zero crossing

In this paper, multi-parameters ( short-time energy, short-time zero-crossing rate and autocorrelation function values) combination has been adopted to judge the unvoiced/ voiced of speech signal. Then circular average magnitude difference function has been used to calculate pitch.

采用基于多参数组合方法（短时能量、短时过零率、自相关函数值）进行语音信号清浊音判别，利用循环平均幅度差函数进行基音周期计算。

The two-stage VAD algorithm is composed of Short Time Average Magnitude Difference Function and Short Time Zero Crossing Rate Function or Short Time Autocorrelation Function.

该算法第一级采用短时平均幅度差函数进行检测；在短时平均过零率可以有效检测的时候，第二级采用短时平均过零率进行检测，整个算法只有加减运算，简单易行；

Furthermore, the control units have zero crossing triggering circuit and adopt a novel structure of SCR in parallel with contactor to solve the problem of on-state power loss in SCR.

此外，智能控制单元采用过零触发方式开通晶闸管，并应用先进的晶闸管和接触器并联的机电一体结构，较好地解决了单纯采用晶闸管结构而引起的通态损耗。

Short-time logarithm energy with a constant has be used in the place of short-time energy of classical arithmetic in this article. The quotient and product of short-time energy and short-time zcr ( zero crossing rate) are basic parameters of the arithmetic.

本文以带常数的对数短时能量代替传统的短时能量，以短时过零率、短时能量之商、积作为端点检测算法中参量。

Based on traditional attenuation factor method, the short-term energy and the short-term zero crossing rate of the speech signal is used to dynamically revise the mixing factor in the proposed method.

该算法在传统的混音衰减因子法的基础上，采用短时能量及短时过零率对混音的衰减因子进行动态修正。

AC control is a normal application for triacs and SCRs because the turnoff time is decreased when the device is switched off during a zero-crossing.

由于器件在过零时被关断会降低关断时间，所以双向晶闸管和SCR通常用于交流控制。

Based on acoustic characteristics of cough, using the short time zero crossing ratio ( ZCR) identifies the suspicious coughs in order to get the threshold of short time energy.

利用过零率来定位可疑咳嗽，从而确定能量阈值。

A zero-crossing derivative spectrophotometry method is established for the determination of ofloxacin in ofloxacin glucose injection.

用零交导数分光光度法测定氧氟沙星葡萄糖注射液中氧氟沙星的含量.

Then by considering the factors of time gate, energy, phase and zero crossing point, etc.

在此基础上,综合考虑时窗 、 相位 、 能量和过零点等多种因素,成功地切除了初至波.

And it searches much further for the unvoiced frame according to the ZCR ( zero crossing rate), which is differ from unvoiced frame to background frame.

根据背景音和静音过零率的不同，进一步搜索符合要求的静音帧；

Research on Method of Iris Recognition Based on Zero-Crossing Detection

基于过零点检测的虹膜识别算法研究

Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.

传统的条码识别方法是通过二阶导数零交叉来定位条码边界.

Abstract: Zero-crossing edge detection method was analyzed.

文摘: 讨论二阶导数过零边缘检测方法.