CD player in 1970. Following litigation, Sony and Philips licensed Russell's patents (then held by a Canadian company, Optical Recording Corp.) in the 1980s. The Compact Disc is an evolution of LaserDisc technology, where a focused laser beam is used that enables the high information density required for high-quality digital audio signals. Prototypes were developed by Philips and Sony independently in the late 1970s. In 1979, Sony and Philips set up a joint task force of engineers to design a new digital audio disc. After a year of experimentation and discussion, the "Red Book" CD-DA standard was published in 1980. After their
Over the Edge Vol. 4: Dick Vaughn's Moribund Music of the '70s 1990 by SST Records on cassette only, it was re-released in 2001 by Negativland's own label, Seeland Records, as a CD. The CD version contains material not included on the original release, and also omits and rearranges some material from the original. DISC ONE DISC TWO Over the Edge Vol. 4: Dick Vaughn's Moribund Music of the '70s Dick Vaughn's Moribund Music Of The '70s is a collection of recordings edited from a wealth of material broadcast on KPFA's "Over the Edge" radio show, hosted by Don Joyce weekly and featuring members of Negativland, as well as material recorded at