Acoustic voice activity detection (avad) for electronic systems
AssigneeJawbone Innovations, LLC
InventorsNicolas Petit, Gregory Burnett, Zhinian Jing
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Abstract
Acoustic Voice Activity Detection (AVAD) methods and systems are described. The AVAD methods and systems, including corresponding algorithms or programs, use microphones to generate virtual directional microphones which have very similar noise responses and very dissimilar speech responses. The ratio of the energies of the virtual microphones is then calculated over a given window size and the ratio can then be used with a variety of methods to generate a VAD signal. The virtual microphones can be constructed using either an adaptive or a fixed filter.
Claims20
An acoustic voice activity detection system comprising:
- a first virtual microphone configured to produce a first virtual microphone output from a first combination of a first signal and a second signal, wherein the first signal is received from a first physical microphone and the second signal is received from a second physical microphone;
- a second virtual microphone configured to produce a second virtual microphone output from a second combination of the first signal and the second signal;
- and
- a filter configured to detect voiced speech, and background acoustic noise using the first virtual microphone output and the second virtual microphone output without use of a non-acoustic speech detector.
An acoustic voice activity detection method comprising:
- producing a first virtual microphone output of a first virtual microphone from a first combination of a first signal and a second signal, wherein the first signal is received from a first physical microphone and the second signal is received from a second physical microphone;
- producing a second virtual microphone output of a second virtual microphone from a second combination of the first signal and the second signal;
- and
- filtering the first virtual microphone output and the second virtual microphone output to detect voiced speech, unvoiced speech, and background acoustic noise using without use of a non-acoustic speech detector.
Dependencies are inferred from the claim text.