Circuit arrangement for setting up conference calls in a digital

Details Circuit arrangement for setting up conference calls in a digital Circuit arrangement for setting up conference calls in a digital

1994-02-18

1996-04-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701104, 379202, H04L 1218

Patent

active

055110711

ABSTRACT:
A circuit arrangement sets up conference calls in a digital time-division multiplex telecommunications switching center. For setting up three-party connections, a conference unit (KE) having a PROM is provided wherein are stored all possible, companded sum and difference values of individual contributions of respectively two conference participants. These are selected by the individual contributions as read selection addresses. The PROM thus realizes the functions of linearization of the sum and difference and of companding that are performed by separate sub-units in previous conference units.

REFERENCES:
patent: 4190744 (1980-02-01), Frank
patent: 4301531 (1981-11-01), Lubin
patent: 4393496 (1983-07-01), Zeitraeg
patent: 4757494 (1988-07-01), Renner

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