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need help getting started

KoglinKoglin Posts: 3
edited 2004-10-15 23:43 in BASIC Stamp
Im basically going to try and build a keyboard from scratch using some push buttons and a stamp for a project. The only problem im having is finding the·frequencies·I need for the notes of a keyboard anybody know where I can find them???

Comments

  • allanlane5allanlane5 Posts: 3,815
    edited 2004-10-15 20:12
    Concert 'A' is 440 Hz. Going up an octave doubles the frequency. I'm not sure what the frequency increment is between notes.
  • Tracy AllenTracy Allen Posts: 6,664
    edited 2004-10-15 23:43
    Here are the ratios for the 12 notes of the equal temperament scale:

    1.00000 Z0 the root note
    1.059463 Z1 ...
    1.122462 Z2 ...
    1.189287 Z3 ...
    1.259921 Z4 the ascending major third ~5/4
    1.334839 Z5 the ascending major fourth ~4/3
    1.414213 Z6 ...
    1.498306 Z7 the ascending major fifth ~3/2
    1.587400 Z8 ...
    1.681791 Z9 the ascending major sixth ~5/3
    1.781796 Z10 ...
    1.887747 Z11 ...
    2.000000 Z12 the octave 2/1


    I have a thing on how to generate a scale using the ** operator to approximate the powers of the number 1.059463 at this URL...

    www.emesystems.com/BS2math1.htm#musical

    If you Google, "musical scale", you will be edified. Here is one chart:
    hyperphysics.phy-astr.gsu.edu/hbase/music/et.html#c2

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Tracy Allen
    www.emesystems.com
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