated video / audio signal is reduced to zero. Further, after the level-reduced video / audio signal is encoded by the NTSC encoder, it is output from the RF output terminal. As a result, when the output broadcast receiving apparatus is an analog apparatus such as an analog television, it is possible to avoid the occurrence of white noise or the like due to no signal.

  (F) In the above embodiment, the device configuration of the digital television 141 and the analog television 142 connected to the broadcast signal conversion device 1 is not particularly limited. For example, a CRT, a liquid crystal television, a plasma television, an organic EL television, or the like is used. It is possible. Moreover, the form which connects broadcast receiving apparatuses other than a television apparatus to the broadcast signal converter 1 may be sufficient. For example, a form in which a video deck, an HDD recorder, or the like is connected may be used.

  (G) In the above embodiment, when a mobile object such as a viewer is no longer detected, the TS decode / TS remultiplex processing unit 42 performs processing to include black image data in the video packet. Video data other than the above may be included in the video packet. For example, a character string video such as “Broadcast reception has been stopped” may be generated and included in the video packet.

DESCRIPTION OF SYMBOLS 1 Broadcast signal converter 10 System controller 11 Moving body detection part 12 Time measurement part 13 Switching control part 14 Conversion control part 20 Mute circuit (switching part)
31 RF input terminal (signal input section)
32 RF output terminal (signal output part)
33 External connection terminal (connection part)
41 Tuner / OFDM demodulator (demodulator)
42 TS decode / TS remultiplex processing unit (conversion unit)
43 OFDM / RF modulator (modulator)
44 Mixer 110 Antenna 120 Infrared sensor (moving body detection device)
141 Digital TV (broadcast receiver)
142 Analog TV (broadcast receiver)

Claims (7)

A signal input unit for inputting a broadcast signal;
A signal output unit for outputting a broadcast signal;
A switching unit that is provided on a transmission path that transmits a broadcast signal from the signal input unit to the signal output unit, and that switches passage / blocking of the broadcast signal in the transmission path;
A connection part for connecting a mobile object detection device for detecting a mobile object;
A moving body detection unit that receives a moving body detection signal indicating that the moving body is detected by the moving body detection device from the moving body detection device using the connection unit;
A broadcast signal conversion apparatus comprising: a switching control unit that controls the switching unit so as to block a broadcast signal in the transmission path in a state where the moving body detection signal is not received by the moving body detection unit. A time measuring unit that measures an elapsed time after the change when the reception state of the moving body detection signal by the moving body detection unit is changed;
The switching control unit controls the switching unit to switch the passage / blocking of the broadcast signal in the transmission path when the time measuring unit detects that the elapsed time exceeds a predetermined value. ,
The broadcast signal converter according to claim 1. The signal input unit inputs an RF (Radio Frequency) signal from an antenna connected to the broadcast signal converter,
The signal output unit outputs an RF signal to a broadcast receiver connected to the broadcast signal converter,
The switching unit switches between passing and blocking of the RF signal in the transmission path;
The broadcast signal converter according to claim 1. A demodulator that demodulates an RF signal input from the signal input unit to generate a video / audio signal;
A modulation unit that modulates a video / audio signal to generate an RF signal;
A conversion unit for performing decoding processing for generating video / audio data from the video / audio signal input from the demodulating unit, and encoding processing for generating a video / audio signal from the video / audio data and outputting it to the modulation unit;
In a state where the moving body detection signal is not received by the moving body detection unit, the video / audio data generated from the video / audio signal input from the demodulation unit is converted into predetermined video / audio data, and converted. A conversion control unit that controls the conversion unit to generate the video / audio signal from the subsequent video / audio data and output the generated video / audio signal to the modulation unit;
The broadcast signal converter according to claim 1. In the state where the moving body detection signal is not received by the moving body detection signal, the conversion control section converts the video / audio data generated from the video / audio signal input from the demodulation section to a black screen, a silent video / Controlling the conversion unit to convert to audio data;
The broadcast signal converter according to claim 4. The conversion unit obtains a TS (Transport Stream) packet of MPEG (Moving Picture Experts Group) system from the video / audio signal input from the demodulation unit,
The conversion control unit converts the video / audio data included in the TS packet into a black image / silent video / audio data in a state where the moving body detection signal is not received by the moving body detection unit. Control the part,
The broadcast signal converter according to claim 4. A time measuring unit that measures an elapsed time after the change when the reception state of the moving body detection signal by the moving body detection unit is changed;
The conversion control unit switches execution / non-execution of the conversion by the conversion unit when the time measurement unit detects that the elapsed time exceeds a predetermined value;
The broadcast signal converter according to claim 4.

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