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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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node180.html
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@@ -52,7 +52,7 @@ original version by: Nikos Drakos, CBLU, University of Leeds
SRC="index.png"></A>
<BR>
<B> Next:</B> <A NAME="tex2html3260"
HREF="node181.html">Timbre stamp (``vocoder")</A>
HREF="node181.html">Timbre stamp ("vocoder")</A>
<B> Up:</B> <A NAME="tex2html3254"
HREF="node178.html">Examples</A>
<B> Previous:</B> <A NAME="tex2html3248"
@@ -76,7 +76,7 @@ Narrow-band companding: noise suppression</A>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 9.16:</STRONG>
Noise suppression as an example of narrow-band companding: (a)
analysis and reconstruction of the signal; (b) computation of the
``mask".</CAPTION>
"mask".</CAPTION>
<TR><TD><IMG
WIDTH="663" HEIGHT="477" BORDER="0"
SRC="img1227.png"
@@ -151,8 +151,8 @@ and otherwise replaced by zero.
<P>
The mask itself is the product of the measured average noise in each channel,
which is contained in the table ``$0-mask", multiplied by a value named
``mask-level". The average noise is measured in a subpatch
which is contained in the table "$0-mask", multiplied by a value named
"mask-level". The average noise is measured in a subpatch
(<TT>pd calculate-mask</TT>), whose contents are shown in part (b) of the
figure. To compute the mask we are using two new new objects:
@@ -186,7 +186,7 @@ the contents of a table, affecting up to the first <IMG
<P>
The power averaging process is begun by sending a time duration in milliseconds
to ``make-mask". The patch computes the equivalent number of blocks <IMG
to "make-mask". The patch computes the equivalent number of blocks <IMG
WIDTH="10" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img21.png"
ALT="$b$">
@@ -214,11 +214,11 @@ stops evolving.
<P>
To use this patch for classical noise suppression requires at least a few
seconds of recorded noise without the ``signal" present. This is played into
the patch, and its duration sent to ``make-mask", so that the
``$0-mask" table holds the average measured noise power for each channel.
seconds of recorded noise without the "signal" present. This is played into
the patch, and its duration sent to "make-mask", so that the
"$0-mask" table holds the average measured noise power for each channel.
Then, making the assumption that the noisy part of the signal rarely exceeds 10
times its average power (for example), ``mask-level" is set to 10, and the
times its average power (for example), "mask-level" is set to 10, and the
signal to be noise-suppressed is sent through part (a) of the patch. The noise
will be almost all gone, but those channels in which the signal exceeds 20
times the noise power will only be attenuated by 3dB, and higher-power channels
@@ -251,7 +251,7 @@ from any other one.)
SRC="index.png"></A>
<BR>
<B> Next:</B> <A NAME="tex2html3260"
HREF="node181.html">Timbre stamp (``vocoder")</A>
HREF="node181.html">Timbre stamp ("vocoder")</A>
<B> Up:</B> <A NAME="tex2html3254"
HREF="node178.html">Examples</A>
<B> Previous:</B> <A NAME="tex2html3248"