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| Number | Title | Issue Date |
| 4238849 | Method of and system for transmitting two different messages on a carrier wave over a single transmission channel of predetermined bandwidth In a radio broadcoast channel, an additional message is superimposed on the normal message so as to be inaudible to the listener. To accomplish this, the additional message, consisting of digital signals, is modulated on a subcarrier lying in the ear-phys... | 12/09/1980 |
| 4229792 | Bus allocation synchronization system An improved bus allocation system to control a time division multiplexed digital data bus used by a plurality of signal sources such as a number of digital processing components in a decentralized system in which there is no single entity controlling the ... | 10/21/1980 |
| 4229816 | Timing signal generation and distribution system for TDM telecommunications systems Synchronous operation of any number of digital switching units of a TDM system is maintained by interconnecting the switching units to a timing signal highway which distributes timing signals generated by sources of such signals in any one of the units. T... | 10/21/1980 |
| 4217572 | Arrangements for transmitting electrical signals between two devices which are connected by contacts A system for transmitting digital signals between a fixed transmitter and a portable receiver which are temporarily interconnected by physical contacts which employs a single pair of contacts and a bidirectional data transfer technique to enhance the inte... | 08/12/1980 |
| 4199661 | Method and apparatus for eliminating conflicts on a communication channel A method and apparatus is provided for eliminating conflicts on a communication channel, and particularly on a shared communication channel having a plurality of active stations, each capable of seizing use of the channel. A counter at each station contai... | 04/22/1980 |
| 4156112 | Control system using time division multiplexing A control system for selectively communicating a plurality of sensors with associated remote control devices includes a Master Synchronizer, a transmitter for each sensor and a receiver for each control device. A single signal line is connected to all tra... | 05/22/1979 |
| 4152543 | Installation for time multiplexing and transmitting telephone signals or data between a plurality of subscribers An installation for transmitting telephone signals or data with time multiplexing for a plurality of subscriber sets divided into a number of groups. At least one pair of multiplexing gates actuated in synchronism are employed for each group, one for tran... | 05/01/1979 |
| 4131763 | Bit switching of word synchronized data The invention relates to a digital data switch for serially bit-switching word synchronized Pulse Code Modulated (PCM) data from inlets to outlets of the switch. The switch is particularly intended for use in situations wherein PCM data words arriving at ... | 12/26/1978 |
| 4121055 | Integrated programmable commutation and signal conditioning circuit An integrated fully programmable circuit is provided, with particular usefulness in the area of telemetry, for programmed commutating of multiple data inputs and signal conditioning, wherein only one amplifier path is utilized for conditioning of all chan... | 10/17/1978 |
| 4121056 | Time division digital multiplexer apparatus A synchronous time division digital multiplexer apparatus utilizing frequency shift keying to transmit data from a plurality of parallel input channels that are sequentially sampled and converted to serial data having non-return to zero (NRZ) characterist... | 10/17/1978 |
| 4107644 | System and method for digitally transmitting well logging information A data transmission system, for a well logging system having a logging tool logging a borehole traversing an earth formation and surface equipment adjacent to the borehole for making a well log, includes a sync word generator located in the logging tool, ... | 08/15/1978 |
| 4093825 | Data transmission system A data communication system is described in which individual pulses or groups of pulses relating to specific items of information are multiplexed together to produce a pulse stream and this pulse stream is continually repeated so as to reduce the signific... | 06/06/1978 |
| 4075428 | Device for providing phase synchronism of a transit station in a digital telecommunication network A device for providing phase synchronism of a transit station in a digital telecommunication network, comprising within a phase-locked loop a voltage-controlled oscillator that has an output arranged to supply a station clock signal and a control input ac... | 02/21/1978 |
| 4074073 | Pilot receiver memory unit in a carrier frequency system A pilot receiver memory unit is described which is included in a carrier frequency system for storing the control value to the regulating amplifier of each group demodulator in the receiver. The memory unit utilizes a circulating digital shift register ha... | 02/14/1978 |
| 4071706 | Data packets distribution loop A data communications or distribution loop has a plurality of computer stations each of which introduces a delay while it examines the header of each circulating packet or block of data. An elastic synchronizing buffer, including a random-access memory, i... | 01/31/1978 |
| 4071887 | Synchronous serial data adaptor An integrated circuit synchronous data adaptor (SSDA) provides a bidirectional interface for synchronous data interchange. Internal control and interface logic including first-in-first-out (FIFO) buffer memory enables simultaneous transmitting and receivi... | 01/31/1978 |
| 4064486 | Data communications loop synchronizer A loop controller for a data communication network system formed by interconnecting a group of heterogeneous computers, batch terminals and conversational terminals in a ring or loop configuration. Each computer or terminal is connected to the communicati... | 12/20/1977 |
| 4059736 | Dual testing system for supervising duplicated telecommunication equipment Two processors UP1 and UP2, designed to test the operation of a pair of switching networks IN1 and IN2 in a telecommunication system through respective sets of peripheral interface units P11 etc. and P21 etc., are interconnected for parallel operation and... | 11/22/1977 |
| 4052565 | Walsh function signal scrambler A digital speech scrambler system allowing for the transmission of scrambled speech over a narrow bandwidth by sequency limiting the analog speech in a low-pass sequency filter and thereafter multiplying the sequency limited speech with periodically cycli... | 10/04/1977 |
| 4041392 | System for simultaneous transmission of several pulse trains A main pulse train at a main frequency and at least two derived pulse tra at submultiples of the main frequency are transmitted over a transmission path, from a transmitter to a receiver, in the form of pulses of alternating polarity. A first one of the ... | 08/09/1977 |
| 4039757 | Digital data communication network and control system therefor A digital data communication network in which bidirectional communications are established between a central station and plurality of remote terminal devices under control of the central station and in which groups of serially connected terminals are conn... | 08/02/1977 |
| 4035580 | Switching arrangement for transmitting synchronously and asynchronously occurring data A circuit arrangement for transmitting synchronously and asynchronously occurring data is described. The synchronous data are transmitted using a plesiochronous, synchronous data transmission system. Additionally, at the send side, a submultiplexer receiv... | 07/12/1977 |
| 4007441 | Method of data communications in a heterogenous environment A method of data communications for use in systems employing serial transmission techniques in a ring or loop configuration. Access to the communication network is via a communications processor and a interface unit termed a node. The communications proce... | 02/08/1977 |
| 4006314 | Digital interface for resynchronizing digital signals An elastic interface is disclosed for two communicating digital carrier systems autonomously synchronized to disparate time bases independent of each other in frequency and phase. The interface includes two arrangements, one for each direction of transmis... | 02/01/1977 |
| 3993870 | Time multiplex system with separate data, sync and supervision busses Each recurring time slot of a time division multiplex communication system is identified by a comparator in a terminator unit, using the unique combination of phase relationships among a plurality of synchronization signals. The comparator is latched duri... | 11/23/1976 |
| 3988716 | Computer interface system An interface logic circuit permitting the transfer of information between two computers having asynchronous clocks is disclosed. The information transfer involves utilization of control signals (including request, return-response, ready) to generate prope... | 10/26/1976 |
| 3969587 | Selective transmission of prerecorded voice signals to subscribers of time-sharing telecommunication system A dynamic memory UR containing n different message words, carried on as many endless signal tracks, works into a set of m temporal voice channels through a TDM switching matrix RC enabling any channel to be periodically connected, in its recurrent time sl... | 07/13/1976 |
| 3967060 | Fast reframing arrangement for digital transmission systems Reframing of digital receivers, for example, those employed in D-1 channel banks is enhanced by employing a switch to inhibit reception of transmitted signals and a signal generator to supply a prescribed signal to the receiver during intervals in which r... | 06/29/1976 |
| 3941930 | Synchronizing signal regenerator A synchronizing signal regenerator for regenerating all the required synchronizing signals from a composite signal having a plurality of synchronizing signals having a different repetition period and phase. The composite signal comprises a video signal an... | 03/02/1976 |
| 3932841 | Bus controller for digital computer system An arrangement is shown for controlling transmission of blocks of information to and from a plurality of major components of a digital computer system interconnected by common buses. The disclosed arrangement operates so that any component of the system m... | 01/13/1976 |
