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Lucas Cordiviola
2022-04-12 23:17:03 -03:00
parent 1ca5c25706
commit 19822c017f
89 changed files with 282 additions and 282 deletions
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node101.html
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@@ -86,7 +86,7 @@ The phase-aligned formant (PAF) synthesis algorithm.</CAPTION>
Example F12.paf.pd (Figure <A HREF="#fig06.17">6.18</A>) is a realization of the PAF generator,
described in Section <A HREF="node96.html#sect6.paf">6.4</A>.
The control inputs specify the fundamental frequency, the center frequency, and
the bandwidth, all in ``MIDI" units. The first steps taken in the realization
the bandwidth, all in "MIDI" units. The first steps taken in the realization
are to divide center frequency by fundamental (to get the center frequency quotient)
and bandwidth by fundamental to get the index of modulation for the
waveshaper. The center frequency quotient is sampled-and-held so that it is
@@ -95,7 +95,7 @@ only updated at periods of the fundamental.
<P>
The one oscillator (the <TT>phasor~</TT> object) runs at the fundamental
frequency. This is used both to control a <TT>samphold~</TT> object which
synchronizes updates to the center frequency quotient (labeled ``C.F. relative
synchronizes updates to the center frequency quotient (labeled "C.F. relative
to fundamental" in the figure), and to compute phases for both <TT>cos~</TT> objects which operate as shown earlier in Figure <A HREF="node100.html#fig06.16">6.17</A>.
<P>
@@ -115,7 +115,7 @@ The amplitude of the half-sinusoid is then adjusted by an index of modulation
WIDTH="38" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img588.png"
ALT="${\omega_b}/\omega$">). The table
(``bell-curve") holds an unnormalized Gaussian curve sampled
("bell-curve") holds an unnormalized Gaussian curve sampled
from -4 to 4 over 200 points (25 points per unit), so the center of the table,
at point 100, corresponds to the central peak of the bell curve. Outside the
interval from -4 to 4 the Gaussian curve is negligibly small.
@@ -145,31 +145,31 @@ Filling in the wavetable for Figure <A HREF="#fig06.17">6.18</A>.</CAPTION>
WIDTH="57" HEIGHT="41" ALIGN="MIDDLE" BORDER="0"
SRC="img623.png"
ALT="\fbox{ $\mathrm{until}$\ }"> :
<A NAME="7054"></A>When the left, ``start" inlet is banged, output sequential bangs (with no
elapsed time between them) iteratively, until the right, ``stop" inlet is
banged. The stopping ``bang" message must originate somehow from the
<TT>until</TT> object's outlet; otherwise, the outlet will send ``bang" messages
<A NAME="7054"></A>When the left, "start" inlet is banged, output sequential bangs (with no
elapsed time between them) iteratively, until the right, "stop" inlet is
banged. The stopping "bang" message must originate somehow from the
<TT>until</TT> object's outlet; otherwise, the outlet will send "bang" messages
forever, freezing out any other object which could break the loop.
<P>
As used here, a loop driven by an <TT>until</TT> object
counts from 0 to 199, inclusive. The loop count is maintained by the
``<TT>f</TT>" and ``<TT>+ 1</TT>" objects, each of which feeds the other. But
since the ``<TT>+ 1</TT>" object's output goes to the right inlet of the
``<TT>f</TT>", its result (one greater) will only emerge from the
``<TT>f</TT>" the next time it is banged by ``<TT>until</TT>". So each bang
from ``<TT>until</TT>" increments the value by one.
"<TT>f</TT>" and "<TT>+ 1</TT>" objects, each of which feeds the other. But
since the "<TT>+ 1</TT>" object's output goes to the right inlet of the
"<TT>f</TT>", its result (one greater) will only emerge from the
"<TT>f</TT>" the next time it is banged by "<TT>until</TT>". So each bang
from "<TT>until</TT>" increments the value by one.
<P>
The order in which the loop is started matters: the upper ``<TT>t b b</TT>"
object (short for ``trigger bang bang") must first send zero to the
``<TT>f</TT>", thus initializing it, and then set the <TT>until</TT> object sending
The order in which the loop is started matters: the upper "<TT>t b b</TT>"
object (short for "trigger bang bang") must first send zero to the
"<TT>f</TT>", thus initializing it, and then set the <TT>until</TT> object sending
bangs, incrementing the value, until stopped. To stop it when the value
reaches 199, a <TT>select</TT> object checks the value and, when it sees the
match, bangs the ``stop" inlet of the <TT>until</TT> object.
match, bangs the "stop" inlet of the <TT>until</TT> object.
<P>
Meanwhile, for every number from 0 to 199 that comes out of the ``<TT>f</TT>"
Meanwhile, for every number from 0 to 199 that comes out of the "<TT>f</TT>"
object, we create an ordered pair of messages to the <TT>tabwrite</TT> object.
First, at right, goes the index itself, from 0 to 199. Then for the left inlet,
the first <TT>expr</TT> object adjusts the index to range from -4 to 4 (it