Noise reduction for stereophonic FM signals by high-speed sampli

Details Noise reduction for stereophonic FM signals by high-speed sampli Noise reduction for stereophonic FM signals by high-speed sampli

1984-03-26

1986-03-04

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

328165, 455223, 330149, H04H 500

Patent

active

045743908

ABSTRACT:
In a noise reduction circuit for reception of stereophonic FM signals in which the demodulated signal is chopped at twice the pilot frequency for separation between left- and right-channel signals, the demodulated signal is sampled by a first sample-and-hold circuit in response to the output of the noise detector to store that portion of the signal which appeared immediately prior to the occurrence of an impulse noise. The demodulated signal is also sampled by a second sample-and-hold circuit at a frequency twice the pilot frequency to eliminate a noise which might arise due to the chopping of the demodulated signal. A signal is derived from the outputs of the first and second sample-and-hold circuits that indicates the slope ratio of the demodulated signal at the moment that occurred immediately prior to the impulse noise. The slope ratio signal is applied to a linear integrator to generate a compensating voltage which is summed with the signal sampled by the first sample-and-hold circuit at the level which occurred immediately prior to the occurrence of the impulse noise.

REFERENCES:
patent: 3947636 (1976-03-01), Edgar
patent: 4246441 (1981-01-01), Sugai et al.
patent: 4306112 (1981-12-01), Ueno
patent: 4311963 (1982-01-01), Watanabe et al.
patent: 4419541 (1983-12-01), Kishi et al.
patent: 4430754 (1984-02-01), Ishigaki
patent: 4480335 (1984-10-01), Kishi
patent: 4491957 (1985-01-01), Kamalski

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