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| Number | Title | Issue Date |
| 7277687 | Low power amplitude modulation detector An AM demodulator using totem pole complementary metal oxide semiconductor transistors having a feedback to provide a common gate voltage of approximately half that across the transistors in the totem pole. The AM demodulator used in a hearing assistance device and ... | 10/02/2007 |
| 7184738 | Radio apparatus In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determine... | 02/27/2007 |
| 7068788 | Data encryption for suppression of data-related in-band harmonics in digital to analog converters The present invention is related to digital to analog converter (DAC) input data encryption off-chip and decryption on-chip to suppress input data in-band harmonic leakage through package related parasitic capacitance. More specifically, the present invention relate... | 06/27/2006 |
| 7019645 | Method for managing receiver means of a transponder adapted to communicate at relatively long distance The method of managing receiver means of a transponder activates the transponder periodically during listening periods (12A, 12B; 14A, 14B, 14C) to detect a carrier and then to receive a message. If the carrier is an unwanted carri... | 03/28/2006 |
| 6952239 | Sine generation circuit, phase shift circuit and tint adjustment circuit A phase shift circuit includes a first sine generation circuit generating a sine-converted output signal (sin θ) of the phase shift input signal (θ) and a reversed sine-converted output signal (−sin θ) of the phase shift input signal (θ), a cosine generation c... | 10/04/2005 |
| 6941573 | Television distribution system for signal substitution A cable television distribution system in which the head end substitutes different channels for a plurality of separated geographic zones. The head end creates a plurality of channel spectrums and transmits the spectrums on distribution trunks such that a different ... | 09/06/2005 |
| 6937684 | Phase discriminator with a phase compensation circuit A differential phase discriminator includes a phase compensation circuit to compensate for timing drift and error for recovering timing information in a digital phase lock loop. The differential phase discriminator uses a differential phase detector to compute the p... | 08/30/2005 |
| 6927623 | Amplitude-modulated signal receiving circuit To improve the quality of the demodulated signal without altering the form in which an AM radio wave is transmitted, the received amplitude-modulated signal is converted to a single-sideband signal, and the information signal demodulated from the phase term of this ... | 08/09/2005 |
| 6847256 | Electromagnetic transponder reader A method and a circuit for demodulating a signal transmitted by an electromagnetic transponder, including a sensor of a variable which is a function of the load formed by the transponder on an oscillating circuit, a phase demodulator and an amplitude demodulator at ... | 01/25/2005 |
| 6744309 | Absolute value amplitude baseband detector Amplitude detection of a baseband electrical signal. The detection may be performed by performing full wave rectification on both an in-phase portion of the electrical signal, as on a quadrature-phase portion of the electrical signal. The output signal may be genera... | 06/01/2004 |
| 6735428 | Wireless communication apparatus A wireless communication apparatus prevents desensitization in a line signal frequency caused by clock signal harmonic. The wireless communication apparatus is provided with a receiver/demodulator for receiving a line signal of a predetermined frequency and for demo... | 05/11/2004 |
| 6512799 | Digital communication system and method for increased bit rates A digital communication system and method is provided for increasing bit-rates while maintaining the reliability of transmitted digital information and avoiding increased power demands. The communication system includes a transmitter that modulates one or... | 01/28/2003 |
| 6366164 | Integrated circuit layout for LF - signal acquisition in the case of contactless data transmission Integrated circuit layout for LF signal acquisition in the case of contactless data transmission Known circuit layouts for LF signal acquisition only provide for a very short communication distance between transponder and base unit, and consist of several... | 04/02/2002 |
| 6363105 | Flexible sliding correlator for direct sequence spread spectrum systems A flexible sliding correlator for use in a spread spectrum receiver divides baseband signal samples into different groups, associates each group with a different section of a spreading code, and combines ones of the signal samples with corresponding value... | 03/26/2002 |
| 6181198 | Amplitude and phase demodulation circuit for signals with very low modulation index An amplitude and phase demodulator circuit for signals with very low modulation index, including: amplifier circuitry adapted to amplify a modulated signal coming from a transmitter, the modulated signal being composed by a carrier and by a modulating com... | 01/30/2001 |
| 5946358 | Receiver circuit for a mobile communications system A PHS relay station demodulates a digital signal from a received radio-frequency signal by use of a reproduction clock produced from the digital signal. The relay station has an oscillator which generates a clock and a variable-ratio frequency divider for... | 08/31/1999 |
| 5912929 | Method and apparatus for performing carrier detection A digital implementation for a carrier detector. The detector determines if the carrier frequency at any instant is within a predetermined frequency band. The detector further determines if the detected frequency remains within the predetermined frequency... | 06/15/1999 |
| 5579338 | Spread spectrum receiver using partial correlations A complex baseband signal as long as one period of PN signal is divided into three sequences. The three partial signals are input to three correlators which then calculate the correlations between the three partial signals and three partial PN signals. Th... | 11/26/1996 |
| 5541958 | Clock recovery circuit of demodulator A clock recovery circuit capable of outputting decision point data without causing any slip of a recovered clock in the case of operation in a continuous mode in a demodulator in which received signals are sampled by a fixed frequency clock to obtain the ... | 07/30/1996 |
| 5469126 | I/Q-modulator and I/Q-demodulator An I/Q-modulator or I/Q demodulator circuit in which the modulating signals (2, 3) are input through the output phase transfer branches of the circuit. In relation to the RF-characteristics, a series resistor (16) and a series inductance (20) in the phase... | 11/21/1995 |
| 5452331 | Symbol lock detection implemented with nonoverlapping integration intervals A symbol lock detector for an incoming coherent digital communication signal which utilizes a subcarrier modulated with binary symbol data, dk, and known symbol interval T by integrating binary values of the signal over nonoverlapping first and... | 09/19/1995 |
| 5379456 | Multiplying saw phase shift envelope detector A radio-frequency detection apparatus including a signal input for providing an input signal and a phase shifter having a first connection and a second connection. The phase shifter includes a SAW device having a first electrical connection and a second e... | 01/03/1995 |
| 5339040 | AM demodulation receiver using digital signal processor An amplitude modulated (AM) radio receiver uses a digital signal processor, responsive to in-phase (I) and quadrature-phase (Q) component signals, to compensate for carrier energy removed by a capacitive coupling circuit. A quadrature mixer converts the r... | 08/16/1994 |
| 5121057 | Media flaw detection apparatus for a magnetic disk drive with squaring and summing of in-phase and quadrature-phase detected signals A media flaw detection apparatus having a sensitivity which is independent of the location of the flaw relative to the written test signal. The apparatus is equally sensitive to missing or extra bit defects. According to the invention, in-phase and quadra... | 06/09/1992 |
| 5095363 | Method of demodulating multi-standard TV signals and a circuit device for implementing the method A method of demodulating multi-standard TV signals consists of providing a plurality of signals at a frequency which is a multiple of a reference frequency whose value is a common submultiple of the frequencies of the multi-standard signals. Thereafter, t... | 03/10/1992 |
| 5052401 | Product detector for a steady visual evoked potential stimulator and product detector An automated visual testing system is disclosed which presents an alternating steady state visual stimulus to a patient through an optical system that modifies the stimulus image. As the image changes, the patient produces evoked potentials that change. T... | 10/01/1991 |
| 5029271 | Superregenerative detector An improved superregenerative detector including input elements for receiving a high frequency carrier signal having an amplitude envelope upon which an information signal is impressed, the detector also including a first and a second oscillator and outpu... | 07/02/1991 |
| 5006811 | Dual quadrature frequency converter A method and apparatus for modulating or demodulating a radio frequency (RF) signal which incorporates a pair of quadrature couplers. In demodulating an RF signal, an LO signal and the RF signal are each phase shifted -90 degrees by the couplers. The RF a... | 04/09/1991 |
| 4955039 | Quadrature receiver A quadrature receiver is disclosed which contains two mixers (M1, M3) in an in-phase receiving path and two mixers (M2, M4) in a quadrature receiving path for converting a received signal to a low IF. Each of the mixers is fed with an oscillator signal (O... | 09/04/1990 |
| 4945313 | Synchronous demodulator having automatically tuned band-pass filter In a synchronous demodulator for demodulating a carrier signal modulated with a useful signal, the demodulator including a filter circuit (2) for selecting the carrier signal, a limiter (3) for generating an amplitude-limited reference signal from the car... | 07/31/1990 |
| 4943982 | Baseband carrier phase corrector A baseband carrier phase corrector is disclosed which permits rapid demodulation and demodulation of varying RF input signals. The baseband carrier phase corrector receives RF signals, or alternatively, IF signals, and converts the signals to baseband. An... | 07/24/1990 |
| 4929905 | Synchronous demodulation circuit for a carrier-modulated television signal In a synchronous demodulation circuit for an IF television signal, having a passive carrier regenerator (37, 39), a quadrature component unwantedly demodulated by a synchronous in-phase demodulator (15) is compensated for by multiplying the output signal ... | 05/29/1990 |
| 4907092 | Modulating/demodulating circuit for multiplex recording/playback of data in a magnetic recording/playback system A data signal is modulated by an exclusive-OR operation applied to a carrier signal and a data signal to be recorded. Demodulation is similarly performed by an exclusive-OR operation applied to the carrier signal and signal indicative of read data. This m... | 03/06/1990 |
| 4862098 | Continuous-wave-modulation detectors using prediction methods A detector for a first continuous-wave-modulation signal is supplied an unmodulated carrier signal in addition to the first continuous-wave-modulation signal. Means are provided for modulating the unmodulated carrier signal responsive to output signal fro... | 08/29/1989 |
| 4833417 | Synchronous demodulation system with digital output A synchronous demodulation system with digital signal output contains a summation circuit receiving an input signal to be demodulated and a control signal. The output of the summation circuit is applied to a synchronous demodulator which feeds into a cont... | 05/23/1989 |
| 4726069 | A muiti-mode modulation and demodulation system and method An improved system and method for modulation, demodulation and signal processing for single sideband communications systems which provides correction for the adverse effects of rapid fading characteristics in a mobile environment. The system provides modu... | 02/16/1988 |
| 4677690 | Baseband demodulator for FM and/or AM signals A demodulator of the type employed in a "zero-IF" system uses a local oscillator for providing quadrature output signals at the center frequency of a received signal to be demodulated. The demodulator has first and second mixers for separately mixing the ... | 06/30/1987 |
| 4636736 | Variable phase signal demodulator A dual conversion variable bandwidth telemetry receiver employs a phase locked loop which controls the second local oscillator to maintain lock on the carrier frequency; the phase locked loop employing a loop filter with a variable time constant integrato... | 01/13/1987 |
| 4631485 | Synchronous demodulator for amplitude modulated signals Two circuits carry out the beating of a modulated signal, with first and second signals, respectively, each having substantially the same frequency as the carrier of the modulated signal but phased-shifted relative to one another by 90°. A commutator con... | 12/23/1986 |
| 4611177 | Signal demodulator using a multiplying digital-to-analog converter By using a multiplying digital-to-analog converter for signal demodulation in the disclosed detection scheme, the demodulating signal from the local oscillator can be in digital form without seriously affecting the detected, or demodulated, output. Specif... | 09/09/1986 |
