Multi-channel active control system and method for the reduction of tonal noise from an axial fan
First Claim
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1. A multi-channel active noise control system comprising:
- loudspeakers arranged relative to a tonal noise source;
at least one microphone for generating at least one error signal; and
an adaptive controller coupled to the loudspeakers and the at least one microphone, wherein the adaptive controller drives each of the loudspeakers with amplitudes and phases selected to minimize radiated acoustic power in response to the at least one error signal.
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Abstract
A multi-channel active noise control system and method of reducing tonal noise emanating from a tonal noise source are disclosed. The system may include an adaptive controller, a plurality of loudspeakers driven by the loudspeaker, one or more microphones for generating one or more error signals to feedback to the adaptive controller and optionally a reference signal source to provide the adaptive controller with frequency information associated with the tonal noise source. The system and method of the present invention are applicable to any tonal noise source, including but not limited to axial fans.
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Citations
16 Claims
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1. A multi-channel active noise control system comprising:
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loudspeakers arranged relative to a tonal noise source;
at least one microphone for generating at least one error signal; and
an adaptive controller coupled to the loudspeakers and the at least one microphone, wherein the adaptive controller drives each of the loudspeakers with amplitudes and phases selected to minimize radiated acoustic power in response to the at least one error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of reducing tonal noise emanating from a tonal noise source, comprising:
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selectively arranging loudspeakers around the tonal noise source;
placing a plurality of microphones within an extreme near-field of the loudspeakers and the tonal noise source; and
driving amplitude and phase of each of the loudspeakers in response to signals generated by the plurality of microphones to reduce the tonal noise emanating from the tonal noise source. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification