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This HTML5 document contains 49 embedded RDF statements represented using HTML+Microdata notation.

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Statements

Subject Item: dbr:Compact_disc
dbo:wikiPageWikiLink: dbr:Four-channel_Compact_Disc_Digital_Audio

Subject Item: dbr:Surround_sound
dbo:wikiPageWikiLink: dbr:Four-channel_Compact_Disc_Digital_Audio

Subject Item: dbr:Four-channel_Compact_Disc_Digital_Audio
rdfs:label: Four-channel Compact Disc Digital Audio
rdfs: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 mode to accommodate full periphony Ambisonic UHJ format, also known as PHJ or C-format, and not to be confused with the older inferior Quadraphonic four channel discrete surround format which had already failed in the marketplace.
dcterms:subject: dbc:Compact_disc dbc:Audio_storage dbc:Japanese_inventions dbc:Quadraphonic_sound
dbo:wikiPageID: 1935390
dbo:wikiPageRevisionID: 1114369227
dbo:wikiPageWikiLink: dbc:Quadraphonic_sound dbc:Compact_disc dbr:Red_Book_(CD_standard) dbr:Pulse-code_modulation dbc:Audio_storage dbr:5.1_Music_Disc dbr:Quadraphonic dbr:Dolby_Pro_Logic dbr:Compact_Disc dbr:Data_compression dbc:Japanese_inventions dbr:Ambisonic_UHJ_format dbr:Multitrack_recording dbr:Surround_sound dbr:Sony dbr:Philips dbr:International_Electrotechnical_Commission dbr:Matrix_(sound_recording) dbr:Super_Audio_CD
dbo:wikiPageExternalLink: n12:kDRAudioFourChannelKey
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dbp:wikiPageUsesTemplate: dbt:Compact_disc dbt:Use_mdy_dates dbt:Reflist
dbo: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 mode to accommodate full periphony Ambisonic UHJ format, also known as PHJ or C-format, and not to be confused with the older inferior Quadraphonic four channel discrete surround format which had already failed in the marketplace. 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, fewer bits per sample, or compression). Alternatively, the "four-channel" bit could have been used merely to indicate the presence of a matrix-encoded recording, for example Dolby Pro Logic. 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.
prov:wasDerivedFrom: wikipedia-en:Four-channel_Compact_Disc_Digital_Audio?oldid=1114369227&ns=0
dbo:wikiPageLength: 3932
foaf:isPrimaryTopicOf: wikipedia-en:Four-channel_Compact_Disc_Digital_Audio

Subject Item: dbr:Quadraphonic_sound
dbo:wikiPageWikiLink: dbr:Four-channel_Compact_Disc_Digital_Audio

Subject Item: dbr:Four-channel_compact_disc_digital_audio
dbo:wikiPageWikiLink: dbr:Four-channel_Compact_Disc_Digital_Audio
dbo:wikiPageRedirects: dbr:Four-channel_Compact_Disc_Digital_Audio

Subject Item: dbr:Four_Channel_Compact_Disc_Digital_Audio
dbo:wikiPageWikiLink: dbr:Four-channel_Compact_Disc_Digital_Audio
dbo:wikiPageRedirects: dbr:Four-channel_Compact_Disc_Digital_Audio

Subject Item: dbr:Four_channel_compact_disc_digital_audio
dbo:wikiPageWikiLink: dbr:Four-channel_Compact_Disc_Digital_Audio
dbo:wikiPageRedirects: dbr:Four-channel_Compact_Disc_Digital_Audio

Subject Item: wikipedia-en:Four-channel_Compact_Disc_Digital_Audio
foaf:primaryTopic: dbr:Four-channel_Compact_Disc_Digital_Audio