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Any Dolby Digital 5.1 music CD?
Posted by Nigel Pond [SysOp] [IP: 206.241.18.4] on August 19, 1999 at 16:01:09 In Reply to: Any Dolby Digital 5.1 music CD? posted by Jonas A on August 19, 1999 at 14:33:28: Jonas : If thats the case neither CD-ROMs nor VideoCD would be allowed to be called CDs.. No, CD-R, CD-RW, Video CD etc etc, each have their own specs (orange book, green book etc) which allow them to use that specific designation. There is no spec for "DTS CDs" so strictly speaking they should not be called CDs. It's a question of trademark licensing - you only get a license to use the CD trademark if you comply with the Red Book spec - DTS audio discs do not. : Dont confuse things, A CD can be a CD even if it's not a CD-DA! I am not - see above. : There are music recordings in DD5.1 widely available, but only on DVD-Video. A normal CD-player can't pass DD5.1 bitstream thru since it doesn't recognize the format. In theory a CD player should not be able to play a DTS disc either as it is not in PCM, but the DTS track carries a flag to trick the CD player into thinking it is PCM so that is outputs it. Disc capacity issues aside, there is no reason why a "DD5.1 CD" could not do the same thing to allow output of its audio on a digital output. : DTS-CDs however are formatted like Audio-CD (Red Book) even though they contain the DTS bitstream instead of the PCM bitstream. That's incorrect - the Red Book as I underdstand it specifies PCM 16/44.1 audio, and PCM 16/44.1 audio only. DTS discs do not have PCM 16/44.1 audio so do not comply with the specs - period, end of story. :This way they can be played in a regular CD-player with digital out and a DTS decoder (You will only get noise from the CDs internal D/A however..) They do that because they fool the player with a PCM flag...see above. Maybe I should ask Stuart to comment on this thread - he's the real expert.
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