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7561624 |
Multi-interval line coding for high speed data communication
Binary data signal multi-line interval encoding and decoding arrangements supporting high speed data communications consistent with certain embodiments produce a signal having a plurality of pulses...
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7539257 |
Continuous phase modulation system and method with added phase pulse
A signal generator generates a coded or memory waveform having a trellis structure. A modulator is operative with the signal generator for adding at least one phase pulse to the trellis structure...
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7446621 |
Circuit and method for switching PFM and PWM
The switching method between pulse frequency modulation and pulse width modulation signals is first based on an output voltage of a power transistor to generate a corresponding pulse frequency...
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7295082 |
Pulse frequency modulation oscillating circuit for a DC/DC converter
A pulse frequency modulation oscillating circuit includes a reference voltage generator for generating a first reference voltage and a second reference voltage, a first comparison circuit for...
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7283012 |
Tri-state pulse density modulator
A tri-state pulse density modulator includes a first switch device coupled to a high voltage, and a second switch device coupled to a low voltage. An adder receives a pulse density modulation (PDM)...
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7283011 |
Method for performing dual phase pulse modulation
A modulation method, referred to as dual phase pulse modulation (DPPM), represents digital data as a series of high and low pulses whose widths represent groups of M data bits, with both the high...
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7268638 |
Apparatus and method for data rate multiplication
The invention is a method for pulse position modulating signals which are synchronized to clocked bit periods using a clock comprising the steps of generating two, three or n signals to mark the...
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7242262 |
Pulse polarity modulation circuit
In order to provide a high-speed-pulse polarity modulation circuit for realizing low power consumption and miniaturization and reducing noise occurring at a middle level which is a baseline for a...
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7164722 |
Radio communications system, transmitter, receiver, radio transmission method, radio reception method and computer program therefor
A radio communications system in which a desired signal can be accurately discriminated from interfering signals, even when signals from a plurality of transmitters are received simultaneously, in...
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7157867 |
Operating method, electronic ballast and system for resonant operation of high pressure lamps in the longitudinal mode
The operating method is based on the simultaneous use of FM and AM and is distinguished by passing through a number of steps which are used to find an optimum frequency for the AM and, in addition,...
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7119630 |
Frequency synthesizer having a more versatile and efficient fractional-N control circuit and method using vector values
A frequency synthesizer is provided having a fractional-N control circuit and method that can selectively apply any fractional ratio to a frequency divider within the feedback loop of a PLL. A...
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7109816 |
Dual port modulator comprising a frequency synthesiser
A dual-port modulator comprising a first Phase Locked Loop (‘PLL’) ( 15 ) including a first Voltage Controlled Oscillator (‘VCO’) ( 10 ), a first variable frequency divider ( 20 ), a first...
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7082153 |
Variable spacing pulse position modulation for ultra-wideband communication links
Methods and systems for generating a variable spacing pulse position modulated (VSPPM) signal for transmission across an ultra-wideband communications channel. The variable pulse position modulated...
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7075382 |
Method and apparatus for modulating a pulse signal with a bit stream
A method and apparatus for modulating a pulse signal with a bit stream is disclosed. The pulse signal is modulated by selectively inverting and delaying signal pulses within the pulse signal...
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7002425 |
Pulse modulation
A pulse modulator comprises a delay arrangement for receiving a first sequence of pulses and for delaying each received pulse several times to obtain a plurality of sequences of pulses having...
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6968002 |
Method and apparatus for time aligning data modulators using frequency domain analysis of detected output
Method and apparatus for time aligning first and second signals. The second signal is modulated by the first signal to provide a third signal. Frequency components of the third signal are then...
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6940892 |
Spread spectrum transmission apparatus, spread spectrum reception apparatus, and spread spectrum communication system
A spread spectrum transmission apparatus includes, a chip clock generation section which outputs a chip clock in one frame formed of M+L−1 chips, a frame clock generation section which outputs a...
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6911874 |
Ultra-wideband impulse generation and modulation circuit
A modulated ultra wideband pulse generation system is provided. The system comprises a pulse waveform generator circuit operable to generate an on-off pulse waveform, and a modulating circuit...
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6909337 |
Noncoherent pulse position and phase shift keying transmission/reception system and a transmission/reception signal processing method therefor
Disclosed is a noncoherent pulse position and phase shift keying (PPPSK) transmission/reception system and a transmission/reception signal processing method therefor. Transmission system has an...
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6888887 |
Frequency-shifted feedback cavity used as a phased array antenna controller and carrier interference multiple access spread-spectrum transmitter
An optical processor for controlling a phased antenna array uses a frequency-shifted feedback cavity (FSFC), which includes a traveling-wave cavity. The FSFC incrementally delays and incrementally...
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6788219 |
Structure and method for pulse telemetry
A mud pulse telemetry technique that uses a number of bits per interval based on parameters of the pulse position modulation system in order to reduce data transfer time in a pulse position...
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6639482 |
Method for regulating the working point of a modulator and associated drive unit
A method and drive unit for controlling a modulator ( 128 ) in which the working point of the modulator ( 128 ) is regulated using a regulating circuit ( 124 ) in such a way that the working point...
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6563393 |
Method and device for pulse density modulation
A pulse density modulator unit transforms an N-bit input signal representing an input value, into an output digital signal having a digital pulse density which is a linear function of the input...
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6552624 |
Method for controlling the operating range of a modulator, and an associated drive unit
Method for controlling the operating range of a modulator, and an associated drive unit, the operating range of the modulator being controlled via a control circuit such that the operating range is...
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6445737 |
Digital modulation device in a system and method of using the same
A wireless digital transmission and receiving method combines phase reversal keying with pulse position modulation. Modulation of a transmitted signal implements pulses that are of extremely short...
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6359525 |
Modulation technique for transmitting multiple high data rate signals through a band limited channel
A digital data modulator includes a source of a plurality of digital data signals having a common data bit period. A plurality of encoders each encode a corresponding one of the plurality of...
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6317457 |
Pulse density modulator
A pulse density modulator for performing a modulation process by changing a pulse density per unit time. The pulse density modulator includes a counting circuit for counting supplied clock signals,...
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6310906 |
Chaotic carrier pulse position modulation communication system and method
A chaotic carrier pulse position modulation communication system and method is disclosed. The system includes a transmitter and receiver having matched chaotic pulse regenerators. The chaotic pulse...
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6295318 |
Method and system for increasing the data rate over twisted copper pairs and other bandwidth-limited dedicated communications facilities
A system and associated methods that use separate paths to send amplified data. The method expands, or amplifies, the amount of data that can be transmitted over a dedicated bandwidth-limited...
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6242988 |
Spiking neuron circuit
A spiking neuron circuit providing a spiking output signal in response to an input current that causes a first capacitor to charge to a threshold voltage. In response to achieving such threshold,...
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6219380 |
Pulse position modulation based transceiver architecture with fast acquisition slot-locked-loop
A transceiver has a pulse position modulation (PPM) encoder, automatic gain control (AGC) circuit and timing recovery circuit. The PPM encoder illustratively has a frequency divider, slot selector,...
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6212230 |
Method and apparatus for pulse position modulation
A method and apparatus for pulse position modulation begins when a digital data stream is received. The encoding process continues by obtaining a set of bits from the digital data stream and...
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6195429 |
Arrangement in a subscriber line interface circuit
In a subscriber line interface circuit connected to a telephone line having a high potential wire and a low potential wire, an arrangement for generating a signal for determining the line voltage...
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6184916 |
Multiple-pulse, pulse width and position modulation systems and methods
Multiple pulse width and position modulation methods and systems use multiple pulse width and position modulation (PWPM) circuits driven from the same system clock and video data to provide...
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6169765 |
Apparatus and method for output signal pulse width error correction in a communications receiver
An output signal pulse width error correction circuit and method wherein errors in a data signal conforming to a communications protocol having a prescribed duty cycle are corrected by monitoring a...
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6151149 |
Method and apparatus for pulse pattern modulation
A method and apparatus for encoding data into a pulse pattern begins by encoding header data based on a first pulse encoding convention to produce a header pulse pattern. The resulting header pulse...
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6115411 |
System and method for spread spectrum code position modulation and wireless local area network employing the same
A system for, and method of, generating a spread spectrum code position modulated waveform and a wireless local area network (LAN) containing the system or the method. The system includes: (1) a...
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6108376 |
Reception and demodulation of widely spaced pulse position modulated signals
A system for receiving information encoded in a train of pulse position modulated signals and then decoding the pulse train to produce amplitude modulated signals representing the original...
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5963595 |
Method and apparatus for encoding and decoding a bit sequence for transmission over POTS wiring
A method and apparatus for encoding a bit sequence as a symbol, suitable for transmission over POTS wiring, are described. The symbol has a duration indicative of the bit sequence, this time...
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5945941 |
Pulsed radar apparatus and method employing power distribution system having reduced cost and weight and enhanced efficiency and reliability
A power distribution system (12) is provided in radar apparatus to distribute power from a 270 VDC source (60) through an intermediate power converter (70) and very high frequency (VHF)...
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5870380 |
Method and apparatus for reception of signals from several transmitters wherein each transmitter is characterized by their output pulse train
The disclosure relates to a method of reception of signals from at least two transmitters (RCi), wherein for each transmitter the data ("0", "1") are represented by the time interval (T0i, T1i)...
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5844942 |
Pulse position modulation communications protocol
A method for modulating a radio signal has the steps of: predetermining a first time interval so as to define a data word; generating a synchronization pulse, the synchronization pulse initiating a...
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5838210 |
Method and apparatus for generating a modulated signal
A method and apparatus for generating a modulated signal include a pulse modulation source (215), a pulse modulator (20) for modulating a pulsed signal, a high efficiency power amplifier (230) for...
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5764697 |
Transmitter for a radio control device
A radio control device includes a transmitter, in which a crystal type high frequency module equipped with a high frequency circuit corresponding to a frequency band of a carrier and a PLL high...
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5684871 |
Method and apparatus for multi-mode infrared data transmission
A method and apparatus for transmitting information over a wireless connection are provided. A correlation is established between a set of symbols and a set of pulse position/signal characteristic...
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5663985 |
Communication apparatus and method in a field bus system
A Manchester code signal is used as a communication signal to be superimposed onto an operating current. The amplitude value in the plus direction with respect to an average current value is made...
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5627500 |
Phase modulator having individually placed edges
A phase modulator circuit and method for generating an output signal having individually positionable edges is described. The phase modulator includes a programmable pulse generator, such as an...
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5596601 |
Method and apparatus for spread spectrum code pulse position modulation
A spread spectrum code pulse position modulated communication system is disclosed. The frequency spectrum of a transmitted signal is spread by encoding bits with a predefined spectrum-spreading...
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5586145 |
Transmission of electronic information by pulse position modulation utilizing low average power
A method and apparatus are shown for generating and transmitting very short and widely separated high frequency sine-wave pulses of electromagnetic energy into space. A transistor, a charging...
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5566207 |
Digital FM synthesizer for record circuitry
A digital synthesizer for record circuitry of, e.g., a VCR, is supplied with digital samples representing a video signal. A calculator stage, responsive to the digital samples calculates a sequence...
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