Analog signal summing conference circuit

Details Analog signal summing conference circuit Analog signal summing conference circuit

1976-10-18

1977-09-20

Cooper, William C.

H04M 356

Patent

active

040499200

ABSTRACT:
This specification discloses a telephone conferencing arrangement employed with a plurality of conference interface ports in a time division multiplex (TDM), private branch exchange (PBX). Each port receives from the PBX the TDM conference signal of a respectively associated conferee and transmits an analog version of the conference signal to the conferencing system. Conferencing is achieved by combining the analog conference signals into a plurality of composite signals which are subsequently recombined via resistance-value related conductive paths with the uncombined analog conference signals in selectable transmission phases and amplitudes so as to provide at the receiving terminal of each conference interface port a composite signal comprised of the selectably phased conference signals transmitted by the other conference interface ports. Thus, when the PBX retransmits to the conferencing system a portion of each of the received composite signals, the retransmissions tend to cancel each other, thereby preventing regenerative instability in the conferencing system.

REFERENCES:
patent: 3991280 (1976-11-01), James et al.

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