Adaptive noise reduction circuit for a sound reproduction system

Details Adaptive noise reduction circuit for a sound reproduction system Adaptive noise reduction circuit for a sound reproduction system

1992-02-27

1995-05-02

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 684, 381 182, H04B 1500

Patent

active

054127351

ABSTRACT:
A noise reduction circuit for a hearing aid having an adaptive filter for producing a signal which estimates the noise components present in an input signal. The circuit includes a second filter for receiving the noise-estimating signal and modifying it as a function of a user's preference or as a function of an expected noise environment. The circuit also includes a gain control for adjusting the magnitude of the modified noise-estimating signal, thereby allowing for the adjustment of the magnitude of the circuit response. The circuit also includes a signal combiner for combining the input signal with the adjusted noise-estimating signal to produce a noise reduced output signal.

REFERENCES:
patent: 3927279 (1975-12-01), Nakamura et al.
patent: 4433435 (1984-02-01), David
patent: 4548082 (1985-10-01), Engebretson
patent: 4658426 (1987-04-01), Chabries et al.
patent: 4833719 (1989-05-01), Carne et al.
patent: 5018202 (1991-05-01), Takahashi et al.
A self-adaptive noise filtering system (about 1987) by D. Graupe, J. Grosspietsch, and R. Taylor.
Adaptive Noise Cancelling: Principles and Applications (Dec., 1975) by B. Widrow, J. Glover, Jr., J. McCool, J. Kaunitz, C. Williams, R. Hearn, J. Zeidler, E. Dong, Jr., R. Goodlin.
Linear prediction: A Tutorial Review (Apr., 1975) by John Makhoul.
A Roundoff Error Analysis of the LMS Adaptive Algorithm (Feb., 1984) by Christos Caraiscos.

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