Quadrature multiplying four-channel demodulator

Details Quadrature multiplying four-channel demodulator Quadrature multiplying four-channel demodulator

H - Electricity

03

D

329/2

H03D 3/02 (2006.01) H04H 5/00 (2006.01)

Patent

CA 1067161

ABSTRACT OF THE DISCLOSURE A decoder is provided for a FM radio four- channel system having the usual 19 kHz pilot signal, a first subcarrier at 38 kHz, a second subcarrier in quadrature therewith, and another subcarrier at 76 kHz. The decoder of the present invention is a time division system wherein the 19 kHz pilot signal is doubled and the phase shifted 90°. This produces sins and cosine 38 kHz signals to provide a first pair of outputs, and each of these signals is inverted to provide a second pair of outputs. By properly adding the four outputs thus derived, switching signals are provided to decode the four channel information.

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