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compact disc digital audio (CD-DA)

The CD- DA(Compact DiscDigitalAudio) process, introduced by Philips and Sony in 1982, was later codified in the Red Book. In the meantime, it has also been standardized by the International Electrotechnical Commission( IEC) under IEC-908.

Audio sequences up to 74 minutes in length can be stored in HiFi quality on the 12 cm compact disc. The storage capacity is 747 MB, and storage is in PCM technology with a sampling depth of 16 bits and a sampling rate of 44.1 kHz. At this resolution, the signal-to- noise ratio is 96.3 dB. The CD-DA's user data is encoded in the EFM code, Eight to Fourteen (EFM). For one second of audio in HiFi quality, 1.5 Mbit is required. In addition, the CD-DA standard supports the CIRCerror correctionmethod, which detects and corrects read errors.

CD family

CD family

The CD-DA is structured in sectors, each sector containing 98 data frames, each frame consisting of 588 bits. The 588 channel bits are divided into 24 synchronization bits, 8 bits for the sub-code, 96 data bits followed by 32 parity bits. The combination of data and parity bits repeats several times. The entire frame is 1/7.35 ms long and occupies 0.163 mm on the compact disc.

The data transfer rate of an audio CD player results from the playback rate of 75 sectors per second to a data transfer rate of 540 kB/s or 4.32 Mbit/s. Addressing by time code is done in minutes, seconds and sectors. The CD-DA works with constant rotation speed, Constant Linear Velocity( CLV), and has a maximum rotation speed of 568 rpm, the minimum is 200 rpm.

Informations:
Englisch: compact disc digital audio - CD-DA
Updated at: 24.01.2013
#Words: 242
Links: call deflection (ETSI) (CD), dielectric absorption (DA), process, indium (In), international electrotechnical commission (IEC)
Translations: DE
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