 |
DTS v. Lexicon question
Posted by Heinz Seltmann on October 01, 1998 at 08:22:34:
In Reply to: DTS v. Lexicon question posted by SMR [WizOp] on September 30, 1998 at 23:33:58:
While I agree that this is an annoying "feature", I feel that a few things need
to be brought up.: Unfortunately, the "fizztt" of digital noise is unavoidable with DTS music discs or laserdiscs, the problem lies in the DTS syntax.
: Elegantly designed bitstreams (not DTS which is an inelegant bandwidth hog) contain data flags, which notify a decoder or DAC of the format
: present. Dolby Digital does this, so does PCM so when they hit a decoder or DAC they are identified (or identified as something
: unidentified), decoded or ignored. This is somewhat correct. DTS like
AC-3 does have flags in its bitstream. Otherwise you would never be able to decode and detect what you have. The problem lies in the IEC958 std. which is what we
refer to as S/PDIF or digital audio. IEC958 says, basically, that if the
bitstream has audio ie PCM then the
valid audio flag should be set. Otherwise, if the audio is compressed or
something like AC-3, MLP, etc then the
valid audio flag should not be set.
Now this is all and good but it occures to me that CD players may always assume that audio they get off the CD is always "valid". So the audio processor downstream sees this valid audio flag
and tries to play it JUST LIKE A CD. DTS, IMHO, wanted things to look like CD's as much as possible.
The advantage that DVD has is that the DVD std.
supports IEC-1935(?) which is an add on
of IEC-958 for the support of non-audio
bitstreams. So the biggest problem is
legacy HW in field. Heinz
Follow Ups:
Return to the new SMR Forums Menu
Design
& HTML © SMR Home Theatre, Images © SMR Home Theatre cannot be reproduced without
permission. The images on this page are digitally watermarked. New forum
messages should be posted into SMR Forums v2 - http://www.smr-forums.com/
|
|
