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| Number | Title | Issue Date |
| 7667534 | Control interface and protocol In one embodiment, a method for a control interface includes: receiving a signal conveying bits of information over a single line; and for each bit of information, comparing the proportion of time that the signal on the single line is low versus the proportion of ti... | 02/23/2010 |
| 7626451 | Data demodulation using an asynchronous clock A method and accompanying circuitry for asynchronous data demodulation uses sorted pulsewidth measurement based on an asynchronous clock. Lock-on of the data stream by such a system is accomplished by measured pulsewidth, rather than inferred frequency. The method b... | 12/01/2009 |
| 7471143 | Apparatus and method for adaptive demodulation of PWM signal A demodulator for processing a PWM (pulse width modulation) signal includes a variable capacitor, a charging unit, a discharging unit, and a tuner. The charging and discharging units charge or discharge the variable capacitor depending on the PWM signal. The tuner d... | 12/30/2008 |
| 7358711 | Adaptive control loop A digital controller for controlling a regulated output of an output regulator. The output regulator responsive to a pulse width signal for controlling the transfer of energy between an input source and the regulated output. The digital controller including a duty c... | 04/15/2008 |
| 7336736 | Method of detecting and processing pulsed signals in a radio signal The invention allows the detection and processing in a radio signal received by a receiver, of any signal of “pulsed” type present in radio signals applied to the input of a radiofrequency receiver, the receiver having an analogue/digital converter for performin... | 02/26/2008 |
| 7336705 | Smart receiver for wireless peripherals Systems and methods for evaluating a signal containing pulses received from a wireless computer peripheral device are provided. A received signal is analyzed to measure the strength of the received signal and determine whether sources of interference exist. Correcti... | 02/26/2008 |
| 7295607 | Method and system for receiving pulse width keyed signals Provided is a method to process a pulse width coded signal. the method includes digitizing a received pulse width coded signal and transforming the digitized signal to at least one of power domain and absolute value domain. The converting produces a converted signal... | 11/13/2007 |
| 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 |
| 7076217 | Integrated radio transceiver A radio transceiver comprises a reception path, a transmission path, and a frequency generator with a programmable phase lock loop. The reception path, the transmission path, and the frequency generator share a maximum amount of common circuitry to facilitate implem... | 07/11/2006 |
| 7061979 | System and method for determining the data rate of a digital data stream A system and method for determining a minimum pulse width for a digital data stream is described herein. The minimum pulse width is used to infer the data rate for the digital data stream. A measuring cell is used to measure the pulse widths by utilizing RC time con... | 06/13/2006 |
| 7027792 | Topology for a single ended input dual balanced mixer The mixer circuit is a singled ended input to a double balanced high dynamic range mixer with only two base-emitter junctions across the supply. It provides for the use of bondwires to off chip ground as DC block and DC feed elements. The single ended input and diff... | 04/11/2006 |
| 7024223 | Systems and methods for a multi-platform wireless modem A standard interface for interfacing a wireless modem assembly with a host device comprises a primary serial interface, a secondary serial interface, and a differential serial interface for supporting communication between the wireless modem assembly and the host de... | 04/04/2006 |
| 7006936 | Pulse width measuring device with automatic range setting function A pulse width measuring device is disclosed that calculates the pulse width of a signal to be measured, based on a count value and a count clock signal. In the pulse width measuring device, the counter circuit has a plurality of bits that are divided into an exponen... | 02/28/2006 |
| 6925115 | Apparatus and method for safely handling asychronous shutdown of pulsewidth modulated output An apparatus and method for safely handling asynchronous shutdown of pulsewidth modulated output. A shutdown circuit controls asynchronous shutdown of a pulsewidth modulated stage to ensure that pulsewidth modulated signals of less duration than a minimum period doe... | 08/02/2005 |
| 6922555 | Phase interpolation receiver for angle modulated RF signals A phase interpolation receiver for receiving angle modulated radio frequency signals. The receiver comprises mixers for down-converting the received angle modulated signal to lower frequency signals, limiters, interpolation filters, and a demodulator. The mixers dow... | 07/26/2005 |
| 6865425 | State machine for a pulse output function At least one exemplary embodiment comprises a system comprising an arithmetic logic unit; a memory comprising a pre-computed table of target pulse widths, changes in pulse width, and pulse counts distributed according to a constrained semi-logarithmic distribution, ... | 03/08/2005 |
| 6775324 | Digital signal modulation system A variable aperture coding/decoding system suitable for use in a spread spectrum system provides multiple phase coding of an input NRZ bitstream. Each bit of a coded output signal is coded to encompass a predetermined different number of clock periods depending on t... | 08/10/2004 |
| 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 |
| 6198766 | Method and apparatus for adaptive pre-demodulation pulse shaping One aspect of the invention provides a method of processing an PPM encoded input signal transmission of data pulses to a data processing apparatus by processing the pulses by lengthening or shortening the pulses to a length within the predetermined accept... | 03/06/2001 |
| 6185252 | Process for decoding a digital signal and a bus system and a peripheral unit therefor In a method for decoding digital PWM signal and a bus system, a peripheral unit, and a device therefor, the digital signal is decoded by integrating the pulse width of each bit and then comparing the integration result with a reference signal. The bus sys... | 02/06/2001 |
| 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 duty cycle of the data signal, comparing the duty cycle t... | 01/02/2001 |
| 6157671 | Apparatus and method for digitally monitoring a duty cycle of a pulse width modulated signal A circuit for digitally monitoring a duty cycle of a pulse width modulated signal is provided. The circuit includes a counter portion, a digital filter, and a data storage device. The counter portion is connectable to receive the pulse width modulated sig... | 12/05/2000 |
| 5914987 | Method of recovering symbols of a digitally modulated radio signal A method of recovering a finite duration of N symbols of a digitally-modulated signal, wherein a received signal is sampled at a period T1, generating a batch of K1 samples, wherein K1 is chosen to be an integer multiple o... | 06/22/1999 |
| 5905406 | Demodulator for a pulse width modulated signal and method A demodulator for a pulse width modulated signal comprises a counter arranged to count in one direction when the PWM signal is "high" and in the opposite direction when the PWM signal is "low" to arrive at a count representative of a duty cycle. As a resu... | 05/18/1999 |
| 5864582 | Pulse width extension with analog command A method of modulating the pulse width of a pulse width signal in response to an analog signal. The steps include changing the analog signal to a digital signal, changing the digital signal to a number of counts, changing the number of counts to a time de... | 01/26/1999 |
| 5621758 | PWM Communication system A data output portion transmits a pulse signal having a pulse width according to a value of transmit data on a predetermined cycle. An H pulse width counter and an L pulse width counter measure a length of a high level period and a length of a low level p... | 04/15/1997 |
| 5553096 | Gain control using PWM A gain control circuit utilizes a PWM having its transfer function characteristics determined by a ramp and a DC supply voltage. An input signal modulates the PWM and an integrating circuit at the output of the PWM recovers a replica of the input signal. ... | 09/03/1996 |
| 5438328 | Circuit for measuring pulse width of remote control signal A circuit for measuring a pulse width of a remote control signal comprises a receiver for receiving a remote control signal exhibiting at least one pulse; an amplifier for shaping and amplifying the received remote control signal to produce a correspondin... | 08/01/1995 |
| 5367200 | Method and apparatus for measuring the duty cycle of a digital signal The technique of measuring the duty cycle of a digital signal of known repetition rate is disclosed. It makes use of the fact that the probability of the digital signal being at the high level is related to its duty cycle when the signal is sampled at a f... | 11/22/1994 |
| 5363405 | Vehicle communications network transceiver, bus driver therefor A transceiver device for use with a microcontroller and a symbol encoder decoder device (forming a node in a communications network) for transmitting and receiving variable pulse width modulated (VPWM) analog signals containing symbol messages over a comm... | 11/08/1994 |
| 5272448 | Method and apparatus to perform digital demodulation by measuring periods between zero crossings A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated sign... | 12/21/1993 |
| 5239273 | Digital demodualtor using signal processor to evaluate period measurements A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated sign... | 08/24/1993 |
| 5185765 | High speed data communication system using phase shift key coding An improved binary data communication system employs an improved VPSK encoding procedure wherein each input data bit has a bit period of M clock periods, and the data bit polarity changes are phase shift key coded with waveform widths of M/M, M+1/M, and M... | 02/09/1993 |
| 5159281 | Digital demodulator using numerical processor to evaluate period measurements A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated sign... | 10/27/1992 |
| 5140256 | PWM signal demodulation method and apparatus A PWM signal demodulation method measuring the leading edge period of a modulated signal and a time between adjoining leading and trailing edges of the signal and finding the modulation factor in terms of the ratio of the period to the time. Reliable demo... | 08/18/1992 |
| 5138320 | Skew code generator for measuring pulses width using a delay line A skew code generator for digitally quantizing the width of a pulse. A series connected string of identical voltage controllable delay elements is supplied with the pulse, which is sensed as it passes through each of the delay elements. Output signals are... | 08/11/1992 |
| 4724425 | Security and alarm system A method and apparatus are provided for transmitting from a radio transmitter which is part of a first system to a radio receiver which is part of a second system a message which includes a plurality of characters arranged in a predetermined sequence. Eac... | 02/09/1988 |
| 4617677 | Data signal reading device A data signal reading device for reading an input data signal, such as may be received from an infrared remote control device, wherein the amount of error contained in the output signal is reduced. The input signal is subjected to level decision while bei... | 10/14/1986 |
| 4593266 | Analog-to-digital converter/demodulator for FM signals An analog-to-digital converter/demodulator consists of n delay elements, each of which has a delay period longer than a preceding delay element by a fixed amount, and n pulse coincidence detectors. A ONE-SHOT responsive to the FM signal generates a pulse ... | 06/03/1986 |
| 4584691 | Timed pulse communication system A modulator and demodulator is described for a carrier frequency which is modulated by continuous pulses of different lengths time-wise, as many different lengths being provided as the number of letters, numbers, signs or even words require. The pulse gen... | 04/22/1986 |
