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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 wikiPageRevisionID "570487891".
- Four-channel_Compact_Disc_Digital_Audio hasPhotoCollection Four-channel_Compact_Disc_Digital_Audio.
- 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 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 label "四軌音訊CD".
- Four-channel_Compact_Disc_Digital_Audio sameAs m.0679bx.
- Four-channel_Compact_Disc_Digital_Audio sameAs Q8565048.
- Four-channel_Compact_Disc_Digital_Audio sameAs Q8565048.
- Four-channel_Compact_Disc_Digital_Audio wasDerivedFrom Four-channel_Compact_Disc_Digital_Audio?oldid=570487891.
- Four-channel_Compact_Disc_Digital_Audio isPrimaryTopicOf Four-channel_Compact_Disc_Digital_Audio.