Bandpower function produces same results for different bands

6 次查看（过去 30 天）
chels19
chels19 2016-7-12
评论： chels19 2016-7-13
I'm using the bandpower function with different frequency bands. However, the results from each band are the same. The code I'm using is:
avpow = bandpower(x, fs, [0.0 0.4])
HF = bandpower(x, fs, [0.15 0.4]) %high frequency
LF = bandpower(x, fs, [0.04 0.15]) %low frequency
VLF = bandpower(x, fs, [0.0033 0.04]) %very low frequency
Any help is greatly appreciated.

请先登录，再回答此问题。

回答（1 个）

Greg Dionne
Greg Dionne 2016-7-12
You might not be giving it enough data to resolve the lower frequencies. You generally will have a resolution on the order of fres = fs / length(x). Since your lowest frequency band ends at 0.04 Hz, make sure fres << 0.04 Hz.
  1 个评论
chels19
chels19 2016-7-13
Thanks. The frequency it was originally recorded at was 512. Should I be using 512 in my code as fs?
fres = 512 / length(x) returns 2.473
Or should I used the maximum frequency I'm looking for (0.4)?
fres = 0.4 / length(x) returns 0.00193

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Texas Instruments C2000 Processors 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