Fan noise canceller

Details Fan noise canceller Fan noise canceller

1997-07-09

1999-11-30

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

From appliance

381 719, 381 7114, 415119, H03B 2900, A61F 1106, F01D 2504

Patent

active

059956321

ABSTRACT:
A fan noise canceller includes a rotation information detecting device for detecting noise information of a fan, a band-pass filter for extracting the blade passing frequency from the noise information, an output control device for controlling the amplitude and phase of the blade passing frequency signal of the extracted noise information, and a cancelling loud-speaker for converting the output of the output control device into a sound signal.

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G.H. Koopmann et al., "Active Source Cancellation of the Blade Tone Fundamental and Harmonics in Centrifugal Fans," Journal of Sound and Vibration (1988) vol. 126, Oct. 22, 1988, pp. 209-220.

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