KR960008567Y1 - Power automatic break apparatus of t.v. - Google Patents

Abstract

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Description

TV power cutoff device

1 is a block diagram of a power cutoff device of a general television.

2 is a block diagram of a power cut-off device of a television according to the present invention.

3 is a flowchart illustrating a power cutoff operation by a power cutoff device of a television according to the present invention.

4 is a waveform diagram showing a voice signal and a noise signal according to a broadcast reception state.

* Explanation of symbols for main parts of the drawings

1: Key Matrix 2: Receiver

3: micom 4,10: television main circuit

12: oscillator 14: clock generator

16: sampling / holding circuit 18: A / D converter

20: latch 22: memory

24: processing unit 26: Central Processing Unit (CPU)

The present invention relates to a power cut-off device of a television, and more particularly, to a power cut-off device of a television that automatically cuts off the power when a TV program is terminated when a viewer falls asleep while watching TV. It is about.

In general, a power cut-off device that automatically cuts off the power of the television is composed of a plurality of keys on the front panel of the television as shown in FIG. 1 and a key matrix 1 for inputting a user's selection signal. A receiving unit (2) for receiving a selection signal from a remote controller for remotely operating the operation of the television, a microcomputer (3) for controlling the operation of the television according to the input signal from the key matrix (1) and the receiving unit (2); And a television main circuit 4 in which an operation is performed in accordance with a control signal output from the microcomputer 3.

On the other hand, the microcomputer 3 is a controller for applying various control signals to the television main circuit 4 according to input signals from the key matrix 1 and the receiver 2, and various data under the control of the controller. For example, the memory device is configured to store a power off time.

A power cut-off device of a general television configured as described above uses the key matrix 1 or the remote control to input a desired power-off time (that is, the time when the regular broadcasting of the television is terminated). It is stored in the memory built in the microcomputer (3). The controller embedded in the microcomputer 3 compares the power-off time stored in the memory with the current time to cut off the power of the television when the corresponding time matches.

However, in the above-described power cut-off device of the television by the configuration operation, if the regular broadcast program is unintentionally outside of the broadcast program end time set by the broadcaster, for example, when the television is broadcast for a longer time due to a special broadcast or sports live broadcasting, the television is currently Only when the time reaches the power off time stored in the memory in the microcomputer (3) to turn off the power of the television, the special broadcast that the viewer wanted to watch or the power is cut off during the sports broadcast, a problem that misses an important point not only occurs. In addition, the inconvenience of having to readjust the power off time manually.

Accordingly, the present invention has been made in view of the above circumstances, and its purpose is to compare the signal output from the audio output terminal of the television with the reference noise level, and if the noise section above the reference noise level is continuously detected, the power of the television is automatically shut off. The present invention provides a power cut-off device for a television.

In order to achieve the above object, a power cut-off device for a television according to the present invention is a power cut-off device for a television that automatically cuts off the power of a television main circuit which processes and outputs broadcast information according to a selected broadcast channel by video and audio signals. An oscillator for generating an oscillation signal, a clock generator for generating a reference clock of a predetermined value in accordance with an oscillation signal from the oscillator, and an output from an audio output stage of the television main circuit based on a reference clock supplied from the clock generator. A sampling / holding circuit for sampling and holding a voice signal to be sampled, an A / D converter for converting a sampling signal held in the sampling / holding circuit into a digital signal based on a reference clock supplied from the clock generator, and supplied from the clock generator Digital scene output from the A / D converter based on the reference clock A latch for holding a call to the next clock, a memory for storing a digital signal from the lay for a predetermined time, and a digital signal having a level equal to or higher than a reference noise level preset based on a reference clock supplied from the clock generator. Is continuously stored in the memory, the processor is configured to output a power cutoff signal.

According to a preferred aspect of the present invention, the clock generator, the A / D converter, the latch, the memory, and the processor are configured as a central processing unit, and the latch and the memory may be configured as a buffer.

According to the present invention as described above, when the audio signal output from the audio output terminal of the television main circuit is converted into a digital signal and the level of the converted digital signal is continuously detected the same or higher signal level than the reference noise level The TV's power turns off automatically.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail.

2 is a block diagram of a power cut-off device of a television according to the present invention, and reference numeral 10 denotes a television which processes and outputs broadcast information of a channel selected by a viewer for viewing among broadcast signals transmitted from a broadcasting station. The main circuit 12 is, for example, an oscillator composed of a crystal oscillator to generate electrical vibrations.

14 is a clock generator for generating a reference clock of a predetermined value according to the oscillation signal from the oscillator 12, and 16 is the audio of the television main circuit 10 based on the reference clock supplied from the clock generator 14; Sampling / holding circuit for sampling (quantifying) the audio signal outputted from the output stage A and holding it until the next input is applied, and 18 is a sampling / holding circuit based on the reference clock supplied from the clock generator 14. An A / D converter converts the sampled signal held at 16 into a digital signal, and 20 is a digital signal output from the A / D converter 18 based on a reference clock supplied from the clock generator 14. The latch is held until the clock is applied.

In the figure, reference numeral 22 denotes a memory for storing a digital signal from the latch 20 for a predetermined time, and 24 denotes a level of the digital signal from the memory 22 in units of reference clocks from the clock generator 14 in advance. When a signal of the same level or a higher signal level is continuously stored compared to the input reference noise level, the processor determines that the broadcast program broadcast on the television is terminated and outputs a power cutoff signal.

Meanwhile, according to a preferred embodiment of the present invention, the clock generator 14, the A / D converter 18, the latch 20, the memory 22, and the processing unit 24 may include a single integrated circuit 26. )to be.

The power cut-off operation by the power cut-off device of the television according to the present invention configured as described above will be described based on the flowchart of FIG. 3.

Once the viewer selects a channel he wishes to watch from among broadcast signals transmitted from a broadcasting station, in step 30, the television main circuit 10 processes video and audio signals of the tuned channel into a monitor and a speaker. In step 31, the sampling / holding circuit 16 samples the audio signal output from the audio output terminal A of the television main circuit 10 based on the reference clock provided from the clock generator 14. The sampling signal is held until the next clock pulse is applied.

When a normal audio signal is output from the audio output terminal A of the television main circuit 10, a signal having a variable level as shown in FIG. 4A is attached to the sampling / holding circuit. 16) is applied. On the contrary, in the case where a broadcast is terminated and a noise signal is output from the audio output terminal A, a signal having a constant level as shown in (b) of FIG. 4 is transmitted to the sampling / holding circuit 16. Is applied.

Subsequently, in step 32, the A / D converter 18 converts the sampling signal held by the sampling / holding circuit 16 into a digital signal, which is held in the latch 20 until the next clock is applied. The digital signal held at the latch 20 at the same time is stored in the memory 22 for a predetermined time.

Then, in step 33 and step 34, the processor 24 analyzes the digital signal stored in the memory 22 to detect a noise section. In this case, the television receives a normal broadcast audio signal and the television main circuit When a signal having a variable level as shown in (a) of FIG. 4 from the audio output terminal A of (10) is applied to the sampling / holding circuit 16, the A / D converter 18 performs the sampling. The digital signal having a variable level is output to the latch 20 by the sampling signal output from the / hold circuit 16 and stored in the memory 22 for a predetermined time.

Accordingly, when the level of the digital signal stored in the memory 22 is detected to be less than or equal to a preset reference noise level, the processor 24 determines that the level of the digital signal is not detected as a noise section. No), the flow advances to step 33 to repeat the above operation.

On the contrary, however, when the broadcast is terminated and a signal having a constant level as shown in FIG. 4B is applied from the audio output terminal A of the television main circuit 10 to the sampling / holding circuit 16, In the A / D converter 18, a digital signal having a predetermined level is output to the latch 20 by the sampling signal output from the sampling / hold circuit 16 and stored in the memory 22 for a predetermined time.

Therefore, when the processor 24 detects that the level of the digital signal stored in the memory 22 is equal to or higher than the preset reference noise level, the processor 24 detects the level of the digital signal as a noise section. According to the result (Yes), it is determined whether the noise section is detected continuously (step 35).

On the other hand, if the noise section is not continuously detected, the processing unit 24 determines that the noise phenomenon is caused by a temporary interruption according to the determination result No in step 35, and proceeds to step 33, where the operation described above is performed. Repeat

On the contrary, if the noise section is continuously detected in the step 35, the processing unit 24 proceeds to step 36 according to the determination result (Yes), and determines that the broadcast program broadcast on the corresponding television is terminated. The power of the television is automatically turned off.

As described above, according to the power cut-off device of a television according to the present invention, the audio signal output from the audio output terminal of the television main circuit is converted into a digital signal, and the level of the converted digital signal is continuously equal to or higher than the reference noise level. When the signal level is continuously detected, the TV is automatically turned off, so that the power is turned off during the TV broadcasting due to the preset power off time, and it is much simpler than the conventional method which requires to readjust the power off time. have.

Claims (1)

A power cut-off device of a television which automatically cuts off the power of a television main circuit 10 for processing video and audio signals and outputting broadcast information according to a tuned broadcast channel, the oscillator 12 generating an oscillation signal; An audio output terminal of the television main circuit 10 based on the clock generator 14 generating a reference clock having a predetermined value according to the oscillation signal from the oscillator 12 and the reference clock supplied from the clock generator 14 ( A sampling / holding circuit 16 for sampling and holding the audio signal output from A), and a sampling signal held by the sampling / holding circuit 16 based on the reference clock supplied from the clock generator 14. An A / D converter 18 for converting to a latch, a latch 20 for holding a digital signal output from the A / D converter 18 until the next clock based on a reference clock supplied from the clock generator 14, A memory 22 for storing the digital signal from the latch 20 for a predetermined time and a digital signal having a level equal to or higher than a reference noise level preset based on a reference clock supplied from the clock generator 14. Is continuously stored in the memory (22), characterized in that it comprises a processing unit (24) for outputting a power cutoff signal.