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<H2>
specptrk, specsum, specdisp</H2>
<PRE> koct <B>specptrk</B> wsig, inptls, irolloff, iodd[, interp, ifprd, iwtflg]
ksum <B>specsum</B> wsig[, interp]
<B>specdisp</B> wsig, iprd[, iwtflg]</PRE>
<HR>
<H4>
<U>INITIALIZATION</U></H4>
<I>interp</I> (optional) - if non-zero, interpolate the output signal (<I>koct
</I>or <I>ksum</I>). The default value is 0 (repeat the signal value between
changes).
<P><I>ifprd</I> (optional) - if non-zero, display the internally computed
fundamental spectrum. The default value is 0 (no display).
<P><I>iwtflg</I> (optional) - wait flag. If non-zero, hold each display
until released by the user. The default value is 0 (no wait).
<H4>
<U>PERFORMANCE</U></H4>
<B>specptrk</B> - estimate the pitch of the most prominent complex tone
in the spectrum. At note initialization this unit creates a set of <I>inptls</I>
harmonically related partials (odd if <I>iodd</I> non-zero) with amplitude
rolloff to the fraction <I>irolloff</I> per octave. Then at each new frame
of <I>wsig</I>, the spectrum is cross-correlated with this set, and the
result at each point added to an internal copy of the spectrum (optionally
displayed). A pitch is then estimated, and the result is released in decimal
octave form. Between frames, the output is either repeated or interpolated
at the K-rate.
<P><B>specsum</B> - sum the magnitudes across all channels of the spectrum.
At each new frame of <I>wsig</I>, the magnitudes are summed and released
as a scalar <I>ksum</I> signal. Between frames, the output is either repeated
or interpolated at the K-rate. This unit produces a k-signal summation
of the magnitudes present in the spectral data, and is thereby a running
measure of its moment-to-moment overall strength.
<P><B>specdisp</B> - display the magnitude values of spectrum <I>wsig</I>every
<I>iprd</I> seconds (rounded to some integral number of <I>wsig</I>'s originating
<I>iprd</I>).
<H4>
<U>EXAMPLE:</U></H4>
<PRE> ksum <B>specsum</B> wsig, 1 ; sum the spec bins, and ksmooth
if ksum < 2000 kgoto zero ; if sufficient amplitude
koct <B>specptrk</B> wsig ; pitch-track the signal
kgoto contin
zero: koct = 0 ; else output zero
contin:</PRE>
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