Microphone Array Noise Suppression via Dynamic Range Adjustment
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Solution Overview
Problem
Microphone array devices face challenges in accurately suppressing noise while maintaining the quality of target sounds, as they often erroneously recognize target sounds as noise due to environmental fluctuations and changes in sound reception direction or range, leading to distortion of the target sound signal.
Innovation Solution
A microphone array device that uses two microphones to differentiate between target and non-target sounds by evaluating noise states and adjusting suppression amounts based on noise level and noise level changes, controlling directivity to separate target sounds from noise, and adjusting sound reception and suppression ranges to minimize distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the microphone array device suppresses noise from the suppression direction, then noise suppression is improved, but target sounds may be erroneously recognized as noise and distorted
Solution Approach 1:
The patent applies dynamics by making the sound reception range and suppression range adjustable and changeable based on environmental conditions. The ranges are not fixed but can be dynamically modified to adapt to changing acoustic environments, allowing the system to optimize between noise suppression and target sound preservation in different scenarios
Solution Approach 2:
The patent changes parameters by adjusting the noise suppression gain based on the identified sound source range. The gain is not a fixed value but varies according to the detected sound source position and environmental conditions, enabling flexible control over the balance between noise suppression and target sound quality
2Device complexity
If the sound reception range and suppression range are fixed, then device complexity is reduced, but adaptability to environmental changes deteriorates
Solution Approach 1:
The patent makes the sound reception range and suppression range dynamic rather than fixed. These ranges can be adjusted based on environmental fluctuations and sound source positions, allowing the system to adapt to different acoustic scenarios without requiring complete reconfiguration of the device architecture
3Object-affected harmful factors
If noise suppression gain is increased, then noise suppression is improved, but distortion of target sounds increases
Solution Approach 1:
The patent uses parameter changes by adjusting the noise suppression gain based on the identified sound source range and environmental conditions. The gain is optimized to provide sufficient noise suppression while preserving target sound quality, preventing excessive suppression that would cause distortion
Data Source
AI summary
A microphone array device includes a first sound reception unit configured to obtain a first sound signal that is input from a first microphone, a second sound reception unit configured to obtain a second sound signal that is input from a second microphone, a noise state evaluation unit configured to compare the first sound signal and the second sound signal and to obtain an evaluation parameter to evaluate an influence of a non-target sound included in the second sound signal on a target sound included in the first sound signal according to a result of the comparison, a subtraction adjustment unit configured to set a suppression amount for the second sound signal based on the evaluation parameter and to generate a third sound signal; and a subtraction unit configured to generate a signal to be output based on the third sound signal and the first sound signal.