Dynamic Write Pulse Control for Optical Media Compatibility
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Solution Overview
Problem
Existing optical disc recording apparatuses are incompatible with newly developed high-speed media or media using new formats, as they are fixed with specific writing strategies that do not support varying recording characteristics across different types of optical recording media.
Innovation Solution
A recording apparatus that generates write pulse control signals suitable for various optical recording media by using a pattern detector, memory for storing timing parameters, and a write pulse generator, which adjusts pulse parameters based on the type of media, allowing for flexible writing strategies across different media types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed hardware writing strategy modules are used, then the apparatus can support writing strategies set upon manufacture, but it becomes incompatible with newly developed high-speed media or media using new formats
Solution Approach 1:
The patent transforms the fixed hardware writing strategy module into a dynamic system by replacing it with a processor that executes software-based writing strategies. The processor can dynamically select and adjust writing parameters (such as laser power, pulse width, and modulation depth) based on the detected media type, enabling the apparatus to adapt to both existing and newly developed optical recording media formats.
Solution Approach 2:
The invention implements parameter changes by storing multiple writing strategy parameter sets in memory, each optimized for different media types. The processor fetches appropriate parameters (e.g., EFM modulation depth, laser diode drive current, write pulse characteristics) based on media identification, allowing the system to adjust its writing characteristics to match the specific requirements of each media format.
2Stability of the object's composition
If writing strategies are fixed in hardware, then the apparatus has stable performance for existing media, but it cannot accommodate media requiring new writing strategies
Solution Approach 1:
The patent achieves universality by designing a processor-based control system that can execute multiple writing strategies through software. Instead of having separate hardware circuits for each media type, the universal processor can load and execute different writing strategy programs, making the apparatus capable of handling various optical media formats (CD-R, CD-RW, DVD-R, DVD+R, HD-DVD, BD) with a single unified control architecture.
Solution Approach 2:
The invention uses copying by storing digital representations of writing strategy parameters in memory. Rather than having physical hardware configurations for each media type, the system copies the appropriate parameter sets from memory to the processor when a specific media type is detected, allowing rapid switching between different writing strategies without physical reconfiguration.
Data Source
AI summary
A recording apparatus for generating write pulse control signals suitable for various optical recording media includes a pattern detector receiving a non return to zero inverted (NRZI) signal and distinguishing between information about a mark and information about a space, a memory storing timing parameters for a start pulse, a middle pulse, an ending pulse, and a cooling pulse of the write pulses corresponding to each of the various recording media using an activation table or in an index remapping method, a parameter fetcher fetching suitable timing parameters from the memory in response to a result of the distinguishing by the pattern detector, and a write pulse generator generating the write pulses based on the timing parameters received from the parameter fetcher and information stored in a register.