Feed-Forward Correction Module for Optical Storage Signal Profiles
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Solution Overview
Problem
Signal processing circuits in optical storage devices face challenges in responding quickly to sudden profile changes, such as those induced by fingerprint stains, due to the limitations of traditional feedback control loops which result in slow response times and increased noise.
Innovation Solution
The implementation of a feed-forward correction module that detects profile variations within a time window and applies immediate corrections to the electrical signal, using offset and gain correction mechanisms to quickly adapt to changes, thereby reducing noise and enhancing response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional feedback control loops are used for offset and gain control, then the circuit maintains stable signal levels, but the response time to sudden profile changes is slow
Solution Approach 1:
The patent implements a feed-forward correction module that proactively detects profile variations in the electrical signal and applies corrections before the feedback control loop can respond. This preliminary action enables fast response to sudden changes (such as fingerprint stains) without waiting for the slower feedback mechanism to detect and correct the deviation, thus resolving the speed-stability contradiction
2Object-generated harmful factors
If traditional feedback control loops are used for offset and gain control, then the circuit maintains stable signal levels, but noise increases due to slow response
Solution Approach 1:
By detecting profile variations proactively and applying corrections through the feed-forward module before they propagate through the system, the patent prevents noise generation that would otherwise occur due to the delayed response of traditional feedback loops. This maintains signal stability while minimizing noise
3Speed
If feed-forward correction is applied to correct profile variations, then response speed improves, but device complexity increases
Solution Approach 1:
The patent segments the signal processing function into two distinct parts: a feed-forward correction module for fast response to profile variations, and a traditional feedback control loop for maintaining overall signal stability. This segmentation allows each module to specialize in its strength without requiring complete redesign of the entire system, thus managing complexity while achieving improved response speed
Data Source
AI summary
Aspects of the disclosure provide a signal processing circuit that has fast response time to sudden profile changes in an electrical signal. The signal processing circuit includes a processing path configured to process an electrical signal that is generated in response to reading data on a storage medium, and a feed-forward correction module. The feed-forward correction module is configured to detect a profile variation based the electrical signal in a time window, and correct the electrical signal in the time window based on the detected profile variation.