improved definition of a semitone

Author: danielweck

css3-speech/Overview.html

@@ -2245,10 +2245,15 @@ <h3 id=voice-props-voice-pitch><span class=secno>10.3. </span>The &lsquo;<a
     <p> Specifies a relative change (decrement or increment) to the inherited
      value. The syntax of allowed values is a &lt;<a
      href="#number-def">number</a>&gt; followed immediately by "st"
-     (semitones). A semitone is half of a tone (a half step) on the standard
-     diatonic scale. As such, a semitone doesn't correspond to a fixed
-     frequency: the ratio between two consecutive frequencies separated by
-     exactly one semitone is the twelfth root of two (approximately 1.05946).</p>
+     (semitones). A semitone interval corresponds to the step between each
+     note on a equal temperament chromatic scale. A semitone can therefore be
+     quantified as the difference between two consecutive pitch frequencies
+     on such scale. The ratio between two consecutive frequencies separated
+     by exactly one semitone is the twelfth root of two (approximately
+     1.05946). As a result, the value in Hertz corresponding to a semitone
+     offset is relative to the initial frequency the offset is applied to (in
+     other words, a semitone doesn't correspond to a fixed numerical value in
+     Hertz).</p>
 
    <dt> <strong>&lt;percentage&gt;</strong>
 
@@ -2388,10 +2393,15 @@ <h3 id=voice-props-voice-range><span class=secno>10.4. </span>The &lsquo;<a
     <p> Specifies a relative change (decrement or increment) to the inherited
      value. The syntax of allowed values is a &lt;<a
      href="#number-def">number</a>&gt; followed immediately by "st"
-     (semitones). A semitone is half of a tone (a half step) on the standard
-     diatonic scale. As such, a semitone doesn't correspond to a fixed
-     frequency: the ratio between two consecutive frequencies separated by
-     exactly one semitone is the twelfth root of two (approximately 1.05946).</p>
+     (semitones). A semitone interval corresponds to the step between each
+     note on a equal temperament chromatic scale. A semitone can therefore be
+     quantified as the difference between two consecutive pitch frequencies
+     on such scale. The ratio between two consecutive frequencies separated
+     by exactly one semitone is the twelfth root of two (approximately
+     1.05946). As a result, the value in Hertz corresponding to a semitone
+     offset is relative to the initial frequency the offset is applied to (in
+     other words, a semitone doesn't correspond to a fixed numerical value in
+     Hertz).</p>
 
    <dt> <strong>&lt;percentage&gt;</strong>
 

css3-speech/Overview.src.html

@@ -1789,10 +1789,13 @@ <h3 id="voice-props-voice-pitch">The 'voice-pitch' property</h3>
       <dd>
         <p> Specifies a relative change (decrement or increment) to the inherited value. The syntax
           of allowed values is a &lt;<a href="#number-def">number</a>&gt; followed immediately by
-          "st" (semitones). A semitone is half of a tone (a half step) on the standard diatonic
-          scale. As such, a semitone doesn't correspond to a fixed frequency: the ratio between two
-          consecutive frequencies separated by exactly one semitone is the twelfth root of two
-          (approximately 1.05946).</p>
+          "st" (semitones). A semitone interval corresponds to the step between each note on a equal
+          temperament chromatic scale. A semitone can therefore be quantified as the difference
+          between two consecutive pitch frequencies on such scale. The ratio between two consecutive
+          frequencies separated by exactly one semitone is the twelfth root of two (approximately
+          1.05946). As a result, the value in Hertz corresponding to a semitone offset is relative
+          to the initial frequency the offset is applied to (in other words, a semitone doesn't
+          correspond to a fixed numerical value in Hertz). </p>
       </dd>
       <dt>
         <strong>&lt;percentage&gt;</strong>
@@ -1926,10 +1929,13 @@ <h3 id="voice-props-voice-range">The 'voice-range' property</h3>
       <dd>
         <p> Specifies a relative change (decrement or increment) to the inherited value. The syntax
           of allowed values is a &lt;<a href="#number-def">number</a>&gt; followed immediately by
-          "st" (semitones). A semitone is half of a tone (a half step) on the standard diatonic
-          scale. As such, a semitone doesn't correspond to a fixed frequency: the ratio between two
-          consecutive frequencies separated by exactly one semitone is the twelfth root of two
-          (approximately 1.05946).</p>
+          "st" (semitones). A semitone interval corresponds to the step between each note on a equal
+          temperament chromatic scale. A semitone can therefore be quantified as the difference
+          between two consecutive pitch frequencies on such scale. The ratio between two consecutive
+          frequencies separated by exactly one semitone is the twelfth root of two (approximately
+          1.05946). As a result, the value in Hertz corresponding to a semitone offset is relative
+          to the initial frequency the offset is applied to (in other words, a semitone doesn't
+          correspond to a fixed numerical value in Hertz).</p>
       </dd>
       <dt>
         <strong>&lt;percentage&gt;</strong>