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<section id="SigmodSample">
  <title>Sample Level Operators</title>

  <para>
    The opcodes one may use to modify signals are
    <link linkend="opa"><citetitle>a</citetitle></link>, 
    <link linkend="diff"><citetitle>diff</citetitle></link>, 
    <link linkend="downsamp"><citetitle>downsamp</citetitle></link>, 
    <link linkend="fold"><citetitle>fold</citetitle></link>, 
    <link linkend="opi"><citetitle>i</citetitle></link>, 
    <link linkend="integ"><citetitle>integ</citetitle></link>, 
    <link linkend="interp"><citetitle>interp</citetitle></link>, 
    <link linkend="ntrpol"><citetitle>ntrpol</citetitle></link>, 
    <link linkend="samphold"><citetitle>samphold</citetitle></link>, and
    <link linkend="upsamp"><citetitle>upsamp</citetitle></link>.
  </para>

</section>
