US 2019/0132679 A1 · LOW DELAY DECIMATOR AND INTERPOLATOR FILTERS

Abstract

Systems and methods for low latency adaptive noise cancellation include an audio sensor to sense environmental noise and generate a noise signal, an audio processing path to receive an audio signal, process the audio signal through an interpolation filter, and generate a primary audio signal having a first sample frequency, an adaptive noise cancellation processor to receive the noise signal and generate an anti-noise signal, a direct interpolator to receive the anti-noise signal and generate an anti-noise signal having the first sample frequency, and a limiter to provide clipping to reduce a number of bits in the anti-noise signal, an adder operable to combine the primary audio signal and the anti-noise signal and generate a combined output signal, and a low latency filter to process the combined output signal.

Claims20

Dependent claims

A system comprising:

an audio sensor operable to sense environmental noise and generate a noise signal;
an audio processing path operable to receive an audio signal, process the audio signal through an interpolation filter, and generate a primary audio signal having a first sample frequency;
an adaptive noise cancellation processor operable to receive the noise signal and generate a corresponding an anti-noise signal;
a direct interpolator operable to receive the anti-noise signal and generate an upsampled anti-noise signal having the first sample frequency;
an adder operable to receive and combine the primary audio signal and the upsampled anti-noise signal and generate a combined output signal;
and
a low latency filter operable to process the combined output signal.

4 more elements

Dependencies are inferred from the claim text.

Low delay decimator and interpolator filters

Life of this patent

Low delay decimator and interpolator filters

Life of this patent

Abstract

Claims20