Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
191results about "Heterodyning/beat-frequency comparison" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Detecting malicious hardware by measuring radio frequency emissions
A method of testing an electronic device includes measuring radio frequency emissions at a plurality of positions relative to a trusted unit of a particular electronicdevice during operation of the trusted unit, and measuring radio frequency emissions at the same plurality of positions relative to a second unit of the particular electronic device. For each of the plurality of positions, the radio frequency emissions measured from the second unit are compared to the radio frequency emissions measured from the trusted unit. The method then determines whether there is any frequency at which the measured amplitude of the radio frequency emissions from the second unit and the measured amplitude of the radio frequency emissions from the trusted unit exhibit a statistically significant difference.
Owner:LENOVO GLOBAL TECH INT LTD
Electrical touch sensor and human interface device using the same
ActiveUS20060007181A1Accurate detectionMechanically variable capacitor detailsCapacitor with electrode distance variationTouchpadSignal generator
An electrical touch sensor is provided. The electrical touch sensor includes: a touch detection part having at least one touch pad and generating a first signal having a same delay time regardless of whether the object is in contact with the touch pad and a second signal having a varied delay time according to whether the object is in contact with the touch pad; and a contact signal generator generating a contact signal in response to the delay time-difference between the first and second signals. Therefore, it is possible to increase operation reliability by precisely determining whether the object is in contact with the pad, when the object has charge accumulation characteristics more than a certain level, although its conductive is insufficient. In addition, the electrical touch sensor can determine whether the object is in contact with the pad using only one pad to reduce a layout area of a product.
Owner:III HLDG 2
Sweep manager for signal analysis
ActiveUS20050035966A1Facilitate rapid （and easy） specificationImprove performanceSpectral/fourier analysisTwo-way working systemsGraphicsGraphical user interface
System and method for specifying a signal analysis function. First user input is received, e.g., to a graphical user interface (GUI), indicating a parameter for a first operation implementing at least a portion of the function. The first operation is programmatically included in a sweep loop. Second user input is received specifying a sweep configuration for a sweep on the parameter. The signal includes signal data, e.g., signal plot data or tabular data. The sweep configuration includes: a range of values for the indicated parameter, a number of iterations for the sweep, an interpolation type, step size for the sweep on the indicated parameter, specific values in the range of values for the parameter, source for at least some of the sweep configuration, and / or resultant data. The sweep is performed on the parameter per the sweep configuration, generating resultant data which is stored, and optionally displayed, e.g., in the GUI.
Owner:NATIONAL INSTRUMENTS
HAND-HELD MICROWAVE SPECTRUM ANALYZER WITH OPERATION RANGE FROM 9 KHz TO OVER 20 GHz
ActiveUS20090160430A1Component is expensiveLow costSpectral/fourier analysisMultiple-port networksDielectricSpectrum analyzer
A spectrum analyzer is provided that includes components to achieve from below 9 kHz to above 20 GHz operation range while remaining hand-held. Components of the spectrum analyzer include an integrated precision stand-alone step attenuator that does not rely on printed circuit board (PCB) mounted circuit elements within the signal path. Further, a PIN diplexing switch separates signals into different base-band and highband paths. The baseband path includes a pre-amplifier for low frequency signals, while the higher frequency bands may not necessarily include a pre-amplifier. The baseband path further provides improved broadband termination of its 1st mixer IF port by incorporating a new quadrature-coupled directional (QCD) filter that includes a ring resonator. An inexpensive air dielectric multi-cavity baseband filter is also used to suppress 2nd mixer IF images. The highband path incorporates multi-throw MMIC PIN diode switches to selectively filter different bands of input signals. At least three total 1st mixers are used to increase operation bandwidth. A phase locked loop providing a 1st LO to the 1st mixers is created that uses a divide-by-two frequency divider in cascade with a sampler-type frequency downconverter. The output of the 1st LO is frequency doubled and filtered to increase the frequency range of the highband signal path.
Owner:ANRITSU CO
Improved method and apparatus for measuring stability of frequency of time domain signal
InactiveCN1963543AReasonable compositionSimple compositionFrequency to phase shift conversionHeterodyning/beat-frequency comparisonFrequency stabilizationProcess measurement
This invention discloses one method and device to improve time zone signals frequency stability measurement, which comprises the following steps: reference time signals are processed through DDS technique to get stable and accurate circle signals; expending measurement frequency signals range to get better reference signals and signals to be tested at fine time measurement; using DDS unit to process measurement frequency signals; when circle sample time singles come, according to fine time measurement module minimum resolution rate to test signals to be tested with reference time signals minimum phase difference to make the meter work to fulfill frequency signal measurement.
Owner:JIANGHAN UNIVERSITY
Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals
ActiveCN101871965AStrong noiseStrong interferenceCurrent/voltage measurementVoltage-current phase angleVoltage amplitudePhase difference
The invention discloses a method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals. In the method for detecting zero crossing time, by using the fundamental principle that a sinusoidal signal close to the zero crossing can be approximately equivalent to a linear signal, after a zero crossing position of a signal is worked out by rough calculation, a voltage amplitude close to the signal zero crossing is counted by the unary linear regression theory so as to acquire the zero crossing time of the sinusoidal signal. The method for detecting a frequency of a zero crossing point of a sinusoidal signal comprises the following steps of: obtaining a period value of each zero crossing point by carrying out the cumulative mean on each zero crossing point phase different of the obtained signal, and solving the reciprocal to obtain the signal frequency value. The method for detecting phase difference comprises the following step of calculating the phase difference between different signals by means of a zero crossing point phase value of each different signal. The invention is insensitive to the relative position of the zero crossing point of the actual signal, can realize higher detection accuracy in the digital detection system, has a strong suppression function to the noise of the signal source and the interference, and finally ensures the application of the method in a high-accuracy detection field.
Owner:WASION GROUP HLDG
Method and apparatus for limiting access to an integrated circuit (IC)
ActiveUS20140035560A1Electrical testingPower supply for data processingClock rateLow power dissipation
A method and apparatus for limiting access to an integrated circuit (IC) upon detection of abnormal conditions is provided. At least one of abnormal voltage detection, abnormal temperature detection, and abnormal clock detection are provided with low power consumption. Both abnormally low and abnormally high parameter values (e.g. abnormally low or high voltage, temperature, or clock frequency) may be detected. Abnormal clock detection may also detect a stopped clock signal, including a clock signal stopped at a low logic level or at a high logic level. Furthermore, abnormal clock detection may detect an abnormal duty cycle of a clock signal. A sampled bandgap reference may be used to provide accurate voltage and current references while consuming a minimal amount of power. Upon detection of an abnormal parameter value, one or more tamper indications may be provided to initiate tampering countermeasures, such as limiting access to the IC.
Owner:NXP USA INC
High frequency measuring circuit
InactiveUS6161420ALow costReduce concentrationVibration measurement in solidsAnalysing fluids using sonic/ultrasonic/infrasonic wavesAcoustic waveOscillistor
An electrical circuit and method for measuring small variations in a high frequency signal is disclosed. The circuit generates a coarse measurement of the input signal frequency and a reference signal having the same frequency as the frequency represented by the coarse measurement. The circuit measures the difference in frequency between the input signal and the reference signal, and adds the coarse measurement and the difference measurement to determine the frequency of the input signal. The circuit may be used in conjunction with a piezoelectric acoustic wave device and oscillator to provide an apparatus for accurately measuring low concentrations of a gas.
Owner:FISHER CONTROLS INT LLC
System and method for testing a clock circuit
A test circuit determines whether a frequency of an output clock signal of a clock circuit is above an output threshold frequency. An input clock signal of the clock circuit is set to an elevated frequency that is higher than a specified frequency. A first counter counts the number of clock cycles of the input clock signal in a test interval to within a tolerance of the elevated frequency. The tolerance of the elevated frequency is higher than a tolerance of the specified frequency. A second counter counts the number of clock cycles of a feedback clock signal in the test interval. A comparator determines whether the frequency of the output clock signal is above the output threshold frequency based on the number of clock cycles of the input clock signal and the number of clock cycles of the feedback clock signal.
Owner:INTEGRATED DEVICE TECH INC
Quantifying silicon degradation in an integrated circuit
InactiveUS20140176116A1Accurate measurementReduce power consumptionSolid-state devicesElectrical testingEngineeringReference circuit
A first instance and a second instance of an oscillating circuit are each formed as part of an integrated circuit and are used to monitor degradation over time of one or more portions of the integrated circuit. The first instance of the oscillating circuit is configured to be coupled to a power source during normal operation of the integrated circuit and the second instance is configured to be decoupled from the power source. Over the lifetime of the integrated circuit, the first instance undergoes degradation from use while the second instance of the oscillating circuit remains unpowered, therefore experiencing essentially no use-related degradation. During a testing operation, the second instance can be used as a reference circuit that accurately quantifies use-related degradation of the first instance of the oscillating circuit and, by extension, one or more portions of the integrated circuit.
Owner:NVIDIA CORP
Synthetic instrument unit
ActiveUS20120020397A1Spectral/fourier analysisProduction of permanent recordsDigital signal processingSynthetic instrument
Systems and other embodiments associated with synthetic instrumentation are presented. A reconfigurable synthetic instrumentation unit comprises an input module, with dual input / output ports and conditioning logic to condition an input signal. An RF down converter selectively down converts the conditioned input signal. A sampled RF down converter selectively samples the conditioned input signal. A pair of narrowband A / D converters are configured to convert one of the conditioned signal, the down converted signal and the sampled signal to produce a narrowband digital signal. A pair of broadband A / D converters convert at least one of the conditioned signal, the down converted signal and the sampled signal to produce a broadband digital signal. Signal processing logic selectively performs digital signal processing on the broadband digital signal or the narrow band digital signal.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC
Portable ultra wide band handheld VNA
ActiveUS7019510B1Prevent repeatabilityAvoid temperatureResistance/reactance/impedenceHeterodyning/beat-frequency comparisonHand heldEngineering
A handheld Vector Network Analyzer (VNA) is provided with circuitry capable of providing operation over a very wide bandwidth. The VNA includes two reflectometers, a first high frequency reflectometer (150) such as the model S331 Site Master™ and a second lower frequency reflectometer (50) such as the model S820 Site Master™, both the S331 and S820 being manufactured by Anritsu Company of Morgan Hill Calif. The high frequency reflectometer (150) includes a forward coupler (109) having a coupling path connected to a high frequency impulse signal source (102), and a through path connecting the test port (3) and incident and reflected signal measurement couplers (110,112) to a load (107). To connect the high and low frequency reflectometers (150,50), a diplexer (170) is connected between the load (107) and an output of the low frequency reflectometer (50). The diplexer (170) includes an inductor (172) for blocking high frequency signals from the low frequency reflectometer (50), and a capacitor (174) preventing a low frequency signal path through the load (107) to ground while providing an impedance matching the load (107) to high frequency signals.
Owner:ANRITSU CO
Automated electronic calibration apparatus
ActiveUS6965241B1Resistance/reactance/impedenceHeterodyning/beat-frequency comparisonEngineeringDevice under test
Testing is performed on a device under test. A first port of a first calibration module is connected to the device under test. A second port of the first calibration module is connected to a network analyzer. A first port of a second calibration module is connected to the device under test. A second port of the second calibration module is connected to the network analyzer. A measurement calibration and testing are performed without disconnecting the first port and the second port of the first calibration module and without disconnecting the first port and the second port of the second calibration module.
Owner:KEYSIGHT TECH
Ventricular shunt system and method
Owner:ST JUDE MEDICAL LUXEMBOURG HLDG II S A R L SJM LUX II
Sensor system and method
ActiveUS20100289479A1Increase amplitudeReduce the amplitudeOscillations generatorsTransmissionRelative magnitudeRelative amplitude
The present invention provides a sensor system and a corresponding sensing method employing the sensor system. The sensor system comprises a sensor (12) having an input (20) and an output (22), a feedback path (16) from the output to the input, and a filter (14; 92) in the feedback path. The filter comprises a narrow band filter, which is tuned or tunable to a respective one of signals that are wanted signals and signals that represent interference signals. The sensor and the filter are arranged so as to alter the relative amplitudes of the wanted signals and the interference signals in order to increase the relative amplitude of the wanted signals and reduce the relative amplitude of the interference signals.
Owner:THE UNIV OF SUSSEX
Frequency and phase difference precision measurement method based on frequency and phase relationship auxiliary processing
InactiveCN102508024AAccurate captureEasy to measureHeterodyning/beat-frequency comparisonMicrocontrollerPhase difference
The invention discloses a frequency and phase difference precision measurement method based on frequency and phase relationship auxiliary processing. The frequency and phase difference precision measurement method comprises the following steps of: allowing a 10-MHz frequency scale output by a caesium clock to pass through a shaping circuit and an adjustable pulse generation circuit to generate a pulse signal; automatically synthesizing frequency f0 by using a digital display scope (DDS), wherein the value of the f0 depends on fx roughly measured by a singlechip microcomputer, so that the integer multiple of the group period of the fx and the f0 is equal to the time value of a gate and the value of the group phase quantum of the fx and the f0 is equal to the resolution ratio of a group phase coincidence detection circuit; transmitting the f0 and the fx to a pilot frequency phase coincidence detection circuit to generate the actual measurement gate; controlling work of a counter; calculating the value of the fx according to the counting result by using a microprogrammed control unit (MCU); and finally displaying output by using a liquid crystal display (LCD). According to the frequency and phase difference precision measurement method disclosed by the invention, one DDS is introduced to determine the frequency relationship between the fx and the f0, and a good measuring effect of any frequency signals within the required gate time is achieved.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Pulse modulated PIM measurement instrument
ActiveUS8760148B1Reduced Power RequirementsMinimal sized partDynamo-electric motor metersMeasurement through mechanical displacementAudio power amplifierAnalog signal
A device to measure a passive intermodulation (PIM) creating component is provided that uses minimal average power. For a PIM measurement, two separate signals F1 and F2 are generated to simulate signals, such as from two different types of cell phone operating bands being transmitted in the same area or two different transmit frequencies within one cell phone operating band. PIMs are measured to assure interference is not created on one of the cell phone bands. Minimal power is used by connecting pulse width modulators (PWM) to provide DC power to the high power amplifiers (HPA) creating the signals F1 and F2. By controlling the duty cycle of the PWM to limit ON time of the HPAs to approximately 10%, significant average power savings occur. Size is also reduced with reduced power consumption because heat sinks and other cooling components are not required.
Owner:ANRITSU CO
Detection of data transmission rates using passing frequency-selective filtering
A data receiver, which could be an optical transceiver, a modem, a router hub, is capable of detecting the transmission rate of incoming data. The data is converted to electrical waves appropriate for passive or active bandpass filtering. The frequencies at which the waves are filtered are determined from a plurality of known possible transmission rates and are chosen as having the most detectable difference in the power spectra. By implementing a filter at the corresponding frequency(ies), data having that (those) frequency(ies) will be transmitted. A signal detector then can receive a signal transmitted through the filter and determine the corresponding data rate. It is further contemplated that the multiple frequencies can be filtered by using stages of filters and signal detectors for different frequencies or by filters and detectors capable of multiple frequency operation.
Owner:IBM CORP
Apparatus for Very High Speed Adaptive Spectrum Analysis
InactiveUS20140240605A1Down speed of measurementQuick verificationTelevision system detailsColor television detailsMicrowave frequency rangeFrequency spectrum
This invention describes a method by which Broadband Spectrum Analysis can be performed in the Rh and Microwave frequency range with significantly higher speed, accuracy, and flexibility than existing RF and Microwave Spectrum Analyzers. This is done by eliminating the need for the filtering of the incoming signal, a process called preselection that needs to track in frequency with the scanning local oscillator in the instrument. By eliminating this requirement, this invention makes possible the identification and analysis of very broadband signals in a single sweep using an Adaptive Sweep Methodology and a Simultaneous Sweep capability that the present invention makes possible.
Owner:BASAWAPATNA GANESH RAMASWAMY +3
Method for measuring a three-port device using a two-port vector network analyzer
ActiveUS20050258815A1Resistance/reactance/impedenceHeterodyning/beat-frequency comparisonSignal sourceTest set
A method for vector characterization of a frequency translation device (“FTD”) includes coupling a first signal from a first signal source through a reference directional coupler and through a test directional coupler of an electronic test set to a first port of the FTD. A second signal from the reference directional coupler is coupled to a first receiver of a vector network analyzer (“VNA”). A third signal is coupled from the test directional coupler to a second receiver of the VNA; and a vector parameter of the first port of the FTD is measured with the VNA.
Owner:KEYSIGHT TECH
Measuring device, in particular vectorial network analyzer, with separate oscillators
ActiveUS6970000B2Resolution problemShorten the timeResistance/reactance/impedenceHeterodyning/beat-frequency comparisonMeasurement deviceFrequency mixer
A measuring device (e.g., a vectorial network analyzer) by means of at least two ports can be connected to a device under test and has associated excitation / receiving units (ERUs), each thereof having one port. At least one ERU has a signal generator, which can apply an excitation signal onto a device under test. Each ERU possesses two receiving apparatuses (each with a mixer in connection with an oscillator signal) to receive the excitation signal, the reflected signal from the associated port or the signal transmitted to the associated port and converts said signal into an intermediate signal. Each ERU exhibits its own oscillator separate from the signal generator, and generates the oscillator signal for the mixer of the receiving apparatus of the ERU, whereby the frequency and / or phase of the oscillator signals, can be adjusted independently of the frequency and / or phase of oscillator signals of the oscillators of other ERUs.
Owner:ROHDE & SCHWARZ GMBH & CO KG
Hand-held microwave spectrum analyzer with operation range from 9 KHz to over 20 GHz
ActiveUS8159208B2Useful frequency rangeImprove dynamic rangeSpectral/fourier analysisMultiple-port networksDielectricSpectrum analyzer
Owner:ANRITSU CO
Frequency conversion sweep measuring method
InactiveUS6861833B2Spectral/fourier analysisHeterodyning/beat-frequency comparisonFrequency spectrumSpectrum analyzer
A preselector is omitted in a spectrum analyzer, for example, which is used to prevent an image signal from being inputted. In addition, an image signal of a signal which is located outside a range of set-up measured frequencies is suppressed as much as possible. For a range of set-up measured frequencies F1˜F2, and for each of a plurality of intermediate frequencies Fi, the frequency of the sweep signal is swept over a range F1+Fi˜F2+Fi to determine first measured data, and is also swept over a range F1−Fi˜F2−Fi to determine second measured data. The first and the second measured data are compared against each other for each measured frequency point, and if they are equal, the data value obtained or a data value having a minimum value unless they are not of an equal value is delivered to obtain measured data in which image data based on image signals has been suppressed.
Owner:ADVANTEST CORP
Frequency detection mechanism for a clock generation circuit
ActiveUS20110234287A1Digital variable displayFrequency/rate-modulated pulse demodulationEngineeringFrequency detection
A frequency detection mechanism for a clock generation unit on an integrated circuit includes a clock generation unit and a detection unit. The clock generation unit may generate an output clock signal at a predetermined frequency that corresponds to a frequency multiple of a reference clock signal provided as an input to the clock generation unit. The detection unit may determine whether the output clock signal is at the predetermined frequency. As such, the detection unit includes a first counter that may generate a first count value based upon the reference clock signal and a second counter that may generate a second count value based upon the output clock signal. The detection unit also includes comparison logic that may perform a plurality of multiplication operations on the first and second count values and generate a final result that indicates whether the output clock signal is at the predetermined frequency.
Owner:APPLE INC
Apparatus and method for measuring active and reactive powers
ActiveUS20100088049A1Electric devicesAmplifier modifications to reduce noise influenceEffective powerHarmonic
A method and device for measuring active power of AC with respect to a fundamental frequency or harmonic frequencies using a DPLL include generating via the DPLL a pair of substantially mutually orthogonal sinusoid signals in response to an input voltage data signal, mixing a first sinusoid signal of the pair with a current data signal of the alternating current via a first low-pass filter, mixing the first sinusoid signal of the pair with a voltage signal of the alternating current via a second low-pass filter, and computing an active power of the alternating current based on a further mixing of an output from the first low-pass filter and an output from the second low-pass filter.
Owner:ANALOG DEVICES INC
Frequency extension module for microwave and millimeter wave spectrum analyzers
In accordance with an embodiment, an apparatus for analyzing signals comprises a spectrum analyzer and a frequency extension module. The spectrum analyzer includes an IF switch which switches between an internal IF signal and an external IF signal, and a LO coupler which is configured to output a portion of one or more LO signals. The frequency extension module is configured to receive the one or more LO signals from the spectrum analyzer and send an IF signal to the spectrum analyzer. A diplexer band switch is used to direct the low band signals to the spectrum analyzer and to direct the high band signals to the frequency extension module where they are downconverted to the external IF which is output to the IF switch.
Owner:ANRITSU CORP
Frequency detection mechanism for a clock generation circuit
ActiveUS20120019301A1Digital variable displayFrequency/rate-modulated pulse demodulationEngineeringFrequency detection
A frequency detection mechanism for a clock generation unit on an integrated circuit includes a clock generation unit and a detection unit. The clock generation unit may generate an output clock signal at a predetermined frequency that corresponds to a frequency multiple of a reference clock signal provided as an input to the clock generation unit. The detection unit may determine whether the output clock signal is at the predetermined frequency. As such, the detection unit includes a first counter that may generate a first count value based upon the reference clock signal and a second counter that may generate a second count value based upon the output clock signal. The detection unit also includes comparison logic that may perform a plurality of multiplication operations on the first and second count values and generate a final result that indicates whether the output clock signal is at the predetermined frequency.
Owner:APPLE INC
Photoelectric frequency response tester and test method thereof
ActiveCN107085143AEnables self-calibrating measurementsReduce cost of measurementHeterodyning/beat-frequency comparisonFrequency spectrumEngineering
The invention relates to a photoelectric frequency response tester and a test method thereof. The photoelectric frequency response tester is composed of a frequency shift heterodyne module, a microwave clamp module, a radio frequency module and a control and data processing module. The frequency shift heterodyne module is composed of a directly modulated laser to be tested, a tunable laser, an optical switch, an electro-optic modulator to be tested, an optical frequency shift unit, an optical local oscillation unit, a reference source and a photoelectric detector to be tested. The microwave clamp module provides a microwave switch and different radio frequency port use scenes. The radio frequency module is composed of a main microwave source and an amplitude phase receiving unit. The optical switch and the microwave switch are controlled, the frequency relation of the sinusoidal microwave signals outputted by the main microwave source and the reference source is set, and the required spectrum sideband is analyzed through cooperation of the amplitude phase receiving unit so that the frequency response characteristic parameters of the directly modulated laser to be tested, the electro-optic modulator to be tested and the photoelectric detector to be tested can be acquired, additional calibration test of the conventional method can be eliminated, the test cost of the photoelectronic device can be reduced, and the test accuracy and the flexibility and the reliability of the device can be enhanced.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Apparatus and method for fading frequency estimation
InactiveUS20060007904A1Estimate a fading frequency efficiently and accuratelyIncrease added valueSpectral/fourier analysisReceivers monitoringCommunications systemPilot signal
The invention relates to an apparatus and a method for estimating a fading frequency of incoming received waves in a receiving station of a radio communication system or radio transmission system. An object of the invention is to estimate a fading frequency efficiently and accurately without substantially complexing the configuration of the system. To this end, the invention provides an apparatus for estimating a fading frequency from a pilot signal in a reception signal, which includes a calculation unit for calculating a magnitude of a complex product of two symbols that are received at different instants, and an estimation unit for estimating a fading frequency according to the calculated magnitude of the complex product.
Owner:FUJITSU LTD
Method and device for measuring pulse frequency
ActiveCN102353837AThe detection method is simpleLow costHeterodyning/beat-frequency comparisonMicrocontrollerCapacitance
The invention discloses a method and a device for measuring pulse frequency. The method comprises: firstly an RC delay unit stores phase difference information, and charging or discharging operation is carried out by use of a measured signal level in case of change of the measured signal level, wherein, a capacitive voltage reflects the phase difference between a measured signal and a measuring clock; a rising edge phase difference detection unit converts the capacitive voltage on the RC delay unit into digital quantity in the case of rising edge of the measured signal; a falling edge phase difference detection unit converts the capacitive voltage on the RC delay unit into digital quantity in the case of falling edge of the measured signal; a data caching unit caches the converted data; a timing sequence control unit controls the timing sequence of the measurement process; and an embedded single-chip microprocessor carries out compensation on the measured signal by means of the measured phase difference information so as to finally achieve the purpose of measuring the pulse frequency. By adopting the technical scheme, the measurement indeterminacy and errors can be effectively lowered, and the frequency measurement accuracy can be improved; and the real-time property is good, the cost is lower, and the implementation is easy.
Owner:GUODIAN UNITED POWER TECH
Popular searches
Electric analogue stores Character and pattern recognition Electronic switching Cathode-ray tube indicators Circuit interrupters testing Input/output processes for data processing Keyboard-like device coding Specific program execution arrangements Special data processing applications Drawing from basic elements
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com