KR970025037A - Apparatus and method for eliminating disturbance signal using automatic gain control (AGC) voltage - Google Patents

Abstract

The present invention relates to an apparatus and method for removing interference signal using an automatic gain control (AGC) voltage to remove an FM interference signal using an automatic gain control (AGC) voltage when receiving a low frequency band broadcasting channel.

In the conventional TV jamming signal removing device, when the 6th channel is received, the viewer needs to directly adjust the trap point by using the remote control for the jamming signal generated by the FM broadcasting signal, and removes the FM jamming signal on the composite video signal. Therefore, there is an uncomfortable problem of removing the jamming signal over the whole band of the jamming signal and setting it by memory.

In order to solve the conventional problems, the present invention is to detect the automatic gain control (AGC) voltage, and the AGC voltage is detected for a predetermined time, especially when channel 6, which is a low frequency broadcast that is affected by the FM interference signal, is tuned. By controlling the RF gain by controlling the RF gain, the tuner unit removes the FM interference signal, thereby preventing the high frequency distortion so that the viewer can watch the broadcast more clearly.

Description

Apparatus and method for eliminating disturbance signal using automatic gain control (AGC) voltage

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

2 is a block diagram of an apparatus for removing interference signal using an automatic gain control (AGC) voltage of the present invention.

Figure 3 is a flow chart showing the process of the interference signal removal method using the automatic gain control (AGC) voltage of the present invention.

Claims (2)

A tuner unit 10 for converting a signal received from the antenna 1 into an intermediate frequency and outputting the converted frequency; An intermediate frequency processor 20 for processing an intermediate frequency output from the tuner unit 10 and a chroma unit 30 for displaying an image signal output from the intermediate frequency processor 20 through a CPT, and for detecting a synchronization signal. The synchronization signal detector 40, the fine-tuned voltage amplifier 60 amplifies the AFT voltage detected by the intermediate frequency processor 20, and outputs the amplified voltage to the microcomputer 5, and the synchronization signal detector 40 detects the synchronization signal. Automatic gain control (AGC) voltage, characterized in that consisting of a microcomputer 50 for controlling the RF gain of the tuner unit 10 by comparing the AFT voltage applied from the synchronization signal and the fine adjustment voltage amplifier 60 Disturbance signal removal device using. When the TV power is turned on or the channel is switched, the PLL data is output and the operation is performed. The first process of determining whether there is a synchronization signal and the PLL data are continuously output when there is no synchronization signal, and the detected AFT is detected. In the second process of determining whether the voltage is above the set reference voltage (2,42), and if the second process determines that the AFT voltage is not higher than the reference voltage, PLL data is continuously output to perform fine tuning. A third process of determining whether the switched channel is channel 6 and a fourth process of waiting for a predetermined time (t1) and muting the AGC voltage for a predetermined time (t2) if the channel 6 is determined as the third process. Disturbance signal removal method using an automatic gain control (AGC) voltage, characterized in that made.