shithub: opus

--- a/doc/draft-ietf-codec-opus.xml

+++ b/doc/draft-ietf-codec-opus.xml

@@ -5022,7 +5022,7 @@

 <t>The band-energy normalized structure of Opus MDCT mode ensures that a

 constant bit allocation for the shape content of a band will result in a

 roughly constant tone-to-noise ratio, which provides for fairly consistent

-perceptual performance. The effectiveness of this approach is the result of

+perceptual performance <xref target='Valin2010'/>. The effectiveness of this approach is the result of

 two factors: that the band energy, which is understood to be perceptually

 important on its own, is always preserved regardless of the shape precision, and because

 the constant tone-to-noise ratio implies a constant intra-band noise to masking ratio.

@@ -5108,7 +5108,7 @@

 may result in waste: bitstream capacity available at the end

 of the frame which can not be put to any use. The maximums

 specified by the codec reflect the average maximum. In the reference

-the maximums are provided in partially computed form, in order to fit in less

+implementation, the maximums are provided in partially computed form, in order to fit in less

 memory as a static table (see cache_caps50[] in static_modes_float.h). Implementations are expected

 to simply use the same table data, but the procedure for generating

 this table is included in rate.c as part of compute_pulse_cache().</t>

@@ -5132,7 +5132,7 @@

 the boost and having enough room to code the boost symbol. The default

 coding cost for a boost starts out at six bits, but subsequent boosts

 in a band cost only a single bit and every time a band is boosted the

-initial cost is reduced (down to a minimum of two). Since the initial

+initial cost is reduced (down to a minimum of two bits). Since the initial

 cost of coding a boost is 6 bits, the coding cost of the boost symbols when

 completely unused is 0.48 bits/frame for a 21 band mode (21*-log2(1-1/2**6)).</t>

@@ -5194,7 +5194,7 @@

 'total' is set to the remaining available 8th bits, computed by taking the

 size of the coded frame times 8 and subtracting ec_tell_frac(). From this value, one (8th bit)

 is subtracted to ensure that the resulting allocation will be conservative. 'anti_collapse_rsv'

-is set to 8 (8th bits) iff the frame is a transient, LM is greater than 1, and total is

+is set to 8 (8th bits) if and only if the frame is a transient, LM is greater than 1, and total is

 greater than or equal to (LM+2) * 8. Total is then decremented by anti_collapse_rsv and clamped

 to be equal to or greater than zero. 'skip_rsv' is set to 8 (8th bits) if total is greater than

 8, otherwise it is zero. Total is then decremented by skip_rsv. This reserves space for the

@@ -7866,6 +7866,18 @@

 </front>

 <seriesInfo name="IEEE Trans. Acoust. Speech Sig. Proc. ASSP-34 (5), 1153-1161" value="1986"/>

 </reference>

+<reference anchor="Valin2010">

+<front>

+<title>A High-Quality Speech and Audio Codec With Less Than 10 ms delay</title>

+<author initials="JM" surname="Valin" fullname="Jean-Marc Valin"><organization/>

+</author>

+<author initials="T. B." surname="Terriberry" fullname="Timothy Terriberry"><organization/></author>

+<author initials="C." surname="Montgomery" fullname="Christopher Montgomery"><organization/></author>

+<author initials="G." surname="Maxwell" fullname="Gregory Maxwell"><organization/></author>

+</front>

+<seriesInfo name="IEEE Trans. on Audio, Speech and Language Processing, Vol. 18, No. 1, pp. 58-67" value="2010" />

+</reference>

 </references>