Pulse or digital communications – Miscellaneous
Patent
1994-12-16
1996-03-19
Cole, Sr., Edward L.
Pulse or digital communications
Miscellaneous
375350, 379 3, 379410, 370 321, H04L 2300, H04M 124, H04J 100
Patent
active
055008801
ABSTRACT:
Transmission system comprising a sub-band echo canceller which includes a sub-band coding arrangement.
The invention relates to a transmission system comprising a sub-band echo canceller which includes a canceller that can be switched between a receive path (r) and a send path (s).
To reduce the computational complexity as well as the signal delays also with sub-band coding or sub-band decoding, the sub-band coding arrangement comprises a synthesis filter bank and an analysis filter bank which are provided for sub-band coding and also for sub-band echo cancellation.
Advantageous applications for the echo canceller are subscriber terminal units, for example, hands-free facilities for car telephones, videophones or video conference units which have an echo path formed by at least one microphone and at least one loudspeaker.
REFERENCES:
patent: 4827472 (1989-05-01), Ferrieu
patent: 4979188 (1990-12-01), Kotzin
patent: 5272695 (1993-12-01), Makino et al.
patent: 5297163 (1994-03-01), Pfeiffer
patent: 5315585 (1994-05-01), Iizuka et al.
patent: 5448555 (1995-09-01), Berner
"Advances in Speech Signal Processing", by S. Fair and M. Sondhi, pp. 327-356.
Cole, Sr. Edward L.
Eason Leroy
Nguyen Madeleine Anh-Vinh
U.S. Philips Corporation
Weiss Richard
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