Microphone Array Signal Compensation for Obstacle Diffraction
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Solution Overview
Problem
Microphone arrays in sound recognition systems face challenges due to obstacle structures between microphones, which cause sound wave diffraction or reflection, affecting beamforming processing and reducing sound recognition rates.
Innovation Solution
A method and apparatus that select a target microphone group and acquire signal compensation information to perform signal compensation processing, ensuring the signal difference between microphones meets the requirements for planar arrays, thereby eliminating the effects of obstacle structures and improving sound recognition rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the microphone array is installed on a side or bottom of the product due to structural constraints, then the product structure is adaptable, but obstacle structures are formed between microphones causing sound wave diffraction or reflection
Solution Approach 1:
The patent pre-calculates and stores compensation parameters for different microphone positions and obstacle configurations before actual sound signal processing. When the system operates, it directly applies the pre-computed compensation parameters to correct the sound signals, avoiding the need for real-time complex calculations and enabling quick adaptation to different structural configurations.
Solution Approach 2:
The patent introduces compensation parameters that modify the original sound signal parameters (amplitude, phase, time delay) to counteract the effects of obstacle structures. By adjusting these parameters based on the specific microphone array configuration and obstacle positions, the system restores the sound signal characteristics to what they would be in an obstacle-free planar array configuration.
2Reliability
If signal compensation processing is performed to eliminate obstacle structure effects, then sound recognition rate is improved, but processing complexity increases
Solution Approach 1:
The patent pre-calculates compensation parameters including time delays, amplitude adjustments, and phase corrections for various microphone positions and obstacle configurations. These parameters are stored in a lookup table or database, allowing the system to quickly retrieve and apply the appropriate compensation without performing complex real-time calculations during sound signal processing.
Solution Approach 2:
The patent divides the compensation process into separate independent steps: time delay compensation, amplitude compensation, and phase compensation. Each compensation parameter is calculated and applied independently, simplifying the overall processing complexity while achieving the cumulative effect of eliminating obstacle structure influences on sound recognition.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively compensates for signal differences caused by obstacle structures, ensuring the performance of beamforming processing and enhancing sound recognition rates in microphone arrays.
Implementation Method 1
the microphone array will be affected by sound wave diffraction or sound wave reflection caused by the obstacle structure
Implementation Method 2
the microphone array will be affected by sound wave diffraction or sound wave reflection caused by the obstacle structure
Data Source
AI summary
Disclosed are a microphone array-based sound signal processing method, apparatus and device. The method comprises: selecting, from a microphone array, a target microphone combination which is used for receiving a sound signal of a target sound source, the target microphone combination comprising a first microphone and at least one second microphone; obtaining target compensation information corresponding to the target microphone combination, the target compensation information comprising a signal compensation parameter of each second microphone with respect to the first microphone; according to the target compensation information, performing signal compensation processing on a second sound signal received by means of the second microphone; and according to the second sound signal subjected to the signal compensation processing and a first sound signal received by means of the first microphone, obtaining a target sound signal and outputting same.