r the index, the 
more dispersed the spectral energy &mdash; normally a brighter sound.
</p>

<table class="bordered">

<tr>
<td class="bluishb">carrier=1000, mod=100, index=1.0</td>
<td class="bluishb">carrier=1000, mod=100, index=2.0</td>
<td class="bluishb">carrier=1000, mod=100, index=3.0</td>
</tr>

<tr>
<td><img src="pix/fm10.png" alt="fm 1.0"></td>
<td><img src="pix/fm20.png" alt="fm 2.0"></td>
<td><img src="pix/fm30.png" alt="fm 3.0"></td>
</tr>

<tr>
<td>
<pre>
  J0(1.0) = 0.765 -&gt; 1.0 (*)
  J1(