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GUI 音频信号处理

于 2022-07-09 发布 文件大小:287.03 kB
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1、信号频率、幅值和相位估计(1)频率(周期)检测对周期信号来说,可以用时域波形分析来确定信号的周期,也就是计算相邻的两个信号波峰的时间差、或过零点的时间差。这里采用过零点(ti)的时间差T(周期)。频率即为f = 1/T,由于能够求得多个T值(ti有多个),故采用它们的平均值作为周期的估计值。(2)幅值检测在一个周期内,求出信号最大值ymax与最小值ymin的差的一半,即A = (ymax - ymin)/2,同样,也会求出多个A值,但第1个A值对应的ymax和ymin不是在一个周期内搜索得到的,故以除第1个以外的A值的平均作为幅值的估计值。(3)相位检测采用过零法,即通过判断与同频零相位信号过零点时刻,计算其时间差,然后换成相应的相位差。φ=2π(1-ti/T),{x}表示x的小数部分,同样,以φ的平均值作为相位的估计值。

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