Whisper circuit for a conference call bridge including talker nu

Details Whisper circuit for a conference call bridge including talker nu Whisper circuit for a conference call bridge including talker nu

1990-03-06

1991-07-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 68, 370 77, 379202, H04M 342, H04Q 1104

Patent

active

050349473

ABSTRACT:
A circuit enabling whisper conferencing between two whisper conferees in a conference call. The conference call may contain any number of parties including the two whisper conferees and is interconnected to a digitized conference bridge over PCM telephone carrier lines. The present invention includes a cross-point switch connected to the PCM telephone carrier lines for interchanging the PCM speech data occurring in the time slots for the two whisper conferees so that the PCM speech data for the first of the two whisper conferees is placed in the time slot for the second of the two whisper conferees and vice versa. A summation circuit is utilized to sum the telephone conversations of all remaining conferees and the two interchanged telephone conversations of the whisper conferees are then selectively added to the summed signals. Talker nulling is also incorporated into a combined talker nulling/whisper conferencing circuit so as to provide nulling to all talkers (other than whisper conferees) to the telephone conversation.

REFERENCES:
patent: 3743790 (1973-07-01), Hilsley
patent: 3835259 (1974-09-01), Medill et al.
patent: 4109111 (1978-08-01), Cook
patent: 4416007 (1983-11-01), Huizinga et al.
patent: 4485469 (1984-11-01), Witmore
patent: 4797876 (1989-01-01), Ratcliff

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