Receiver for compatible am stereo signals

Details Receiver for compatible am stereo signals Receiver for compatible am stereo signals

H - Electricity

04

H

325/73

H04H 5/00 (2006.01)

Patent

CA 1129965

AP-77868 A RECEIVER FOR COMPATIBLE AM STEREO SIGNALS ABSTRACT An improved AM stereo receiver for receiving broadcast signals having the form (1 + L + R)cos(.omega.ct + 0)where 0 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 cor- rection 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.

311084

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