38 results about "Peak value" patented technology

The invention discloses a hybrid image compressing method based on block classification. In the invention, blocks are divided into text/ image block, natural image block and hybrid block according to different features of text/image area and natural image area of original images in the aspect of color and texture; then a compression mode in which palette coding, Hextile coding and LZW coding are combined is used in the text/ image block, a JPEG lossy compression mode is used in the natural image while the algorithm of the combination of the two modes is used in the hybrid block. The invention has the advantages that based on the block classification method, the text/image area and the natural image area can be divided up accurately, and that the blocks are respectively encoded can keep rather acuminate edge of the text/image block so as to enhance visual effect on the basis of ensuring higher compression efficiency and upgrade the peak signal to noise ratio of reconstructed images; the complexity of the algorithm is lower.

An OFDM receiver includes an offset compensator (14) compensating for a frequency offset in a received OFDM signal. The offset compensator (14) includes a memory (51) storing two reference signals corresponding to arbitrary portions in the start symbol of the OFDM signal. A cross correlation value between the received OFDM signal and each of the two reference signals is calculated by a cross correlator (52, 53). Each peak position is detected by a peak detector (54). A frequency offset estimate value of the received OFDM signal is estimated by a frequency offset estimation circuit (55) based on the cross correlation value at each detected peak position. A phase rotation circuit (37) compensates for the frequency offset of the received OFDM signal based on the estimated frequency offset estimate value.

The invention provides a compressor torque compensation method and apparatus, and an air conditioner. The method comprises the following steps: obtaining a motor rotation speed estimation value omega est; according to a motor rotation speed fluctuation value omega mrip, obtaining a peak torque compensation amount Tp; according to a motor rotation speed instruction value omega ref and the omega est, obtaining a speed regulation peak torque instruction T0; according to the Tp and the T0, obtaining a total peak torque instruction Tt; according to an AC input voltage phase theta g, obtaining a waveform variable Wf, modulating the Tt by use of the Wf to obtain a torque instruction Tref after modulation; according to the Tref and a motor torque coefficient Kt, obtaining a current instruction Iqref of a Q shaft; according to Idref, the Iqref, Id and Iq, obtaining a voltage instruction Vd of a D shaft and a voltage instruction of Vq of the Q shaft; and after performing coordinate transformation on the Vd and the Vq, outputting the transformed Vd and Vq to a motor so as to drive a compressor. According to the invention, fluctuations of the rotation speed of the compressor can be effectively inhibited.

There is provided an AGC circuit that has a very small offset voltage and is easy for integration, without using any of external capacities. For that reason, a variable gain amplifying circuit (GCA1) which has a gain controlled by a gain control signal, and whose output DC offset is controlled by an offset compensation signal, an A/D conversion circuit (AD1) for A/D converting an output signal of this variable gain amplifying circuit (GCA1), a level detection circuit (Det1) for performing peak detection of an output signal of this A/D conversion circuit (AD1) to thereby detect an amplitude level, a gain control circuit (Gctrl1) for outputting a gain control signal according to an output signal of this level detection circuit (Det1), an offset detection circuit (Det2) provided with a lowpass filter for taking out a DC component from the output signal of the A/D conversion circuit (AD1), and a D/A conversion circuit (DA1) for D/A converting an output signal of the offset detection circuit (Det2) to thereby output the offset compensation signal are provided.

A method for producing a polymer piezoelectric film, comprising: a process of moving and stretching a crystalline polar polymer sheet in contact with a conductive stretching roller having a diameter of at least 30 mm and a surface friction coefficient which has been reduced to such a level as to allow a relative displacement of the crystalline polar polymer sheet in contact with the conductive stretching roller: and a step in the process of applying a polarization voltage between an electrode disposed opposite to the crystalline polar polymer sheet and the conductive stretching roller to polarize the crystalline polar polymer sheet. As a result, it is possible to stably produce a polymer piezoelectric film exhibiting stable piezoelectricity over a large area. Especially, it is possible to obtain polymer piezoelectric film exhibiting a temperature-dispersion peak temperature of d₃₁ piezoelectricity coefficient at least 120° C. and surface scratches extending in one direction.

A laser device is comprised of multiple RF excited, diffusion-cooled slab-geometry laser-gain-channels all mounted in a radial-array configuration to provide a multi-channel laser system capable of both high average and peak laser output power, in a extremely small, lightweight and relatively low cost physical package, ideally suited to robotic applications. The concept utilizes a simple and effective methodology for multiple beamlet coupling and stacking which collectively yield a composite laser output beam of excellent efficiency, stability and optical quality.

The invention discloses an electrostatic type lampblack purifier lampblack monitoring cleaning system and a monitoring cleaning method. The electrostatic type lampblack purifier lampblack monitoring cleaning system comprises a purifier data collector arranged on a power supply circuit of an electrostatic type lampblack purifier and a fan data collector arranged on a fan, an analog-digital conversion unit, an industrial personal computer and a background server, wherein the analog-digital conversion unit is used for changing a current signal collected by the purifier data collector and the fan data collector into a digital signal so as to be sent to the industrial personal computer; the industrial personal computer is provided with a GPRS (general packet radio service) data transmitter module, the background server is provided with a GPRS data sending-receiving module, so that the data of the industrial personal computer is transferred to the background server so as to carry out real-time monitoring. The invention also discloses a lampblack monitoring cleaning method of the electrostatic type lampblack purifier. The purifier data collector collets an I practical peak value and an I practical valley value in each interval setting time, and the industrial personal computer executes a sweeping task according to a setting algorithm.

A vibration damping apparatus including reference wave production section that produces a reference wave; a fundamental order adaptive algorithm block that calculates fundamental order adaptive filter factors from a vibration detection signal and the reference wave and produces a fundamental order vibration damping current instruction; an amplitude detection section that calculates a peak current value of the fundamental order vibration damping current instruction; and a fundamental order current excess detection section that derives a fundamental order current upper limit value from the fundamental frequency to produce a fundamental order current upper limit excess signal that is output to the fundamental order adaptive algorithm block, which revises the fundamental order adaptive filter factors in a direction in which the vibration damping current instruction is limited within a range.

A floating point arithmetic unit for embedded digital signal processing is provided with the ability of tracking the exponent portion of numerals using static analyzing technology efficiently and of low-power consumption. A fix adding unit with a simplified mantissa alignment device and simplified normalizing device arranged at the input end and output end, a fix multiplying unit with a simplified normalizing device arranged at the output end, and a shifter are included in the floating point arithmetic unit. A shift control method in accordance the floating point arithmetic unit is also provided to prevent overflow of the peak of the numerals. According the unit and the method, the effective precision of the arithmetic result is higher. The hardware configuration, power consumption and chip area are similar with fix point arithmetic units, while the precision is close to the floating point arithmetic units with complicated configuration.

In a method and apparatus for generating optimum write power, a control unit controls a write voltage generating unit to generate sequentially write voltages of different levels to drive an optical read/write head to generate different write powers so as to write data on a plurality of write intervals of an optical recording medium in sequence. Simultaneously, a detecting and computing circuit detects a peak value, a first level and a second level of a write reflected signal generated by each write interval for computation so as to obtain a first control parameter of each write interval, and detects a peak value, a bottom value and a direct current level of a read reflected signal generated during reading of each write interval for computation so as to obtain a second control parameter of each write interval, thereby generating an optimum write power based on optimal first and control parameters.

The invention particularly relates to a memristor-based automatic gain control circuit. The technical scheme is as follows: the circuit consists of a variable gain amplification module (1), a comparator (4) and a peak value detection module (5); the variable gain amplification module (1) consists of an operational amplifier circuit (2) and a memristor (3); a terminal M2 of the memristor (3) is connected with an input end Rc of the operational amplifier circuit (2); an input end Vi of the operational amplifier circuit (2) is externally connected with an input signal Vin; an output end VVGA of the operational amplifier circuit (2) is respectively connected with an input end VVGAP of the peak value detection module (5) and the input end Vw of a peripheral circuit; a terminal M1 of the memristor (3) is connected with an output end Vc of the comparator (4); an input end ViVGAP of the comparator (4) is connected with an output end ViVGA of the peak value detection module (5); and an input end VREF1 of the comparator (4) is externally connected with a reference electric level VREF. The memristor based automatic gain control circuit provided by the invention has the advantages of simple structure, low cost and high accuracy.

The invention relates to a nanosecond level pulse peak value detection method and belongs to the technical field of optical communication. According to the method, a nanosecond level pulse signal is broadened through a low-pass filter, then, a clock signal obtained after phase position adjustment is triggered, and therefore an analog-digital converter can sample data more accurately. Under the condition that a high-speed analog-digital converter is not needed, a nanosecond level pulse signal peak value can be detected. With the detection method, the requirement for the sampling rate of an analog-to-digital conversion unit can be lowered, the method is simple and easy to perform, and cost of the needed devices is low.

The invention relates to the field of signal processing, and specifically relates to a peak power determining method, a peak-to-average power ratio determining method, a peak power determining device, and a peak-to-average power ratio determining device. The peak power determining method comprises the following steps: getting the sampling power at the current sampling time; comparing the sampling power at the current sampling time with the estimated peak power at the current sampling time; and when the sampling power at the current sampling time is higher than the estimated peak power at the current sampling time, determining the sampling power at the current sampling time as the actual peak power at the current sampling time. According to the invention, the efficiency of peak power detection is improved, and the peak power can be determined in real time at each sampling time.

The invention provides a method of communication parameter detection and a related device. The method and the related device are used for detecting the length of protection time intervals of message loops in communication signals. The method includes the steps of searching peak values in self-relevant signals of the communication signals, providing the peak values for the message loops, classifying time difference between the two adjacent peak values into one of a plurality of intervals of histogram statistics, deciding the length of the protection time intervals according to results of the histogram statistics, finding a peak value, providing a signal average according to an average in average value statistics of the self-relevant signals, comparing a ratio between the peak values and the signal average, and judging whether the ratio is larger than a critical value. Accordingly, whether effective information is carried in the communication signals can be detected.

The damage length measurement system has an object being measured that comprises a plurality of members is vibrated by an oscillator, and the vibration that propagates through the object being measured is detected by three sensors. A measurement apparatus analyzes that vibration wave, and measures the arrival time of the maximum peak. Using the fact that the time for a wave to propagate between two vibration detection sensors separated by a set interval is fixed, the measurement apparatus determines whether the difference in arrival time between two sensors is within a set reference range that includes the vibration propagation time between two vibration sensors. When the measurement apparatus determines that the difference is not within the set reference range, uses the fact that that wave is delayed compared to the wave that was to be detected.

The invention relates to the field of shock wave measurement methods and techniques, specifically to a comparison-type calibration method for shock wave measurement. The comparison-type calibration method comprises the following steps of: 1) clamping ballistic rifles with different calibers on a fixed shooting platform; 2) placing a calibrated noise measurement system and a shock wave measurement system to be calibrated at equal distance respectively from left and right sides of the ballistic rifles in the shooting direction; 3) conducting shooting via the ballistic rifles with different calibers, and simultaneously acquiring, in real time, shock waves generated by the calibrated noise measurement system and the shock wave measurement system to be calibrated during the ball firing; 4) performing statistics of acquired mass data, and figuring out a linear regression equation about a noise peak and a shock wave peak; and 5) correcting, by using the linear regression equation in the step (4), the shock wave pressure peak acquired after the measurement. The comparison-type calibration method of the invention comprehensively improves the shock wave measurement precision and solves the problem that there is no way to carry out field calibration for shock wave measurement.

The invention provides a device and a method for testing an APD measuring device. To accurately test the operating state of the APD measuring device, a test device (40) includes a test signal generator (41) that generates a test signal corresponding to the center frequency of a signal to be measured and a control unit (42) that variably controls the amplitude level of a test signal in the dynamic range of an APD measuring device (1) at random. If the test signal is input from the test device (40), the APD measuring device (1) outputs a PDF histogram manufactured according to counting of an amplitude peak value of the test signal during change of the amplitude level and a time capturing rate calculated based on the difference between the DPD data of the test signal and the referential APD data, as the test result representing a motion state.

The invention discloses an LED lamp constant-power constant-current time division multiplexing control method. The control method comprises a switch power supply, N paths of LED drivers, and LED lampsof N kinds of colors; the LED lamp of each color correspondingly provides a lamplight color; the LED lamp constant-power constant-current time division multiplexing control method comprises the implementation steps of determining the color types Y of the LED lamps which need to be driven to be lightened up; determining the total output current peak I<1> and the total output power P<1> of the LEDlamps of the Y kinds of colors in the step S1; improving the total output current peak I<2> of the LED lamps of the Y kinds of colors in the step S<2>, wherein at the current moment, the output current peak of the LED lamp of each color is I<2>/Y, and the output power of the LED lamp of each color is (X*P<1>)/Y; controlling the PWM duty ratio of the LED lamp of each color in the step S3 to be 1/Y;and enabling the conduction time of the LED lamp of each color in the step 4 to be staggered. By virtue of the control method, a beneficial effect that the power of the LED lamps in different color modes in mixed use can be constant and close to the total output power and the constant current is achieved.

The present invention relates to a method and a system for determining a cell ID in the NSSS synchronization process of an NB-IoT system. The method comprises the following steps: 1, acquiring an NSSSsequence according to an NPSS timing position, wherein the NSSS sequence includes multiple NSSS subsequences; 2, making four autocorrelation operations on two NSSS subsequences with a sliding interval of 1, and acquiring four energy peak values which correspond to different q values; 3, comparing the four energy peak values respectively, determining the maximum energy value of the four energy peak values, and obtaining the q value corresponding to the maximum energy value and the position of the maximum energy value in a time domain; 4, performing calculation according to the position in conjunction with a Fourier transform property to obtain a u value; and 5, performing calculation according to the q value and the u value to obtain a cell ID. The technical scheme of the invention can reduce the computational complexity in determining the cell ID and improve the synchronization efficiency of NSSS.

The invention provides a micro-discharge power dynamic tracking method. The micro-discharge power dynamic tracking method is characterized by comprising the following steps: 1) a peak power meter I and a peak power meter II are connected with a zero adjusting unit and an attenuator respectively; 2) the power of an input port of a to-be-tested part is calibrated; 3) the to-be-tested part is connected to a system of a micro-discharge detection test; and 4) in the process of the micro-discharge detection test, the output of a signal source or the top bottom level of a modulation unit is adjustedin time according to the relation between the average power and peak power read by the peak power meter I and the expected average power and peak power after calibration, so that the average power andthe peak power read by the peak power meter I are close to the expected average power and peak power after calibration. According to the dynamic tracking method, the average power and the peak powerof the zero adjusting unit and the attenuator of the micro-discharge testing system are dynamically tracked, and the outputs of the signal source and the modulation unit are adjusted, so that the accuracy, reliability and safety of the micro-discharge effect test are improved.

In a brushless motor having a stator including armature windings for a plurality of phases, and a rotor including a permanent magnet and being rotatably disposed inside or outside of the stator, an inter-phase induced voltage waveform between two different phases in the armature windings is a trapezoidal waveform formed by superimposing a fifth-order component and a seventh-order component on a first-order fundamental wave. A content rate X(=(α₅+α₇)/α₁) of a total of voltage peak values α5 and α7 of the fifth-order component and the seventh-order component to a voltage peak value α₁ of the first-order fundamental wave is preferably set to a range of 0.01≦X≦0.1, and more preferably to a range of 0.02≦X≦0.09.

The invention relates to a computer liquid cooling source heat dissipation control module. A base clamp slot is fixed at one end of a bottom of an outer side of a valve base. A valve plate inner cavity is set in the valve base. An intra-cavity slot is set at the center position of the valve plate inner cavity. An electromagnetic ring a and an electromagnetic b are set at left and right sides of the intra-cavity slot. The electromagnetic ring a and the electromagnetic b are connected with electrode wiring terminals. An air bag column is clamped and fixed at the central position between a valvebottom plate and a valve top plate. An iron sheet disk is placed in the valve top plate. According to the module, a direct current voltage range input by the electromagnetic ring a and the electromagnetic b is 3.6-12V. Input voltages can be linearly adjusted and controlled in real time. When the direct current voltages input by the electromagnetic ring a and the electromagnetic b are peak values,the space between the valve bottom plate and the valve top plate is the limit lowest space. The computer liquid cooling source heat dissipation control module is prepared.