At&t Bell Laboratories

At&t Information Systems Inc.

Michael S Lane

John R Colton

Nicholas K Smith

Lawrence Baranyai

Thomas P Sosnowski

Terrence Thomas Quin

Lawrence D Fossett

Peter E Costello

Steven D Scholbrock

The disclosed arrangement of digital signal processor and echo cancellor is connectable to four wire transmission facilities on a per port basis for providing adaptive signal conditioning to reduce noise and improve level contrast among conferees of a digital conference connection. The digital signal processor applies an adaptive gain value to incoming speech signals for either increasing or decreasing the level of these signals to meet a predetermined threshold. A fixed gain adjustment is applied to incoming noise signals to reduce the level of these signals. The arrangement also provides a last-talker holdover mode in which the last gain adjustment applied to last-talker speech is applied to idle channel noise on that line.

Conferencing system adaptive signal conditioner

There is disclosed an ACD management information system which tracks attendant work performance without regard to the actual station at which the attendant is operating. The system also monitors non-ACD work states and provides individualized status reports based upon temporarily stored limit criteria. A real time display of system performance is provided to a supervisor in a manner which allows for immediate rearrangement of the system without resort to other data. The displayed data includes split handling information, and call abandon information, trunk busy information and work state information.

ACD Management information system

There is disclosed a linear time division multiplexed time slot conference for continuously summing and outputting digital message samples received from n connected telephone lines respective to m sequential time slots. The conferencer processes 256 time slots and uses prefetching techniques to reduce memory requirements to allow the circuit to be integrated into a single chip. Besides establishing conference-type connections, the conferencer has the capability to establish broadcast and monitor connections. Message samples collected from each connected line of a conference connection are summed during a first time frame and outputted during a second time frame. The conferencer includes circuitry for detecting either positive or negative overflow which could result from the summation process, and in this respect, selects an alternate message for outputting.

Linear time division multiplexed conferencer

There is disclosed a linear time division multiplexed time slot conferencer in which a summation of incoming message samples respective to a group of time slots are stored in a summation memory during a first frame and extended to an output during a next or second frame. The conferencer processes 256 time slots and refreshes the summation memory each frame by recognizing a first access to the memory with respect to a group of time slots and directly loads a new incoming message sample over the priorly stored summation for that group.

Growing community of inventors

Colts Neck, NJ, United States of America

Michael S Lane