Optical Storage Controller Pulse Length Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional write pulse transmission in optical storage apparatuses, such as optical disc drives, faces challenges with signal degradation due to flex cable limitations, particularly during high-speed data recording, where the minimum transmission pulse width is shorter than the cable's capacity, leading to poor signal quality and inaccurate control of laser pulses.
Innovation Solution
A controller and method that generate control signals with a minimum transmission pulse length corresponding to more than one power symbol period, using a code generator to determine control codes representing power levels and deliver them via control signals, ensuring no short transmission pulses are sent, thus alleviating signal degradation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the minimum transmission pulse width is reduced to meet high-speed data recording requirements, then the recording speed is improved, but the signal transmission quality deteriorates due to flex cable limitations
Solution Approach 1:
The patent changes the parameter of transmission pulse width from the conventional minimum of 1T to a minimum of 2T, making the control signals compatible with the flex cable's minimum transmission capability while still supporting high-speed data recording operations
2Reliability
If the transmission pulse width is extended to ensure signal integrity, then the signal transmission quality is improved, but the data recording speed is reduced
Solution Approach 1:
The patent segments the control signal transmission by introducing intermediate states and breaking down the power level transitions into multiple steps, allowing the use of longer pulse widths (minimum 2T) without compromising the overall data recording speed
3Productivity
If conventional 1T transmission pulses are used, then the data recording speed is maintained, but the write quality is degraded due to inaccurate control of laser pulses
Solution Approach 1:
The patent applies beforehand cushioning by designing control signals with minimum 2T pulse widths that provide a margin of safety against signal degradation, ensuring that even with flex cable limitations, the laser pulse control remains accurate and write quality is maintained
Data Source
AI summary
A controller of an optical storage apparatus for generating a plurality of control signals is provided. The controller includes a code generator implemented for determining a plurality of control codes according to an input data associated with data recording, and generating the control signals to deliver the control codes. Each of the control codes represents one power level. Besides, regarding each of the control signals, a minimum transmission pulse length thereof corresponds to more than one power symbol period.