Network Interface Card for Public Announcement Processing
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Solution Overview
Problem
Transportation vehicles face challenges in processing public announcements that require software design assurance level D, while other applications are executed at a lesser level, such as Level E, leading to cumbersome upgrades and redesigns to meet higher assurance levels.
Innovation Solution
A network interface card (NIC) is used to identify and process public announcement packets, bypassing the seat device processor, and transferring them directly to an audio system, allowing for separate handling of public and non-public announcement audio to meet Level D requirements without upgrading existing Level E software.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If public announcement processing is integrated into the main seat device processor running Level E software, then system complexity is reduced, but software design assurance level cannot meet Level D requirements
Solution Approach 1:
The system is segmented into two independent processing paths: a Level E software path for general entertainment functions and a separate Level D certified path for public announcement processing. This segmentation allows each path to operate at its appropriate assurance level without requiring the entire system to be upgraded to Level D, thus resolving the contradiction between system complexity and software design assurance level.
2Reliability
If the system is upgraded to meet Level D assurance requirements, then public announcement processing reliability is improved, but existing Level E software applications become burdensome to redesign
Solution Approach 1:
The Level D certified public announcement processing functionality is extracted as a separate, independent module from the Level E entertainment software. This extraction allows the Level D module to be implemented and certified independently, meeting reliability requirements for public announcements without forcing a system-wide upgrade that would burden existing Level E software applications.
3Device complexity
If public announcement packets are processed through the main processor, then packet handling is simplified, but processing speed and real-time performance deteriorate
Solution Approach 1:
A dedicated Level D certified processing module acts as an intermediary for public announcement packets. This intermediary module receives packets directly from the network interface, processes them independently without burdening the main Level E processor, and outputs to the audio system. This approach maintains simplified packet handling while achieving fast real-time processing performance.
Data Source
AI summary
Methods and systems for a transportation vehicle are provided. One method includes receiving a network packet at a network interface device of an information system of a transportation vehicle; identifying public announcement audio in a payload of the network packet by the network interface device; extracting the public announcement audio from the payload of the network packet by the network interface device; transferring the public announcement audio to an audio system by the network interface device; and playing the public announcement audio by the audio system.