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| Number | Title | Issue Date |
| 7639098 | Methods and apparatus for reducing peak-to-RMS amplitude ratio in communication signals A pulse amplitude modulation (PAM) signal generator that injects a copy of a pulse into the PAM baseband signal prior to frequency upconversion and power amplification. The pulse comprises a function of, or an extra copy of, a pulse in the PAM baseband signal. The p... | 12/29/2009 |
| 7346119 | System and method for high speed digital signaling The present invention relates in general to a method, apparatus, and article of manufacture for providing high-speed digital communications through a communications channel. In one aspect, the present invention employs adaptive or adjustable equalization circuitry a... | 03/18/2008 |
| 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 |
| 7283013 | Contactless IC card system In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase ... | 10/16/2007 |
| 7274266 | Radio frequency excitation arrangement A method is performed for influencing the signal shape of an output signal of an RF power resonance amplifier and an RF excitation arrangement including an RF power resonance amplifier. A basic signal of a basic frequency is amplified and modulated with a modulation... | 09/25/2007 |
| 7224737 | Method and apparatus employing PAM-5 coding with clock embedded in data stream and having a transition when data bits remain unchanged To significantly reduce mobile station static power consumption, and to make it possible to use a high speed asynchronous link in the mobile station, the invention uses one of the amplitude levels of, preferably, a PAM-5 (Pulse Amplitude Modulation with five amplitu... | 05/29/2007 |
| 7200184 | Data dithering apparatus and method A waveform having an amplitude that varies to thereby represent corresponding data values is dithered to further shape the waveform so that use of the dithered waveform to create a corresponding FSK signal will result in a signal having a smoothed frequency domain p... | 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 |
| 7119773 | Apparatus and method for controlling gray level for display panel An apparatus and method for controlling a gray level for a display panel driven by a plurality of scan line signals and a plurality of data line signals is characterized in that some bits of the respective data are pulse amplitude modulated and the other bits are pu... | 10/10/2006 |
| 7119720 | Precision pulse placement to form a binary pulse signal The present invention relates to a method for pulse placement to form a binary pulse signal, said binary pulse signal having a constant pulse rate being reciprocal of a constant pulse rate period, comprising the steps of generating a bit clock having a bit clock per... | 10/10/2006 |
| 7098719 | Multiplexer with clock suppression At least two inputs, at least one output and a clock source for the inputs are provided in a multiplexer. Each input balances an input signal and is coupled to a transistor circuit having two transistors with collectors commonly connected to a power potential. The t... | 08/29/2006 |
| 7016432 | Contactless IC card system In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase ... | 03/21/2006 |
| 6985540 | AM demodulator An AM demodulator includes an APC detection circuit that compares phases of an AM-modulated input signal and a signal output from a VCO. However, the APC detection circuit multiples the two signals before their comparison. As a result, even if the phases of the inpu... | 01/10/2006 |
| 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 |
| 6624712 | Method and apparatus for power modulating to prevent instances of clipping A voltage (Vo) is added to an envelope function and input into a switching modulator (105). The output of the switching modulator (VSUP) is input to a linear regulator (103) where amplitude compensation of VSUP takes place and is out... | 09/23/2003 |
| 6624711 | Method and apparatus for power modulating to prevent instances of clipping A voltage (Vo) is added to an envelope function and input into a switching modulator (105). The output of the switching modulator (VSUP) is input to a linear regulator (103) where amplitude compensation of VSUP takes place and is out... | 09/23/2003 |
| 6617818 | Voltage independent PWM base frequency generating method A DC brushless motor operation speed control method is disclosed. First, a linearly voltage dependent current source is used to charge a capacitor and the terminal voltage of the capacitor is coupled to a linearly voltage dependent base frequency level de... | 09/09/2003 |
| 6617938 | Return to zero and sampling pulse generating circuits and method for direct digital up conversion Direct up-conversion of a signal is accomplished using a sampling pulse generator circuit and a gated differential amplifier, enabled by the sampling signal. When not enabled, the output of the differential amplifier is pulled to zero. The sampling pulse ... | 09/09/2003 |
| 6535564 | Adaptive quantization in a pulse-amplitude modulated system A method and apparatus for adaptively quantizing a digital signal prior to digital-to-analog conversion during pulse shaping in a pulse-amplitude modulated (PAM) system. In the method and apparatus, scaling constants applied to the input signal prior to d... | 03/18/2003 |
| 6532260 | Pulse transmission device for use in long-distance communication A device for transmitting a pulse signal via a metallic line to a receiver end at which equalization is applied to the received pulse signal. The device includes a waveform adjustment unit which adjusts a pulse width in accordance with differences between... | 03/11/2003 |
| 6292067 | Ask modulator and communication device using the same An ASK modulator can be operated with only a positive-voltage power source. A source-voltage switching circuit that applies a positive voltage to the source of a FET when a data signal is at an L level in relation to the source of the FET is connected to ... | 09/18/2001 |
| 6269134 | Data transmission method and apparatus in pulse amplitude modulation communication system A data transmission apparatus and method in a pulse amplitude modulation (PAM) communication system that converts information to be transmitted into digital data, converts the digital signal into an analog signal, modulates the analog signal using a PAM m... | 07/31/2001 |
| 6208217 | Ask modulator with frequency dependent voltage divider An ASK modulator including a switching diode connected in series to a carrier signal transmitting path, a first resistor connected between one end of the switching diode and a digital signal input end and a second resistor connected between one end of the... | 03/27/2001 |
| 6198361 | Contactless IC card system In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include first signal output means for outputting a first output signal having a predetermi... | 03/06/2001 |
| 5854812 | Method of digital transmission of messages using dynamic-range-limited precoding A method for digital transmission of messages is indicated, in which each digital transmission symbol in a data stream to be transmitted is represented by one of several different possible signal values. The signal values of the transmission symbols are r... | 12/29/1998 |
| 5825242 | Modulator/demodulator using baseband filtering A modulation and demodulation scheme for video signals may be used for HDTV signals using VSB-PAM, analog NTSC signals using VSB-AM and digital video signals using QAM. VSB-PAM modulation and demodulation may be performed using in-phase and quadrature bas... | 10/20/1998 |
| 5767751 | Automatic gain control for pulse amplitude modulated signals The problem that signal levels may change slowly over time, e.g., as a result of ranges in temperature, is overcome by employing an automatic gain control feedback loop using a comparator, hereinafter referred to as a feedback slicer, connected to the out... | 06/16/1998 |
| 5726609 | Pulse amplitude modulator using direct digital synthesizer A method and an apparatus for forming a pulse amplitude modulated signal in association with digital modulation. In the method symbols to be transmitted are formed from bits of an incoming bit stream. In order to achieve an accurate timing even when a bit... | 03/10/1998 |
| 5583467 | Amplitude modulated RF pulse generator Device and process for the generation of amplitude-modulated radiofrequency excitation pulses. A first unit (2) delivers a radiofrequency signal of constant level and a second unit (3) delivers a modulation signal of the radiofrequency signal, formed from... | 12/10/1996 |
| 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 |
| 5459749 | Multi-level superposed amplitude-modulated baseband signal processor A multi-level superposed amplitude-modulated baseband signal processor which has simple hardware structure and a filtering effect for bandwidth and power efficiency in a digital transmission system includes a data delayer, a signal level converter, an ope... | 10/17/1995 |
| 5448206 | Systems with increased information rates using embedded sample modulation and predistortion equalization A system is described which achieves an increased rate of transmission by transmitting multiple symbols in one symbol time. The information in the overlapping symbols can be recovered if the symbol used for transmission is chosen so that a subset of the s... | 09/05/1995 |
| 5442327 | MMIC tunable biphase modulator An apparatus for providing electronically tunable biphase modulation including an input and a first switch having a first output, a second output and a first input coupled to the input. The first switch couples the first input to either the first output o... | 08/15/1995 |
| 5097229 | Modulator - demodulator transformer coupled D.C. to one Mhz information channel An analog direct current to one MHz information channel is provided, with high acccuracy and 10K volt input-output isolation. The information channel has a voltage to current converter which receives the analog input signal, and whose output is modulated ... | 03/17/1992 |
| 5081647 | Communication of a voice signal via continuous quadrature amplitude modulator A method and apparatus for communicating a voice conversation over a single telephone channel using continuously variable level quadrature amplitude modulation establishes and maintains two totally independent communication paths, each near perfect in amp... | 01/14/1992 |
| 4989219 | Midlevel carrier modulation and demodulation techniques Several techniques are disclosed for producing modulation of a carrier signal wherein each transition of the modulated carrier signal includes a midrange level and/or two midrange characteristics, the level and/or ratio of the two midrange characteristics... | 01/29/1991 |
| 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 |
| 4205241 | Quantized modulation systems A system for modulation of the amplitude of a d-c voltage, the amplitude of an a-c carrier, or the frequency of an a-c carrier by signal, in which the signal amplitude is continuously compared against a predetermined series of equally-spaced d-c voltages,... | 05/27/1980 |
| 4199697 | Pulse amplitude modulation sampling gate including filtering The present invention provides a pulse amplitude modulation sampling gate using inexpensive integrated devices having a novel feedback arrangement. The addition of a few passive components to the basic sampling gate allows the gate to coact as a three pol... | 04/22/1980 |
