Packet Data Transmission Device Noise Resilience
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Solution Overview
Problem
Current data transmission standards for industrial digital cameras face challenges in long-distance transmission and noise resistance, particularly in environments with high noise levels, where standards like USB3.0 and CameraLink have short transmission distances, and GigE Vision and CoaXPress lack real-time data retransmission mechanisms, making them unsuitable for machine vision applications requiring real-time data integrity.
Innovation Solution
A packet data transmission method that intermittently transmits duplicate packet data with controlled idle time and noise duration, ensuring that the packet data is not affected by low-frequency noise, allowing for reliable transmission over thin cables in noisy environments, and incorporating redundant encoding and Forward Error Correction to handle high-frequency noise without retransmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If USB3.0 standard is used for data transmission, then data transmission speed is high (5Gbps), but data transmission distance is short (5m or less)
Solution Approach 1:
The patent applies periodic action by transmitting the same packet data multiple times at different time intervals. The transmission is performed periodically with controlled idle time between transmissions, allowing the signal to be received correctly during noise-free periods while maintaining high data transmission speed.
2Length of stationary object
If GigE Vision standard is used for long distance transmission (100m or more), then data transmission distance is extended, but noise resistance deteriorates due to vulnerability to electric noise
Solution Approach 1:
The patent applies preliminary action by transmitting duplicate packet data in advance before the actual data transmission is needed. By having redundant copies ready and selecting the correct one based on reception quality, the system proactively handles potential noise corruption without requiring retransmission, thus maintaining both long distance capability and noise resistance.
3Length of stationary object
If CoaXPress standard is used with thin cable (3CFB) for long distance transmission, then data transmission distance is extended (100m or more), but noise resistance deteriorates and cannot endure ±2kV burst noise
Solution Approach 1:
The patent applies beforehand cushioning by transmitting the same packet data multiple times in advance. When burst noise corrupts a transmission, the receiver has already received and stored multiple clean copies during noise-free periods, providing a buffer against the harmful noise effects without requiring retransmission or thicker cables.
4Reliability
If data retransmission mechanism is implemented to handle noise corruption, then noise resistance is improved, but real-time property deteriorates due to retransmission delay
Solution Approach 1:
The patent eliminates retransmission delay by performing preliminary transmission of duplicate packet data. Instead of waiting for acknowledgment and retransmitting corrupted data, the system has already sent multiple copies in advance, allowing the receiver to immediately select a clean copy without any time loss.
5Reliability
If thick cable (7CFB) is used to endure ±2kV burst noise, then noise resistance is improved, but device complexity and installation difficulty increase due to expensive cable and working efforts for laying
Solution Approach 1:
The patent changes the transmission parameter from using thicker cable physical protection to using temporal redundancy (multiple transmissions at different times). By transmitting data multiple times with controlled idle time, the system achieves noise resistance equivalent to thick cable protection but using standard thin cables, thus reducing device complexity and installation difficulty.
Data Source
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Figure 3(a)~3(b)
AI summary
[Problem] To prevent either of two packet data having the same content from being affected by noise [Solution] A packet data transmission device (not shown) transmits first packet data 1A, ... and second packet data 1B, ... having the same content intermittently with an idle time I therebetween. When the length of the first and second packet data 1A, ..., 1B, ... is denoted by LP, the length of the idle time I is denoted by LI, the duration of low-frequency noise N is denoted by LN, the time with no low-frequency noise from the occurrence of one low-frequency noise N to the occurrence of the next low-frequency noise N is denoted by LC, the following expressions (1), (2) are satisfied. Consequently, either the first packet data or the second packet data is transmitted to a receiver without being affected by noise. LI>LN 2×LP+LI<LC