Cirrus Logic Inc.

Hu Chen

Brenton Robert Steele

Ben Hutchins

A signal processing device for configurable voice activity detection. A plurality of inputs receive respective microphone signals. A microphone signal router configurably routes the microphone signals. At least one voice activity detection module receives a pair of microphone signals from the router, and produces a respective output indicating whether speech or noise has been detected by the voice activity detection module in the respective pair of microphone signals. A voice activity decision module receives the output of the voice activity detection module(s) and determines whether voice activity exists in the microphone signals. A spatial noise reduction module receives microphone signals from the microphone signal router, and performs adaptive beamforming based in part upon the output of the voice activity decision module, and outputs a spatial noise reduced output. The device permits simple configurability to deliver spatial noise reduction for one of a wide variety of headset form factors.

Flexible voice capture front-end for headsets

A device for wind noise reduction and spatial noise reduction comprises a first microphone for capturing a nominal speech signal, and a second microphone for capturing a nominal noise signal. The device has a generalized sidelobe canceller for spatial noise reduction, comprising a blocking matrix filter configured to adaptively process the nominal speech signal to produce a speech cancellation signal, a first subtraction node for subtracting the speech cancellation signal from the nominal noise signal to produce a noise reference signal, a noise cancellation filter configured to adaptively filter the noise reference signal to produce a noise cancellation signal, and a second subtraction node for subtracting the noise cancellation signal from the nominal speech signal to produce a speech reference signal. The device has a wind noise reduction module for wind noise reduction, the wind noise reduction module comprising at least one filter derived from the blocking matrix filter of the generalized sidelobe canceller.

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Cremorne, Australia

Hu Chen