Subject: [AVT] ATRAC-X pre-presentation summary

From: Matthew Romaine <[email-masked]>
Date: Wed, 5 Mar 2003 11:26:46 +0900

(apologies for those who already received this; mistyped initial 
address)

Hello all,

Summary of issues that will be covered during my ATRAC-X presentation 
update:

Clarifications and Additions:
- Timestamp and sample rate clarification
- Redundant data framework modified
- New method for multi-channel data decomposition introduced
- Multiplexing/QoS reasoning solidified

Time Stamp
- corresponds to presentation time in milliseconds

Sample Rate
- all ATRAC-X streams during single session must be identical

Revision of Redundant Data Framework
- Comment from Atlanta session : "For redundancy to be useful the 
redundant copy may need to be separated further than one slot."
- TimeStampeOffset added: 14bit unsigned offset value
- What's wrong with RFC 2198?
- RFC 2198 requires payload headers for primary and redundant data; 
creates unnecessary overhead
- Block length field defined at 10bits; insufficient for ATRAC-X's high 
bit-rate data
- Creates complexity in managing ATRAC-X's fragmentation data framework

Multi-channel decomposition
- Introduction of Block Coupling Pattern (BCP); 5bits
- Introduction of Total Channel Configuration (TCC); 3 bits
(table/figure to be presented; also in draft)

Further examples and and figures to be presented.

Looking forward to it.

Matt

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Audio/Video Transport Working Group
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