Multiplex communications – Wide area network – Packet switching
Patent
1993-03-24
1995-02-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
379202, H04Q 1104
Patent
active
053901770
ABSTRACT:
A conferencing bridging technique for compressed information signals which monitors the signal energy transmitted by each conferee. When there is only one conferee speaking, the summing circuit in the bridge unit is bypassed along with the speech decoding/coding apparatus and the talking conferee's signal is broadcast to all conferees. If there is more than one conferee speaking at any given time, then only the speaking conferee's signals are routed to an associated speech decoder wherein those conferees' compressed signals are decompressed. These decompressed signals are then combined by the summing circuit and the sum is recompressed and broadcast to all conferees. Advantageously, the above-described technique eliminates the signal degradation associated with tandeming of signal decoding and coding operations and permits the sharing of a smaller number of signal decoders among a larger number of conferees.
REFERENCES:
patent: 4499578 (1985-02-01), Marouf et al.
patent: 5127001 (1992-06-01), Steagall et al.
patent: 5150410 (1992-09-01), Bertrand
patent: 5157491 (1992-10-01), Kassatly
U.S. patent application Ser. No. 07/999063 (A. Feiner et al. Case 41-1-8-28-22), filed on Dec. 31, 1992.
AT&T Corp.
Olms Douglas W.
Padnes David R.
Ton Dang
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