Apparatus and method for cooling with noise control

Details Apparatus and method for cooling with noise control Apparatus and method for cooling with noise control

1994-01-26

1995-09-19

Coles, Sr., Edward L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

H04B 500

Patent

active

054523621

ABSTRACT:
An acoustic duct using active noise cancellation to reduce the acoustic signature of a computer system is disclosed. The acoustic duct is coupled to a vent of a thermal box that encloses the components (the heat source) and the fan cooling system (the noise source) of the computer system. The acoustic duct is constructed as an acoustic waveguide such that the flow of air through the thermal box is not impeded. An anti-noise circuit that generates an anti-noise signal is positioned near the vent such that the anti-noise signal and the noise signal generated by the noise source propagate through and out of the acoustic duct in the same mode.

REFERENCES:
patent: 4989252 (1991-01-01), Nakanishi et al.

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