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Mark Harris
Opus
Commits
945c0c7f
Commit
945c0c7f
authored
Jul 08, 2011
by
Jean-Marc Valin
Browse files
Anti-collapse description
parent
8ff61171
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doc/draft-ietf-codec-opus.xml
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945c0c7f
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@@ -3036,7 +3036,13 @@ of stereo audio.
<section
anchor=
"anti-collapse"
title=
"Anti-collapse processing"
>
<t>
When the frame has the transient bit set...
When the frame has the transient bit set, an anti-collapse bit is decoded.
When anti-collapse is set, then the energy in each small MDCT is prevented
from collapsing to zero. For each band of each MDCT where a collapse is
detected, a pseudo-random signal is inserted with an energy corresponding
to the min energy over the two previous frames. A renormalization step is
then required to ensure that the anti-collapse step did not alter the
energy preservation property.
</t>
</section>
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