Method for determining a difference between a sub-Q code and a h

Details Method for determining a difference between a sub-Q code and a h Method for determining a difference between a sub-Q code and a h

1997-03-17

1999-08-10

Swann, Tod R.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 56, 369 84, 369 83, G11B 700

Patent

active

059369175

ABSTRACT:
A method for determining the difference between the sub-Q code and header of a CD-ROM loaded in a CD-ROM drive is provided. The method includes the providing a read-out command to a controller in the CD-ROM drive, searching for a sub-Q code area of a first frame and reading the sub-Q code of the sub-Q code area according to the read-out command and storing the same, by means of the controller, enabling a decoder in the CD-ROM drive and reading header information which is the primary output from the decoder, by means of the controller, calculating the difference between the stored sub-Q code and the stored header information, by means of the controller, and processing the difference and transmitting the result, by means of the controller. Here, the result is processed in a computer and displayed on a monitor connected to the computer. Accordingly, it is possible to determine the influence of the recording structure of the CD-ROM on access time, thereby allowing steps to be taken to improve the quality and reliability of the CD-ROM.

REFERENCES:
patent: 4949323 (1990-08-01), Yoshida
patent: 5175716 (1992-12-01), Min
patent: 5574704 (1996-11-01), Shimosaka

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