Total energy in Time and Frequency Dimain

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Maria Amr
Maria Amr 2020 年 12 月 12 日
コメント済み: Star Strider 2020 年 12 月 14 日
I truly appreciated if somebody can direct me how to measure total energy in a certain frequency band?
I have a signal and use this code to measure total enery and the result is reasonable.
E1_timedomain=sum(abs(x.^2))
but it measuers total energy of whole signal. I just want to measure it between [0-100] Hz. Appreciared!

採用された回答

Star Strider
Star Strider 2020 年 12 月 12 日
If you have R2018a or later, and the Signal Processing Toolbox, use the bandpass function to selectively filter the frequencies-of-interest. Then do whatever calculations you want to do on the output. If you have an earlier version, it is easy to design filters in MATLAB. I will help you with that, if necessary.
  2 件のコメント
Maria Amr
Maria Amr 2020 年 12 月 12 日
Star Strider Thank you so much.
As usual, the best and the fast way.BIG like!
Star Strider
Star Strider 2020 年 12 月 12 日
As always, my pleasure!

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その他の回答 (2 件)

Maria Amr
Maria Amr 2020 年 12 月 14 日
Star Strider I have applied a bandpass filter and get a reasonable result. Would you please direct me how may I retrive the filtered signal? Appreciated!
that is my code:
bandpass(amp1,[1 78],fs);
  1 件のコメント
Star Strider
Star Strider 2020 年 12 月 14 日
You need to use an output:
filtered_signal = bandpass(amp1,[1 78],fs);

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Maria Amr
Maria Amr 2020 年 12 月 14 日
Star Strider Appreciated!
  1 件のコメント
Star Strider
Star Strider 2020 年 12 月 14 日
As always, my pleaure!
(Also, in the future please post comments as Comments, not Answers.)

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