Signal Processor Frame End Detection Noise Masking
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Solution Overview
Problem
In FlexRay protocol-based communication systems, noise contamination can lead to incorrect detection of the end of a dynamic frame, causing simultaneous transmission of frames and resulting in frame errors and disrupted communication until the next communication cycle, which affects the reliability and efficiency of data transmission.
Innovation Solution
A signal processor with a period detection section and pattern detection section that masks consecutive 'H' levels to prevent premature recognition of frame completion, ensuring that communication actions for the next frame are halted until the current frame's period ends, thereby preventing simultaneous frame transmissions and ensuring correct timing for subsequent frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise contamination is present in the communication channel, then false detection of frame end may occur, but communication reliability deteriorates due to simultaneous frame transmissions
Solution Approach 1:
The system performs preliminary actions by detecting the presence of a frame before attempting to detect its end. A frame detection unit identifies whether a frame is currently being transmitted, and this information is used to suppress false frame end detections during the frame transmission period, thereby preventing simultaneous frame transmissions caused by noise contamination
Solution Approach 2:
A frame detection unit acts as an intermediary between the noise-prone communication channel and the frame end detection unit. This intermediary detects whether a frame is present and provides this information to suppress false detections, thereby mediating the conflict between maintaining detection sensitivity and preventing false positives due to noise
2Reliability
If the system suppresses frame end detection during active communication periods, then simultaneous transmissions are prevented, but detection response time increases
Solution Approach 1:
The suppression control is dynamically adjusted based on real-time frame detection status. The system suppresses frame end detection only during periods when a frame is detected to be present, and allows normal detection when no frame is present. This dynamic approach maintains communication reliability during active transmissions while minimizing detection delays during idle periods
Data Source
AI summary
A signal processor includes a period detection section which detects that a period is currently used for communication of a frame; a pattern detection section which detects, from the received signal, a first signal pattern by which the end of communication of the frame is recognized; and an output processing section which outputs the received signal to a controller, configured to instruct, upon detection of the first signal pattern in the period being currently used for communication of a frame, the controller to halt startup of communication action of the next frame, until the period being currently used for communication of a frame comes to the end, to thereby reduce an event such that frames are transmitted from a plurality of communication devices simultaneously, and to thereby allow the communication action for the next frame to proceed correctly.