Conference call circuitry for TDM signal exchange

Details Conference call circuitry for TDM signal exchange Conference call circuitry for TDM signal exchange

1974-06-03

1976-09-28

Claffy, Kathleen H.

179 15AT, 179 18BC, H04M 356

Patent

active

039833321

ABSTRACT:
Conference call provisions are incorporated in a Time Division Multiplex (TDM) signalling exchange wherein the signals are summed energywise and transmitted to a receiving subscriber set without subtracting the signal from that subscriber set and any tendency toward regeneration is obviated by filtered signal reconstruction in conjunction with sample-and-hold signal reconstruction of the TDM signalling system. Simple low-pass, high-pass and band-shaping filters are adequate for the purpose.

REFERENCES:
patent: 3551600 (1970-12-01), Berch
patent: 3692947 (1972-09-01), Lewis
patent: 3699264 (1972-10-01), Pitroda et al.
patent: 3835259 (1974-09-01), Medill et al.
patent: 3870819 (1975-03-01), Dennis et al.

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