Optical Disc Access Device Dual Address Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical disc devices face challenges in achieving high-speed and stable reproduction access due to limitations in address information detection speed, stability of address information in mixed recorded and unrecorded areas, and vulnerability to external disturbances like scratches or fingerprints.
Innovation Solution
The device employs a dual-address system, using both pre-formed shape-based address information and recorded address information, with a control section that switches between detection methods based on which address information is detected first to optimize access and recovery from disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If address information is detected using conventional single-method detection, then the detection process is simple, but the access speed is slow and stability is poor in mixed recorded and unrecorded areas
Solution Approach 1:
The patent divides the address detection function into two separate detection sections: one for detecting address information from pre-formed shapes (ADIP) and another for detecting address information from recorded data (AUN). Each detection section operates independently and processes different types of address information, allowing the system to select the faster detection method based on the detection result, thereby improving access speed without requiring a completely complex unified detection system.
Solution Approach 2:
The control section is designed to universally handle both detection methods and make decisions based on which address information is detected first. The system can adaptively switch between ADIP-based detection and AUN-based detection, making the detection system multi-functional and capable of operating effectively in both recorded and unrecorded areas, thus improving overall system versatility and access performance.
2Speed
If only pre-formed shape-based address information is used, then the address information is stable, but the detection speed is slow
Solution Approach 1:
The patent pre-forms address information in two different formats: ADIP (address in pregroove) during the disc manufacturing process, and AUN (address unit number) during the data recording process. By having both address information types prepared in advance in different locations and formats, the system can quickly detect the available address information without requiring real-time generation or conversion, thereby improving detection speed while maintaining reliability through redundant address information.
3Reliability
If address information detection relies on a single method, then the system is simple to operate, but it is vulnerable to external disturbances like scratches or fingerprints
Solution Approach 1:
The patent applies different detection methods to different local areas of the recording medium. ADIP address information is embedded in the pregroove structure and is suitable for detection in unrecorded or lightly recorded areas, while AUN address information is recorded with user data and is suitable for detected in fully recorded areas. The control section selects the appropriate detection method based on the local condition, improving detection stability in mixed recorded and unrecorded areas without requiring a uniformly complex detection system.
Solution Approach 2:
The system prepares multiple address information detection paths in advance (ADIP detection and AUN detection) to cushion against potential failures or disturbances. If one detection method fails due to external disturbances like scratches or fingerprints, the control section can switch to the other detection method, providing redundancy and improving overall detection reliability without requiring complex error correction mechanisms during operation.
4Reliability
If the system uses both address information types with switching control, then access speed and stability are improved, but the control complexity increases
Solution Approach 1:
The control section automatically determines which address information (ADIP or AUN) is detected first and autonomously selects the appropriate detection result for access control without requiring manual intervention. The system self-manages the switching between detection methods based on the detection timing, making the complex control operation transparent to the user and maintaining ease of operation while improving access stability through intelligent automated control.
Data Source
AI summary
An information reproduction device according to the present invention is a device for accessing a recording medium having first address information and second address information recorded thereon. The first address information is represented by a shape formed on the recording medium in advance; and the second address information is recorded on the recording medium together with data. The information reproduction device includes a head section for accessing the recording medium to generate a reproduction signal; a first detection section for detecting the first address information from the reproduction signal; a second detection section for detecting the second address information from the reproduction signal; and a control section for, based on a detection result of either the first detection section or the second detection section which detected the address information first, controlling an access after the detection to the recording medium.