zero cross造句
例句与造句
- Scr zero crossing triggering pulse output
Scr可控硅过零触发脉冲输出 - Scr zero crossing - trigger pulse output
Scr可控硅过零触发脉冲输出 - A novel method of zero cross for 3d biomedical image edge detection
一种基于边缘检测的跳频检测算法研究 - This paper uses " virtual neutral point method " to measure the " zero crossing " , then the soft deal " zero crossing " to get the six key position to commutate
本文采用虚拟中点的方法来识别反电势过零点，然后对过零点进行处理得到无刷电机换向的六个关键位置。 - Bar code recognition is a matter of edge detection , which has long been done through the maximum value of the first derivative or zero crossing of the second derivative
条码识别是一个边缘检测问题。长期以来，边缘检测都是通过一阶导数极大值或二阶导数零交叉进行的。 - It's difficult to find zero cross in a sentence. 用zero cross造句挺难的
- Abstract : the performances and characteristiss of the zero crossing digital demodulation is ana lysed through the comparison of various ways of fsk signal digital demodulation . and ideal conclusion is reached
文摘:对各种频移键控信号的数字解调方法进行了研究和比较，并重点分析了零交点数字解调法的性能特征，最后得出了一个最佳结论 - Then one of the methods of rotor position detection - bemf zero crossing point detection is explained in detail . in succession , the chapter dissertates the method of measuring phase voltage and supply voltage , and analyses the error of rotor position using this method
对转子位置检测方法中的反电势过零点法作了比较详细的介绍，讨论了反电势法中相电压和端电压的检测方法，并分析了利用该方法时而产生的转子位置检测误差。 - The system uses the microchip pic16f877 made by microchip co . ltd as a control chip . it fulfills the capture of " zero crossing " point and the multifarious protective functions . it realize the approximately exact commutation of the motor and unmanned supervision of the system
本系统是以microchip公司生产的pic16f877为核心芯片，软硬件结合完成对反电势过零点的捕捉和系统的各种保护，实现了电机较为准确的换向和无人监控安全运行。 - 4 . the hardware of electronic control system is developed . it includes display module whose tasks are man - machine interaction , displaying humidity and temperature , setting humidity , time , date and week , communicating with computer ; power device module which provides power of all modules and drives control equipments to accomplish intention of main control module and can provide zero crossing protection circuit , excess voltage and under voltage protection circuit and excess current protection circuit ; water sensor group , the responsibilities of which are testing the states of water and send the states to scm , then the scm control the water level after judging the states
开发并实现了电控系统的硬件部分，包括显示模块：主要负责人机交互，显示湿度、温度，修改湿度、时间、日期、星期，和主控模块通讯；电源驱动模块：主要提供各个模块的电源，驱动被控设备，实现主控模块的意图，并能实现继电器的过零保护，过流、过压、欠压保护；水位传感器组：负责测知水位的状态，并把此状态送入单片机，单片机经过判断、处理反过来控制水位，实现水位的闭环控制。 - The initial vsd process uses two main characters , the average instantaneous energy and the average instantaneous zero crossing rate ( zcr ) . to make the first recognition for the start and the end , the emphasis of which is to select the appropriate value of the threshold and the length of frame . in the final vsd process , the author compares several characters and confirms the new recognition character
初步分段过程使用了能量和过零率这两个主要特征进行端点检测，重点是合理选择两个重要参数? ?门限和统计帧长度的取值；在最终分段过程中，笔者首先通过比较几种特征的识别效果，选择卡尔曼滤波参数作为再次分段的识别特征，还提出了一种新的识别特征? ?周期性缓变特征，使用这两个特征分别在子语音段内进行端点检测。 - In this chapter , the method of bldcm rotor position detection is first discussed . then the principle and algorithm of bemf zero crossing point detection is explained . in succession , the chapter dissertates the software realization of the bemf zero crossing point detection algorithm , the software disturbance filter and the modification of phase displacement , and the software realization of commutation point
在这一章中，先简述了无刷直流电机的转子位置器检测方法；然后论述了反电动势过零检测原理和算法以及该算法的软件实现、软件滤波和相移修正、换相点的软件实现；最后对软件开环换相起动策略作了详细论述。 - High - frequency link power converters are receiving increasing attention . when the input frequency of ac - ac converter is quite high , such as 20khz or above , in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage , the switching cycle becomes discrete pulse spectrums , however , the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria
当交-交变频器的输入频率非常高，通常为20khz时，为了在零电压条件下实现逆变器开关管的通断，变换器的开关时刻必须选择在高频交流电压脉冲为零时，这意味着变换器开关时刻在时间轴上成为不连续的点，而常规的硬开关pwm变换器是将开关时刻选择在任意时刻。 - The chip jk3ce that is one of micro - controllers in motorola 68hc08 family is used as control unit in this system . the zero crossing point of the back emf can be obtained by comparing the terminal voltage with the virtual neutral point , then using the software of the system can figure out the commutation period . the electronic commutation replaces the mechanical commutation in this way
本系统采用的控制芯片为motorola系列单片机中的jk3ce ，反电势过零点可以通过比较电机端电压和虚拟中点电压来得到，将过零点信号送往单片机捕捉端口后由系统软件来确定换相时刻，这样就可以由电子换向装置替代机械换相装置，有利于提高系统运行的可靠性，并降低了系统维护的费用。 - Above all , this paper work on the principle of simulink . principle of block and model are explained during initialization and execution stage . then runge - kutta ( 4 , 5 ) formula which is a main numerical integration method of simulink and zero crossing detection function are analyzed
从构成模型的基本单元? ?模块入手，阐述其运行机理并对模型的执行阶段进行全过程分析，然后介绍simulink的主要数值积分方法? ?四?五阶变步长runge - kutta法的基本积分原理，以及simulink的拐点处理功能? ?过零点检测技术（ zerocrossingdetection ）的基本原理。