[sdiy] Wave table interpolation

[Tim Ressel]

Hi,

Another fun one. I've been looking at the WaveEdit software. It looks 
like it produces waves that are 256 samples by 16 bits. Obviously you'll 
want to interpolate between the samples. Linear interpolation works and 
is cheap but is brute force and causes lots of distortion. I've looked 
at cubic interpolation. Is that a viable approach? My app needs 4 tables 
live at a time so I can interpolate (linearly) between them, so this all 
has to happen on the fly. Cubic looks a bit math intensive.

Thanks!

-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com