KR19980023268A - Television receiver with automatic operation mode switching - Google Patents

Abstract

According to the present invention, when the power is turned on, if the operation mode is a video mode, the VCR (Video Cassette Recoder) input terminal determines whether a video signal is input, and if there is no video signal, the operation mode is automatically switched to a television mode. A television receiver, comprising: a television receiver having switching means for switching and outputting a broadcast signal and a video signal in accordance with a predetermined control signal; Video signal detecting means for outputting a predetermined result signal when the video signal is detected by detecting the presence or absence of a video signal, and switching the switching means when the result signal is input from the video signal detecting means when the television is turned on. And control means for controlling to output a broadcast signal.

Description

Television receiver with automatic operation mode switching

The present invention relates to a television receiver, and in particular, when the power is turned on, when the operation mode is a video mode, it is determined whether or not a video signal is input from a VCR (Video Cassette Recorder) input terminal. A television receiver having an automatic operation mode switching function.

1 is a functional block diagram showing a schematic configuration of a typical television.

In the drawing, reference numeral 1 denotes an antenna, 2 denotes a tuner which tunes a predetermined broadcast signal from a broadcast signal received through the antenna 1 under the control of the controller 10 to be described later, and 3 denotes this tuner 2 IF amplification section for amplifying the IF signal output from the (4), 4 is a surface acoustic wave for separating the image intermediate frequency signal (PIF) and the audio intermediate frequency signal (SIF) from the IF signal output from the IF amplifier (3), for example A P / S separation unit such as a filter, 5 is an audio detector for detecting an audio signal from the SIF signal, and 6 is an image detector for detecting an image signal from the PIF signal.

Further, reference numeral 7 denotes a remote control unit for selecting a channel desired by the viewer or performing TV / AV mode switching, etc. 8 denotes a receiving unit for converting an infrared signal from the remote control unit 7 into an electric code signal. Is a channel memory in which predetermined channel data is stored, 10 is a control unit for controlling the entire apparatus according to the remote control signal from the remote control unit 7, 11 is OSD pattern data for displaying an operation state of a television to a viewer. OSD generating unit.

In the meantime, reference numeral 12 denotes an external AV device such as a video cassette recorder (VCR) or a laser disc player, and 13 denotes the voice detector 5 and the image detector 6 according to the switching signal from the controller 10. And a switching unit for selectively outputting audio and video signals from the external AV device 12 and audio and video signals from the external AV device 12.

In addition, although reference numeral 14 is not shown for the audio signal output from the switching unit 13, the voice such as bass, treble, volume, etc. in accordance with the control signal from the control unit 10. 15 is a voice amplifier which amplifies the voice signal processed by the voice processor 14 and outputs it to the speaker.

Although reference numeral 16 is not shown for the image signal output from the switching unit 13, the color, tint, brightness, etc. according to the control signal from the control unit 10; Is an image processing unit that outputs R (Red), G (Green), B (Blue), and luminance (-Y) signals corresponding to the image signal, and 17 denotes a color tone signal output from the image processing unit 16 ( A mixer for mixing and outputting the R, G, B) and luminance (-Y) signals and the R, G, B, and OSD blanking signals (Y ') output from the OSD generator 11, 18 is the mixer (17). A CRT driver for driving a CRT on the basis of the R, G, B and luminance (-Y) signals output from the same.

Further, reference numeral 19 denotes a last channel memory for storing channel data for a channel finally set by a user, and reference numeral 20 denotes a television mode for reproducing a broadcast signal of a television or a video mode for reproducing a video signal. Mode storage means for storing the operation mode.

That is, in the above-described television, when the viewer turns on the television, the controller 10 drives and controls a relay (not shown) to supply power to the entire apparatus and to store channel data stored in the last channel memory 19. The channel tuning is performed by tuning the tuner 2 on the basis of.

In addition, after the user inserts the video tape into the VCR, the user selects a predetermined channel for performing the video mode by using a predetermined input means, selects a video mode, and selects a predetermined playback key for performing the playback operation of the video tape. When (PLAY) is pressed, the controller 10 controls to switch the switching unit 13 to block the broadcast signal input through the tuner 2 and to output the video signal from the VCR. .

On the other hand, when the user ends watching the videotape and then turns off the power of the television, the previously set video mode remains as it is stored in the mode storage means. When the control unit 10 is turned on, the control unit 10 switches the switching unit 13 to output a video signal based on the video mode of the mode storage unit 20. The user inputs a predetermined key to enter the television mode. You have to perform a cumbersome operation that requires resetting.

Accordingly, the present invention has been made in view of the above circumstances, and if the operation mode is a video mode when the power is turned on, it is determined whether or not a video signal is input from a VCR (Video Cassette Recorder) input terminal. It is an object of the present invention to provide a television receiver having an operation mode automatic switching function, which is to be automatically switched to.

1 is a functional block diagram showing a schematic configuration of a typical television.

2 is a functional block diagram showing a configuration of a television receiver having an automatic operation mode switching function according to an embodiment of the present invention.

FIG. 3 is an operation flowchart for explaining the operation of the apparatus of FIG. 2. FIG.

4 is a view showing the video signal detector 32 in FIG.

* Explanation of symbols for the main parts of the drawings

1 antenna 2 tuner

3: IF amplification part 4: P / S separation part

5: voice detector 6: image detector

7: remote control unit 8: receiving unit

9: channel memory 10, 30: control unit

11: OSD generation unit 12: external AV device

13 switching unit 14 voice processing unit

15: audio amplifier 16: image processing unit

17 mixer 18 CRT drive unit

31: mode storage unit 32: video signal detection unit

33: last channel memory

R1, R2, R3, R4: Resistor TR: Transistor

C: condenser

A television receiver having an automatic operation mode switching function according to the present invention for realizing the above object comprises: a television receiver having switching means for switching and outputting a broadcast signal and a video signal in accordance with a predetermined control signal; Video signal detecting means for outputting a predetermined result signal when the video signal is detected by detecting the presence or absence of a video signal, and switching the switching means when the result signal is input from the video signal detecting means when the television is turned on. And control means for controlling to output a broadcast signal.

That is, according to the above configuration, when the television is turned on, the operation mode is the video mode, but when there is no video signal input from the VCR, the user can be automatically switched to the television mode.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a functional block diagram showing a main configuration of a television receiver having an automatic operation mode switching function according to an embodiment of the present invention. In FIG. 2, the same reference numerals are assigned to the parts performing the same functions as those of FIG. Detailed description will be omitted.

In the figure, reference numeral 31 denotes a mode storage unit for storing a television mode or video mode state set by a user using an input means such as the remote controller 7 as a predetermined flag, and reference numeral 32 denotes the above-mentioned from the VCR. A video signal detection unit for detecting the presence or absence of a video signal input to the switching unit 13, which is to output a predetermined result signal to the control unit 30 to be described later when the video signal is detected, 33 Is a last channel memory for storing channel data for a channel finally set by a user, and 30 is a control unit for controlling the entire apparatus.

Next, the operation of the apparatus having the configuration shown in FIG. 2 will be described using the operation flowchart of FIG. 3.

When the user turns on the power of the television (ST301), the controller 30 controls to supply power to the entire apparatus by turning on a relay (not shown), and first, the mode storage unit 31. The mode state of the device is searched (step ST302).

At this time, in the television mode, the broadcast signal is reproduced and output by tuning and controlling the tuner 2 based on the channel data stored in the last channel memory 19 (ST303 and 304). The input signal from the video signal detector 32 is searched for (ST303, step 305).

4 is a diagram illustrating the configuration of the video signal detector 32. When the video signal is not input from the VCR, the voltage applied to the resistor R4 is not present, and thus the transistor TR is turned off. As the signal is output from the collector terminal of the transistor TR, all voltages except for the drop caused by the resistor R1 are output, so that a high level signal is applied to the controller 30, for example. .

In addition, when the video signal is input from the VCR, the voltage dropped through the resistor R4 is charged through the capacitor C, but when the energization voltage of the transistor TR exceeds, the transistor TR is turned on to turn on the transistor TR. The low signal is applied to the controller 30 from the collector end of.

Accordingly, when the high signal corresponding to the video signal input is applied, the controller 30 switches the switching unit 13 to reproduce the video signal (step ST306).

However, when a low signal is applied from the video signal detector 32, the controller 30 sets a mode state of the mode storage unit 31 to a television mode and a predetermined channel of the last channel memory 31. The tuner 2 is tuned based on the data to reproduce the broadcast signal (steps ST307 and 308).

Therefore, according to the apparatus having the above-described configuration, when the television is turned on, the operation mode is the video mode, but when there is no video signal input from the VCR, the user can be automatically switched to the television mode.

In addition, this invention is not limited to the said Example, It can variously deform and implement within the range which does not deviate from the technical summary of this invention.

As described above, according to the present invention, if the operation mode is a video mode when the power is turned on, it is determined whether the video signal is input from the VCR (Video Cassette Recorder) input terminal, and if there is no video signal, the operation is automatically switched to the television mode. A television receiver with an automatic mode switching function can be realized.

Claims (1)

A television receiver comprising switching means for switching and outputting a broadcast signal and a video signal in accordance with a predetermined control signal; Video signal detection means for determining the presence or absence of a video signal and outputting a predetermined result signal if the video signal is not detected; And a control means for switching the switching means to output a broadcast signal when the result signal is input from the video signal detection means when the television is turned on. .