Programmable PPM/PWM writing system for optical disk

Details Programmable PPM/PWM writing system for optical disk Programmable PPM/PWM writing system for optical disk

1997-11-18

1998-09-01

Hindl, Nabil

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369124, 369116, G11B 700

Patent

active

058020314

ABSTRACT:
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.

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