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