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7587188 |
Radio wave reception device, radio wave clock, and repeater
A received low-frequency standard radio wave, which is an amplitude modulation signal, is converted to an intermediate frequency signal Sa, and is output to a detection circuit and an AGC circuit....
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7515653 |
Digital broadcasting receiver, driving method thereof, and self-diagnosis method thereof
A digital broadcasting receiver, a driving method, and a self-diagnosis method thereof, are provided. The digital broadcasting receiver includes: a digital demodulator for demodulating a digital...
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7508860 |
Pulse signal generator for ultra-wideband radio transception and radio transceiver having the same
Provided are a pulse signal generator for UWB radio transception and a radio transceiver having the same. The pulse signal generator includes: an envelope generator generating a plurality of...
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7447493 |
Tuner suitable for integration and method for tuning a radio frequency signal
A tuner ( 200 ) includes a direct digital frequency synthesizer ( 206 ) and a mixer ( 220 ). The direct digital frequency synthesizer ( 206 ) has an output terminal for providing a digital local...
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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...
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7424069 |
Reference timing signal apparatus and method
A reference timing signal apparatus with a phase-locked loop has a computer algorithm which adaptively models the multiple frequencies of an oscillator following a training period. The oscillation...
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7421043 |
Method and/or apparatus for stabilizing the frequency of digitally synthesized waveforms
An apparatus comprising a first circuit, a second circuit, a third circuit and a fourth circuit. The first circuit may be configured to generate a demodulated signal in response to (i) a modulated...
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7336732 |
Carrier frequency detection for signal acquisition
A carrier frequency in a filtered received M-ary phase-shift keyed (MPSK) modulated signal having in-phase and quadrature components is detected by processing the filtered received signal to remove...
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7310112 |
Information recording device and communication method thereof, electronic camera, and communication system
An information recording device in which low-noise and clear image or audio information can be recorded by stopping the generation of a carrier in an oscillation section of wireless communication...
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7145963 |
Method and apparatus for multiple phase splitting for dual band IQ subharmonic mixer drive chains
A method and apparatus are provided for generating first and second modulation signals from a local oscillator signal for quadrature subharmonic modulation of a quadrature amplitude modulated...
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7062240 |
Automatic frequency control processing in multi-channel receivers
A multiple channel receiver ( 200 ) includes a communications receiver synthesizer ( 204 ) and at least one numerically controlled oscillator (NCO) ( 406 ) that produce local oscillator signals...
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6658066 |
Method and apparatus for multiple phase splitting for dual band IQ subharmonic mixer
A method and apparatus are provided for generating first and second modulation signals from a local oscillator signal for quadrature subharmonic modulation of a quadrature amplitude modulated...
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6359944 |
Tuning system for achieving quick acquisition times for a digital satellite receiver
The RF signals received from the LNB and the corresponding IF signal produced by the tuner may be offset in frequency due to reasons other than a frequency drift of the oscillator of the LNB, such...
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6310924 |
Digital demodulator
A digital demodulator which is capable of simplifying an application specific integrated circuit (ASIC) of a demodulator using a combined sampling technique. The digital demodulator includes a...
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6282232 |
Methods and apparatus for burst-mode CDMA DSSS communications receiving systems
A method and apparatus for receiving and processing burst-mode code-division multiple access (CDMA) direct-sequence spread-spectrum (DSSS) signals is provided. In this apparatus and method, a...
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6018551 |
Method and apparatus for reproducing carrier
A complex multiplier 5 complex-multiplies base band signals x and y obtained from a receive signal by local oscillation signals c and s, to output complex detection signals p and q. A phase...
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5844943 |
Method and converter for converting rectangular signals to phase signals
A rectangular to phase converter (201) includes a first converter circuit (201B) which limits signals to a predetermined level. A phase selector (259) selects a relative phase from the limited...
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5719747 |
Interface unit for communication device with parts positioned on a printed-wiring board for achieving desirable operating characteristics
An interface unit having a digital hierarchy interface function for a communication device has parts disposed on a printed-wiring board in a Layout to maintain desired interface unit...
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5604724 |
Maximum likelihood estimation using reference and spontaneous output peaks of partial response equalizer
In a signal processor for processing a multilevel signal, a partial response equalizer is provided having a first predetermined number of reference amplitudes. The equalizer receives the multilevel...
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5579338 |
Spread spectrum receiver using partial correlations
A complex baseband signal as long as one period of PN signal is divided into three sequences. The three partial signals are input to three correlators which then calculate the correlations between...
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5388125 |
Frequency converter circuit with improved intermediate frequency stability
A frequency converter circuit which includes a first frequency conversion unit which mixes a received signal and a first local oscillation signal to produce a first intermediate frequency signal...
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5321725 |
Method and apparatus for communicating digital information such as compressed video using treillis coded QAM
A method and apparatus for communicating high definition television signals is provided. Video signals are divided into blocks of PCM data. The PCM data is processed using motion estimation and...
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4807254 |
Carrier wave recovery system
A carrier wave recovery system for a slotted ALOHA system is disclosed. In a time slot where a burst is not inputted, the frequency of oscillator means is locked to a mean value of carrier wave...
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4455663 |
Full duplex modems and synchronizing methods and apparatus therefor
Full duplex modems and synchronizing methods and apparatus therefor which allow the relatively low cost realization of full duplex modems compatible with prior art data sets such as the Bell System...
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4440987 |
Computer and peripheral interface circuit
An interface circuit is disclosed for connecting a digital computer to a modem or other peripheral circuit through either a standard digital signal (RS232) "port" or an audio-frequency "port"...
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4392233 |
Method of filtering electromagnetic waves and dual channel audio code filter therefor
An original electromagnetic continuous wave which is broken up into discrete lengths to form intelligence such as Morse Code, is filtered to eliminate noise, static and other electrical...
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4013965 |
Circuit for preventing errors in decoding information from distorted pulses
A converter for converting radio teleprinter audio frequency signals from a radio receiver into teleprinter signals which are bipolar pulses for operating an output device. The converter includes a...
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3660844 |
RADAR DETECTOR AND IDENTIFIER
A radar detector and identifier device described with reference to an illustrative embodiment wherein the device is carried and used by persons, such as military personnel, to warn them when they...
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3550008 |
RADIO FREQUENCY CARRIER WAVE SIGNAL DETECTOR
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3500401 |
RADAR DETECTION DEVICE
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3137817 |
V. l. f. radio receiver
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3018369 |
Transistorized direction finder receiver having a local audio signal modulated on the mixer
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2888554 |
Diversity reception
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2794120 |
Automatic frequency control
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