COMBINED MICROPHONE AND EARPHONE AUDIO HEADSET HAVING MEANS FOR DENOISING NEAR SPEECH SIGNAL, IN PARTICULAR FOR HANDS-FREE TELEPHONY SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an audio headset capable of denoising speech signals uttered by a wearer and transmitting the speech signals to a remote listener.

SOLUTION: The headset comprises: a physiological sensor 18 which is brought into contact with the cheek or the temple of the wearer, for picking up non-acoustic voice vibration transmitted by internal bone conduction and outputting first voice signals; a set of microphones 20 and 22 for picking up the acoustic voice vibrations transmitted from a mouth of the wearer by the air and outputting second voice signals; and mixer means 54 for combining the first voice signals and the second voice signals and outputting third signals representative of the speech uttered by the wearer of the headset. The first voice signals are used by means 44 for calculating a cutoff frequency of a low-pass filter 48 and high-pass filters 50 and 52 and by means 64 and 66 for calculating the probability that speech is absent.

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