<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-2">
<META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD>
<BODY bgColor=#ffffff>
<DIV>Two different things:</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>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</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>Take care,</DIV>
<DIV>John</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=modular@go2.pl href="mailto:modular@go2.pl">Roman</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=dalenkarl@yahoo.se
href="mailto:dalenkarl@yahoo.se">karl dalen</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=synth-diy@dropmix.xs4all.nl
href="mailto:synth-diy@dropmix.xs4all.nl">synth-diy@dropmix.xs4all.nl</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, May 26, 2004 1:03
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [sdiy] db to semitones,
octaves.</DIV>
<DIV><BR></DIV>
<P>db or dB like decibels?</P>
<P>1 octave means times-two, what
in dB equals 6.0206dB, 1 semitone is about 0.5dB</P>
<P>1 dB = 1.993 semitone</P>
<P> </P>
<P>Roman</P>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid"><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 13px; COLOR: black; FONT-FAMILY: Arial; font-decoration: none">----
Wiadomo¶æ Oryginalna ----<BR><B>Od:</B> karl dalen
<DALENKARL@YAHOO.SE><BR><B>Do:</B> <A
style="FONT-SIZE: 13px; COLOR: blue; FONT-FAMILY: Arial; TEXT-DECORATION: none"
href="mailto:synth-diy@dropmix.xs4all.nl"
target=_blank>synth-diy@dropmix.xs4all.nl</A><BR><B>Data:</B> Wed, 26 May
2004 04:16:25 +0200 (CEST)<BR><B>Temat:</B> [sdiy] db to semitones,
octaves.<BR></FONT><BR></SPAN>
<DIV>Hi!</DIV>
<DIV> </DIV>
<DIV>Is there any chart or table for converting db</DIV>
<DIV>values into span of semitones, or octaves?</DIV>
<DIV> </DIV>
<DIV>Is there any formula for this?</DIV>
<DIV> </DIV>
<DIV>KD. </DIV>
<P>Höstrusk och grå moln - köp en resa till solen på <A
href="http://se.docs.yahoo.com/travel/index.html">Yahoo!
Resor</A></P></BLOCKQUOTE><BR></BLOCKQUOTE>
<STYLE>BODY {
FONT-SIZE: 10pt; BACKGROUND: none transparent scroll repeat 0% 0%; FONT-FAMILY: arial,sans-serif
}
P {
MARGIN: 0px
}
</STYLE>
</BODY></HTML>