[PD] smallest possible value of a delay-time

vanDongen/Gilcher gml at xs4all.nl
Fri May 14 12:14:47 CEST 2004

What happens if you upsample the signal to a sample rate high enough so that 
you can do a single sample delay, and then downsample again?
There are various interpolation techniques for this I think, and you are not 
limited to lineair interpolation, which
 I suspect that this does work.Not sure if you can do it in pd though.

you should ask the music-dsp list, or the csound list. I think in csound they 
solved the tuning of the karplus-strong this way. But again I am not sure.



On Friday 14 May 2004 00:09, Roman Haefeli wrote:
> this discussion went up when we talked about the karplus-strong-sythesis.
> so it is not about getting this short delay in realtime. it is about a
> sythesis that tries to simulate string and other percussive instruments.
> the problem is, that the frequency of the sythesized sound is dependent
> from a delay-time (frequency=1/delaytime). if the quantization of the
> delaytime is 1 sample, you can't play any frequency you want with this
> sythesis (for example: you want freq of 5000. how many samples long is the
> delay: 44100 / 5000 = 8.82 samples delaytime > 8.82 truncated> 9. freq with
> 9 samples delay = 44100 / 9 = 4900 >>> you get an error size of 100Hz or
> 2%) .
> with your idea, it's maybe possible to play any frequency with
> karplus-strong-sythesis.

electronic & acoustic musics-- http://www.xs4all.nl/~gml

More information about the Pd-list mailing list