3D Microphone Array Formation Through TDOA Calibration
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Solution Overview
Problem
Current audio conference systems face challenges in managing high-quality audio due to variable room dimensions, dynamic seating, unknown microphone and speaker locations, and unknown noise sources, requiring complex manual calibration and failing to form a cohesive microphone array in real-time.
Innovation Solution
A system that automatically locates microphones in 3D space to form a single physical microphone array by calculating time differences of arrival (TDOA) between calibration signals, allowing real-time integration of ad-hoc microphone elements into a unified array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual calibration is used to configure microphone systems, then audio performance can be optimized for specific setups, but the system complexity and installation difficulty increase significantly
Solution Approach 1:
The system performs automatic calibration without requiring manual intervention. The microphone array autonomously determines the locations of sound sources and optimizes beamforming weights through self-calibration, eliminating the need for technicians to manually configure the system while maintaining optimal audio performance
Solution Approach 2:
The system dynamically adjusts beamforming weights and other audio parameters based on automatically determined microphone and sound source locations. By changing these parameters adaptively rather than requiring manual setup, the system achieves optimal performance while reducing installation complexity
2Area of stationary object
If multiple microphones are placed at various locations to cover large spaces, then room coverage improves, but the difficulty of installation and configuration increases
Solution Approach 1:
The system replaces manual mechanical positioning and configuration with acoustic field-based automatic location determination. By using sound propagation characteristics to automatically determine microphone positions and form the array geometry, the system eliminates the need for complex manual installation and configuration procedures
Solution Approach 2:
The automatic calibration system provides universal applicability across different room sizes and microphone configurations. The same automated process works whether microphones are placed on tables, mounted on walls, or positioned in the ceiling, making the system equally easy to install in small meeting rooms or large conference halls
3Ease of manufacture
If microphone locations are unknown, then system setup is simpler, but calibration and optimization become difficult
Solution Approach 1:
The system performs preliminary automatic location determination of sound sources before finalizing the beamforming configuration. By first determining where sound sources are located in the room, the system can then optimally configure the microphone array weights and parameters, achieving both simple setup and precise calibration
Solution Approach 2:
The system uses feedback from the acoustic field to automatically determine microphone locations and optimize performance. By analyzing the sound field characteristics and using this feedback to adjust the beamforming weights and array geometry, the system achieves precise calibration without manual intervention
4Reliability
If microphones operate independently, then individual microphone performance is maintained, but forming a cohesive array requires complex switching and management logic
Solution Approach 1:
The system merges multiple independent microphones into a unified beamforming array by automatically determining their relative positions in space. Through automatic calibration that establishes the geometric relationships between microphones, the system combines their signals with appropriate weights to form a cohesive array that maintains individual microphone performance while achieving coordinated operation
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 full room coverage with optimal audio quality by dynamically forming a single microphone array, adapting to changes in microphone placement and noise levels without manual calibration, enhancing echo cancellation and gain management.
Implementation Method 1
calculating time differences of arrival (TDOA) between calibration signals
Data Source
AI summary
An audio conference system for automatically forming a single combined physical microphone array aperture across associated and/or disassociated ad-hoc microphone elements in a shared 3D space is provided. The audio conference system includes a plurality of microphone/speaker units, each including at least one microphone and/or at least one speaker and a system processor communicating with the microphone/speaker units. The system processor instructs the microphone/speaker units to transmit unique calibration signals sequentially or simultaneously and to calculate time difference of arrival (TDOA) between the microphone/speaker units. A physical array structure of the microphone/speaker units is obtained based on TDOA between the microphone/speaker units, and a consolidated target coverage zone common to the microphone/speaker units is generated based on the physical array structure.