Electronic noise attenuation system

Details Electronic noise attenuation system Electronic noise attenuation system

1989-02-22

1991-05-21

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

050182021

ABSTRACT:
An electronic noise attenuation system for attenuating a sound wave propagated from a source of noise by generating another sound wave 180.degree. out of phase and having the same sound pressure with the propagated sound wave from electro-mechanic transducer means disposed in a propagation passage of sound waves. In the electronic noise attenuation system, a drive signal for drive the electro-mechanic transducer means is generated in accordance with output signals respectively output from upstream-side and downstream-side mechano-electric transducer means respectively disposed in the propagation passage with the electro-mechanic transducer means therebetween. Namely, the drive signal is created by performing an operation on a difference signal between the output signal of the upstream mechano-electric transducer means and the drive signal according to a given transfer function. Also, the transfer function is determined in accordance with the difference signal and the output signal of the downstream mechano-electric transducer means.

REFERENCES:
patent: 4677676 (1987-06-01), Eriksson
A Variable Step (VS) Adaptive Filter Algorithm, by Harris et al., IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-34, No. 2 (Apr. 1986).
Adaptive Signal Processing, by Widrow and Stearns, Chapter 11, pp. 270-301.

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