More than thirty years later, American inventor James T. The optophone, first presented in 1931, was an early device which used light for both recording and playback of sound signals on a transparent photograph.

1.1 Digital audio laser-disc prototypes.

According to the RIAA's midyear report in 2020, phonograph record revenues surpassed those of CDs for the first time since the 1980s. In the 2010s, revenues from digital music services, such as iTunes, Spotify, and YouTube, matched those from physical format sales for the first time. had dropped about 50% from their peak however, they remained one of the primary distribution methods for the music industry. īeginning in the 2000s, CDs were increasingly being replaced by other forms of digital storage and distribution, with the result that by 2010 the number of audio CDs being sold in the U.S. The format gained worldwide acceptance in 1983–84, selling more than a million CD players in those two years, to play 22.5 million discs. The first commercially available audio CD player, the Sony CDP-101, was released October 1982 in Japan. The standard is defined in the Red Book, one of a series of Rainbow Books (named for their binding colors) that contain the technical specifications for all CD formats.

High-Definition Versatile Multilayer Disc (HD VMD)Ĭompact Disc Digital Audio ( CDDA or CD-DA), also known as Digital Audio Compact Disc or simply as Audio CD, is the standard format for audio compact discs.

HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM.Blu-ray Disc ( BD): BD-R & BD-RE, Blu-ray 3D, Mini Blu-ray Disc.

DVD: DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-R DS, DVD+R DS, DVD-RW, DVD+RW, DVD-RAM, DVD-D, DVD-A, HVD, EcoDisc, MiniDVD.

Compact disc ( CD): CD-DA, CD-ROM, CD-R, CD-RW, 5.1 Music Disc, Super Audio CD ( SACD), Photo CD, CD Video ( CDV), Video CD ( VCD), Super Video CD ( SVCD), CD+G, CD-Text, CD-ROM XA, CD-i, MIL-CD, Mini CD.

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