ref: 078775bee5683e3c0a74ab5b5313d11fa2ee0229
parent: c42c6db46f79df5ea281c97ea3421740855fc964
author: Ralph Giles <[email protected]>
date: Fri Jan 17 10:44:08 EST 2014
Reference vorbis source code for lpc coefficient calculation.
--- a/doc/draft-ietf-codec-oggopus.xml
+++ b/doc/draft-ietf-codec-oggopus.xml
@@ -1256,7 +1256,7 @@
<section anchor="lpc" title="LPC Extrapolation">
<t>
The first step in LPC extrapolation is to compute linear prediction
- coefficients.
+ coefficients. <xref target="lpc-sample"/>
When extending the end of the signal, order-N (typically with N ranging from 8
to 40) LPC analysis is performed on a window near the end of the signal.
The last N samples are used as memory to an infinite impulse response (IIR)
@@ -1484,6 +1484,18 @@
<date month="January" year="2014"/>
</front>
</reference>
+
+<reference anchor="lpc-sample"
+ target="https://svn.xiph.org/trunk/vorbis/lib/lpc.c">
+<front>
+ <title>Autocorrelation LPC coeff generation algorithm
+ (vorbis source code)</title>
+<author initials="J." surname="Degener" fullname="Jutta Degener"/>
+<author initials="C." surname="Bormann" fullname="Carsten Bormann"/>
+<date month="November" year="1994"/>
+</front>
+</reference>
+
<reference anchor="replay-gain"
target="http://wiki.xiph.org/VorbisComment#Replay_Gain">