Communications systems
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United States of America Patent
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Jun 9, 1987
Grant Date -
N/A
app pub date -
Jan 27, 1983
filing date -
Jan 27, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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