JPS59204387A - Automatic power source disconnecting device for tv - Google Patents

Abstract

PURPOSE:To prevent a TV receiver from being left on by turning off a power switch automatically after detecting a call sign from a broadcasting station and then confirming that it indicates the ending of program broadcasting. CONSTITUTION:The video signal of a TV signal received by a TV tuner 13 is demodulated 14 to project an image on the screen of a CRT15. Its sound signal is demodulated 16 to drive a speaker 17. Then, the video and sound signals are sent partially from the tuner 13 to a signal converter 18. Those signal is compared 21 with information stored in a memory 20. Consequently, when it is decided that a broadcasted signal is the call sign of a broadcasting station and indicates the ending of program broadcasting, a control part 19 turns off the switch 12 automatically to turn off the power source 11.

Description

[Detailed Description of the Invention] This invention detects a call sign broadcast broadcast by a broadcast station,
This invention relates to an automatic power-off device for a TV that automatically turns off the power after confirming that the power is at the end of a program.

Conventionally, there have been devices of this type that automatically turn off the power using, for example, a time switch. This is shown in Figure 1. In FIG. 1, 1 is a power supply, 2 is a time switch, and 3 is a TV receiver.

Next, the operation will be explained. Power supply 1 and TV receiver 30
Insert time switch 2 in between.

The user sets the time switch 2 to the broadcast end time in advance. When the time switch 2 reaches the set time, the connection between the TV receiver 3 and the power source 1 is turned off.

Since the conventional TV power switching system is configured as described above, the user has to set the time switch 2 in advance, and when the user falls asleep, etc., the TV reception can be switched off. There was a drawback that machine 3 was left unused.

This invention was made to eliminate the drawbacks of the conventional methods as mentioned above.
After detecting the test pattern or the broadcast end screen of each broadcast station and confirming that it is the end of the program, it automatically turns off the power switch and falls asleep. To provide an automatic TV power cut-off device capable of turning off the power of an FCT TV receiver at the end of broadcasting even if a child plays a trick and turns off the TV receiver.

Embodiments of the automatic power cut-off device for TV according to the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of one embodiment. In FIG. 2, a power supply 11 supplies power to a TV tuner 13 through a switch 12.

The switch 12 is, for example, a solenoid or the like.
A device that can be automatically turned off is used.

The output of the TV tuner 13 is passed through the video demodulation circuit 14.
It is added to the cathode ray tube 15 so that an image is projected on the cathode ray tube 15, and an audio signal is demodulated through an audio demodulation circuit 16, and a speaker 17 is driven with this audio signal.

Further, a video synchronization signal and an audio signal are sent from the TV tuner 13 to a signal converter 18. A control signal from a control section 19 is input to this signal converter 18 .

The control unit 19 uses, for example, a microcomputer, and its program is incorporated to operate in accordance with a flowchart showing the operations described below.

This control section 19 includes a switch 12, a memory 2
A control signal is sent to the switch 12, and power is supplied to the output side of the switch 12.

Further, specific pattern information for memory is written from the signal converter 18 to the memory 20, and an output is sent from the signal converter 18 to the comparator 21. The contents of the memory 20 are also transferred to the comparator 21, and the contents of the memory 20 and the output of the signal converter 18 are compared by the comparator 21, and the result of the comparison is sent to the control section 19. It is designed to output to .

The detailed structure of the signal converter 18 is shown in FIG.

In FIG. 3, the video synchronization signal or the audio signal from the TV tuner 13 is input to the frequency separation circuit 18a. The audio signal is sent to a sampling hold circuit 18e through an audio demodulation circuit 18b.

Further, the video synchronization signal is sent to the amplitude separation circuit 18d,
Therefore, the video signal and synchronization signal were separated)
Of these, the separated video signal is sent to a sampling and holding circuit 18c. The synchronization signal is then sent to the frequency separation circuit 18e.

This frequency separation circuit 18e separates the synchronization signal into a vertical synchronization signal and a horizontal synchronization signal, and sends the vertical synchronization signal and the horizontal synchronization signal to pulse generators 18f and 18g, respectively.

When the pulse generator 18f receives the vertical synchronizing signal, it generates a start trigger pulse and sends it to the sampling and holding circuit 18e, causing the sampling and holding circuit 18c to perform a K start operation.

- When the pulse generator 18g receives a horizontal synchronizing signal, it generates a reset trigger pulse and sends it to the sampling and holding circuit 18c to reset the sampling and holding circuit 18c.

Furthermore, the output of the pulse generator 18g is 180° phase shifter 1
8h, this 18, O0 phase shifter 18h shifts the output of the pulse generator 18g by 18σ, generates a reset trigger signal, and sets the sampling hold circuit 18c. It is supposed to be done.

The output of the sampling hold circuit 18c is sent to an A/D converter 181 and converted into a digital signal.

That is, the video signal output of the TV tuner 13 is converted into digital data by a signal converter, and compared with the broadcast end data stored in advance in the memory 20 by the comparator 21. If the two match, the comparison result is The control part 1
The control section 19 performs 0 or more operations and controls, such as inputting the signal to the input signal 9 and turning off the switch 12.

Next, the operation of the TV automatic power cut-off device of the present invention constructed as described above will be described with reference to the flowcharts shown in FIG. 4 and subsequent figures.

First, in FIG. 2, during reception by the TV receiver, the appetizer 11 supplies power to the TV tuner 3 and other parts through the switch 12, and among the TV signals received by the TV tuner 13, the video signal is The signal is sent to the video demodulation circuit 14, where it is demodulated, and supplied to the cathode ray tube 15, where the image is displayed on the screen of the cathode ray tube 15.

At the same time, the audio signal is demodulated by the audio demodulation circuit 16 and drives the speaker 17. Tsumashi step 401
At step 402, a video synchronization signal and an audio signal are sent from the TV tuner 13 to the signal converter 18. First, check to see if the signal being broadcast is the call sign of that station.

Next, in step 403, if the call sign is broadcast, the process advances to step 404; if the call sign is not broadcast, the process returns to step 402.

In the case of a call sign broadcast, in step 404, it is checked whether the call sign broadcast is for the end of the program;
If the call sign broadcast is for the end of the program, in step 405 the control section 19 sends a control signal to the switch 12, and in step 406 the power supply 11 is cut off.

Further, in step 405, if the call sign broadcast is not for the end of the program, the process returns from step 405 to step 402.

In this way, when the call sign broadcast is the end of the program, the control unit 19 automatically turns off the switch 12 and shuts off the power.

Next, according to the flowchart in Figure 5, the end of the broadcast is detected and judged by whether or not a video signal exists after that, and if the test broadcast continues, the test pattern used by it is detected. The operation when making a determination will be explained. One point is that the pattern of morning and night is determined.

In this FIG. 5, it is checked in step 501 whether the signal being broadcast is the call sign broadcast of the broadcast station, and in step 502, the process returns from step 503 to step 502 and the call sign is broadcast. For broadcasting, step 503 to step 50
Proceed to step 4.

In this step 504, after the broadcast ends, it is checked whether or not there are received radio waves. If the received radio waves are low, the process proceeds from step 505 to step 506, and the control unit
In response to the control signal from 9, the switch 12 is turned off to cut off the power supply 11.

If there is a received radio wave in this step 504, the process goes from step 504 to step 505, and in step 507, it is checked whether the broadcast signal is a test pattern.If it is not a test pattern, step 50
8, the process returns to step 502; in the case of a test turn, the process proceeds from step 508 to step 506) In response to a control signal from the control section 19, the switch 12 is turned off and the power source 11 is cut off.

In the flowchart of FIG. 5, step 5
The flowchart in FIG. 6 shows the case where the call sign broadcast detection operation in 03 is compared in terms of time.

In this FIG. 6, the signal converter 18 detects the receiving channel in step 601, and specifies the call sign broadcasting information of the channel from the signal converter 18. The pattern information is read from the memory 20, and in step 603, the video signal information read from the memory 20 is input to the comparator 21.

Next, in step 604, the frequency separation circuit 18e
Detects the vertical synchronization signal of the video signal, sends this vertical synchronization signal to the pulse generator 18f, generates a pulse there, and starts the sampling hold circuit 18e by the pulse output from the pulse generator 18f. trigger.

In this case, the sampling and hold circuit 18C performs sampling 74s from the amplitude separation circuit 18d + hold circuit 18e.
The video signal input to the A/
The signal is sent to the D converter 18i, and the A/D converted output is sent to the comparator 21.

The comparator 21 compares the video signal A/D converted by the A/D converter 21 with the first frame information read from the memory 20. Of that comparison! Control part 1
9, a determination is made in step 605.

If the comparison result by the comparator 21 does not match, the process returns from step 605 to step 603, and if the comparison result matches, the process moves from step 605 to step 606.

In this step 606, the control unit 19 sends a control signal to the signal converter 18, i.e., the information of the second frame of the memory 20 is called up in step 607 in the same manner as in the case of calling the information of the first frame.
It will be carried out at

In this step 607, the information of the next frame of the video signal to be compared by the comparator 21 (in this case, the video signal of the n-2 frame) and the information of the n-th frame called out from the memory 20 (in this case, the same -2 frame information).

The comparison result of this comparator 21 is sent to the control unit 19, and if it is determined that the comparison result does not match, step 6o7;
In step 609, the control unit 19 determines whether the above-mentioned n-th (n-2) frame is the last information read from the memory 2o.

If the result of this judgment is not the last video information, the process moves from step 609 to step 610, and the control unit 1
9, set n+1 (z +1 in the case of Jin) to a new n
(return to step 607), the control unit 19 sends a control signal to the memory 2o and the comparator 21), and the signal converter 18 converts this n+1 into a new n+1.
The specific pattern information for the memory is sent to the memory 21, and the video information with this n+1 as a new n is called from the memory 21, and the comparator 21 performs the same comparison operation as described above.

Further, in step 609, if the nth frame is the last video information retrieved from the memory 2o,
The process moves from step 609 to step 611, where the call sign broadcast detection output is output.Next, the detection operation using a still image such as a test pattern will be described with reference to the flowchart of FIG. In FIG. 7, in step 701, the control unit 19 calls up information on all test patterns stored in the memory 20, and in step 702, a video signal to be compared is input to the comparator 21.

Next, in step 703, the control section 19 sets 7 frames to m-1, and in step 704, a vertical synchronizing signal is applied to the pulse generator 18f, and a start trigger signal is output to start the sampling and holding circuit 18c. , the video signal (or audio signal) information of the first frame of the m-th test pattern is sent from the signal converter 18 to the comparator 21, and in step 704, the comparator 21 combines the output of this signal converter 18 and the memory 20. Compare with the test pattern called from.

The result of this comparison is sent to the control unit 19 in step 705.
If the test pattern matches the information of the video signal (or audio signal) output from the signal converter 18, the process moves from step 705 to step 706, and in step 706 n-2 is determined. do.

Further, in step 705, if the above information and the test pattern almost match, the process moves from step 705 to step 708, and the m-th test pattern is stored in the memory 2.
The controller 19 determines whether or not o is the last one. If it is not the last one, in step 714), m+1 is set as a new m and the process returns to step 704.

Further, in step 709, if the control unit 19 determines that the m-th test pattern is the last in the memory 2o, the process moves from step 709 to step 711, and returns to the call sign detection operation, that is, in the flowchart of FIG. Return to step 602.

On the other hand, in step 706, when n-2 is determined and the process moves to step 707, the comparator 21 compares the information of the next frame of the video signal to be compared with the n-th information in the memory 20, and the result of the comparison is The control section 19
In step 712, a determination is made.

As a result of this judgment, if they do not match, the process moves from step 712 to step 709, and if they match, the process moves from step 712 to step 713, and the control unit 713 checks whether the nth frame information is the last information. Judgment will be made.

In this case, if it is not the last information, move from step 713 to step 714, set n+1 as a new n, and return to step 707; if it is the last information, step 7
13, in step 715, the result of test pattern detection is output.

Furthermore, when memorizing a specific pattern such as a call sign or a test pattern, the flow of operations as shown in chart 70 of FIG. 8 should be followed.

In FIG. 8, information on the reception channel is stored in the memory 2o in step 801. Then step 80
In step 2, input the video signal to be stored, and in step 803, add a vertical synchronizing signal to the pulse generator 18f, generate a start trigger pulse, trigger the sampling hold circuit 18c, and convert the signal frame by frame. The data is output from the device 18 and stored in the memory 2o in step 804, and the process ends when there is no more video signal to be stored in step 805.

In this way, by making the memory 2o rewritable, it is possible to cope with changes in the call sign broadcast.

FIG. 9 is a flowchart for detecting information on a specific position on this still screen. First, step 9
01, the video synchronization signal and the audio signal output from the TV tuner 13 are separated into an audio signal and a video synchronization signal by the frequency separation circuit 18a, and this video synchronization signal is sent to the amplitude separation circuit 18d, and the video signal is and synchronization signals.

The video signal is sent to the sampling and hold circuit u 18 c, and the synchronization signal is sent to the frequency separation circuit 18e. This frequency separation circuit 18e separates the synchronization signal into a vertical synchronization signal and a horizontal synchronization signal.

The vertical synchronization signal is sent to pulse generator 18f, and the horizontal synchronization signal is sent to pulse generator 18g. By sending this vertical synchronizing signal to the pulse generator 18f, the process moves from step 901 to step 902.

In step 902, the pulse generator 18f generates a trigger pulse signal synchronized with the vertical synchronizing signal, and in step 903, this trigger pulse is used as a start trigger pulse to start the sample jig-hold circuit 18c.

Further, in step 901, the horizontal synchronization signal is sent to the pulse generator 18g, and in step 904, the pulse generator 18g generates a trigger pulse signal synchronized with the horizontal synchronization signal, and uses it as a reset pulse signal. , in step 905, the sampling and holding circuit 18
Send to C.

Accordingly, the sampling and holding circuit 8C resets the levels of the video signal and audio signal being held. “In addition, in step 904, the pulses generated by the pulse generator 18g are transferred to the transfer device 1 in step 906.
8h, the phase of this pulse is shifted by 180°, and this shifted signal is sent to the sampling and holding circuit 18c.

Accordingly, in step 907, a pulse signal obtained by shifting the levels of the video signal and audio signal by 180° is sampled and held as a set trigger.

Step 9 Adjust the level of this sampled video signal.
08, it is sent to the A/D converter 18i, where it is converted into digital data and sent to the comparator 2 as video information (or audio signal).
Sent to 1. Then, as described above, step 9
At step 05, the sampling hold circuit 18c resets the levels of the video signal and audio signal held by the reset trigger output from the pulse generator 18g.

Next, in step 905, the control unit 19 determines whether all the signals have been converted into information.
If the conversion into information has been completed, the series of operations of the signal converter 18 has been completed; if the conversion has not been completed, step 9
09 returns to step 901.

In the above embodiment, the output of the signal converter 18- is converted into digital data and compared with the output of the memory 20 by the comparator 21, but it is also possible to compare it in an analog manner by combining it with a VTR or the like. It's okay.

Furthermore, since the amount of information to be handled in this invention is enormous, the data is appropriately narrowed down, but of course the entire video signal may be used for detection.

As described above, according to the automatic power cut-off device for TV of the present invention, information from the TV tuner is compared with specific information stored in the memory, and the result of the comparison is determined by the power supply for the TV receiver. By triggering the on/off switch to cut off the power, even if you fall asleep with the power on, or a child plays a trick and leaves the TV set on, the broadcast will end. The power can be turned off automatically at times.

Furthermore, since the device does not simply detect the presence or absence of broadcasting, the power will not be turned off due to channel switching or the like.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a TV receiver turn-off device using a conventional time switch, FIG. 2 is a block diagram showing the configuration of an embodiment of the TV automatic power cut-off device of the present invention, and FIG.
The figure is a block diagram showing the detailed configuration of the signal converter in the automatic power cut-off device for a TV, and each of FIGS. 4 to 9 is a flowchart showing the operation flow of the automatic power cut-off device for a TV. 11...Power supply 12...Switch 13...
TV tuner 14... video demodulation circuit 15... cathode ray tube 16.
...Audio demodulation circuit 17...Speaker 18...Signal converter 19...Control unit 20...Memory
21... Comparator patent applicant Pioneer Co., Ltd. Figure 5 Figure 8

Claims (1)

[Claims] A switch that is connected between the TV receiver and the power supply and automatically releases the on state by a trigger signal, a memory that stores information about a specific video signal or audio signal, and information about the video signal or audio signal from the TV tuner. a comparator that compares the information stored in the memory; and a comparator that inputs the comparison result of this comparator to determine whether or not to send a trigger signal to the switch; An automatic power cut-off device for TVs that is similar to the control unit that controls the comparison operation command of the comparator.