Method for forming a conference connection in a time division mu

Details Method for forming a conference connection in a time division mu Method for forming a conference connection in a time division mu

1975-09-18

1977-09-20

Brown, Thomas W.

179 15AL, H04M 356

Patent

active

040499219

ABSTRACT:
A method for connecting subscribers to form a conference call in a time division multiplex (TDM) telecommunication switching system having a TDM ring-like circuit running from subscriber to subscriber is described. A subscriber speech word is added to a pulse code modulated (PCM) word transferred to the subscriber station, and the summation PCM word is both retransferred and stored in the subscriber station for a time-slot frame. The stored preceding PCM word is subtracted from the PCM word transferred to the subscriber station, and the differential PCM word forms an aural signal.

REFERENCES:
patent: 3551600 (1970-12-01), Berch
patent: 3586782 (1971-06-01), Thomas
patent: 3828146 (1974-08-01), Lewis
patent: 3835259 (1974-09-01), Medill et al.
patent: 3924082 (1975-12-01), Oliver et al.

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