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| Number | Title | Issue Date |
| 8044744 | Time modulation with cosine function A method and apparatus is described for a time modulated signal. A cosine function is used as the basis for the signal with time intervals at the maximum and minimum values of the cosine function defining the encoded data. The received waveform is twice differentiat... | 10/25/2011 |
| 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 modulation signal. Next, it is determined whether the corresponding pulse... | 11/04/2008 |
| 7362826 | Receiver including an oscillation circuit for generating an image rejection calibration tone A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by respective amounts to derive a desired calibration tone frequency and a desir... | 04/22/2008 |
| 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 comparing a state signal with the first reference voltage, a second compar... | 11/13/2007 |
| 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) input signal and a latched input signal to generate an output sum si... | 10/16/2007 |
| 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 and low pulses representing successive M-bit groups. Each of the 2 | 10/16/2007 |
| 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 presence of digital ones during corresponding n time slots occurring du... | 09/11/2007 |
| 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 bipolar pulse, a modulation circuit for converting a unipolar pulse in... | 07/10/2007 |
| 7199677 | Frequency modulation apparatus A frequency modulation apparatus 100 has a synthesizer 101, a differentiator 102 that differentiates phase modulation data and generates differential phase modulation data, an adder 103 that adds together that differential phase modulatio... | 04/03/2007 |
| 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 which a transmitter communicates information using signals that are r... | 01/16/2007 |
| 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, to define an optimum AM level. An electronic ballast which has a mem... | 01/02/2007 |
| 7130112 | Optical amplifying device The optical amplifying device comprises a DFB laser 22 formed on an n type InP substrate 10, for outputting control light; a symmetrical Mach-Zehnder interferometer 12 formed on the n type InP substrate 10 and including 3 dB optical coupl... | 10/31/2006 |
| 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 special digital delta-sigma modulator can be implemented as the control c... | 10/10/2006 |
| 7116160 | Booster A booster includes a boosting circuit and a feedback control circuit. The boosting circuit is used to boost an input voltage into a predetermined output voltage; the feedback control circuit detects the output voltage of the boosting circuit and stops boosting the v... | 10/03/2006 |
| 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 multi-accumulator sequence generator (21) respo... | 09/19/2006 |
| 7106130 | Variable frequency PWM controller circuit The present invention discloses a circuit that generates a variable frequency pulse width modulation (VF PWM) signal. Different from the conventional PWM controller, the frequency and duty cycle of the output PWM signal vary with the error-amplified voltage of the f... | 09/12/2006 |
| 7103109 | Randomly inverting pulse polarity in an UWB signal for power spectrum density shaping A method eliminates spectral lines in a time hopping ultra wide bandwidth signal. First, a train of pulses is generated from input symbols. The pulses are then modulated in time according to symbols. The modulation can use pulse position modulation and time hopping.... | 09/05/2006 |
| 7103110 | Dual phase pulse modulation encoder circuit An dual phase pulse modulation (DPPM) encoder circuit converts data into a series of high and low signal pulses, each of whose time durations or pulse widths represents a group of M data bits, with the alternating high and low pulses representing successive groups. ... | 09/05/2006 |
| 7092427 | Direct sequence modulation using time, frequency, and/or on-off keying A pair of radio frequency communication devices and a communication method are provided according to the invention. A transmitter includes a data source providing a data stream and a radio frequency modulation device. The radio frequency modulation device communicat... | 08/15/2006 |
| 7088797 | Phase lock loop with cycle drop and add circuitry Phase locked loops that can adjust the frequency of a clock signal are provided. A transmitter adjusts its data transmission rate in response to the clock signal to accommodate different data transmission protocols. A phase locked loop can add or drop cycles from an... | 08/08/2006 |
| 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 spread spectrum signal is created by encoding every M input data bit... | 07/25/2006 |
| 7079577 | Wide window decoder circuit for dual phase pulse modulation A dual phase pulse modulation (DPPM) decoder circuit processes a DPPM signal, which is in the form of a series of high and low pulses whose pulse widths represent successive groups of M data bits, so as to recover data carried by the signal. Each of the 2M | 07/18/2006 |
| 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 responsive to bits within the bit stream. ... | 07/11/2006 |
| 7053727 | Trimming of a two point phase modulator Method and system are disclosed for automated calibration of the VCO gain in phase modulators. The method and system of the invention comprises synthesizing, in a phase modulator, a signal having a given output frequency using a controlled oscillator having a freque... | 05/30/2006 |
| 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 different phases. The pulse modulator further comprises a selection compon... | 02/21/2006 |
| 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 determined, the frequency components being indicative of time alignment b... | 11/22/2005 |
| 6958635 | Low-power direct digital synthesizer with analog interpolation An MN counter with analog interpolation (an “MNA counter”) includes an MN counter, a multiplier, a delay generator, and a current generator. The MN counter receives an input clock signal and M and N values, accumulates M for each input clock cycle using a modulo... | 10/25/2005 |
| 6947493 | Dual phase pulse modulation decoder circuit A dual phase pulse modulation (DPPM) decoder circuit processes a DPPM signal, which is in the form of a series of high and low pulses whose pulse widths represent successive groups of M data bits, so as to recover data carried by the signal. Each of the 2M | 09/20/2005 |
| 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 frame clock synchronized to frame occurrence timing, SS-PPM signal ge... | 09/06/2005 |
| 6919779 | Folded magnetostrictive wave guide A magnetostrictive system is shown wherein there is included a wave guide but no return wire. The wave guide is folded and acts as the completed wire (whether solid or hollow) for conducting current for the current input pulse. ... | 07/19/2005 |
| 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 operable to receive a modulating signal and to modulate the on-off pulse w... | 06/28/2005 |
| 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 information generation unit for generating information data; a modulatio... | 06/21/2005 |
| 6903619 | Electromagnetic wave transmitter systems, methods and articles of manufacture A transceiver and transmitter are shown. A baseband processor receives a signal for transmission. It converts the signal into amplitude and phase polar components. Each component is then processed—the phase component through a wideband phase modulator and the ampl... | 06/07/2005 |
| 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 frequency shifts optical signals circulating in the traveling-wave ca... | 05/03/2005 |
| 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 modulation system. More particularly, depending on parameters of the pulse p... | 09/07/2004 |
| 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 is stable in relation to the transmission characteristic curve o... | 10/28/2003 |
| 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 value. The pulse density modulator unit includes a first puls... | 05/13/2003 |
| 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 stable over a long period of time and in different operat... | 04/22/2003 |
| 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 duration to indicate ones and zeros. These pulses can be a... | 09/03/2002 |
| 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 digital data signals using a variable pulse width code having ed... | 03/19/2002 |
