[sc-users] audio v midi control - re Buffer to Signal

[Dan Stowell]

Well it depends on whether you're looking for on/off fluctuations at
"audio rate" or at "MIDI rate", surely? If you're getting on/offs at
the kind of rates that CDs read data (many thousands of kilobits per
second) then you definitely need it to be audio. But it wouldn't be
"sound if there is light and no sound if there is no light" - it'd be
"high value if there is light and low value if there is no light", and
the overall result would be sound. Hopefully.

But if you've carved the CDs in such a way that you get a few dozen
on/offs per second then MIDI's probably the easiest way to get it into
the computer. (You could also use a USB-based ADC?)

Dan

2006/8/31, simon blackmore <simon at simonblackmore.net>:
> Hi List,
>
> I have been working on a hacked CD drive project that reads the light
> through deteriorated
> disks rather than data. At the moment it sends midi information... A
> note on if there is
> light and a note off if there is no light.
>
> It occurred to me that it might be better to program a
> microcontroller to just send audio from the disk rather
> than midi information.
>
> For example:  sound if there is light and no sound if there is no light.
>
> I was thinking that in this case it would have the following
> advantages over midi.
>
> 1.  I could use all of the exisiting Classes and Ugens for analysing
> the signal.
> 2.  It would be faster than midi.
> 3.  Audio is time - with midi I would have to calculate it
> 4.  Cuts out USB - Midi devices
>
> But then I thought that it may have the following disadvantages
>
> 1.  It may take up more resources
> 2.  There is no standard to follow so I would need to make it up.
> 3.  You would need a multi channel sound card if you wanted to record
> sound too..
>
>
> I would be interested if anyone has given this idea of an audio
> controller any thought or knows of
> any projects using something similar.
>
>
> Thanks
>
> Simon
>
>
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