Total energy in Time and Frequency Dimain

Question

Maria Amr 2020-12-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/692015-total-energy-in-time-and-frequency-dimain

评论： Star Strider 2020-12-14

采纳的回答： Star Strider

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!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2020-12-12

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/692015-total-energy-in-time-and-frequency-dimain#answer_573565

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 个评论
显示无隐藏无

Maria Amr 2020-12-12

Star Strider Thank you so much.

As usual, the best and the fast way.BIG like!

Star Strider 2020-12-12

As always, my pleasure!

请先登录，再进行评论。

Answer 2

Maria Amr 2020-12-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/692015-total-energy-in-time-and-frequency-dimain#answer_574760

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);