Multi-actuator system for active sound and vibration cancellatio

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Counterwave generation control path

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381 7112, 708322, H03B 2900, A61F 1106

Patent

active

059784890

ABSTRACT:
A multi-actuator system for active sound and vibration cancellation utilizes an LMS type algorithm having an adaptive filter. However, the error signal rather than the input is filtered through an adjoint filter of the error channel to drive an adaptive filter which in turn drives, for example, a loudspeaker to provide destructive interference for noise cancellation. The adjoint filter is realized by converting a standard filter's flow direction, such as a finite impulse response filter, swapping branching points with summing junctions and unit delays with unit advances. For multiple-input-output systems, computational complexity is significantly reduced.

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Elliott, et al., "Active Noise Control," IEEE Signal Processing Magazine, pp. 12-36 (Oct. 1993).

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