Spatial selectivity noise reduction tradeoff for multi-microphone systems
First Claim
1. A method for controlling adaptivity of noise reduction in an acoustic signal, the method comprising:
- receiving a primary acoustic signal at a first microphone and a secondary acoustic signal at a second microphone;
determining a spatial coefficient based on a difference between the primary and secondary acoustic signals, the spatial coefficient indicating a positional orientation of the first and second microphones relative to a speech source; and
reducing an energy level of a noise component in the primary acoustic signal based on the spatial coefficient when the spatial coefficient satisfies a configurable threshold.
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Abstract
The present technology provides noise reduction of an acoustic signal using a configurable classification threshold which provides a sophisticated level of control to balance the tradeoff between positional robustness and noise reduction robustness. The configurable classification threshold corresponds to a configurable spatial region, such that signals arising from sources within the configurable spatial region are preserved, and signals arising from sources outside it are rejected. In embodiments, the configurable classification threshold can be automatically and dynamically adjusted in real-time based on evaluated environmental conditions surrounding an audio device implementing the noise reduction techniques described herein.
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Citations
24 Claims
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1. A method for controlling adaptivity of noise reduction in an acoustic signal, the method comprising:
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receiving a primary acoustic signal at a first microphone and a secondary acoustic signal at a second microphone; determining a spatial coefficient based on a difference between the primary and secondary acoustic signals, the spatial coefficient indicating a positional orientation of the first and second microphones relative to a speech source; and reducing an energy level of a noise component in the primary acoustic signal based on the spatial coefficient when the spatial coefficient satisfies a configurable threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory computer readable storage medium having embodied thereon a program, the program being executable by a processor to perform a method for controlling adaptivity of noise reduction in an acoustic signal, the method comprising:
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receiving a primary acoustic signal at a first microphone and a secondary acoustic signal at a second microphone; determining a spatial coefficient based on a difference between the primary and secondary acoustic signals, the spatial coefficient indicating a positional orientation of the first and second microphones relative to a speech source; and reducing an energy level of a noise component in the primary acoustic signal based on the spatial coefficient when the spatial coefficient satisfies a configurable threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system for controlling adaptivity of noise reduction in an acoustic signal, the system comprising:
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a first microphone to receive a primary acoustic signal; a second microphone to receive a secondary acoustic signal; and a noise reduction module to; determine a spatial coefficient based on a difference between the primary and secondary acoustic signals, the spatial coefficient indicating a positional orientation of the first and second microphones relative to a speech source; and reduce an energy level of a noise component in the primary acoustic signal based on the spatial coefficient when the spatial coefficient satisfies a configurable threshold. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification