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On some picture discs, the images used were meant to create an optical illusion while the record was rotating on the turntable (as in the B side of Curved Air's Airconditioning), while others used the visual effect to add to the music — for example, the 1979 picture disc of Fischer-Z's The Worker featured a train which endlessly commuted ...
The LP (from long playing [2] or long play) is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33 + 1 ⁄ 3 rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.
Videodisc (or video disc) is a general term for a laser- or stylus-readable random-access disc that contains both audio and analog video signals recorded in an analog form. Typically, it is a reference to any such media that predates the mainstream popularity of the DVD format.
An audio format is a medium for sound recording and reproduction.The term is applied to both the physical recording media and the recording formats of the audio content—in computer science it is often limited to the audio file format, but its wider use usually refers to the physical method used to store the data.
When a disc began to wear, video and audio quality would severely decline, and the disc would begin to skip. [20] Several discs suffered from a condition called "video virus", where a CED would skip a great deal due to dust particles stuck in the grooves of the disc. However, playing the disc several times would generally solve this problem. [21]
Techno artist Jeff Mills released the single for "The Occurrence" on a disc that is a gramophone record on one side, and a compact disc on the other. Although dubbed a 5-inch record, to be usable in most compact disc players, the record can be no bigger than 120 mm or about 4.7". [5] 5 in (13 cm)
Professionals record at 30 ips on 3600 ft reels that will fit 22.5 minutes (one side only). A 3600 ft reel can hold up to 48 hours if recorded in mono (4 sides) at 15/16 ips. Compact disc: Digital Earlier discs: up to 74 minutes (or up to 650 MB of data files) Later discs: up to 80 minutes (or up to 700 MB of data files) Recordable discs: Digital
This form of optical disc was a very early form of the DVD (U.S. patent 3,430,966). It is of special interest that U.S. patent 4,893,297, filed 1989, issued 1990, generated royalty income for Pioneer Corporation's DVA until 2007 —then encompassing the CD, DVD, and Blu-ray systems. In the early 1960s, the Music Corporation of America bought ...