Commit 945c0c7f authored by Jean-Marc Valin's avatar Jean-Marc Valin
Browse files

Anti-collapse description

parent 8ff61171
......@@ -3036,7 +3036,13 @@ of stereo audio.
<section anchor="anti-collapse" title="Anti-collapse processing">
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.
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