Electrical audio signal processing systems and devices – Noise or distortion suppression
Patent
1989-04-20
1990-09-11
Isen, Forester W.
Electrical audio signal processing systems and devices
Noise or distortion suppression
H04R 300
Patent
active
049568671
ABSTRACT:
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.
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Greenberg Julie E.
Peterson Patrick M.
Zurek Patrick M.
Engellenner Thomas J.
Isen Forester W.
Massachusetts Institute of Technology
Powsner David J.
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