add files from http://msp.ucsd.edu/techniques/latest/book-html.tgz
This commit is contained in:
203
node69.html
Normal file
203
node69.html
Normal file
@@ -0,0 +1,203 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
|
||||
|
||||
<!--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
|
||||
* with significant contributions from:
|
||||
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
|
||||
<HTML>
|
||||
<HEAD>
|
||||
<TITLE>ADSR envelope generator</TITLE>
|
||||
<META NAME="description" CONTENT="ADSR envelope generator">
|
||||
<META NAME="keywords" CONTENT="book">
|
||||
<META NAME="resource-type" CONTENT="document">
|
||||
<META NAME="distribution" CONTENT="global">
|
||||
|
||||
<META NAME="Generator" CONTENT="LaTeX2HTML v2002-2-1">
|
||||
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
|
||||
|
||||
<LINK REL="STYLESHEET" HREF="book.css">
|
||||
|
||||
<LINK REL="next" HREF="node70.html">
|
||||
<LINK REL="previous" HREF="node68.html">
|
||||
<LINK REL="up" HREF="node68.html">
|
||||
<LINK REL="next" HREF="node70.html">
|
||||
</HEAD>
|
||||
|
||||
<BODY >
|
||||
<!--Navigation Panel-->
|
||||
<A NAME="tex2html1576"
|
||||
HREF="node70.html">
|
||||
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/next.png"></A>
|
||||
<A NAME="tex2html1570"
|
||||
HREF="node68.html">
|
||||
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/up.png"></A>
|
||||
<A NAME="tex2html1564"
|
||||
HREF="node68.html">
|
||||
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/prev.png"></A>
|
||||
<A NAME="tex2html1572"
|
||||
HREF="node4.html">
|
||||
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/contents.png"></A>
|
||||
<A NAME="tex2html1574"
|
||||
HREF="node201.html">
|
||||
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/index.png"></A>
|
||||
<BR>
|
||||
<B> Next:</B> <A NAME="tex2html1577"
|
||||
HREF="node70.html">Transfer functions for amplitude</A>
|
||||
<B> Up:</B> <A NAME="tex2html1571"
|
||||
HREF="node68.html">Examples</A>
|
||||
<B> Previous:</B> <A NAME="tex2html1565"
|
||||
HREF="node68.html">Examples</A>
|
||||
<B> <A NAME="tex2html1573"
|
||||
HREF="node4.html">Contents</A></B>
|
||||
<B> <A NAME="tex2html1575"
|
||||
HREF="node201.html">Index</A></B>
|
||||
<BR>
|
||||
<BR>
|
||||
<!--End of Navigation Panel-->
|
||||
|
||||
<H2><A NAME="SECTION00881000000000000000">
|
||||
ADSR envelope generator</A>
|
||||
</H2>
|
||||
|
||||
<P>
|
||||
Example D01.envelope.gen.pd (Figure <A HREF="#fig04.12">4.12</A>) shows how the <TT>line~</TT> object may
|
||||
be used to generate an ADSR envelope to control a synthesis patch (only the
|
||||
ADSR envelope is shown in the figure). The ``attack" button, when pressed, has
|
||||
two effects. The first (leftmost in the figure) is to set the <TT>line~</TT> object on its attack segment, with a target of 10 (the peak amplitude) over 200
|
||||
msec (the attack time). Second, the attack button sets a <TT>delay 200</TT> object, so that after the attack segment is done, the decay segment can start.
|
||||
The decay segment falls to a target of 1 (the sustain level) after another 2500
|
||||
msec (the decay time).
|
||||
|
||||
<P>
|
||||
|
||||
<DIV ALIGN="CENTER"><A NAME="fig04.12"></A><A NAME="4744"></A>
|
||||
<TABLE>
|
||||
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4.12:</STRONG>
|
||||
Using a <TT>line~</TT> object to generate an
|
||||
ADSR envelope.</CAPTION>
|
||||
<TR><TD><IMG
|
||||
WIDTH="222" HEIGHT="229" BORDER="0"
|
||||
SRC="img379.png"
|
||||
ALT="\begin{figure}\psfig{file=figs/fig04.12.ps}\end{figure}"></TD></TR>
|
||||
</TABLE>
|
||||
</DIV>
|
||||
|
||||
<P>
|
||||
The ``release" button sends the same <TT>line~</TT> object back to zero over
|
||||
500 more milliseconds (the release time). Also, in case the
|
||||
<TT>delay 200</TT> object happens to be set at the moment the ``release" button is pressed, a
|
||||
``stop" message is sent to it. This prevents the ADSR generator from
|
||||
launching its decay segment after launching its release segment.
|
||||
|
||||
<P>
|
||||
In Example D02.adsr.pd (Figure <A HREF="#fig04.13">4.13</A>)
|
||||
we encapsulate the ADSR generator in a Pd abstraction
|
||||
(named <TT>adsr</TT>) so that it can easily be replicated. The design of the
|
||||
<TT>adsr</TT> abstraction makes it possible to control the five ADSR parameters
|
||||
either by supplying creation arguments or by connecting control streams to its
|
||||
inlets.
|
||||
|
||||
<P>
|
||||
|
||||
<DIV ALIGN="CENTER"><A NAME="fig04.13"></A><A NAME="4886"></A>
|
||||
<TABLE>
|
||||
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4.13:</STRONG>
|
||||
Invoking the <TT>adsr</TT> abstraction.</CAPTION>
|
||||
<TR><TD><IMG
|
||||
WIDTH="217" HEIGHT="153" BORDER="0"
|
||||
SRC="img380.png"
|
||||
ALT="\begin{figure}\psfig{file=figs/fig04.13.ps}\end{figure}"></TD></TR>
|
||||
</TABLE>
|
||||
</DIV>
|
||||
|
||||
<P>
|
||||
In this example the five creation arguments (1, 100, 200, 50, and 300) specify
|
||||
the peak level, attack time, decay time, sustain level (as a percentage of peak
|
||||
level), and release time. There are six control inlets: the first to trigger
|
||||
the ADSR generator, and the others to update the values of the five parameters.
|
||||
The output of the abstraction is an audio signal.
|
||||
|
||||
<P>
|
||||
This abstraction is realized as shown in Figure <A HREF="#fig04.14">4.14</A>. (You can open
|
||||
this subpatch by clicking on the <TT>adsr</TT> object in the patch.) The only
|
||||
signal objects are <TT>line~</TT> and <TT>outlet~</TT>. The three <TT>pack</TT> objects correspond to the three message objects from the earlier Figure
|
||||
<A HREF="#fig04.12">4.12</A>. From left to right, they take care of the attack, decay,
|
||||
and release segments.
|
||||
|
||||
<P>
|
||||
|
||||
<DIV ALIGN="CENTER"><A NAME="fig04.14"></A><A NAME="4887"></A>
|
||||
<TABLE>
|
||||
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4.14:</STRONG>
|
||||
Inside the <TT>adsr</TT> abstraction.</CAPTION>
|
||||
<TR><TD><IMG
|
||||
WIDTH="583" HEIGHT="428" BORDER="0"
|
||||
SRC="img381.png"
|
||||
ALT="\begin{figure}\psfig{file=figs/fig04.14.ps}\end{figure}"></TD></TR>
|
||||
</TABLE>
|
||||
</DIV>
|
||||
|
||||
<P>
|
||||
The attack segment goes to a target specified as ``$1" (the first
|
||||
creation argument of the abstraction) over ``$2" milliseconds; these
|
||||
values may be overwritten by sending numbers to the ``peak level" and ``attack"
|
||||
inlets. The release segment is similar, but simpler, since the target is
|
||||
always zero. The hard part is the decay segment, which again must be set
|
||||
off after a delay equal to the attack time (the <TT>del $2</TT> object).
|
||||
The sustain level is calculated from the peak level and the sustain percentage
|
||||
(multiplying the two and dividing by 100).
|
||||
|
||||
<P>
|
||||
The trigger inlet, if sent a number other than zero, triggers an
|
||||
onset (the attack
|
||||
and decay segments), and if sent zero, triggers the release segment.
|
||||
Furthermore, the ADSR generator may be reset to zero by sending a negative
|
||||
trigger (which also generates an onset).
|
||||
|
||||
<P>
|
||||
<HR>
|
||||
<!--Navigation Panel-->
|
||||
<A NAME="tex2html1576"
|
||||
HREF="node70.html">
|
||||
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/next.png"></A>
|
||||
<A NAME="tex2html1570"
|
||||
HREF="node68.html">
|
||||
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/up.png"></A>
|
||||
<A NAME="tex2html1564"
|
||||
HREF="node68.html">
|
||||
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/prev.png"></A>
|
||||
<A NAME="tex2html1572"
|
||||
HREF="node4.html">
|
||||
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/contents.png"></A>
|
||||
<A NAME="tex2html1574"
|
||||
HREF="node201.html">
|
||||
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
|
||||
SRC="file:/usr/local/share/lib/latex2html/icons/index.png"></A>
|
||||
<BR>
|
||||
<B> Next:</B> <A NAME="tex2html1577"
|
||||
HREF="node70.html">Transfer functions for amplitude</A>
|
||||
<B> Up:</B> <A NAME="tex2html1571"
|
||||
HREF="node68.html">Examples</A>
|
||||
<B> Previous:</B> <A NAME="tex2html1565"
|
||||
HREF="node68.html">Examples</A>
|
||||
<B> <A NAME="tex2html1573"
|
||||
HREF="node4.html">Contents</A></B>
|
||||
<B> <A NAME="tex2html1575"
|
||||
HREF="node201.html">Index</A></B>
|
||||
<!--End of Navigation Panel-->
|
||||
<ADDRESS>
|
||||
Miller Puckette
|
||||
2006-12-30
|
||||
</ADDRESS>
|
||||
</BODY>
|
||||
</HTML>
|
||||
Reference in New Issue
Block a user