1974-12-13
1976-08-17
Claffy, Kathleen H.
179 1HF, 1791702, H04M 120
Patent
active
039755886
ABSTRACT:
An acoustic feedback control to be installed in every extension provided with a loud speaker and a microphone in a digital telephone system. Each extension is provided with a coder and a decoder of the syllabic compression type which therefore have quantizing steps varying with the voice level at the input of the transmission channels between two extensions. A comparator receives the step information from the coder and decoder and prevents the decoder step from increasing when the coder step exceeds the decoder step.
REFERENCES:
patent: 3562448 (1968-06-01), May, Jr.
patent: 3673355 (1972-06-01), La Marche et al.
patent: 3735055 (1973-05-01), Thomas
patent: 3821494 (1974-06-01), Besseyre
patent: 3832491 (1974-08-01), Sciulli
IEEE Transactions On Communication, Dec. 1972, A Digital Echo Suppressor For Satellite Circuit, pp. 1176-1181
Besseyre Jacques A.
Jacquart Christian A.
Marijon Jean-Louis H.
Claffy Kathleen H.
International Business Machines - Corporation
Poag Frederick D.
Popek Joseph A.
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