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- Four-channel_Compact_Disc_Digital_Audio abstract "Compact Disc recordings contain two channels of 44.1-kHz 16-bit linear PCM audio. However, creators of the CD originally contemplated a four-channel, or quadraphonic, mode as well.The proprietary Red Book specification, as published by Sony and Philips, briefly mentions a four-channel mode in its June 1980, September 1983, and November 1991 editions. On the first page, it lays out the \"Main parameters\" of the CD system, including: \"Number of channels: 2 and/or 4 simultaneously[*] sampled.\" The footnote says, \"In the case of more than two channels the encoder and decoder diagrams have to be adapted.\"The Red Book also reserved the first bit of the so-called Q subchannel \"control field\" to signal the presence of four-channel audio, but did not specify a method for using four-channel in the CD system. Had it been later specified, this mode might have included four separate channels of linear PCM audio (requiring some combination of faster rotation, a lower sampling rate, or fewer bits per sample). Alternatively, the \"four-channel\" bit could have been used merely to indicate the presence of a matrix-encoded recording.In reality, however, the underspecified \"four-channel\" mode was dropped from the CD standard when it was adopted by the International Electrotechnical Commission and became IEC 908:1987, and later IEC 60908:1999. (Various national authorities have also adopted the IEC standard. E.g., it is also European Standard EN 60908:1999.)Neither the 1987 nor the 1999 version of the IEC standard discusses the possibility of four-channel audio. Instead, the IEC document reserves the first bit of the Q subchannel \"control field\" to a different, although similarly cryptic, purpose—according to clause 17.5 note 2, it is for \"Broadcasting use\" in \"non-audio applications of the Compact Disc.\"Since the behavior of the \"four-channel\" or \"Broadcasting use\" bit was never specified by either CD standard, no mass-marketed discs have attempted to use the Red Book's four-channel mode, and no players have purported to implement it.".
- Four-channel_Compact_Disc_Digital_Audio wikiPageID "1935390".
- Four-channel_Compact_Disc_Digital_Audio wikiPageLength "2600".
- Four-channel_Compact_Disc_Digital_Audio wikiPageOutDegree "14".
- Four-channel_Compact_Disc_Digital_Audio wikiPageRevisionID "635165082".
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Category:Audio_storage.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Category:Compact_disc.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Category:Quadraphonic_sound.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Compact_Disc_Digital_Audio.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Compact_disc.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink International_Electrotechnical_Commission.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Matrix_decoder.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Multitrack_recording.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Philips.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Pulse-code_modulation.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Quadraphonic_sound.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Sony.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLink Surround_sound.
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLinkText "Four-channel Compact Disc Digital Audio".
- Four-channel_Compact_Disc_Digital_Audio wikiPageWikiLinkText "Four-channel sound".
- Four-channel_Compact_Disc_Digital_Audio wikiPageUsesTemplate Template:Refimprove.
- Four-channel_Compact_Disc_Digital_Audio subject Category:Audio_storage.
- Four-channel_Compact_Disc_Digital_Audio subject Category:Compact_disc.
- Four-channel_Compact_Disc_Digital_Audio subject Category:Quadraphonic_sound.
- Four-channel_Compact_Disc_Digital_Audio type Document.
- Four-channel_Compact_Disc_Digital_Audio type Disc.
- Four-channel_Compact_Disc_Digital_Audio type Document.
- Four-channel_Compact_Disc_Digital_Audio type Redirect.
- Four-channel_Compact_Disc_Digital_Audio comment "Compact Disc recordings contain two channels of 44.1-kHz 16-bit linear PCM audio. However, creators of the CD originally contemplated a four-channel, or quadraphonic, mode as well.The proprietary Red Book specification, as published by Sony and Philips, briefly mentions a four-channel mode in its June 1980, September 1983, and November 1991 editions.".
- Four-channel_Compact_Disc_Digital_Audio label "Four-channel Compact Disc Digital Audio".
- Four-channel_Compact_Disc_Digital_Audio sameAs Q8565048.
- Four-channel_Compact_Disc_Digital_Audio sameAs m.0679bx.
- Four-channel_Compact_Disc_Digital_Audio sameAs Q8565048.
- Four-channel_Compact_Disc_Digital_Audio sameAs 四軌音訊CD.
- Four-channel_Compact_Disc_Digital_Audio wasDerivedFrom Four-channel_Compact_Disc_Digital_Audio?oldid=635165082.
- Four-channel_Compact_Disc_Digital_Audio isPrimaryTopicOf Four-channel_Compact_Disc_Digital_Audio.