[78-L] Gradual pitch shifting, was Pitch shifting

[David Lennick]

Steven C. Barr wrote:
> ----- Original Message ----- 
> From: "Doug Pomeroy" <pomeroyaudio at att.net>
>> Joe Salerno responded by suggesting the DCart (Diamond
>> Cut Audio Restoration Tools) software is capable of doing this.
>> I have had no hands-on experience with DCart, so I can't
>> comment, but I would question whether the quality could be
>> very good if the rage of necessary correction was very large.
>>
> Well, the range would logically vary according to pi * groove diameter;
> the groove diameter varies from a bit less than 10 inches, to pi * inner
> groove diameter (around 3.5 inches?). Since the groove spirals inward
> at a fixed rate, the rotational speed (and thus the pitch) will also change
> at a fixed rate, I would assume?!
> 
> Steven C. Barr

More..the discs I've seen (in the photo, the one I own and the one transferred 
by Norman Field) have been twelve-inchers.

And pi are round. Corn bread are square. Somebody had to say it.

dl