Framed digital voice summing for teleconferencing

Details Framed digital voice summing for teleconferencing Framed digital voice summing for teleconferencing

1984-10-29

1987-04-14

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

379202, H04J 302, H04M 356

Patent

active

046583980

ABSTRACT:
In a teleconferencing system activity levels of digital voice signals are compared over activity selection times and the signals are multiplied, over frame delays, by predetermined constants dependent on the relative levels of activity. The most active signal is multiplied by a constant of at least about 0.8, so that signal dominates through a frame delay, but the frame delays are sufficiently short that multiple speakers can be understood from the summed signal. No speaker maintains dominance for a sufficiently long time to substantially suppress speech of others.

REFERENCES:
patent: 4254497 (1981-03-01), Funderburk et al.
patent: 4359603 (1982-11-01), Heaton
patent: 4387457 (1983-06-01), Munter
patent: 4488291 (1984-12-01), Eschmann et al.
patent: 4499578 (1985-02-01), Marouf et al.
Satyan G. Pitroda and Bernard J. Rekiere, "A Digital Conference Circuit for an Instant Speaker Algorithm", Transaction of Communication Technology, vol. Com-19, No. 6, pp. 1069-1076, Dec. 1971.

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