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ITU-T Recommendation G.722.1:

Explore the ITU-T Recommendation G.722.1, an approved standard from September 1999 for wideband audio coding. This document covers its features, including a frequency range of 50Hz to 7kHz, and two bit rates of 24kbit/s or 32kbit/s. With low complexity less than 15 MIPS, it utilizes 20ms frames consisting of 60 or 80 octets per frame. It also discusses the mapping of G.722.1 into RTP Payload format and addresses issues like typos and inconsistencies noted after its submission to IETF.

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ITU-T Recommendation G.722.1:

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  1. ITU-T Recommendation G.722.1: The RTP Packetization Steve Casner (CISCO) for A. Crossman (PictureTel) tonyc@pictel.com

  2. Overview • ITU-T standard approved in Sept. 1999 • Wideband 50Hz - 7kHz • Two rates: 24kbit/s or 32kbit/s • Low complexity, < 15MIPS • 20ms frames (60 or 80 octets/frame) • Quality equivalent to ITU-T G.722

  3. first bit transmitted last bit transmitted sequence (for one frame) of bits (480 or 640) output by encoder msb… lsb msb… lsb msb… lsb msb… lsb msb… lsb RTP octet 1 RTP octet 2 RTP octet 3 RTP octet 60 or 80 Mapping G.722.1 into RTP Octets

  4. RTP Payload Format 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RTP Header [see RFC 1889] | +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ | | + one or more frames of G.722.1 | | .... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  5. Issues • ITU-T approved same H.323/RTP packet format in Feb. 2000 • Typos in this draft resulted after submission to IETF - includes badly formatted references • Notify author of inconsistencies/typos etc.

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