Sound Signal Processing Device Spatial Expansion
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Solution Overview
Problem
Existing sound signal processing technologies fail to effectively achieve sound image localization corresponding to the position of a sound source in a space, leading to a lack of richness and spatial expansion in sound experiences.
Innovation Solution
A sound signal processing method and device utilizing a combination of directional and omnidirectional microphones, FIR filters, and a sound signal processor to generate and control early reflected and reverberant sound signals, adjusting gain and delay to accurately replicate sound waves and enhance spatial awareness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reverberant sound is added to support sound field, then acoustic characteristics are improved, but sound image localization becomes blurred
Solution Approach 1:
The patent segments the reverberant sound into multiple early reflected sound components, each with distinct spatial characteristics. By processing and controlling each component separately through individual gain and delay adjustments, the system maintains sound image localization while providing rich reverberant effects.
Solution Approach 2:
The patent applies different processing parameters (gain and delay) to different reflected sound components based on their specific spatial characteristics. This local quality approach allows each reflected sound to be optimized for its particular direction and timing, preserving localization accuracy while enhancing overall acoustic quality.
2Adaptability or versatility
If physical changes are made to alter reverberation characteristics, then acoustic performance is improved, but facility complexity and space requirements increase
Solution Approach 1:
The patent replaces physical mechanical changes to the facility structure with electronic signal processing. By using digital processing to generate and control reflected sound components, the system achieves variable reverberation characteristics without any physical modifications to the hall architecture.
Solution Approach 2:
The patent changes acoustic characteristics by adjusting processing parameters (gain and delay) rather than physical parameters. This allows dynamic control of reverberation properties through software, eliminating the need for physical facility changes.
3Measurement precision
If multiple reflected sound components are processed with different parameters, then sound image localization is improved, but processing complexity increases
Solution Approach 1:
The patent performs preliminary separation of the reverberant sound into distinct early reflected sound components before processing. By pre-organizing the sound field data and identifying specific reflection paths in advance, the system simplifies subsequent processing while maintaining accurate localization.
Data Source
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AI summary
A sound signal processing method includes: obtaining a plurality of sound signals respectively collected by a plurality of microphones (11A-11C, 12A-12C) arranged in a space; adjusting respective levels of the plurality of sound signals in accordance with respective positions of the plurality of microphones (11A-11C, 12A-12C); mixing the plurality of sound signals having the adjusted respective levels to thereby obtain a mixed signal; and generating a reflected sound by using the obtained mixed signal.