[PD] Pd sample rate and audio interface
ror20 at pitt.edu
Thu Mar 6 18:37:46 CET 2014
General (Pd-101?) question about how Pd talks to the audio interface for
sample rate agreement.
On my system - OS X 10.9, Komplete Audio 6 interface, pd vanilla 45.4 -
I can set Pd to a different sample rate from my interface, yet not
achieve the expected transpositions from having unmatching sample rates.
Within Pd, I have soundfiles recorded at 24, 44.1, 48, 88.2, 96, and 196
rates. When I set Pd to a sample rate other than the rate of the
recorded file, the playback transposes as expected from the differing
sample rates...i.e. the 44.1 file plays back at a higher frequency when
Pd is set to a sample rate > 44.1.
What I was expecting was that if I deliberately unmatch the sample rate
of my interface and Pd, that the sonic output would be similarly
transposed due to the sample rate in-equality. However, it seems that I
can set my interface to any sample rate, set Pd to any sample rate, and
the sonic output will be stable - a 440 osc~ will sound like a 440 osc~
- rather than transposed as stated in the Pd documentation section 2.4.1.
I get the same stable results when Pd is set to output via my iMac's
internal sound processor, too.
I was hoping to use the unmatching sample rates between software and
hardware as way of illustrating the necessity to have the sample rates
Thoughts, suggestions, or clarifications?
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