separating a part of plot from an original fft plot

1 次查看（过去 30 天）

777 2012-3-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/31731-separating-a-part-of-plot-from-an-original-fft-plot

关闭： MATLAB Answer Bot 2021-8-20

i have a fft plot of an audio file over the range 0 to 3000hz. now i want to separate the 1000 to 2000 hz part of the plot into a diff variable. how to do that...?????

thanks in advance

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

此问题已关闭。

回答（1 个）

Tom 2012-3-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/31731-separating-a-part-of-plot-from-an-original-fft-plot#answer_40228

在 MATLAB Online 中打开

you can use the greater than/ less than symbols to do this: say your frequency data is stored as X, and your FFT data is stored as Y.

Z=Y(X>=1000 & X<=2000)

2 个评论
显示无隐藏无

777 2012-3-9

i had that in mind but the problem here is that fft is stored in a variable which is i dont think a function of frequency.

Dr. Seis 2012-3-9

If the the number of data points (N) is even, then:

Fs = 6000;

Nyquist = Fs/2; % i.e., 3000 Hz

df = Fs/N;

X = ifftshift(-Nyquist:df:Nyquist-df);

if N is odd:

X = [(0:df:Nyquist) -1*sort(df:df:Nyquist,'descend')]

此问题已关闭。

Community Treasure Hunt

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

Start Hunting!

Translated by