The IESG has approved the following document:
- 'RTP Payload Formats for European Telecommunications Standards Institute
(ETSI) European Standard ES 202 050, ES 202 211, and ES 202 212 Distributed
Speech Recognition Encoding '
<draft-ietf-avt-rtp-dsr-codecs-03.txt> as a Proposed Standard
This document is the product of the Audio/Video Transport Working Group.
The IESG contact persons are Allison Mankin and Jon Peterson.
Technical Summary
Distributed speech recognition (DSR) technology in this architecture
uses remote device acting as a thin client, also known as the front-end,
to communicate with a speech recognition server, also called a speech
engine, over a network connection, to obtain speech recognition
services. More details on DSR over Internet can be found in RFC 3557
To achieve interoperability with different client devices and speech
engines, the first ETSI standard DSR front-end ES 201 108 was
published in early 2000 and an RTP packetization for ES 201 108
frames is defined in RFC 3557 by IETF.
In ES 202 050, ETSI issues another standard for an Advanced DSR
front-end that provides substantially improved recognition
performance when background noise is present. The codecs in ES 202
050 use a slightly different frame format from those of ES 201 108
and thus the two do not inter-operate with each other.
The RTP packetization for ES 202 050 front-end defined in this
document uses the same RTP packet format layout as that defined in
RFC 3557. The differences are in the DSR codec frame bit
definition and the payload type MIME registration.
The two further standards, ES 202 211 and ES 202 212, for which this
document offers payloads, provide extensions to the each of the
DSR front-end standards. These respective extensions allow the
speech waveform to be reconstructed for human audition and they
can also be used to improve recognition performance for tonal
languages. This is done by sending additional pitch and voicing
information for each frame along with the recognition features.
Working Group Summary
The document was sent to the ietf-types list for MIME type review and did
not surface any concerns. The DSR issues were reviewed by the SPEECHSC
WG at the time of RFC 3557, and the Area Director viewed this document as
having no new issues. The working group supported advancing this
document.
Protocol Quality
This document was reviewed for the IESG by Magnus Westerlund and
Allison Mankin.
RFC Editor Notes
Section 4
OLD:
Author/Change controller:
* Qiaobing.Xie@motorola.com
* IETF Audio/Video transport working group
NEW:
Author:
* Qiaobing.Xie@motorola.com
Change controller:
* IETF Audio/Video transport working group delegated by the IESG
Section 5
The following paragraph should be moved out of Section 5, and become
Section 4.3 Congestion Control:
Congestion control for RTP MUST be used in accordance with RFC 3550
[9], and any applicable RTP profile, e.g. RFC 3551 [10].
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