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| Number | Title | Issue Date |
| 4847829 | Video conferencing network A video conferencing network includes remote video terminals (10) interconnected to a switching network (66) through coaxial cables (16). The switching network (66) is operable to provide an audio and video data path between two or more video terminals (1... | 07/11/1989 |
| 4845499 | Method for generating PCM logarithmic values from linear values A method for generating PCM logarithmic values from linear values and storing these values in memory for efficient and rapid data retrieval is shown. This is an off-line method of generating the contents of a programmable read only memory for rapid on-lin... | 07/04/1989 |
| 4845497 | Conference circuit for a digital communication system A 001 conference circuit for a digital communication system in which the analog-to-digital and digital-to-analog converters of at least two subscriber terminal stations have different bandwidth of their processable analog signals or in the code format of ... | 07/04/1989 |
| 4796293 | Enhanced dedicated teleconferencing system A method and apparatus for enhancing the operation of a teleconferencing system, utilizes a programmed service computer to drive a bridge which has a plurality of ports for establishing communication with a plurality of conferees. The bridge includes a mi... | 01/03/1989 |
| 4741025 | Speech additive distribution equipment for conferencing system An audio bridge for a telephone conference is disclosed. The audio bridge; comprises a channel signal processing unit assigned to at least three channels. Each channel signal processing circuit comprises an echo canceller to cancel an echo signal from the... | 04/26/1988 |
| 4710917 | Video conferencing network A video conferencing network includes remote video terminals (10) interconnected to a switching network (66) through coaxial cables (16). The switching network (66) is operable to provide an audio and video data path between two or more video terminals (1... | 12/01/1987 |
| 4667319 | Digital repeater with 3-way branching of service channels A novel 3-way digital branching network located at a telecommunications repeater branches digital service channel signals into and out of the digital transmission system. On the drop side a first adder combines the West-to-East and East-to-West digital se... | 05/19/1987 |
| 4648108 | Conference circuits and methods of operating them A conference circuit has a plurality of ports for a corresponding plurality of conferees. Associated with the ports is a control circuit which determines whether a conferee is active, i.e. talking, or dormant, i.e. listening. The circuit applies gain to t... | 03/03/1987 |
| 4591827 | PCM coder-decoder Disclosed is a PCM coder-decoder having a construction such that a digital filter contained originally in the PCM coder-decoder is utilized on the time division basis in order to fold back a digital reception signal to a digital signal transmission side a... | 05/27/1986 |
| 4578789 | Simultaneous voice and data communication and data base access in a switching system using a tone bus or broadcast mode A combined telecommunications and data communications system operates by partitioning data wherein the PCM speech transmission data field is used to contain both digitized speech and other data in the same channel within a frame. Thus the system enables s... | 03/25/1986 |
| 4560836 | Four-wire communication line circuit and conference network comprising such circuits A four-wire communication line circuit for two or more two-wire subscriber lines, comprising a pair of amplifiers respectively connected in the line pairs of the four-wire line for each direction of transmission and a transmission direction detection circ... | 12/24/1985 |
| 4558180 | Programmable audio mixer Audio mixes for a plurality of conference locations are controllably obtained by using a matrix multiplication arrangement. The audio mixes for the individual conference locations are obtained by multiplying a dynamically determined gain matrix by an audi... | 12/10/1985 |
| 4555781 | Conversational video system having local network control A video conversational data communication network (30) in which subscribers (34, 36) may conduct conversational video textual data communications with one or more keystations (70, 602, 98) in the network (30). Each keystation (70, 602, 98) is associated w... | 11/26/1985 |
| 4523307 | Power line carrier multi telephone extension system for full duplex conferencing and intercom between telephones In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and an extension telephone over the AC electric power line available at a telephone subscriber's premises, that includes a main station for p... | 06/11/1985 |
| 4475193 | Power line carrier multi telephone extension system for full duplex conferencing between telephones In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and an extension telephone over the AC electric power line available at a telephone subscriber's premises, that includes a main station for p... | 10/02/1984 |
| 4475190 | Method and apparatus for controlling ports in a digital conference arrangement For use in multiport digital conference arrangements wherein the speech samples of selected speakers are included in an output sample for distribution to the conferees, the disclosed arrangement features a speech detector for each port and processor-contr... | 10/02/1984 |
| 4446553 | Arrangement for multiple custom calling The arrangement described herein provides for simple control and minimal program impact of a central office switching system for interfacing multiple custom calls. This arrangement employs a few simple trunks connected in a loop around configuration. The ... | 05/01/1984 |
| 4446554 | Arrangement for multiple custom calling The arrangement described herein provides for simple control and minimal program impact of a central office switching system for interfacing multiple custom calls. This arrangement employs a few simple trunks connected in a loop around configuration. The ... | 05/01/1984 |
| 4445212 | Arrangement for multiple custom calling The arrangement described herein provides for simple control and minimal program impact of a central office switching system for interfacing multiple custom calls. This arrangement employs a few simple trunks connected in a loop around configuration. The ... | 04/24/1984 |
| 4445211 | Arrangement for multiple custom calling The arrangement described herein provides for simple control and minimal program impact of a central office switching system for interfacing multiple custom calls. This arrangement employs a few simple trunks connected in a loop around configuration. The ... | 04/24/1984 |
| 4382295 | Digital conference time slot interchanger A time slot interchanger is disclosed for selecting and buffering digital signals between buses. The arrangement is particularly useful in forming conferences in a distributed digital time division system. In one embodiment, a clock is used to generate ti... | 05/03/1983 |
| 4339816 | Conferencing apparatus and methods for a frequency division multiplex communications system A conferencing apparatus for an FDM communications system employs a first available sideband for communication and a second sideband for signaling. Each subscriber in the system has dual receiving and transmitting equipment which enables a subscriber to c... | 07/13/1982 |
| 4316059 | Gain controller for a teleconferencing bridge A gain controller for normalizing signal levels from a plurality of remote stations connected to a teleconferencing bridge. Common monitoring circuitry is used to generate a clock signal, the duration of which is proportional to the magnitude of a test si... | 02/16/1982 |
| 4054755 | Conference circuit for pulse coded modulated telephony A method of providing a multi-port conference circuit for use in a telephone switching system employing pulse coded modulated signals for transmission and supervision. Samplings of coded information are employed as a source of conference data and comparis... | 10/18/1977 |
| 4016494 | Satellite communication system with improved conference facility Gross, U.S. Pat. No. 3,842,350, teaches satellite communication system in which subscribers are connected to each other by appropriate assignment of two different transmitting frequencies to two parties, each being assigned a receiving frequency matching ... | 04/05/1977 |
