Adaptive filtering means for an automatic sound controlling appa

Details Adaptive filtering means for an automatic sound controlling appa Adaptive filtering means for an automatic sound controlling appa

1992-07-20

1995-04-04

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

A61F 1106, H03B 2900

Patent

active

054044090

ABSTRACT:
An automatic sound controlling apparatus including a first adaptive filtering means that forms a compensating signal for canceling a stationary sound, a signal producing means that produces a predetermined shape signal based on a timing signal with respect to a sound, a second adaptive filtering means that forms a compensating signal for canceling a fluctuating sound by the predetermined shape signal, whereby in the case that a sound period changes sharply, an output signal of the second adaptive filtering means is output in stead of the first adaptive filtering means.

REFERENCES:
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patent: 4677676 (1987-06-01), Eriksson
patent: 4677677 (1987-06-01), Eriksson
patent: 5022082 (1991-06-01), Eriksson et al.
patent: 5029218 (1991-07-01), Nagayasu
patent: 5093864 (1992-03-01), Sekiguchi et al.
patent: 5111507 (1992-05-01), Nakaji
Eriksson, L. J. "Recursive Algorithms for Active Noise Control", Apr. 4-11, 1991, pp. 137-146.

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