Telephone set which can be adjusted in response to ambient noise

Details Telephone set which can be adjusted in response to ambient noise Telephone set which can be adjusted in response to ambient noise

1996-11-15

1999-06-15

Tsang, Fan S.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379410, 381107, H04M 160

Patent

active

059129654

ABSTRACT:
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.

REFERENCES:
patent: 4507524 (1985-03-01), Yun
patent: 4829565 (1989-05-01), Goldberg
patent: 5732390 (1998-03-01), Katayanagi et al.
Apr. 27-30 1993 International Conference on Acoustics, Speech and Signal Processing, "Frequency domain noise suppression approaches in mobile telephone systems", Jun Yang, Minneapolis.

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