04956867 is referenced by 122 patents and cites 21 patents.

The invention provides an adaptive noise cancelling apparatus which operates to overcome a problem encountered in conventional noise cancelling circuitry when the signal-to-noise ratio at the sensor array is high--to wit, that the target signal is degraded, leading to poorer intelligibility. An apparatus constructed in accord with the invention selectively inhibits the adaptive filter from changing its filter values in these instances and, thereby, prevents it from generating a noise-approximating signal that will degrade the target component of the output signal.

Title
Adaptive beamforming for noise reduction
Application Number
7/341139
Publication Number
4956867
Application Date
April 20, 1989
Publication Date
September 11, 1990
Inventor
Patrick M Peterson
Cambridge
MA, US
Julie E Greenberg
Farmington Hills
MI, US
Patrick M Zurek
Arlington
MA, US
Agent
David J Powsner
Thomas J Engellenner
Assignee
Massachusetts Institute of Technology
MA, US
IPC
H04R 3/00
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