[78-L] World 1920s Records

[Steven C. Barr]

----- Original Message ----- 
From: "Jeff Lichtman" <jeff at swazoo.com>
>>Does anyone know the cordinnates formular to play the variable speed 1920s
>>World and Vocalion record recordings at the correct speed on the computer? 
>>I
>>would like to transfere some of the dance band tracks to CD. I've played
>>around with Adobe and Soundofrge with no luck so far.
>>
>>Jamie
> I don't know what you mean by "co-ordinates formula." Sound Forge has
> a pitch shifting tool (under the Effects menu select "Pitch" followed
> by the "Shift" sub-menu). You can set the number of cents by which to
> adjust the pitch - one cent is a hundredth of a semi-tone, or one
> twelve-hundredth of an octave.
>
BUT...these World (and some UK Vocalion) discs were cut at a constantly-
varying rotational speed! They were designed so the effective linear
velocity of the groove passing under the needle remained the same.
So...the first step would be to establish exactly what that linear velocity
WAS...the second would be how to match this varying linear velocity,
and the resultant constantly-varying rotational rate could be simulated...?!

Steven C. Barr