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<HTML>
<TITLE>GEN04</TITLE>
<CENTER><P><A NAME="GEN04"></A>
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<H2>GEN04</H2>
<PRE><TT> <B>f</B> # time size 4 source# sourcemode </TT>
</PRE>
<P>
<HR></P>
<H4><U>DESCRIPTION</U></H4>
<P>This subroutine generates a normalizing function by examining the contents
of an existing table. </P>
<H4><U>INITIALIZATION</U></H4>
<P><I>size </I>- number of points in the table. Should be power-of-2 plus
1. Must not exceed (except by 1) the size of the source table being examined;
limited to just half that size if the sourcemode is of type offset (see
below). </P>
<P><I>source #</I> - table number of stored function to be examined. </P>
<P><I>sourcemode</I> - a coded value, specifying how the source table is
to be scanned to obtain the normalizing function. Zero indicates that the
source is to be scanned from left to right. Non-zero indicates that the
source has a bipolar structure; scanning will begin at the mid-point and
progress outwards, looking at pairs of points equidistant from the center.</P>
<P><B>Note:</B> </P>
<P>The normalizing function derives from the progressive absolute maxima
of the source table being scanned. The new table is created left-to-right,
with stored values equal to 1/(absolute maximum so far scanned). Stored
values will thus begin with 1/(first value scanned), then get progressively
smaller as new maxima are encountered. For a source table which is normalized
(values <= 1), the derived values will range from 1/(first value scanned)
down to 1. If the first value scanned is zero, that inverse will be set
to 1. </P>
<P>The normalizing function from GEN04 is not itself normalized. </P>
<P><B>GEN04</B> is useful for scaling a table-derived signal so that it
has a consistent peak amplitude. A particular application occurs in waveshaping
when the carrier (or indexing) signal is less than full amplitude. </P>
<H4><B><U>EXAMPLE:</U></B></H4>
<PRE><TT> f 2 0 512 4 1 1 </TT>
</PRE>
<P>This creates a normalizing function for use in connection with the <B><A HREF="./gen03.html">GEN03</A></B>
table 1 example. Midpoint bipolar offset is specified. </P>
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