Signal Processing Circuit Anomaly Detection
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Solution Overview
Problem
In in-vehicle display systems, detecting anomalies in the image freeze detection circuit is inaccurate and requires a large circuit size, which impedes large-scale integration, and if an operation circuit malfunctions, the determination results become unusable.
Innovation Solution
A signal processing circuit with n+1 operation circuits, a signal supply unit, and an anomaly determination unit that concurrently performs anomaly detection by sequentially selecting and testing each operation circuit with test data, allowing for anomaly determination without increasing circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate host device diagnosis circuit is provided to detect anomalies in operation circuits, then anomaly detection accuracy is improved, but circuit size increases
Solution Approach 1:
The operation circuits are designed to serve dual purposes: performing their primary image processing functions and simultaneously serving as test circuits for anomaly detection. By making the operation circuits multi-functional, the patent eliminates the need for separate host device diagnosis circuits, thereby maintaining anomaly detection capability while reducing overall circuit size.
Solution Approach 2:
Each operation circuit performs self-diagnosis by testing itself using test data supplied through the signal supply unit. The operation circuits autonomously detect their own anomalies without requiring external diagnosis circuits,实现ing self-service anomaly detection that reduces circuit complexity and size.
2Reliability
If multiple operation circuits are provided for anomaly detection, then anomaly detection capability is improved, but device complexity increases
Solution Approach 1:
The anomaly detection function is segmented and distributed across multiple operation circuits, with each circuit capable of self-testing. This segmentation allows parallel anomaly detection without requiring a centralized complex diagnosis system, reducing overall device complexity while maintaining detection capability.
Solution Approach 2:
The anomaly detection function is merged with the operational function of the existing circuits. By combining these functions in the same hardware resources, the patent avoids adding separate diagnosis circuits, thereby reducing device complexity while maintaining anomaly detection capability.
3Productivity
If operation circuits are used for both processing and anomaly detection, then productivity is improved, but reliability deteriorates when anomaly occurs
Solution Approach 1:
The system implements feedback through the anomaly determination unit that continuously monitors test results from operation circuits. When an anomaly is detected, the feedback mechanism allows the system to identify and exclude affected circuits from determination processes, maintaining reliability by ensuring only healthy circuit results are used.
Solution Approach 2:
The system performs preliminary anomaly detection using test data before processing actual image data. By conducting preliminary tests, the system can identify and isolate faulty circuits in advance, preventing compromised determination results from affecting overall system reliability while maintaining continuous operational productivity.
Data Source
AI summary
A signal processing circuit has: n+1 (n being an integer of 2 or greater) operation circuits, each of which is configured to execute a prescribed operation process on inputted data; a signal supply unit that is configured to receive n pieces of input data extracted from one input signal and receive test data inputted separately from the n pieces of input data, sequentially select one operation circuit among the n+1 operation circuits and supply the test data to the one selected operation circuit, and supply the n pieces of input data to n operation circuits other than the one operation circuit among the n+1 operation circuits; and an anomaly determination unit that is configured to determine whether an anomaly has occurred in the one operation circuit on the basis of an operation result of an operation on the test data by the one operation circuit.