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| Number | Title | Issue Date |
| 7856105 | Apparatus and method for processing of amplifier linearization signals A feed-forward amplifier includes a main amplifier having input signals and amplified output signals and an error amplifier for amplifying distortion signals to be added to the amplified output signals of the main amplifier to produce an amplifier output. A pilot to... | 12/21/2010 |
| 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 |
| 7295631 | Stereo demultiplexer A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the modulated difference signal for a noise reduction. The proposed ster... | 11/13/2007 |
| 7295628 | Stereo multiplex encoder (MPX) for FM transmission A stereo multiplex encoder (MPX) for FM transmission with a digital signal processor utilizes residual sideband modulation in stereo transmission instead of the conventional double sideband modulation. The adjustment of the sampling frequency to the modulation frequ... | 11/13/2007 |
| 7253637 | Arc fault circuit interrupter system In order to determine whether arcing is present in an electrical circuit, a sensor signal corresponding to current in said electrical circuit is processed. The sensor signal is filtered to determine the presence of noise in a predetermined frequency range and produc... | 08/07/2007 |
| 7215705 | Reducing phase noise in phase-encoded communications signals A receiver may reduce phase noise in phase-encoded communications signals using symmetrical averaging to estimate phase shift correction. In one embodiment, a receiver, such as a quadrature amplitude modulation receiver may include a decision feedback equalizer and ... | 05/08/2007 |
| 7209528 | Over-sampling A/D converter with adjacent channel power detection Disclosed is a sampling circuit for a receiver in a wireless communication device that eliminates the need for separate discrete filtering components that can be expensive and bulky. The system utilizes techniques for ensuring that system components do not become sa... | 04/24/2007 |
| 7205807 | Cascode signal driver with low harmonic content A method and apparatus for minimizing harmonic content in a digital signal driver circuit are disclosed. A digital input signal applied to an input node generates a corresponding digital output in a circuit with two or more MOS devices in cascode connection with eac... | 04/17/2007 |
| 7151656 | Arc fault circuit interrupter system A system for determining whether arcing is present in an electrical circuit in response to a sensor signal corresponding to current in the circuit includes a circuit for analyzing the sensor signal to determine the presence of broadband noise in a predetermined rang... | 12/19/2006 |
| 7149312 | Method and device to retrieve RDS information To retrieve RDS information by filtering and transforming an incoming multiplex signal (m(t)) into a RDS baseband signal, an amplitude modulated RDS signal (ma(t), mc(t)) is derived on basis of an intermediate signal (ma(t)) obtained... | 12/12/2006 |
| 7142818 | Systems and methods for reducing radio receiver interference from an on-board avionics transmitter Systems and methods for reducing interference in an enhanced radio receiver from a transmitter when both are located in the same aircraft are provided. The enhanced radio receiver detects and attenuates a signal from the transmitter, without attenuation or interfere... | 11/28/2006 |
| 7136334 | Appliance for recording or playing back information having means for signal generation from a wobble signal The invention proposes an appliance for recording or playing back information having means for signal generation from a wobble signal which is scanned from the undulating track on a recording medium, such as a DVD+RW. According to the invention, a signal scanned fro... | 11/14/2006 |
| 7136265 | Load recognition and series arc detection using bandpass filter signatures A method and system for determining whether arcing is present in an electrical circuit includes sensing a change in an alternating current in the circuit and developing a corresponding input signal, analyzing the input signal to determine the presence of broadband n... | 11/14/2006 |
| 7133478 | Device and method for detecting and suppressing noise A device for detecting and suppressing noise includes a noise detection device that receives and processes an input signal to determine if the input signal contains noise and provides a detected noise signal indicative of whether or not noise is detected in the inpu... | 11/07/2006 |
| 7132874 | Linearizing apparatus and method An apparatus and method are disclosed which provide a substantially linear relationship between an input signal, such as an input voltage or current, and a predetermined parameter, such as a frequency response or capacitance of a parallel plate capacitor or varactor... | 11/07/2006 |
| 7133527 | Stereodecoder An arrangement for decoding a stereo multiplex signal, comprising a baseband sum signal (L+R), a difference signal (L−R) which is amplitude-modulated on a suppressed sub-carrier and a pilot signal having a frequency located between the frequency bands of said sum ... | 11/07/2006 |
| 7102414 | Muting circuit for audio amplifier A muting circuit for an audio amplifier comprises differential pairs of MOS transistors in a differential amplifier and two sets of MOS transistor switch to control the differential pairs respectively. The differential pairs are connected with a current mirror circu... | 09/05/2006 |
| 7103186 | Stereo/two-tone demodulator In a stereo/two-tone demodulator for demodulating an intermnediate-frequency signal having stereo or two-tone sound signals modulated on a first and a second sound carrier, the second sound carrier having a lower amplitude than the first sound carrier, ceramic filte... | 09/05/2006 |
| 7092682 | Electronic circuit, modulation method, information processing device, and information processing method A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification section, a signal wave corresponding to a second pulse signal such that th... | 08/15/2006 |
| 7072925 | Generator structures and methods that provide low-harmonic curvilinear waveforms Simple, inexpensive waveform generators and methods are provided that generate curvilinear waveforms which comprise a fundamental sinusoid and harmonics that are either absent or are significantly reduced from the fundamental. In an exemplary method, a generator con... | 07/04/2006 |
| 7068480 | Arc detection using load recognition, harmonic content and broadband noise A method of determining whether arcing is present in an electrical circuit includes sensing a change in current in the circuit and developing a corresponding input signal, analyzing the input signal to determine the presence of broadband noise in a predetermined ran... | 06/27/2006 |
| 7046811 | Stereo demultiplexer For the noise reduction of an audio signal generated by stereo-demultiplexing of a frequency-modulated stereo multiplex signal (SFM(t)) a filtering within the signal path to generate the stereo difference signal (ud(t)) is performed that determ... | 05/16/2006 |
| 7042959 | DSP-based variable aperture code generation technique Variable Aperture Coded (VAC) signals for VAC modulation are advantageously generated by a digital signal processor (12) that yields a VAC signal having a single narrow peak in the positive frequency region. A Discrete-Time Hilbert transformer (12) iso... | 05/09/2006 |
| 7035750 | On-chip test mechanism for transceiver power amplifier and oscillator frequency An on-chip test mechanism for transceiver power amplifier and oscillator frequency for use with the transmitter portion of an integrated RF transceiver. The RF output from the power amplifier in the transmitter is input to a built-in dedicated analog comparator havi... | 04/25/2006 |
| 7035422 | Wearable speaker garments The personal wearable speaker system includes a garment having a plurality of substantially hollow tubular ducts formed from a substantially flexible material designed to promote superior sound wave flow and anti-collapse (pinch) functionality, and a plurality of pa... | 04/25/2006 |
| 7010131 | Quasi-differential power amplifier and method A quasi-differential power amplifier and method are disclosed that enhance drive capability and dynamic range by driving a right, left and common terminals with a right channel output signal, a left channel output signal, and a common mode output signal that are eac... | 03/07/2006 |
| 6978026 | Circuit arrangement for gaining a stereo subcarrier and an RDS carrier According to the invention, a circuit arrangement for gaining a 38 kHz stereo subcarrier and a 57 kHz RDS carrier for decoding a stereo signal comprised in a demodulated FM signal and/or an RDS signal comprised in a demodulated FM signal, having a simple structure w... | 12/20/2005 |
| 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 |
| 6927802 | TV receiver with individually programmable SAPchannel A video signal processor is used to receive programs in the form of a composite video signal which incorporates a video broadcast channel, a main audio channel and an additional audio channel. The main audio channel may carry a standard audio track for the program w... | 08/09/2005 |
| 6847395 | Digital television signal test equipment The invention, in part, provides an integrated digital television (DTV) diagnostic instrument comprising: at least one of a video display device (VDD) and an audio display device (AudDD); DTV circuitry (AV) to receive a DTV signal, to reconstruct at least one of a v... | 01/25/2005 |
| 6813359 | Apparatus and method for minimizing multipath interference A method and apparatus for minimizing multipath interference for commercial FM signals which use SCA secondary signals in QAM format that includes tracking the time series of phase measurements of a received stereo pilot signal for determining the proper phase refer... | 11/02/2004 |
| 6777718 | Semiconductor optical device A semiconductor optical device includes a substrate, an optical waveguide layer on the substrate and having well and barrier layers. The semiconductor optical device also includes an optical absorbing layer on the substrate and adjacent to the optical waveguide laye... | 08/17/2004 |
| 6618486 | Controller for FM 412 multiplex power regulation A feedback controller, embedded in an FM audio processor, that controls the "integrated multiplex power" to the requirements of ITU-R 412 (2.51) is disclosed. This regulation specifies the maximum power, which is the same as the power produced by a sinewa... | 09/09/2003 |
| 6492913 | Method and circuit for decoding an analog audio signal using the BTSC standard An integrated circuit for decoding an analog audio signal includes a tuner that receives the analog audio signal and provides a sound intercarrier frequency signal. A digital demodulator receives and digitizes the sound intercarrier frequency signal to pr... | 12/10/2002 |
| 6178317 | System and method for mitigating intermittent interruptions in an audio radio broadcast system A system (100) is provided wherein a primary radio signal and a redundant radio signal are transmitted from a transmitter subsystem (120) and received by a receiver subsystem (140). The output (112) of an audio source (110) is coupled to a modulator (160)... | 01/23/2001 |
| 6118879 | BTSC encoder The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and thereby generating a digital left filtered signal; a right ... | 09/12/2000 |
| 5848167 | Distributed pre-emphasis equalizer A distributed pre-emphasis equalizer comprises a partial pre-emphasizer and a (50) microsecond pre-emphasizer. The partial pre-emphasizer receives an input signal and produces a partially pre-emphasized output signal. The (50) microsecond pre-emphasizer r... | 12/08/1998 |
| 5796842 | BTSC encoder The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and thereby generating a digital left filtered signal; a right ... | 08/18/1998 |
| 5774555 | Switched capacitor bandpass filter for detecting pilot signal An apparatus for detecting a pilot signal. A phase detector detects a phase difference between a filtered amplitude-modulated pilot signal and a frequency divided signal, and a low pass filter low-pass-filters the phase difference. A voltage-controlled os... | 06/30/1998 |
| 5696830 | Circuit arrangement for deriving a quality signal dependent on the quality of a received multiplex signal The method for obtaining the quality signal includes multiplying a digital multiplex signal (MPX) by respective reference carrier signals mutually phase shifted by 90° to each other, but otherwise equal, to form a pair of mixed signals (Imr1,Imr2); multi... | 12/09/1997 |
