Patent ID: 8464307

Claim:
A signal receiving circuit adapted to generate an output signal based on a radio frequency signal, said signal receiving circuit comprising: a tuner for generating a tuned signal based on the radio frequency signal; and a demodulator for generating the output signal based on the tuned signal, said demodulator comprising: an analog-to-digital converter for generating a digital signal based on the tuned signal; a frequency down-converter for generating a frequency down-converted signal based on the digital signal; an audio processing circuit for generating a demodulated audio signal by demodulating the frequency down-converted signal in an audio processing mode; a video processing circuit for generating a demodulated video signal by demodulating the frequency down-converted signal in a video processing mode; an interface circuit for generating the output signal based on one of the demodulated audio signal and the demodulated video signal; a filtering unit for generating a filtered signal based on the frequency down-converted signal; and a rate converting unit for generating a converted signal based on the filtered signal; wherein said audio processing circuit generates the demodulated audio signal based on the converted signal in the audio processing mode, and said video processing circuit generates the demodulated video signal based on the converted signal in the video processing mode; and a mode control circuit coupled to said demodulator for controlling said demodulator to operate according to one of the audio processing mode and the video processing mode.