Compact Disc Topics

• Disc
• Audio
• Music
• Cds
• Dvd
• Compact
• Light
• Album

Related Images

Source

del.icio.us Tags

• cd
• tech
• signalquality
• it101gmu
• data
• sampling
• samplerate
• cdproject
• 25-year-cd
• music
• storage
• technology
• disk
• compact
• wikipedia
• powerpoint
• beyondbones
• lookingback
• sciencehistory
• hmnsblog
• cd-format

Compact Disc, Compact Disc

Only later did the concept of an "audio file" arise, and the generalising of this to any data file. From its origins as a music format, Compact Disc has grown to encompass other applications. In June 1985, the CD-ROM (read-only memory) and, in 1990, CD-Recordable were introduced, also developed by Sony and Philips.

When the Sony/Philips task force designed the Compact Disc, Philips had already developed a 14-bit D/A converter, but Sony insisted on 16-bit. In the end, 16 bits and 44.1 kilosamples per second prevailed. Philips found a way to produce 16-bit quality using their 14-bit DAC by using four times oversampling.

However, in 1985 the Yellow Book CD-ROM standard was established by Sony and Philips, which defined a non-volatile optical data computer data storage medium using the same physical format as audio compact discs, readable by a computer with a CD-ROM drive.

One major drawback to these copy-protected discs is that most will not play on computer CD-ROM drives, as well as some standalone CD players that use CD-ROM mechanisms. Philips has stated that such discs are not permitted to bear the trademarked Compact Disc Digital Audio logo because they violate the Red Book specification. Numerous copy-protection systems have been countered by readily-available, often free, software.

Source: Wikipedia > Compact Disc