Patent ID: 7227591

Claim:
A combined television (TV) and frequency modulation (FM) radio receiver, comprising: a tuner that selects TV band signals or FM radio band signals and converts the selected TV band signals into intermediate frequency (IF) signals if the TV band signals are selected and converts the selected FM radio band signals into primary sound IF signals if the FM radio band signals are selected; an IF processor that generates first local oscillating signals if a current mode is a TV mode and generates second local oscillating signals if the current mode is an FM radio mode, and converts the IF signals into first baseband signals and first secondary sound IF signals, and/or converts the primary sound IF signals into second secondary sound IF signals; a video demodulator that extracts video signals from the first baseband signals output from the IF processor; an audio demodulator that extracts TV audio signals from the first secondary sound IF signals according to TV sound mode data and/or FM audio signals from the second secondary sound IF signals output from the IF processor according to FM radio mode data; and a controller that controls the selection of the tuner based on TV channel selection data or FM radio channel selection data, controls the IF processor to generate the first local oscillating frequency signals if the current mode is the TV mode and generate second local oscillating frequency signals if the current mode is the FM radio mode, and applies the TV sound or FM radio mode data to the audio demodulator.