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

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Mon, 24 Apr 2017 16:34:01 -0400

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 ```Hi, Ben, I put 80/78 = 1.02564102564103 in as "Pitch Factor" in Samplitude and it gave me 0.44 half steps (semitones) and the length is 97.5% of the original length. Please use a RESAMPLE algorithm, not one of the algorithms that changes pitch without changing time. To confirm, I put in a Pitch Factor of 2 and it did indeed tell me 12 half steps (semitones). As you know, the semitone is the pitch difference between any two adjacent piano keys: A A# B C C# D D# E F F# G G# A And you see 12 spaces = semitones. This begs the issue of "temperament" where the pitch differences aren't quite equal and the details of that are beyond way beyond what I know...I only know it exists and that there are varying versions. The interval multiplier is 2^(1/12) or 1.0594763 With this you should be able to adapt/calculate anything. If you calculate 0.02564/0.059476 the result is 0.4312 (which I assumed Samplitude didn't properly round but "ceiling'd." A quarter tone is very noticeable to musicians. Another measure of pitch is "cents." Google just came up with this quick explanation: "Cents. Musical intervals are often expressed in cents, a unit of pitch based upon the equal tempered octave such that one equal tempered semitone is equal to 100 cents. An octave is then 1200ยข and the other equal tempered intervals can be obtained by adding semitones: If f1 = Hz and f2 = Hz then the interval is cents." http://hyperphysics.phy-astr.gsu.edu/hbase/Music/cents.html This link has a calculator and other links including "temperament." It also claims that 5 cents is the just noticeable difference in pitch. Therefore the change of 0.44 semitones or 44 cents is about nine times the just noticeable difference and clearly worth doing. Cheers, Richard On 2017-04-24 3:30 PM, James Roth wrote: > Hello everybody, > > Can anyone tell me how many half-tones up from 78 rpm to 80 rpm? > > Thanks. > Ben Roth > -- 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. ```