Method for determining optimum recording condition and optical recording/reproducing apparatus using the same
AssigneeLite-On It Corporation
InventorChia-Yen Chang
Life of this patent
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Abstract
A method for determining an optimum recording condition of an optical recording/reproducing apparatus is used for recording data into an optical disc. Data is first written into a plurality of test regions of the optical disc under a plurality of recording conditions, respectively. The data written into the plurality of test regions are converted into radio-frequency (RF) signals. The RF signals are Viterbi-decoded to obtain corresponding path metric increase rates. The path metric increase rates are used to determine an optimum recording condition.
Claims20
A method for determining an optimum recording condition of an optical recording/reproducing apparatus for recording data into an optical disc, comprising steps of:
- writing data into a plurality of regions of the optical disc under a plurality of recording conditions, respectively;
- converting said data written into said plurality of regions into radio-frequency (RF) signals;
- Viterbi-decoding said RF signals to obtain corresponding path metric increase rates;
- and
- determining an optimum recording condition according to said path metric increase rates.
A method for determining recording quality of an optical recording/reproducing apparatus, comprising steps of:
- reading a first RF signal and a second RF signal from the optical disc;
- Viterbi-decoding said first RF signal and said second RF signal to obtain a first path metric increase rate and a second path metric increase rate, respectively;
- and
- comparing said first path metric increase rate and said second path metric increase rate and determining one of said first and second RF signals resulting in a smaller path metric increase rate to be better in recording quality.
An optical recording/reproducing apparatus for recording data into an optical disc, comprising:
- an optical head for writing data into the optical disc and reading and outputting data from the optical disc as an RF signal;
- and
- a Viterbi-decoder electrically connected to said optical head for decoding said RF signal to recover said data recorded in the optical disc, said Viterbi-decoder comprising a path metric value storage unit and a path metric overflow flag coupled to said path metric value storage unit, and generating a path metric value of said RF signal in a specified Viterbi-decoding procedure,
- wherein said data subjected to said specified Viterbi-decoding procedure is previously recorded into the optical disc under a specified recording condition in a specified data writing procedure, said path metric value of said RF signal is updated and stored in said path metric value storage unit, said path metric overflow flag rises whenever said path metric value stored in said path metric value storage unit exceeds a threshold, and said optical recording/reproducing apparatus determines whether a subsequent data writing procedure is to be performed under said specified recording condition according to a rising count of said path metric overflow flag within a specified time period.
Dependencies are inferred from the claim text.