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<section id="SpectralNonstand">
  <title>Non-standard Spectral Processing</title>

  <para>
    These units generate and process non-standard signal data types, such as down-sampled time-domain control
signals and audio signals, and their frequency-domain (spectral) representations. The data types (<emphasis>d</emphasis>-, <emphasis>w</emphasis>-) are self-defining, and the contents are not processable by any other Csound units. These unit generators are experimental, and subject to change between releases, they will also be joined by others later.
  </para>

  <para>
    The opcodes for non-standard spectral processing are
    <link linkend="specaddm"><citetitle>specaddm</citetitle></link>,
    <link linkend="specdiff"><citetitle>specdiff</citetitle></link>,
    <link linkend="specdisp"><citetitle>specdisp</citetitle></link>,
    <link linkend="specfilt"><citetitle>specfilt</citetitle></link>,
    <link linkend="spechist"><citetitle>spechist</citetitle></link>,
    <link linkend="specptrk"><citetitle>specptrk</citetitle></link>,
    <link linkend="specscal"><citetitle>specscal</citetitle></link>,
    <link linkend="specsum"><citetitle>specsum</citetitle></link>, and
    <link linkend="spectrum"><citetitle>spectrum</citetitle></link>.
  </para>

</section>
