Patent ID: 6353463
Filing Date: 2002-03-05
Classification: H04N

Abstract:
A TV receiver for receiving and signal-processing an analog broadcasting signal and a digital broadcasting signal, the TV receiver comprising:a dual tuner, for selecting a channel of a corresponding broadcasting mode among the received broadcasting signals according to an applied channel select control signal, controlling the gain of a radio frequency (RF) signal of the selected channel according to an applied automatic gain control signal, and converting the gain-controlled RF signal into an intermediate frequency (IF) signal; a signal distributor for distributing the IF signal output from the dual tuner according to the broadcasting mode; an analog processor for amplifying and detecting the analog IF signal output from the signal distributor to be restored into an analog composite video signal, and generating an analog automatic gain control signal AGCa for controlling the RF gain of the dual tuner in response to the level of the restored signal; a digital processor for amplifying and detecting the digital IF signal output from the signal distributor to be restored into a baseband digital video signal, and generating a digital automatic gain control signal AGCd for controlling the RF gain of the dual tuner in response to the level of the restored signal; a switching portion for selecting one of the automatic gain control signals AGCa and AGCd output from the respective processors according to an applied AGC select signal, and supplying the selected automatic gain control signal to the dual tuner; and a controller for applying the channel select control signal of each broadcasting mode to the dual tuner and applying the AGC select signal of each broadcasting mode to the switching portion, in response to a user request.