Method and apparatus for establishing conference calls in a time

Details Method and apparatus for establishing conference calls in a time Method and apparatus for establishing conference calls in a time

1977-08-23

1978-08-22

Brown, Thomas W.

H04M 356

Patent

active

041091116

ABSTRACT:
A pulse code modulation, time division multiplex conferencing system for providing to each party channel a signal indicative of the linear sum of the samples from all other party-channels, such signals are generated by accumulating the sum of all samples from all party-channels, then generating an output signal to a particular party channel by subtracting from the sum the contribution of the particular party-channel. The cumulative sum is updated upon receipt of each new sample. Provisions for conferencing channels in a plurality of sequentially aligned frames are also disclosed.

REFERENCES:
patent: 3984643 (1976-10-01), Inrig et al.
patent: 4022991 (1977-05-01), Kelly et al.
patent: 4049921 (1977-09-01), Zwack
patent: 4059735 (1977-11-01), Betts

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