[sdiy] db to semitones, octaves.

[John L Marshall]

Two different things:

dB is a relative unit of measure (ratio) of amplitude, acoustic pressure, voltage, current, power, and so on. A 2:1 power ratio is 3dB. A 2:1 voltage ratio is 6dB.

semitones, octaves are a relative measure of frequency in Hertz of cycles per second. One octave has a frequency ratio of 2:1 or 1:2. One semitone has a frequency ratio of 1.059463... in equal temperament or 16:15 in just intonation

If you were to observe a waveform on an oscilloscope, the amplitude would be observed on the vertical axis and the frequency would be observed on the horizontal axis.

Take care,
John
  ----- Original Message ----- 
  From: Roman 
  To: karl dalen 
  Cc: synth-diy at dropmix.xs4all.nl 
  Sent: Wednesday, May 26, 2004 1:03 AM
  Subject: Re: [sdiy] db to semitones, octaves.


  db or dB like decibels?

  1 octave means times-two, what in dB equals 6.0206dB, 1 semitone is about 0.5dB

  1 dB = 1.993 semitone



  Roman

    ---- Wiadomość Oryginalna ----
    Od: karl dalen 
    Do: synth-diy at dropmix.xs4all.nl
    Data: Wed, 26 May 2004 04:16:25 +0200 (CEST)
    Temat: [sdiy] db to semitones, octaves.


    Hi!

    Is there any chart or table for converting db
    values into span of semitones, or octaves?

    Is there any formula for this?

    KD.  
    Höstrusk och grĺ moln - köp en resa till solen pĺ Yahoo! Resor


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