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| Number | Title | Issue Date |
| 4545050 | Method of and arrangement for establishing a conference connection in a TDM communication system To establish a conference connection between three participants in a TDM telephony system, use is made of the time-division switching stage which in many cases is already of a duplicated construction. The information signals (a, b, c) from the participant... | 10/01/1985 |
| 4521879 | Digital private branch exchange A digital private automatic branch exchange provides a plurality of ports which may comprise line trunks or operator circuits, the ports being grouped with each group being controlled by an individual microprocessor circuit which performs all real time co... | 06/04/1985 |
| 4499578 | Method and apparatus for controlling signal level in a digital conference arrangement For use in multiport digital conference arrangements wherein speech samples of selected speakers are summed for distribution to the conferees, the disclosed method and apparatus controls the level of speech represented by information samples to be include... | 02/12/1985 |
| 4499577 | Linear time division multiplexed conferencer for data transfer applications There is disclosed a general purpose linear time division multiplexed conference system for continuously summing and supplying digital message samples arriving in time slots within a frame. The conference system integrates both voice and data network conf... | 02/12/1985 |
| 4488291 | Circuit arrangement for setting up a conference call A conference circuit in a digital telephone switching system includes a first code converter (CCL), which converts nonlinearly coded speech samples into linearly coded speech samples, and adder (ADD), which sums the converted speech samples originating fr... | 12/11/1984 |
| 4481624 | Linear time division multiplexed conferencer 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 ... | 11/06/1984 |
| 4449217 | PCM Communication system and method of operation Process for control of the transmission of PCM signals between connectors of a PCM time-division multiplex communication network in a conference service and circuit for carrying out the process.... | 05/15/1984 |
| 4432087 | Demultiplexer circuit A demultiplexer circuit which extracts from an incoming time division multiplexed digital bit stream any combination of PCM encoded words or data bits, irrespective of the rate of latter or the position of the data bits in a given channel or channels. The... | 02/14/1984 |
| 4416007 | Digital conferencing method and arrangement A method and arrangement is disclosed for providing a digital conference capability for subscribers of a time division multiplex (TDM) communication system. Each conferee's pulse code modulation (PCM) signal is assigned one of N conference time slots of t... | 11/15/1983 |
| 4387457 | Digital conference circuit and method A digital conference circuit for a digital telephone switching network is provided, connected between a receive TDM (time division multiplex) bus carrying PCM (pulse code modulation) words to the conference circuit and a transmit TDM bus carrying PCM word... | 06/07/1983 |
| 4359603 | CVSD Multiple conference system A plurality of conferencers are connected to a common bus. Each conferencer has a plurality of accumulators each for outputting a CVSD conference. Each conferencer selectively places any one or all or any combination of a plurality of inputs in any one or... | 11/16/1982 |
| 4301531 | Three-party conference circuit for digital time-division-multiplex communication systems A three-party conference circuit provides for three-party conference calls in time-division-multiplex communication systems utilizing pulse-code modulation. The digitized speech signals from a selected group of channels are received from an incoming PCM h... | 11/17/1981 |
| 4280216 | Method of making conference call connections in a multiplex switching system A method for making connections for conference calls in a PCM time division multiplex switching system incorporates the steps of adding, during each pulse frame, code words received from subscribers to each conference call, and storing code words represen... | 07/21/1981 |
| 4274155 | Multiport conference circuit with multi-frame summing and voice level coding An improved conference circuit for use in a Pulse Code Modulation telephone switching system wherein a number of channels are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided w... | 06/16/1981 |
| 4257120 | Multiport conference circuit with multi-frame summing An improved conference circuit for use in a Pulse Code Modulation telephone switching system wherein a number of channels are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided w... | 03/17/1981 |
| 4215247 | Digital conferencing apparatus Apparatus is illustrated for converting nonlinear or compressed digital information representative of an analog signal from a plurality of sources into a single composite digital signal. As specifically used and illustrated, a plurality of digital voice s... | 07/29/1980 |
| 4190744 | Circuit arrangement and process for producing conference connections between three conference parties in a PCM time multiplex switching system In producing conference connections between, in each case, three conference parties in a PCM time multiplex switching system, sum code words formed of PCM words supplied by the respective remaining conference parties, possibly after conversion thereof int... | 02/26/1980 |
| 3984643 | Method and apparatus for establishing a plurality of simultaneous conferences in a PCM switching system A pair of interchangeable memories is provided, one of which receives a PCM frame while simultaneously transmitting one, while the other of which, containing the previous frame, outputs the channel bits for parallel processing. Each simultaneous conferenc... | 10/05/1976 |
