H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/44
H04M 3/56 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1210541
- 29 - CONFERENCING SYSTEM ADAPTIVE SIGNAL CONDITIONER Abstract The disclosed arrangement of digital signal processor and echo cancellor is connectable to four wire transmission facilities on a per port basis for providing adaptive signal conditioning to reduce noise and improve level contrast among conferees of a digital conference connection. The digital signal processor applies an adaptive gain value to incoming speech signals for either increasing or decreasing the level of these signals to meet a predetermined threshold. A fixed gain adjustment is applied to incoming noise signals to reduce the level of these signals. The arrangement also provides a last-talker holdover mode in which the last gain adjustment applied to last-talker speech is applied to idle channel noise on that line.
454586
Lane Michael S.
Scholbrock Steven D.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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