How to remove multiple evenly spaced frequency components from digital signal

6 次查看（过去 30 天）

Fan Yang 2021-11-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1586784-how-to-remove-multiple-evenly-spaced-frequency-components-from-digital-signal

评论： Mathieu NOE 2021-11-15

Hey guy,

the FFT of my acustic signal returned some evenly spaced back group noisey frequencies 3,6,9,12,15hz. To remove them at once, I beliebe I can use a irrnotch or irrcomb. But the example of both functions only demonstrated how to remove a signal frequency component, which is a 60hz notch. I am wondering how can I remove multiple evenly spaced frequency components at once.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Mathieu NOE 2021-11-15

hello

iircomb will do the job for multiple frequencies - read again the help . yes it will remove the 60 hz tone plus all harmonics

example is given for 11 notches = 60 Hz tone + 10 harmonics will be removed

Design and plot an IIR notch filter with 11 notches (equal to filter order plus 1) that removes a 60 Hz tone (f0) from a signal at 600 Hz(fs). For this example, set the Q factor for the filter to 35 and use it to specify the filter bandwidth.

fs = 600;

fo = 60;

q = 35;

bw = (fo/(fs/2))/q;

[b,a] = iircomb(fs/fo,bw,'notch'); % Note type flag 'notch'

请先登录，再进行评论。

请先登录，再回答此问题。