RTP Payload Format for European Telecommunications Standards Institute (ETSI) European Standard ES 201 108 Distributed Speech Recognition Encoding
RFC 3557
| Document | Type |
RFC - Proposed Standard
(July 2003; No errata)
Was draft-ietf-avt-dsr (avt WG)
|
|
|---|---|---|---|
| Last updated | 2013-03-02 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 3557 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Allison Mankin | ||
| IESG note | A well-constructed payload with just the need of a few grammar edits. SOB has a Discuss to check if there are subtle possible interactions with speechsc. Dave Oran promises any comments quickly. Otherwise the payload was ok with the IESG. | ||
| Send notices to | <csp@csperkins.org>, <magnus.westerlund@ericsson.com> | ||
Network Working Group Q. Xie, Ed.
Request for Comments: 3557 Motorola, Inc.
Category: Standards Track July 2003
RTP Payload Format for
European Telecommunications Standards Institute (ETSI) European Standard
ES 201 108 Distributed Speech Recognition Encoding
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document specifies an RTP payload format for encapsulating
European Telecommunications Standards Institute (ETSI) European
Standard (ES) 201 108 front-end signal processing feature streams for
distributed speech recognition (DSR) systems.
Xie Standards Track [Page 1]
RFC 3557 RTP Payload Format for DSR ES 201 108 July 2003
Table of Contents
1. Conventions and Acronyms . . . . . . . . . . . . . . . . . . . 2
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1. ETSI ES 201 108 DSR Front-end Codec. . . . . . . . . . . 3
2.2. Typical Scenarios for Using DSR Payload Format . . . . . 4
3. ES 201 108 DSR RTP Payload Format. . . . . . . . . . . . . . . 5
3.1. Consideration on Number of FPs in Each RTP Packet. . . . 6
3.2. Support for Discontinuous Transmission . . . . . . . . . 6
4. Frame Pair Formats . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Format of Speech and Non-speech FPs. . . . . . . . . . . 7
4.2. Format of Null FP. . . . . . . . . . . . . . . . . . . . 8
4.3. RTP header usage . . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations. . . . . . . . . . . . . . . . . . . . . . 9
5.1. Mapping MIME Parameters into SDP . . . . . . . . . . . . 10
6. Security Considerations. . . . . . . . . . . . . . . . . . . . 11
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 11
8. Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . 11
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.1. Normative References . . . . . . . . . . . . . . . . . . 11
9.2. Informative References . . . . . . . . . . . . . . . . . 12
10. IPR Notices. . . . . . . . . . . . . . . . . . . . . . . . . . 12
11. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 13
12. Editor's Address . . . . . . . . . . . . . . . . . . . . . . . 14
13. Full Copyright Statement . . . . . . . . . . . . . . . . . . . 15
1. Conventions and Acronyms
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
The following acronyms are used in this document:
DSR - Distributed Speech Recognition
ETSI - the European Telecommunications Standards Institute
FP - Frame Pair
DTX - Discontinuous Transmission
2. Introduction
Motivated by technology advances in the field of speech recognition,
voice interfaces to services (such as airline information systems,
unified messaging) are becoming more prevalent. In parallel, the
popularity of mobile devices has also increased dramatically.
Xie Standards Track [Page 2]
RFC 3557 RTP Payload Format for DSR ES 201 108 July 2003
However, the voice codecs typically employed in mobile devices were
designed to optimize audible voice quality and not speech recognition
accuracy, and using these codecs with speech recognizers can result
in poor recognition performance. For systems that can be accessed
from heterogeneous networks using multiple speech codecs, recognition
system designers are further challenged to accommodate the
characteristics of these differences in a robust manner. Channel
errors and lost data packets in these networks result in further
degradation of the speech signal.
In traditional systems as described above, the entire speech
recognizer lies on the server. It is forced to use incoming speech
in whatever condition it arrives after the network decodes the
vocoded speech. To address this problem, we use a distributed speech
recognition (DSR) architecture. In such a system, the remote device
acts as a thin client, also known as the front-end, in communication
with a speech recognition server, also called a speech engine. The
remote device processes the speech, compresses the data, and adds
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