SRFireside
join:2001-01-19
Houston, TX | reply to GOLFnSUN
Re: Reason #3 is the best reason
Those disks cannot be classified as CD (not permitted to bear the trademarked Compact Disc Digital Audio logo) per Phillips because audio disks with DRM do not conform to the Red Book specification for CDs. |
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phaqu
join:2005-05-26
Marietta, GA | Red book standards are manufacturing standards, not content standards. |
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SRFireside
join:2001-01-19
Houston, TX
| Red Book is an audio specification standard as well as the physical standards. Not only does the Red Book standard make specifications for the dimensions of the compact disk it also specifies the bit rate for the content (1411 Kbps), the parameters for disk readers (including error correction), modulation system and subcode channels (anybody remember CD+G?). The Red Book standard stipulates a CD layer at 1.2mm, while DRM enabled CD's have a thinner layer. That and the fact Red Book specifies no more than a bit allocated for anti-copying and you have a non-Red Book disk.
Interestingly enough since those DualDisk albums also have thinner layer (.9mm). As such they cannot be considered CD's either. |
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phaqu
join:2005-05-26
Marietta, GA
| The storage format specs for audio (16 bit resolution and 44.1kHz sample rate) is there for a universal compatible play back in standard cd players. Much like 45s (45 rpm) and Lps (33.3 rpm), in the old days of vinyl records, were the speed standards. If you played it faster or slower it would sound way different. If I made my audio cds at a 24 bit res and 96 kHz sample (what I record at and a better sounding,lower noise floor recording), they would not only not play in a regular cd player but would not have enough space on a regular cd. The files have to be dithered down to 16-44.1.Hence the red book audio storage specification standard. There are no stipulations as to what kind of data is written on the disc, just as long as the audio plays in a regular audio cd player and the tracks can be located. |
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SRFireside
join:2001-01-19
Houston, TX
| The reason Philips says DRM enabled disks cannot be considered compact disk audio is because of exactly what you said. Red Book standards are in place to make sure the CDs conform to specifications that make them play on every CD player built to those specifications. No so with many DRM technologies. A DRM disk will not play on all CD readers, thus not conforming to Red Book standards. Pretty cool decision on Philips part if you ask me. |
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backness
join:2005-07-08
K2P OW2
1 edit | i'm pretty sure your right
It applies to the software layout of the disc as well things such as pre emphasis, playback gaps and a few other things |
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