Matches 51 - 87 out of 87 < 1 2
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5272724 Wideband signal synchronization  
In order to synchronize wideband signals in time while reducing the necessary amount of processing, a number of narrowband signals (203, 205, 207, and 209) are modulated (503) on their own...
5241538 Transmission apparatus  
Satellite transmission sometimes uses a method of modulating by a sub signal a subcarrier with a frequency set higher than that of a main signal and subjecting the main carrier to frequency...
5185591 Power distribution line communication system for and method of reducing effects of signal cancellation  
A power distribution line communication system for, and method of, reducing effects of signal cancellation at locations along the distribution line due to standing waves caused by reflections of a...
5084868 Common bus multinode sensor system  
The present invention is a multimode sensor system that transmits power down a common bus coaxial cable typically using an alternating current power source. Each remote unit connected to the...
5079525 Audio-video modulator system on IC chip  
An RF modulator comprising an FM modulator supplied with an audio signal, and AM modulator supplied with the FM modulator output and a video signal, an oscillator for generating a sound subcarrier...
4937821 Pipeline information delivery system  
An information delivery system which continuously provides sets of information which can be selected by a user. Digital data is encoded as analog signals which are used to amplitude modulate a...
4706244 Frequency multiplexed telephone system  
A frequency multiplexed system for coupling a plurality of individual telephone sets to at least one subscriber telephone line. The system includes a line adapter unit for controlling use of...
4670889 Frequency control for point to multipoint radio  
A multipoint radio system has a single node which communicates with a plurality of outstations on one frequency. The outstations using a different single frequency to communicate with the node. The...
4361886 Satellite communication system  
A loop-around doppler canceling loop is employed between a master ground minal or node and a slave ground terminal or node for translating a doppler-free reference to the slave terminal by having a...
4317194 Carrier frequency spectrum generator using logic level input pulses  
An inverter accepts the true form of a high-frequency signal at its input and provides the complement thereof at its output. The true form is applied to a first input of a first NAND-gate and the...
4271504 Frequency modulators for use in microwave links  
Frequency modulators for use in microwave link transmission systems include acoustic surface wave (ASW) oscillators. Each frequency modulator comprises two voltage control quadripole ASW...
4254495 Control system including built in test equipment for wiring harness interface testing  
A control system features built in test equipment for wiring harness interface testing, i.e., testing critical wires leading to the system from external signal sources, for reducing maintenance...
4244047 Multiplexed carrier transmission through harmonic polluted medium  
Multiplexed carrier signals modulated with digital data are transmitted through a medium polluted with harmonic signals by asymmetrically positioning the frequency of one of the carrier signals...
4170722 Apparatus and method for remote testing of a loop transmission path  
A first network can be switched into and out of connection with a lowpass filter disposed at one of the two opposite carrier terminal ends of a loop transmission path employing a double-sideband...
4155039 Two-way transmission system between a main station and secondary stations  
Each station comprises a cavity oscillator microwave transmitter/receiver employed both as transmitter and local oscillator, each secondary station being characterized by the value of its own...
4145575 Frequency-division multiplexed signal transmission system  
A frequency division multiplexing system is disclosed having a plurality of individual modulators which modulate respective modulating signals onto respective carrier frequencies. The carrier...
4130733 Frequency channel units for a FDM system  
Each of the FDM frequency channel units of a FDM system include a physically programmable voltage controlled oscillator and a phase locked loop coupled therewith responsive to a reference signal or...
4127746 Method and apparatus employing a pulsed carrier in generating single sideband signals for FDM transmission  
In the transmit circuits of one terminal, a high frequency (HF) sinusoidal carrier signal of frequency f c is combined with a low frequency (LF) pulse signal having a PRF f p to produce a pulsed...
4101834 Methods and apparatus for rejection of interference in a digital communications system  
A digital communications system of the type transmitting data on a plurality of modulated FDM carriers interspersed between harmonics of a system-wide signal and utilizing a main synchronized...
4087639 Amplitude modulated telephone carrier systems  
A plural channel amplitude modulated telephone carrier system having a plurality of transmitters to provide for the transmission of a like plurality of frequency division multiplexed, amplitude...
4001511 Channel board for telephony transmission equipment using single side band multiplexing  
A channel board which simplifies wiring. Each channel board 30-31 comprises its own controlled carrier current generator for the formation of primary groups, and preferably also for the direct...
3992589 Frequency multiplex system for transmission of telephone and videophone channels  
In a carrier frequency multiplex system for single sideband transmission of telephone channels which have been converted through the transmission position of the transmission band of the system...
3969585 Frequency-division multiplexer for telephone transmission providing for transposition of conversation and calling channels into a primary frequency group  
Multiplexer for telephone transmission coupling the calling channels containing supervisory information which are not premodulated to the premodulated conversation channels which contain the voice...
3786190 TELEMETERING SYSTEM FOR MULTI-CHANNEL DATA OVER VOICE GRADE TELEPHONE LINES  
A telemetering system for multi-channel data such as EEG data where eight channels of such data are frequency modulated by eight different carrier frequencies and transmitted over a telephone line...
3671880 DEVICE FOR GENERATING A PLURALITY OF SINUSOIDAL OSCILLATIONS IN A CARRIER TELEPHONY SYSTEM  
A device for generating carrier oscillation while using astable relaxation generators which are synchronized by a common master oscillator. The astable relaxation generators in the output circuits...
3668327 CARRIER SUPPLY FOR MULTIPLEX COMMUNICATION SYSTEM  
A carrier frequency supply including frequency dividers serves to receive a master frequency and form low frequency pulses having a high harmonic content. Filter means receive said pulses and...
3655917 FREQUENCY DIVISION MULTIPLEX SYSTEM USING THE SPECTRUM OF A PERIODIC SYNCHRONIZING PULSE FOR PHASE CORRECTION  
A transmission system for transmitting data at optimum speeds through non-optimum transmission media utilizes a plurality of subcarriers having different frequencies and a special time...
3648178 MULTIPLEX FM TRANSMITTER  
A first variable attenuator is coupled between the FDM baseband source and the FM modulator. The output signal of the first attenuator is RMS detected to provide a control signal for this...
3294913 Frequency division multiplex system for sideband transmission  
3259693 Frequency division multiplex communication system  
3195069 Signal generator having a controllable frequency characteristic  
2980767 Carrier communication apparatus  
2927966 Carrier telephone systems with carrier-shift signaling  
2895009 Channeling system for frequency spectrum transmission  
2862056 Radio communication system  
2857464 Carrier operation of multistation telephone lines  
2810787 Compressed frequency communication system  
Matches 51 - 87 out of 87 < 1 2