Digitalized

Digitalized: A visual representation of the evolution of audio format 1877 1883 Phonograph Cylinder Music Roll These cylinder shaped objects had an audio recording engraved on the outside surface which could be reproduced when the cylinder was played on a mechanical phonograph. A roll of paper with perforations (holes) punched in it. The position and length of the perforation determines the note played on the piano. 01895 1930s Gramophone record Reel-to-Reel An analogue sound storage medium consisting of a flat disc with an inscribed, modulated spiral groove. The groove usually starts near the periphery and ends near the center of the disc. A form of magnetic tape recording which is held on an open reel. The reel is mounted on a spindle while the tape is pulled through mechanical guides and a tape head assembly. A second takeup reel collects the played tape. 91963 1965 Compact Cassette 8-Track Consist of two miniature spools, between which a magnetically coated plastic tape is passed and wound. These spools are held inside a protective plastic shelI. A magnetic tape sound recording technology. It was a further development of the similar Stereo-Pak four-track cartridge created by Earl "Madman" Muntz. 1982 1993 Compact Disc MP3 An optical disc used to store digital data. Standard CDs have a diameter of 120 millimetres (4.7 in) and can hold up to 80 minutes of uncompressed audio (700 MB of data). Greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners. 01997 2006 DVD Blu-ray Disc An optical disc storage media format, invented and developed by Philips, Sony, Toshiba, and Time Warner. Its main uses are video storage and is capable of storing just under seven times as much data as the CD. An optical disc storage medium designed to supersede the DVD format. Blu-ray Discs contain 25 GB per layer, with dual layer discs (50 GB) the norm for feature-length video discs and additional layers possible in the future.