Re: Does the Varispeed Unit support multi channels in phase
Re: Does the Varispeed Unit support multi channels in phase
- Subject: Re: Does the Varispeed Unit support multi channels in phase
- From: pwicker <email@hidden>
- Date: Sun, 10 Oct 2004 13:13:12 +0200
On Oct 10, 2004, at 12:15 PM, Mark Gilbert wrote:
Folks.
Before I embark on a complex function, I wanted to see if anyone knew
if the AU Varispeed unit supports multiple channels in phase.
I want to use it as the basis of a multichannel scrub system, where a
wheel will be used to control the speed of playback of audio from
disk. The audio is potentially coming from lots of mono files, and I
am expecting the varispeed unit to call me for data more or less
quickly depending on the rate I specify for the in to out ratio. I
wil have to do some fancy work to support forwards backwards scrub
operation.
If I read you well, you want to apply the same pitch conversion to the
audio coming from a bunch of mono files. If you can build a multiple
non-interleaved channels AudioStreamBasicDescription from your multiple
mono sources then the AUVarispeed should do it. After all, it's just a
generalization of the non interleaved stereo case. Another approach
could be to instantiate a dedicated AUVarispeed for each mono source.
Also, do you know if changes to the ratio will cause any clicking or
audio disruption. Since we are likely to be changing the rate quite
alot, this is another important question.
While experimenting the AUVarispeed I didn't notice any clicks or audio
drops. The pitch (the PlaybackCents parameter) was modified with a
little arrow control (one click giving 100 cent up or down). I'm not
the fastest mouse clicker in the west so this testing may have not been
very stressing, but no problem so far :))
Philippe
Any advice on the Varispeed unit would be appreciated.
Thanks
MarK Gilbert.
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