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| Number | Title | Issue Date |
| 8170151 | FSK receiver A receiver includes a band-pass filter that limits a passband of an IF (Intermediate Frequency) signal, an FSK detector that detects the IF signal passing through the band-pass filter to generate a detection signal, and a control block that controls a modulation sen... | 05/01/2012 |
| 8155242 | Frequency shift keying (FSK) digital signal receiving apparatus A frequency shift keying digital signal receiving apparatus includes a detecting portion detecting a new signal on the basis of a signal, from which a correlated ambient noise is filtered out by an adaptive filter, a holding portion holding a first electric power fo... | 04/10/2012 |
| 8149956 | Method of automated demodulation and classification of phase-shift-keying signals using hysteretic differential zero-crossing time samples An automatic zero-crossing signal demodulation and classification device for rapidly identifying an unknown modulation in a signal identifies an unknown modulation in a signal, demodulates differential phase shift keying signals and automatically recognizes certain ... | 04/03/2012 |
| 8023591 | Method and system for a shared GM-stage between in-phase and quadrature channels Aspects of a method and system for a shared GM-stage between in-phase and quadrature channels may include processing an in-phase (I) component signal for the I channel and a quadrature (Q) component signal for the Q channel via one or more shared transconductance st... | 09/20/2011 |
| 7916813 | Receiver device A frequency converter converts a high frequency signal transmitted in a frequency shift keying scheme into an intermediate frequency signal having a predetermined frequency, to output the intermediate frequency signal therefrom. An amplitude limiter limits an amplit... | 03/29/2011 |
| 7903764 | Integrated burst FSK receiver An integrated burst FSK receiver is provided to receive and interpret an RF signal using FSK modulation. The integrated burst FSK receiver uses a programmable RF local oscillator to mix a received signal down to an IF range or baseband, where it is filtered and samp... | 03/08/2011 |
| 7881409 | Demodulator, chip and method for digitally demodulating an FSK signal A demodulator, chip and method for digitally demodulating an FSK signal utilizing a digital data transfer protocol and a digital demodulator circuit have been developed. The data-rate approaches the carrier-frequency. The one application for this technique is in the... | 02/01/2011 |
| 7860192 | FSK demodulator, FM demodulator, and related method with a build-in band-pass filter A frequency shift keying (FSK) demodulator includes a band-pass filter, an auto-calibration loop, a phase comparator, and an analog-to-digital converter. The band-pass filter is used for shifting phase of an FSK signal to generate a revised FSK signal. The auto-cali... | 12/28/2010 |
| 7751504 | Frequency modulation-frequency shift keying demodulator A frequency modulation-frequency shift keying (FM/FSK) demodulator is provided, including a modulation signal input terminal for receiving a first modulation signal; a phase shifter for receiving the first modulation signal and then shifting its phase to output a se... | 07/06/2010 |
| 7715500 | FSK signal detector for detecting FSK signal through digital processing In an FSK signal detector, an output from a limiter amplifier and an FSK signal are supplied to a comparator. The comparator has its output connected to two channels each composed of a correlator, an absolute value calculator and a digital low-pass filter in this or... | 05/11/2010 |
| 7664205 | Frequency-shift-keying demodulator and method of frequency-shift-keying A frequency-shift-keying demodulator including a phase shifter for shifting the phase of an input signal by a predetermined degree and outputting a shifted signal, a combining unit for combining the input signal and the shifted signal and for outputting a correspond... | 02/16/2010 |
| 7653152 | Frequency measurement system for low modulation index digital FM/PM communication Apparatus and methods for data demodulation in FM-FSK communication systems may include comparing the power spectral density (PSD) of the received frequency spectrum with that of the previously received samples using digital signal processing on a multi-sample messa... | 01/26/2010 |
| 7616710 | Frequency offset estimating method and receiver employing the same Provided is a method for estimating carrier wave or doppler frequency offset based on an approximated quadratic non-linear function in fine search, and a receiver employing the method. The method for estimating frequency offset includes the steps of: a) extracting m... | 11/10/2009 |
| 7508890 | Apparatus and method for FSK demodulation with integrated time and frequency tracking An FSK receiver comprising: 1) demodulation circuitry for receiving an incoming FSK signal and generating a baseband signal comprising an amplitude modulated symbol stream, of Logic 0 symbols and Logic 1 symbols having a data rate, R; 2) auto-correlation circuitry f... | 03/24/2009 |
| 7439799 | Frequency shift keying demodulator robust for frequency offset A frequency shift keying demodulator robust for frequency offset is provided. The demodulator is used to enable the signal to be received correctly when the frequency offset occurs. A microprocessor of demodulator controls a frequency mixer and a phase difference ge... | 10/21/2008 |
| 7428274 | Receiver of frequency-modulated signals with digital demodulator A receiver of a frequency-modulated signal representing a digital signal includes a down conversion unit or frequency translation unit to lower the frequency of the frequency-modulated signal and a digital demodulator to regenerate the digital signal from the lowere... | 09/23/2008 |
| 7400904 | Dual mode AM-FM receiver with I-Q decoding, such as for utility data collection Methods and apparatus demodulate and decode a plurality of AM and FM arriving signals, which permit, for example, a utility data-collecting unit to concurrently receive and decode transmitted signals of legacy transmitters as well as more recent FM based transmitter... | 07/15/2008 |
| 7397300 | FSK demodulator system and method An FSK demodulator system with tunable spectral shaping including a pair of quadri-correlators responsive to first and second quadrature signals, one of the pair deriving first and second signals representative of the frequency deviation of the quadrature signals at... | 07/08/2008 |
| 7386065 | Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system A voltage controlled oscillator (VCO), suitable for use in a frequency shift keying (FSK) system. The VCO device comprises a switching varactor unit, having a first terminal and a second terminal, wherein the switching varactor unit produces a capacitance, according... | 06/10/2008 |
| 7376207 | Apparatus for receiving and recovering frequency shift keyed symbols A receiver architecture for receiving an FSK signal having a predetermined number of modulation levels includes a selectivity filter (206) for selectively passing a wanted channel and rejecting unwanted channels. The selectivity filter has a filter bandwidth ... | 05/20/2008 |
| 7369629 | FSK signal demodulation circuit A demodulation circuit for demodulating an FSK signal comprising a long bit having a long bit period and a short bit having a short bit period comprises a bit boundary detection section for detecting a bit boundary timing of each bit, and a bit determination section... | 05/06/2008 |
| 7366478 | Partitioned radio-frequency apparatus and associated methods Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and th... | 04/29/2008 |
| 7362827 | System and method for the demodulation of IFF signals A method for the decoding of a signal in an interrogation/response type of communications system, the received signal being formed by a video signal and a signal containing the data, wherein the method comprises at least the following steps: 1) transposing the recei... | 04/22/2008 |
| 7336731 | Demodulator with phase-adjusting function A demodulator with a phase-adjusting function including a detector including a delay detector delaying an input signal in delaying stages using a first clock obtained by frequency-dividing a sampling-clock at a first-ratio to output a delayed modulated signal, the s... | 02/26/2008 |
| 7335395 | Methods of using pre-formed nanotubes to make carbon nanotube films, layers, fabrics, ribbons, elements and articles Methods of Using Preformed Nanotubes to Make Carbon Nanotube Films, Layers, Fabrics, Ribbons, Elements and Articles are disclosed. To make various articles, certain embodiments provide a substrate. Preformed nanotubes are applied to a surface of the substrate to cre... | 02/26/2008 |
| 7327797 | Orthogonal frequency division multiplexing (OFDM) receiving device for forming beam with uneven width by channel property, communication device using the same, and method thereof An OFDM receiving device for adjusting a beam formation azimuth through a plurality of antennas, a communication device using the same, and a method thereof. The OFDM communication device having a plurality of individually-aligned antennas includes a receiving signa... | 02/05/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7317958 | Apparatus and method of additive synthesis of digital audio signals using a recursive digital oscillator A method of performing additive synthesis of digital audio signals using a novel recursive digital oscillator includes the step of receiving digital audio signal frames wherein each digital audio signal frame includes a set of frequency, amplitude, and phase compone... | 01/08/2008 |
| 7317309 | Wideband signal analyzing apparatus, wideband period jitter analyzing apparatus, and wideband skew analyzing apparatus A wideband signal analyzing apparatus for analyzing an input signal includes frequency-shifting means for generating a plurality of intermediate frequency signals by shifting a frequency of the input signal as much as respectively different frequency-shifting amount... | 01/08/2008 |
| 7313196 | Method and system for baseband amplitude limiting A system for baseband amplitude limiting is provided. The system includes a CORDIC vector mode rotator device having an angle accumulator in addition to a gain device and limiter. The system also includes a second CORDIC rotator operating in rotation mode, and is co... | 12/25/2007 |
| 7310508 | Inline filter resistors A shorted resistive block formed in line with at least one trace of a plurality of a top metal layer includes a plurality of resistors with a removable shorting link coupled across the resistive block. The resistive block comprises one of a plurality of series coupl... | 12/18/2007 |
| 7304923 | Disk drive and detection method using pre-pit detection and push-pull signal generation A push pull signal is detected from a disk-shaped storage medium on which wobbling grooves are formed as recording tracks and address information is recorded by forming pre-pits on lands between adjacent grooves. The detected push-pull signal is compared with a refe... | 12/04/2007 |
| 7302022 | Automatic gain control device and method in orthogonal frequency division multiplexing system with DC offset compensation function, and recording medium storing program containing the method Disclosed is an AGC (automatic gain control) device and method of an OFDM system with a DC offset compensation function, and a recording medium storing a program including the method. The AGC device calculates an energy of input signals with DC offsets as the summat... | 11/27/2007 |
| 7302112 | Contour-emphasizing circuit An edge enhancement circuit uses bandpass filters to separate an original video signal into low-, middle- and high-frequency band edge components which will be supplied to waveform shaping circuits. Each of the waveform shaping circuits detects an amplitude peak lev... | 11/27/2007 |
| 7298788 | Wireless communication system and method A communication system including a first device transmitting a modulated signal and a second device receiving the modulated signal. The second device can include a first demodulator and a second demodulator. The first demodulator can receive the modulated signal, pr... | 11/20/2007 |
| 7298202 | FSK demodulator An FSK demodulator which outputs an enable signal in response to the detection of a data change point in a detected signal of an amplitude associated with the received frequency of an input FSK signal, outputs an average signal of the detected signal for each predet... | 11/20/2007 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7286615 | FSK signal detector A detector includes a binarizer for binarizing the amplitude of an input FSK signal; a 2n-stage shift register having 2n registers for sequentially shifting the FSK signal binarized by the binarizer in response to a clock; and an adder for calculating a sum of a tot... | 10/23/2007 |
| 7286617 | Methods and apparatus for synchronization of training sequences A receiver and a method for receiving a signal including a carrier modulated with a known training sequence is described in which an estimate a carrier frequency offset is obtained from an autocorrelation signal by autocorrelation of the part of the received signal ... | 10/23/2007 |
