Optical disk recording/playback apparatus and optical disk evaluation method using a temporary memory
AssigneeSanyo Electric Co., Ltd.
InventorsHidemitsu Senoo, Tomonori Kamiya, Yuichiro Tsukamizu
Life of this patent
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Abstract
A counter 11 continuously reads in the EFM signal from a binarizing circuit 4, resets its count value each time the polarity of the EFM signal changes, counts counter clocks higher in frequency than the EFM signal during each EFM period of the EFM signal, and transfers the count values to a FIFO 12 sequentially. The FIFO 12 temporarily stores the count values transferred, and writes a predetermined number of count values into a buffer RAM 7 in a batch each time the predetermined number of count values are stored.
Claims13
An optical disk recording/playback apparatus which illuminates an optical disk with laser light, receives the laser light modulated by pits or marks recorded on the optical disk, and converts the light amount of the received laser light into an electrical signal, thereby obtaining a reproduced signal and evaluating the optical disk, comprising:
- a counter that counts counter clocks of high frequency during periods of a series of binary values produced from the reproduced signal by a binarizing circuit;
- and
- a temporary memory that temporarily stores a plurality of count values of the counter and transfers the plurality of count values stored to a measured data store area of a buffer RAM in a batch.
An optical disk evaluation method to illuminate an optical disk with laser light, receive the laser light modulated by pits or marks recorded on the optical disk, and convert the light amount of the received laser light into an electrical signal, thereby obtaining a reproduced signal and evaluating the optical disk, comprising:
- counting, by a counter, counter clocks of high frequency during periods of a series of binary values produced from the reproduced signal by a binarizing means;
- and
- temporarily storing a plurality of count values of the counter in a temporary memory and transferring the plurality of count values stored to a measured data store area of a buffer RAM in a batch.
Dependencies are inferred from the claim text.