## ARSCLIST@LISTSERV.LOC.GOV

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

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Mon, 24 Apr 2017 21:56:21 +0000

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 ```No, it's not a constant difference for every 2 rpm. It's a constant difference if the percentage of change is the same. Gary -----Original Message----- From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Maddie Dietrich Sent: Monday, April 24, 2017 5:07 PM To: [log in to unmask] Subject: Re: [ARSCLIST] How many half-tones from 78 rpm to 80 rpm crap. In my example I meant to say between 76 and 78. (a constant difference of 2 rpm) On Mon, Apr 24, 2017 at 5:04 PM, Maddie Dietrich <[log in to unmask]> 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 80 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? > > -- Madeline Dietrich 414-687-8744 ```