How to find frequencies of noise to filter

11 次查看（过去 30 天）
Dhanushka Palipana
Dhanushka Palipana 2020-5-20
回答： Sai Sri Pathuri 2020-5-26
I want to remove noisy frequencies from a data signal. But, I'm not sure the frequencies of the noise.
I tried fft, but the signal is very single sided, so can't read the specific frequencies from the graph we obtain from the following.
x = Data(:,2)
y = fft(x);
n = length(x); % number of samples
f = (0:n-1)*(fs/n); % frequency range
power = abs(y).^2/n; % power of the DFT
How do we find the specific frequencies of noise from a signal?

请先登录，再回答此问题。

回答（1 个）

Sai Sri Pathuri
Sai Sri Pathuri 2020-5-26
You may not require the frequency of noise to remove it from the signal. If you know the frequency of the signal, you may use the one of the following filters in documentation to remove the noise.
https://www.mathworks.com/help/signal/filter-design.html

类别

在 Help Center 和 File Exchange 中查找有关 Filter Banks 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by