digital silence transitions with AUTimePitch format converter
digital silence transitions with AUTimePitch format converter
- Subject: digital silence transitions with AUTimePitch format converter
- From: Brian Whitman <email@hidden>
- Date: Sat, 8 Apr 2006 12:36:30 -0400
(Sorry for all the mails recently)
Say we have an AUGraph that looks like
ScheduledSoundPlayer -> aufc/tmpt -> DefaultOutput
We load in PCM regions from files, schedule them with the
ScheduledSoundPlayer, and start the graph. Assume for now the aufc/
tmpt rate is set at 1.0 (no stretch.)
For most music files, this works fine.
But, we have some test files that were synthetically created-- a drum
sound alone every second, for example, with 0s inbetween. We are
hearing a very loud "pop" right as each drum sound started that is
not in the original file. It appears to come at the transition
between digital silence to signal. This is with the aufc/tmpt AU
active but with a rate of 1.0.
if I add noise to the synthetic sound (i.e. in matlab: y = y + rand
(size(y))*0.001) the pops go away.
If I play the original files (no noise) in a graph without the aufc/
tmpt unit there is no pop.
-brian
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