Noise canceling system

Details Noise canceling system Noise canceling system

1996-10-18

1998-11-03

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within duct

381 7114, 381 942, H03B 2900, A61F 1106

Patent

active

058320954

ABSTRACT:
Two microphones spaced along a duct of an air conditioning system provide inputs to circuitry whereby the noise being generated is distinguished from reflected noise. The circuitry imposes a time delay corresponding to the time required for generated noise to pass from the upstream microphone to a canceling speaker. The canceling speaker is driven by the circuitry, subject to the time delay, such that noise at the speaker is canceled by the appropriately driven speaker. In a preferred embodiment movement of the speaker is sensed whereby the actual sound being produced can be compared with the sound required by the canceling speaker driving signal.

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