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4220816 |
Digital duplex transmission system
A digital duplex transmission system for use in a local area uses a modified dipulse code from the exchange terminal to the subscriber terminal and either a different modified dipulse code or a...
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4217467 |
Amplitude and periodic phase modulation transmission system
A carrier is amplitude modulated in an amplitude modulator by a train of unipolar signals which alternately assume a definite voltage level and an arbitrary amplitude of one polarity. Either the...
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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...
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4206320 |
High speed modem suitable for operating with a switched network
A modem capable of achieving essentially 9600 bit per second information transfer rate through the switched telephone network. The high bit rate is achieved notwithstanding the variations in the...
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4184052 |
AM/FM time division surface wave device transmitter
A device for sample modulating electronic information signals which includes mixing circuitry having a first input coupled to receive information signals, a second input for receiving electrical...
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4087677 |
Digital PSK modem
In the transmitter portion a multiplexer multiplexes first digital data and first teletype signals to provide first digital data signals. The first digital data signals are converted into second...
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4079203 |
Method and apparatus for transmitting auxiliary channel over digital communications system
An auxiliary channel, for example, an engineering orderwire, is derived on n existing time-division multiplex carrier system by modulating the pulse repetition rate of the digital bitstream. The...
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4075429 |
Transmultiplexer
A transmultiplexer, in which after a pulse code modulated, time division multiplex signal of the voice band signal is converted into an analog signal, the analog signal is separated by filters into...
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4070550 |
Quantized pulse modulated nonsynchronous clipped speech multi-channel coded communication system
1. A quantized pulse-modulated nonsynchronous clipped speech multi-channel oded communication system comprising transmitter terminals and receiver terminals; said transmitter terminals comprising a...
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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...
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3908114 |
Digital Hilbert transformation system
A multiplex mechanization of a Hilbert transformation system is disclosed wherein, in a preferred embodiment, digital sine and cosine signal samples from a reference generator are selectively...
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3887873 |
Pulse amplitude modulation, frequency modulation telemetric data transmitter
A data signal telemetry system having a pulse amplitude modulation subsys, a video doppler subsystem, and a switchable external and internal power subsystem coupled and coacting to produce a...
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3873771 |
SIMULTANEOUS TRANSMISSION OF A VIDEO AND AN AUDIO SIGNAL THROUGH AN ORDINARY TELEPHONE TRANSMISSION LINE
A communication system for simultaneously transmitting a video and audio signal through the same transmission line. The transmission line can be a standard telephone line, and the video signal can...
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3860870 |
MICROWAVE RELAY SYSTEM HAVING AUXILIARY SIGNAL TRANSMISSION ARRANGEMENT
A microwave heterodyne relay system transmitting a main carrier, angle-modulated wave in combination with an auxiliary signal transmission system is disclosed. The auxiliary signal transmission is...
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3849595 |
FACSIMILE SIGNAL TRANSMISSION SYSTEM
A facsimile transmission system is disclosed which uses both amplitude and phase modulation. The amplitude and phase of the transmitted signal are selected in correspondence with the binary values...
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3764731 |
COLOR SIGNAL RECORDING AND DECODING APPARATUS
Apparatus for converting two independent functions of color saturation and hue into pulses varying in width and frequency each in accordance with one of said functions. Apparatus for scanning a...
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3754101 |
FREQUENCY RATE COMMUNICATION SYSTEM
A communication system for transmitting a plurality of analog or digital information signals to a receiver with an improvement in band width utilization over conventional systems. A system with a...
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3742149 |
A FREQUENCY DIVISION MULTIPLEX MICROWAVE COMMUNICATION SYSTEM USING POLARIZATION DIVISION MULTIPLEX TECHNIQUE
A signal transmission and reception system which includes means for transmitting a plurality of information signals each of which occupies a different frequency band. The information signals, which...
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3737776 |
TWO CARRIER COMMUNICATION SYSTEM WITH SINGLE TRANSMITTER
A pulse-code modulated communication system is disclosed for transmitting two subcarrier-modulated carriers from a single transmitter comprising two channels for phase modulating the two carriers...
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3715510 |
METHOD AND APPARATUS FOR HANDLING DATA FROM A PLURALITY OF CHANNELS
A time-multiplexing system wherein a frequency-modulated signal contains the data from a plurality of channels in time-sequential order. Each channel is represented by the same integral number of...
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3706842 |
METHOD TO DOUBLE TRANSMISSION SPEED OF TELEPHONE NETWORK FACSIMILE
Material to be sent is scanned two lines at a time and the information in the two lines is transmitted simultaneously. The first line of each pair is encoded and transmitted by a frequency or phase...
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3689841 |
COMMUNICATION SYSTEM FOR ELIMINATING TIME DELAY EFFECTS WHEN USED IN A MULTIPATH TRANSMISSION MEDIUM
A communication system for providing effective multipath transmission without intermodulation or other distortion effects normally arising from the transmission through a dispersive medium, such as...
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3659053 |
METHOD AND APPARATUS FOR FREQUENCY-DIVISION MULTIPLEX COMMUNICATIONS BY DIGITAL PHASE SHIFT OF CARRIER
A system is disclosed for subcarrier frequency multiplexing to separate independent pulse-code-modulated data streams on a common carrier by modulating the carrier in a digital-to-phase shift...
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3626417 |
HYBRID FREQUENCY SHIFT-AMPLITUDE MODULATED TONE SYSTEM
A two channel data transmission system using amplitude modulation of the frequency shifted carrier of one channel to transmit the data of the second channel. Both channels operate at the maximum...
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3623105 |
FILTERED PULSE WIDTH MODULATION COMMUNICATION SYSTEM
A communications system provides a practical means for transmitting a plurality of input information signals, such as television signals, over a single transmitter. The signals are combined or...
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3603882 |
PHASE SHIFT DATA TRANSMISSION SYSTEMS HAVING AUXILIARY CHANNELS
In a data transmission system utilizing phase shift modulation of a carrier signal to transmit pulse coded data from one station to another an auxiliary low frequency signal is transmitted between...
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3601544 |
BASEBAND FREQUENCY MULTIPLEXING SCHEME
A binary data multiplexing system is disclosed wherein data from a binary source is applied to two encoders. One encoder operates to impart a self-clocking coding to the data and to thus cause the...
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3596001 |
FREQUENCY DIVISION MULTIPLEXING
In a time division multiplex electrical signalling system having a main carrier modulated by a first group of subcarriers to produce signals in frequency bands of higher frequency than the main...
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3553367 |
FACSIMILE MULTIPLEX COMMUNICATION SYSTEM
A system for multiplexing facsimile transmission on an audio frequency carrier. The signals from a first transmitter are converted to serial digital data and used to synchronously amplitude...
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3546386 |
SATELLITE COMMUNICATION SYSTEM AND METHOD
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3499992 |
HIDDEN CHANNEL COMMUNICATIONS SYSTEM
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3499995 |
FREQUENCY AND TIME DIVISION MULTIPLEX SIGNALLING SYSTEMS USING SUCCESSIVE CHANGES OF FREQUENCY BAND AND TIME SLOT
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3440346 |
METHOD OF MULTIPLEX REPRESENTATION OF SAMPLED DATA
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3406343 |
Pm/am multiplex communication
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3406344 |
Transmission of low frequency signals by modulation of voice carrier
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3403402 |
Fm isolation transformer coupling to dual frequency transmitter antenna
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3366882 |
Pam and pwm dual modulation arrangement for doubling channel capacity
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3337850 |
Digital phase transition detector
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3260964 |
Separate amplitude and frequency modulator channels for high and low signals to prevent distortion due to carrier suppression
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3188573 |
Dual modulation communication system
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3178515 |
Plural modulation communication system
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3160812 |
Composite transmission system utilizing phase shift and amplitude modulation
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3144609 |
Signal to noise enhancement technique for binary transmission
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3137821 |
Discriminators
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3132334 |
Mixed base code generation
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3032717 |
Method and apparatus for multiplexing and delaying normal and coherent video on one delay line
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3007042 |
Communication system
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2976363 |
Modulation of selected phases of carriers for simultaneous transmission through single delay means
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2935604 |
Long range communication system
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2912492 |
Multiplex transmission system
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