Airplane Audio Line Switching Between Digital and Analog Modes
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Solution Overview
Problem
In airplanes, there is a need for a simple, secure, and energy-saving method to transmit analog audio signals from a signal source to a signal sink, particularly for emergency announcements, where existing systems require additional cabling and consume excessive power.
Innovation Solution
A dual-function assembly that uses a single line as both a digital data bus and an analog signal line, switching between modes to transmit audio signals in CD quality digitally and as an analog backup in emergencies, eliminating the need for additional cabling and reducing power consumption by switching off unnecessary components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate analog cabling system is installed for emergency announcements, then reliability is improved, but device complexity and weight increase
Solution Approach 1:
The digital data bus is designed to serve dual purposes: normal digital data transmission during regular operations and analog audio signal transmission during emergencies. The switching elements enable the same physical line to be reconfigured between digital and analog modes, eliminating the need for separate dedicated analog cabling while maintaining emergency announcement capability
Solution Approach 2:
The patent combines the digital data bus and analog audio signal transmission paths into a single shared infrastructure. By merging these previously separate functions into one unified system with reconfigurable switching elements, the patent reduces overall system complexity and weight while preserving reliability through mode-switching capability
2Measurement precision
If digital transceivers and processing units remain active during emergencies, then signal quality is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts its operational mode based on emergency conditions. During emergencies, the switching elements reconfigure the system to use only essential analog audio transmission components, dynamically deactivating non-essential digital processing units and transceivers to minimize energy consumption while maintaining adequate audio signal quality for safety announcements
Solution Approach 2:
During emergency operations, the patent applies partial action by activating only the minimum necessary components for audio transmission. Instead of keeping all digital processing units and transceivers active, the system selectively activates only the essential analog path and switching elements required for emergency announcements, reducing overall energy consumption while maintaining sufficient audio quality
3Reliability
If additional analog cabling is installed for audio transmission, then transmission reliability is improved, but weight and cost increase
Solution Approach 1:
The existing digital data bus infrastructure is made universal by enabling it to perform both digital data transmission and analog audio signal transmission. This multi-functionality eliminates the need for separate dedicated analog audio cabling, thereby reducing airplane weight while maintaining transmission reliability through the reconfigurable switching system
Solution Approach 2:
The patent merges the digital data bus and analog audio transmission functions into a single shared physical infrastructure. By combining these functions and using the same cable harness for both purposes with appropriate switching elements, the patent eliminates redundant cabling and reduces overall system weight while preserving audio transmission reliability
Data Source
AI summary
In an assembly (2) for an airplane (4) with a line (12) and switching elements (14a,b) to connect the line (12) in a first operating mode (B1) to digital transceivers (16a,b) and in a second operating mode (B2) to an analog signal source/sink (18a,b) for the audio signal (A), the line (12) is operated in the first operating mode (B1) as a digital data bus for data (D) and in the second operating mode (B2) as an analog signal line for transmitting an analog audio signal (A) from the signal source (18a) to the signal sink (18b).In a corresponding method, the line (12) is operated in a first operating mode (B1) as a digital data bus for transmitting data (D) and the line (12) is switched to the second operating mode (B2) for transmitting the audio signal (A), and the audio signal (A) is transmitted from the signal source (18a) via the line (12) to the signal sink (18b).