Recording Clock Circuit Sharing for Dual DVD Format Wobble Signals
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Solution Overview
Problem
Conventional DVD-R/RW and DVD+RW/+R recorders require separate PLL circuits for different standards, leading to increased circuit scale and complexity, particularly in converting binarized wobble signals between DVD+RW/+R and DVD-R/RW formats for sync protection.
Innovation Solution
A recording clock generation apparatus that includes a frequency conversion circuit to convert 32T-cycle binarized wobble signals to 186T-cycle signals and vice versa, along with a physical address data decoder to convert ADIP to land pre-pit signals and vice versa, allowing sharing of circuits and reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PLL circuits are provided for DVD-R/RW and DVD+RW/+R standards, then sync protection and data integrity are maintained, but circuit scale and complexity increase
Solution Approach 1:
The patent implements a universal PLL circuit that can process both 186T-cycle wobble signals (DVD-R/RW) and 32T-cycle wobble signals (DVD+RW/+R) by incorporating a frequency conversion circuit. This multi-functional approach allows a single PLL circuit to serve both standards, reducing circuit scale while maintaining sync protection through unified phase-locked operation.
Solution Approach 2:
The patent introduces a frequency conversion circuit as an intermediary component that transforms 32T-cycle wobble signals into 186T-cycle wobble signals. This mediator enables the main PLL circuit to process both signal types uniformly, simplifying the overall circuit architecture while preserving the reliability benefits of standard-specific signal processing.
2Manufacturing precision
If separate PLL circuits are provided for different standards, then format-specific recording is accurate, but production cost increases
Solution Approach 1:
The patent merges the functionality of separate PLL circuits into a single unified circuit by combining the frequency conversion circuit with the main PLL circuit. This consolidation reduces the number of components required, lowering production costs while maintaining format-specific recording accuracy through intelligent signal routing and conversion.
Solution Approach 2:
The unified PLL circuit is designed to handle both DVD-R/RW and DVD+RW/+R standards through its multi-functional capability, allowing manufacturers to produce cost-effective recorders that support multiple formats without sacrificing recording precision for either standard.
3Adaptability or versatility
If ADIP to LPP conversion is implemented, then multi-optical-disc compatibility is achieved, but conversion circuit complexity increases
Solution Approach 1:
The frequency conversion circuit acts as an intermediary that mediates between the ADIP signal format (32T-cycle) and the LPP signal format (186T-cycle). By converting the fundamental frequency characteristics, it enables seamless interoperability between different optical disc standards without requiring complex format-specific processing circuits.
Solution Approach 2:
The conversion process fundamentally changes the temporal parameter of the wobble signal from a 32T-cycle period to an 186T-cycle period. This parameter transformation simplifies the conversion circuit architecture by focusing on a single critical change rather than requiring complex multi-parameter adjustments, thereby achieving multi-format compatibility with reduced complexity.
Data Source
AI summary
There is provided an optical disc recording apparatus containing a small-area circuit that is adaptable to both of the formats of DVD-R/RW and +RW/+R standards.The apparatus is provided with a circuit (106) for converting a 32T-cycle binarized wobble signal based on the +RW/+R standard into a 186T-cycle binarized wobble signal based on the DVD-R/RW standard, and the converted 186T-cycle binarized wobble signal is selected with a selector (108) during +RW/+R recording while the 186T-cycle binarized wobble signal is selected during DVD-R/RW recording, whereby subsequent PLL circuits are shared to reduce the circuit scale.