Stereo multiplex demodulator

Details Stereo multiplex demodulator Stereo multiplex demodulator

1989-06-26

1990-06-12

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

H04H 500

Patent

active

049339729

ABSTRACT:
A composite stereo signal comprised of a modulated signal modulated by a sum signal which is the sum of left and right channel audio signals and a difference signal which is the difference between the left and right channel audio signals, and a pilot signal synchronized with the modulated signal, has the left and right channel audio signals demodulated therefrom by a stereo multiplex demodulator that includes a phase-locked loop (PLL) circuit for forming a sine wave signal synchronized with the pilot signal and having a frequency equal to a subcarrier frequency of the modulated signal, and a multiplying circuit for multiplying the composite stereo signal and the sine wave signal to generate the demodulated left and right channel audio signals.

REFERENCES:
patent: 4164624 (1979-08-01), Ogita
patent: 4399324 (1983-08-01), Ishida et al.
patent: 4539697 (1985-09-01), Ishida et al.
patent: 4817150 (1989-03-01), Filliman

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