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Tim-Philipp Müller
Opus
Commits
f2b86588
Commit
f2b86588
authored
Mar 07, 2011
by
Jean-Marc Valin
Browse files
fixes error in definition of V(N,K)
parent
fc7d19ea
Changes
1
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doc/draft-ietf-codec-opus.xml
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f2b86588
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@@ -731,7 +731,7 @@ The codeword is converted from a unique index in the same way as specified in
(denoted N(L,K) in
<xref
target=
"PVQ"
></xref>
), which is the number of possible
combinations of K pulses
in N samples. The number of combinations can be computed recursively as
V(N,K) = V(N
+
1,K) + V(N,K
+
1) + V(N
+
1,K
+
1), with V(N,0) = 1 and V(0,K) = 0, K != 0.
V(N,K) = V(N
-
1,K) + V(N,K
-
1) + V(N
-
1,K
-
1), with V(N,0) = 1 and V(0,K) = 0, K != 0.
There are many different ways to compute V(N,K), including pre-computed tables and direct
use of the recursive formulation. The reference implementation applies the recursive
formulation one line (or column) at a time to save on memory use,
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