Visible Light Communication Reproduction Device Correcting Spectral Reflectivity
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Solution Overview
Problem
Existing visible light communication systems face challenges in accurately reproducing information from light due to the interference caused by the spectral reflectivity of objects, leading to unsatisfactory information retrieval.
Innovation Solution
A reproduction device that corrects color-difference signals in the received light using a linear combination of color-difference signals of known amplitudes, employing an interference matrix to account for the spectral reflectivity of objects, allowing for accurate information retrieval from light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If information is superimposed on light for visible light communication, then communication capability is enabled, but spectral reflectivity of objects causes interference and degrades information reproduction accuracy
Solution Approach 1:
The patent converts the harmful spectral reflectivity interference into a beneficial factor by using the reflected light itself as the detection signal. The light receiving unit captures light that has reflected off objects, and the processor extracts modulation information from these reflected signals, transforming what was previously a source of interference into the primary detection mechanism for visible light communication
Solution Approach 2:
The patent introduces an intermediary processing stage between light transmission and information extraction. The processor acts as an intermediary that separates the modulation information from the spectral reflectivity effects by generating color-difference signals and applying correction based on known amplitude relationships, thereby isolating the communication signal from the interfering reflectivity characteristics
2Measurement precision
If color-difference signals are generated from received light, then information extraction is enabled, but spectral reflectivity causes signal distortion and reduces measurement precision
Solution Approach 1:
The patent changes the parameter space by transforming RGB light intensity values into color-difference signals (such as UV or YCbCr components). This parameter transformation allows the system to operate in a color space where the modulation information is more distinguishable from spectral reflectivity effects, improving measurement precision by operating in a more favorable parameter domain
Solution Approach 2:
The patent implements a feedback mechanism where the processor uses known amplitude relationships of color-difference signals to correct measured values. By comparing actual measurements against expected amplitude ratios and applying corrections, the system continuously refines its information extraction accuracy, compensating for distortions introduced by spectral reflectivity
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
The solution enables satisfactory reproduction of information superimposed on light despite the interference from spectral reflectivity, improving the reliability and accuracy of visible light communication systems.
Implementation Method 1
receive light emitted based on a plurality of signals having a specific amplitude in a specific color space on which information is superimposed
Data Source
AI summary
A reproduction device is configured to receive light emitted based on a plurality of signals having a specific amplitude in a specific color space on which information is superimposed, and to reproduce the information based on the received light. The reproduction device includes: a memory; and a processor coupled to the memory and configured to: generate a plurality of signals in the specific color space from the received light, correct the generated plurality of signals based on the specific amplitude, and acquire the information based on the corrected plurality of signals.