子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 81 | Receiver device, system, and method for low-energy reception of data | US12497519 | 2009-07-02 | US08335483B2 | 2012-12-18 | Frank Schmidt |
| A receiver device, A system and a method for reception of a signal having an amplitude that has been modulated with information, wherein a resistive element is provided that converts an electrical quantity into a physical parameter. | ||||||
| 82 | FM-AM demodulator and control method therefor | US12685960 | 2010-01-12 | US08213892B2 | 2012-07-03 | Nobunari Tsukamoto |
| A FM-AM demodulator includes a FM signal amplifier, a local oscillator, an image oscillator, a first selector, a first orthogonal mixer, an AM signal amplifier, a first frequency divider, a second frequency divider, a second selector, a second orthogonal mixer, a third selector, a first filter, a first amplifier, a fourth selector, a second filter, a second amplifier, a first gain controller, an I/Q compensation unit, an IF oscillator, a third orthogonal mixer, an adder, a channel filter configured to extract a signal with a predetermined frequency band output from the adder, a third amplifier, a second gain controller, a demodulator, and an I/Q compensation controller configured to generate an I/Q compensation signal to use for adjusting phase and gain of the I signal used in an I/Q compensation unit by detecting amplitude of the output signal from the demodulator, and output the generated signal to the I/Q compensation unit. | ||||||
| 83 | Thermal-mechanical signal processing | US11358917 | 2006-02-20 | US08072117B2 | 2011-12-06 | Maxim Zalalutdinov; Robert B. Reichenbach; Keith Aubin; Brian H. Houston; Jeevak M. Parpia; Harold G. Craighead |
| A source signal is converted into a time-variant temperature field with transduction into mechanical motion. In one embodiment, the conversion of a source signal into the time-variant temperature field is provided by utilizing a micro-fabricated fast response, bolometer-type radio frequency power meter. A resonant-type micromechanical thermal actuator may be utilized for temperature read-out and demodulation. | ||||||
| 84 | Detector of a radio-frequency signal | US12248581 | 2008-10-09 | US07839210B2 | 2010-11-23 | Gilles Bas; Marc Battista |
| A method and a circuit for detecting a radio-frequency signal, including at least one first MOS transistor with a channel of a first type, having its gate coupled to an input terminal capable of receiving said signal; a circuit for biasing the first transistor, capable of biasing it to a level lower than its threshold voltage; and a circuit for determining the average value of the current in the first transistor. | ||||||
| 85 | Method and Device for Detecting Simultaneous Double Transmission of AM Signals | US12513485 | 2008-04-21 | US20100067570A1 | 2010-03-18 | Friedrich Lipp |
| A device that detects the presence of several amplitude-modulated high-frequency signals in a sum signal with closely-adjacent carrier frequencies. The sum signal is phase-demodulated by a phase demodulator and Fourier-transformed by a Fourier-transformation device. On the basis of the Fourier transform, the presence of several carrier frequencies is determined by an evaluation device. | ||||||
| 86 | Receiver Device, System, and Method for Low-Energy Reception of Data | US12497519 | 2009-07-02 | US20100003937A1 | 2010-01-07 | Frank SCHMIDT |
| A receiver device, A system and a method for reception of a signal having an amplitude that has been modulated with information, wherein a resistive element is provided that converts an electrical quantity into a physical parameter. | ||||||
| 87 | DETECTOR OF A RADIO-FREQUENCY SIGNAL | US12248581 | 2008-10-09 | US20090096520A1 | 2009-04-16 | Gilles Bas; Marc Battista |
| A method and a circuit for detecting a radio-frequency signal, including at least one first MOS transistor with a channel of a first type, having its gate coupled to an input terminal capable of receiving said signal; a circuit for biasing the first transistor, capable of biasing it to a level lower than its threshold voltage; and a circuit for determining the average value of the current in the first transistor. | ||||||
| 88 | AMPLITUDE DETECTION APPARATUS | US12021606 | 2008-01-29 | US20080181338A1 | 2008-07-31 | RYUJI AONO |
| This disclosure concerns an amplitude detector comprising: a maximum-minimum detector detecting a maximum and a minimum values of a digital signals; a first and a second lowpass filters respectively having a cutoff frequency lower than a frequency of the waveform signal; a cycle detector detecting a cycle of the waveform signal; a correction coefficient generator generating a numeric value of a correction coefficient expressed by a calculation with respect to the cycle of the waveform signal and a cycle of the sampling; a first multiplier generating a corrected maximum value by multiplying the maximum value of the digital signals by the correction coefficient; a second multiplier generating a corrected minimum value by multiplying the minimum value of the digital signals by the correction coefficient; and an output portion outputting the corrected maximum value or an absolute value of the corrected minimum value as the amplitude of the waveform signal. | ||||||
| 89 | Thermal-mechanical signal processing | US11358917 | 2006-02-20 | US20060238239A1 | 2006-10-26 | Maxim Zalalutdinov; Robert Reichenbach; Keith Aubin; Brian Houston; Jeevak Parpia; Harold Craighead |
| A source signal is converted into a time-variant temperature field with transduction into mechanical motion. In one embodiment, the conversion of a source signal into the time-variant temperature field is provided by utilizing a micro-fabricated fast response, bolometer-type radio frequency power meter. A resonant-type micromechanical thermal actuator may be utilized for temperature read-out and demodulation. | ||||||
| 90 | Method for converting electric signals and a converter therefor | US10381852 | 2001-09-03 | US06949959B2 | 2005-09-27 | Georgy Mikhailovich Zaitsev |
| The invention relates to signal conversion devices to be used for the receiving radio devices. The attained technical result is the detection and conversion of signals in an electrical two-terminal device, a data loss level being minimal. A converting element is supplied with input signals, interaction of the fields of said signals in the converting element material is provided, which interaction is accompanied with the energy interchange resulting in appearance of the efficient electromotive force, and extracted is the converted signal complying with the following ratio: U ′ ( t ) = - γ [ R x { Σ U i ( t ) · U o ( t ) + U o ( t ) · Σ U i ( t ) } x o l where U′(t) is the efficient electromotive force in the converting element, Rx is Hall coefficient of the converting element conductive material (C/m3); l is length of the converting element along the current direction, (m); xo is the least one of linear dimensions of the converting element cross-section that is perpendicular to direction of the current flowing therein, (m); γ=τ·εo; εo is electric constant, εo≈10−11 C/V·m, τ is dimensions factor that represents a degree of interrelationship of the fields in a conductive medium ΣUi(t), where i=l . . . n is the combined voltage of the input convertible signals; Uo(t) is voltage of the input converting signal; at that, the ratio between the physical parameters and geometric parameters of the converting element and the sum of voltages of the input signals is selected with regard to the condition 2γ|Rx|U/xol≧1, where U is sum of voltages of the input signals. | ||||||
| 91 | Method and circuit arrangement for demodulating a digital amplitude-modulated radio signal | US11084216 | 2005-03-18 | US20050195023A1 | 2005-09-08 | Admir Alihodzic |
| Method and a circuit arrangement for demodulating a digital amplitude-modulated radio signal, received using a reception device, having a carrier signal and a digital information signal impressed thereon. The radio signal is split into first and second signal components having a same polarization and opposite phases, and the first and second signal components are respectively inverted and then “ANDed”. | ||||||
| 92 | Digital AM demodulator, particularly for demodulating TV signals | US09571965 | 2000-05-16 | US06748028B1 | 2004-06-08 | Luigi Della Torre; Marco Ronchi; Andrea Vitali |
| A digital AM demodulator, particularly for demodulating an input signal originating from a tuner, includes a first carrier generator for generating a first carrier signal which is not correlated with the input signal, and a multiplier for multiplying the first carrier signal by the input signal. Filters are arranged upstream and downstream of the multiplier for filtering undesired signals. The digital AM demodulator further includes a circuit for detecting a phase shift between a frequency of the input signal and a frequency of a local carrier signal. A correlation circuit correlates the first carrier signal with the input signal. The first carrier signal and the local carrier signal are mutually correlated, whereas the local carrier signal is not correlated with the input signal. | ||||||
| 93 | Analog technique to detect asymmetric radio frequency pulses | US958017 | 1997-10-27 | US6020839A | 2000-02-01 | Barry Thornton |
| Method and apparatus for processing an analog signal comprising one or more digital data streams encoded as a series of pulses is described. In a preferred embodiment, the analog signal is input to a mixer for mixing the signal with a signal of a local oscillator frequency to increase the frequency of the analog signal. The signal output from the mixer is applied to a narrow band filter such that a series of pulses is output from the filter when a signal of the frequency to which the filter is tuned is applied to the filter. The pulses are detected by a wave shaper, which uses them to identify the presence of a bit transition in the encoded data stream represented by the series of pulses. The wave shaper determines the polarity of the pulse, that is, whether it is positive or negative, which indicates whether the corresponding transition of the encoded data stream is positive or negative, respectively, then uses this information to reconstruct each digital bit, and hence the entire data stream. In an alternative embodiment, a plurality of filter/wave shaper pairs are used to recover multiple digital data streams from the analog signal. | ||||||
| 94 | Single side-band modulation system for use in digitally implemented multicarrier transmission systems | US591831 | 1996-01-25 | US5631610A | 1997-05-20 | Stuart Sandberg; Michael Tzannes |
| A communication system having a modulation system for transmitting a symbol set via a single side-band modulated carrier and a demodulation system for recovering the in-phase and quadrature signals from the modulated carrier. The modulation circuit receives M symbol values and generates M time domain samples for each of the in-phase and quadrature signals. The in-phase and quadrature signals can then be combined to generate the single side-band modulated carrier. The modulation circuit includes a transform circuit for generating M transformed symbol values by computing the transform of the M symbol values. A polyphase filter bank having 2M FIR filters is used to process the output of the transform circuit. Each filter has g taps, where g is an integer greater than 1. The outputs of the polyphase filters are combined with the outputs of the polyphase filters generated from a previously received set of M symbols to generate the M time-domain signal values of the in-phase signal. The quadrature signal is generated by a similar circuit having two additional elements. The demodulation circuit recovers symbol sets from the in-phase or quadrature signals generated from M received time-domain signal values. The demodulator includes a memory for storing the 2M most recently received time-domain values, a polyphase filter bank, a polyphase processing circuit, and a transform circuit. The demodulation circuit for recovering a symbol set from the quadrature signal is similar to that for recovering the symbol set from the in-phase signal, except that the polyphase processor combines the outputs of the polyphase filters according to a different set of relationships and the sign of every other output from the transform is changed. | ||||||
| 95 | Carrier detector | US486699 | 1995-06-07 | US5563914A | 1996-10-08 | Yasushi Sogabe |
| A carrier detector which is capable of performing high-accuracy carrier detection even with patterns other than a CR pattern by processing signals on the frequency axis, regardless of the existence of the residual frequency due to the quasi-coherent detection. The carrier detector converts a received signal having been subject to the quasi-coherent detection, A/D conversion, filtering for eliminating noises and expressed on the time axis into that expressed on the frequency axis by the time axis/frequency axis converting circuit. An accumulator 2 accumulatively adds the signals expressed on the frequency axis, and a decision section compares the accumulated value output from the accumulator to a predetermined threshold to detect the coming of the burst so as to detect the carrier. | ||||||
| 96 | Demodulator circuit and demodulating method employing bit error rate monitor | US180120 | 1994-01-12 | US5455536A | 1995-10-03 | Shinichi Kono; Tamio Okui |
| A demodulator circuit and a demodulating method are disclosed. A demodulator including a phase-locked loop for a receive carrier recovery or a phase lock recovery demodulates an input received signal and a band of a loop filter of the phase-locked loop is controlled by a control signal. A bit error rate monitor detects a bit error rate of a demodulated outputs the control signal on the basis of the bit error rate result of the demodulator, and a loop filter band controller output from the bit error rate monitor. Hence, the bit error rate of the demodulated signal is detected and the loop filter band of the phase-locked loop of the demodulator is controlled based on the detected bit error rate. As a result, an exact control of the loop filter band of the demodulator can be performed on the basis of the received signal state without using any received signal power detector, any C/N detector or the like. | ||||||
| 97 | Method and apparatus for demodulation of a signal transmitted over a fading channel using phase estimation | US837198 | 1992-02-14 | US5369670A | 1994-11-29 | Hatim Zagloul; Michel Fattouche |
| A method and apparatus for estimating the phase differential of a transmitted electromagnetic signal from the amplitude envelope of the signal. The apparatus includes a sampler, phase estimator and demodulator. The phase estimator uses a Hilbert transform or an approximation of the Hilbert transform to estimate the phase differential. The method may be applied to time domain or frequency domain signals. The phase differential is estimated by taking the differential of a function of the envelope, and applying the Hilbert transform to this differential. The resulting phase differential, after correction for sign ambiguity may be used to demodulate the received signal. | ||||||
| 98 | Digital signal processing type demodulation method and demodulation circuit | US354918 | 1989-05-22 | US5073904A | 1991-12-17 | Shigeki Nakamura; Yasufumi Takahashi |
| Disclosed is a digital demodulation technique in which a reception modulated-wave signal is converted into a digital signal in synchronism with a sampling frequency, whereafter carrier regeneration/detection is carried out upon the digital signal to thereby output a detection signal. Then, the detection signal is subject to interpolation and resampling on the basis of a clock frequency established asynchronously with and independently of the sampling frequency, so that a timing component is extracted from the detection signal in synchronism with the clock frequency to thereby output a reception data. In the digital demodulation technique, since the sampling frequency and the clock frequency are established asynchronously with and independently of each other, jitter or the like produced in clock regeneration do not affect the carrier regeneration/detection. Consequently, noiseless reception data with little jitters can be regenerated. | ||||||
| 99 | Logarithmic amplifier/detector delay compensation | US570607 | 1990-08-21 | US5070303A | 1991-12-03 | Paul W. Dent |
| An amplifier/detector chain logarithmically amplifies an input signal as well as compensates for delays generated by necessary bandwidth restrictions. A plurality of amplifiers are connected in series and grouped in amplifier stages with each stage having at least one amplifier. In between each amplfier stage is a filter which restricts the bandwidth of signals to frequencies in a desired signal range. When an amplifier stage includes more than one amplifier, a local summer sums the outputs detected by detectors associated with each amplifier in a particular stage. When an amplifier stage includes only a single amplifier associated detector, the local sum signal for the stage is simply the detector output. No local summer is required. Because of the time delay introduced by each interposed filter, each local sum is input to a corresponding compensating device which compensates for the associated time delay. Each compensating device stores its corresponding local sum until the local sum from the final stage is ready to be output. When all of the local summer outputs have been time-aligned or brought in phase, the local sums are connected from their corresponding compensating devices to a central summer stage. The output of the central summer represents the instantaneous output of the logarithmically amplified input signal. | ||||||
| 100 | Digital signal demodulation | US212246 | 1988-06-27 | US4859960A | 1989-08-22 | Richard T. A. Standford; Roger Biggs |
| A method of demodulating a high frequency carrier signal having at least one parameter modulated by a low frequency modulating signal comprises translating the signal to a low intermediate frequency, digitizing the translated intermediate frequency signal at a correspondingly low sampling rate and applying terms from the resulting digital time series to a non-linear processor to produce an output representative of the instantaneous value of the modulated parameter. Deriving an instantaneous value of the modulated parameter removes the need to use a high intermediate frequency for the carrier and enables the signal to be sampled at a low sampling rate. | ||||||
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