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<H2>
follow</H2>

<PRE>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; kr&nbsp;&nbsp; <B>follow</B>&nbsp;&nbsp; asig,&nbsp; idt</PRE>

<HR>
<H4>
<U>DESCRIPTION</U></H4>
Envelope follower unit generator.
<H4>
<U>INITIALIZATION</U></H4>
<I>idt</I> - This is the period, in seconds, that the average amplitude
of <I>asig</I> is reported. If the frequency of <I>asig</I> is low then
<I>idt</I> must be large (more than half the period of <I>asig</I> )
<H4>
<U>PERFORMANCE</U></H4>
<I>asig</I> - This is the signal from which to extract the envelope.
<H4>
<U>EXAMPLE:</U></H4>

<PRE>&nbsp;&nbsp; k1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <B>line</B>&nbsp;&nbsp;&nbsp; 0, p3, 30000&nbsp;&nbsp;&nbsp; ; Make k1 a simple envelope
&nbsp;&nbsp; a1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <B>oscil</B>&nbsp;&nbsp; k1, 1000, 1&nbsp;&nbsp;&nbsp;&nbsp; ; Make a simple signal using k1
&nbsp;&nbsp; ak1&nbsp;&nbsp;&nbsp;&nbsp; <B>follow</B>&nbsp; a1, .02&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ; ak1 is now like k1
&nbsp;&nbsp; a2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <B>oscil</B>&nbsp;&nbsp; ak1, 1000, 1&nbsp;&nbsp;&nbsp; ; Make a simple signal using ak1
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <B>out</B>&nbsp;&nbsp;&nbsp;&nbsp; a2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ; Both a1 and a2 are the same</PRE>
To avoid zipper noise, by discontinuities produced from complex envelope
tracking, a lowpass filter could be used, to smooth the estimated envelope.
<BR>&nbsp;

<P><B><U>AUTHOR:&nbsp;<BR>
<BR>
</U></B>Paris Smaragdis&nbsp;<BR>
MIT, Cambridge&nbsp;<BR>
1995
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