Stereo demodulator circuit

Details Stereo demodulator circuit Stereo demodulator circuit

1980-02-06

1982-06-08

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, 329167, H04H 500

Patent

active

043341250

ABSTRACT:
In a stereo demodulator circuit, there is provided a phase-locked loop in which a comparison signal is produced by frequency-dividing an oscillation signal of an oscillator, and the phase of the comparison signal is compared with the phase of the pilot signal to phase-lock the phase of the oscillation signal and the phase of the pilot signal. The output signal of the oscillator is frequency-divided to produce a first switching signal. The first switching signal and a composite signal are supplied to a first decoder at which left and right channel signals are separated. The output of the oscillator is also frequency-divided to produce a second switching signal having a frequency which is three times the sub-carrier frequency. The composite signal and the second switching signal are supplied to a second decoder at which the left and right channel signals are separated. Outputs of the first and second decoders are added to eliminate a beat signal which results from the third harmonic of the sub-carrier signal and an unwanted signal contained in the composite signal.

REFERENCES:
patent: 3965302 (1976-06-01), Kurata
patent: 3980832 (1976-09-01), Nakamura et al.
patent: 4037055 (1977-07-01), Sato et al.
patent: 4056685 (1977-11-01), Burgyan

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