Receiver for compatible AM stereo signals

Details Receiver for compatible AM stereo signals Receiver for compatible AM stereo signals

1977-09-27

1980-03-11

Olms, Douglas W.

H04H 500

Patent

active

041929683

ABSTRACT:
An improved AM stereo receiver for receiving broadcast signal having the form (1+L+R)cos(.omega..sub.c t+.phi.) where .phi. is arc tan(L-R)/(1+L+R). The sum signal (L+R) is demodulated in an envelope detector and coupled to a matrix. The uncorrected difference signal is demodulated in a synchronous detector, a corrector circuit derives the correction factor, and a divider circuit provides the corrected difference signal. During tuning, and until a PLL is locked on the carrier frequency, the receiver is locked into the monophonic mode and tuned on the monophonic signal. When the PLL locks, the difference signal is coupled through to the matrix for stereophonic mode operation.

REFERENCES:
patent: 3068475 (1962-12-01), Avins
patent: 3080453 (1953-03-01), Avins
patent: 3534172 (1970-10-01), Weeda
patent: 3823268 (1974-07-01), Modafferi
patent: 4018994 (1977-04-01), Kahn
patent: 4037057 (1977-07-01), Ogita et al.

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