Adaptive system for controlling noise generated by or emanating

Details Adaptive system for controlling noise generated by or emanating Adaptive system for controlling noise generated by or emanating

1992-04-28

1994-09-13

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

A61F 1106, H03B 2900

Patent

active

053475860

ABSTRACT:
An adaptive noise control system comprises a reference microphone (12) (FIG. 2) for generating a reference signal (x(t)) that is correlated with noise emanating from a primary noise source (10), secondary loud speaker sources (S.sub.1, S.sub.2, . . . S.sub.N) for generating a plurality of secondary sound waves, microphones (e.sub.1, e.sub.2, . . . e.sub.M) for detecting a plurality of far-field sound waves in a far-field of the primary noise source and generating a plurality of error signals (e.sub.1 (t), e.sub.2 (t), . . . e.sub.M (t)) each of which is indicative of the power of a corresponding far-field sound wave, and an adaptive controller (14) for controlling the secondary sources in accordance with the reference signal and the error signals so as to minimize the power in the far-field sound waves.

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