zero-crossing是什么意思

用法例句

The AVR singlechip is used for the core of controller,the automatic compensation optimum control method is established based on reactive power compensation principle,the problem of thyristor switched wrong trigger is solved by the technology of zero crossing triggering,switched vibration i.

采用AVR单片机系统作为控制器的核心,从无功补偿原理出发,建立了自动补偿最优控制方法,采用过零触发技术解决了晶闸管投切误触发的问题,减少了投切振荡,动态响应速度快。

In this article,the authors discuss how to implement the full automatic real time compensation of reactive power using several methods:a)applying "Power Trac" module,b)acguiring the system parameters,c)connecting/disconnecting the capacitors block based on the reactive power of the system by means of zero crossing triggering of SCR components.

应用 Power Trac模块 ,采集系统参数 ,根据系统的无功电流 ,通过可控硅元件过零触发技术 ,投入 /切除电容器组 ,以达到无功功率的全自动实时补

This method directly extracts the true back electromotive force(EMF) zero-crossing point by detecting the voltage difference between the floating phase terminal and the midpoint in the DC link.

为了实现无刷直流电机的无位置传感器控制,提出了一种新颖的转子位置信号检测方法,该方法通过比较逆变器直流环中点电压和电机断开相绕组端电压的关系,直接检测到断开相绕组反电动势的过零点,再将该过零点延迟30°电角度即可获得无刷直流电机绕组换相所必须的转子位置信号。

The zero-cross modulation technology uses exsisting power distribution network as transmition carrier.

过零调制技术完全利用现有电力网络为传输载体,无需额外增加系统设备,成本低廉。

In the paper,the theory of the wavelet analyse is used in the zero-cross modulation signal detection of the distribution power net.

将小波分析理论应用于配电网络过零调制信号的检测中,解决了在强噪声、低信噪比的配电网络中通信误码率高的难题,提高了系统的信噪比。

The characteristics of curve shapes have been extracted by using the zero crossing, and the correlation processing from coarse to fine is also carried out.

它是根据地质专家的经验，基于“由粗到细、分级控制”的概念，采用一类小波变换对测井信号进行多分辨率分析，利用其过零点提取曲线形态的特征，进而进行由粗到细的分级比对处理，实验结果良好。

Introduces a method to extract speech feature based on auditory model,the frequency information of the signal is obtained by zero crossing intervals,the intensity information of the signal is obtained by a peak detector and a compressive nonlinearty.

提出了一种基于听觉模型的语音特征提取方法 ,从信号的过零点获得频率信息 ,从振幅峰值和非线性压缩获得强度信息 ,并对这种方法进行了误差分析 ,证明其噪声的鲁棒性。