Apparatus for receiving an AM stereophonic signal

Details Apparatus for receiving an AM stereophonic signal Apparatus for receiving an AM stereophonic signal

1980-11-21

1982-11-09

Pellinen, A. D.

179 1GM, H04H 500

Patent

active

043586384

ABSTRACT:
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 demodulated. 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 information is demodulated.

REFERENCES:
patent: 3980832 (1976-09-01), Nakamura et al.
patent: 4169968 (1979-10-01), Parker
patent: 4170716 (1979-10-01), Hilbert et al.
patent: 4192968 (1980-03-01), Hilbert et al.
patent: 4218586 (1980-08-01), Parker et al.

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