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sfstoolbox / sfs-matlab

SFS Toolbox for Matlab/Octave
https://sfs-matlab.readthedocs.io
MIT License
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use persistent variables to speed up resampling filter #131

Closed fietew closed 7 years ago

fietew commented 7 years ago

MATLAB's profiler told me, that the design of the resampling filter which is done in firpm for each delayline call takes at lot of time. This fix caches the filter coefficients in a persistent variable.

fietew commented 7 years ago

The function uses normalised frequencies as an input (so between 0.0 and 1.0, while 1.0 corresponds to fs/2). Wpass and Wstop are taken from the fdatool (filter design tool) of MATLAB.