Linear time division multiplexed conferencer

Details Linear time division multiplexed conferencer Linear time division multiplexed conferencer

1982-06-24

1984-11-06

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

179 18BC, H04M 356

Patent

active

044816243

ABSTRACT:
There is disclosed a linear time division multiplexed time slot conference for continuously summing and outputting digital message samples received from n connected telephone lines respective to m sequential time slots. The conferencer processes 256 time slots and uses prefetching techniques to reduce memory requirements to allow the circuit to be integrated into a single chip. Besides establishing conference-type connections, the conferencer has the capability to establish broadcast and monitor connections. Message samples collected from each connected line of a conference connection are summed during a first time frame and outputted during a second time frame. The conferencer includes circuitry for detecting either positive or negative overflow which could result from the summation process, and in this respect, selects an alternate message for outputting.

REFERENCES:
patent: 4119807 (1978-10-01), Nahay
patent: 4190742 (1980-02-01), Southard
patent: 4190744 (1980-02-01), Frank
patent: 4295008 (1981-10-01), Johnson et al.
patent: 4298977 (1981-11-01), Abbott et al.
patent: 4307462 (1981-12-01), Mazzocchi

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