Apparatus and method for providing automatic gain control

摘要

Signal processing apparatus ( 100 ) such as a television signal receiver provides automatic gain control (AGC) in a manner that avoids excessive tuner gain reduction and compensates for interference from both analog and digital signals. According to an exemplary embodiment, the signal processing apparatus ( 100 ) includes a tuner ( 10 ) operative to tune an RF signal to generate an IF signal. A first filter ( 20 ) is operative to filter the IF signal to generate a filtered IF signal. An AGC detector ( 30 ) is operative to enable generation of an AGC signal for the tuner ( 10 ) responsive to the filtered IF signal. The AGC detector ( 30 ) includes a second filter ( 35 ) operative to attenuate a predetermined carrier frequency.