Multiple system AM stereo receiver and pilot signal detector

Details Multiple system AM stereo receiver and pilot signal detector Multiple system AM stereo receiver and pilot signal detector

1981-08-31

1984-01-17

Pellinen, A. D.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

307524, 328138, H04H 500

Patent

active

044267282

ABSTRACT:
A stereo receiver is described which is capable of receiving any two or more of the five currently proposed AM stereo system broadcast signals. The multisystem receiver includes circuitry which is used in various configurations to demodulate the stereo signal components from broadcast signals of any one of two or more of the proposed systems. Selection of appropriate elements of the receiver's circuitry for demodulating any one of the received signals is performed automatically in response to the detection of the presence of a corresponding pilot signal which is unique for each of the five different AM stereo systems that have been proposed. The receiver includes apparatus which detects the presence of such pilot signals and controls the automatic switching of such receiver circuitry. Also described is the application of such apparatus for reliably detecting the presence of the desired pilot signal in a single system stereo receiver.

REFERENCES:
patent: 2521752 (1950-09-01), Schwarz
patent: 3555435 (1971-01-01), Vosteen
patent: 3949401 (1976-04-01), Hegeler et al.
patent: 4072931 (1978-02-01), Davis
patent: 4109197 (1978-08-01), Lang et al.
patent: 4199761 (1980-04-01), Whyte et al.
patent: 4227255 (1980-10-01), Carrick et al.
patent: 4286221 (1981-08-01), Takaoka
patent: 4344038 (1982-08-01), Streeter

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