文件名称:zero_crossings
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计算过零点的数量从提供的时域输入向量。一个简单的方法是用在这里，可以很容易移植到实时系统中。-Count the number of zero-crossings from the supplied time-domain
input vector. A simple method is applied here that can be easily
ported to a real-time system.
input vector. A simple method is applied here that can be easily
ported to a real-time system.
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zero_crossings.m