214 results about "Large peak" patented technology

A magnetic recording medium of the present invention includes a non-magnetic substrate, and a magnetic layer containing a magnetic powder. The magnetic powder is constituted by an ε-iron oxide powder. The magnetic layer has a squareness in a thickness direction of 0.65 or more. In a differential curve obtained by differentiating a hysteresis curve in the thickness direction of the magnetic layer, two or more peaks are present. In a case where, out of peaks in the same direction among the above-described peaks, a local maximum of a largest peak in a magnetic field range of +500 oersted [Oe] or more is taken as P1 and a local maximum of a largest peak in a magnetic field range of −500 oersted [Oe] or more and less than +500 oersted [Oe] is taken as P2, a relationship below is satisfied:0.25≦P2 / P1≦0.60.

The subject invention pertains to a frequency modulation continuous wave (FMCW) radar system. Embodiments relate to methods of improving the performance of such a FMCW system and improving the value of the information provided by such a FMCW system. In an embodiment of the subject invention, the IF level can be monitored while sweeping the frequency of the system through at least a portion of the frequency range of the system. In a specific embodiment, the system is then set to the frequency that produces the minimum IF level, which is the frequency that produces the minimum AM signal level. Embodiments of the invention pertain to techniques for expediting the adaptation of the comb filter to the signal when the system is turned on. In an embodiment, in order to reduce the number of detection calculations a processor performs every frame, a method of quickly determining the largest peaks in the RDM is implemented. Embodiments of the subject invention relate to a method for processing a radar signal that classifies two or more targets. A specific embodiment of a method for processing the radar signal classifies a human target or other target(s) using amplitude values in time-consecutive range-Doppler maps. Embodiments of the invention pertain to a method for processing a radar signal for improving the performance of FMCW detection, tracking, and classification algorithms. Embodiments improve such performance by increasing the SNR and velocity measurement resolution of slow moving targets while minimizing DSP computational and memory requirements in two-dimensional FFT range-velocity processing.

Embodiments pertain to methods of improving the performance of a frequency modulation continuous wave (FMCW) radar system and improving the value of the information provided the FMCW system. In an embodiment, the IF level is monitored while sweeping the frequency of the system through at least a portion of the frequency range of the system and the frequency is set to produce the minimum IF level. Embodiments expedite the adaptation of the comb filter to the signal when the system is turned on. In an embodiment, a method of quickly determining the largest peaks in the RDM is implemented. Embodiments relate to a method for processing a radar signal that classifies two or more targets. An embodiment classifies a human target or other target(s) using amplitude values in time-consecutive range-Doppler maps. An embodiment processes a radar signal for improving the performance of FMCW detection, tracking, and classification algorithms.

A global positioning system (GPS) receiver and method are provided for detecting a jammer signal using fast Fourier transform (FFT). A correlator correlates GPS signals received from GPS satellites with codes based on a plurality of carrier frequency signals having predetermined frequency offsets therebetween, and computes n correlated samples associated with each of the GPS satellites. A memory stores the n correlated samples associated with each of the GPS satellites and n FFT bins corresponding thereto. A FFT processor transforms the n correlated samples read from the memory using n-point FFT to obtain the n FFT bins, and transfers the n FFT bins to the memory. A peak detector detects largest peaks exceeding a lowered detection threshold from the FFT bins associated with each of the GPS satellites. A jammer detection unit makes a determination as to whether a peak relatively far away from other peaks is present among the largest peaks, and detects a signal of a peak far away from other peaks.

Large signal peaks (for example, peaks 105 and 110) can dramatically increase the cost of a communications device by requiring high grade power amplifiers. Peak reduction can reduce the large peaks at a cost of increasing spurious emissions. A circuit (for example, circuit 500) combining a scaling window peak reducing unit (for example, unit 507) and a filter (for example, filter 509) can effectively reduce the signal peaks without significantly increasing spurious emissions.

In a method for optimizing an ion detector a control voltage, such as in a mass spectrometry system, an array of mass scan data is acquired. Based on the size of the largest peak in the array or part of the array, a determination is made as to whether the current detector gain should be changed to a new detector gain. If the current detector gain should be changed, the control voltage for the subsequent mass scan is adjusted to a new control voltage corresponding to the new detector gain. The data are scaled based on the current detector gain. In another method, a gain versus control voltage curve is generated for calibration. These methods may be implemented by hardware, software, analog or digital circuitry, and / or computer-readable or signal-bearing media.

An image interpolating method and apparatus, in which horizontal and vertical Differences of Absolute Inter-channel Differences (DAIDs) are calculated from a color filter array (CFA) image, and an unknown pixel is interpolated in horizontal and vertical directions estimated in consideration of the DAIDs of R, G, and B pixels.Therefore, the image interpolating method and apparatus provide a large Peak Signal and Noise Ratio (PSNR), a Structural Similarity (SSIM), and high visual quality images.

Provided is an acoustic generator which has a high sound pressure at ultrahigh frequencies and which can suppress occurrence of large peak dips. An acoustic generator includes a film, a frame member disposed on an outer peripheral edge of the film, a piezoelectric element disposed on the film and inside the frame member, and a resin layer filled inside the frame member so as to cover the piezoelectric element.

The invention discloses an electrical stimulation platform system, method and storage medium used for determining the therapeutic mode, which improves the using convenience of the electrical stimulation therapy equipment. The invention adopts the technical proposal that the stimulus wave parameter and instruction are preinstalled according to the disease symptom of the experiment object; then theerror between the real stimulus wave and the preinstalled stimulus wave is automatically adjusted through the feedback of the response signal; finally, the preinstalled parameter and instruction of the stimulus wave are adjusted by means of electromyography; and the combination of the preinstalled stimulus wave and instruction corresponding to the disease symptom are stored. In the electrical stimulation platform system, more than 999 parameter combination can be online adjusted and stored; the selection between the impulse wave, the square wave, the triangular wave, the trapezoidal wave and the sawtooth wave with frequency from 1 to 1000Hz, duty cycle from 1 to 99% and largest peak voltage regulation range from 1 to 140VPP can be realized online. The electrical stimulation platform system can be used in the field to determine the therapeutic mode for corresponding electrical stimulation parameter.

The invention relates to a method for testing random vibration structure damage based on cross-correlation function peak value vector. It uses the relation between the frequency respond function of the cross-correlation function of the two points respond signal of the vibration structure and the structure out-exiting frequency spectrum to collect the respond signal of a period times of a plurality of measuring points, it dose cross-correlation function computing to one point respond signal with other points respond signals, it uses the largest peak of each cross-correlation function to construct the cross-correlation function peak value vector, it compares the relative factor of the intact structure and the current structure cross-correlation function peak value vector to quote weather the structure is damaged, it analyzes the content change of the corresponding elements to ascertain the damaged location.

Method and circuit for stabilizing the output power of a power amplifier, operated with signals having a large peak-to-average ratio and fed by a DC power supply with fluctuating output voltage. An allowable fluctuating range for the voltage output from the DC power supply and a constant voltage level are determined. A controllable voltage enhancement circuitry that can output an enhancement voltage is provided. The input of the voltage enhancement circuitry and a first DC supply path are connected to the output of the DC power supply. The output of the voltage enhancement circuitry is connected to a second DC supply path. While the instantaneous value of the fluctuating output voltage is lower than the constant voltage level, the voltage enhancement circuitry generates an enhancement voltage that causes the sum of the voltages supplied through the first and the second supply paths, to be identical to the constant voltage level.

An object of the invention is to improve the photosensitivity characteristics, characteristics on repeated use and stability of a photoreceptor. A photosensitive layer formed on a conductive support of a photoreceptor contains crystalline oxotitanylphthalocyanine having major peaks in an X-ray diffraction spectrum at Bragg angles (2theta±0.2°) of 7.3°, 9.4°, 9.6°, 11.6°, 13.3°, 17,9°, 24.1° and 27.2°, wherein a peak bundle formed by overlapping the peaks at 9.4° and 9.6° is the largest peak, and the peak at 27.2° is the secondary largest peak as a charge generating substance. Furthermore, it contains a bisamine compound, an N,N'-bisenamine compound, a styryl compound, an amine-hydrazone compound, a benzofuran-bishydrazone compound, a bisenamine compound, a benzofuran-bishydrazone compound or a benzofuran-bis-cyclic hydrazone compound represented by the particular structural formulae as a charge transporting substance.

The invention discloses a multiplexing modem of time orthogonal frequency-division, which relates to a modem device with restricted transmitting power, strong anti-frequency offset capability and the performance of resisting inter-symbol interference in the field of communication. The multiplexing modem of the invention comprises components such as a low-medium frequency modulator, a demodulator, an auxiliary multiplexer / demultiplexer, an intermediate frequency amplifier, a D / A converter, a low pass filter, a self-vibration module, a mixer, an adder, a band-pass filter and a power supply, etc.; by adopting TOFDM signals with quasi-constant envelop transmission, the modem of the invention realizes the performance of resisting the inter-symbol interference which is the same as that of the traditional OFDM technology, has the capability of collecting multipath, overcomes the problems of large peak-to-average power ratio and the bad capability of resisting frequency offset, and also realizes the purpose of the multiplexing modem of the time orthogonal frequency-division. The modem of the invention also has the advantages of high integration degree, small volume, light weight and good flexibility, etc. and is especially suitable for the field requiring for the modem with large-capacity wireless data transmission performance among strong multipath high-speed moving targets with seriously restricted power.

The invention relates to a time delay estimation method based on the Pattern delay coding underwater acoustic positioning. The method includes: determining corresponding relations of a signal form sending a Pattern signal, pulse time delay inequality and a location information code; establishing a duplicate signal corresponding to relevant operation; respectively intercepting a Pattern pulse in a received signal, and first time relevant operation is performed for a intercepted signal and the duplicate signal; a first time relevant operation result and a detection threshold value are compared, if in the first time relevant operation result, only one relevant peak value exceeds the detection threshold value, location information of a transponder is calculated according to the corresponding relations of time delay inequality of PLFM pulse relevant peaks and NLFM pulse relevant peaks, the pulse time delay inequality and the location information code, and otherwise, mutual relevant operation is performed for a first time relevant result of PLFM pulses and a first time relevant result of NLFM pulses, a largest peak value is found in the mutual relevant operation, and the location information of the transponder is calculated according to the largest peak value.

The invention discloses a low-peak-to-average-ratio wireless optical transmission method based on dynamic scalar regulation. The low-peak-to-average-ratio wireless optical transmission method based on dynamic scalar regulation comprises the steps that different scalar regulation coefficients are selected according to time domain peak values of all OFDM symbols, the symbols with extremely large peak values are compressed to a certain extent, in this way, the PAPR of signals of a whole frame is lowered, and therefore the transmission performance is improved; a user just needs to measure the average power of the received symbols at the receiving end so as to estimate the multiplied regulation coefficient, and the method is easy to realize; requirements of a system for power amplifiers and the degree of linearity of LED lamps are lowered due to the fact that the PAPR is lowered, nonlinear distortion of signals in an electric and optical domain is reduced, and the receiving performance of the system is improved; the direct-current bias needing to be added at the transmitting end is reduced due to the fact that the PAPR is lowered, and power consumption of the system is reduced.

Method and apparatus for communicating heterogeneous data traffic simultaneously using a hybrid Code Division Multiplexing (CDM) / Code Division Multiple Access (CDMA)-Time Division Multiplexing (TDM) / Time Division Multiple Access (TDMA) system which communicates data on a per data type basis, rather than a per user or per channel basis. A transmitter accepts a plurality of data streams, each of which includes either Constant Bit Rate Data (CBR) or Variable Burst Rate Data (VBR), where CBR is characterized by a steady data rate and strict latency requirements and VBR is characterized by a variable data rate with large peaks and lulls and loose latency requirements. The system identifies each input data stream as CBR or VBR. CBR data is spread using CDM / CDMA with an appropriate spreading factor for CBR, whereas VBR data is modulated / encoded and interleaved with CDM / CDMA with an appropriate spreading factor for VBR and TDM / TDMA, respectively. The modulated CBR data and VBR data streams are then transmitted by the transmitter to a receiver, which receives and demodulates the received data streams to recover the original CBR data and VBR data streams. By communicating input data streams based on whether they include CBR data or VBR data, the communication system is able to communicate CBR data and VBR data simultaneously while achieving a superior Quality-of-Service.

The invention relates to an FPGA (mixed random space voltage vector pulse width modulation method) and a modulator based on a field programmable gate array. According to the method, action time and pulse and pulse positioning of a basic voltage sector are controlled by two random variables, one of the two random variables is used for controlling the action time of the basic voltage vector by controlling distribution proportion of action time of two zero vectors, and the other random variable is used for performing pulse positioning by controlling the position of the widest high-level pulse. The modulator comprises a period register, a dead zone register, two groups of hop time registers, a counting and initial value reloading circuit, a register switching circuit and a pulse generation circuit, and an asymmetrical control pulse is generated through alternative comparison of the two groups of hop time registers. By the modulation method and the modulator, mechanical vibration, audio-frequency noise, electromagnetic radiation and the like due to a large peak value of a discrete set cluster spectrum are obviously avoided on the premise that fundamental wave voltage and switching frequency do not change.

A Doherty amplifier circuit is provided comprising at least three class E amplifiers (210) receiving separated amplitude (226) and phase information (224) from at least one signal source. At least one first impedance adjustment device is linked between the signal source and the inputs to at least two of the amplifiers, and a plurality of second impedance adjustment devices is linked to the outputs of the amplifiers to combine the outputs into an output of the circuit. In this way, a scheme for efficient amplification of amplitude modulated waveforms is achieved across a wide dynamic range and for a large peak-to-average ratio using only input modulated techniques.

The invention discloses an audio automatic gain control method and device. The method comprises the following steps: inputting audio signals to a programmable gain amplifier module and an ADC (Analogto Digital Conversion) module, then outputting audio signals to be processed to an error detection module, calculating the difference between the maximum of an amplitude absolute value of a current frame of audio data and a target amplitude peak, generating an error signal value err, processing the err in a loop back filter module to output an error signal value errout, processing the errout in again control module, comparing the absolute value of the errout and a preset error margin threshold errth to generate a gain control parameter, and feeding the gain control parameter back to a programmable gain amplifier, thus realizing automatic control on audio signal gain. The amplitude, which is too large or too small, of the input audio signals is adjusted to a standard range by automaticallycontrolling the gain thereof; and in face of large peak error, possible damped oscillation is eliminated by loop back filtration, so that the problem of fluctuation of audio signals is solved.

A method for improving depth for field (DOF) in microscopic imaging, the method comprising combining a sequence of images captured from different focal distances to form an all-focus image, comprising computing a focus measure at every pixel, finding the largest peaks at each position in the focus measure as multiple candidate values and blending the multiple candidates values according to the focus measure to determine the all-focus image.

The invention discloses a data hiding method based on an image set. The data hiding method comprises the step of carrying out anti-overflow process on an original carrier image, the step of developing a reserved pixel area, the step of generating a carrier image, the step of respectively carrying out subtraction on the carrier image and a basic image in the built image set to obtain difference images and histogram information, the step of regarding the difference image which has largest peak value of a histogram as a carrier and hiding data based on the information hiding method of the histogram, the step of hiding label information corresponding the difference image which has the largest peak value of the histogram and the difference image which has the lowest peak value of the histogram based on the reserved pixel area serving as the carrier, the step of adding a secret containing difference image and the corresponding image in the image set to obtain a secret containing image, the step of carrying out xor operation on the secret containing image and the basic image corresponding to the lowest histogram peak value to obtain a secret containing carrier image to be transmitted, and the step of extracting label information from the secret containing carrier image through a receiving terminal, carrying out the information hiding inverse process and recovering hidden data and hidden carrier images. The capacity of information hiding is improved through the image set, and safer lossless data hiding is achieved.

The invention relates to a multidimensional chromatography combination separation device, which comprises a pressurized capillary electrochromatography unit. The pressurized capillary electrochromatography unit comprises a mobile phase driving device, an injection valve, a capillary chromatographic column and a buffer solution bottle which are connected mutually and sequentially, a high-voltage power supply connected in parallel with the capillary chromatographic column, and a detector connected on the capillary chromatographic column. The separation device also comprises a capillary ion-exchange chromatography unit. The capillary ion-exchange chromatography unit comprises a mobile phase driving device, an injection valve and a capillary ion-exchange chromatography column which are connected mutually and sequentially. The capillary ion-exchange chromatography column is connected with an injection port of the injection valve of the pressurized capillary electrochromatography unit. The multidimensional chromatography combination separation device has the advantages of high separation efficiency, large peak capacity, small sample dosage, low raw material cost and low pollution, has more excellent peak capacity and separation capacity than the conventional one-dimensional chromatography, pressurized capillary electrochromatography, two-dimensional liquid chromatography and the like, and is more suitable for analysis of the complex sample.

The invention discloses a short-circuit protection circuit and method of a solid state electronic switch of a direct current micro-grid. The short-circuit protection circuit comprises an RC buffer branch circuit and an RD follow current branch circuit. The RC buffer branch circuit is connected to the solid state electronic switch in parallel, one end of a buffer capacitor Cs of the RC buffer branch circuit is connected with one end of a resistor Rs in series, the other end of the buffer capacitor Cs is connected to a collector of V1, and the other end of the resistor Rs is connected to an emitter of the V1. The RD follow current branch circuit is sequentially connected with a diode D1, a resistor R1, a diode D2 and a resistor R2 in series, the cathode of the diode D1 is connected to a positive busbar, the other end of the resistor R2 is connected to a negative busbar, and the cathode of the diode D2 is connected to the signal ground. By means of the short-circuit protection circuit and method of the solid state electronic switch of the direct current micro-grid, larger peak voltage at the two ends of the solid-circuit electronic switch occurring when the solid-circuit electronic switch is on or off can be prevented, impact of the short-circuit current on the solid state electronic switch is reduced, the faults of the monopole-to-ground short-circuit and the interelectrode short-circuit on the circuit can be cut off effectively, other power electronic devices on the circuit can be protected from being damaged, and the safety and reliability of the direct current micro-grid are improved.

The invention belongs to the field of thermoelectricity and relates to a thermal station system adopting a water-water heat exchanger, an electric heat pump and a heat storage system which are combined for usage. The basic component elements of the system include the water-water heat exchanger, the electric heat pump and the heat storage system. It can be achieved that primary grid return water temperature is lower than secondary grid return water temperature by adopting the water-water heat exchanger, the electric heat pump and step-by-step release of primary grid hot water heat. A heat storage device is added and adopts a heat storage mode and a heat release mode according to peak and valley electric charges of a power grid in different time periods. The electric heat pump is intermittently opened and closed, an intermittent operating mode is adopted, the operating cost of the system is reduced, and meanwhile lower primary grid return water temperature is ensured. Compared with a conventional thermal station, the primary grid return water temperature is remarkably reduced, the temperature difference of supplied water and return water is increased, accordingly the primary grid water heat supply capability is improved, and the heat storage device is added and has the positive effect on relieving of large peak and valley difference of electrical loads of the urban power grid during the day and night.

A method and an apparatus for detecting cracks in piezoelectric element. A method detects one or more cracks in a piezoelectric element interposed between a pair of electrodes and deforms according to a voltage applied thereto through the pair of electrodes. The method includes steps of applying a voltage at least at a resonance frequency of the piezoelectric element to the piezoelectric element through the pair of electrodes, measuring a dielectric tangent between the pair of electrodes under the applied voltage, and detecting if there are cracks in the piezoelectric element according to the measured dielectric tangent. The dielectric tangent of the piezoelectric element at the resonance frequency has a large peak or no peak depending on whether or not the piezoelectric element has cracks. Accordingly, the method easily and surely detects if the piezoelectric element has cracks according to the dielectric tangent of the piezoelectric element measured at the resonance frequency.

A method and apparatus for linear amplification of a modulated carrier signal or multi-carrier signal is disclosed. The linearity of the amplifier is improved by employing dynamic load line adjustments. A second current source coupled to the amplifier output load is turned on just before the amplifier reaches a nonlinear regime and reduces the effective load to prevent the amplifier allowing sufficient power to reach the nonlinear regime near saturation. The technique is particularly advantageous for amplification of a signal with large peak to average ratio.

The invention discloses a multi-rate peak clipping method and device. The multi-rate peak clipping method includes that a multi-rate peak clipping device uses a preset first speed rate peak clipping threshold and a preset first peak clipping coefficient to carry out primary digital peak clipping on a multi-carrier superposed signal after performing multi-carrier superposition; the multi-rate peak clipping device uses a preset second speed rate peak clipping threshold and a preset second peak clipping coefficient to carry out secondary digital peak clipping on an interpolated signal after performing signal interpolation. According to the embodiment, the multi-rate peak clipping mode is used for clipping signal peaks, the signal peak recurrence after interpolation can be avoided, the peak clipping effect is good, the peak clipping hardware resource can be saved, the peak clipping performance is improved, and the problems of large peak lifting, peak regeneration, signal quality degradation and the like after the multi-carrier superposition can be solved. The multi-rate peak clipping mode clips large-peak signals through low-speed peak clipping, and the peaks of the reserved small-peak signals are clipped in a high speed in subsequent.