Circuit for nulling the talker's speech in a conference call and

Details Circuit for nulling the talker's speech in a conference call and Circuit for nulling the talker's speech in a conference call and

1990-03-06

1991-10-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 77, 379202, H04M 342, H04Q 1104

Patent

active

050540211

ABSTRACT:
A method and circuit for nulling each talker's speech in a conference call having a plurality of parties who are selectively talkers and listeners. The parties are interconnected on PCM telephone carrier lines (T1 or CEPT) which are connected to a digitized conference bridge. The circuit of the present invention has a summation circuit for adding together all of the speech data on the carrier lines occurring in the conference call during a particular time slot. A circuit is used for delaying the speech of each individual talker. Finally, the circuit of the present invention utilizes a subtraction circuit for subtracting the delayed speech of each individual talker from the summation of all speech for delivery back to the ears of the individual talker. The delaying circuit precisely delays the speech of each individual talker so as to corespond in timing with the output of the summation circuit. The present invention fully deletes the individual talker speech so as to totally eliminate echo and the timing is such so as to eliminate distortion.

REFERENCES:
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

Affiliated with

Also associated with

Rating

Circuit for nulling the talker's speech in a conference call and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for nulling the talker's speech in a conference call and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for nulling the talker's speech in a conference call and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1760699