Video Signal Input Path Abnormality Detection Circuit
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Solution Overview
Problem
Conventional abnormality detecting apparatuses for video signal input paths cannot locate the cause of abnormalities, despite being able to diagnose disconnection or short-circuit issues.
Innovation Solution
An abnormality detecting apparatus with a synchronous detecting circuit and path state judging means that determines the state of the input path based on direct current signal levels and synchronous signal detection, distinguishing between normal, open, power connected, and ground connected states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional abnormality detecting apparatus uses threshold comparison of parallel signals to diagnose disconnection or short-circuit, then abnormality detection capability is achieved, but the ability to locate the specific cause of abnormality is lost
Solution Approach 1:
The patent segments the abnormality detection process into three distinct detection dimensions: DC signal level detection (for power/ground connection status), synchronous signal detection (for signal integrity), and threshold comparison (for abnormality confirmation). Each segment provides specific information about different aspects of the input path state, enabling both abnormality detection and cause localization simultaneously.
Solution Approach 2:
The patent adds new detection dimensions beyond simple threshold comparison. By introducing DC signal level measurement (detecting voltage levels relative to power/ground thresholds) and synchronous signal detection (detecting signal timing and integrity), the system transforms a one-dimensional threshold check into a multi-dimensional diagnostic approach that preserves cause localization information.
2Measurement precision
If the system determines input path state based on multiple parameters (DC signal levels and synchronous signal detection), then cause localization precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the abnormality detecting apparatus multi-functional by integrating three detection capabilities into a single system: DC voltage level detection, synchronous signal detection, and threshold-based abnormality detection. This universal approach allows the same device to perform both abnormality detection and cause localization without requiring separate diagnostic equipment, thereby managing complexity while improving precision.
Solution Approach 2:
The patent merges multiple detection functions into a unified diagnostic system. The DC signal level detection, synchronous signal detection, and threshold comparison operations are combined in a single apparatus that processes multiple parameters simultaneously to determine input path state, reducing the need for separate diagnostic devices and managing overall system complexity.
Data Source
AI summary
An abnormality detecting apparatus comprises a synchronous detecting circuit for detecting a synchronous signal from a video signal outputted from a camera unit, and an abnormality detecting circuit for judging whether or not a first direct current signal level obtained from an input path of said video signal is greater than a predetermined first threshold value, whether or not a second direct current signal level obtained from said input path of said video signal is smaller than a predetermined second threshold value, and whether or not said synchronous signal is detected by said synchronous detecting circuit, and determining that said input path of said video signal is in one of a normal state, an open state, a power connected state, and a ground connected state based on the result of the judgments.