JPS6090476A - Automatic shut-off device of television set - Google Patents

Abstract

PURPOSE:To prevent unpleasant noise after the program ends by turning off or decreasing the voice when the image signals are not inputted to the television set in the receiving condition and by switching off the power supply of the set after the fixed time has passed. CONSTITUTION:When a power supply plug PU is inserted into a plug socket, first, a standby power supply 6 is operated, and a power-supply voltage is supplied to a shut-off circuit 9 and micro-computer for the channel selection. When the television is broadcasted, the shut-off circuit 9 detects the vertical synchronizing signal from a synchronizing separator circuit 4 and preserves a main power supply 8 to ON condition. When the television broadcasting ends, the vertical synchronizing signal will not come, and the shut-off circuit 9 discriminates this and sends out the muting signal to a voice signal circuit 2 and a color signal reproducing circuit 3 and does not cause the voice and sets the picture to the blanking condition. When the condition continues for the fixed time, the main power supply 8 is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a novel automatic shutoff device for television receivers. Specifically, S indicates that a television broadcast has ended, or if a video tape recorder is being used to play back images recorded on a video tape, a recorded program, etc. that is being magnetically recorded and played back on a video tape has ended. A new type of television receiver that immediately prohibits or at least attenuates audio playback to prevent unpleasant noise from occurring, and then turns off the television receiver after a certain period of time. The present invention attempts to provide an auto-shutoff device.

BACKGROUND TECHNOLOGY AND PROBLEMS It is not uncommon for people to be attacked by drowsiness while watching a television program late at night and fall asleep with the television receiver on. In this case, after the broadcast ends, the television receiver generates an unpleasant sound due to noise, which may disturb a good night's sleep and cause a nuisance to neighboring rooms, neighbors, etc. and,
Leaving the TV set on even when no programs are being broadcast wastes electricity.

Additionally, if a viewer leaves his or her seat while playing a program magnetically recorded on a videotape using a videotape recorder, the program magnetically recorded on the videotape will end and the videotape will disappear. When the recorded portion is being played back, the television receiver may continue to emit an unpleasant noise, causing a nuisance to neighboring rooms, neighbors, etc., and causing electrical problems. It will be a waste of money.

Purpose of the Invention The present invention provides, when a television broadcast ends,
Alternatively, when a video tape recorder is used to play back images recorded on a video tape, when the recorded program, etc. ends, at least the playback of the audio is prohibited or the audio is attenuated, causing unpleasant noise. The purpose of the present invention is to provide a new automatic shunt-off device for a television receiver, which prevents this from occurring and turns off the power to the television receiver after a certain period of time has elapsed.

SUMMARY OF THE INVENTION To achieve the above objects, the present invention provides an automatic shut-off device for a television receiver, which at least turns off or attenuates the audio when no video signal is input to the television receiver. The television receiver is characterized in that the power to the television receiver is turned off after a preset power-off hold time has elapsed without the video signal being input.

Embodiment 1 Hereinafter, an automatic shutoff device for a television receiver according to the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

FIGS. 1 and 2 are for explaining an example of an embodiment of an automatic shutoff device for a television receiver according to the present invention. In the drawing, 1 is a video receiving circuit, 2 is an audio signal circuit, 3 is a color signal reproducing circuit, 4 is a synchronization circuit, 5 is a deflection circuit, and 6 is a circuit that receives a predetermined power supply voltage as long as the power plug Pu is plugged into the outlet. The standby power generated is used to send a power supply voltage to a shutoff circuit, which will be described later, and a microcomputer for channel selection L and N (not shown). 7 is a relay that turns on and off the main power source 8 (this is controlled by a main microcomputer (not shown); the main power source 8
is the voltage for heating the cathode ray tube heater (6.3V
), generates the power supply voltage for the main microcomputer and the power supply voltage for each circuit of the television receiver. 9 is a shut-off circuit, which sends a muting signal to the audio signal circuit 2 and the color signal reproducing circuit 3 when no video signal is input to the video receiving circuit 1, so that no audio is output and the screen is blanked. It plays the role of turning off the main power supply 8 when the main power supply 8 is connected for a certain period of time and no video signal is input.

FIG. 2 shows the circuit configuration of the shutoff circuit 9.

Ql is an NPNI resistor that receives the vertical synchronizing signal VsynC via the resistor R1, and has the function of discharging the capacitor C1. The vertical synchronizing signal Vsync input to the (NPN) transistor Q1 is a synchronously separated signal, and each time the vertical synchronizing signal Vsync arrives, the transistor Ql is turned on to discharge the capacitor C1. Specifically, the emitter and terminal of transistor Ql' (7) and one terminal of capacitor C1 are both grounded, the collector of transistor Ql is connected to the opposite terminal of capacitor C1, and the terminals of capacitor C1 are connected to each other. It is designed to be short-circuited by transistor Ql. One end of a resistor R2 is connected to the opposite terminal of the capacitor C1 to the ground, and the capacitor C1 is charged by the main power supply 8 via the resistor R2.

C2 is an NPN transistor whose base is connected to the terminal on the anti-ground side of the capacitor C1, whose collector is connected to the main power supply 8 and whose emitter is connected via a resistor R3. An emitter floor transistor circuit is constructed. , R4
and C2 are a resistor and a capacitor that are connected to each other in a curved line to form an integrating circuit that integrates the output voltage of the emitter floor transistor circuit, and the inverse resistance R of the capacitor C2 is
The terminal on the 4 side is grounded, and the terminal on the anti-capacitor side of the resistor R4 is connected to the emitter of the transistor Q2, which is the output terminal of the emitter floor circuit. It is also connected to the muting Kugata terminal of the reproducing circuit 3. D has its cathode connected to the collector of transistor Q2, and capacitor c2
This is a giode with 7 nodes connected to the terminal on the anti-grounding side of This is for discharging the capacitor c2 via the transistor Ql. R
8 is a resistor connected in parallel to the capacitor c2.

Q3 is an NPN transistor whose base is connected to the output terminal of an integrating circuit consisting of resistor R4 and capacitor c2.
The emitter and terminal are grounded, and the collector is connected to the anti-ground terminal of a resistor R9 whose one end is grounded. The resistance R9
is connected to standby power supply 6 via resistor RIO. The connection point between resistor R9 and RIO is connected to the base of transistor Q4 via resistor R11. The emitter and collector of the transistor Q4 are connected to the main microcomputer, and the transistor Q4 functions as a power switch for a key matrix (not shown).

The circuit operation of the shutoff circuit shown in FIG. 2 will be explained below.

When television broadcasting is being performed, the transistor Ql turns on every vertical period and discharges the capacitor C1, so the terminal voltage of the capacitor CI, which is charged from the main power supply 8 through the resistor R2, can be raised. , the level at the connection point between the emitter of the emitter floor transistor Q2 and the resistor R3 is kept "low". Therefore, the transistor Q3 remains off, and does not affect any part of the voltage dividing circuit consisting of the resistors RIO and R9, which divides the voltage from the standby power supply 6. The output voltage of the voltage dividing circuit made up of resistors R10 and R9 is also set to a value sufficient to keep the transistor Q4 in the off state, so the transistor Q4 is kept in the off state. This l transistor Q4 functions as a power switch for the key matrix, but remains off while television broadcasting is being performed, and the main power source 8 is not turned off.

Then, when the television broadcast ends, the vertical synchronization signal Vsync no longer arrives at the transistor Ql. Then, the transistor Q1 remains off, and the capacitor C1 is released from the discharged state by the transistor Q1. Therefore, the capacitor C1 is charged by the main power supply 8 through the resistor R2, and the terminal voltage of the capacitor Ct increases to 1+7 relatively quickly. However, the time constants of the capacitor C1 and the resistor R2 are set so that the transistor Q2 will not be turned on even if the vertical synchronizing signal Vsync does not arrive for a very short period of one or several pulses. This is the channel Jino exchange,
This is to prevent muting from occurring due to temporary noise intrusion, temporary poor reception, etc.

When the terminal voltage of capacitor C1 rises and exceeds a certain value, transistor Q2 turns on, and the transistor Q
A coupling signal is sent from the audio signal circuit 2 and the color signal reproduction circuit 3 through the resistor R5. Therefore, no audio is output.

Also, the screen of the cathode ray tube is blanked.

As described above, when the transistor Q2 is turned on, the capacitor C2 is charged through the transistor Q2 and the resistor R4, and its terminal voltage rises by 2. When this terminal voltage exceeds a certain value, transistor Q3 is turned on.

In this way, even if the end of broadcasting is detected, the transistor
The purpose of preventing power supply 3 from turning on is to provide a power-off hold time. The reason for providing a power-off hold time is to prevent the power from being cut off when the video tape recorder is in rewind or fast-forward mode I.

This is because a home video recorder does not output a video signal when rewinding or fast forwarding a videotape, so it is natural that the vertical synchronization signal Vsync is sent from the synchronization circuit 4 of the television receiver to the shutoff circuit 9. Not sent. Therefore, it is necessary to provide a power-off hold time so that the power does not turn off immediately when the rewind or fast-forward mode is set. and,
This power-off hold time is, of course, the time required for rewinding and fast forwarding (this varies depending on the model of video tape recorder, but
, -6 minutes in the example), and in this embodiment it is set to 10 minutes. However, this power-off hold time does not absolutely have to be 10 minutes, but should be selected appropriately depending on the model of the video tape recorder.

As mentioned above, since capacitor c2 starts being charged, 1
When the 'IL source disconnection hold time of 0 minutes has elapsed, the transistor Q3 is turned on, and accordingly, the I transistor functions as a power switch constituting the key matrix circuit. 4 is also turned on. When the transistors Q and 4 are turned on, this is detected by the main microcomputer, and the main microcomputer switches the relay circuit 7 to the disconnected state, and the operation of the main power supply 8 is interrupted.

In the above embodiment, when the end of broadcasting is detected, the muting signal No. 4 is sent from the shutoff circuit 9 to both the audio signal circuit 2 and the color signal reproducing circuit 3, which not only prevents the sound from being output. , the screen of the television receiver is blanked. However, the muting signal may not be sent to the color signal reproducing circuit 3, and the noise image may remain displayed without blanking the screen of the television receiver. Further, when the muting signal is input to the audio signal circuit 2, the noise is completely prevented from being generated, but instead of completely preventing the noise from being generated, the level of the signal is attenuated and the volume is lowered. You may choose to keep it at .

Embodiment 2 FIGS. 3 and 4 show a second embodiment of an automatic shut-off device for a television receiver according to the present invention.

Negative S While the embodiments shown in Figures 1 and 2 are equipped with a special circuit called a shut-off circuit, this embodiment can operate a television receiver without providing a special circuit. Muting and turning off the power supply νJ is performed using a microcomputer that controls the system.

Figure 3 is a block diagram showing a microcomputer.
1 is a read-on memory (ROM), l2 is a random access memory (RAM), l3 is a light receiving diode that receives a remote control signal using infrared light from a remote controller for a television receiver (not shown), and 14 is a light receiving diode 13. 15 is an interface (INIF) for inputting various kinds of signals other than remote control signals. You can also import synchronization signals using this interface (
INIF)15. 16 is an interface (INIF) that outputs various signals from the microcomputer to the outside, and it outputs muting signals to the audio signal circuit and color signal reproduction circuit in the television receiver, and turns on the AC power supplied to the main power supply. A switching signal to the relay--circuit to turn off is output from the interface 16.

FIG. 4 is a flowchart showing a program executed by the microcomputer shown in FIG.

(a) "Main processing" When the microcomputer starts operating, it is first set to an initial state, and then main processing is performed. This main processing is a general processing for controlling a television receiver.

(b) ``In what state is the power turned on?'' When the ``main processing'' in step (a) is completed, it is determined whether the power is turned on. If the determination result is "NO", the process returns to the "main process" of step (a).

(c) Is there rVsync? ” If the result of the determination in step (b) is “yes”, is there a rVsync that determines whether the vertical synchronization signal Vsync has arrived? ” is determined.

(d) "Timer reset" If the result of step (c) is "yes", resets the timer in the microcomputer that determines A11 the duration of the state in which the vertical synchronization signal Vsync does not arrive. ·do.

(e) "Muting operation" If the result of judgment of step (c) is "no", mute. Send link signal to audio signal circuit and color 4i;
tzu (Puts the 1f live circuit into muting state.

(f) "Timer operation" After the operation of putting the audio signal circuit and the color signal reproducing circuit into the muting state is completed, the timer is operated and the time is measured by the timer.

(1.) "Has the power-off reservation time been reached?" Step -Has the matrix been reached?'' is determined.If the result of the determination is ``no'', the process returns to the ``main processing'' of step (a).

(H) "Power-off processing" If the determination result in step (G) is "yes", the power-off processing is performed. Then, when the process of turning on the power supply νj is completed, the process returns to the "main process" of step (a).

In this way, it is also possible to automatically mute and turn off the power by using a microcomputer for controlling the television receiver installed in the cabinet of the television receiver without installing a special electronic circuit. .

Effects of the Invention As described above, the automatic shutoff device for a television receiver of the present invention mutes at least 11 voices or shuts off at least 1 voice when only video values are input to the television receiver in the receiving state. It has been determined in advance that the video signal will not be input manually.
This system is characterized in that the power to the television receiver is turned off after 11f has elapsed. Therefore, according to the auto-shirt I/off device of the television receiver of the present invention, when the broadcast notification ff is reached, at least the audio is muted or attenuated accordingly.

Therefore, it is possible to reliably prevent the user from falling asleep with the television receiver on and then having the broadcast end, causing unpleasant noises to be generated from the speakers and disturbing his sleep. Also, after the broadcast ends, the power supply is cut off 9 times, 1 time, 1 time, and 11 times! Since the television receiver is automatically turned off after 1111 hours have elapsed, it is possible to prevent unnecessary consumption of power. Then, instead of turning off the power immediately when the broadcast ends, the power is not turned off until the power-off hold time has elapsed, so when using a video tape recorder, the tape can be fast-forwarded or rewound. This can prevent the power from turning off automatically.

[Brief explanation of drawings]

1 and 2 show an example of the implementation of an auto-shutoff device for a television receiver according to the present invention. FIG. 1 is a block diagram showing the entire television receiver and shutoff circuit, and FIG. 3 is a circuit diagram showing the internal circuit configuration of the shutoff circuit, FIGS. 3V and 4 show other embodiments of the automatic shutoff device for the television receiver of the present invention, and FIG. 3 shows the configuration of the microcomputer. The block diagram shown in FIG. 4 is a flowchart showing the flow of a program executed by the microcomputer. Explanation of symbols 9... Shunt-off circuit

Claims (1)

[Claims] (1) When a video signal is not input to a television receiver that is receiving data, at least the audio will be turned off or attenuated, and the video signal will not be input until a preset power-off hold time has elapsed. An automatic shut-off device for a television receiver, characterized in that the television receiver is turned off after the television receiver is turned off.