KR19980084365A - TV / VCR mode automatic switching method and television system for performing the same - Google Patents

Abstract

Disclosed are a TV / VCR mode automatic switching method for automatically switching to a video (cassette recorder) mode when a video signal is input in a television (TV) mode, and a television system for performing the same. The television signal and / or the composite video image signal are selectively video-processed in response to the selection signal and output to the display unit, and the selection signal is output in response to the filtered low-pass component of the synchronization signal detected from the composite video image signal. When a composite video image signal is input from an external video cassette recorder or the like when watching television, it can be automatically switched to the video mode without external operation.

Description

TV / VCR mode automatic switching method and television system for performing the same

The present invention relates to an automatic switching method of a TV / VCR mode and a television system for performing the same, and more particularly, to a function capable of automatically switching a TV / VCR mode in a television system for reproducing a television wireless signal or a composite video image signal. A method of automatically switching a TV / VCR mode for performing and a television system for performing the same.

The conventional TV / VCR mode switching method in a television system is as follows.

FIG. 1 is a schematic block diagram of a television system performing a conventional TV / VCR mode switching method, wherein a radio frequency (RF) signal input unit 10, a video signal input unit 12, a selection switch 14, and a video are shown. It consists of a signal processor 16, a microcomputer 18 and a remote controller 20.

The RF signal input unit 10 shown in FIG. 1 inputs a television radio signal from airwaves through the input terminal IN1 and outputs it to the selection switch 14. The video signal input unit 12 also outputs a composite video image signal input from an external video cassette recorder or the like through the input terminal IN2 to the selection switch 14.

The selector switch 14 transmits a television radio signal and / or a composite video image signal input from the RF signal input unit 10 and / or the video signal input unit 12 to the selection signal S output from the microcomputer 18. In response to the video signal processor 16. The video signal processing unit 16 inputs the television radio signal or composite video image signal selected by the selection switch 14 to process video signal processing, that is, chromaticity signal and luminance signal, and processes the processed signal through the output terminal OUT. Output to a display device (not shown), such as a display device, so that a television signal or a video signal can be displayed.

On the other hand, the microcomputer 18 generates a selection signal S so that a television radio signal or a composite video image signal can be selected in response to the remote control signal output from the remote controller 20.

The conventional TV / VCR mode switching method described above has a problem in that when a user wants to watch a video while watching TV, the user has to manually select a TV / VCR mode such as an operation of a remote control.

Accordingly, it is a first object of the present invention to provide a TV / VCR mode automatic switching method for automatically switching to a video mode when a video signal is input in a television mode.

It is a second object of the present invention to provide a television system suitable for carrying out the TV / VCR mode automatic switching method.

1 is a schematic block diagram of a television system for explaining a conventional TV / VCR mode switching method.

2 is a schematic block diagram of a television system having a TV / VCR mode automatic switching function according to an embodiment of the present invention.

3 is a flowchart for explaining a TV / VCR mode switching method according to an embodiment of the present invention.

* Explanation of symbols for main parts of drawings *

12, 42: video signal input section 16, 46: video signal processing section

40: TV signal input unit 44: Signal selector

48: sync signal detector 50: low pass filter

52: control unit

In order to achieve the first object of the present invention described above, the present invention provides the composite video from the outside in a television system which processes a television (wireless) signal in a television mode and processes a composite video image signal in a video cassette recorder mode. Determining whether an image signal is input; Determining whether the television system is in the television mode when the composite video image signal is input, and switching the television system to the video cassette recorder mode if the television system is in the television mode. It provides an automatic switching method.

In order to achieve the above second object of the present invention, the present invention provides a television system comprising a display device for displaying a television signal received through an antenna and / or a composite video image signal input from the outside. Television signal input means for inputting a signal; Video signal input means for inputting the composite video image signal; Signal selection means for selectively outputting the input television signal and / or the composite video image signal in response to a selection signal; Video signal processing means for processing the television signal or the composite video image signal output from the signal selecting means and outputting the video signal to the display apparatus; Synchronization signal detection means for inputting the composite video image signal output from the video signal input means to detect a synchronization signal; A low pass filter for filtering low pass components of a signal output from the synchronization signal detecting means and a control means for outputting the selection signal in response to an output of the low pass filter are provided.

According to the present invention, when a composite video image signal is input from an external video cassette recorder or the like when watching television, it is possible to automatically switch to the video mode without external operation.

Hereinafter, a configuration and operation of a television system having a TV / VCR mode automatic switching function according to the present invention will be described with reference to the accompanying drawings.

2 is a schematic block diagram of a television system having an automatic switching function of a TV / VCR mode according to an embodiment of the present invention, wherein the TV signal input unit 40, the video signal input unit 42, the signal selection unit 44, The video signal processor 46, the sync signal detector 48, the low pass filter 50, the controller 52 and the remote controller 54 are configured.

The TV signal input unit 40 shown in FIG. 2 inputs a TV radio signal from airwaves through the input terminal IN1 and outputs it to the signal selector 44, while the video signal input unit 42 is externally input through the input terminal IN2. The composite video image signal input from the video cassette recorder or the like is also output to the signal selector 44.

The signal selector 44 transmits the television radio signal and / or the composite video image signal respectively input from the TV signal input unit 40 and / or the video signal input unit 42 to the selection signal S output from the control unit 52. In response, the video signal is selectively output to the video signal processor 46. The video signal processor 46 inputs the television radio signal or the composite video image signal selected by the signal selector 44 to process the video signal, that is, the chroma signal and the luminance signal, and outputs the negative signal through the output terminal OUT. Output to a display device (not shown) such as a pre-conductor display device.

On the other hand, the synchronization signal detector 48 detects the synchronization signal by inputting the composite video image signal output from the video signal input unit 42. This is because the composite video image signal includes a color signal, a luminance signal, a horizontal synchronization signal, and the like, so as to detect the synchronization signal and determine whether the composite video image signal is input or not. The low pass filter 50 integrates the synchronization signal detected by the synchronization signal detector 48 to obtain a DC value of a constant level. That is, the low frequency component of the synchronization signal is filtered and the filtered signal is output to the controller 52. When a voltage signal having a constant level is input from the low pass filter 54, the controller 52 outputs a selection signal S to output the composite video image signal output from the video signal input unit 42 to the video signal processor 46. Allow input. Then, if a voltage signal of a constant level is not output from the low pass filter 50, the selection signal S is set so that the television radio signal output from the TV signal input section 40 can be output to the video signal processing section 46. Output

In addition, the control unit 52 may generate the selection signal S such that the television radio signal or the composite video image signal is forcibly selected in response to the remote control signal output from the remote controller (or remote controller) 54.

Hereinafter, a TV / VCR mode switching method performed in the television system shown in FIG. 2 according to the present invention will be described with reference to the accompanying drawings.

Fig. 3 is a flowchart for explaining a TV / VCR mode switching method according to the present invention, which includes forcibly switching the TV / VCR mode (steps 80 to 84), and automatically inputting a composite video image signal in a television mode. Switching to the VCR mode (steps 86 to 90) and switching to the TV mode (steps 92 and 94) when the composite video image signal is not input in the VCR mode.

Referring to FIG. 3, the television system shown in FIG. 2 processes television radio signals in television mode, and processes composite video image signals in video cassette record mode. The controller 52 shown in FIG. 2 determines whether a television key input for processing the television signal from the remote controller 54 has been entered (step 80). If a television key input has been entered, the flow proceeds to step 94 to force the television system to switch to the television mode. However, if no television key input has been entered, the control section 52 determines whether a video cassette recorder key input for processing the composite video video signal has been entered (step 82). If a video cassette recorder key input has been entered, proceed to step 90 to force the television system to switch to video cassette recorder mode. However, if the video cassette recorder key is not input, it is determined whether to stop the video cassette recorder mode (step 84). If you want to stop the video cassette recorder mode, perform step 94 to force the television system to switch to the television mode.

However, if the video cassette recorder mode is not to be stopped, the controller 52 determines whether the composite video image signal has been input by the above-described operation (step 86). If no composite video video signal is input, step 94 is performed to switch to the television mode, and if the composite video video signal is input, it is determined whether the current television system is in the television mode (step 88). If the current television system is in television mode, the television system is automatically switched to video cassette recorder mode (step 90).

However, it is determined whether the television system is not the current television mode and is in video mode (ie, no in step 88) or after step 90 whether the composite video image signal is continuously input (step 92). If the composite video image signal is continuously input, step 80 is performed. However, if no composite video image signal is input, the television system is switched from the video cassette recorder mode to the television mode (step 94).

As described above, according to the present invention, when a composite video image signal is input from an external video cassette recorder or the like during television viewing, it is possible to automatically switch to the video mode without external operation.

As mentioned above, although this invention was demonstrated concretely by the said Example, this invention is not restrict | limited by this, Of course, the deformation | transformation and improvement are possible within the range of common knowledge of a person skilled in the art.

Claims (4)

A TV / VCR mode automatic switching method performed in a television system which processes a television signal in a television mode and processes a composite video image signal in a video cassette recorder mode, (a) determining whether the composite video image signal is input from the outside; (b) when the composite video image signal is input, determining whether the television system is in the television mode; And (c) if the television system is in the television mode, switching the television system to the video cassette recorder mode. The method of claim 1, wherein the TV / VCR mode automatic switching method Determining whether the composite video image signal is input from the outside after the step (c); And And switching the television system to the television mode if the composite video image signal is not input from the outside. A television system having a display device for displaying a television signal received through an antenna and a composite video image signal input from outside, Television signal input means for inputting the television signal; Video signal input means for inputting the composite video image signal; Signal selection means for selectively outputting the input television signal and / or the composite video image signal in response to a selection signal; Video signal processing means for processing the television signal or the composite video image signal output from the signal selecting means and outputting the video signal to the display apparatus; Synchronization signal detection means for inputting the composite video image signal output from the video signal input means to detect a synchronization signal; A low pass filter for filtering low frequency components of the signal output from the synchronization signal detecting means; And And control means for outputting said selection signal in response to an output of said low pass filter. 4. The television system with TV / VCR mode automatic switching function according to claim 3, wherein said control means outputs said selection signal in response to a remote control signal input from the outside.