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Class 381/15 - AM or both AM and angle final modulation


Subclass of Class 381 - Electrical audio signal processing systems and devices
Definition: Subject matter having a carrier wave which is amplitude
No. of patents: 176
Last issue date: 12/29/2009


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NumberTitleIssue Date
7639821System and method for improved detection of AM signals
A software defined radio detects an amplitude modulated (AM) signal contained within a received signal. This detection involves first receiving a radio frequency (RF) signal that contains the AM signal modulated about a carrier frequency (fc). The RF sign...
12/29/2009
7366264Method and system for reducing noise in a multi-carrier signal
A receiver 100 for receiving a multi-carrier signal comprises detection means for detecting 801 the presence of impulse interference within the signal and identifying one or more samples of the signal affected by the impulse interference, means for sel...
04/29/2008
7340272Mobile communication terminal having a three-dimensional surround sound effect and its control method
A mobile communication terminal with three-dimensional surround-sound effect system has a data processing section for coding and modulating a transmitting signal or demodulating and decoding a receiving signal, and an audio processing section for reproducing an audi...
03/04/2008
7330141Compensation circuit and compensation method to compensate nonlinear distortions of an A/D converter
The invention relates to a compensation circuit (1–6) to compensate nonlinear distortions of an A/D converter comprising a signal input and a compensation system. In order to avoid the high costs related to the complex analog design of the A/D converter and...
02/12/2008
7324615Time signal receiver and decoder
A time signal receiver and decoder receives, detects and stores time information from time signals, e.g., WWV, WWVH, WWVB (USA), JJY (Japan), MSF (UK) and the like. The time information may be used for a self setting clock, and the clock may be used as a reference i...
01/29/2008
7321735Optical 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
7302011Quadrature frequency doubling system
The frequency doubler of the present invention operates to provide an in-phase signal and a quadrature signal, each having a frequency equal to twice the frequency of a reference signal. The in-phase and quadrature signals are based on signals that are 0 degrees, 45...
11/27/2007
7295826Integrated 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
7295631Stereo 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
7292835Wireless 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
7239710Stereo radio receiver with noise suppression
For the purpose of largely suppressing the noise pulses caused in a stereo radio receiver in the reception signal, particularly by the ignition system of a motor vehicle, a digital field strength signal representing the analog field strength signal is produced for e...
07/03/2007
7209528Over-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
7208351Electronic device and method of manufacture the same
An electronic device, in which a flat plate semiconductor and dumets connected to surface electrodes on the front and back surfaces of the semiconductor and to lead wires are encapsulated in a glass tube. ...
04/24/2007
7202359Azaoxa heterocyclic compound and method of preparing the same
Disclosed is an azaoxa heterocyclic compound represented by the following formula (I): (wherein, each symbol is defined the same as in the specification) and a method for preparing the same. This compound of the ...
04/10/2007
7177364System, decoder and method for transmitting, receiving and decoding high-speed digital data signals with reduced electromagnetic emissions
A digital communications system includes a transmitter and a receiver. The transmitter is capable of quadrature amplitude modulation (QAM) encoding each bit of at least one n-bit digital signal into at least one QAM signal and thereafter transmitting the QAM signals...
02/13/2007
7171180AM receiver circuit performing sound quality compensation of AM detection output signal
An AM receiver circuit comprises an IF intensity detection section which detects intensity of a carrier wave of an IF signal and outputs an IF signal carrier wave intensity signal in accordance with the detected intensity. The IF intensity detection section extracts...
01/30/2007
7164774Amplifier with limiter
A sound volume set-point value set by the variable resistor 1 is converted into a sound volume set-point value signal by a sound volume set-point value detecting section. A control signal generating section rectifies an input signal and adds it to a sound vol...
01/16/2007
7133478Device 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
7127008Coherent AM demodulator using a weighted LSB/USB sum for interference mitigation
A method of processing an AM radio signal comprises the step of receiving an AM radio signal including an upper sideband portion and a lower sideband portion, demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideb...
10/24/2006
7110435Spread spectrum applications of universal frequency translation
Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified up-conversion and spreading, RAKE receivers utilizing unified down-conversion an...
09/19/2006
7110444Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen...
09/19/2006
7092460Digital stereo demultiplexer
In a stereo demultiplexer receiving a frequency demodulated stereo-multiplex signal (m(t)) which comprises at least a stereo-difference signal (md(t)), a stereo-sum signal (ms(t)) and a pilot carrier, a PLL-circuit (4) to recover the pil...
08/15/2006
7082171Phase shifting applications of universal frequency translation
A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called an aliasing signal). By controlling the relative sampling time, the UFT modul...
07/25/2006
7072390Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments
Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen...
07/04/2006
7058119Parallel architecture digital filter and spread spectrum signal receiver using such a filter
This invention relates to parallel architecture digital filter and signal receiver with spectrum spreading using such a filter, the filter may have p shift registers (Rp, Ri) with means for calculating a weighted sum of stored samples in the re...
06/06/2006
7054296Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation
Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ...
05/30/2006
7046811Stereo 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
7043026Method for removing AM neighboring interference and a circuit for the same
An AM neighboring interference removing method and circuit is provided which can select only a desired AM modulation wave even if an interference AM modulation wave is partially superposed upon the desired AM modulation wave. An AM modulation wave desired to be rece...
05/09/2006
7039372Method and system for frequency up-conversion with modulation embodiments
A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ...
05/02/2006
7027786Carrier and clock recovery using universal frequency translation
Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ...
04/11/2006
7010286Apparatus, system, and method for down-converting and up-converting electromagnetic signals
Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive o...
03/07/2006
7006638Electronic stethoscope
An electronic stethoscope having a vibration transducer, an amplifier, a headphone arrangement, and at least one digital filter for establishing at least one impulse transfer function corresponding to at least one acoustic stethoscope type. Thus, the signals heard w...
02/28/2006
7006883Production system for composite product and production method for manufacturing of same
To provide a product development and manufacturing system to be used in the increasingly competitive electronic equipment market, which enables the process from product planning to design, manufacturing, and sales of a product to be performed efficiently while incor...
02/28/2006
7006637Integrated self diagnostics for loudspeaker systems
A self-diagnostic circuit for speaker systems that allows a speaker system to generate its own test signals, e.g., tones, appropriate for the transducer(s) in the speaker system. The test signals are routed to the analog circuits in the speaker system. The test sign...
02/28/2006
7006805Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service
A receiver having multi-mode and multi-band functionality and capabilities is described herein. The receiver is capable of selectively operating over a plurality of bands and channels. The receiver operates in a plurality of modes, including but not limited to a sin...
02/28/2006
7003271Direct conversion receiver having a gain-setting dependent filter parameter
In a direct conversion radio frequency receiver, an automatic gain control is implemented that allows changing the operation mode of a filter unit in the baseband section of the receiver such that in a first operation mode filter capacities are selected to provide d...
02/21/2006
6970020Half-rate linear quardrature phase detector for clock recovery
A half-rate linear phase detector is particularly well-suited to clock data recovery in a serial data interface. The phase detector uses a quadrature clock to process different portions of the incoming data with different phases of the clock. The resulting component...
11/29/2005
6965653Circuit and method for processing an automatic frequency control signal
An integrated demodulator tuning circuit (10, 60) receives differential currents at input terminals (12, 46) and provides an AFC signal at an output terminal (48). The AFC current characteristic has a dead band (72) in the output current ...
11/15/2005
6930401Electronic device and method of manufacture the same
An electronic device, in which a flat plate semiconductor and dumets connected to surface electrodes on the front and back surfaces of the semiconductor and to lead wires are encapsulated in a glass tube. ...
08/16/2005
6925114Weak signal processing based on impulse noise blanking
An improved noise reduction system (20) is provided for a radio frequency audio processor having one or more weak signal processing components for generating one or more corresponding control values (36a, 36b) for controlling chara...
08/02/2005
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