add files from http://msp.ucsd.edu/techniques/latest/book-html.tgz
This commit is contained in:
178
node98.html
Normal file
178
node98.html
Normal file
@@ -0,0 +1,178 @@
|
||||
<!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>Wavetable pulse train</TITLE>
|
||||
<META NAME="description" CONTENT="Wavetable pulse train">
|
||||
<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="node99.html">
|
||||
<LINK REL="previous" HREF="node97.html">
|
||||
<LINK REL="up" HREF="node97.html">
|
||||
<LINK REL="next" HREF="node99.html">
|
||||
</HEAD>
|
||||
|
||||
<BODY >
|
||||
<!--Navigation Panel-->
|
||||
<A NAME="tex2html2014"
|
||||
HREF="node99.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="tex2html2008"
|
||||
HREF="node97.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="tex2html2002"
|
||||
HREF="node97.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="tex2html2010"
|
||||
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="tex2html2012"
|
||||
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="tex2html2015"
|
||||
HREF="node99.html">Simple formant generator</A>
|
||||
<B> Up:</B> <A NAME="tex2html2009"
|
||||
HREF="node97.html">Examples</A>
|
||||
<B> Previous:</B> <A NAME="tex2html2003"
|
||||
HREF="node97.html">Examples</A>
|
||||
<B> <A NAME="tex2html2011"
|
||||
HREF="node4.html">Contents</A></B>
|
||||
<B> <A NAME="tex2html2013"
|
||||
HREF="node201.html">Index</A></B>
|
||||
<BR>
|
||||
<BR>
|
||||
<!--End of Navigation Panel-->
|
||||
|
||||
<H2><A NAME="SECTION001051000000000000000">
|
||||
Wavetable pulse train</A>
|
||||
</H2>
|
||||
|
||||
<P>
|
||||
Example F01.pulse.pd (Figure <A HREF="#fig06.12">6.13</A>) generates a variable-width pulse train
|
||||
using stretched wavetable lookup. Figure
|
||||
<A HREF="#fig06.13">6.14</A> shows two intermediate products of the patch and its output.
|
||||
The patch carries out the job in the simplest possible way, placing the
|
||||
pulse at phase <IMG
|
||||
WIDTH="13" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img41.png"
|
||||
ALT="$\pi $"> instead of phase zero; in later
|
||||
examples this will be fixed by adding 0.5 to the phase and wrapping.
|
||||
|
||||
<P>
|
||||
|
||||
<DIV ALIGN="CENTER"><A NAME="fig06.12"></A><A NAME="6962"></A>
|
||||
<TABLE>
|
||||
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.13:</STRONG>
|
||||
Example patch F01.pulse.pd, which synthesizes a pulse train using
|
||||
stretched wavetable lookup.</CAPTION>
|
||||
<TR><TD><IMG
|
||||
WIDTH="436" HEIGHT="408" BORDER="0"
|
||||
SRC="img610.png"
|
||||
ALT="\begin{figure}\psfig{file=figs/fig06.12.ps}\end{figure}"></TD></TR>
|
||||
</TABLE>
|
||||
</DIV>
|
||||
|
||||
<P>
|
||||
|
||||
<DIV ALIGN="CENTER"><A NAME="fig06.13"></A><A NAME="7046"></A>
|
||||
<TABLE>
|
||||
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.14:</STRONG>
|
||||
Intermediate audio signals from Figure <A HREF="#fig06.12">6.13</A>: (a) the
|
||||
result of multiplying the phasor by the ``index"; (b) the same, clipped to
|
||||
lie between -0.5 and 0.5; (c) the output.</CAPTION>
|
||||
<TR><TD><IMG
|
||||
WIDTH="349" HEIGHT="429" BORDER="0"
|
||||
SRC="img611.png"
|
||||
ALT="\begin{figure}\psfig{file=figs/fig06.13.ps}\end{figure}"></TD></TR>
|
||||
</TABLE>
|
||||
</DIV>
|
||||
|
||||
<P>
|
||||
The initial phase is adjusted to run from -0.5 to 0.5 and then scaled by a
|
||||
multiplier of at least one, resulting in the signal of Figure <A HREF="#fig06.13">6.14</A>
|
||||
(part a); this corresponds to the output of the <TT>*~</TT> object, fifth
|
||||
from bottom in the patch shown. The graph in part (b) shows the result of
|
||||
clipping the sawtooth wave back to the interval between <IMG
|
||||
WIDTH="36" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img612.png"
|
||||
ALT="$-0.5$"> and <IMG
|
||||
WIDTH="23" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img613.png"
|
||||
ALT="$0.5$">, using the
|
||||
<TT>clip~</TT> object. If the scaling multiplier were at its minimum (one), the
|
||||
sawtooth would only range from -0.5 to 0.5 anyway and the clipping would have
|
||||
no effect. For any value of the scaling multiplier greater than one, the
|
||||
clipping output sits at the value -0.5, then ramps to 0.5, then sits at 0.5.
|
||||
The higher the multiplier, the faster the waveform ramps and the
|
||||
more time it spends clipped at the bottom and top.
|
||||
|
||||
<P>
|
||||
The <TT>cos~</TT> object then converts this waveform into a pulse. Inputs of
|
||||
both -0.5 and 0.5 go to -1 (they are one cycle apart); at the midpoint of
|
||||
the waveform, the input is 0 and the output is thus 1. The output therefore
|
||||
sits at -1, traces a full cycle of the cosine function, then comes back to
|
||||
rest at -1. The proportion of time the waveform spends tracing the cosine
|
||||
function is one divided by the multiplier; so it's 100% for a multiplier
|
||||
of 1, 50% for 2, and so on.
|
||||
Finally, the pulse output is adjusted to range from 0 to 1 in
|
||||
value; this is graphed in part (c) of the figure.
|
||||
|
||||
<P>
|
||||
<HR>
|
||||
<!--Navigation Panel-->
|
||||
<A NAME="tex2html2014"
|
||||
HREF="node99.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="tex2html2008"
|
||||
HREF="node97.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="tex2html2002"
|
||||
HREF="node97.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="tex2html2010"
|
||||
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="tex2html2012"
|
||||
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="tex2html2015"
|
||||
HREF="node99.html">Simple formant generator</A>
|
||||
<B> Up:</B> <A NAME="tex2html2009"
|
||||
HREF="node97.html">Examples</A>
|
||||
<B> Previous:</B> <A NAME="tex2html2003"
|
||||
HREF="node97.html">Examples</A>
|
||||
<B> <A NAME="tex2html2011"
|
||||
HREF="node4.html">Contents</A></B>
|
||||
<B> <A NAME="tex2html2013"
|
||||
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