Optical disc system for digital video recording

We have developed a new error correction method (Picket: a combination of a long distance code (LDC) and a burst indicator subcode (BIS)), a new chann el modulation scheme (17PP. or (1, 7) RLL parity preserve (PP)-prohibit rep eated minimum transition runlength (RMTR) in full), and a new address forma t (zoned constant angular velocity (ZCAV) with headers and wobble, and prac tically constant linear density) for a digital video recording system (DVR) using a phase change disc with 9.2 GB capacity with the use of a red (lamb da = 650 nm) laser and an objective lens with a numerical aperture (NA) of 0.85 in combination with a thin cover layer. Despite its high density, this new format is highly reliable and efficient. When extended for use with bl ue-violet (lambda approximate to 405 nm) diode lasers, the format is well s uited to he the basis of a third-generation optical recording system with o ver 22 GB capacity on a single layer of a 12-cm-diameter disc.