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SACD is capable of encoding recorded audio in either stereophonic sound or surround sound. Although SACD audio streams are encoded in a pulse-density modulation (PDM) scheme called Direct Stream Digital (DSD), a manufacturer may also write a Pulse-code modulation (PCM) layer compatible with conventional Compact Disc players.
Record companies issue most SACDs as backward-compatible hybrid discs. Such a disc can be played in high-resolution audio on a SACD player and conventional Red Book CD or DVD video players (albeit just with standard CD quality). The SACD format is thus backward compatible. SACD machines can play CDs and SACD discs; CD players can play SACD hybrid discs as audio CDs.[21]
SACD includes various copy protection measures of which the most prominent is Pit Signal Processing (PSP), a physical watermarking feature that contains a digital watermark modulated in the width of pits on the disc (data are stored in the pit length). The optical pickup must contain special circuitry to read the PSP watermark, which is then compared to information on the disc to make sure it is legitimate. Because the majority of DVD players and all DVD-ROM drives use an optical pickup that lacks this specialized watermark detection circuitry, although they can read the data on the SACD layer, they cannot decode the audio of a protected SACD disc.[54]
If you do not have your Code, see your dealership or Locating My Code If your car stereo or audio problem is not listed, please email us fcsr@msn.com. All problems are not listed. Audi A4 Symphony II 8E0 035 195 A / CQ-EA1060L 8E0 035 195 H / CQ-EA1360LC (6 CD Changer) CD does not operate properly, error or skips when CD plays, single disc player, $185. Intermittent or No FM, $165.
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