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Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Popek, Joseph A.
Attorney: Poag; Frederick D.

Next ten patents ordered by date:

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Title: Acoustic feedback control

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.

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Inventors: Besseyre, Jacques A. (Nice, FR)
Jacquart, Christian A. (Gattieres, FR)
Marijon, Jean-Louis H. (Saint Laurent du Var, FR)

Application Number: 532548
Filing Date: 1974-12-13
Publication_date: 1976-08-17
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Class(es): 379/388.07 375/249
Other Classes:
US Patent Ref:

3562448	Jun, 1968	Ma, Jr.	179/170.
3673355	Jun, 1972	La Marche et al.	179/170.
3735055	May, 1973	Thomas	179/170.
3821494	Jun, 1974	Besseyre	179/170.
3832491	Aug, 1974	Sciulli	179/1.

Other Refs: Other References: IEEE Transactions On Communication, Dec. 1972, A Digital Echo Suppressor For Satellite Circuit, pp. 1176-1181