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| Number | Title | Issue Date |
| 8120419 | Apparatus for type-A demodulation and integrated circuit card including the same A type-A demodulator comprising a first rectifier configured to rectify a radio frequency (RF) signal received through an antenna and output a first voltage, a second rectifier configured to rectify the voltage of the RF signal received through the antenna and outpu... | 02/21/2012 |
| 7535290 | AM radio receiving circuit An AM radio receiving circuit is disclosed that comprises a front end circuit that converts an input AM modulation signal to an intermediate frequency signal that in turn is output; a pulse noise detecting circuit that detects pulse noise included in the AM modulati... | 05/19/2009 |
| 7456683 | Amplitude error compensating device and quadrature skew error compensating device An amplitude error compensating device comprises an amplitude correcting section for performing amplitude correction with respect to an in-phase component and a quadrature component of a complex signal obtained by quadrature demodulation, based on amplitude error in... | 11/25/2008 |
| 7362814 | Memoryless spectrum correction algorithm for non-ideal I/Q demodulators An algorithm for correcting the output of an analog I/Q demodulator without the need for calibration or storing state information. The output of the analog I/Q demodulator is digitized, and the discrete-time samples are divided into segments. A digital frequency tra... | 04/22/2008 |
| 7333778 | System and method for current-mode amplitude modulation An amplifier circuit includes a power amplifier biased for saturated mode operation, and a controllable current source to provide supply current to the power amplifier. The controllable current source effects desired amplitude modulation of the output signal from th... | 02/19/2008 |
| 7330269 | Single sensor ring laser gyroscope A ring laser gyroscope is described which includes a laser cavity configured to provide an optical laser path for a pair of counter-propagating laser beams, an optical sensor configured to receive a portion of the energy from the counter-propagating laser beams, and... | 02/12/2008 |
| 7290435 | Method and apparatus for electronic cancellation of quadrature error Methods and apparatus are provided for detecting a rate of rotation. In one implementation, the method includes vibrating a proof mass at a pre-determined frequency in a drive axis. In response to a rotation, sensing an amount of deflection of the proof mass in an a... | 11/06/2007 |
| 7265610 | Error detection in a signal in amplitude modulation A method and a circuit for detecting a modulation factor in a signal received in amplitude modulation, including comparing the received signal with two first values, comparing the received signal with two second values ranging between the first two values, and consi... | 09/04/2007 |
| 7260163 | Noise blanker using an adaptive all-pole predictor and method therefor A noise blanker (40, 106) monitors and removes noise from a sampled signal by adaptive filtering (98, 150) the sampled signal to generate trained adaptive filter prediction coefficients. The sampled signal is provided as an output signal when the noise... | 08/21/2007 |
| 7190733 | Memoryless spectrum correction algorithm for non-ideal I/Q demodulators An algorithm for correcting the output of an analog I/Q demodulator without the need for calibration or storing state information. The output of the analog I/Q demodulator is digitized, and the discrete-time samples are divided into segments. A digital frequency tra... | 03/13/2007 |
| 6933777 | AM detecting apparatus with overmodulation detecting function An AM detecting apparatus includes a voltage comparator And an AND circuit. The voltage comparator compares a detection signal a low-pass filter outputs with a no-signal potential. The AND circuit outputs, when the amplitude of an AM signal is higher than the refere... | 08/23/2005 |
| 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 |
| 6921505 | Hole filling using an etched hole-fill stand-off An assembly is disclosed that includes an etched hole-fill standoff; a tooling plate contacting the etched hole-fill stand-off, the stand-off and tooling plate being aligned to each other; a device having holes to be filled removably contacting the stand-off, the st... | 07/26/2005 |
| 6907088 | Contactless IC card for preventing incorrect data recovery in demodulation of an amplitude-modulated carrier wave In a contactless IC card that performs envelope detection on an ASK-modulated carrier wave and demodulates the carrier wave to recover data piggybacked thereon, demodulation is suspended during periods where there is no possibility of a change of a data value (from ... | 06/14/2005 |
| 6897719 | Demodulation circuit and demodulation method Two capacitors are provided for demodulating an amplitude-modulated signal and can be supplied with a signal that is rectified by a diode and that is at a voltage. The half-cycles of this signal are used for alternately charging the first or second capacitor using a... | 05/24/2005 |
| 6828853 | Wide dynamic range demodulator for smart cards or contactless tickets A demodulator for an amplitude modulated alternating signal includes a peak detection circuit for extracting the reference modulating signal from the amplitude modulated alternating signal, and a first translation circuit for offsetting the level of the reference mo... | 12/07/2004 |
| 6577182 | Device for demodulating an amplitude-modulated signal A device for demodulating a modulated signal resulting from an amplitude modulation of a sinusoidal signal of frequency fo by a signal of frequency fm according to an unknown modulation rate, comprising a transistor (10) where the ga... | 06/10/2003 |
| 6456673 | Digital radio frequency interference canceller Disclosed are radio frequency (RF) interference cancellation techniques that effectively estimate RF interference to the data signals being received using a frequency domain model, and then remove the estimated RF interference from the received data signa... | 09/24/2002 |
| 6442218 | Demodulator The present invention relates to a demodulator which receives a signal transmitted via phase modulation or multivalue QAM modulation, and decides transmitted data based on the received signal. The present invention enhances a transmission-line estimate by... | 08/27/2002 |
| 6400774 | Nonlinearity-caused distortion compensating system A radio transmitter has a quadrature modulating portion and an RF power amplifier. The RF power amplifier follows the quadrature modulating portion. A nonlinearity-caused distortion compensating system provided in the radio transmitter includes a power ca... | 06/04/2002 |
| 6169585 | Circuit arrangement for demodulating an intermediate-frequency video signal In a circuit arrangement for demodulating an intermediate-frequency video signal generated while using a Nyquist edge, having a phase-locked loop (1) including a phase detector (3), a loop filter (4) and a voltage-controlled oscillator (5), and a video de... | 01/02/2001 |
| 6075409 | Demodulation method and arrangement A method for demodulating a radio frequency signal having a frequency, by oscillating a demodulator at a frequency different from the signal frequency, and measuring a DC offset value at this different frequency, the DC offset value being associated with ... | 06/13/2000 |
| 6041082 | Digital amplitude modulation amplifier and television broadcasting machine Since output voltage e of coupler CU2 is displaced in phase by -135 degrees from input signals c and d (by -270 degrees from signals a and b), a carrier which makes signal f is phase shifted by -270 degrees by phase shifter $c;1 so that signal f may ha... | 03/21/2000 |
| 6031419 | Demodulator for contactless chip card A contactless chip card, receiving binary data transmitted by radio frequency, includes a demodulator for the binary data. The demodulator includes a circuit for the detection of the transmitted signals, a rectifier circuit, a bandpass filter, two compara... | 02/29/2000 |
| 6014412 | Digital radio frequency interference canceller Disclosed are radio frequency (RF) interference cancellation techniques that effectively estimate RF interference to the data signals being received using a frequency domain model, and then remove the estimated RF interference from the received data signa... | 01/11/2000 |
| 5742200 | Environmentally rugged optical sensor with improved noise cancellation A noise cancellation system which balances the photocurrents derived by a measurement signal and a reference signal of a sensor. The invention has application in any measurement device which detects a small signal in combination with high noise content an... | 04/21/1998 |
| 5729575 | Transmitter and receiver system and method utilizing a pilot carrier notch data encoded signal A digital transmission system for a selective call message communication network such as a paging network utilizes a quadrature amplitude modulation (QAM) transmitter (40) and receiver (42). The QAM transmitter (40) receives as a modulating input thereto,... | 03/17/1998 |
| 5697085 | Radio transceiver comprising an arrangement for compensating for a DC component A radio transceiver including a counter for outputting a DC compensation signal, an amplifier for receiving a input signal having a DC component and for receiving the DC compensation signal and forming a signal difference between the input signal and the ... | 12/09/1997 |
| 5659583 | Tone canceller for QAM demodulator Techniques in a QAM digital communication system for canceling one or more interference tones in an incoming signal to produce an output signal by generating an estimate of the interference tone during the current processing interval, subtracting the esti... | 08/19/1997 |
| 5604929 | System for correcting quadrature gain and phase errors in a direct conversion single sideband receiver independent of the character of the modulated signal A system connecting and controlling gain and phase errors in a direct conversion receiver having a pair of signal channels carrying I and Q baseband signal components in a quadrature relationship. The system operates by treating all phase and gain errors ... | 02/18/1997 |
| 5539356 | DC coupled amplifier fed by an RF detector A DC coupled amplifier fed by an RF detector is taught which has greater dynamic range capabilities than techniques in the prior art. An illustrative embodiment of the present invention advantageously comprises a low-off set voltage, low-offset current di... | 07/23/1996 |
| 5461340 | Amplitude demodulator for radio receivers to compensate for field strength influence In an amplitude demodulator for radio receivers, an intermediate frequency signal is converted into a digital intermediate frequency signal. The digital intermediate frequency signal is mixed into the baseband and amplitude demodulated. Either the interme... | 10/24/1995 |
| 5461305 | Preprocessing circuit for measuring signal envelope flatness degree in a reproducer A signal envelope measurement preprocessing circuit including: input signal adjuster for interdicting a DC component contained in a signal input for measurement of the degree of flatness of an envelope or for passing only frequencies above a predetermined... | 10/24/1995 |
| 5438591 | Quadrature amplitude modulation type digital radio communication device and method for preventing abnormal synchronization in demodulation system This invention relates to an abnormal synchronization preventing device used in a multiple value quadrature modulation type radio device and the abnormal synchronization preventing device includes a monitoring circuit for monitoring the carrier pull-out b... | 08/01/1995 |
| 5249200 | Device and method for combining precoding with symbol-rate spectral shaping The device and method provide precoding and symbol-rate transmitter spectral shaping of signals representative of digital information. The invention improves reliability of reception in the presence of non-Gaussian channel noise. The present invention als... | 09/28/1993 |
| 5144231 | Eddy current detector for detecting an object with offset compensation An RF oscillator induces eddy currents to be measured in an object. An eddy current probe senses alterations, such as teeth on a disc, for example, in the object which are represented as eddy current signals sensed by an eddy current probe. The present in... | 09/01/1992 |
| 5015963 | Synchronous demodulator A synchronous demodulator includes a switch which is operated in synchronism with an incoming periodic signal and both divides and applies that signal to two signal channels. The two channels each include a network for computing and holding, for a predete... | 05/14/1991 |
| 4985685 | Detector circuit including current attenuating circuit and capacitor A detector circuit comprises demodulating means for demodulating an input signal in accordance with a carrier wave applied to the demodulating means, current attenuating means coupled with the demodulating means and for attenuating a signal from the demod... | 01/15/1991 |
| 4975654 | Data signal discrimination method and apparatus A method and apparatus for discriminating the data signal of a transmitter means. Binary encoded data is transmitted between a transmitter means and a receiver means in an amplitude modulated signal varying about a threshold level. A means and method are ... | 12/04/1990 |
| 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 |
