High Capability Error Correction LSI for CD Player and CD Rom

The CD-ROM Drive

“…The dimensions of both views are stylistically represented 12 2. 2 Two typical optical paths used in CD-ROM drives 14 2. 3 The laser spot and its light intensity 15 2.4 Zeroth and first diffraction orders generated in transmissive read-out by the pit/land grating structure, oriented along the disc spiral 17 2.5 Modulation transfer function for central aperture detection 18 2.6 Beam focusing upon the disc impressed surface 19 2.7 Typical arrangement and focus error signal for the astigmatic ( 4-detector) method 20 2.…”

“…1 Subcode format and Q-channel structure 95 6. 2 Basic formats of CD-ROM data 97 6.3 Block diagram of a CD-ROM block decoder 99 6.4 The sync, header and user data rearranged by the input interface (A), descrambling linear-feedback shift register (B), and…”

“…Overspeed profile and corresponding data availability, the angular velocity of the turntable motor, and the components of Glossary loss in optical energy (absorption coefficient) per unit length within a laser diode or photodiode, in m-I difference between energy levels in a photonic device, in e V number of tracks crossed during a seek action average number of tracks crossed during a seek action distance between the disc center of gravity and the rotation axis, in mm average seek length, in s low-frequency sensitivity of the focus loop low-frequency sensitivity of the radial loop focal depth, in ",m spatial frequency for the MTF, in lines / ",m or ",m-I quantum efficiency of a photonic emitting device recording efficiency external quantum efficiency of a photo detector internal quantum efficiency of a photo detector angle between the direction of the zeroth order and the direction normal to the incidence plane, in rad reflection angle inside the resonator of a laser diode, in rad angle between the direction of the mth order and the direction normal to the incidence plane, in rad wavelength of the laser light, in nm damping ratio of a second-order system time constant, in s electrical time constant, in s lifetime of excess holes in the n-region of a photodiode, in s <Pm r «Pspot 'l/JlO phase margin of a control loop, in rad confinement factor within a semiconductor laser diameter of the laser spot, in /lm xxi phase shift between zeroth and first diffracted orders, in rad angular frequency, in rad/s disc angular frequency, in rad/s Notational conventions (2,10) 3T B(Sx) Cl …”

Cd-Rom Image Retrieval System

“…But there must be the following problems: 1) Stroke representation of images causes the increase of data processing time. 2) Bit map representation of images causes the increase of data volume. 3) Old documents are kept in the form of hardcopy or micro -fishe / micro -film.…”

“…1) Reliability improvement of CD -ROM system. 2) Effective image compression and expanssion method /equipment. 3) Fast and high resolutional image display and print method /equipment.…”