Modulation System Abnormality Detection via Periodic Extinguishing
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Solution Overview
Problem
Existing visible light communication systems struggle to detect abnormalities in modulators, particularly when multiple light sources are synchronized, as the technique disclosed in PTL 1 cannot easily identify issues with individual modulators.
Innovation Solution
A system comprising a first modulator that generates a control signal to modulate an input signal for a first light source and a second modulator that acquires and modulates the input signal for a second light source, using extinguishing and light information signals to visually indicate abnormalities, allowing users to easily identify reversely connected states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light sources are synchronized for efficient communication, then communication efficiency is improved, but abnormality detection becomes difficult
Solution Approach 1:
The patent applies periodic action by introducing a specific extinguishing period during which the light source is intentionally turned off. This periodic interruption allows visual confirmation that the light source responds to control signals, enabling abnormality detection while maintaining synchronized communication operation during the remaining time periods.
Solution Approach 2:
The patent implements feedback by creating a visual confirmation mechanism where the extinguishing of the light source during the extinguishing period provides immediate observable feedback. This feedback loop allows users to verify that the modulator and light source are functioning correctly and responding to control signals, thus detecting abnormalities in the communication system.
2Duration of action of stationary object
If light sources remain continuously on for communication, then communication continuity is improved, but abnormality detection is hindered
Solution Approach 1:
The patent resolves this contradiction by implementing periodic action through the extinguishing period. The light source operates continuously except for these periodic interruptions, maintaining overall communication continuity while enabling abnormality detection during the scheduled extinguishing intervals. This approach ensures that the system remains operational while providing opportunities for visual verification.
3Difficulty of detecting and measuring
If extinguishing period is long enough for visual recognition, then abnormality detection is improved, but communication time is reduced
Solution Approach 1:
The patent applies partial action by implementing a brief extinguishing period that is just sufficient for visual recognition of abnormality. Rather than extending the extinguishing period to maximize detection capability, the patent uses the minimum necessary duration to achieve the detection goal, thereby minimizing communication time loss while still enabling effective abnormality detection.
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
Enables easy detection of abnormalities in the system, ensuring correct operation and preventing hazardous conditions by visually distinguishing correctly connected and reversely connected modulators through luminance variations.
Implementation Method 1
a first modulator that generates a control signal and modulates an input signal in accordance with the generated control signal, to control luminance of a first light source that emits light according to the modulated input signal
Data Source
AI summary
A system with which any abnormality can easily be found is provided. A system includes: a first modulator that generates a control signal and modulates an input signal in accordance with the generated control signal, to control luminance of a first light source that emits light according to the modulated input signal, the first modulator outputting the control signal; and a second modulator that acquires a control signal output from the first modulator and modulates an input signal in accordance with the control signal, to control luminance of a second light source that emits light according to the modulated input signal. The first modulator generates, as an extinguishing signal, the control signal for extinguishing the first light source by an extinguishing period. After a lapse of the extinguishing period, the first modulator generates, as a light ID signal, the control signal for transmitting a visible light signal by luminance variations of the first light source.