How to control the screen and the voice in weak signal or weak signal of television

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a television receiver, and more particularly, to a method for controlling screen noise and audio noise generated in a channel having no input signal at the time of channel UP / DOWN switching. When the input signal is a weak signal or a silent signal, there is almost no input signal (SYNC). Therefore, the automatic gain control voltage (AGC voltage) detected by the tuner is detected up to almost 5V. According to the present invention, when the input automatic gain control voltage (AGC voltage) is detected and corresponds to a weak signal or no signal according to the intensity of the voltage, the desktop of the television is displayed in green or blue (Blue Back) The present invention is directed to a method for reducing screen noise and noise noises even in the absence of a signal or a weak signal by lowering the sound level to reduce the noise. In order to perform blue back processing in the weak signal or no signal according to the present invention, an OSD (On Screen Display) method is used to designate the entire screen as an OSD area so that only one color of blue (B) or green A method of outputting a blue back processing function when the main IC of the television has a built-in blue back processing function and displaying the same on the screen. A method for reducing speech noise in the weak signal or no signal according to the present invention comprises adjusting the prescale value of a speech processing IC of a television through a microcomputer to lower the voice level.