用于 NOTCH 滤波器的 BiquadFilterNode.Q [英] BiquadFilterNode.Q for the NOTCH filter

问题描述

我找不到关于 BiquadFilterNode.Q 值在您设置 BiquadFilterNode.type 为 'notch'.实际上，陷波滤波器应该衰减一定频率范围内的信号，但 BiquadFilterNode.frequency 似乎控制频率范围的中心"和 Q 值据说可以控制频带的宽度".

I cannot find any documentation on how the BiquadFilterNode.Q value works if you set the BiquadFilterNode.type to be 'notch'. The notch filter should, in practice, attenuate signals within a range of frequencies, but BiquadFilterNode.frequency seems to control "the center of the range of frequencies" and the Q value is said to control "the width of the frequency band".

但是，没有关于将使用什么单位的信息.说，如果我想衰减频率在 300 Hz - 700 Hz 之间的信号，中心是 500 Hz，所以我将 frequency 设置为那个，但是 Q 的值是多少这个范围是正确的吗?

However, there is no info on what units would be used. Say, if I want to attenuate signals with frequencies between 300 Hz - 700 Hz, the center is 500 Hz so I set the frequency to be that, but what value of Q would be correct for this range?

推荐答案

从互联网上撤下这个但试试看:

Pulled this off the internet but try it out:

// fc = cutoff frequency
// f2 = upper cutoff frequency
// f1 = lower cutoff frequency 
Q = (f2 - f1) / fc;

关于 Q 因子的维基百科文章:Q Factor Wiki

Wikipedia article on Q factor: Q Factor Wiki

电子学习网站:质量系数计算器

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