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The QCP File Format and Media Types for Speech Data (RFC3625)

IP.com Disclosure Number: IPCOM000019670D
Original Publication Date: 2003-Sep-01
Included in the Prior Art Database: 2003-Sep-30
Document File: 16 page(s) / 29K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Gellens: AUTHOR [+2]

Abstract

RFC 2658 specifies the streaming format for 3GPP2 13K vocoder (High Rate Speech Service Option 17 for Wideband Spread Spectrum Communications Systems, also known as QCELP 13K vocoder) data, but does not specify a storage format. Many implementations have been using the "QCP" file format (named for its file extension) for exchanging QCELP 13K data as well as Enhanced Variable Rate Coder (EVRC) and Selectable Mode Vocoders (SMV) data. (For example, Eudora(r), QuickTime(r), and cmda2000(r) handsets).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 12% of the total text.

Network Working Group R. Gellens

Request for Comments: 3625 H. Garudadri

Updates: 3555 Qualcomm

Category: Informational September 2003

The QCP File Format and Media Types for Speech Data

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard of any kind. Distribution of this

memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2003). All Rights Reserved.

Abstract

RFC 2658 specifies the streaming format for 3GPP2 13K vocoder (High

Rate Speech Service Option 17 for Wideband Spread Spectrum

Communications Systems, also known as QCELP 13K vocoder) data, but

does not specify a storage format. Many implementations have been

using the "QCP" file format (named for its file extension) for

exchanging QCELP 13K data as well as Enhanced Variable Rate Coder

(EVRC) and Selectable Mode Vocoders (SMV) data. (For example,

Eudora(r), QuickTime(r), and cmda2000(r) handsets).

This document specifies the QCP file format and updates the

audio/qcelp media registration to specify this format for storage,

and registers the audio/evrc-qcp and audio/smv-qcp media types for

EVRC and SMV (respectively) data stored in this format.

Gellens & Garudadri Informational [Page 1]

RFC 3625 QCP File Format and Media Types September 2003

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2

2. Conventions Used in this Document. . . . . . . . . . . . . . . 2

3. QCP File Format. . . . . . . . . . . . . . . . . . . . . . . . 2

4. IANA Considerations. . . . . . . . . . . . . . . . . . . . . . 10

4.1. Update of Media Type Audio/qcelp . . . . . . . . . . . . 10

4.2. Update of Media Type Audio/vnd.qcelp . . . . . . . . . . 10

4.3. Registration of Audio/EVRC-QCP . . . . . . . . . . . . . 11

4.4. Registration of Audio/SMV-QCP. . . . . . . . . . . . . . 12

5. Security Considerations. . . . . . . . . . . . . . . . . . . . 13

6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13

7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7.1. Normative References . . . . . . . . . . . . . . . . . . 13

7.2. Informative References . . . . . . . . . . . . . . . . . 13

8. Intellectual Property Statement. . . . . . . . . . . . . . . . 14

9. Editors' Addresses . . . . . . . . . . . . . . . . . . . . . . 14

10. Full Copyright Statement . . . . . . . . . . . . . . . . . . . 15

1. Introduction

This document specifies the QCP format for storage of [QCELP] 13K,

[EVRC], and [SMV] vocoder frames in files which may reside on network

elements (e.g., media servers, Multimedia Messaging System (MMS)

centers, etc.) and third-generation cellular (3G) handsets, or be

transmitted via email or other mechanisms.

Vocoder frames read from a QCP file may be streamed using protocols

and formats outside the scope of this document, delivered to an

[EVRC], [SMV], or [QCELP] 13K decoder, or otherwise processed.

The QCP format supports [QCELP] 13K as well as [EVRC] and [SMV] data.

Note t...