Adaptive analysis apparatus

Details Adaptive analysis apparatus Adaptive analysis apparatus

G - Physics

10

K

340/72

G10K 11/16 (2006.01) H03H 21/00 (2006.01)

Patent

CA 2015253

ABSTRACT Disclosed is an adaptive analysis apparatus having a signal channel adapted to sense an acoustic signal of interest which includes noise and also having a plurality of reference channels adapted to sense such noise correlated with the noise on the signal channel. In the adaptive canceler of the apparatus, a pipelined approach is used wherein the reference signals are divided into two or more sections having concurrent weight adjustment. This architecture allows the speed of adaptive cancellation to be increased and/or the number of reference taps to be increased without loss of cancellation speed. Once a continuous stream of digital data has been established in this architecture, the speed of the adaptive processor is limited only by approximately the processing time of the slowest element. In the preferred embodiment of the adaptive analysis apparatus, the noise canceled signal is converted to the frequency domain in a Fast Fourier Transform device. A central processing unit provides automatic analysis of the digital spectrum of the noise canceled signal based on a comparative analysis with predetermined reference data using statistical analysis criteria. In one embodiment, this reference data will be based on the prior analysis of a statistically sufficient sample of known devices under noise conditions similar to the noise conditions when the actual real-time analysis is to be performed.

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