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DVD-Audiobahn New DVD-Audio music releases and talk about the latest players. |
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In Reply to: Re: You probably missed it...(link) posted by Christine Tham on June 18, 2004 at 15:43:56:
***by the way, DVD-A has limitations that require filtering as well. 96/24 5.1 channels require MLP encoding to fit into maximum bitrate of 9.6 Mb/s. however, MLP assumes it is able to achieve a certain level of compression.***'require filtering'? Apart from very rare occurring events in normal music content other filtering requirements than that to fulfill the nyguest criteria are not neccesary.
***Some program material cannot be compressed easily and generate "illegal" files. For example, by definition white noise cannot be compressed, so 96/24 5.1 of white noise will generate an illegal MLP file. The solution is - guess what: filtering the high frequencies.***
White noise at full level is very usefull in a music format.
Filtering at 30kHz instead of 40kHz probably solves the issue.
No big deal.***SACD avoids this issue by specifying a higher maximum transfer rate for the player: 16 Mb/s. so if the material cannot be compressed by DST, it is still legal and able to be transferred to SACD without filtering. you do reduce the maximum playing time though.
Obviously dst is less efficient in reducing the bitrate so a higher bitrate from the player is needed.
The maximum playing time is less than that of a dvda with mlp.
DVDA with mlp is a more flexible format. If the bitrate is too high than mild filtering can be used to remedy the problem.
Filtering hf is only needed during the difficult passage.Maximum playing time isn't compromised by a fancy ability to handle vary rare occurring musical signals or non musical signals like wideband noise at high levels.
Frank
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Follow Ups
- You're diverting the issue.. - Frank.. 12:38:47 06/19/04 (1)
- the point was .. - Christine Tham 00:39:44 06/20/04 (0)
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