Head-Mounted Device Far-Field Muffling via Speaker Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current head-mounted devices with dual-speaker designs for VR or AR applications face challenges in far-field muffling due to design tolerances and assembly errors, affecting frequency response and phase differences, which impact sound leakage and user experience.
Innovation Solution
A far-field muffling method for head-mounted devices that uses a monitoring microphone to receive sound signals, determines compensation signals for the speakers, and adjusts their amplitude and phase to meet preset requirements, continuously refining the muffling effect until the sound signal meets the criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a dual-speaker solution is used for far-field muffling, then the symmetry of structural design is improved, but frequency response and phase difference between speakers deteriorate due to design tolerances and assembly errors
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the amplitude and phase parameters of audio signals sent to each speaker based on real-time feedback from the microphone. The processing unit modifies these parameters to compensate for frequency response and phase differences caused by manufacturing tolerances and assembly errors, thereby maintaining far-field muffling performance while accommodating manufacturing variations.
Solution Approach 2:
The patent implements feedback by using a microphone to capture sound signals and feeding them back to the processing unit. This feedback loop enables the system to detect actual sound leakage and adjust speaker output accordingly, compensating for manufacturing imperfections and maintaining symmetric muffling performance despite variations in speaker characteristics.
2Ease of manufacture
If design tolerances and assembly errors are present, then ease of manufacture is improved, but far-field muffling performance deteriorates
Solution Approach 1:
The patent applies self-service by enabling the system to automatically detect and compensate for its own manufacturing imperfections. The microphone captures sound leakage caused by assembly variations, and the processing unit autonomously adjusts speaker parameters to correct these issues, allowing the system to self-correct without requiring precise manual assembly or additional calibration steps.
Solution Approach 2:
The feedback mechanism allows the system to monitor actual muffling performance and adjust speaker output in real-time, compensating for assembly errors and maintaining reliable far-field muffling performance despite variations in manufacturing tolerances and assembly precision.
3Reliability
If compensation signals are continuously adjusted, then far-field muffling performance is improved, but device complexity increases
Solution Approach 1:
The feedback-based compensation system uses simple microphone feedback to automatically adjust speaker parameters, avoiding the need for complex manual calibration procedures. The processing unit implements straightforward amplitude and phase adjustments based on real-time sound level detection, maintaining effective muffling performance while keeping the overall system complexity manageable.
Data Source
AI summary
The present disclosure provide a far-field muffling method for a head-mounted device, apparatus and system, which is applied to the head-mounted device. The head-mounted device comprises a first speaker, a second speaker, and further comprises a monitoring microphone. The method comprises: receiving a monitoring sound signal picked up by the monitoring microphone during operations of the first speaker and the second speaker; judging whether the monitoring sound signal satisfies a preset requirement, and if yes, ending; if not, determining a current first target compensation signal and a current second target compensation signal from preset various compensation signals; compensating the first speaker by using the first target compensation signal, compensating the second speaker by using the second target compensation signal, and returning to the receiving a monitoring sound signal picked up by the monitoring microphone.