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Browse Prior Art Database

Application Transparent 2X Data Rate CD-ROM Drive

IP.com Disclosure Number: IPCOM000109347D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Smolen, M: AUTHOR

Abstract

Disclosed is a design architecture for CD-ROM drives which can transmit data at twice the standard rate. Certain existing CD-ROM applications expect data to be transferred at the standard data rate while other applications can take advantage of the 2X data rate but do not have the ability to switch to the higher data rate. The design of 2X data rate CD-ROM drives can be implemented in such a fashion as to default to the optimum data rate for the application.

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Application Transparent 2X Data Rate CD-ROM Drive

       Disclosed is a design architecture for CD-ROM drives
which can transmit data at twice the standard rate.  Certain existing
CD-ROM applications expect data to be transferred at the standard
data rate while other applications can take advantage of the 2X data
rate but do not have the ability to switch to the higher data rate.
The design of 2X data rate CD-ROM drives can be implemented in such a
fashion as to default to the optimum data rate for the application.

      CD-ROM drives can transmit information in three basic modes:
Mode 1, which is a data/text mode, Mode 2, which primarily is used
for audio and video information, and Compact Disc-Digital Audio
(CD-DA) mode, which is the standard digital audio mode found on
consumer compact disc players.  One of the three modes is selected by
issuing an appropriate command to the CD-ROM drive.

      Mode 1 data contains an Error Correction Code (ECC) for
correcting errors detected in the data.  Since the error correction
process is not always accomplished in real time, applications which
use this mode are not dependent on a specific data rate.
Applications using this mode can therefore take advantage of the 2X
data rate.  Existing applications, however, may not have the ability
to select the higher data rate.  A 2X data rate CD-ROM drive can be
designed to default to the 2X data rate when Mode 1 is selected,
thereby providing the advantages of the higher d...