Cockpit Phased Array Audio for Headset-Free Pilot Communication
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Solution Overview
Problem
Conventional aircraft headsets for pilot communication are uncomfortable for long periods, block ambient cockpit sound, and disturb passengers during takeoff and landing due to loud alert signals.
Innovation Solution
A phased array speaker and microphone system that directs audio to the pilot's ears and focuses microphone pickup directly at the pilot's lips, using frequency band segmentation for enhanced clarity and reduced ambient noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional headsets are used for pilot communication, then clear communication with air traffic control is achieved, but the headsets become uncomfortable for long periods and block ambient cockpit sound
Solution Approach 1:
The patent replaces the mechanical headset system with an acoustic beamforming system using phased array speakers and microphones. The speaker array directs audio beams to pilots' ears, while the microphone array with electronic beamforming captures speech with directional selectivity, eliminating the need for physical headsets and restoring ambient sound access.
Solution Approach 2:
The flight deck audio system performs multiple functions: it provides clear communication with air traffic control, maintains ambient cockpit sound awareness, and enables inter-pilot communication without requiring separate headsets. The system integrates communication, alerting, and ambient sound functions into a unified acoustic field control system.
2Reliability
If alert signals are broadcast through the flight deck speaker system, then pilots can hear alerts over ambient noise, but passengers are disturbed during takeoff and landing when cockpit-cabin doors are open
Solution Approach 1:
The patent applies local quality by directing alert signals through acoustic beamforming to specific locations (pilots' ears) rather than broadcasting uniformly throughout the cockpit. The phased array speaker system creates localized acoustic zones, allowing alert signals to be heard clearly by pilots while minimizing acoustic energy propagation to the cabin area when doors are open.
Solution Approach 2:
The phased array speaker array acts as an intermediary between the alert signal source and the pilots' ears, shaping the acoustic field to deliver alerts selectively. The electronic beamforming controls the spatial distribution of acoustic energy, mediating between the need for audible alerts and the need to minimize passenger disturbance.
3Measurement precision
If the microphone pickup pattern is designed to reject sounds from other directions, then the pilot's voice is picked up clearly, but ambient noise rejection may interfere with capturing relevant cockpit sounds
Solution Approach 1:
The patent implements dynamic adaptability by making the microphone array's beamforming patterns electronically controllable and reconfigurable. The system can dynamically adjust pickup patterns based on operational context - using directional patterns for clear voice capture during communication, and broader patterns for ambient sound awareness during other phases of flight, providing both precision and versatility as needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables clear communication with air traffic control and alert sound reception without disturbing passengers, reducing reliance on headsets and minimizing noise interference.
Implementation Method 1
the system uses a phased array technique to direct the speaker audio to the pilot's and copilot's ears
Implementation Method 2
uses a similar phased array technique to focus the microphone pickup pattern directly at the pilot's and copilot's lips
Data Source
Figure 1~5B
Figure 2A~2F
Figure 2D~2E
AI summary
The pilot communication system (12) employs a transducer array (14, 16) of individual spaced apart speakers and/or microphones for deployment within the cockpit (10). A signal processing circuit interfaces with the transducer array (14, 16) and also with the aircraft avionics communication system (11), and selectively applies different time delays to the individual speakers and/or microphones to create in the array an acoustic beam (22, 24) having steerable coverage within the acoustic space of the cockpit (10). By adjusting the time delays the signal processing circuit directs and focuses sound from the speakers to the pilot (20) and similarly focuses the microphones on the pilot's mouth. In this way the pilots (20) can communicate with each other and with air traffic control without the need to wear headsets. The system also significantly reduces flight deck warnings from being introduced into the cabin environment.