Digital noise-cancellation
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United States of America Patent
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May 12, 2015
Grant Date -
Jan 24, 2013
app pub date -
Jul 16, 2012
filing date -
Jul 18, 2011
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Abstract
This invention relates to a device for and method of implementing an ambient noise-cancellation (ANC) circuit that uses digital processing whereby a signal indicative of the ambient noise is converted to digital form, filtered, using a fixed or adaptive digital filter, and then converted back to analog before sending it to an ear-proximate speaker. In order to address the time delays associated with such processing operations, the analog-to-digital converter used is associated with a down-sampler, and the arrangement is such that a first part of the filtering is implemented by the down-sampler, and a second part of the filtering is implemented by the digital filter. This reduces group delay by configuring a down-sampler associated with the front end of the analog-to-digital converter to incorporate selected filter characteristics of the overall ANC filter response, and modifying the subsequent filtering processing stage to compensate for this.
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