JPH07322169A - Television signal receiver - Google Patents

Abstract

PURPOSE:To turn off the power source at the time or the end of broadcast at midnight or the like to save electricity by providing a television signal absence/presence detection means, which detects the absence of a television signal, and a power-off means which turns off the power source for television display at the time of detecting the absence state of the television signal. CONSTITUTION:A television signal detection circuit 28 is provided to detect the presence or the absence of a synchronizing signal obtained in a video signal circuit 14. The circuit 28 supplies the detection signal of the presence or the absence of the television signal to a microcomputer 24. The microcomputer 24 controls a power supply circuit 20 to turn off the power to principal members of television such as a television tuner 12, the video signal circuit 14, and a display device 16. If the television signal does not exist, a timer in the microcomputer 24 is used to wait for a certain time. If the television signal does not exist still after elapse of the certain time, a command is sent to the power supply circuit 20 to turn off the power source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a television receiver that performs reproduction on the screen, recording on a magnetic tape, and the like, and particularly relates to control of turning off the power.

[0002]

2. Description of the Related Art Conventionally, television signal receivers such as television receivers and video decks for receiving television broadcast are known. In these television signal receivers, a television signal transmitted from a broadcasting station is received by a television tuner via an antenna, and an image and sound of television broadcasting are reproduced based on the received signal. Further, in the VCR, the received TV signal is recorded on a video tape so that the image and sound of the TV broadcast can be appropriately reproduced.

On the other hand, television broadcasting is not carried out for 24 hours, and the broadcasting often ends at midnight. When the television receiver is turned on after the television broadcast ends, the screen is displayed even though there is no television signal, so that a noise screen such as a sandstorm is displayed.

If the user is looking at the screen and such a noise screen is displayed due to the end of the broadcast, the power of the television receiver is turned off and no problem occurs. However,
The broadcast ends normally at midnight, and the user often forgets to turn on the power of the television receiver and goes to bed. In such a case, a noise screen is displayed as it is on the screen of the television receiver, resulting in wasteful power consumption.

Therefore, as a conventional television receiver, a television receiver having an off timer is known, and the above-mentioned problems are solved by automatically turning off the television receiver at a predetermined time. It was

[0006]

However, the method of turning off the power of the television signal receiver by the above-described off timer causes a problem when the power is turned off at the end of all television broadcasting. However, there is a problem that the operation is complicated because the timer has to be set again when the user wants to continue watching TV after setting the off timer.

Further, if the off timer is not set, the power is not turned off. In that case, there is a problem that the noise screen is continuously displayed on the television receiver even after the end of broadcasting. there were.

The present invention has been made to solve the above-mentioned problems, and a television capable of automatically turning off the power source of a television receiver or the like when a television broadcast cannot be received after the broadcast ends. An object is to provide a signal receiver.

[0009]

SUMMARY OF THE INVENTION The present invention is a television signal receiver for receiving a television signal, the television detecting the absence of the television signal when the television signal cannot be detected for a predetermined time or longer from the content of the received signal. It has a signal non-existence detecting means and a power off means for turning off the power for displaying the television when the non-existence state of the television signal is detected, and turns off the power at the end of broadcasting such as midnight. It is characterized by saving electricity.

Further, the television signal presence detecting means includes a synchronizing signal detecting means for detecting a synchronizing signal from the received signal, and a continuous state detecting means for detecting that the state in which the synchronizing signal cannot be detected has continued for a predetermined time or more. It is characterized by having.

Further, when there is an operation instruction signal presence / absence detecting means for detecting the presence / absence of a signal instructing an operation of the television signal receiver, and the television signal presence detecting means cannot detect the television signal for a predetermined time or more Also in the above, the power supply is not turned off when there is an operation instruction signal.

[0012]

As described above, according to the present invention, the power of the television is automatically turned off in the absence of the television signal. Therefore,
Power can be saved without the power being left on at the end of broadcasting such as at midnight.

Further, by detecting the absence of the television signal based on whether or not the synchronization signal is present in the received signal, it is possible to effectively detect the absence of the television signal. Further, since the power supply is turned off for the first time when the non-detection state of the synchronization signal continues for a certain period of time, no erroneous determination is made at the time of channel switching.

When some operation is performed,
It is considered that the user knows that there is no TV signal and does not want to turn off the power. In such a case, the power can be prevented from being turned off.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the embodiment.

The antenna 10 supplies the television tuner 12 with the television broadcast wave transmitted from the television broadcast station. The television tuner 12 performs predetermined tuning / amplification processing on the received signal, extracts a television broadcast wave from a desired broadcasting station, and supplies this to the video signal circuit 14. The video signal circuit 14 performs processing such as demodulation of the extracted TV broadcast wave on the display 16 into a signal for display. And, depending on the demodulated signal,
Display based on the received signal is performed on the display 16. The audio reproduction is performed by supplying the audio signal obtained also in the television tuner 12 to a speaker (not shown).

Power for operating the TV tuner 12, the video signal circuit 14, the display 16 and the like is supplied from the power supply circuit 20. Further, various operation switches 22 are provided in the main body of the television receiver, and operation signals of the operation switches 22 are supplied to the microcomputer 24. Further, the main body is adapted to receive a signal from a remote control (remote control) switch 26, and the signal from this remote control is also supplied to the microcomputer 24.

The microcomputer 24 uses these operation switches 2
2. Receiving a signal from the remote controller 26, the tuning frequency of the TV tuner is changed, the channel is selected, the volume is adjusted, and other processes based on various commands are performed.

In this embodiment, a television signal detection circuit 28 is provided to detect the presence / absence of a sync signal obtained in the video signal circuit 14. That is, the video signal of the television signal is
A horizontal and vertical synchronizing signal is included in addition to the signal indicating the content of the image. An NTSC television displays 30 frames (60 fields) of video per minute. One field is composed of 262 or 263 scanning lines (horizontal lines). Therefore, the television signal indicates its display position by the horizontal synchronizing signal inserted for each horizontal line and the vertical synchronizing signal inserted for each field, and the video circuit recognizes this synchronizing signal. Then, the screen on the display 16 is reproduced. Then, this synchronizing signal (vertical synchronizing signal) is the television signal detecting circuit 28.
The television signal detection circuit determines whether or not a sync signal is present.

When the television broadcasting such as midnight ends, the transmission of the television signal from the television station is stopped. Then, the television signal does not exist in the received signal, and the sync signal also does not exist. As described above, the synchronization signal is inserted in the video signal at every predetermined time and is a pulse signal having a lower level than the video signal. When the screen is reproduced, the sync signal is detected to control the scanning of the display 16, and the absence of the sync signal can be easily detected by various means.

The television signal detection circuit 28 supplies a signal regarding the presence or absence of the detected television signal to the microcomputer 24. Then, in the present embodiment, the microcomputer 24 controls the power supply circuit to turn off the power supply to the TV tuner 12, the video signal circuit 14, the display 16 and other main components of the TV.

This operation will be described with reference to FIG. When the television is turned on according to a user's instruction, the microcomputer 24 determines whether or not there is a television signal from the signal from the television signal detection circuit 28 (S).
1). If there is a television signal, this determination is repeated. When the television signal is exhausted, a timer inside the microcomputer 24 is used to wait for a certain time (S2). If the operation switch 22 or the remote controller 26 is operated during this period, the process returns to S1. In S2, when a certain time has elapsed, it is determined whether or not there is a TV signal (S3).
Return to. On the other hand, if there is still no television signal after a certain period of time, a command is sent to the power supply circuit 20 to turn off the power (S4).

As described above, in the present embodiment, when the television signal is not present for a certain period of time, the power of the television without the television signal is automatically turned off. Therefore,
When you go to bed with the TV on, you can automatically turn off the power when the TV broadcast ends. Therefore, it is possible to achieve power saving without continuously displaying a screen like a sandstorm in the absence of a television signal. Since the power supply is turned off for the first time after the non-detection state of the synchronization signal has continued for a certain period of time, an erroneous determination is not made at the time of channel switching or the like. Further, the power is not turned off when any operation is performed. This is because the user knows that there is no TV signal and does not want to turn off the power.

Although other methods may be used for recognizing the absence of the TV signal, the synchronizing signal is originally recognized by the TV, and it is efficient to use this. Further, the recognition that the television signal does not exist for a certain period of time is not necessarily limited to the above flow chart, and for example, the determination of the presence or absence of the television signal is repeated in a predetermined cycle, and the number of times the determination of the absence of the television signal continues is counted. Alternatively, a method of recognizing when a predetermined number is reached may be used.

The duration of the television signal non-existing state before the power is turned off may be, for example, about 8 fields so that the user can change the set time. Furthermore, the present invention can be similarly applied to a video deck device or the like that receives a television signal.

Further, there has conventionally been an IC for superimposing and displaying a character on a television signal, and in this character generating IC, a synchronizing signal is detected to determine the display position of the character. Therefore, it is advisable to detect the presence or absence of a motivation signal by means of this IC for character generation.

[0027]

As described above, according to the present invention, the power of the television is automatically turned off when the television signal is absent.
Therefore, at the end of the broadcast such as at midnight, power can be saved without being left on.

Further, the absence of the television signal can be effectively detected by detecting the absence of the television signal based on whether or not the sync signal is present in the received signal. Further, since the power supply is turned off for the first time when the non-detection state of the synchronization signal continues for a certain period of time, no erroneous determination is made at the time of channel switching.

When any operation is performed,
It is considered that the user knows that there is no TV signal and does not want to turn off the power. In such a case, the power can be prevented from being turned off.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment.

FIG. 2 is a flowchart illustrating the operation of the embodiment.

[Explanation of symbols]

 10 Antenna 12 TV Tuner 14 Video Signal Circuit 16 Display 20 Power Supply Circuit 22 Operation Switch 24 Microcomputer 26 Remote Control 28 Television Signal Detection Circuit

Claims (3)

[Claims] 1. A television signal receiver for receiving a television signal, the television signal absence detecting means for detecting the absence of the television signal when the television signal cannot be detected from the content of the received signal for a predetermined time or more, and a television. A power-off means for turning off the power supply for displaying the television when a signal absence state is detected; and a power-off means to save power at the end of broadcasting such as at midnight. Signal receiver. 2. The television signal receiver according to claim 1, wherein the television signal presence detection means is a synchronization signal detection means for detecting a synchronization signal from the received signal, and a state in which the synchronization signal cannot be detected continues for a predetermined time or more. A television signal receiver comprising: a continuous state detecting unit that detects that the signal has been transmitted. 3. The television signal receiver according to claim 1, further comprising operation instruction signal presence / absence detecting means for detecting the presence / absence of a signal instructing an operation of the television signal receiver. A television signal receiver characterized in that the power is not turned off when there is an operation instruction signal even when the television signal cannot be detected for a predetermined time or longer by the signal presence detecting means.