On Sat, May 11, 2002 at 03:59:32 -0400, Likai Liu wrote: > linear interpolation is good for most purposes, however, if you're > really concerned about quality, a second order spline interpolation > (with quadratic formula) sound like a good idea. I know that "sox" has a > more complicated resampling formula that works well with uniform noise too.
I disagee, I would say that cubic interpolation is the minimum acceptable quality for audio, and where practical you should be using windowed sinc for resampling. Linear interpolation causes harmonic noise at -40dB (or there abouts), which is quite audible. JOS's resampling pages have more information on this. - Steve
