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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7412008 | Programmable phase mapping and phase rotation modulator and method A modulator (10) and method provides a programmable phase rotation for supporting different modulation formats and different phase rotations. The modulator (10) includes a programmable symbol counter (32) and symbol phase rotation logic (31 | 08/12/2008 |
| 7352822 | Telephone for transmitting an uplink signal to a base station and for receiving first and second downlink signals from the base station, and a base station for receiving an uplink signal from a telephone and transmitting first and second downlink signals to the telephone At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/01/2008 |
| 7333557 | Adaptive controller for linearization of transmitter with impairments An adaptive controller for linearization of transmitters using predistortion of the input signal has reduced sensitivity to impairments such as gain variation, phase noise or modulation/demodulation frequency instability by linearizing an adaptively normalized gain ... | 02/19/2008 |
| 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 |
| 7251290 | Adaptive controller for linearization of transmitter A bank of complex gain elements is used to provide a step-wise approximation of an arbitrary complex-gain predistortion function for a nonlinear transmitter. The bank of gain elements is in an adaptive loop realizing adaptive control. The adaptive loop is closed bet... | 07/31/2007 |
| 7212585 | Quadrature modulation transmitter There is provided a quadrature modulation transmitter which is capable of solving several problems of the conventional transmitter while performing the same function as the heterodyne transmitter or the digital IF transmitter, in which a circuit structure is simplif... | 05/01/2007 |
| 7161437 | Voltage-controlled oscillator and quadrature modulator A ring oscillator of an even number of stages of inverting/summing amplifiers that adds, to an input of each of the amplifiers, a signal from one such of the amplifiers as to be distant by an even number of stages therefrom, to realize a desired oscillation operatio... | 01/09/2007 |
| 7133644 | Digital baseband system and process for compensating for analog radio transmitter impairments In order to compensate for performance degradation caused by inferior low-cost analog radio component tolerances of an analog radio, a wireless communication transmitter employs a control process to implement numerous digital signal processing (DSP) techniques to co... | 11/07/2006 |
| 7106804 | Method of and system for modulating and demodulating a communication signal using differential quadrature phase shift keying (DQPSK) A system for and method of modulating and demodulating a communication signal using differential quadrature phase shift keying (DQPSK) can include, upon receiving an inbound communication signal, demodulating the inbound communication signal by obtaining Pi/4 differ... | 09/12/2006 |
| 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 |
| 7095795 | Multi-rate transmission apparatus A multi-rate transmission apparatus wherein components operate with a single clock from the outside and, even if the modulation system and the coding rate are varied arbitrarily by switching of the modulation operation mode similarly from the outside, transmission d... | 08/22/2006 |
| 7096242 | Random number generator and generation method An RNG circuit is connected to the parallel port of a computer. The circuit includes a flat source of white noise and a CMOS amplifier circuit compensated in the high frequency range. A low-frequency cut-off is selected to maintain high band-width yet eliminate the ... | 08/22/2006 |
| 7095996 | Wireless communication system, and demodulation method and data rate control method therefor A transmitter and a receiver share a maximum number of transmission bits per symbol as a parameter. The transmitter modulates an encoded and interleaved transmission signal in accordance with a modulation scheme which enables the transmission of one bit or more per ... | 08/22/2006 |
| 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 |
| 7075336 | Method for distributing clock signals to flip-flop circuits A method for distributing clocks to flip-flop circuits which constitute a logic circuit includes obtaining a timing slack of a first minimum delay time with respect to a minimum delay constraint time and a timing slack of a first maximum delay time with respect to a... | 07/11/2006 |
| 7061994 | Methods and apparatus for I/Q imbalance compensation Methods and apparatus for performing amplitude and phase imbalance correction operations on in-phase and quadrature phase signal components corresponding to a received signal are described. The imbalance correction operations relay on the use of relatively simple to... | 06/13/2006 |
| 7027920 | Low-speed collision avoidance system A system and a method for low speed collision avoidance by a vehicle are provided. The low speed collision avoidance system includes an operation control module in communication with a plurality of signal generators for determining a distance to an object, a vehicle... | 04/11/2006 |
| 7023292 | Polar modulation using amplitude modulated quadrature signals Polar modulators include a phase splitter, a controller, variable current sources, transistor circuits, and a combiner. The phase splitter splits a RF carrier signal into quadrature component signals that are 90 degrees out of phase with each other. The controller g... | 04/04/2006 |
| 7009461 | Phase shifted binary transmission encoder, a phase modulator, and an optical network element for encoding phase shifted binary transmission The invention relates to a phase shifted binary transmission encoder with data input and data output, where the phase shifted binary transmission encoder includes an exclusive or gate having two inputs and one output, the output of the exclusive or gate being the ou... | 03/07/2006 |
| 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 |
| 6928123 | Wireless network with enhanced data rate A high-speed transmitter for digital data having a variable data rare, the transmitter comprising a convolutional encoder, adapted to generate, for each group of k input bits in a bitstream, n coded output bits, such that k and n are integers, n equal to or greater ... | 08/09/2005 |
| 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 |
| 6870435 | Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture The invention relates to a system for electromagnetic processing of an input wave involving receiving a modified signal derived from two or more signals that represent the input wave when combined; and alternately regulating the modified signal using a digital signa... | 03/22/2005 |
| 6766148 | Switched sideband frequency low-IF transmitter A transmitter for transmitting a high frequency transmit signal generates a low intermediate frequency quadrature signal, and up-converts the low intermediate frequency quadrature signal to the high frequency transmit signal. The frequency spectrum of the high frequ... | 07/20/2004 |
| 6747524 | Modulator and demodulator A modulator for modulating carrier wave signals with an in-phase component signal and a quadrature component signal includes a fixed frequency signal generator for generating two fixed-frequency signals differing 90 degrees in phase, a variable frequency signal gene... | 06/08/2004 |
| 6696900 | Method for demodulating PSK modulated signals The present invention is a method for demodulating a PSK modulated signal wherein the PSK system incorporates a transmitter generating a PSK modulated signal and wherein the transmitter is crystal based. A crystal based receiver receives the PSK modulated... | 02/24/2004 |
| 6670861 | Method of modulation gain calibration and system thereof A wideband impedance attenuator includes a phase-locked loop filter, a voltage-controlled oscillator connected to the phase-locked loop filter during transmit, and an impedance circuit connected to the phase-locked loop filter and the voltage controlled o... | 12/30/2003 |
| 6621366 | Parallel-process digital modulator structures and methods In order to generate a carrier frequency Fc, a digital modulator must operate (to satisfy the Nyquist criteria) at a system sample rate Rs which is at least twice the carrier frequency Fc. However, digital modulator struct... | 09/16/2003 |
| 6531935 | Vector modulator An analogue phase shifter with vector modulator is envisioned. The analogue phase shifter has an input stage that provides the generation of a pseudo-basis of four vectors. The analogue phase shifter has a multiphase filter. The analogue phase shifter has... | 03/11/2003 |
| 6498818 | Method and system for transmitting information by means of phase modulation A method and system for transmitting digital data by means of phase modulation is characterized in that the data are coded at the transmitting end with a code after the fashion of the Differential Manchester Code and are then phase-modulated, and in that ... | 12/24/2002 |
| 6434199 | 2N-QAM macrocell A 2N -QAM macrocell for generating constellations with 2N symbols, where N is the number of bits in the digital data word [D0 :DN-1 ] applied to the macrocell. Since the digital data word is applied directly to ... | 08/13/2002 |
| 6424682 | BPSK encoder circuit A BPSK encoder is provided with a first circuit which processes a carrier signal and a binary signal to be encoded, and produces an output binary signal having synchronous phase shifts representing a change in the value of the signal to be encoded. Also, ... | 07/23/2002 |
| 6342821 | Device capable of QPSK modulation and phase compensator for the same A device and method capable of QPSK(Quadrature Phase Shift Keying) modulation, which up-converts a baseband signal to an IF(Intermediate frequency) signal. A phase compensator receives a digital I-signal (In-Phase signal) and a digital Q-signal (Quadratur... | 01/29/2002 |
| 6320912 | Digital modulator There is disclosed a digital modulator whose modulation parameter can be controlled and in which modulation data or modulated signals are prevented from generating interference signals with adjoining circuits through control when power supply is turned on... | 11/20/2001 |
| 6194977 | State variable-based table-driven modulation signal generation Dibits (i.e., pairs of bits) in an input data stream are converted into a modulation signal (e.g., a π/4-DQPSK modulation signal) using a technique that relies on pre-computed filter output values to reduce the processing required to generate each sample... | 02/27/2001 |
| 6184756 | Modulator A low frequency signal generating portion 1 generates a first discrete signal (a signal sampled at a first sampling rate f1). A band pass portion 2 operates at a second sampling rate f2, performs a frequency selecting operation to a ... | 02/06/2001 |
| 6169463 | Quadrature modulator with set-and-forget carrier leakage compensation A quadrature modulator with set-and-forget carrier leakage compensation. The quadrature modulator comprises an in-phase and a quadrature branch. In the in-phase and quadrature branches, real-time digital signals are converted to analog signals, the analog... | 01/02/2001 |
| 6163230 | Phase-shift keying electronic circuit with distributed structure The invention concerns a modulating electronic circuit with m phase status mࣙ2 comprising a distribution line (6) with n similar dephasing cells (Ci) nࣙ2, each comprising a transistor supplying on a derivative output (ODi) an out-of-phase signal (SDi)... | 12/19/2000 |
| 5990755 | Phase modulator efficiently utilizing waveform storing section Ramp period detecting circuit 101 outputs signal Tc that indicates the start and end of the ramp period. Two-dimensional quadrature coordinates (I,Q) and (Iଲ,Qଲ) are output alternately. Coordinate accumulator 106 accumulates I&#x... | 11/23/1999 |
| 5859869 | Low cost binary phase shift keying modulation transmitter system An improvement in spread spectrum modulator systems, and more particularly further improvements in spread spectrum BPSK, or Binary Phase Shift Keying, Modulation systems, the present invention contemplating the utilization of an exclusive OR logic gate to... | 01/12/1999 |
