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| Number | Title | Issue Date |
| 7872546 | Multi mode modulator and method with improved dynamic load regulation A dual mode modulator is proposed for driving a power output stage having a serial connection of high-side power FET and low-side power FET. The dual mode modulator includes a PWM modulator operating under a PWM-frequency and a PFM modulator for controlling the powe... | 01/18/2011 |
| 7719376 | Avoidance of discontinuities when switching between modulation schemes Modulator system (1) comprising modulators (2, 3, 4) for modulating input signals (A) according to different modulation schemes (8PSK, GMSK) cause discontinuities in the output signals (F) when switching between the schemes. By providing the modulator ... | 05/18/2010 |
| 7427903 | Polar modulator and a use thereof A polar modulator has a low AM-AM and AM-PM distortion comprises a phase locked loop. The phase locked loop is designed for outputting a high-frequency signal with a frequency derived from a phase modulation signal at an actuating input of the phase locked loop. A f... | 09/23/2008 |
| 7298791 | Multiple date rate filtered modulation system for digital data In an exemplary embodiment, a multi-rate data conversion circuit receives digital data at varying data rates, receives a data rate input corresponding to the digital data and converts the digital data to a converted output based upon the data rate input. A direct di... | 11/20/2007 |
| 7289005 | Polar modulator and a method for modulation of a signal A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from a phase modulation signal at a control input of the phase locked loo... | 10/30/2007 |
| 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 |
| 7260151 | Dual phase pulse modulation system A system configured to transmit and receive data signals over a data link in serial fashion using dual phase pulse modulation (DPPM) is described. The data link may be, for example, a one or two wire unshielded twisted pair (UTP) cable. An exemplary system includes ... | 08/21/2007 |
| 7248626 | System and method of communication via embedded modulation A single subscriber line multi-point communication system is disclosed. In general, the multi-point communication system can include a first transceiver coupled to a subscriber line capable of transmitting and receiving at least two modulation methods, either of sai... | 07/24/2007 |
| 7224711 | System and method for the mitigation of spectral lines in an ultrawide bandwidth transceiver A method and an apparatus are provided for mitigating spectral lines in a wireless signal. First a code word is generated that is made up of a plurality of binary or ternary encoded pulses. Then a plurality of code-word-modulated wavelets are generated in response t... | 05/29/2007 |
| 7133462 | Method and apparatus for determining modulation scheme for retransmission in a communication system A method and apparatus for determining an optimum modulation scheme for a retransmission in a communication system supporting HARQ. When two modulation schemes are available, at an initial transmission, information is modulated in the lower-order modulation scheme i... | 11/07/2006 |
| 7113379 | DC-DC converter A switching power supply unit includes an overcurrent protection circuit section and a latch-stop release signal output circuit section. The overcurrent protection circuit section performs an overcurrent protection operation for latching and stopping the switching o... | 09/26/2006 |
| 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 |
| 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 |
| 7079589 | Serial digital communication superimposed on a digital signal over a single wire A communications system interleaves control pulses between the transitions in a serial bit stream to form an interleaved signal. The serial bit stream has a series of transitions and a series of gaps between transitions where a transition can not occur. An interleav... | 07/18/2006 |
| 7012477 | Modulation using discrete amplitude adjustment and dual digital delay lines The present invention provides a means to implement amplitude and phase modulation digitally and directly at an RF frequency that benefits from high output power without the use of amplifiers. This is accomplished by the combination of two varying amplitude and phas... | 03/14/2006 |
| 6982607 | Amplitude and phase modulation using dual digital delay vectors The present invention provides a means to implement amplitude and phase modulation digitally and directly at an RF frequency that benefits from high output power using non-linear amplifiers. This is accomplished by the combination of two constant amplitude phase var... | 01/03/2006 |
| 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 |
| 6912249 | Method and system for training a radio receiver A system and method for training a radio receiver to mitigate the effects of ISI caused by multi-path includes receiving a header of a transmitted packet at the receiver, the header containing at least one flag to identify a corresponding reference training sequence... | 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 |
| 6865235 | Multi-protocol modulator A multi-protocol modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, comprises an m-level phase shift keying (m-PSK) modulator which receives a serial input data stream and... | 03/08/2005 |
| 6862317 | Modulation technique providing high data rate through band limited channels A digital data modulator is coupled to a source of a digital data signal. An encoder encodes the digital data using a variable pulse width code. A pulse signal generator generates pulses representing edges of the encoded digital data signal. A carrier signal generat... | 03/01/2005 |
| 6741646 | Modulation technique for transmitting a high data rate signal, and an auxiliary data signal, through a band limited channel A digital data modulator is coupled to a source of a digital data signal having a data bit period, and a source of an auxiliary data signal. An encoder encodes the digital data using a variable pulse width code having edges occurring in an interval within the data b... | 05/25/2004 |
| 6671328 | Generating signals having different modulation formats A signal having one of a plurality of modulation formats is formed by encoding first data in accordance with a particular one of the modulation formats. The encoded first data is then combined with second data identifying the particular modulation format ... | 12/30/2003 |
| 6628706 | Method and apparatus for transforming a channel estimate Channel estimation is performed for a received signal, wherein different parts of the received signals are modulated using different modulation types. The channel is first estimated based on part of a received signal modulated with a first modulation type... | 09/30/2003 |
| 6539064 | Multiple data rate filtered modulation system for digital data A multi-rate data modulation circuit includes a multi-rate data conversion circuit and a modulator such as a direct digital synthesis circuit. The multi-rate data conversion circuit receives digital data at varying data rates, receives a data rate input c... | 03/25/2003 |
| 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 |
| 6091780 | Transmitting and receiving radio signals In a satellite mobile telephone a radio signal is transmitted by firstly generating (602) a digital input signal. The digital input signal is processed (703) in combination with a digital modulating signal (704) to produce a digital intermediate signal. T... | 07/18/2000 |
| 5987068 | Method and apparatus for enhanced communication capability while maintaining standard channel modulation compatibility In a radio communication system (100), enhanced communication capability is provided while maintaining standard channel modulation compatibility. At a transmitter (110, 200, 600), a first information signal is generated from data according to a predefined... | 11/16/1999 |
| 5963588 | Apparatus for modulating/demodulating signals An apparatus connects a data processing system (10) with an analog telephone line and/or an ISDN line. The apparatus modulates and demodulates data from the data processing system (10) to either of the two different telephone protocols without adding unne... | 10/05/1999 |
| 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 amplifying the modulated pulsed signal, and a harmonic red... | 11/17/1998 |
| 5675609 | Sinusoidal pulse and pulse train signaling apparatus This contribution involves the generation, transmission, propagation and selective reception of electrical, magnetic or electromagnetic energy in the form of a halfwave sinusoidal pulse signal, from one location to another, whereby intelligence input for ... | 10/07/1997 |
| 5602868 | Multiple-modulation communication system A multiple-modulation communication system includes a transmitter that modulates and transmits communication signals modulated by a first modulation technique and communication signals modulated by a second modulation technique. The first modulation techn... | 02/11/1997 |
| 5495209 | Switched-inverter modulator for producing modulated high voltage pulses A switched-inverter modulator for use in driving a load that comprises master and slave high voltage power supplies for providing output pulses that directly drive the load. A synchronized pulse generator provides pulse width tinting and synchronized ampl... | 02/27/1996 |
| 5175877 | Apparatus and method for generating an amplitude modulated RF signal An amplitude modulated RF amplifier using dual path modulation to increase operating efficiency. Both the RF drive to the amplifier and the DC power supply voltage to the amplifier are amplitude modulated. Preferably, the power supply modulation is accomp... | 12/29/1992 |
| 5020154 | Transmission link A transmission link for transmitting a sequence of signals comprising pulse and interval signals, across a transmission medium from a transmitter to a receiver circuit of a receiver, whereby each pulse signal is modulated with a frequency. At least two fr... | 05/28/1991 |
| 4931751 | Apparatus and method for producing pulse width modulated signals from digital information An apparatus is provided which is responsive to a multiple bit sample of digital information for producing a pulse width modulated signal, the apparatus comprising: a first signal match detector, responsive to a first subset of the multiple bit sample, fo... | 06/05/1990 |
| 4806881 | Multi-channel modulated numerical frequency synthesizer A four-channel multifunction digital frequency synthesizer which uses direct numerical synthesis to generate one or more complex output signals having selectable frequency, phase offset, amplitude level and waveform is provided. A waveform synthesizer dig... | 02/21/1989 |
| 4760354 | SSB pulse modulator An SSB pulse modulator which attenuates unwanted even harmonics of the carrier frequency without expensive filtering. The modulator comprises two pairs of comparators (12, 14 and 16, 18), and the sine and cosine components of the carrier signal are modula... | 07/26/1988 |
| 4651114 | Pulse repetition modulator apparatus A pulse repetition modulator apparatus having a pulse width modulator to supply a series of maximum transmitter power output bursts that have been generated with a pulse time correlation to the sampled amplitude of the voice signal input to the link. The ... | 03/17/1987 |
| 4617537 | Method for digital quadrature amplitude modulation Spectrum-converting digital filters are employed for quadrature amplitude modulation. Given the method of the invention, the frequency of the two carrier oscillations residing at 90° relative to one another amounts to one-fourth the sampling frequency an... | 10/14/1986 |
