3-Port conference circuit for use in private automatic branch ex

Details 3-Port conference circuit for use in private automatic branch ex 3-Port conference circuit for use in private automatic branch ex

1977-12-05

1978-11-21

Cooper, William C.

H04M 356

Patent

active

041267664

ABSTRACT:
An improved conference technique whereby a number of channels in a telephone switching system employing pulse code modulation for transmission purposes are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a continuous threshold to pass the primary signal and to exclude the reflection. It is only used in the selection process, and for conditions which do not provide the threshold being met, the previous speaker is retained.

REFERENCES:
patent: 4007338 (1977-02-01), McLaughlin

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