Digital conferencing method and arrangement

Details Digital conferencing method and arrangement Digital conferencing method and arrangement

1981-11-20

1983-11-15

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

179 18BC, H04M 356

Patent

active

044160070

ABSTRACT:
A method and arrangement is disclosed for providing a digital conference capability for subscribers of a time division multiplex (TDM) communication system. Each conferee's pulse code modulation (PCM) signal is assigned one of N conference time slots of the TDM system. The arrangement serially stores in memory the PCM signals of N-1 time slots. Circuitry serially generates the sum of the previously stored N-1 time slot PCM signals concurrently with the serial writing into memory of the PCM signal of each time slot. During each time slot a composite PCM conference signal is formed by combining the PCM signal of that time slot with the summed PCM signal and distributed to the conferees assigned to that time slot.

REFERENCES:
patent: 4048449 (1977-09-01), Natebusch
patent: 4049921 (1977-09-01), Zwack
patent: 4119807 (1978-10-01), Nahay
patent: 4230908 (1980-10-01), Davis et al.
patent: 4280216 (1981-07-01), Zeitrag
patent: 4288871 (1981-09-01), Baugh
Bell System Technical Journal; vol. 54, No. 5, May, Jun. 1975, "Local Distribution System", by E. C. Bender et al., p. 920.

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