[linux-audio-dev] Final Scratch, custom kernel?

[J.F.Quackenbush]

On Mon, 7 Oct 2002, Steve Harris wrote:

> On Mon, Oct 07, 2002 at 09:08:03 +0200, Thomas Grill wrote:
> > > The final scratch plates have time info encoded in the signal.  Not that
> > > I know much about it, but I'd imagine that was, in fact, the only thing
> > > encoded in the signal; can't think of much use for anything else.
> >
> > Well i guess encoding absolute time should not be too hard.
> > A simple solution could be to have the two stereo channels with different
> > frequencies, with the ratio corresponding to the radial position.
> > Or is that not accurate enough?
> I think stereo is an encoding on records, you might not be able to encode
> that.
>
> You could do it with two mixed signals though, a saw and sin of the same
> aplitude. The sin could start at just higher frequency than the saws
> fundamental and end fairly high, then you can just do frequency extraction
> to find the position.
>
> Maybe you could use a Grey Coding technique to determine position and
> speed in one. Or data recorded in a 8bit computer loading noise type way.

records include stereo information by having different sounds on each wall
of the groove. It seems like teh easiest solution would be to just write
SMPTE LTC to one side and something like word clock or black burst on the
other.

<relurk>

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