发明名称 |
Programmable PPM/PWM writing system for optical disk |
摘要 |
A programmable writing system for an optical disk drive which is adaptable for pulse position modulation (PPM) and pulse width modulation (PWM) pulse generation. The writing circuit is responsive to a PPM/PWM mode command for generating programmed laser pulse signals. Specifically, a pattern detector is responsive to the PPM/PWM mode command for detecting input data. The detected data is provided to a pulse selector for selecting programmed pulse power and/or duration values, which operate a pulse generator to set pulse power levels and/or to set the duration of the generated laser pulse signals. In PWM mode, the pattern detector provides a toggle signal with each detected signal and the pulse selector responds to the toggle signal to alternate between providing mark pulse power and/or duration values and providing space duration values to thereby provide alternating mark and space signals.
|
申请公布号 |
US5802031(A) |
申请公布日期 |
1998.09.01 |
申请号 |
US19970972467 |
申请日期 |
1997.11.18 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
CLARK, ALAN ROBERT;HUTCHINS, ROBERT ALLEN |
分类号 |
G11B7/00;G11B7/0045;G11B7/125;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|