Teacher2Teacher |
Q&A #1864 |
From: jose
To: Teacher2Teacher Public Discussion
Date: 2008030418:48:44
Subject: Re: Piano notes
On 2002040520:56:26, Loyd wrote: >The octave on a piano is misnamed because all the keys are equal as >far as frequency is concerned. The A above middle C is 440 Hz. The >next key, (be it black or white) is 440 x 2^(1/12)=466.16 and the next >is the last key times x 2^(1/12 and so forth. > >2^(1/12)=1.059463094 so one can use that factor to find successive >notes. The key before A above middle C would be 440/(2^(1/12)). > >The scientific calculator is great for this since it permits raising a >number to a fractional power. > >By the way, there are 12 spaces in an octave and all are 1/12 octave >apart. One counts the spaces, not the keys. > >
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