Disc-shaped information carrier provided with two portions havin

Details Disc-shaped information carrier provided with two portions havin Disc-shaped information carrier provided with two portions havin

1998-05-18

1999-12-21

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, G11B 724

Patent

active

060058374

ABSTRACT:
A disc-shaped information carrier with a substrate and an information layer which includes optically readable elementary marks having a substantially uniform density. The information layer includes a first portion suitable for being read out at a first read-out speed and a second portion suitable for being read out at a second read-out speed higher than the first read-out speed. According to the invention, the second portion of the information layer is at a greater distance to a center of the disc-shaped information carrier than is the first portion of the information layer. A range of rotational speeds which an optical read-out unit must have for a full and correct read-out of the information carrier is reduced in this manner. In a special embodiment, the first portion of the information layer includes a first version of an audio recording provided on the information layer by the DSD transformation method, whereas the second portion of the information layer includes a second version of this same audio recording provided on the information layer by the PCM transformation method.

REFERENCES:
patent: 5142521 (1992-08-01), Terashima et al.
patent: 5343452 (1994-08-01), Maeda et al.
patent: 5345435 (1994-09-01), Yamasaki
patent: 5373498 (1994-12-01), Tagiri
patent: 5446724 (1995-08-01), Tabe et al.
patent: 5485448 (1996-01-01), Kishi et al.

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