US 2018/0293999 A1 · VOICE ENERGY DETECTION

Abstract

A system uses a voice energy detection (VED) circuit along with a capture buffer for improved performance and lower power dissipation. With a VED assigned to each microphone in the system, combing the output of more than one VED to improve the detection probability or reduce the false alarm rate improves the post detection signal-to-noise ratio. One or more VED circuits are dynamically selected based on background energy and detection performance. Further, a digital VED algorithm dynamically changes the oversampling ratio (OSR) values and passband bandwidth as a function of the loudness of the background noise and desired signal levels. If the desired signal or noise is strong, then the OSR is reduced to save power. If desired speech is detected, then the OSR value increases to get the target SNR for the remaining audio processing needs.

Claims20

Dependent claims

A voice energy detection (VED) system, comprising:

one or more microphones configured to receive a sound input;
a VED circuit for each of the one or more microphones, the VED circuit being configured to
detect voice energy in the sound input received by the one or more microphones,
detect a predetermined keyword when the detected voice energy is greater than a predetermined threshold, and
process the received sound input using one or more of contextual and natural language processing in response to the predetermined keyword being detected.

2 more elements

Dependencies are inferred from the claim text.

Voice energy detection

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Voice energy detection

Life of this patent

Abstract

Claims20