Noise suppressor

Details Noise suppressor Noise suppressor

1992-06-08

1995-02-07

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, H03B 2900

Patent

active

053881605

ABSTRACT:
In a noise suppressor, a noise signal detected by a first detector is inputted to an adaptive filter and a FIR filter. An output signal of the adaptive filter is reproduced by a speaker. The signal reproduced by the speaker and a noise signal from a noise source are detected by a second detector. The signal detected by the second detector is band-limited by a filter circuit and sent to a LMS computing circuit. The LMS computing circuit updates a coefficient of the adaptive filter so as to minimize an output signal of the filter circuit in response to an output signal of the FIR filter and an output signal of the filter circuit.

REFERENCES:
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4586153 (1986-04-01), Hobrough
patent: 4677676 (1987-06-01), Eriksson
patent: 4837834 (1989-06-01), Allie
patent: 4914706 (1990-04-01), Krause
patent: 4965832 (1990-10-01), Edwards et al.
patent: 5170433 (1992-12-01), Elliot et al.
"Adaptive Digital Techniques For Audio Noise Cancellation", Paul, James E., IEEE Circuits & Systems, vol. 1, No. 4, Dec., 1979.
40th IEEE Vehicular Technology Conference, May 1990, Orlando, pp. 48-53, R. A. Goubran et al., "Acoustic Noise Suppression Using Regressive Adaptive Filtering".

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