Communications systems

Details Communications systems Communications systems

1983-01-27

1987-06-09

Dwyer, James L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, G10L 100

Patent

active

046726748

ABSTRACT:
A noise cancelling system comprises two conventional noise cancelling microphones (1,2) spaced apart by a distance of one of up to 10 cms with use of the microphones (1) being arranged to be close to the mouth of a user for reception of speech and the other microphone (2) spaced therefrom and used as a reference microphone. The signals from the microphones are processed by means (7) which use a batch of signals derived from the reference microphone (2) to modify a signal derived from the speech microphone in accordance with the Widrow algorithm known in the art. This system enables effective noise cancellation to be achieved with a delay of only 0.1 sec.

REFERENCES:
patent: 3995124 (1976-11-01), Gabr
patent: 4066842 (1978-01-01), Allen
patent: 4334740 (1982-06-01), Wray
Widrow et al, "Adaptive Noise Cancelling: Principles and Applications", IEEE Proceedings vol. 63, No. 12, Dec. 1973, p. 1692.
Paul, J. E., "Automatic Digital Audio Processor", IEEE Catalog, No. 77CH1315-1, 1978, pp. 253-258.

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