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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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@@ -55,7 +55,7 @@ original version by: Nikos Drakos, CBLU, University of Leeds
<B> Up:</B> <A NAME="tex2html3280"
HREF="node178.html">Examples</A>
<B> Previous:</B> <A NAME="tex2html3276"
HREF="node181.html">Timbre stamp (``vocoder")</A>
HREF="node181.html">Timbre stamp ("vocoder")</A>
&nbsp; <B> <A NAME="tex2html3282"
HREF="node4.html">Contents</A></B>
&nbsp; <B> <A NAME="tex2html3284"
@@ -84,7 +84,7 @@ Phase vocoder for time stretching and contraction.</CAPTION>
<P>
The phase vocoder usually refers to the general technique of passing from
(complex-valued) channel amplitudes to pairs consisting of (real-valued)
magnitudes and phase precession rates (``frequencies"), and back, as
magnitudes and phase precession rates ("frequencies"), and back, as
described in Figure <A HREF="node175.html#fig09.11">9.11</A> (Section <A HREF="node175.html#sect9.phase">9.5</A>). In
Example I07.phase.vocoder.pd (Figure <A HREF="#fig09.18">9.18</A>), we use this technique with the
specific aim of time-stretching and/or time-contracting a recorded sound
@@ -118,8 +118,8 @@ computation than a full-precision square root and reciprocal would.
<P>
The process starts with a sub-patch, <TT>pd read-windows</TT>, that outputs
two Hann-windowed blocks of the recorded sound, a ``back" one and a
``front" one 1/4 window further forward in the recording. The window
two Hann-windowed blocks of the recorded sound, a "back" one and a
"front" one 1/4 window further forward in the recording. The window
shown uses the two outputs of the sub-patch to guide the amplitude
and phase change of each channel of its own output.
@@ -142,7 +142,7 @@ After normalizing <IMG
SRC="img1198.png"
ALT="$S[m-1,k]$">, its complex conjugate (the normalized inverse)
is multiplied by the windowed Fourier
transform of the ``back" window <IMG
transform of the "back" window <IMG
WIDTH="32" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img1199.png"
ALT="$T[k]$">, giving the product <IMG
@@ -151,7 +151,7 @@ transform of the ``back" window <IMG
ALT="$R[k]$"> of
Page <A HREF="node176.html#sect9.phaserelationship"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]"
SRC="crossref.png"></A>.
Next, depending on the value of the parameter ``lock", the computed value of
Next, depending on the value of the parameter "lock", the computed value of
<IMG
WIDTH="33" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img1206.png"
@@ -163,9 +163,9 @@ is done using <TT>lrshift~</TT> objects, whose outputs are added into <IMG
WIDTH="33" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img1206.png"
ALT="$R[k]$"> if
``lock" is set to one, or otherwise not if it is zero.
"lock" is set to one, or otherwise not if it is zero.
The result is then normalized and multiplied by the Hann-windowed Fourier transform
of the ``front" window (<IMG
of the "front" window (<IMG
WIDTH="37" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img1196.png"
ALT="$T'[k]$">) to give <IMG
@@ -239,7 +239,7 @@ can be made using daisy-chained cross-fades.
<B> Up:</B> <A NAME="tex2html3280"
HREF="node178.html">Examples</A>
<B> Previous:</B> <A NAME="tex2html3276"
HREF="node181.html">Timbre stamp (``vocoder")</A>
HREF="node181.html">Timbre stamp ("vocoder")</A>
&nbsp; <B> <A NAME="tex2html3282"
HREF="node4.html">Contents</A></B>
&nbsp; <B> <A NAME="tex2html3284"