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...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 8189709 | Frequency domain equalization method for continuous phase modulated signals A method for frequency domain equalization of a cyclic CPM signal received via a channel is disclosed. In one aspect, the method includes representing the received cyclic CPM signal as a matrix model comprising a channel matrix representing influence of the channel,... | 05/29/2012 |
| 8005161 | Method, hardware product, and computer program product for performing high data rate wireless transmission A method, a hardware product, and a computer program product for performing high data rate wireless transmission and reception. Minimum shift-keyed (MSK) data is transmitted by multiplexing a first MSK data stream and a second MSK data stream wherein the first MSK d... | 08/23/2011 |
| 7394862 | Multi-mode wireless polar transmitter architecture A radio transmitter within a transceiver includes a digital processor and analog circuitry for modulating and transmitting an outgoing digital signal in multiple modes of operation. The digital processor digitally modulates the outgoing digital signal to produce one... | 07/01/2008 |
| 7352795 | System and method for communicating data using constant amplitude waveform with hybrid orthogonal and MSK or GMSK modulation A communications system of the present invention includes a transmitter that is operative for combining an orthogonal Walsh modulation with a minimum shift keying or Gaussian minimum shift keying waveform to form a hybrid communications signal that carries communica... | 04/01/2008 |
| 7287165 | IC card, portable terminal, and access control method An IC card 16 according to the present invention is provided with an electronic value storing means, a request acquiring means, a verifying means, and an output means. The request acquiring means acquires an access request from display application 151 ... | 10/23/2007 |
| 7254719 | Method and system for protecting software Secure environments can be used to protect software application programs from piracy and to enforce licensing and operating conditions. To achieve these protections, a component should be selected and executed inside the secure environment. For maximum protection, t... | 08/07/2007 |
| 7209525 | Clock and data recovery with extended integration cycles Clock and data recovery circuitry includes an interleaved sampler having multiple integrators, where at least one of the integrators integrates the input data for at least two unit intervals (UIs). One embodiment includes a four-way interleaved sampler, where each i... | 04/24/2007 |
| 7206937 | IC card, portable terminal, and access control method An IC card 16 according to the present invention is provided with an electronic value storing means, a request acquiring means, a verifying means, and an output means. The request acquiring means acquires an access request from display application 151 ... | 04/17/2007 |
| 7158588 | System and method for obtaining accurate symbol rate and carrier phase, frequency, and timing acquisition for minimum shift keyed waveform The present invention relates generally to communication systems, both wired and wireless, employing a continuous phase modulation (“CPM”) waveform with a minimum shift keying (“MSK”) preamble. The present inventive system and method uses information from co... | 01/02/2007 |
| 7123665 | Method and apparatus for measuring phase error of a modulated signal A method and apparatus for generating a burst FSK signal having precisely shaped transitions between modulation states. The apparatus uses feedforward compensation of phase gain and phase preemphasis coefficients for compensating the frequency conversion gain of the... | 10/17/2006 |
| 7106807 | Method for estimating the frequency shift of a CPFSK signal A method for estimating the frequency shift of a CPFSK signal includes scanning the CPFSK signal. Intermediate signal values are determined for the scanned CPFSK signal. An estimated value (ν) is determined for the frequency shift of the CPFSK signal by assessing a... | 09/12/2006 |
| 7092914 | Methods for matching, selecting, narrowcasting, and/or classifying based on rights management and/or other information Rights management information is used at least in part in a matching, narrowcasting, classifying and/or selecting process. A matching and classification utility system comprising a kind of Commerce Utility System is used to perform the matching, narrowcasting, class... | 08/15/2006 |
| 7072414 | Gaussian minimum shift keying (GMSK) precoding communication method A premodulation precoding method precodes a data sequence in a Gaussian minimum shift keying (GMSK) modulator to improve the bit error rate performance of a coherent Viterbi receivers generating estimates of the communicated data sequence without the use of differen... | 07/04/2006 |
| 7065157 | GMSK modulation techniques This disclosure is directed to digitally implemented GMSK modulation techniques. The digital GMSK modulation techniques make use of a lookup table (LUT) and mapping logic to digitally generate GMSK waveforms. The mapping logic can significantly reduce the size of th... | 06/20/2006 |
| 6931089 | Phase-locked loop with analog phase rotator A phase-locked loop includes a phase detector which receives an input signal and a first internal periodic signal and provides a phase signal indicative of a phase difference between the input signal and the internal signal. A rotator then receives the phase signal ... | 08/16/2005 |
| 6925136 | Simultaneous frequency and phase synchronizer A frequency and phase synchronizer system comprises a processor for executing a sequence of operations, which include: a) initializing a frequency error estimate value and phase error estimate value; b) separating discrete samples of a continuous phase modulation si... | 08/02/2005 |
| 6873218 | Frequency modulator using a waveform generator A Multi-mode Loop Frequency modulator (10) for modulating a carrier signal according to various modulation pulse shapings and data signal to provide a modulated output signal (VCOout), comprises a waveform generator (12) and two multiplexors (14,38 | 03/29/2005 |
| 6771711 | Digital GMSK filter A digital GMSK filter for use for frequency modulation of a carrier signal in a GMSK transmission system is described. The GMSK filter uses a large number of individual current sources, whose current values are individually weighted. The current sources are driven v... | 08/03/2004 |
| 6600382 | Microwave phase modulator A phase modulator for direct wideband linear phase modulation of a microwave continuous wave carrier signal which is suitable for many analog and digital phase or frequency modulation techniques. Linear phase modulation range in excess of 360 degrees is p... | 07/29/2003 |
| 6420940 | Transmitter with a phase modulator and a phase locked loop A transmitter has a phase modulator and a phase locked loop that has a relatively high powered voltage controlled oscillator. The phase locked loop has a phase sensitive detector for comparing a phase comparison frequency derived from the voltage controll... | 07/16/2002 |
| 6385257 | Frequency demodulating circuit, optical disk apparatus thereof and preformating device A frequency demodulating circuit for demodulating a frequency-modulated signal expressing digital data. The circuit includes a waveform shaping circuit for acquiring a binary signal from the frequency-modulated signal and a detector for decoding the binar... | 05/07/2002 |
| 6370204 | Method and apparatus for performing digital fractional minimum shift key modulation for a very small aperture terminal A method and apparatus for performing fractional minimum shift key modulation for a very small aperture terminal. A signal with a fractional modulation which appears to be frequency shift key is generated in the indoor unit. The outdoor unit employs a nov... | 04/09/2002 |
| 6343104 | Process and system for altering the transmission mode in a mobile communication system according to the transmission quality A form of modulation that is variable in terms of its number of steps is provided in a mobile communication system using a digital modulation of a modulation carrier. The number of steps of the modulation in the respective digital transmission channel is ... | 01/29/2002 |
| 6307441 | Shape modulation transmit loop with digital frequency control and method for same A shape modulation transmit loop with digital frequency control permits spectral shaping of a digital pulse stream (12) by controlling the slew rate of the transition signal (16) between successive pulses. The loop is formed when the digital data stream i... | 10/23/2001 |
| 6185259 | Transmitter/receiver for GMSK and offset-QAM A transmitter encodes a number 2N data bits by using N data bits to select one of 2N levels of a cosine wave and the other N data bits to select one of 2N levels of a sine wave. The modulation attains the cosine wave levels at instan... | 02/06/2001 |
| 6160858 | MSK signal processing in a GPS correlator channel A method and apparatus for demodulating and decoding an MSK signal utilizing synchronous accumulation and simultaneous synchronization of reference carrier and MSK data clocks enables a GPS correlator channel in a multi-channel GPS receiver to be used for... | 12/12/2000 |
| 6097765 | Method and apparatus for performing digital fractional minimum shift key modulation for a very small aperture terminal A method and apparatus for performing fractional minimum shift key modulation for a very small aperture terminal. A signal with a fractional modulation which appears to be frequency shift key is generated in the indoor unit. The outdoor unit employs a nov... | 08/01/2000 |
| 6025758 | Method and apparatus for performing digital data signal modulation The present invention includes a method for generating a GMSK modulating signal from a serial digital data bit stream whereby the GMSK modulating signal modulates a carrier frequency signal associated with a GMSK transmitter of a digital communications sy... | 02/15/2000 |
| 6002711 | Spread spectrum communication system for error compensation of carrier frequency A transmitter and a receiver of a spread spectrum communication system for compensating carrier frequency offsets between the transmitter and the receiver. The transmitter includes: a first multiplier for multiplying a pseudo noise signal and input data i... | 12/14/1999 |
| 5991346 | Method for determining the best time to sample an information signal A method for determining the best time to sample data bits of a data bit stream of a received information signal in a digital communication system includes the steps of determining the current derivative of a respective sample of the information signal, w... | 11/23/1999 |
| 5966055 | Phase-shift modulation of a direct antenna-driving VCO Apparatus for generating the family of PSK (phase shift keyed) modulations, which include BPSK (binary PSK), QPSK (quaternary PSK), MSK (minimum shift keying) and the like. The carrier is generated with the desired digital information already phase-modula... | 10/12/1999 |
| 5963586 | Method and apparatus for parallel noncoherent correlation of a spread spectrum signal A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the ... | 10/05/1999 |
| 5881100 | Method and apparatus for coherent correlation of a spread spectrum signal A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the ... | 03/09/1999 |
| 5834986 | Direct 2nd derivative synthesis method for controlling sidelobe energy in an MSK modulated signal A method for generating minimum shift keying (MSK) modulation signals with relatively reduced energy sidelobes relative to known methods. In one embodiment, a second derivative of the phase waveform is taken and convolved with a selectable smoothing funct... | 11/10/1998 |
| 5834985 | Digital continuous phase modulation for a DDS-driven phase locked loop A system and method are provided in which a phase modulation generator is used to modulate the output signal of a DDS with a modulation index, h/N. The phase-modulated. DDS output drives a PLL, which is an upconversion stage for a radio transmitter, with ... | 11/10/1998 |
| 5825257 | GMSK modulator formed of PLL to which continuous phase modulated signal is applied A Gaussian Minimum Shift Keying modulator that provides direct modulation of a carrier signal, produced by a single microwave high power voltage controlled oscillator. A continuous phase frequency shift keyed modulated signal with a modulation index of 0.... | 10/20/1998 |
| 5796780 | Coherent modulation of CPM signals Coherent modulation schemes for CPM signals. The disclosed schemes avoid the error probability increase due to the differential encoding by using a coherent encoder. A simple demodulator can be implemented by using a Nyquist-3 CPM scheme with coherent enc... | 08/18/1998 |
| 5764693 | Wireless radio modem with minimal inter-device RF interference A wireless radio modem that may be incorporated into a host system or connected through a PCMCIA or similar port to a host system includes radio frequency modulation/demodulation circuitry employing electronic device elements that operate in a frequency r... | 06/09/1998 |
| 5754584 | Non-coherent spread-spectrum continuous-phase modulation communication system A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A spread spectrum transmitter includes a chip sequence generator for generating a chip sequence from a data stream, a switch for dividin... | 05/19/1998 |
| 5729182 | Device for continuous phase modulation by frequency synthesizer with phase-locked loop Device for continuous phase modulation, produced from a frequency synthesizer including a variable oscillator and a phase-locked loop with, in series, a frequency division circuit, a phase comparator and a low-pass filter. In order to reduce modulation in... | 03/17/1998 |
