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113 lines
3.3 KiB
113 lines
3.3 KiB
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<H2><A ID="SECTION007104000000000000000">
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Signals to controls</A>
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</H2>
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<P>
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Example C06.signal.to.control.pd (not pictured) demonstrates conversion from audio signals back to numeric
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control streams, via a new tilde object introduced here.
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<P>
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<BR><!-- MATH
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$\fbox{ $\mathrm{snapshot}\sim$}$
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-->
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<IMG
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WIDTH="97" HEIGHT="41" ALIGN="MIDDLE" BORDER="0"
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SRC="img348.png"
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ALT="\fbox{ $\mathrm{snapshot}\sim$}">:
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<A ID="3849"></A>convert audio signal to control messages. This always gives the most recently
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computed audio sample (fast-as-possible conversion), so the exact sampling
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time varies by up to one audio block.
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<P>
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It is frequently desirable to sense the audio signal's amplitude rather than
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peek at a single sample; Example C07.envelope.follower.pd (also not pictured) introduces another
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object which does this:
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<P>
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<BR><!-- MATH
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$\fbox{ $\mathrm{env}\sim$}$
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-->
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WIDTH="60" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
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SRC="img349.png"
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ALT="\fbox{ $\mathrm{env}\sim$}">:
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<A ID="3850"></A>RMS envelope follower. Outputs control messages giving the short-term RMS
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amplitude (in decibels) of the incoming audio signal. A creation argument allows
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you to select the number of samples used in the RMS computation; smaller numbers
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give faster (and possibly less stable) output.
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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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