Multiple adaptive filter active noise canceller

Details Multiple adaptive filter active noise canceller Multiple adaptive filter active noise canceller

1993-04-27

1995-06-13

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

054251052

ABSTRACT:
An active adaptive noise canceller that does not require a training mode and operates over an extended noise bandwidth. The canceller partitions the noise bandwidth into frequency sub-bands, and multiple adaptive filter channels are employed, one for each sub-band, to cancel noise energy in the respective sub-bands. Each channel includes bandpass filters to restrict the channel to operation over only the particular sub-band, and delays are inserted in the operation of the filter weight updating. Because each channel is stable over its sub-band, the canceller operates over the extended noise bandwidth of all the sub-bands.

REFERENCES:
patent: 4689821 (1987-08-01), Salikuddin et al.
"Hear No Evil" Popular Science Apr. 1992, p. 84.

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