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Re: How many half-tones from 78 rpm to 80 rpm

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Mon, 24 Apr 2017 17:54:49 -0400

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 ```Hi, Maddie, I started out with the ratio, 80/78 = 1.02564102564103 ~= 43.11 cents 78/76 = 1.02631578947368 ~=44.24 cents and 35/33 = 1.06060606060606 ~= 102 cents It is the ratio that is important, not the absolute step. Cheers, Richard On 2017-04-24 5:04 PM, Maddie Dietrich wrote: > So, is there a separate logarithmic relationship accounting for...um, I > guess the rpm to pitch, but also accounting for what the rpm is. Easier to > give an example: > > Say the pitch difference (the resulting interval in pitch) between 78 rpm > to 80 rpm is 44 cents. > > Is the pitch difference between 76 to 78 *corrected* also 44 cents? Or would it be > less? or more? My hunch is that it would be less. And between say 70 and 72 > even less. But between 80 and 82 would be a bit more than 44 cents. And > between 90 and 92 even more. Or maybe it's the opposite? > > Stated more simply, the lower the in rpm, the smaller the pitch interval > resulting from a constant differential (say, 2 rpms), and the higher the > rpm, the larger the interval. > > Or maybe the opposite? Or maybe it's a constant? Am I saying this right? > -- Richard L. Hess email: [log in to unmask] Aurora, Ontario, Canada 647 479 2800 http://www.richardhess.com/tape/contact.htm Quality tape transfers -- even from hard-to-play tapes. ```