JP2010141626A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent useless power consumption of a digital broadcast receiver by powering off the digital broadcast receiver not only in the state where a program is not viewed on a video display although the program is broadcast on the video display, but also in the state where a user does not view the program or the state where a video image displayed on the video display is different from a video image output to the video display by the digital broadcast receiver. <P>SOLUTION: A digital broadcast receiver includes: a video output terminal for outputting a video signal to the video display; a video input terminal for inputting a video signal to be displayed on the video display; a waveform comparator circuit for comparing the video signal output from the video output terminal with the video signal input to the video input terminal; and a controller for powering off the digital broadcast receiver. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiver that receives a digital broadcast, and more particularly to a digital broadcast receiver that can prevent wasteful power consumption.

  When the digital broadcast receiver is configured with a so-called digital set-top box (digital STB) that does not include a display unit such as a liquid crystal display (LCD), the program is broadcast but the program cannot be viewed If the condition continues, the elapsed time after the state in which the program cannot be displayed on the display unit is counted, and the digital broadcast receiver is turned off after the lapse of a predetermined time to prevent unnecessary power consumption. (For example, refer to Patent Document 1).

FIG. 6 is a block diagram showing a configuration of a conventional digital broadcast receiver 10. In this figure, the CPU 14 detects that a program is being broadcast but has made it impossible to display the program on a video display device (not shown). Count the elapsed time. The CPU 14 controls the power supply control unit 16 so as to turn off the power supply of the digital broadcast receiver 10 after a predetermined time has elapsed. The state in which display is impossible is a case where the program is not contracted or a case where viewing is impossible due to age restrictions.
Japanese Patent Laid-Open No. 2001-128080

  However, the conventional digital broadcast receiver is in a state other than the state in which the program is broadcasted but the program cannot be viewed, for example, the video displayed on the video display device and the video output by the digital broadcast receiver. However, in a different state, it was impossible to turn off the digital broadcast receiver.

    In order to solve the above problem, the digital broadcast receiver of the present invention includes a video output terminal that outputs a video signal to a video display device, a video input terminal that inputs a video signal displayed on the video display device, A waveform comparison circuit that compares the video signal output from the video output terminal with the video signal input to the video input terminal, and a control for turning off the power of the digital broadcast receiver based on the comparison result of the waveform comparison circuit A section.

  According to the digital broadcast receiver of the present invention configured as described above, although the program is being broadcast, not only the program cannot be viewed on the video display device but also the program is not viewed on the video display device. The digital broadcast receiver can be turned off even when the status or the video displayed on the video display device is different from the video output from the digital broadcast receiver to the video display device. Power consumption can be prevented.

(Embodiment 1)
FIG. 1 is a block diagram showing an example of the overall configuration of a digital broadcast receiving system 901 according to the present invention.

  The digital broadcast receiver 801 includes a system LSI 101, a video output terminal 201, a video input terminal 202, a waveform comparison circuit 301, a microcomputer 401, a power supply unit 501, and a switch unit 601.

  The system LSI 101 performs processing such as D / A conversion and video format conversion on a digital video signal included in a digital broadcast (here, a digital broadcast distributed from a CATV station) received by the digital broadcast receiver 801. The analog video signal is output to the video output terminal 201. The analog video signal output from the system LSI 101 is output via the video output terminal 201 to the waveform comparison circuit 301 and the video display device 701 connected to the video output terminal 201 via an AV cable. The digital signal that the system LSI 101 performs processing such as D / A conversion and video format conversion, and the analog signal output from the digital broadcast receiver 801 to the video display device 701 are not limited to a digital video signal or an analog video signal. An analog audio signal and the like are also included, but the description thereof is omitted here. The video display device 701 is equipped with a terrestrial digital tuner or a BS tuner, and is different from the digital broadcast distributed from the CATV station input via the digital broadcast receiver 801 (here, terrestrial digital broadcast is used). ) Can be received. The user can select and enjoy a favorite digital broadcast of either a digital broadcast distributed from a CATV station input to the video display device 701 or a digital terrestrial broadcast. The digital video signal displayed on the video display device 701 is output to the video input terminal 202 connected to the video display device 701 with an AV cable. The analog video signal input to the video input terminal 202 is output to the waveform comparison circuit 301.

  The waveform comparison circuit 301 compares the analog video signal output from the video output terminal 201 with the analog video signal output from the video input terminal 202 at regular intervals. For example, when a user is watching a digital broadcast distributed from a CATV station on the video display device 701 via the digital broadcast receiver 801 while the digital broadcast receiver 801 and the video display device 701 are turned on. The analog video signal output from the video output terminal 201 and the analog video signal output from the video input terminal 202 are determined to be the same. On the other hand, when viewing the terrestrial digital broadcast on the video display device 701, it is determined that the analog video signal output from the video output terminal 201 is different from the analog video signal output from the video input terminal 202. When the user turns off only the video display device 701 and forgets to turn off the digital broadcast receiver 801, the signal input to the waveform comparison circuit 301 is only the analog video signal output from the video output terminal 201. Thus, it is determined that the analog video signal output from the video output terminal 201 and the analog video signal output from the video input terminal 202 are different. The waveform circuit 301 passes the comparison result to the microcomputer 401. The microcomputer 401 controls the cutoff of the power supplied from the power supply unit 501 to the system LSI 101 via the switch unit 601 based on the comparison result received from the waveform comparison circuit 301.

  FIG. 2 is a block diagram showing an example of a specific configuration of the waveform comparison circuit 301 in the digital broadcast receiver 801 of FIG.

  The waveform comparison circuit 301 shown in FIG. 2 includes a first effective value voltmeter 311, a second effective value voltmeter 312, a first AD converter 321, and a second AD converter 322. In addition, the same code | symbol is attached | subjected to the thing of the structure same as FIG.

  The first effective value voltmeter 311 converts the effective value of the analog video signal output from the video output terminal 201 and the second effective value voltmeter 312 from the video input terminal 202, respectively, into an analog voltage. The first AD converter 321 converts the analog voltage output from the first effective voltmeter 311 and the second AD converter 322 from the second effective value voltmeter 312 to a digital value, respectively, and the microcomputer 401 Output to. The microcomputer 401 monitors the digital values output from the first AD converter 321 and the second AD converter 322 a predetermined number of times at regular intervals, and the first AD converter 321 and the second AD converter are monitored. If it is determined that the digital values output from 322 differ by a predetermined number of times or more, a signal for shutting off the power supplied from the power supply unit 501 to the system LSI 101 is output to the switch unit 601.

  FIG. 3 is a flowchart showing the power-off process of the digital broadcast receiver 801 by the microcomputer 401 in FIG.

  It starts from a state in which the power of the digital broadcast receiver 801 is turned on.

  The microcomputer 401 sets 0 to n indicating the number of comparisons between the digital value output from the first AD converter 321 and the digital value output from the second AD converter 322 (S101). Next, the microcomputer 401 obtains a digital value from the first AD converter 321 (S102). Next, the microcomputer 401 obtains a digital value from the second AD converter 322 (S103). Thereafter, the microcomputer 401 compares the digital value obtained from the first AD converter 321 with the digital value obtained from the second AD converter 322 (S104). The microcomputer 401 sets n + 1 to n indicating the number of times of comparing the digital value obtained from the first AD converter 321 and the digital value obtained from the second AD converter 322 (S105). S102 to A105 are repeated until the number of comparisons set in advance within the time is exceeded (S106). The microcomputer 401 presets the number of times that the digital value obtained from the first AD converter 321 and the digital value obtained from the second AD converter 322 are different from the preset number of comparisons. When the number of times is greater than or equal to the number of times (S107), a signal for shutting off the power supplied from the power supply unit 501 to the system LSI 101 is output to the switch means 601 (S108), and the power of the digital broadcast receiver 801 is turned off (S109).

  Note that the time from when the microcomputer 401 outputs a signal for shutting off the power supplied from the power supply unit 501 to the system LSI 101 to the switch unit 601 and before turning off the power of the digital broadcast receiver 801 is, for example, as shown in FIG. It is also possible to display a menu on the video display device 701 and allow the user to select in advance such as 3 minutes, 5 minutes, or none.

  As described above, according to the digital broadcast receiver of the present invention, although the program is being broadcast, not only the program cannot be viewed on the video display device but also the user is not viewing the program on the video display device. The digital broadcast receiver can be turned off even when the status or the video displayed on the video display device is different from the video output from the digital broadcast receiver to the video display device. Power consumption can be prevented.

(Embodiment 2)
In the present embodiment, the block diagram shown in FIG. 5 uses an audio output terminal 211 and an audio input terminal 212 instead of the video output terminal 201 and the video input terminal 202 of the digital broadcast receiver 801 shown in FIG. The same effects as those of the first embodiment are obtained.

  As described above, according to the digital broadcast receiver of the present invention, although the program is being broadcast, not only the program cannot be viewed on the video display device but also the user is not viewing the program on the video display device. The digital broadcast receiver can be turned off even when the status or the video displayed on the video display device is different from the video output from the digital broadcast receiver to the video display device. Power consumption can be prevented.

  In the first embodiment and the second embodiment, the case where the digital broadcast receiver is configured as a so-called two-body type that does not include a video display device has been described. The present invention can also be applied to a case where the receiver includes a video display device.

  The digital broadcast receiver according to the present invention is not only in a state in which a program is being broadcast, but not in a state where the program cannot be viewed on the video display device, or in a state where the user is not viewing the program on the video display device. Since the digital broadcast receiver can be turned off even when the video displayed on the digital broadcast receiver and the video output from the digital broadcast receiver to the video display device are different, wasteful power consumption can be prevented. Useful in.

1 is a block diagram showing an example of the overall configuration of a digital broadcast receiver system according to Embodiment 1 of the present invention. The block diagram which shows an example of the concrete structure of the waveform comparison circuit in the digital broadcast receiver in Embodiment 1 of this invention The flowchart which shows the power shutdown process of the digital broadcast receiver by the microcomputer in Embodiment 1 of this invention The figure which shows an example of the display on the video display apparatus in Embodiment 1 of this invention Block diagram showing an example of the overall configuration of a digital broadcast receiver system in Embodiment 2 of the present invention Block diagram showing the configuration of a conventional digital broadcast receiving system

Explanation of symbols

101 System LSI
DESCRIPTION OF SYMBOLS 201 Video output terminal 202 Video input terminal 211 Audio | voice output terminal 212 Audio | voice input terminal 301 Waveform comparison circuit 311 1st effective value voltmeter 312 2nd effective value voltmeter 321 1st AD converter 322 2nd AD converter 401 Microcomputer 501 Power supply unit 601 Switch means 701 Video display device 801 Digital broadcast receiver 901 Digital broadcast reception system

Claims (6)

A video output terminal for outputting a video signal to a video display device;
A video input terminal for inputting a video signal displayed on the video display device;
A waveform comparison circuit that compares a video signal output from the video output terminal and a video signal input to the video input terminal;
Based on the comparison result of the waveform comparison circuit, a control unit for turning off the power of the digital broadcast receiver;
A digital broadcast receiver comprising: The controller is
The digital broadcast receiver according to claim 1, wherein when the video signal output from the video output terminal is different from the video signal input to the video input terminal, the digital broadcast receiver is turned off. . The waveform comparison circuit includes an effective value voltmeter for measuring a voltage of a video signal output from the video output terminal and a video signal input to the video input terminal;
An A / D converter that converts a voltage measured by the effective value voltmeter into a digital signal;
The digital broadcast receiver according to claim 1, further comprising: An audio output terminal for outputting an audio signal to the video display device;
An audio input terminal for inputting an audio signal output from the video display device;
A waveform comparison circuit that compares an audio signal output from the audio output terminal with an audio signal input to the audio input terminal;
Based on the comparison result of the waveform comparison circuit, a control unit for turning off the power of the digital broadcast receiver;
A digital broadcast receiver comprising: The controller is
5. The digital broadcast receiver according to claim 4, wherein when the audio signal output from the audio output terminal is different from the audio signal input to the audio input terminal, the power of the digital broadcast receiver is turned off. . The waveform comparison circuit includes an effective value voltmeter for measuring a voltage of an audio signal output from the audio output terminal and an audio signal input to the audio input terminal;
An A / D converter that converts a voltage measured by the effective value voltmeter into a digital signal;
The digital broadcast receiver according to claim 4 or 5, further comprising:

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