| 摘要 |
PROBLEM TO BE SOLVED: To reduce influence of noise generated when playing back HFM grooves. SOLUTION: An A/D conversion circuit 42 performs A/D conversion of an RF signal obtained by irradiating the HFM grooves with light every time a wck3 is supplied from the wobble PLL section 32 and outputs to an adder 61. According to control of a mute circuit 63, the adder 61 integrates signals of an integration section by accumulating signal values every time sampling clock is supplied for signals of range established as an integration section among signals corresponding to 0.5 bits of disk data supplied from the A/D conversion circuit 42. Values added by the adder 61 are supplied to an accumulator 62. When integration of the integration section is completed, a resister 53 supplies the values stored in the accumulator 62 to an address ECC decoder circuit 24. COPYRIGHT: (C)2006,JPO&NCIPI
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