Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent
1988-07-13
1989-09-12
Isen, Forester W.
Electrical audio signal processing systems and devices
Noise or distortion suppression
Interpolation
381 15, 381 13, 455266, 455340, 333173, H04B 1500
Patent
active
048667790
ABSTRACT:
An audio processor for adaptively rejecting undesired noise and interference in an audio input which includes a variable Q, 10 kHz switched capacitor notch filter. The Q of the notch filter is varied by a control loop responsive to the 10 kHz content of the audio signal. The notch filter includes a summer section that is clocked at a predetermined frequency, and an integrator section which is clocked at a multiple of the predetermined frequency in order to prevent center frequency variation with changes in Q of the notch filter.
REFERENCES:
patent: 3795877 (1974-03-01), Poole
patent: 4518935 (1985-05-01), Van Roermund
patent: 4520283 (1985-05-01), Sasaki et al.
patent: 4680795 (1987-07-01), Ecklund
Anderson Fred J.
Kennedy Richard A.
Stang Marvin G.
Zarabadi Seyed R.
Delco Electronics Corporation
Duke A. Frank
Isen Forester W.
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