1. An audio headset of the combined microphone and earphone type, the headset comprising: two earpieces each including a transducer for sound reproduction of an audio signal; a physiological sensor suitable for coming into contact with the cheek or the temple of the wearer of the headset so as to be coupled thereto and pick up non-acoustic voice vibration transmitted by internal bone conduction, the physiological sensor delivering a first speech signal; a microphone set comprising at least one microphone suitable for picking up acoustic voice vibration transmitted by air from the mouth of the wearer of the headset, said microphone set delivering a second speech signal; and mixer means for combining the first and second speech signals and for outputting a third speech signal representative of the speech uttered by the wearer of the headset; wherein: the physiological sensor is incorporated in an ear-surrounding cushion of a shell of one of the earpieces; the set of microphones comprises two microphones placed on the shell of one of the earpieces; the two microphones are in alignment to form a linear array in a main direction pointing towards the mouth of the wearer of the headset; and means are provided for reducing the non-frequency noise of the second speech signal, said means comprising a combiner suitable for applying a delay to the signal delivered by one of the microphones and for subtracting from said delay signal the signal delivered by the other microphone in such a manner as to remove noise from the near speech signal uttered by the wearer of the headset.