FM Stereo demodulation circuit

Details FM Stereo demodulation circuit FM Stereo demodulation circuit

1982-08-17

1984-12-18

Schreyer, Stafford D.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

329167, 381 3, H04H 500

Patent

active

044894309

ABSTRACT:
A pulse position modulated (PPM) signal is derived from an input FM signal, and first and second switching signals are derived which are opposite in phase and correspond to alternating half cycles of the PPM signal. First and second opposite phase subcarrier signals are derived synchronized to the pilot signal in the input FM signal, and various combinations of the switching and subcarrier signals are multiplied together and the multiplication products combined to obtain left and right channel outputs.

REFERENCES:
patent: 3514719 (1970-05-01), Rhodes
patent: 4069398 (1978-01-01), Fujie
patent: 4334125 (1982-06-01), Inoue
patent: 4362906 (1982-12-01), Ishida
patent: 4404430 (1983-09-01), Ogita

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