Method and apparatus for testing quality of an optical disk medium
AssigneeLG Electronics Inc.
InventorsDae-Young Kim, Woon-Seong Yeo, Dong-Seok Bae, Hyung-Kyu Kim
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Abstract
The method and apparatus for testing quality of an optical disk medium reproduce an auxiliary signal from an optical disk wherein the auxiliary signal corresponds to a preformatted structure of the optical disk. The quality of the optical disk is then determined based on the auxiliary signal.
Claims44
A method of testing optical disk quality, comprising:
- reproducing an auxiliary signal from an optical disk, said auxiliary signal corresponding to a preformatted structure of said optical disk;
- storing a predetermined range corresponding to said optical disk;
- comparing said auxiliary signal to said predetermined range;
- and
- judging said disk quality of said optical disk based on said comparison.
A method of testing optical disk quality, comprising:
- reproducing an auxiliary signal from an optical disk, said auxiliary signal corresponding to a preformatted structure of said optical disk;
- storing predetermined tolerance ranges corresponding to a plurality of different optical disk types;
- selecting one of said predetermined tolerance ranges corresponding to a type of said optical disk;
- comparing said auxiliary signal to said selected predetermined tolerance range;
- and
- judging said disk quality of said optical disk based on said comparison.
A method of testing optical disk quality, comprising:
- reproducing an auxiliary signal from an optical disk, said auxiliary signal corresponding to a preformatted structure of said optical disk;
- determining whether a carrier-to-noise ratio of said auxiliary signal is greater than a predetermined threshold;
- and
- generating a good quality signal if said carrier-to-noise ratio is determined to be greater than said predetermined threshold.
An apparatus for testing optical disk quality, comprising:
- reproducing means for reproducing an auxiliary signal from an optical disk, said auxiliary signal corresponding to a preformatted structure of said optical disk;
- and
- a memory storing a predetermined range corresponding to said optical disk;
- a processor comparing said auxiliary signal to said predetermined range, and judging said quality of said optical disk based on said comparison.
An apparatus for testing optical disk quality, comprising:
- reproducing means for reproducing an auxiliary signal from an optical disk, said auxiliary signal corresponding to a preformatted structure of said optical disk;
- a controller outputting a disk type signal indicating a type of said optical disk;
- and wherein
- said determining means includes,
- a memory storing predetermined tolerance ranges corresponding to a plurality of different optical disk types, and outputting one of said predetermined tolerance ranges based on said disk type signal, and
- a processor comparing said auxiliary signal to said output predetermined tolerance range, and judging said quality of said optical disk based on said comparison.
An apparatus for testing optical disk quality, comprising:
- reproducing means for reproducing an auxiliary signal from an optical disk, said auxiliary signal corresponding to a preformatted structure of said optical disk;
- determining means for determining whether a carrier-to-noise ratio of said auxiliary signal is greater than a predetermined threshold, and for generating a good quality signal if said carrier-to-noise ratio is determined to be greater than said predetermined threshold.
Dependencies are inferred from the claim text.