TELEPHONE SET WHICH CAN BE ADJUSTED IN RESPONSE TO AMBIENT NOISE

A telephone set includes transmitting parts (M, 131, 132) which enable a speaker to send a voice message to a correspondent, receiving parts (E, 132, 133) which enable the speaker to receive a return voice message coming from the correspondent and circuitry (11, 12, 16) which permit the sound volume of the return voice message supplied to the speaker via the receiving means to be adapted as a function of a sound volume of ambient noise locally surrounding the speaker. The adaptation circuitry includes a fuzzy logic section (14, 15) which receives measurements of a breathing noise caused by the speaker and measurements of the speech signal and of the ambient noise, and produces a control signal (COM) for monitoring the sound volume of the return voice message sent to the speaker.