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AssigneeGoogle Inc.
InventorsAbhijit Shah, Guohua Sun, Lawrence Frederick Heyl, Niel David Warren
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The subject matter described herein provides systems and techniques for filtering an audio signal using active noise cancellation (ANC). A channel response finite impulse response (CR FIR) filter in a conventional ANC system may be replaced with a two filter cascade configuration. The first filter in the cascade filter configuration may be a CR FIR filter with interleaved zero coefficients and the second filter may be a response interpolator filter that is a fixed interpolator. The CR FIR filter in the two filter cascade may be adaptive and may have its non-zero coefficients tracked, updated, adapted, and/or computed. The fixed interpolator in the two filter cascade may be fixed and therefore non-adaptive. The channel frequency response profile of the two filter cascade configuration may be similar to the channel frequency response profile of the conventional CR FIR filter that the cascade filter configuration replaces.
An active noise cancellation system, the system comprising:
A non-transitory computer-readable medium storing instructions, that when executed by one or more processors, cause the one or more processors to:
A method of active noise cancellation, the method comprising:
Dependencies are inferred from the claim text.