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| Number | Title | Issue Date |
| 7650125 | System and method for SAP FM demodulation Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator... | 01/19/2010 |
| 7430247 | Carrier frequency detection for N-ary phase modulated signal Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nth power, transformin... | 09/30/2008 |
| 7406302 | Digital FM stereo receiver architecture Systems and techniques for digital processing of FM stereo signals are described. A carrier signal such as a 38 kHz carrier may be recovered and used to process a difference signal such as a left minus right signal. The left minus right signal and a left plus right ... | 07/29/2008 |
| 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 |
| 7373123 | Multiple tuners in a single radio receiver A radio receiver having multiple AM/FM tuners. A first tuner and a second tuner may be connected with an antenna for generating a first and second composite audio output signal. A dual input digital signal processor may be connected with the first tuner and the seco... | 05/13/2008 |
| 7366488 | Digital carrier-recovery scheme for FM stereo detection Systems and techniques for digital processing of FM signals. Digital processing may include recovering a carrier signal at a second frequency based on a reference signal at a first frequency. ... | 04/29/2008 |
| 7352831 | Digital frequency measurement system and method with automatic frequency control A digital frequency measurement system including first and second digital differentiators responsive to first and second digital quadrature signals representative of first and second quadrature modulated input signals that represent binary data having a center frequ... | 04/01/2008 |
| 7312554 | Piezoelectric devices and methods and circuits for driving same A drive circuit (18) senses a parameter of a piezoelectric actuator (14) operating in a device (10) and adjusts a drive signal of the piezoelectric actuator in accordance with the parameter. The drive circuit comprises a controller (100) ... | 12/25/2007 |
| 7302629 | Apparatus and method for coding and decoding irregular repeat accumulate codes An apparatus and method for coding an irregular Repeat Accumulate (RA) code. A repeater repeats a received information word such that the information word corresponds to weights of a first information part and a second information part of a parity check matrix in wh... | 11/27/2007 |
| 7299022 | Carrier detecting circuit and infrared communication device using same A carrier detecting circuit which generates a carrier detection level by integral action based on a reception signal and detects using the carrier detection level whether a carrier exists is disclosed and includes an integration capacitor that is charged and dischar... | 11/20/2007 |
| 7292093 | Envelope detector with DC level shifting An envelope detector that does not generate an undesirable DC offset at its DC output signal. An envelope detector according to the present teachings includes a circuit for performing a DC level shift on an AC input signal applied to the envelope detector such that ... | 11/06/2007 |
| 7272368 | System and method for reduced deviation time domain FM/PM discriminator to achieve a reduced bandwidth frequency or phase modulation communications channels The present disclosure provides a receiver for receiving a narrow frequency deviation frequency modulated or phase modulated base band signal including a mixer for mixing the received narrow frequency deviation signal to generate an intermediate frequency signal, a ... | 09/18/2007 |
| 7266348 | Tire air pressure detection system A tire air pressure detection system, able to prevent a strong electric field or strong radio interference from affecting transmitters and causing mistaken data relating to tire air pressure to be sent out and a driver from being mistakenly warned, having transmitte... | 09/04/2007 |
| 7231197 | Angle rate interferometer and passive ranger A receiver includes a processor and an RF bridge. The RF bridge is coupled to the processor to receive a reference signal from the processor. The RF bridge includes first and second frequency converters coupled to respective first and second antennas. The RF bridge ... | 06/12/2007 |
| 7212587 | Apparatus for reducing DC offset in a receiver Apparatus for reducing DC offset in a signal path of a conversion system comprising a front end circuit for providing an input signal having an a DC offset; an amplifier system coupled to the front end circuit to receive and amplify the input signal; a multi-bit sig... | 05/01/2007 |
| 7178081 | Simplified message-passing decoder for low-density parity-check codes Disclosed is an implementation method for simplifying a complicated message-passing function in a decoder for decoding block codes encoded with low-density parity-check (LDPC) codes and only using a summator and a shifter to simplify the hardware structure of the de... | 02/13/2007 |
| 7116963 | Simplified high frequency tuner and tuning method A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the chan... | 10/03/2006 |
| 7113750 | Apparatus and method for input channel isolation within an electronic test instrument An electrical isolation device wherein a signal to be electrically isolated is mixed with a carrier signal by a multiplier to produce a modulated carrier signal which is passed through an isolation barrier and demodulated and filtered to extract thereby the initial ... | 09/26/2006 |
| 7076219 | Receiver for weak radio wave An aspect of the present invention provides a receiving circuit that includes a mixer configured to receive a signal and a local signal to mix the signals, the mixer configured to convert the signals into an intermediate frequency signal, an IF filter configured to ... | 07/11/2006 |
| 7065328 | Superregenerative AM demodulator An AM receiver incorporates an antenna, a transistor, a current source, and a power supply. The antenna is connected to a gate electrode of the transistor and through a link to a signal earth. In operation, the antenna receives radiation and generates a correspondin... | 06/20/2006 |
| 7062231 | Direct modulation transmitter utilizing signals squaring A apparatus to provide a direct modulation transmitter having high dynamic range and low distortion using signal processing at a first frequency level for a signal to be transmitted and increasing frequency to transmission frequency in a manner to avoid distortion a... | 06/13/2006 |
| 7023937 | Receiver window design for multicarrier communication systems A receiver window design algorithm (210) is developed which minimizes the noise power of the demodulated multicarrier signal. The windows are effective on a variety of different channels and noise sources. Receiver windowing is a computationally efficient technique ... | 04/04/2006 |
| 7013116 | MIMO systems having a channel decoder matched to a MIMO detector A method and apparatus for reducing the number of erred bits in the decoded signal by using a channel decoder whose transfer characteristic is matched to the transfer characteristic of the MIMO detector. This means that the curve of the transfer characteristic of th... | 03/14/2006 |
| 7006800 | Signal-to-noise ratio (SNR) estimator in wireless fading channels A signal-to-noise estimator is provided for estimating the signal-to-noise ratio in wireless fading channels. The estimator can be applied to likelihood ratio estimation of turbo decoders in third generation wide-band code division multiple access (WCDMA) systems. T... | 02/28/2006 |
| 7006824 | Frame/packet-based calibration for wireless transceivers A packet-based wireless transceiver that transmits and receives data packets includes a transceiver component having an adjustable performance parameter. A calibration circuit adjusts the performance parameter of the transceiver component at times synchronized with ... | 02/28/2006 |
| 7006806 | System and method for SAP FM demodulation Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator... | 02/28/2006 |
| 7003438 | Apparatus for correcting for the effects of laser noise Adaptive noise reduction techniques used in devices that pass light from a laser through a quantum medium such as a rubidium vapor cell. A CPT frequency standard that employs the techniques has a first channel in which the laser light passes through the quantum medi... | 02/21/2006 |
| 6993315 | Super-regenerative microwave detector A resonant tunneling diode or diode array oscillator (10) including a resonant diode (11) is coupled to a millimeter-wave source (14) and a quench generator (16) for periodically quenching the oscillations so that the average oscillation ... | 01/31/2006 |
| 6950640 | FM detector circuit An FM detector circuit includes a bridge circuit having four sections with a discriminator connected as one of the four sections. An FM intermediate frequency is applied across one pair of diagonally opposed nodes of the bridge circuit and an output is picked up acr... | 09/27/2005 |
| 6937871 | Anti-demodulator circuit, filtering device and demodulator circuit The invention relates to an anti-demodulator circuit which is fundamentally built up in the same way as a demodulator circuit but, instead of a bandpass filter as generally used in a demodulator, comprises a notch filter which receives an input signal comprising a u... | 08/30/2005 |
| 6914946 | Digitally-implemented demodulator A digitally implemented demodulator. A frequency-modulated signal is applied to a limiting amplifier such that the signal amplitude is fixed at a constant level. The signal is undersampled and quadrature demodulated. The demodulator generates the cross-product of th... | 07/05/2005 |
| 6915141 | Secondary automatic gain control loops for direct conversion CDMA receivers A communications device includes a frequency conversion circuit and a control circuit. An antenna receives a radio signal at a first frequency and converts it into a radio frequency (RF) signal of the first frequency. The frequency conversion circuit is associated w... | 07/05/2005 |
| 6903603 | Phase detection circuit and receiver A quadrant deciding section decides the quadrant to which a received signal belongs based on a baseband signal. A rotation projector rotates the received signal and projects the rotated signal to a straight line that intersects orthogonally at the origin with a stra... | 06/07/2005 |
| 6859238 | Scaling adjustment to enhance stereo separation A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient... | 02/22/2005 |
| 6809584 | Signal transmission and receiving methods optimized for integrated circuit implementation A demodulator for demodulating a modulated input signal transmitted at a carrier frequency includes a current mirror for receiving the modulated input signal and generating a first and a second current-mirror output signals of same amplitude and frequency as the mod... | 10/26/2004 |
| 6798289 | System, apparatus and method for voltage to current conversion A voltage-to-current converter having improved third order distortion is disclosed herein for use in an FM radio system, particularly an FM radio system which employs a broadband input filter rather than a narrow band input filter. By cross-coupling a main amplifier... | 09/28/2004 |
| 6792051 | In-band-on-channel broadcast system for digital data An FM broadcast transmitter transmits a broadcast signal having a carrier at a broadcast frequency and sidebands, able to be transmitted at full power, within a transmission band-width around the carrier. It includes a source of a modulated FM stereo signal having a... | 09/14/2004 |
| 6790116 | Radio communication apparatus and radio frequency correcting method To ensure frequency stability of a radio frequency in a radio communication apparatus for generating the radio frequency synchronizing with a transmission path frequency of digital data transmitted from a wire digital transmission path and so on. Concerning influenc... | 09/14/2004 |
| 6757336 | Device and method for performing a carrier recovery A method of receiving a signal and performing a carrier recovery, the method comprising the steps of: (a) receiving a signal Xk. (b) rotating Xk by a previous correction angle θk−1 to generate a rotated signal Qk, wherein the rotation is based upon a sine and cos... | 06/29/2004 |
| 6754281 | Programmable digital demodulator for OFDM modulations The invention relates to a digital demodulator whose architecture is adapted to multicarrier modulations (radio wave transmissions), but which remains suitable for use for monocarrier modulations (cable and satellite transmissions). With multicarrier modulations, th... | 06/22/2004 |
