I was thinking about this the other day.... is it possible to have aliasing with Karplus-Strong? Because it's a delay line, nothing is being played back at any higher rate than it was sampled at, so no aliasing should be possible. Right? Math-gurus correct me if I'm wrong.
Otherwise, any signal generator needs to be bandlimited or oversampled:
http://en.flossmanuals.net/PureData/Antialiasing http://en.flossmanuals.net/PureData/GeneratingWaveforms
Frank Barknecht has some spliced-transition trick he uses as well, I'm sure it will come up in a reply or two on this thread as well...
D.
On 3/31/10 6:27 PM, Pierre Massat wrote:
Hi!
I ve been reading the on-going debate about interpolation for a few days, and it just occured to me that i don't how go about avoiding aliasing more generally than with band-limited wavetables. If i wanted to play a sample at a pitch higher than the original, or if i wanted to use a karplus-strong resonator to generate notes, what would be the proper way of ensuring that no aliasing occurs? Do people generally use low-pass filters with a cut-off somewhere below the Nyquist frequency? Or is there a trick that one can use earlier on in the signal path of a patch?