DVD Type Determination via Wobble Signal Frequency Analysis
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Solution Overview
Problem
Conventional methods for determining the type of digital versatile discs (DVD-ROM, DVD-, and DVD+) often result in false determinations due to the degradation of position data on burned discs, leading to incompatibility with different disc players.
Innovation Solution
A method and apparatus that determine the type of a digital versatile disc by analyzing the frequency of the wobble signal, using a frequency dividing factor to calculate the frequency of the wobble signal and setting a unit time based on the disc's spinning speed, allowing for accurate classification without relying on position data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If position data from pre-groove wobble signals is used to determine disc type, then the method is compatible with DVD- and DVD+ specifications, but false determination occurs due to position data degradation on burned discs
Solution Approach 1:
The patent changes the parameter used for disc type determination from position data to wobble signal frequency. By measuring the frequency of the wobble signal (which has distinct frequency ranges for DVD-ROM, DVD-, and DVD+), the system achieves reliable identification without being affected by position data degradation on burned discs.
2Measurement precision
If position data decoding is used to identify disc type, then the method can distinguish between DVD formats, but the determination becomes inaccurate when position data quality degrades
Solution Approach 1:
The patent introduces wobble signal frequency as an intermediary parameter that indirectly indicates disc type. Instead of directly analyzing position data (which degrades on burned discs), the system measures the frequency of the wobble signal, which remains stable and provides reliable disc type identification through its distinct frequency characteristics for different DVD formats.
3Ease of manufacture
If conventional position data methods are used, then disc type can be determined following standard specifications, but incompatibility arises with different disc players due to false determination
Solution Approach 1:
The patent implements a universal disc type determination method based on wobble signal frequency that works across all DVD player types. By using frequency measurement instead of position data decoding, the system achieves broad compatibility with different disc players while maintaining ease of implementation, as the frequency characteristics are inherent to each disc format specification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of determining disc types by avoiding false determinations and incompatibility issues, ensuring correct identification of DVD-ROM, DVD-, and DVD+ discs based on distinct frequency ranges.
Implementation Method 1
Photo diodes of the pick-up head 101 are arranged as shown in FIG. 1. These areas A, B, C and D sense signals with different intensities.
Data Source
AI summary
A method and an apparatus for determining types of digital versatile discs (DVDs) are provided. The method includes setting related parameters, acquiring a wobble signal from a DVD, setting a frequency dividing factor, and dividing the frequency of the wobble signal by the frequency dividing factor. Then, the time required for the digital versatile disc to spin one round, which is driven by a spindle motor of a disc player, is set as a unit time to calculate the frequency of the frequency-divided wobble signal. Finally, the type of the digital versatile disc is determined according to the frequency of the wobble signal.