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4389622 System for preventing transient induced errors in phase locked loop  
A system for minimizing synchronization errors in a phase-locked loop having a sequential phase detector for determining the phase difference between the output of the VCO of the phase-locked loop...
4370747 Data transmission  
A circuit arrangement for transmitting binary data elements `0` and `1` by frequency shift using two tone frequencies f0 and f1. The circuit arrangement comprises a modulator, an exclusive OR-gate...
4323862 Frequency shift modulator with circuitry for simple change-over between high and low channels  
The frequency shift modulator comprises an operational amplifier connected so as to form an integrating circuit and followed by a bistable circuit having trigger hysteresis for producing a...
4259648 One-bit frequency-shift-keyed modulator  
A shift-keyed modulator utilizes a lookup table (41) to provide a binary sequence of digits one at a time. Since the binary digits are selected so that their accumulation represents the amplitudes...
4063197 Plural transistor oscillator phase continuous frequency encoder circuit  
A frequency modulation oscillator circuit is provided having three or more output frequencies corresponding to three or more possible input signals, the output frequency being a phase continuous...
4063196 Plural oscillator phase continuous frequency encoder  
A frequency modulation oscillator is provided having three or more output frequencies corresponding to three or more possible input signals, the output frequency being a phase continuous frequency...
4021757 Phase lock-loop modulator using an arithmetic synthesizer  
A phase lock loop has a phase modulator within the loop to produce an output signal of frequency shifted or modulated RF. The modulator is controlled by input signals via an arithmetic synthesizer.
4015220 Frequency shift keyed toned generator  
A frequency shift keyed (FSK) generator producing an output frequency which is determined by gating through a selected one of a plurality of crystal controlled oscillators. The oscillator output is...
4003001 Multi-line, multi-mode modulator using bandwidth reduction for digital FSK and DPSK modulation  
A frequency shift keyed (FSK) modulator capable of substantially simultaneously modulating a plurality of binary encoded data signals at different baud rates and modulation frequencies for...
3997855 Digital FSK time rate of change modulator  
A digital FSK time rate change modulator is responsive to a digital input signal and generates either a first or a second output frequency. The FSK modulator switches from one output frequency to...
3991389 Digital frequency shift key modulator  
A frequency shift key modulator producing sine wave output signals of different frequencies for mark (1) and space (0) signal levels on an input "send data" lead including a counter which divides...
3890581 Digital FM (FSK) modulator  
A digital FM (FSK) modulator is provided which includes a programmable counter the frequency output of which varies in accordance with the data input so that the frequency is F 0 for a logical "0"...
3832637 FSK MODEM  
A low-speed FSK data modem. A crystal-controlled oscillator drives a ripple-carry binary-counter. The intermediate outputs of the counter are selectively connected to four NAND-gates which decode...
3801912 FREQUENCY MODULATION COMMUNICATION SYSTEM AND DIGITAL CARRIER GENERATOR AND DEMODULATOR FOR USE THEREIN  
A data transmitter-receiver system for transmitting information over a communication link such as a telephone line is described. The information is encoded on a carrier wave at the transmitter by...
3777269 BINARY MODULATOR FOR COHERENT PHASE-SHIFT KEYED SIGNAL GENERATION  
A binary modulator for encoding the two states of an input binary signal which is synchronized to a clock signal into two phase deviations of a frequency modulated coherent phase-shift keyed...
3773975 FSK DIGITAL TRANSMITTER  
A digital transmitter used in data sets for digitally constructing sine waves to transmit mark and space information signals over a communication channel. A medium frequency oscillator supplies the...
3752923 FREQUENCY SHIFT KEYED GENERATING SYSTEM  
A transmitter produces a plurality of frequencies for application to a communications channel by generating a number of triangular waveforms in response to a plurality of selection signals and...
3752922 CRYSTAL CONTROLLED FREQUENCY SHIFT KEYING SYNCHRONOUS GENERATING SYSTEM  
An FSK transmitter includes a crystal controlled generator which includes a counter which when cycled provides a number of output signals which are logically combined to produce pulse waveforms...
3740669 M-ARY FSK DIGITAL MODULATOR  
A M-ARY digital modulator for phase continuous frequency shift keying a digital data signal includes a pulse train generator for frequency encoding the data signal and a waveform generator for...
3731233 MINIMUM SHIFT KEYING MODULATING APPARATUS  
A minimum shift keying transmitter utilizing a voltage controlled oscillator and logic circuitry for altering the frequency output of the oscillator in accordance with the logic level of the binary...
3697892 DIGITAL FREQUENCY-SHIFT MODULATOR USING A READ-ONLY-MEMORY  
FSK signals in a digital sense are obtained from a memory comprising a table of forty numbers, representing amplitudes of points in one cycle of a sine wave, the points being separated by equal...
3671670 DIGITAL FILTER FREQUENCY-SHIFT MODULATOR  
Unity gain feedback places a second-order digital filter on the borderline of stability. The filter therefore oscillates in a numerical sense. Two feedback multipliers, each capable of determining...
3508136 APPARATUS FOR OBTAINING A CARRIER FREQUENCY SHIFTING AT A CONSTANT PHASE ANGLE IN FREQUENCY MODULATION  
3458835 FACSIMILE PHASE COHERENT SYNCHRONIZATION  
3421088 FREQUENCY SHIFT KEYING BY DRIVING INCREMENTAL PHASE SHIFTER WITH BINARY COUNTER AT A CONSTANT RATE  
3406255 Data transmission techniques using orthogonal fm signal  
3387213 Synchronous frequency modulation duobinary processing of digital data  
3263185 Synchronous frequency modulation of digital data  
3223925 Digital data modulation device  
3102238 Encoder with one frequency indicating one binary logic state and another frequency indicating other state  
3713017 Title is not available  
Matches 51 - 81 out of 81 < 1 2