Universal Maximum Likelihood Signal Detection for Optical Discs
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Solution Overview
Problem
Conventional maximum likelihood signal detection apparatuses require multiple devices to handle signals with different channel responses, coding constraints, and channel memory lengths, leading to resource wastage and increased manufacturing costs in optical disc data reading.
Innovation Solution
An apparatus that uses a trellis diagram with adjustable control signals to generate branch metrics and path metrics, allowing for detection of signals with varying channel responses, coding constraints, and channel memory lengths, thereby reducing hardware complexity and enhancing data reading efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate maximum likelihood signal detection apparatuses are used to handle signals with different channel responses, coding constraints, and channel memory lengths, then each signal type can be processed with optimized performance, but hardware resources are wasted and manufacturing costs increase
Solution Approach 1:
The patent implements a universal maximum likelihood signal detection apparatus that can process multiple signal types with different channel responses, coding constraints, and channel memory lengths through a single unified device. The apparatus uses configurable parameters and adjustable trellis diagrams to adapt to various optical disc specifications (VCD, DVD, HDDVD, Blue-ray disc), eliminating the need for multiple separate dedicated devices while maintaining optimized detection performance for each signal type
Solution Approach 2:
The patent employs dynamic and configurable components within the signal detection apparatus, including adjustable trellis diagrams that can be reconfigured based on the specific signal characteristics being processed. The system can dynamically adapt its detection parameters, constraint lengths, and channel response models to match the requirements of different optical disc formats, providing flexible multi-functionality without requiring separate hardware for each application
2Reliability
If multiple separate maximum likelihood signal detection apparatuses are used for different optical disc specifications, then each device can be optimized for its specific purpose, but manufacturing costs increase
Solution Approach 1:
The patent creates a single manufacturable apparatus design that serves multiple optical disc specifications (VCD, DVD, HDDVD, Blue-ray disc) through configurable parameters and adjustable detection algorithms. This universal design reduces manufacturing costs by eliminating the need to produce multiple separate device types, while maintaining detection accuracy optimized for each specific disc format through software or parameter-based configuration
3Productivity
If conventional Viterbit decoders are used for data detection in optical discs, then data reading capability is achieved, but resource waste occurs when handling diverse optical disc specifications
Solution Approach 1:
The patent implements a universal maximum likelihood signal detection apparatus that can process multiple signal types with different channel responses, coding constraints, and channel memory lengths through a single unified device. The apparatus uses configurable parameters and adjustable trellis diagrams to adapt to various optical disc specifications (VCD, DVD, HDDVD, Blue-ray disc), eliminating the need for multiple separate dedicated devices while maintaining optimized detection performance for each signal type
Data Source
AI summary
An apparatus for maximum likelihood signal detection comprises a reference data unit, a branch metric unit, an add-compare-select unit, a path metric unit and a path memory, and is used for detecting maximum likelihood signal. The reference information unit, the branch metric unit, the add-compare-select unit or the path metric unit can further comprise a multiplexer to removing unnecessary paths according to a control signal. The control signal is adjusted according to channel response, coding constraint or channel memory length.