Spatial Correction for Multichannel Audio Signals
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Solution Overview
Problem
Existing acoustic field reproduction techniques face challenges in maintaining spatial reproducibility due to reflections and reverberations in the reproduction space, leading to a decrease in sound quality and presence, especially in large-scale systems where operation resources are overwhelmed by the need for extensive spatial correction processes.
Innovation Solution
A signal processing device that acquires multichannel audio signals using a microphone array, selects an appropriate spatial correction scheme based on spatial correction information and the number of speakers, and performs a spatial correction process using a spatial transfer characteristic matrix, allowing for optimized resource allocation and improved acoustic field reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spatial correction process is performed using a measured spatial transfer characteristic matrix in acoustic field reproduction, then spatial reproducibility is improved, but operation amount increases
Solution Approach 1:
The spatial transfer characteristic matrix is segmented into multiple spatial correction schemes based on different reflection components (e.g., early reflections, late reflections, reverberation). This allows selective application of correction processes tailored to specific spatial characteristics, reducing the overall operation amount while maintaining spatial reproducibility for critical components.
Solution Approach 2:
Different spatial correction schemes are applied to different spatial frequency components or time-frequency regions of the audio signal. By applying correction selectively to specific spatial domains rather than uniformly across all frequencies and time, the system improves spatial reproducibility where needed while reducing unnecessary operations in other regions.
2Measurement precision
If consistently all elements of the spatial transfer characteristic matrix are used for calculation of speaker drive signal, then spatial correction accuracy is improved, but operation amount increases significantly
Solution Approach 1:
Specific elements or subsets of the spatial transfer characteristic matrix are extracted and used for calculating speaker drive signals based on the desired spatial correction level. Instead of consistently using all matrix elements, the system extracts only the necessary components (e.g., diagonal elements for direct sound, specific off-diagonal elements for reflections), reducing operation amount while maintaining correction accuracy for essential spatial characteristics.
Solution Approach 2:
The system applies partial spatial correction by using only a subset of spatial correction schemes rather than applying all available correction elements. This partial action approach achieves sufficient spatial correction accuracy for most listening conditions without the excessive computational burden of using the complete spatial transfer characteristic matrix for all signal components.
3Reliability
If a large number of operation resources are allocated to spatial correction process, then spatial reproducibility is improved, but resources for other processes such as sound quality improvement are reduced
Solution Approach 1:
The spatial correction scheme selection is made dynamically based on the characteristics of the input audio signal and reproduction environment. The system adaptively chooses from multiple spatial correction schemes with different operation amounts, allowing flexible resource allocation that adjusts to content requirements. This dynamic approach enables better balance between spatial reproducibility and other processing needs depending on the specific audio content being reproduced.
Data Source
AI summary
The present technology relates to a signal processing device, a signal processing method, and a program, which are capable of reproducing an acoustic field more appropriately in accordance with content.A decoding unit decodes a multiplexed signal, and obtains a multichannel sound collection signal obtained by performing sound collection through a linear microphone array and spatial correction information for selecting a spatial correction scheme for correcting a spatial transfer characteristic. A spatial correction scheme selecting unit selects the spatial correction scheme on the basis of the spatial correction information, and a spatial transfer characteristic matrix generating unit outputs a spatial transfer characteristic matrix indicated by a selection result of the spatial correction scheme. A drive signal generating unit generates a speaker drive signal of a spatial frequency domain on the basis of the multichannel sound collection signal and the spatial transfer characteristic matrix. The present technology can be applied to a spatial correction controller.