| 摘要 |
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.
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