Digital CVSD telephone conference circuit

Details Digital CVSD telephone conference circuit Digital CVSD telephone conference circuit

1977-12-22

1979-08-07

Claffy, Kathleen H.

H04M 356

Patent

active

041638719

ABSTRACT:
A six-telephone channel conference system features an all-digital CVSD (continuously variable slope delta modulation) conference bridge-like circuit. The delta modulation pulse train in each channel is transformed into a series of slope numbers which are processed by the conference circuit addition function to provide zero insertion loss, then by the subtraction function to provide 100% cancellation of a talker's voice to his ear. Transformation involves a sequential three-bit algorithm.

REFERENCES:
patent: 3885100 (1975-05-01), Stidham
patent: 3970797 (1976-07-01), Johnson et al.
patent: 3979676 (1976-09-01), Poma

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