They say in the comments and documentation that it is implemented using a "Direct Form II Transposed" realization.
But for FIR filters (i.e. when a = 1) I suspect it uses an fft() to do the convolution in the frequency domain when it is faster to do so.
This would make sense because the procedure operates on a batch of data, not a sequential stream.
I don't suppose it really matters if the result is the same. I was just wondering if anybody knew for sure (for sizing and timing reasons).
hello,
you can see edit filter in matlab and you will understund the difference.
if a = 1, in this case you are using a fir filter
Hugh Lachlan Kennedy My implementation is attached and it's equivalent to use 'y = filter(B,1,x)' in MATLAB, where B is your FIR coefficients. I've tested it with some actual data and all results are the same.
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