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| Number | Title | Issue Date |
| 7986195 | Digital FM modulator Provided are apparatuses and methods for digital FM modulation. In one example, a message signal is integrated by an integrator to transform the message signal into a complex signal. The complex signal may include at least two complex components that may interfere t... | 07/26/2011 |
| 7936228 | Frequency modulator and FM transmission circuit using the same An input signal is input via a first resistor to an inverting input terminal of an operational amplifier. A second resistor is provided on a feedback path between an output terminal and the inverting input terminal of the operational amplifier. A control voltage Vcn... | 05/03/2011 |
| 7750750 | Enhanced polar modulator for transmitter Enhanced polar modulator for transmitter. Within a phase locked loop (PLL), a two point modulation topology is employed in which phase information passes through a limiter (e.g., a +90° or +re/2) in which the phase information dynamic range is divide by a factor (e... | 07/06/2010 |
| 7333789 | Wide-band modulation PLL, timing error correction system of wide-band modulation PLL, modulation timing error correction method and method for adjusting radio communication apparatus having wide-band modulation PLL A broadband modulation PLL includes a PLL portion containing a voltage controlled oscillator (101), a frequency divider (105), a phase comparator (104) and a loop filter (103). A frequency-dividing ratio of the frequency divider (105 | 02/19/2008 |
| 7310587 | Programmed method and apparatus for quadrature output sensors A sensor is provided in one illustrative embodiment that includes a microcontroller that executes a program that generates quadrature output signals that indicate the change in a parameter being measured. As an example, the sensor could comprise a linear position tr... | 12/18/2007 |
| 7298220 | Method and apparatus for creating a multiple loop VCO Disclosed herein is a method and apparatus used to create an idealized voltage controlled oscillator (VCO) which allows very high modulation rates without the expected phase noise (jitter) which nominally comes from wide bandwidth VCOs. In this fashion, high quality... | 11/20/2007 |
| 7289004 | Dual port modulator The present invention relates generally to the field of frequency modulation, and in particular to dual port frequency modulators. The present invention provides a frequency modulator comprising a phase lock loop circuit (108) for receiving and modulating a c... | 10/30/2007 |
| 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 |
| 7180385 | Direct frequency modulation system having an IQ mixer in the phase locked loop A transmission arrangement includes a step-up frequency mixer that converts a modulation signal to a transmission frequency. The step-up frequency mixer is arranged within a phase locked loop that further comprises a frequency divider that is likewise supplied with ... | 02/20/2007 |
| 7180384 | Universal signal modulators Universal signal modulators structures are shown which are particularly useful for selectively generating polar-modulated digital sequences from input phase and amplitude symbols and for generating quadrature-modulated digital sequences from input first and second q... | 02/20/2007 |
| 7157985 | PLL modulation circuit and polar modulation apparatus First and second calibration signals (308, 309) are sent to a frequency divider (102) and an adder (116) of a PLL section (100A), demodulated in a demodulator (111), filtered through a low pass filter (113) and a high pass f... | 01/02/2007 |
| 7131331 | Non-destructive testing apparatus Apparatus for non-destructively testing material to enable detection of any damage sites, comprising means for generating localized heating at any damage site in the material, and means for imaging the material to enable detection of any localized heating at the dam... | 11/07/2006 |
| 7129788 | Method and apparatus for driving a direct current or voltage controlled oscillator with modulation slope feedback A d.c. signal controlled oscillator includes a frequency-determining network having a control input and a modulation input. A phase regulating loop includes the oscillator and components that provide a control signal to the control input. A circuit apparatus for dri... | 10/31/2006 |
| 7113047 | Clock generator and its control method To present a clock generator capable of spreading the spectrum of oscillation frequency by simple control in a small additional circuit, and its control method. A phase locked loop circuit is provided from a frequency phase comparator 11, an output clock sign... | 09/26/2006 |
| 7085721 | Method and apparatus for fundamental frequency extraction or detection in speech An object is to provide a method of extracting sound-source information, which method enables the characteristics of fixed points of mapping from filter center frequency to output instantaneous frequency to be detected from instantaneous data, as a value which can b... | 08/01/2006 |
| 7057467 | Light-controlled oscillator A light-controlled oscillator includes a circuit device, a detection circuit and a control circuit. The circuit device changes its characteristics when light is applied, so that a frequency of the oscillation shifts. The detection circuit detects a change of the cha... | 06/06/2006 |
| 7046721 | System and method to enhance the capacity of a communication link A method and apparatus encodes data on a clock pulse signal by phase modulating a clock pulse signal by introducing a sinusoidal jitter modulation to the clock pulse signal to selectively introduce intentional jitter at clock pulse transitions, wherein the sinusoida... | 05/16/2006 |
| 7031675 | FM transmitter An FM transmitter that can control start/idle of each of such devices as a buffer amplifier without using a sample-and-hold circuit for moving a PLL into open loop control, wherein a controller that controls a charging pump in the PLL to start/idle the FM modulation... | 04/18/2006 |
| 6961547 | Wireless transmitter incorporating a synchronous oscillator in a translation loop A translation loop signal upconverter is disclosed. Embodiments of the invention minimize nth order harmonics and spurious tones in the radio frequency output spectrum of a portable transceiver. In one embodiment, the invention is a signal upconverter, co... | 11/01/2005 |
| 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 |
| 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 |
| 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 |
| 6535561 | Dual-mode modulation systems and methods including oversampling of narrow bandwidth signals and DC offset compensation A narrow bandwidth signal, such as a narrowband FM signal, is modulated in a modulator that modulates a wide bandwidth signal, such as a CDMA signal, by oversampling the narrow bandwidth signal and applying the oversampled narrow bandwidth signal to the m... | 03/18/2003 |
| 6373883 | Radio receiver and a radio transmitter A radio receiver is adapted to receive radio signals in at least two frequency bands, in which the radio signals are modulated by information signals. The radio receiver includes a device for down-converting a received radio signal to an intermediate freq... | 04/16/2002 |
| 6369699 | Single-cable transmission device for signals and power supply of a surveillance system The present invention provides a single-cable transmission device for signals and a power supply of a surveillance system, which only requires a single cable to transmit various signals and a power supply; which transmits signals in a carrier manner, allo... | 04/09/2002 |
| 6259731 | System and method for radio-communication using frequency modulated signals A method has the steps of generating a first control message having a plurality of message symbols and a first audio message to be transmitted from a first radio-communications device to a second radio-communications device. The first audio message is sam... | 07/10/2001 |
| 6204735 | Geometrically modulated waves A novel communications method for generating specific unique information containing waveforms, for geometrically modulating a signal with those waveforms, and an apparatus for generating the waveforms, geometrically modulating carrier waves with those wav... | 03/20/2001 |
| 6130919 | Method and device for digital frequency modulation A method and device are adapted to perform digital frequency modulation. First, an input frequency modulation signal is converted into a digital signal via an A/D (Analog/Digit) adapter, then a varied carrier frequency parameter "a" for each different sys... | 10/10/2000 |
| 6100771 | Multi-signal generator It is to provide a multi-signal generator which is able to lower the cost thereof by performing modulation in a low frequency range and using an output of a frequency synthesizer commonly to all channels. The multi-signal generator for generating a multi-... | 08/08/2000 |
| 6069537 | Double mode modulator A double mode modulator, particularly, for a portable telephone, which is adapted to realize both digital and analog modulations and have a low phase noise and a reduced locking time with a device readily integrated in an integrated circuit, including: a ... | 05/30/2000 |
| 6038265 | Apparatus for amplifying a signal using digital pulse width modulators An electronic apparatus that includes a digital processor (12), a first digital pulse width modulator (304), a second digital pulse width modulator (306), a combining circuit (308), and a load (310). The digital processor (12) produces a first digital sig... | 03/14/2000 |
| 6005896 | Radio data communication device and radio data communication method A radio data communication device that can perform a packet communication with the packet configuration suitable for transmission of a large volume of data in packet communications utilizing a low rate transmission mode and a high rate transmission mode. ... | 12/21/1999 |
| 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 |
| 5945885 | Digital baseband modulator adaptable to different modulation types A digital baseband modulator having a flexible architecture that is readily adaptible to a variety of digital modulation types is provided. A symbol builder maps the input data to a series of modulation states corresponding to data symbols that are repres... | 08/31/1999 |
| 5920238 | Geometrically modulated waves A novel communications method for generating specific unique information containing waveforms, for geometrically modulating a signal with those waveforms, and an apparatus for generating the waveforms, geometrically modulating carrier waves with those wav... | 07/06/1999 |
| 5894249 | Digital and analog modulator in a simplified circuit structure A digital and analog modulator is configured in a simplified circuit structure. The modulator includes a first frequency mixer circuit for modulating a carrier with an analog signal or a sine wave component of a digital signal, a second frequency mixer ci... | 04/13/1999 |
| 5854813 | Multiple access up converter/modulator and method A multiple access digital up converter/modulator includes selectors (1606, 1608) having inputs (1602, 1604) and outputs coupled to first and second interpolating filters (1610, 1626). The output of the first interpolating filter is selectively coupled to ... | 12/29/1998 |
| 5771442 | Dual mode transmitter In a dual mode transmitter for modulating, in a digital mode, an input digital signal and transmitting a modulated digital signal and modulating, in an analog mode, an input analog signal and transmitting a modulated analog signal, a digital modulating se... | 06/23/1998 |
| 5764692 | Dual mode radiotelephone modulator A dual-mode frequency and phase RF modulator (11) for use in a transmitter of a radiotelephone. A dual-mode modulation approach is employed wherein, in the analog (FM) mode of operation, a phase modulator, such as a π/4-shift DQPSK modulator, is bypassed... | 06/09/1998 |
