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+<!--Converted with LaTeX2HTML 2002-2-1 (1.71)
+original version by:  Nikos Drakos, CBLU, University of Leeds
+* revised and updated by:  Marcus Hennecke, Ross Moore, Herb Swan
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+<TITLE>Signals to controls</TITLE>
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+<H2><A NAME="SECTION007104000000000000000">
+Signals to controls</A>
+</H2>
+
+<P>
+Example C06.signal.to.control.pd (not pictured) demonstrates conversion from audio signals back to numeric
+control streams, via a new tilde object introduced here.
+
+<P>
+<BR><!-- MATH
+ $\fbox{ $\mathrm{snapshot}\sim$}$
+ -->
+<IMG
+ WIDTH="97" HEIGHT="41" ALIGN="MIDDLE" BORDER="0"
+ SRC="img348.png"
+ ALT="\fbox{ $\mathrm{snapshot}\sim$}">:
+<A NAME="3849"></A>convert audio signal to control messages.  This always gives the most recently
+computed audio sample (fast-as-possible conversion), so the exact sampling
+time varies by up to one audio block.
+
+<P>
+It is frequently desirable to sense the audio signal's amplitude rather than
+peek at a single sample; Example C07.envelope.follower.pd (also not pictured) introduces another
+object which does this:
+
+<P>
+<BR><!-- MATH
+ $\fbox{ $\mathrm{env}\sim$}$
+ -->
+<IMG
+ WIDTH="60" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
+ SRC="img349.png"
+ ALT="\fbox{ $\mathrm{env}\sim$}">:
+<A NAME="3850"></A>RMS envelope follower.  Outputs control messages giving the short-term RMS
+amplitude (in decibels) of the incoming audio signal.  A creation argument allows
+you to select the number of samples used in the RMS computation; smaller numbers
+give faster (and possibly less stable) output.
+
+<P>
+<BR><HR>
+<ADDRESS>
+Miller Puckette
+2006-12-30
+</ADDRESS>
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