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108 lines
3.4 KiB
108 lines
3.4 KiB
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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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HREF="node117.html">Fixed, noninterpolating delay line</A>
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<H2><A ID="SECTION0011102000000000000000">
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Recirculating comb filter</A>
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</H2>
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<P>
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Example G02.delay.loop.pd (Figure <A HREF="#fig07.24">7.24</A>) shows how to make a recirculating delay
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network. The delay is again accomplished with a
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<TT>delwrite~</TT>/<TT>delread~</TT> pair. The output of the
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<TT>delread~</TT> object is multiplied by a feedback gain of 0.7 and fed into
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the <TT>delwrite~</TT> object. An input (supplied by the <TT>phasor~</TT> and
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associated objects) is added into the <TT>delwrite~</TT> input; this sum
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becomes the output of the network. This is the recirculating comb filter
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of Section <A HREF="node109.html#sect7.recirculatingcomb">7.4</A>.
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<P>
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<DIV ALIGN="CENTER"><A ID="fig07.24"></A><A ID="8208"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 7.24:</STRONG>
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Recirculating delay (still noninterpolating).</CAPTION>
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<TR><TD><IMG
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WIDTH="510" HEIGHT="291" BORDER="0"
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SRC="img823.png"
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ALT="\begin{figure}\psfig{file=figs/fig07.24.ps}\end{figure}"></TD></TR>
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</TABLE>
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</DIV>
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<P>
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The network of tilde objects does not have any cycles, in the sense of objects
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feeding either directly or indirectly (via connections through other objects)
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to themselves. The feedback in the network occurs implicitly between the
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<TT>delwrite~</TT>and <TT>delread~</TT> objects.
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<P>
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<BR><HR>
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<ADDRESS>
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Miller Puckette
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2006-12-30
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