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8548030 |
Relay apparatus
A relay apparatus, comprises a reception section that receives real-time data, a monitoring section that periodically detects quality of a transmission path to be used for transmitting the... |
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8509288 |
Spatial multiplexing gain for a distributed cooperative communications system using randomized coding
Multiple cooperative relays operate in a highly mobile environment and form a virtual antenna array. Multiple independent streams of data can be simultaneously, transmitted in parallel to the... |
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5303261 |
High-throughput pipelined communication channel for interruptible data transmission
A high-throughput bidirectional data communication channel is formed of a pipelined plurality M of stages, connected to the input/output (I/O) port of each of the pair of devices using the... |
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5132987 |
Bidirectional communication line buffer apparatus
The invention relates to a bidirectional communication line buffer apparatus in which the communication direction of data of a bidirectional data line and the length of the data are judged. A... |
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4841551 |
High speed data-clock synchronization processor
The present invention generates a data clock for data processing circuitry by developing an optimum locally generated clock signal which is selected with each received data message. This is... |
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4837778 |
Circuit arrangement for time-regeneration of broadband digital signals
A circuit arrangement for time regeneration of digital signals comprises a correction circuit and a control circuit containing a low-pass filter. For time regeneration of broadband digital signals... |
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4680772 |
Digital signal repeater including means for controlling a transmitter
A digital signal repeater system, including means for controlling the transmitter of the system. The system is substantially immune to fading, interference and noise, and rapidly detects the... |
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4670886 |
Receiver/driver/repeater interface
A repeater circuit for repeating data on a communication channel, the repeater circuit having two receiver/driver circuits arranged in repeating fashion and having a control circuit for... |
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4628307 |
FET switch for high frequency signals
A solid state switching network includes three FET switches or devices arranged in a substantially "T" (or inverted "T") configuration. The network is controlled so that in an "OFF" or... |
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4626845 |
Subscriber validation system
A system provides for the validation of users of a trunked radio system. The system includes a controller and at least one microcomputer-controlled repeater module for user identification and... |
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4553247 |
Telemetry system with signal booster for digital data transmission through a transmission line
A telemetry system for sensing remote physical events and for transmitting and boosting a digital data signal representing the sensed events on a transmission line, which comprises a master clock... |
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4468785 |
Telemetry system with signal booster for digital data transmission through a transmission line
A telemetry system for sensing remote physical events and for transmitting and boosting a digital data signal representing the sensed events on a transmission line, which comprises a master clock... |
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4374305 |
Arrangement for regenerating start-stop signals and dial pulses
Described is the regeneration of dial pulses in the signalling system CCITT type B. The dial pulses are regenerated by a combined regeneration process comprising a reduced process with two... |
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4322849 |
Data relay system
A data relay system transmits addresses from a host device sequentially to each of a plurality of data relays and for transmitting data sequentially through each of the plurality of data relays to... |
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4300018 |
Electronic relay arrangement
An electronic relay arrangement that is suitable for use as a repeater in systems for single-current as well as double-current telegraphy comprising an input circuit, an output circuit and a... |
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4255812 |
Signal regenerating apparatus with DC compensation
In known signal regenerating apparatus a high frequency signal is continuously applied to the secondary side and inductively coupled back to a resonant circuit on the primary side. The resultant... |
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4207528 |
Timing-phase control system for duobinary transmission
A timing-phase control system provided on the receiving side of a duobinary transmission system is adaptable to high-speed PCM repeater systems using a wide-band transmission medium such as a... |
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4175213 |
Regenerator having automatic gain control referenced to a data-pattern-dependent pulse stream
A roving reference automatic gain control (AGC) arrangement is used in a regenerator of a pulse code modulation (PCM) transmission system. An adjustable gain circuit receives a sequence of data... |
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4123625 |
Digital regenerator having improving noise immunity
A digital repeater for the regeneration of partial-response signals having improved noise immunity which basically comprises an equalizer followed by a regenerator. A band limiting filter disposed... |
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4122358 |
Supervisory system for a data transmission system
In a data-transmission route involving parallel (e.g. 8Mb/s) data-transmission systems each using a separate line pair, a common line pair, linking all terminal and repeater stations, is used for... |
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4101734 |
Binary to multistate bus driver, receiver and method
A binary to multistate line driver and remote receiver includes a line driver comprising first and second injection logic encoder circuits. The circuits have current injectors and are connected to... |
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4088850 |
Remote supply system for a cable transmission line with repeaters subjected to the influence of external electric fields
The invention relates in particular to remote supply with AC of repeaters a transmission line with symmetrical pairs. It provides a remote supply system in which the AC remote supply passes... |
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4078157 |
Method and apparatus for regenerating a modified duobinary signal
In PCM transmission, it is well known to transmit 24 voice-grade channels at a bit rate of 1.544 Megabits per second (Mb/s). The number of channels which may be transmitted in about the same... |
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4078159 |
Modified duobinary repeatered span line
An end-office repeater accepts a high-speed bipolar signal, converts the bipolar signal into a unipolar signal, scrambles the unipolar signal, and encodes the scrambled unipolar signal into a... |
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4029907 |
Asynchronous digital repeater
An asynchronous, regenerative, digital repeater for use in bipolar digital signalling systems includes an amplifier for receiving and amplifying incoming signals, a first monostable multivibrator... |
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4011406 |
PCM regenerator
A PCM regenerator including an amplitude decision device, a time decision device which includes an input transformer with its secondary connected to a pair of transistors which form a push-pull... |
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4007329 |
Data communications system with improved asynchronous retiming circuit
A data communication system for asynchronously transmitting intermittently generated digitally encoded data between a data processor and a plurality of data terminals associated therewith is... |
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4004091 |
Bidirectional line driver
A bidirectional line driver circuit for transmitting logic signals on a highly capacitive, or low impedance transmission line makes use of a tandem connection of switching means for providing a... |
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4000364 |
Regulated pulsed current telegraph adapter
A regulated current pulse is generated for use in transferring digital data from low level voltage devices to those requiring substantially high current such as teletypewriters. By utilizing low... |
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3992581 |
Phase locked loop NRZ data repeater
A phase locked loop repeater for reshaping a non-return to zero (NRZ) data stream. A transition detector receives the input data stream from a coaxial cable in a degraded condition in terms of... |
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3983324 |
Full duplex driver/receiver
The present disclosure describes semiconductor devices and circuits for sending and receiving data at high speed between computer modules with excellent noise immunity and low drive power. The... |
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3980973 |
Line device for transmission lines having coaxial cables for the transmission of digital or analog signals
A line device for transmission lines having coaxial cables for the transmission of signals, in particular digital signals or analog signals, employs an input equalizer in the form of a line... |
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3976835 |
Supervisory systems for telecommunication line transmission system
A repeater for a digital data-transmission system using a disparity-displaying digital code comprises a digital regenerator and error-detecting means therefor and in which supervisory control... |
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3904824 |
Automatic gain control for encoded data
Automatic gain control is provided for a transmission system wherein the data is transmitted in frames including one or more flag bits. Circuitry is included for selecting one of the flag bits and... |
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3818360 |
REGENERATIVE REPEATER OUTPUT STAGE FOR BIPOLAR CODED MESSAGE SIGNALS
An output stage for a bipolar coded signal amplifier, having two pairs of input terminals receiving signals of the same polarity, and one pair of output terminals delivering bipolar signals. It... |
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3760111 |
PULSE REGENERATIVE REPEATER FOR A MULTILEVEL PULSE COMMUNICATION SYSTEM
Disclosed herein is a pulse regeneration repeater system which includes means for extracting from a train of multi-level code pulses the clock signal defining the bit interval. Received code... |
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3757051 |
REGENERATIVE REPEATER FOR PCM SIGNALS TRANSMITTED IN THE ALTERNATE POLARITY MODE
A regenerative repeater for alternate polarity PCM signals is disclosed that does not require an equalizer or amplifier. The PCM signals are directly detected by (1) determining whether the slope... |
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3745249 |
REGENERATIVE TRANSMISSION SYSTEM FOR DIGITAL SIGNALS
A repeater for binary signals, inserted in a transmission path, includes in its input circuit a narrow-band filter with a pass band whose midfrequency substantially equals half the basic pulse... |
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3710022 |
SAMPLING AND RETIMING CIRCUIT FOR PCM REPEATERS
In a system for the transmission of information coded in terms of the presence and polarity of pulses in a signal pulse train, a circuit for reconstituting degraded pulses comprising a source of... |
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3699273 |
ECHO SUPPRESSION GATE FOR DIGITAL CODE WORDS INCLUDING NOISE INSERTION
Apparatus for suppressing echoes in digital speech transmission systems includes a serial-to-parallel converter, a buffer store and a parallel-to-serial converter. Digital code words propagating... |
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3681529 |
COMMUNICATIONS APPARATUS FOR TRANSMITTING AND RECEIVING SYNCHRONOUS AND ASYNCHRONOUS DATA
Bipolar pulses received over a communications line are restored to a bilevel signal condition. A sync signal is also developed from the received bipolar pulses. Local terminal means are provided... |
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3671875 |
DIGITALLY OPERATED SIGNAL REGENERATOR AND TIMING CIRCUIT
A digitally operated signal timing circuit employs a single synchronous up-down counter with overriding set and reset in combination with a group of flip-flops and logic gates. In effecting the... |
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3671886 |
METHOD AND APPARATUS FOR AUTOMATIC GAIN CONTROL
Disclosed herein is automatic gain control circuitry for a transmission line of a PCM regenerative repeater, wherein such circuitry uses multistage variable equalizing networks. Each network has a... |
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3659055 |
PULSE SIGNAL REPEATER
A pulse signal filter for repeating high-low input level dial pulses wherein an output flip-flop is settable into one of two stable states to apply to an output circuit a high or a low signal... |
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3651265 |
BIPOLAR REPEATER
The invention relates to a bipolar repeater to be used in any system in which the transmission of information takes place by means of pulses in bipolar or pseudo-ternary form. The sensitivity of... |
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3647966 |
APPARATUS FOR CONNECTING TRANSMISSION CHANNELS
Apparatus for connecting telegraph channels by control from a central control member having access to respective sections to be connected, including a transmitter and a receiver connected in... |
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3646451 |
TIMING EXTRACTION CIRCUIT USING A RECIRCULATING DELAY GENERATOR
A timing circuit generates the timing signal used in the regeneration of pulse code modulation signals by taking a previously regenerated signal and inserting pulses where they are missing from... |
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3643026 |
RETRANSMITTING APPARATUS FOR CONVERTING INTERRUPTED TELEGRAPHIC MODULATED SIGNALS INTO TELEGRAPHIC SIGNALS WITHOUT INTERRUPTIONS
A telegraphy retransmitter receives bipolar modulated signals interrupted by telegraphic modulation equipment and retransmits the bipolar modulated signals without the interruptions. The... |
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3626095 |
REGENERATING REPEATING SYSTEM FOR START-STOP TELEGRAPH SIGNALS
Disclosed herein is a regenerative repeating system for start-stop serial telegraph signals of a plurality of channels by the use of a time-divisional serial-parallel signal converter and a... |
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3609239 |
FAIL-SAFE PULSE REPEATER
The invention relates to a fail-safe signal repeater for receiving and repeating a signal from and to an electrically continuous rail. The signal repeater includes an input circuit electrically... |