Audio Energy Distribution Correction for Head-Mounted VR
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Solution Overview
Problem
In virtual reality environments, the audio signal energy distribution often fails to synchronize with the user's head movement, leading to a mismatch between the audio and visual experiences when the head-mounted device rotates.
Innovation Solution
A method and system that utilize a head-mounted device with a motion sensor, left and right speakers, and a processing device to detect the rotation angle, convert dual-channel audio signals to multi-channel signals, and adjust the energy distribution of four-channel audio signals based on defined acoustic source positions to generate synchronized left and right output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual-channel audio signals are used in head-mounted devices, then the device structure remains simple, but the audio energy distribution cannot synchronize with head movement causing mismatch between audio and visual experience
Solution Approach 1:
The audio signal processing is segmented into multiple independent channels (front left, front right, rear left, rear right) corresponding to different acoustic source positions. Each channel is processed independently with its own energy distribution correction, allowing the system to adapt to head rotation while maintaining manageable processing complexity through modular channel handling.
Solution Approach 2:
The system transitions from dual-channel stereo audio to multi-channel spatial audio by adding dimensional information about acoustic source positions in 3D space. This dimensional expansion enables the audio to represent sound sources from multiple directions, synchronizing with head movement in virtual reality environments.
2Reliability
If multi-channel audio signals with number of channels greater than or equal to 5 are generated, then audio energy distribution can match head movement, but the processing complexity increases
Solution Approach 1:
The system pre-defines four acoustic source positions (front left, front right, rear left, rear right) and pre-calculates the corresponding energy distribution characteristics for each position. When head rotation is detected, the system directly applies the appropriate pre-computed energy distribution correction, avoiding real-time complex calculations and reducing processing system complexity while maintaining high synchronization accuracy.
Solution Approach 2:
The system changes the energy distribution parameters of audio signals based on detected head rotation angles. By adjusting energy distribution across different channels according to the rotation angle and predefined acoustic source positions, the system achieves accurate audio-visual synchronization without requiring complex real-time spatial audio rendering.
3Reliability
If four acoustic source positions are defined for left and right speakers, then proper energy distribution correction is achieved, but the device structure becomes more complex
Solution Approach 1:
The system creates virtual acoustic sources at four predefined positions (front left, front right, rear left, rear right) through signal processing, rather than requiring physical speakers at each position. The left and right speakers generate audio signals that are processed to simulate sounds coming from these virtual positions, achieving accurate energy distribution correction without increasing physical device complexity.
Data Source
AI summary
A method and a system for correcting energy distributions of audio signal are proposed. The method is applicable to a head-mounted device having a motion sensor, a left speaker, and a right speaker and includes the following steps. A rotation angle of the head-mounted device is detected by the motion sensor. Dual-channel audio signals corresponding to the left and right speakers are obtained. The dual-channel audio signals are converted to multi-channel audio signals with the number of channels greater than or equal to 5. Four acoustic source positions of the left and right speakers are defined to convert the multi-channel audio signals to four-channel audio signals of the left and right speakers. Energy distributions of the four-channel audio signals of the left and right speakers are corrected according to the rotation angle and the four acoustic source positions to respectively generate a left output signal and a right output signal.