Active noise reduction device for electronic apparatus

Details Active noise reduction device for electronic apparatus Active noise reduction device for electronic apparatus

1994-08-15

1997-06-03

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, 181216, 181224, A61F 1106, H03B 2900

Patent

active

056362862

ABSTRACT:
An active noise reduction device for reducing the noise produced by cooling fans in a computer. The active noise reduction device comprises a duct mounted on the casing of the computer and having at least one air passage. One end of the passage communicates with the interior of the casing near the cooling fans and the other end is open to the atmosphere. A first microphone is arranged in the duct near the first end opening for detecting noise, and a second microphone is arranged in the duct near the second end opening. A speaker is arranged in the duct near the second opening, and a controller controls the speaker in response to outputs of the first and second microphones for reducing the noise produced in the casing. The speaker makes a sound having a reverse phase to that of the noise produced in the computer and the speaker sound is superimposed on the noise.

REFERENCES:
patent: 4672509 (1987-06-01), Speraw
patent: 4677677 (1987-06-01), Eriksson

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