H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/73
H04B 1/16 (2006.01) H04H 5/00 (2006.01)
Patent
CA 1167110
ABSTRACT OF THE DISCLOSURE 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.
408813
Johnson Douglas S. Q.c.
Kahn Leonard R.
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