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・ Compact car
・ Compact cardinal
・ Compact Cassette
・ Compact City
・ Compact closed category
・ Compact complement topology
・ Compact convergence
・ Compact dimension
・ Compact disc
・ Compact Disc + Extended Graphics
・ Compact Disc and DVD copy protection
・ Compact Disc bronzing
・ Compact Disc Digital Audio
・ Compact Disc File System
・ Compact Disc manufacturing
Compact Disc subcode
・ Compact Disco
・ Compact Disk Dummies
・ Compact element
・ Compact excavator
・ Compact executive car
・ Compact finite difference
・ Compact fluorescent lamp
・ Compact Forest Proposal
・ Compact government
・ Compact group
・ Compact intracloud discharge
・ Compact Kinetic Energy Missile
・ Compact Lie algebra
・ Compact Linear Collider


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Compact Disc subcode : ウィキペディア英語版
Compact Disc subcode

Subcode or subchannel data (called "control bytes" in the CD-ROM specification) refers to data contained in a compact disc (CD) in addition to digital audio or user data, which is used for control and playback of the CD. The original specification was defined in the Red Book standard for CD Digital Audio, though further specifications have extended their use (including the CD-ROM, CD Text and CD+G specifications).
== Structure ==
Subchannel data is multiplexed with the digital audio or user digital data. The data in a CD are arranged in frames. A frame comprises 33 bytes, of which 24 bytes are audio or user data, eight bytes are error correction (CIRC-generated), and one byte is for subcode. Frames are arranged in sectors, which contain 98 frames each. The subcode bytes of the first two frames of a sector are used as two synchronization words. The subcode bytes of the remaining 96 frames of a sector are split into eight 96-bit long subcode channels (also called subchannels or simply channels) by putting together the nth bit of each subcode byte. Each channel has a bit rate of 7.35 (=44.1/6) kbit/s.
Each subcode bit/subchannel is designated by a letter from P to W. The following diagram illustrates how the channels are laid out:〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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