KR950007540B1 - Normal tv/cable tv signal selecting method - Google Patents

Abstract

The method automatically selects of signal of normal and cable TV and input signal of external line for TV & Video cassette recorder or a TV with VCR. The broadcasting or the external-line input signal is selected by a switch that combines a normal TV/cable TV selecting switch and a tuner/external-line input selecting switch. The method employs a mode selection switch (2), microcomputer (1), for controlling the systems action, a tuner (3) for tuning the combined image signal of input to TV, a brightness/compromasity processor (4) outputting the image signal processed and a audio processor (5) outputting the selected voice signal.

Description

Normal TV / Cable TV / External Line Signal Selection

1 is a block diagram of a normal TV / cable TV / external line signal selection system of the present invention.

2 is a signal flow diagram illustrating the operation of FIG. 1, (a) is a signal flow diagram according to the switching of the mode selection switch, and (b) is a signal flow diagram according to the key selection of the remote controller.

* Explanation of symbols for main parts of the drawings

1: Micom 2: Mode selection switch

3: tuner 4: luminance / chromatic processing unit

5: Audio processor 5a: Voice selection switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automatic selection of broadcast signals and external line input signals of normal and cable TV in TV and video cassette recorders (hereinafter referred to as "V-al") or integrated TVs. The present invention relates to a normal TV / cable TV / external line signal selection method for automatically selecting and watching a broadcast signal and an external line input signal using a single switch of a cable TV selection switch and a tuner / external line input selection switch.

Intra-TV and V-Cal are equipped with a normal TV / cable TV selector switch for selecting normal TV and cable TV, and a tuner / external line signal selector switch for selecting a tuner and an external line input signal. In order for a user to watch normal TV, the normal TV / cable TV selector switch must be switched to the normal TV side, and the tuner / external line signal selector switch must be switched to the tuner side. To watch, switch the normal TV / cable TV selector switch to the cable TV and switch the tuner / external line signal selector to the tuner in the same way as described above. External line signal must be switched to external line input It is possible to watch the arc.

In the conventional TV and BT as described above, in order for a viewer to watch a broadcast signal or an external line signal, it is inconvenient to manually switch each normal TV / cable TV selection switch and a tuner / external line signal selection switch simultaneously. In addition, each of the normal TV / cable TV selection switch and the tuner / external line signal selection switch separately provided a factor of price increase and productivity.

Accordingly, an object of the present invention is to control a tuner, an audio processor, and a gray / color processor according to the normal TV / cable TV / external line signal selection switch as a single switch. The present invention provides a method for selecting a normal TV / cable TV / external line signal to automatically select a video signal and an audio signal of a normal TV, a cable TV, and an external line input.

The object of the present invention is to check the normal TV, cable TV and external line input mode according to the key input of the broadcast mode selection switch and the remote controller, and if the checked mode is the normal TV mode, the phase-locked loop data is recorded. A second process of selecting the data of the normal TV channel and controlling the audio processing unit and the luminance / chromatic processing unit to switch the audio and video signals of the normal TV tuned by the tuner as input; and if the checked mode is cable TV, phase synchronization A third process of selecting loop data as data of a cable TV channel, switching the audio processor and a luminance / chrominance processor to switch audio and video signals of the tuned cable TV in the tuner; Or switch to external line input mode to cut off normal TV and cable TV video and audio inputs To be constituted by any achieved by a fourth step of switching to process the input, or less will be described in detail based on the accompanying drawings, the present invention.

1 is a configuration diagram of a normal TV / cable TV / external line signal selection system according to the present invention. As shown therein, a mode selection switch 2 for switching and selecting a normal TV, a cable TV and an external line input mode, and The microcomputer 1 for controlling the overall operation of the system by generating the enable signal EN, the clock pulse CK, and data and control signals according to the mode according to the mode selection of the mode selection switch 2, and the microcomputer 1 Control the phase-locked loop part 3a with the enable signal EN outputted from the N-axis to synchronize the input phase-locked loop data with the clock pulse CK, and output the data of the TV channel according to the mode to output the composite video of the input TV. A tuner 3 for tuning a signal and an image input switch 4a switched according to the image input selection signal output from the microcomputer 1 to switch the tuner 3 from the tuner video input and an external line which are tuned and output from the tuner 3; Input line A luminance / chromatic processing unit 4 which selects a video input and performs signal processing on the selected video signal, and switches the audio selection switch 5a in accordance with the audio input selection signal output from the microcomputer 1 to tuner ( The tuner audio input tuned in 3) and the line audio input input from the external line are selected, and the audio processing section 5 for signal-processing the selected voice signal is output.

The operation and effect of the present invention configured as described above will be described in detail with reference to FIG. 2 as a signal flow diagram.

First, when the viewer is watching normal TV, if the mode selection key is pressed in order to watch the broadcast signal of the cable TV, the microcomputer 1 scans the mode selection switch 2 and recognizes the current normal TV mode. Indicate that. When the viewer selects the cable TV mode on the display, the mode is switched to the cable TV mode, and the enable signal EN and the clock pulse CK of a predetermined period are input to the phase synchronization loop section 3a of the tuner 3. In addition, the phase synchronization loop data of the cable TV channel is output in series and the video input selection signal and the audio input selection signal are output as high (H) signals.

Accordingly, the tuner 3 tunes and outputs the composite video signal of the cable TV, and the image selection switch 4a of the luminance / chromatic processing unit 4 is a high input signal of the image input selection signal output from the microcomputer 1. The tuner video input is switched by a signal to be tuned and output from the tuner 3, and the selected tuner video input is signal-processed and output by the luminance / chromatic processor 4, and the audio of the audio processor 5 is selected. The selection switch 5a is switched by a high signal of the audio input selection signal output from the microcomputer 1, selects a tuner audio input which is tuned and output from the tuner 3, and then outputs the signal by processing the audio processor 5. Done.

In addition, when the mode selection key is pressed to watch the external line signal in the cable TV mode, the microcomputer (1) scans the mode selection switch and recognizes the current cable TV mode and displays the corresponding items on the screen. When the external line signal mode is selected, the mode selection switch 2 is switched to the external line input, and the video input selection signal and the audio input selection signal are output as the low (L) signal.

Accordingly, the image selection switch 4a of the luminance / chromatic processing unit 4 is switched by the low signal of the image input selection signal output from the microcomputer 1 to select the line video input input from the outside and the selected The line / video input is signal-processed by the luminance / chromatic processor 4 and output, and the voice select switch 5a of the audio processor 5 is switched by a low signal of the voice input select signal output from the microcomputer 1. After selecting the line voice input input from the outside, the audio processor 5 processes the signal and outputs the signal.

In addition, as described above, the mode selection key of the remote controller may be operated by only one mode selection key and the key for designating the mode, and thus the normal TV, the cable TV, and the external line input signal may be automatically selected.

That is, as shown in (b) of FIG. 2, each time the mode selection key of the remote controller is pressed, the current mode state is checked and automatically converted into the normal TV, cable TV, and external line input mode order.

For example, when the mode selection key signal is input from the remote controller, the microcomputer 1 checks the currently displayed broadcast mode state by scanning the mode selection switch, and if the current broadcast mode is the normal TV mode, converts the cable TV mode state to the cable. If the current broadcast mode is not normal TV mode, it checks again whether it is cable TV mode and if it is cable TV mode, it converts to external line input mode and processes video and audio signals from external lines. In addition, if the current broadcast mode is not the cable TV mode, the normal TV mode is converted back to display the broadcast signal of the normal TV.

In another embodiment of the present invention, in the models of stereo and hi / fi TV, the mode selection switch 2 described above is set to normal TV / normal TV simulation mode / cable TV / cable TV simulation mode / external. As in the line input mode, the mode is set to five states so that the mode can be selected with one switch.

As described above, the present invention provides a tuner, an audio processing unit, and a luminance / color processing unit according to the normal TV / cable TV / external line input mode selection switch with one switch. By controlling, it is possible to automatically select video signals and audio signals of normal TV, cable TV and external line input.

Claims (2)

A first step of checking whether the user's input selection is one of a normal TV, a cable TV, and an external line input mode; and if the mode checked in the first step is normal TV, the phase-locked loop data is converted into the normal TV channel data. A second process of inputting and processing audio and video signals of the normal TV tuned by the tuner by controlling the audio processor and the luminance / chromatic processor; and if the mode checked in the second process is a cable TV mode, The third step of inputting the audio and video signals of the cable TV tuned by the tuner by selecting the cable TV channel data and controlling the audio processor and the luminance / color processor, and the mode checked in the second step are Otherwise, it is converted into an external line input mode to cut off normal TV and cable TV, and performs a fourth process of inputting external audio and video signals. Normal TV / Cable / external signal line selection method of a. The normal TV / cable TV according to claim 1, wherein the first step of checking a user's input selection is to automatically switch to a next predetermined mode by checking a current display broadcast mode state upon inputting key data of a remote controller. How to select external line signal.