发明名称 |
Recording clock generating device and method thereof |
摘要 |
Crosstalk between tracks, land prepit leakage, and effects of recording power modulation can cause the wobble signal period to change irregularly, producing jitter in the recording clock derived by frequency multiplying the wobble signal. This problem is resolved by a recording clock generating circuit having an arrangement to average the wobble signal period, a timer for generating a rectangular wave with substantially the same period as the average period, and a frequency multiplying PLL for multiplying timer output. The period averaging arrangement in particular determines the approximate average period at every wobble period and reflects the phase difference between the wobble signal and timer in the timer setting to improve recording clock stability.
|
申请公布号 |
US2002110059(A1) |
申请公布日期 |
2002.08.15 |
申请号 |
US20010983977 |
申请日期 |
2001.10.26 |
申请人 |
USUI MAKOTO;DEGUCHI HIRONORI;OCHI TAKAHIRO;UEKI YASUHIRO;OHTA MITSUHIKO;OSADA YUTAKA |
发明人 |
USUI MAKOTO;DEGUCHI HIRONORI;OCHI TAKAHIRO;UEKI YASUHIRO;OHTA MITSUHIKO;OSADA YUTAKA |
分类号 |
G11B7/0045;G11B7/007;G11B20/14;G11B27/19;G11B27/24;G11B27/30;H03L7/18;(IPC1-7):G11B7/004 |
主分类号 |
G11B7/0045 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|