ZCR

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。

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The stability against playback speed modification of ZCR ( zero-crossing rate) of audio signal is confirmed by theoretical analysis and experiments.

分析并通过实验验证了音频信号的过零率对回放速度修改这种去同步攻击的稳定性。

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The algorithm is robust about noise, rotation and so on. And it has strong security and uniqueness. ( 2) Based on the perceptual hashing of the speech ZCR ( zero-crossing rate) and speech centroid, a speech content authentication algorithm is proposed.

算法对旋转、噪声是鲁棒的，同时也具有较强的安全性与唯一性。（2）根据语音过零率及质心特征，设计了一种基于感知哈希的语音内容认证算法。

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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；

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Then, the short time energy is combined with short time ZCR to implement the endpoint detection of cough in continuous speech.

在此基础上，将短时能量和过零率用于连续语音流中咳嗽信号的端点检测，具有较好的鲁棒性。

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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。

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