> i have been playing around with this orc and sco to produce some sound
> examples  and i've found something curious. when i ask for a sweep
> between 800hz and 150000hz there is a strange folding over of the
> sound.(starts to play backwards). I've found a number below 10000hz
> avoids this problem but I'm just a bit confused. 
> ;sweep.orc
> ;-------------------------------
> sr = 44100
> kr = 4410
> ksmps = 10
> nchnls = 1
> 
> instr 1

...

> ;sweep.sco
> ;-------------------------------
> f3 0 8192 7 -1 4096 1 4096 -1 ; -- triangle
> 
> i1              0          5          2.2      800        15000   
> 10          .5;c
> e


Complete guess, but intuition suggests somesortof foldover/aliasing
from kr=4410 or table size=8192.

Again, right off the top of my head, with no thought whatsoever.


les



---------------------------------------------------------------------
Les Rackl                                         rackl@math.utah.edu
                                      http://www.math.utah.edu/~rackl
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