Sound Signal Coherent Noise Filtering via Delay Processing
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Solution Overview
Problem
Existing sound signal processing methods, such as beamforming algorithms, face challenges in effectively eliminating coherent noise sources with strong correlation, which can lead to poor noise reduction and sound enhancement performance.
Innovation Solution
A method involving delay processing of sound signals received by two sound reception apparatuses to determine signal correlation coefficients, identifying and filtering out coherent noise signals, thereby improving the noise reduction and sound enhancement effects during sound signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming algorithm is used to process sound signals, then sound signal enhancement and noise reduction are achieved, but coherent noise signals with strong correlation cannot be effectively eliminated
Solution Approach 1:
The patent performs delay processing on sound signals before correlation analysis to align signals from the same source. By pre-processing signals with known reception delay constants, the method enables accurate distinction between coherent noise and target sounds, allowing effective filtering of coherent noise while preserving useful sound signals.
Solution Approach 2:
The patent introduces signal correlation coefficient as an intermediary metric to evaluate the relationship between processed sound signals. This intermediary measure enables the system to identify and filter coherent noise signals by detecting their strong correlation characteristics, thereby resolving the contradiction between noise reduction and coherent noise elimination.
2Measurement precision
If delay processing and correlation analysis are performed to identify coherent noise, then coherent noise filtering accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent pre-calculates and stores reception delay constants between different sound reception apparatuses before actual signal processing. This preliminary action eliminates the need for real-time delay calculation during signal processing, reducing computational complexity while maintaining accurate delay compensation for correlation analysis.
Solution Approach 2:
The patent transforms the complex problem of coherent noise identification into a simpler parameter comparison task by using signal correlation coefficients. By changing the approach from analyzing complex signal relationships to comparing scalar correlation values, the method achieves high detection accuracy with reduced processing complexity.
Data Source
AI summary
A method, an apparatus and a device for processing sound signals are provided in the present application. The method comprises: receiving a first sound signal through a first sound reception apparatus and a second sound signal through a second sound reception apparatus respectively; the first sound reception apparatus and the second sound reception apparatus have a corresponding reception delay constant therebetween; performing delay processing on the first sound signal according to the reception delay constant at each signal processing time to acquire a signal correlation coefficient between the first sound signal after the delay processing and the second sound signal; detecting whether the first sound signal and the second sound signal include a coherent noise signal according to the signal correlation coefficient between the first sound signal after the delay processing and the second sound signal; filtering out the coherent noise signal from the first sound signal and the second sound signal when the coherent noise signal is included in the first sound signal and the second sound signal to acquire and output a target sound signal at a corresponding signal processing time.