AUDIO HEADSET WITH ACTIVE NOISE CONTROL, ANTI-OCCLUSION CONTROL AND PASSIVE ATTENUATION CANCELLING, AS A FUNCTION OF THE PRESENCE OR THE ABSENCE OF A VOICE ACTIVITY OF THE HEADSET USER
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United States of America Patent
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app pub date -
Oct 24, 2016
filing date -
Nov 19, 2015
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Abstract
The headset includes an active noise control with an internal microphone (28) and an external microphone (32). A processor (42) comprises a feedback branch (46), adjusted so as to attenuate the low frequencies corresponding to a component of a voice signal transmitted by bone conduction, and a feedforward branch (58) adjusted so as to compensate for the attenuation introduced by the feedback filtering and the passive acoustic attenuation introduced between the outside and the inside of the headset. A voice activity detector (60) operates a dynamic switching between two couples (HFB, HFF) of different transfer functions applied to the feedback (46) and feedforward (58) functions. This allows rendering in the most natural way possible to the user all the external sounds, including his own voice.
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