| 1. | Scr zero crossing triggering pulse output
Scr可控硅过零触发脉冲输出 |
| 2. | Scr zero crossing - trigger pulse output
Scr可控硅过零触发脉冲输出 |
| 3. | 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 |
| 4. | 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。 |
| 5. | 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。 |
| 6. | 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 |
| 7. | 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。 |
| 8. | 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。 |
| 9. | 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。 |
| 10. | 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。 |
