Silencer attenuating a noise from a noise source to be ventilated and a method for active control of its noise attenuation system
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United States of America Patent
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Oct 19, 1993
Grant Date -
N/A
app pub date -
Apr 26, 1991
filing date -
May 1, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A silencer attenuating a noise from a noise source to be ventilated of this invention comprises a machine compartment with a one-dimensional duct configuration whose sectional dimension is sufficiently small in comparison with the wavelength of the noise to be attenuated, a compressor and/or other machinery disposed within the machine compartment, an opening for dissipation of heat as disposed in a wall of the machine compartment and opening in a direction generally perpendicular to the direction of advance of sound within the machine compartment, a vibration pickup for detecting the vibration of the machinery corresponding to the output noise of the machinery, and a control circuit for processing output signals from the vibration pickup to drive a sound generator such as a speaker. The sound generator outputs a controlling signal dependent on the machine noise to cancel the noise about to emerge from the machine compartment.
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