Method of improving sidetone attenuation in electroacoustic syst

Details Method of improving sidetone attenuation in electroacoustic syst Method of improving sidetone attenuation in electroacoustic syst

1994-02-16

1995-11-14

Hofsass, Jeffery A.

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

379388, 379389, 379390, 379391, 379402, 379410, H04M 908

Patent

active

054673941

ABSTRACT:
To improve the anti-sidetone of electro-acoustic installations, particularly to improve the intercom characteristics of a telecommunication terminal, with compander control by an echo evaluation circuit (52) assigned to the compander (4), the latter has an echo compensator (40) located upstream, and/or a voice-controlled balance (51) is located downstream of the compander (4), which are controlled by the echo evaluation circuit (52) of the compander (4). To control the echo compensator (40) and/or the voice-controlled balance (51), the usual control circuitry required for their operation can be omitted. The result is a particularly effective, economical method with very good intercom characteristics.

REFERENCES:
patent: 4891837 (1990-01-01), Walker et al.
patent: 5170430 (1992-12-01), Schuh
patent: 5235637 (1993-08-01), Kraz et al.
patent: 5359653 (1994-10-01), Walker et al.
Proceeding of Eusipco-88 Fourth European Signal Processing Conference 5. Sep. 1988, Grenoble, France, Seiten 495-498.
XP92389 W. Armbruster `High Quality Hands-Free Telephony using Voice Switching Optimized with Echo Cancellation`.

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