Microphone/headphone audio headset comprising a means for suppressing noise in a speech signal, in particular for a hands-free telephone system

摘要

#CMT# #/CMT# The headset has a physiological sensor (18) provided in an insulating cushion of a closed shell of one of earpieces. A microphone set has front and rear microphones (20, 22) placed on the shell and aligned to form a linear array in a main direction toward a mouth of a wearer. A combiner-and-phase shifter (56) reduces non-frequency noise of speech signal and includes a combiner for applying a delay to a signal delivered by the microphone and subtracting a signal delivered by another microphone from the delay signal so as to remove noise from a near speech signal uttered by the wearer. #CMT#USE : #/CMT# Combined microphone and earphone type audio headset for communications functions e.g. hands-free telephony functions. #CMT#ADVANTAGE : #/CMT# The physiological sensor enables picking up such voice vibration that is free of noise, applied directly against a cheek or temple so as to access new information relating to speech content. The combiner applies the delay to the signal delivered by the microphone and subtracts the signal delivered by another microphone from the delay signal so as to effectively remove the noise from the near speech signal uttered by the wearer. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a block diagram illustrating processing of signal to deliver a denoised signal representative of speech uttered by a wearer of headset. 18 : Physiological sensor 20 : Front microphone 22 : Rear microphone 48 : Low-pass filter 56 : Combiner-and-phase shifter.