Event-Based Optical Receiver for Asynchronous Color Signal Decoding
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Solution Overview
Problem
Conventional optical communication systems struggle with inefficiencies in processing high-speed color changes and require fixed frame rates, limiting their ability to receive signals from transmitters with varying color change cycles and being prone to noise and non-target signal processing.
Innovation Solution
A receiver with a color filter and imager that detects luminance changes exceeding a threshold, outputs event signals, and a control apparatus that decodes color patterns to identify and process communication signals without fixed frame rates, allowing asynchronous reception and efficient signal identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed frame rate is used for signal reception, then the system structure is simple, but the system cannot receive signals from transmitters with varying color change cycles and is prone to noise
Solution Approach 1:
The patent implements dynamic frame rate adjustment where the receiving apparatus changes its frame rate according to the detected color change cycle of the transmitter. The controller adjusts the frame rate to match or synchronize with the transmitter's color cycling pattern, enabling effective reception of signals from transmitters with varying cycles. This dynamic adaptation resolves the contradiction by allowing the system to handle diverse transmitter protocols without requiring a completely complex fixed-structure system.
Solution Approach 2:
The patent changes the operational parameters of the receiving apparatus, specifically the frame rate, based on the detected characteristics of the incoming optical signal. By monitoring the color change cycle and adjusting the frame rate accordingly, the system adapts to different transmitter protocols. This parameter change approach enables the system to maintain simplicity while achieving versatility in receiving various signal types.
2Productivity
If conventional optical communication systems process high-speed color changes, then signal reception is possible, but processing efficiency is low and accuracy is reduced
Solution Approach 1:
The patent employs feedback mechanisms where the receiving apparatus continuously monitors the color changes of the incoming optical signal and adjusts its processing parameters accordingly. The controller receives feedback about the color change cycle and frame rate, and uses this information to optimize the signal processing in real-time. This feedback loop enables the system to maintain high processing efficiency and accuracy by adapting to the actual signal characteristics rather than using fixed processing parameters.
Solution Approach 2:
The patent utilizes periodic action by synchronizing the receiving apparatus's frame rate with the periodic color changes of the transmitter. By adjusting the frame rate to match the color change cycle, the system captures color information at optimal moments, improving both processing efficiency and detection accuracy. This periodic synchronization allows the system to handle high-speed color changes effectively without sacrificing precision.
3Reliability
If the system processes all detected color changes, then complete signal reception is achieved, but noise and non-target signals are processed reducing efficiency
Solution Approach 1:
The patent extracts and separates target signals from non-target signals by using color information as a distinguishing feature. The receiving apparatus analyzes the color changes and frame rates to identify signals that match the expected communication pattern. By extracting only the relevant signals that conform to the learned or expected color change patterns, the system filters out noise and non-target signals, thereby improving processing efficiency while maintaining reception completeness through targeted signal processing.
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 faster and more accurate communication by asynchronously receiving signals from transmitters with different cycles, reducing noise, and optimizing storage usage by retaining only desired information, thus improving efficiency and accuracy.
Implementation Method 1
an imager that has pixels arranged to correspond to the color components, detects, for each of the pixels, a luminance change as an event in response to the luminance change being equal to or more than a threshold value
Implementation Method 2
a color filter in which filter elements corresponding to color components are arranged in a predetermined color array
Data Source
AI summary
Disclosed is a control method that is performed by a processor of a receiving apparatus including a receiver including: a color filter in which filter elements corresponding to color components are arranged in a color array; and an imager that has pixels arranged to correspond to the color components, detects, for each of the pixels, a luminance change as an event in response to the change being equal to or more than a threshold value, and in response to detecting the event, outputs an event signal including a position of a pixel where the event has occurred and a polarity of the change. The control method includes: first-obtaining, based on the event signal, color information on the pixel where the change has occurred; second-obtaining, based on temporal change of the color information, a color pattern indicating time-series change of the color information; and decoding the color pattern to obtain information.