HI All,  I am using a pwlf to generate a LONG analog waveform.   I'd like to send those samples through a bit of a "reconstruction filter" to get rid of any spectral artifacts from the PWL operation.  

This filter would have to be pretty sharp though for my application - with little phase distortion...  What I need is an Brick Wall element OR... the ability to have the PWL interpolate with a SINC function or something like that.

Any ideas on how this might be done well?

Thanks!!