Browse Prior Art Database

RTP Payload for Redundant Audio Data (RFC2198)

IP.com Disclosure Number: IPCOM000002756D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 9 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Perkins: AUTHOR [+8]

Abstract

This document describes a payload format for use with the real-time transport protocol (RTP), version 2, for encoding redundant audio data. The primary motivation for the scheme described herein is the development of audio conferencing tools for use with lossy packet networks such as the Internet Mbone, although this scheme is not limited to such applications.

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Network Working Group C. Perkins

Request for Comments: 2198 I. Kouvelas

Category: Standards Track O. Hodson

V. Hardman

University College London

M. Handley

ISI

J.C. Bolot

A. Vega-Garcia

S. Fosse-Parisis

INRIA Sophia Antipolis

September 1997

RTP Payload for Redundant Audio Data

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.

Abstract

This document describes a payload format for use with the real-time

transport protocol (RTP), version 2, for encoding redundant audio

data. The primary motivation for the scheme described herein is the

development of audio conferencing tools for use with lossy packet

networks such as the Internet Mbone, although this scheme is not

limited to such applications.

1 Introduction

If multimedia conferencing is to become widely used by the Internet

Mbone community, users must perceive the quality to be sufficiently

good for most applications. We have identified a number of problems

which impair the quality of conferences, the most significant of

which is packet loss. This is a persistent problem, particularly

given the increasing popularity, and therefore increasing load, of

the Internet. The disruption of speech intelligibility even at low

loss rates which is currently experienced may convince a whole

generation of users that multimedia conferencing over the Internet is

not viable. The addition of redundancy to the data stream is offered

as a solution [1]. If a packet is lost then the missing information

may be reconstructed at the receiver from the redundant data that

arrives in the following packet(s), provided that the average number

of consecutively lost packets is small. Recent work [4,5] shows that

packet loss patterns in the Internet are such that this scheme

typically functions well.

This document describes an RTP payload format for the transmission of

audio data encoded in such a redundant fashion. Section 2 presents

the requirements and motivation leading to the definition of this

payload format, and does not form part of the ...