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170 lines
5.6 KiB
170 lines
5.6 KiB
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<H2><A ID="SECTION0011101000000000000000">
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Fixed, noninterpolating delay line</A>
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</H2>
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<P>
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Example G01.delay.pd (Figure <A HREF="#fig07.23">7.23</A>) applies a simple delay line to
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an input signal. Two new objects are needed:
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<P>
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<DIV ALIGN="CENTER"><A ID="fig07.23"></A><A ID="8194"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 7.23:</STRONG>
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Example patch G01.delay.pd, showing a noninterpolating delay with
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a delay time controlled in milliseconds.</CAPTION>
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<TR><TD><IMG
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WIDTH="242" HEIGHT="312" BORDER="0"
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SRC="img818.png"
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ALT="\begin{figure}\psfig{file=figs/fig07.23.ps}\end{figure}"></TD></TR>
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</TABLE>
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</DIV>
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<P>
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<BR><!-- MATH
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$\fbox{ \texttt{delwrite\~}}$
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-->
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<IMG
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WIDTH="94" HEIGHT="39" ALIGN="MIDDLE" BORDER="0"
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SRC="img819.png"
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ALT="\fbox{ \texttt{delwrite\~}}">:
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<A ID="8424"></A>define and write to a delay line. The first creation argument gives the name of the
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delay line (and two delay lines may not share the same name). The
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second creation argument is the length of the delay line in milliseconds. The
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inlet takes an audio signal and writes it continuously into the delay line.
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<P>
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<BR><!-- MATH
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$\fbox{ \texttt{delread\~}}$
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-->
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<IMG
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WIDTH="86" HEIGHT="39" ALIGN="MIDDLE" BORDER="0"
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SRC="img821.png"
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ALT="\fbox{ \texttt{delread\~}}">:
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<A ID="8425"></A>read from (or "tap") a delay line. The first creation argument gives the name
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of the delay line (which should agree with the name of the corresponding
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<TT>delwrite~</TT> object; this is how Pd knows which <TT>delwrite~</TT> to
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associate with the <TT>delread~</TT> object). The
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second (optional) creation argument gives the delay time in milliseconds. This
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may not be negative and also may not exceed the length of the delay line as
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specified to the <TT>delwrite~</TT> object. Incoming numbers (messages) may be
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used to change the delay time dynamically. However, this will make a discontinuous
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change in the output, which should therefore be muted if the delay time changes.
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<P>
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The example simply pairs one <TT>delwrite~</TT> and one <TT>delread~</TT> object
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to make a simple, noninterpolating delay. The input signal is a looped
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recording. The delayed and the non-delayed signal are added to make a
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non-recirculating comb filter. At delay times below about 10 milliseconds, the
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filtering effect is most prominent, and above that, a discrete echo becomes
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audible. There is no muting protection on the delay output, so clicks are
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possible when the delay time changes.
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Miller Puckette
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2006-12-30
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