Acoustic Signal Mixing Device for VR Sound Field Alignment
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Solution Overview
Problem
Existing techniques fail to effectively adjust the range of a sound field for acoustic signals collected by three or more microphones in virtual reality systems, which leads to discrepancies between the user's field of view and the sound field.
Innovation Solution
A mixing device that processes acoustic signals from multiple microphones using sets of two microphones, applying scaling, shift, and attenuation factors to generate balanced sound channels for speakers, allowing for adjustable sound field ranges based on microphone positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If acoustic signals from multiple microphones are directly mixed and output at the same level, then the mixing process is simple, but the sound field range does not match the user's field of view
Solution Approach 1:
The patent applies parameter changes by introducing scaling factors and shift factors that modify the acoustic signals based on the relationship between the sound field range and field of view. The scaling factor adjusts the sound field range by scaling the acoustic signals, while the shift factor corrects positional discrepancies, thereby achieving accurate sound field alignment without complicating the mixing process
2Manufacturing precision
If acoustic signals are processed to match sound field range with field of view, then the accuracy of sound field reproduction is improved, but the processing complexity increases
Solution Approach 1:
The patent uses parameter changes to achieve accurate sound field reproduction by applying scaling factors and shift factors to the acoustic signals. These parameters are calculated based on the geometric relationships between microphone positions and the desired sound field range, allowing precise control without requiring complex processing algorithms
Solution Approach 2:
The patent segments the processing of acoustic signals by handling each microphone's signal independently through its own processing unit. Each unit applies the scaling and shift factors to its corresponding acoustic signal, and then the processed signals are combined. This segmentation simplifies the overall processing complexity while maintaining accuracy
3Ease of manufacture
If only two microphones are used for sound field adjustment, then the processing is straightforward, but the system cannot handle three or more microphones
Solution Approach 1:
The patent achieves universality by designing a processing system that can handle any number of microphones (two or more) using the same fundamental approach. The processing units are configured based on microphone positions, and the scaling/shift factors are calculated accordingly, allowing the system to adapt to different microphone configurations without requiring different processing methods
Data Source
AI summary
A mixing device includes: processing units each provided for a set of two microphones, each processing unit being configured to process acoustic signals output by the corresponding set of two microphones to output a first acoustic signal and a second acoustic signal; a first adding units configured to add up the first acoustic signals; and a second adding unit configured to add up the second acoustic signals. Each processing unit processes the acoustic signals output by the corresponding set of two microphones, based on a scaling factor that determines a scaling up/down rate of a sound field, a shift factor that determines a shift amount of the sound field, and attenuation factors that determine attenuation amounts of the acoustic signals output by the microphones.