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WO/2002/097448A1 |
This invention relates to a method for determining the frequency of the current ripple contained in the armature current signal of a commutated d.c motor. Said frequency is determined by calculating the difference between the result obta...
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WO2001027605A9 |
A highly time resolved impedance spectroscopy that enhances the measurement of the dynamics of non-stationary systems with enhanced time resolution. The highly time resolved impedance spectroscopy includes an optimized, frequency rich a....
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WO/2002/093181A1 |
A waveform detector having a signal processing function for producing an output waveform by detecting, by characterizing, a transient state variation having no periodic repetition or by subjecting an input waveform to 1/f fluctuation con...
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WO/2002/084234A1 |
The apparatus is an asynchronous data logger (ADL) comprises a sensor (1) and, in a preferred embodiment, three sampling channels. Each channel comprises an analogue to digital (A/D) converter (3), a sampling clock (4), a memory (5) and ...
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WO/2002/082106A1 |
The invention concerns a device and a method for analysing a digital audio signal (C) for use for identifying musical notes present in a sound, audio or musical signal. The invention is characterised in that the method consists in: creat...
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WO/2002/073222A1 |
A frequency analyzing method and apparatus, and a spectrum analyzer capable of surely detecting and displaying a radio wave which has been subjected to frequency diffusion or is a low level. A signal to be measured and present in a measu...
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WO/2002/063258A1 |
The inventive method is characterised in that the recording of a node and antinode system of an electric field intensity of an optical standing wave is carried out on a periodical array structure which is formed by line marks of a thin p...
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WO/2002/059632A1 |
A waveform digitizer device which is provided with N pieces of A/D converters connected in an interleave configuration when the number of interleave phases is N (at least 2), samples a sampling timing of each A/D converter at a specified...
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WO/2002/048719A2 |
The present invention, generally speaking, provides a method and apparatus for accurately measuring a communications signal. In accordance with one aspect of the invention, DC offset effects and nonlinearities attributable to a communica...
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WO/2002/029426A1 |
For example, a preselector for preventing an image signal from being inputted is omitted from a spectrum analyzer, and thereby the image signal out of the preset measurement frequency range can be suppressed. Intermediate frequencies F¿...
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WO/2002/027336A2 |
A method and circuitry for implementing a built-in self test (BIST) for determining the frequency characteristics of filter circuits in mixed-signal integrated circuits (ICs). The method comprises inserting a Circuit Under Test (CUT) int...
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WO/2002/021282A1 |
A signal processing device for determining at least one parameter of a signal, comprises: a shift register (3) arranged to receive a quantized digital signal and arranged to store temporarily a number of bits corresponding to the number ...
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WO/2002/011295A2 |
A measuring device (1), for measuring the spectrum of a measured signal in several neighbouring channels (15¿-9?-15¿9?) of a working channel (14), comprises a selective filter (9) which damps the working channel (14) more strongly than...
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WO2001033547B1 |
A basilar membrane model is used to receive an input signal including a target signal in step I. With successive further steps the target signal is filtered from the input signal. After the filtering the target signal can be used as an i...
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WO/2001/087833A2 |
A system and method for storing carbohydrate sequences in an organized database, which is preferably available to a plurality of users through a network such as the Internet. Optionally and preferably, the sequences can be searched and r...
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WO/2001/089086A1 |
Modeling a target spectrum (S) is provided by determining (21) filter parameters (p¿i?,q¿i?) of a filter which has a frequency response approximating the target spectrum (S), wherein the target spectrum is split in at least a first par...
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WO/2001/087832A2 |
A method for storing, retrieving, comparing and analyzing complex carbohydrates, by representing complex carbohydrates with a simple linear code, which is preferably also able to represent branches within the carbohydrate structure. The ...
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WO/2001/071368A1 |
The invention relates to a frequency sensor and to a method for monitoring the frequency of digital signals for which the period (T¿IN?) of an input signal (IN) is evaluated. A time base is provided by a counter (BC) which is commutated...
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WO/2001/047086A1 |
A distribution series capacitor control system is provided with a sub-harmonic detection module (100) connected to an input signal and operable to detect the presence of at least two distinct types of sub-harmonic content in the input si...
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WO/2001/042798A1 |
A filterbank comprises a plurality of multipliers (M¿o?...M¿M-1?) connected to receive respective samples (x(n)...x(n-M+1) of an input signal and operable to multiply the samples by respective coefficients (c¿0?(k)...c¿M-1?(k)) to pr...
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WO/2001/037502A1 |
An analysis operation unit performs frequency analysis of a modulated signal to be analyzed outputted from a level converter and modulation analysis of a modulated signal selected by a signal selection circuit by using a digital signal c...
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WO/2001/036989A1 |
A sweep control unit supplies a current from a current drive circuit to a YTO to allow the YTO to oscillate at frequencies that correspond to a first range of the oscillation frequency of the YTO designated, as a desired frequency range,...
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WO/2001/031350A1 |
A control system for a failure mode testing system is described. The control system employs at least one control algorithm that enables the testing system to be operated at optimal pressure and frequency levels in order to generate a des...
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WO/2001/029969A1 |
Frequency measurement units (10, 21, K0) which count reference clocks (Cb) are provided. The frequency measurement units count the reference clocks during periods shifted from each other. An adder (14) is provided which adds the counts o...
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WO/2001/025811A1 |
In order to determine the complex transmission function of a measuring device, a line spectrum is generated by a pulse generator, configured, for example, as a step-recovery diode and said line spectrum is stored. The digitised output si...
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WO/2001/003445A2 |
The invention relates to a method for determining tone ringing frequency which comprises the following steps: Forming a zero crossing signal from a tone ringing signal by comparing the tone ringing signal with a threshold (S), whereby th...
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WO/2000/070357A2 |
A noise measurement test system is provided for making phase noise measurements of a unit under test (UUT). The noise measurement test system comprises a variable amplifier, a variable low noise source, a variable phase shifter, a mixer,...
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WO/2000/069042A1 |
A method and system for synchronizing the sampling frequency, at which power system data is sampled, with the frequency of the power system. Adjustments to the sampling frequency can be made by comparing first and second derivatives to t...
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WO/2000/043907A1 |
The invention relates to a method and device for determining the first moment f of the frequency spectrum of time signals. According to the method, a favorable signal-to-noise ratio should be made possible. Furthermore, the circuit for r...
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WO/2000/033230A1 |
A system and method for improving the ability of an electronic meter (14) to make measurements on signals to determine content of different frequencies, and harmonics of the fundamental frequency, of AC signals (voltages and currents). T...
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WO/2000/031556A1 |
The invention provides a method of on-line diagnosis of insulation degradation in a portion of underground cable comprising: i) measuring the current flow at first and second locations of the cable utilizing an optical current sensor at ...
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WO/2000/022444A1 |
The invention relates to an improved adaptive spectral estimator for estimating the spectral components in a signal (205) containing both an information signal, such as speech, and noise. A method and system provide for generating noise ...
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WO/2000/020875A1 |
The present invention relates to an analyzer, especially a frequency response analyzer (10), comprising a clock-pulse generator (22) that produces a periodic clock-pulse signal (Sclk), a first signal generator (24) that produces a period...
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WO/2000/021190A1 |
A frequency to frequency de-randomiser circuit having means for smoothing a current which comprises a diode filter configured so as to have a time constant which changes in response to changes in the current thus providing a rapidly resp...
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WO/2000/010017A1 |
A method of determining parameters of a harmonic pollution source connected to a power line at a connection point. The harmonic pollution source is a power customer (22C) and the power is supplied by an electric utility (20). The electri...
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WO/2000/005591A1 |
The invention consists in an apparatus for and a method of generating a test signal (T'), the method comprising the steps of generating at least first and second main signals (f¿1?, f¿2?), the first main signal having a frequency compo...
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WO/2000/002056A1 |
The present invention relates to a method for measuring a frequency f = $g(v)/2$g(p) of a sinusoidal signal V(t) = Asin($g(v)t + $g(a) with an essentially constant amplitude A. The method comprises registration of measured values in the ...
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WO/1999/062177A1 |
The invention relates to a method for deriving a frequency of a clock signal, wherein a system frequency is used when the measured periods of a system frequency clock signal remain within predetermined tolerance limits. Otherwise, the fr...
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WO/1999/061925A1 |
Prior to performing a centroid calculation on a waveform that is discretely sampled at a limited number of sample points, the last sample point (V¿N?, A¿N?) is eliminated if the magnitude of the amplitude at the first sample point (A¿...
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WO/1999/049326A1 |
The invention relates to a vector network analyser whose transmitting and receiving sides each have a superheterodyne receiver with down conversion. The high-voltage power supply for providing the accelerating voltage in the millimetre-w...
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WO/1999/046608A1 |
A method for presenting information and a digital storage oscilloscope are disclosed in which primary measurements of a signal are performed and displayed. Parameters are also derived for the signal based upon the primary measurement dat...
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WO/1999/038018A1 |
The invention relates to a method for estimating the frequency of a time signal by means of a discrete Fourrier transformation and interpolation between support points of the DFT spectrum. According to said method, the hamming window is ...
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WO/1999/033281A1 |
Supervisory audio tone (SAT) in a receive signal in a wireless communications system is detected using a discrete Fourier transform (DFT) supplied with samples of a filtered and decimated signal derived form the receive signal. The DFT c...
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WO/1999/026073A1 |
The invention is a method and system for monitoring at least one of a system, a process and a data source. A method and system have been developed for carrying out surveillance, testing and modification of an ongoing process or other sou...
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WO/1999/024839A1 |
A 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 repre...
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WO/1999/022249A1 |
The invention relates to a method and a measuring unit for verifying the presence of a proper neutral conductor connection between a four wire system and a measuring unit, especially an electricity consumption meter, in a four wire syste...
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WO/1999/021020A1 |
A circuit for measuring the frequency of an electrical signal includes a detector (52) that senses a reoccurring phase point of the electrical signal. A divide-by-M counter (56) is connected to the detector and produces a control signal ...
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WO/1999/012046A1 |
A pointer indicator of which the pointer neither springs nor oscillates. A smoothing circuit (5) finds the difference $g(u) = |T(n) - D(n-1)| between the deflection angle T(n) and the indication angle D(n-1). A variable constant N (= (M-...
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WO/1999/009424A1 |
Electric arc monitoring is effected by exploiting the discovery that electric arcs are fractal phenomena with all essential information that signifies 'arc' contained in each fractal subset. These fractal subsets are logarithmically dist...
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WO/1999/009422A1 |
Electric arc monitoring is effected by exploiting the discovery that electric arcs are fractal phenomena in that all essential information that signifies 'arc' is contained in each fractal subset. These fractal subsets are logarithmicall...
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