Method and apparatus for discriminating strong or weak signal in television full auto search

摘要

In the TV Full Auto Search according to the present invention, the method and apparatus for discriminating the strong signal or weak signal by recording the frequency of the input RF signal by the strong signal or the weak signal are very efficient when selecting a channel. The method of the present invention includes a first step of sequentially inputting a plurality of radio frequency (RF) signals for each channel, a second step of calculating an automatic gain control voltage of the RF signal input in the first step; And a third step of determining that the RF signal input for each channel is a weak signal or a strong signal when the automatic gain control voltage calculated in the second step is greater than or less than a preset value Th, respectively. A fourth step of dividing the frequency of the RF signal for each channel input in the first step into the memory unit according to the strong signal or the weak signal according to the determination result of the third step. It consists of. In the full TV search according to the present invention, the strong signal or weak signal differential recording apparatus sequentially outputs a plurality of RF (Radio Frequency) signals for each channel, and outputs the automatic gain control voltage of the input RF signal. An AGC unit for calculating and outputting an automatic gain control voltage), a detector for outputting a detection signal when the automatic gain control voltage provided from the AGC unit is greater than or equal to a preset value Th; When the sensing signal is provided to the sensing unit, the control unit outputs a first control signal, and vice versa, inputs an RF signal in the same way as the AGC unit, and inputs the RF signal. A converter converts the frequency of the signal into a digital signal and outputs the digital signal. The digital signal provided from the converter is sequentially recorded for each of a plurality of channels, and is provided from the controller. And a memory unit which writes separately according to the first and second control signals.