System and method for recognizing the digital video disk style

A technology for identifying numbers and optical discs, which is applied to the recording of information on the magnetic disc, data recording, instruments, etc. It can solve the problems of inaccurate estimation, large difference in frequency values, and inability to burn correctly.

CN101055743AInactive Publication Date: 2007-10-17BENQ CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2007-10-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for identifying type of a digital video signal optical disk is suitable for being used in a digital optical disk recorder, the method comprises firstly reading data on the digital video signal optical disk, calculating a pendular amplitude value and a maximal amplitude value by using the readed optical data. Then, judging whether a difference value between the pendular amplitude value and the maximal amplitude value is larger than a predetermined difference value. When the difference value is larger than the predetermined difference value, the digital video signal optical disk is judged as a first type. When the difference value is less than the predetermined difference value, the digital video signal optical disk is judged a seond type.
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Description

technical field

[0001] The invention relates to a method for identifying the type of an optical disc, in particular to a method for identifying the type of a digital video disc. Background technique

[0002] The current recordable (recordable) digital video disc (DVD) is mainly divided into two specification systems. One is the digital video disc specification formulated by the DVD Forum. For example, it can be burned once. The recordable digital video disc (DVD-R) and the rewritable digital video disc (DVD-RW) that can be burned many times, hereinafter referred to as the first type. The second is the digital video disc specification mainly formulated by the DVD Alliance, such as a recordable digital video disc (DVD+R) that can be burned once and a rewritable disc that can be burned many times. Recording type digital video disc (DVD+RW), hereinafter referred to as the second type of these two specifications.

[0003] As far as a DVD recorder is concerned, in order to effec...

Examples

Embodiment Construction

[0024] Please refer to FIG. 2 . FIG. 2 is a flowchart showing the execution of the method disclosed in the present invention. In one embodiment, the present invention provides a method for identifying the type of a DVD, which can be used in a DVD recorder to identify different types of DVDs.

[0025] First, read the optical data on the DVD (step S200). Then use the read optical data to calculate the swing amplitude value and the maximum amplitude value (step S202). The optical data on the digital video disc is produced by a read-write device, such as a read-write head, through optical projection, acting on the digital video disc. The optical data may include a drag normalized signal (PPN), which can be calculated as follows:

[0026] PPN=G1×(A+B)-G2×(C+D), in this formula, PPN is the drag normalization signal, (A+B) is the first area data of the digital video disc, (C+D ) is the second region data of the DVD, and G1 and G2 are adjustment constants.

[0027] Please refer to...