Active adaptive noise canceller without training mode

Details Active adaptive noise canceller without training mode Active adaptive noise canceller without training mode

H - Electricity

03

F

H03F 1/26 (2006.01) G10K 11/178 (2006.01)

Patent

CA 2047524

An active adaptive noise canceller (20) that inserts delays (21) in the weight up- date logic (22) of an adaptive filter (13) employed by the canceller (20) to make the fil- ter (13) stable. It has been found that there is a great deal of flexibility regarding the selection of the delay values. This insensitivity permits designing the delays in ad- vance, and not having to adjust them to different situations as they change, thus no longer requiring a training mode. The canceller (20) dramatically reduces the amount of hardware needed to perform active adaptive noise cancelling, and eliminates the need for the training mode, which in some applications, including automobiles, for example, can be as objectionable as the noise sources that are to be suppressed.

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