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OwnerMasanori Sugahara, Keiji Nakanishi +1inventors
InventorsMasanori Sugahara, Keiji Nakanishi, Yasuyuki Sekiguchi
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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.
A silencer attenuating noise from a noise source requiring ventilation, the silencer comprising:
A silencer according to claim 13, wherein the transfer function applying means is for applying a transfer function G defined by:
A silencer attenuating a noise from a noise source to be ventilated, comprising:
Dependencies are inferred from the claim text.