Calculate only fraction of spectrum with FFT

2 次查看（过去 30 天）
T
T 2017-4-11
回答： Darshan Ramakant Bhat 2017-4-19
I have a signal with 4096 samples. I can calculate the frequency spectrum of this signal with fft. But I am only interested in a small fraction of the spectrum of about 40 specific frequency samples. Because I need to do this many many times, I need to get this as fast as possible. Any way? I tried to manually calculate the spectrum for those 40 samples, but fft is still faster. Thanks

请先登录，再回答此问题。

回答（1 个）

Darshan Ramakant Bhat
MATLAB uses built-in multi threading for the fft command. So it will over-perform any user defined code for calculating fft points,even if one calculate for smaller number of points. You can also make your custom fft code faster by using parallel computing tool box. Following doc explains about it
https://www.mathworks.com/discovery/matlab-multicore.html
Regards,
Darshan Bhat

类别

在 Help Center 和 File Exchange 中查找有关 Fourier Analysis and Filtering 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