H - Electricity – 04 – N
Patent
H - Electricity
04
N
325/73
H04N 1/16 (2006.01) H04H 5/00 (2006.01)
Patent
CA 1147394
APPARATUS FOR RECEIVING AN AM STEREOPHONIC SIGNAL ABSTRACT OF THE DISCLOSURE Apparatus for receiving an AM stereophonic signal of the type having monaural information represented by amplitude modulations of a signal carrier and stereophonic information represented by phase modulations of the signal carrier. A reference signal generator generates a reference signal that is synchronized with the signal carrier of the received AM stereophonic signal. In one embodiment, the reference signal generator is a phase-locked loop which generates a reference carrier whose frequency is substantially equal to the signal carrier frequency and whose phase is locked to a predetermined signal carrier phase. An amplitude limiter limits the AM stereophonic signal to remove amplitude modulations of the signal carrier and thereby produce an amplitude-limited signal carrier. A demodulator demodulates the information represented by the AM stereophonic signal, and a detector is provided to detect if the stereophonic information will be properly modulated. A switching arrangement is controlled by the detector to supply the reference signal to the demodulator, whereby the stereophonic information is demodulated, or to supply the amplitude-limited signal carrier to the demodulator, whereby the monaural infor- mation is demodulated.
365021
Numata Norio
Yokoya Satoshi
Gowling Lafleur Henderson Llp
Sony Corporation
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