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Rotation wip

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This commit is contained in:
Jean-Marc Valin 2011-09-06 08:03:38 -04:00
parent fbbd9bf608
commit 018b0df9c9
2 changed files with 16 additions and 4 deletions
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3
doc/build_draft.sh
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@ -45,5 +45,6 @@ echo '</artwork>' >> opus_compare_escaped.c
echo '</figure>' >> opus_compare_escaped.c
echo running xml2rfc
xml2rfc draft-ietf-codec-opus.xml draft-ietf-codec-opus.html &
xml2rfc draft-ietf-codec-opus.xml
xml2rfc draft-ietf-codec-opus.xml draft-ietf-codec-opus.html
wait

17
doc/draft-ietf-codec-opus.xml
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@ -4291,16 +4291,27 @@ the value of the "spread" parameter in the bit-stream.
The rotation angle is then calculated as
<figure align="center">
<artwork align="center"><![CDATA[
pi * g_r^2
theta = -----------
2
pi * g_r
theta = ----------
4
]]></artwork>
</figure>
A 2-D rotation R(i,j) between points x_i and x_j is defined as:
<figure align="center">
<artwork align="center"><![CDATA[
x_i' = cos(theta)*x_i + sin(theta)*x_j
x_j' = -sin(theta)*x_i + cos(theta)*x_j
]]></artwork>
</figure>
An N-D rotation is then achieved by applying a series of 2-D rotations back and forth, in the
following order: R(x_1, x_2), R(x_2, x_3), ..., R(x_N-2, X_N-1), R(x_N-1, X_N),
R(x_N-2, X_N-1), ..., R(x_1, x_2).
</t>
<t>
If the decoded vector represents more
If the decoded vector represents more
than one time block, then the following process is applied separately on each time block.
</t>
</section>