Multiplex demodulation circuit

Details Multiplex demodulation circuit Multiplex demodulation circuit

1980-09-03

1983-08-16

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329167, H04H 500

Patent

active

043993249

ABSTRACT:
A multiplex demodulation circuit in which no band elimination filter is required for eliminating beating between the mixed signals and odd harmonics of the 38 KHz switching signal derived from the 19 KHz pilot signal. The FM detection signal is logarithmicly converted as is the 38 KHz subcarrier signal. The two logarithmically converted signals are added and then inversely logarithmically converted. The inversely logarithmically converted signal is added to the FM detection signal to produce the left channel signal while the inversely logarithmically converted signal is phase inverted then added to the FM detection signal to provide the right channel signal.

REFERENCES:
patent: 3219759 (1965-11-01), Dome

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