| 摘要 |
A signal-to-noise ratio measurement apparatus for a signal read from an optical disc comprises a storage unit for storing an input signal read from an optical disc; an index signal detection unit for detecting an index signal enabling repetition signals to be identified, the repetition representing an input signal that is continuously repeated in a certain interval; and a calculation unit for reading the repetition signals stored in the storage unit based on the index signal, detecting an original signal indicating an average value of the repetition signals, detecting noise contained in the repetition signals based on a difference value between the original signal and the repetition signals, and calculating a signal-to-noise ratio of the input signal based on the original signal and noise. Accordingly, the apparatus measures the quality of an optical disc by calculating a signal-to-noise ratio of an input signal continuously repeated, thereby enabling the quality of the optical disc to be measured even when jitter can not be detected due to the high recording density of the optical disc.
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