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<H2>
vdelay</H2>
<PRE> ar <B>vdelay</B> asig, adel, imaxdel [, iskip]</PRE>
<HR>
<H4>
<U>DESCRIPTION</U></H4>
This is an interpolating variable time delay, it is not very different
from the existing implementation (<A HREF="deltap.html">deltapi</A>), it
is only easier to use.
<H4>
<U>INITIALIZATION</U></H4>
<I>imaxdel</I> - Maximum value of delay in samples. If <I>adel</I> gains
a value greater than <I>imaxdel</I> it is folded around <I>imaxdel</I>.
This should not happen.
<P><I>iskip</I> - Skip initialisation if present and non zero
<H4>
<U>PERFORMANCE</U></H4>
With this unit generator it is possible to do Doppler effects or chorusing
and flanging.
<P><I>asig</I> - Input signal.
<P><I>adel</I> - Current value of delay in samples. Note that linear functions
have no pitch change effects. Fast changing values of <I>adel</I> will
cause discontinuities in the waveform resulting noise.
<H4>
<U>EXAMPLE:</U></H4>
<PRE> f1 0 8192 10 1
ims = 100 ; Maximum delay time in msec
a1 <B>oscil</B> 10000, 1737, 1 ; Make a signal
a2 <B>oscil</B> ims/2, 1/p3, 1 ; Make an LFO
a2 = a2 + ims/2 ; Offset the LFO so that it is positive
a3 <B>vdelay</B> a1, a2, ims ; Use the LFO to control delay time
<B>out</B> a3</PRE>
Two important points here. First, the delay time must be always positive.
And second, even though the delay time can be controlled in k-rate, it
is not advised to do so, since sudden time changes will create clicks.
<BR>
<P><B><U>AUTHOR: <BR>
<BR>
</U></B>Paris Smaragdis <BR>
MIT, Cambridge <BR>
1995
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