Capacitance Electronic Disc - Advantages of CEDs

Advantages of CEDs

CED players, from an early point in their life, appealed to a lower-income market more than VHS, Betamax, and Laserdisc. The video quality (approximately 3 MHz of luma bandwidth for CED) was comparable to a VHS-SP or Betamax-II video, but sub-par compared to Laserdisc (about 5 MHz of luma bandwidth).

CED players were intended to be "low-cost". Because they have fewer precision parts than a VCR, a CED player cost, at most, about half as much to manufacture. The discs themselves could be inexpensively duplicated, stamped out on slightly-modified audio gramophone record presses.

Like VCRs, CED videodisc players had features like rapid forward/reverse and visual search forward/reverse. They also had a pause feature, though it blanked the screen rather than displaying a still image; many players featured a 'page mode' during which the current block of four successive frames would be repeatedly displayed.

Since CEDs were a disc-based system, they did not require rewinding. Early discs were generally monaural, but later discs included stereo sound. (Monaural CED disks were packaged in white protective caddies while stereo disks were packaged in blue protective caddies.) Other discs could be switched between two separate mono audio tracks, providing features such as bilingual audio capability.

Like the Laserdisc and DVD, some CEDs feature random access and that users can quickly move to certain parts of the movie. Each side of a CED disc could be split into up to 63 "chapters", or bands. Two late RCA players (the SJT400 and SKT400) could access these bands in any given order. Unlike its laser-based counterparts, the chapters in a CED are based on minutes of the film, not scenes.

Novelty discs and CED-based games were produced whereby accessing the chapters in a specified order would string together a different story each time. However, only a few were produced before the halt of CED player manufacturing.