Patent ID: 8218092

Claim:
A television receiver, comprising: a tuner having an input to receive radio frequency signals that include modulated analog television signals and modulated digital television signals, and an output to provide the modulated analog television signals and the modulated digital television signals at an intermediate frequency; a bandpass filter coupled to an intermediate frequency amplifier, the bandpass filter having an input coupled to the output of the tuner, and the intermediate frequency amplifier having an output, the bandpass filter and the intermediate frequency amplifier providing a singular signal path to filter and amplify both the modulated analog television signals and the modulated digital television signals at the intermediate frequency; and a demodulator having a singular input coupled to the output of the intermediate frequency amplifier and having a plurality of outputs, the plurality of outputs including a first output to provide demodulated analog television signals in response to the output of the tuner providing modulated analog television signals at the intermediate frequency and a second output to provide demodulated digital television signals in response to the output of the tuner providing modulated digital television signals at the intermediate frequency, the demodulator including an automatic gain controller coupled to the tuner and the intermediate frequency amplifier and at least one tunable filter having an input coupled to the singular input and an output coupled to the automatic gain controller, the automatic gain controller providing a first gain control signal to the tuner to control a gain of the tuner and providing a second gain control signal to the intermediate frequency amplifier to control a gain of the intermediate frequency amplifier, and the at least one tunable filter configured to filter audio signals from the modulated analog television signals and provide video portions of the modulated analog television signals at the output of the at least one tunable filter; wherein the first and second gain control signals are based upon a signal strength indication provided by the tuner and a peak signal level of the video portions of the modulated analog television signals at the output of the at least one tunable filter in response to the output of the tuner providing modulated analog television signals at the intermediate frequency, and wherein the first and second gain control signals are based upon the signal strength indication provided by the tuner and an energy level of the modulated digital television signals in response to the output of the tuner providing modulated digital television signals at the intermediate frequency.