Active noise control system using phased-array sensors
First Claim
1. An active noise control system, comprising:
- sensor means for detecting noise waves and for providing noise signals indicative of said waves;
beam means for receiving said noise signals, for causing said sensor means to have an acoustic response profile which is selectively responsive to solely a predetermined quiet region remote from said sensor means, and for providing a beam signal indicative of noise at said quiet region; and
noise control means responsive to said beam signal for providing an anti-noise signal which substantially cancels said noise at said quiet region.
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Accused Products
Abstract
An active noise control system is provided with a plurality of error sensor arrays 50,77 which provide signals on lines 64-74,90-100 to beam forming and beam steering logic 76 which cause the arrays 50,77 to exhibit acoustic response profiles 104,106, respectively. The profiles 104,106 intersect in a predefined region 116 to be quieted. The logic 76 provides signals on lines 118, one for each region to be quieted, to active noise control (ANC) logic 20 which also receives inputs from feedforward sensing microphones 10 and provides output signals to acoustic speakers 24 which generate anti-noise 26 to cancel the noise in the quiet region 116. The quiet region 116 may be selectively positioned to any region in the room by steering the beams 104,108. Alternatively, the system may have a plurality of distributed sensors which, when taken together, have an overall maximum (main lobe) acoustic response at a predetermined selectable quiet region.
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Citations
11 Claims
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1. An active noise control system, comprising:
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sensor means for detecting noise waves and for providing noise signals indicative of said waves; beam means for receiving said noise signals, for causing said sensor means to have an acoustic response profile which is selectively responsive to solely a predetermined quiet region remote from said sensor means, and for providing a beam signal indicative of noise at said quiet region; and noise control means responsive to said beam signal for providing an anti-noise signal which substantially cancels said noise at said quiet region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification