[78-L] 45 to 78 in semi-tones - help! I need a math major!

[Christopher Steward]

You need to raise the original by 9.5 semitones. I arrived at that practically, and used a stroboscope to check speeds, so I think that gives 78.26, if I remember correctly. (The theory is easy - in theory. A semitone rise means multiplying the original frequency by 1.0594631, which is the 12th root of 2, i.e. dividing the octave into 12 semitones. To be more precise involves finding the 100th root of 1.0594631 for each cent - no thanks.)
Chris

--- On Wed, 29/7/09, Rodger Holtin <rjh334578 at yahoo.com> wrote:


From: Rodger Holtin <rjh334578 at yahoo.com>
Subject: [78-L] 45 to 78 in semi-tones - help! I need a math major!
To: "78-List" <78-l at 78online.com>
Date: Wednesday, 29 July, 2009, 4:08 AM


I'm using Nero as my digital editor and just recently discovered how to change some speeds.  For instance, my first discovery was that I recorded a 3 3/4 tape played at 7 1/2 and could cut the speeding tape back down to the right pitch and speed by cutting it by 12 semi-tones.  Now I need to figure out how to play a bouncy bent aluminum-base "acetate" 78 at 45 and use the semi-tones thingy to speed it back up correctly.
Any thoughts out there??

Rodger



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