Microphone Array Sound Pick-Up Stabilization
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Solution Overview
Problem
Existing sound pick-up apparatuses face challenges in stabilizing sound volume when extracting target area sounds, as the output sound decreases with the distance of the target area sound source from the microphone array and directional dependency, leading to unstable sound pick-up and increased processing complexity.
Innovation Solution
A sound pick-up apparatus that includes directionality formation, correction coefficient calculation, main microphone array selection, and target area sound extraction mechanisms to stabilize sound pick-up by forming directionality in the target area, calculating correction coefficients to equalize target area sound components across microphone arrays, and selecting a main microphone array for efficient extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple microphone arrays are used for area sound pick-up, then sound coverage in target area is improved, but processing complexity and computational load increase
Solution Approach 1:
The patent divides the processing into two independent stages: (1) beamforming processing for each microphone array to extract target area sounds, and (2) amplitude spectrum correction processing to combine results. This segmentation allows parallel processing of multiple microphone arrays without increasing overall system complexity, as each array can be processed independently through the same pipeline.
Solution Approach 2:
The patent applies amplitude spectrum correction using correction coefficients to adjust the output amplitude spectra of beamformers. By changing the amplitude parameter through mathematical correction rather than physical modification, the system maintains stable sound volume across multiple arrays without adding physical complexity.
2Measurement precision
If beamforming is applied to extract target area sounds, then directionality is improved, but sound volume varies with distance and direction
Solution Approach 1:
The patent calculates correction coefficients based on the ratio of amplitude spectra from multiple microphone arrays and applies this feedback to correct the output amplitude spectrum. This closed-loop approach compensates for distance and direction variations, ensuring stable sound volume while maintaining beamforming directionality.
Solution Approach 2:
The patent equalizes the amplitude spectra of target area sounds extracted by multiple microphone arrays by applying correction coefficients. This creates equipotential conditions where all arrays contribute equally to the final output, eliminating volume variations caused by different positions and orientations.
3Reliability
If correction coefficients are calculated for all microphone arrays, then sound volume stability is improved, but computational throughput decreases
Solution Approach 1:
The patent extracts only the amplitude spectrum information from beamformer outputs to calculate correction coefficients, rather than processing the full time-domain signals. This extraction approach reduces computational complexity and maintains throughput while achieving volume stability through amplitude correction.
Data Source
AI summary
To perform an efficient and stable area sound pick-up process. The present invention relates to a sound pick-up apparatus. The sound pick-up apparatus according to the present invention includes: a means for acquiring target direction signals on the basis of beamformers of input signals supplied by a plurality of microphone arrays; a means for calculating correction coefficients for approximating target area sound components to each other, the target area sound components being included in the respective target direction signals of the plurality of microphone arrays; a means for selecting a main microphone array on the basis of the correction coefficients, the main microphone array being to be used as a criterion for extracting target area sound; and a means for correcting the target direction signals of the respective microphone arrays by using the correction coefficients with respect to the main microphone array, and extracting the target area sound on the basis of the corrected target direction signals of the respective microphone arrays.