Set Top Box Power Detection via Sequential Signal Analysis
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Solution Overview
Problem
Existing methods for testing set top boxes (STBs) are inadequate in detecting failure modes, particularly in determining if an STB has power on, as they do not effectively utilize a sequential detection approach for various video signals and AC power outlet signals.
Innovation Solution
A method and system that sequentially checks for composite video, RF video, component video Y, and AC power outlet signals to determine if an STB has power on, using dedicated detection circuits for each signal type, allowing for flexible testing of multiple or single STB units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple video signal types and AC power outlet signals are sequentially detected to determine STB power status, then the reliability of power detection is improved, but the device complexity increases due to multiple dedicated detection circuits
Solution Approach 1:
The detection system is divided into separate dedicated detection circuits for each signal type (composite video, RF video, component video Y, and AC power outlet). Each circuit independently monitors its specific signal type, allowing the system to comprehensively determine STB power status through multiple independent detection channels, thereby improving reliability while maintaining modular complexity
Solution Approach 2:
The detection system is designed to handle multiple types of signals (video and power) through a unified sequential detection framework. The same microprocessor unit coordinates all detection circuits and processes results from different signal types, creating a multi-functional detection system that improves reliability without proportionally increasing overall system complexity
2Measurement precision
If a sequential detection approach is used for multiple signal types, then the measurement precision of power status determination is improved, but the loss of time increases due to multiple detection steps
Solution Approach 1:
The detection system performs preliminary checks of multiple signal types simultaneously or in a predetermined sequence, allowing the microprocessor to quickly eliminate impossible power states early in the detection process. This preliminary action approach enables precise power status determination while minimizing total detection time by not waiting for all signals to be fully evaluated
Solution Approach 2:
The detection system implements periodic monitoring of all signal types at scheduled intervals rather than continuous monitoring. This periodic action allows the system to maintain high measurement precision by regularly updating power status determination while significantly reducing the time burden compared to continuous detection of all signal types
Data Source
AI summary
A method of power signal detection of set top boxes under test is disclosed. According to certain embodiments, detection of a failure mode of a set top box (STB) under test is based on video signal detection where the video signal is associated with multiple video output types and AC power outlet signal detection.