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<span class="refentrytitle">specsum</span>
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<p>specsum —
Sums the magnitudes across all channels of the spectrum.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
Sums the magnitudes across all channels of the spectrum.
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<h2>Syntax</h2>
<pre class="synopsis">ksum <span class="command"><strong>specsum</strong></span> wsig [, interp]</pre>
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>interp</em></span> (optional, default-0) -- if non-zero, interpolate the output signal (<span class="emphasis"><em>koct </em></span>or <span class="emphasis"><em>ksum</em></span>). The default value is 0 (repeat the signal value between changes).
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>ksum</em></span> -- the output signal.
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<p>
<span class="emphasis"><em>wsig</em></span> -- the input spectrum.
</p>
<p>
Sums the magnitudes across all channels of the spectrum. At each new frame of <span class="emphasis"><em>wsig</em></span>, the magnitudes are summed and released as a scalar <span class="emphasis"><em>ksum</em></span> signal. Between frames, the output is either repeated or interpolated at the k-rate. This unit produces a k-signal summation of the magnitudes present in the spectral data, and is thereby a running measure of its moment-to-moment overall strength.
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<h2>Examples</h2>
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<pre class="programlisting">
ksum <span class="opc">specsum</span> wsig, 1 <span class="comment">; sum the spec bins, and ksmooth</span>
<span class="octrl">if</span> ksum <span class="op"><</span> 2000 <span class="octrl">kgoto</span> <span class="olabel">zero</span> <span class="comment">; if sufficient amplitude</span>
koct <span class="opc">specptrk</span> wsig <span class="comment">; pitch-track the signal</span>
<span class="octrl">kgoto</span> <span class="olabel">contin</span>
<span class="olabel">zero:</span>
koct <span class="op">=</span> 0 <span class="comment">; else output zero</span>
<span class="olabel">contin:</span></pre>
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<h2>See Also</h2>
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<a class="link" href="specdisp.html" title="specdisp"><em class="citetitle">specdisp</em></a>
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