Microphone Beam Gain Control for External Mic Handover
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Solution Overview
Problem
The integration of microphone arrays and external microphones in videoconferencing systems often results in reduced audio quality due to varying sensitivities, room configurations, and sound quality differences, leading to inconsistent audio mixing that can disturb remote participants.
Innovation Solution
An automated audio control system that adjusts the gain of microphone beams based on the position of the speaking participant relative to the closest external microphone, minimizing overlap between beam and external microphone pickup zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio from both microphone beams and external microphones is mixed together, then the system can capture audio from multiple sources, but the audio quality is reduced due to varying sensitivities and overlapping pickup zones
Solution Approach 1:
The system applies different gain levels to different audio sources based on the talking participant's position. When the participant is far from the video endpoint, the beam gain is reduced in favor of the external microphone, and vice versa. This local optimization of gain distribution resolves the contradiction by ensuring high audio quality for each specific scenario while maintaining overall system versatility.
Solution Approach 2:
The system dynamically adjusts the gain of microphone beams based on the real-time position of the talking participant. This dynamic control allows the system to adapt to changing conditions during the videoconference, switching between beam and external microphone dominance as needed, thereby maintaining high audio quality while preserving multi-source capture capability.
2Adaptability or versatility
If the microphone array uses multiple beams to capture audio from different directions, then the system can monitor multiple participants, but the gain control becomes complex when selecting which beam to prioritize
Solution Approach 1:
The system uses feedback from the talking participant detection mechanism to automatically control the gain of each beam. The audio control receives information about which participant is talking and their position, then automatically adjusts the beam gains accordingly. This feedback loop simplifies the gain control complexity by removing the need for manual intervention while maintaining multi-directional capture capability.
Solution Approach 2:
The audio control system automatically manages the gain distribution among multiple beams based on the detected talking participant's position. The system serves itself by making autonomous decisions about which beam to prioritize, eliminating the need for external manual control and reducing operational complexity while preserving adaptability to different speaking scenarios.
3Length of stationary object
If external microphones are placed on the conference table to capture audio from participants, then audio can be captured from farther distances, but the pickup zones may overlap with microphone beams causing audio mixing issues
Solution Approach 1:
The system applies different gain levels to external microphones and beams based on the talking participant's position relative to each source. When a participant is closer to an external microphone, that microphone's gain is increased while beam gain is reduced, and vice versa. This local optimization ensures consistent audio mixing by always prioritizing the closest audio source, resolving the overlap issue while maintaining extended capture range.
Solution Approach 2:
The system uses partial action by selectively activating or emphasizing either external microphones or beams based on the speaking scenario, rather than always mixing all sources at equal levels. This selective approach reduces the harmful overlap effects while preserving the extended capture range capability, improving audio mixing consistency without sacrificing coverage.
Data Source
AI summary
A method to control audio in a videoconference. The method includes operating a videoconference session with a videoconference endpoint that is configured to pick up audio via (i) a plurality of beams associated with a microphone array and (ii) at least one external microphone, determining a position of a talking participant in the videoconference session, and in response to the position of the talking participant being further away from the videoconference endpoint than a position of the at least one external microphone, reducing a gain for a selected beam of the plurality of beams in favor of a gain for the at least one external microphone.