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draft: reference for LSP stability

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Jean-Marc Valin 2012-05-15 10:49:41 -04:00
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commit 2cb95f5285
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doc/draft-ietf-codec-opus.xml
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@ -2992,7 +2992,7 @@ NLSF_Q15[k] = clamp(0,
However, nothing in either the reconstruction process or the
quantization process in the encoder thus far guarantees that the coefficients
are monotonically increasing and separated well enough to ensure a stable
filter <xref target="line-spectral-pairs"/>.
filter <xref target="Kabal86"/>.
When using the reference encoder, roughly 2% of frames violate this constraint.
The next section describes a stabilization procedure used to make these
guarantees.
@ -7714,6 +7714,17 @@ Robust and Efficient Quantization of Speech LSP Parameters Using Structured Vect
<seriesInfo name="IEEE Trans. on Information Theory, Vol. 32" value="pp. 568-583" />
</reference>
<reference anchor="Kabal86">
<front>
<title>The Computation of Line Spectral Frequencies Using Chebyshev Polynomials</title>
<author initials="P." surname="Kabal" fullname="P. Kabal"><organization/></author>
<author initials="R." surname="Ramachandran" fullname="R. P. Ramachandran"><organization/></author>
<date month="December" year="1986" />
</front>
<seriesInfo name="IEEE Trans. Acoustics, Speech, Signal Processing, vol. 34, no. 6" value="pp. 1419-1426" />
</reference>
<reference anchor="Valgrind" target="http://valgrind.org/">
<front>
<title>Valgrind website</title>