清空筛选条件
清空筛选条件

Moving Average filter window size automatically up-scaled by 1

2 次查看（过去 30 天）
Varun Gupta
Varun Gupta 2020-7-22
评论： Deepak Gupta 2020-7-23
I implemented a moving average filter using the 'FilterDesigner' with the following features (image attached)
I Specified the window size to be 15. (also created other instances of this filter with window sizes 5,10 and 13)
The group delay for MA is calculated by the formula (N-1)/2 but my group delay curve is plotting N/2 instead. (image attached)
where 'N' is the window size.
Does Matlab automatically upscales the window length by +1? i.e
[(15+1)-1] / 2 = 7.5 instead of 15-1/2 = 7

请先登录，再回答此问题。

采纳的回答

Deepak Gupta
Deepak Gupta 2020-7-22
Hi Varun,
In filterDesigner, you have mentioned filter order as 15 and filter taps or length of filter is order+1. The N generally mentioned in literature is number of taps(filter length), hence N = order+1 = 16.
I hope this clarifies your doubt.
Cheers,
Deepak
  4 个评论
显示 2更早的评论
Varun Gupta
Varun Gupta 2020-7-22
Sir,
If you can, please help me with one more conecern.
I desinged a Moving average filter with all the above properties except,
filter order = 6
and 'scale passband' selected.
My data's last 5 fields are -> 34.2700, 34.2700, 34.2700, 34.2800, 34.2800
Simple Moving Average output SHOULD BE = 34.274 by (adding all above/5)
But, I'm getting = 34.2716
Do you know, why?
Thanks.
Deepak Gupta
Deepak Gupta 2020-7-23
As your filter order is 6 hence number of filter taps = 6+1 = 7. You need to look at last 7 samples.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Filter Analysis 的更多信息

标签

产品


版本

R2020a

Community Treasure Hunt

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

Start Hunting!

Translated by