KR970029581A - Method switching system and its switching method in VCC using PAL / SECAM dual system - Google Patents

Abstract

The present invention provides a method for switching between PAL and SECAM broadcast signals on a menu screen displayed on a television monitor, and a PAL / SECAM dual system for selecting a test signal. It is about.

According to the present invention, when a selection signal for selecting a menu screen is input, a broadcast video signal received through a tuner built in VRC and video data for a menu screen drawn from a memory block are mixed and displayed on a monitor of a television. ; When a selection signal for selecting a PAL or SECAM method is input while the menu screen is displayed on the monitor, selecting an RF modulation output corresponding to the selected method; If there is no test signal input by checking the input of the test signal selected by the user, the video data mixed with the broadcast video signal and the menu screen image data is RF-modulated at a frequency corresponding to the selected method and displayed on the monitor. When the test signal is input, the user modifies the image data by mixing the broadcast video signal, the image data for the menu screen, and the image data for the test signal with the RF signal at a frequency corresponding to the selected method. It is possible to greatly improve the usability by easily and simply switching between PAL method and SECAM method, and to improve the reliability of generating test signals for distinguishing receiving systems of broadcast signals.

Description

Method switching system and its switching method in VCC using PAL / SECAM dual system

As this is a public information case, the full text was not included.

1 is a block diagram of a system switching system in V-Cal employing a PAL / SECAM dual system according to a preferred embodiment of the present invention.

Claims (2)

A method of switching in a V-Cal employing a PAL / SECAM dual system which modulates a video signal in a broadcast signal received through a tuner to a selected frequency and provides a television with a monitor via a cable. A video signal processing block (10) for processing a video signal of the broadcast signal received through the tuner as a displayable signal; A memory block (30) for storing the image data for the menu screen and the image data for the test signal which can be displayed on the monitor of the television according to a user's selection signal; Image data provided from the image signal processing block 10 via the switching block 40 and image data of the menu screen provided from the memory block 30 by user selection and / or test signal image data. Image synthesizing / switching block 50 for mixing the images; The switching is performed based on a switching control signal based on a user's selection signal to provide an image signal from the image signal processing block 10 to the image synthesis / switching block 50 or to the RF modulation block 60. Switching block 40; The switching control signal for switching the contact of the switching block is generated based on an operation signal from the user for selecting the PAL or SECAM method and the image data for the menu screen stored in the memory block 30 is fetched. By providing to the image synthesizing / switching block 50 and simultaneously generating an ice switching signal for selecting the PAL or SECAM method, and storing the test signal stored in the memory block 30 in a test mode according to a user's operation. A microcomputer 20 for extracting image data and providing the image data to the image synthesis / switching block 50; And based on the method switching signal for selecting the PAL method or the SECAM method provided from the microcomputer 20, RF-modulating the broadcast video signal provided through the switching block 40 to a frequency according to a selected method, The RF modulation block which RF modulates a broadcast video signal mixed with the menu screen image data and / or the test signal image data provided from the image synthesizing / switching block 50 at a frequency according to a selected scheme and provides the television to the television; The PAL / SECAM system dual system consisting of (60) is adopted, the system switching system in BC. V-Cal adopts the PAL / SECAM dual system which modulates the video signal among the broadcast signals received through the tuner to the RF frequency corresponding to the PAL or SECAM method selected according to the user's operation and provides the television with a monitor through a cable. A method for switching a method in a system according to the present invention, the method comprising: a memory block (30) for storing image data for menu screen and test signal image data that can be displayed on the monitor according to a user's operation; A first step of mixing the received broadcast video signal with the image data for the menu screen drawn from the memory block 30 when the selection signal for selecting the input signal is input; Selecting the RF modulation output corresponding to the selected method when the selection signal for selecting the PAL or SECAM method is input while the menu screen is displayed on the monitor; If there is no input of the test signal by checking the input of the test signal selected by the user, the image data in which the broadcast video signal and the image data for the menu screen are mixed are RF-modulated to a frequency corresponding to the selected method. A third step of displaying on a monitor; And if the test signal is inputted as a result of the check in the third step, RF modulation of the video data mixed with the broadcast video signal, the image data for the menu screen, and the image data for the test signal at a frequency corresponding to the selected method. And a PAL / SECAM dual system comprising a fourth step of displaying on the monitor. ※ Note: The disclosure is based on the initial application.