Method and apparatus for wind noise detection and suppression using multiple microphones
First Claim
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1. An apparatus for detecting and suppressing wind noise in a primary signal received by a primary microphone, the apparatus comprising:
- a reference signal adjustment processor, in communication with a memory, configured to adjust a reference signal received by a reference microphone based on a difference between a parameter of the reference signal and a parameter of the primary signal to provide an adjusted reference signal, wherein the parameter of the reference signal and the parameter of the primary signal is a delay, gain, spectral shape, or background noise level, wherein the reference signal is adjusted to better match the parameter of the reference signal to the parameter of the primary signal; and
a waveform substitution processor, in communication with a memory, configured to substitute at least a portion of a frame of samples of the primary signal with at least a portion of a frame of samples of the adjusted reference signal if a primary microphone wind noise detection signal indicates that wind noise is present or above a first threshold in the frame of samples of the primary signal and a reference microphone wind noise detection signal indicates the wind noise is absent or below a second threshold in the frame of samples of the adjusted reference signal.
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Abstract
Unlike sound based pressure waves that go everywhere, air turbulence caused by wind is usually a fairly local event. Therefore, in a system that utilizes two or more spatially separated microphones to pick up sound signals (e.g., speech), wind noise picked up by one of the microphones often will not be picked up (or at least not to the same extent) by the other microphone(s). Embodiments of methods and apparatuses that utilize this fact and others to effectively detect and suppress wind noise using multiple microphones that are spatially separated are described.
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Citations
32 Claims
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1. An apparatus for detecting and suppressing wind noise in a primary signal received by a primary microphone, the apparatus comprising:
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a reference signal adjustment processor, in communication with a memory, configured to adjust a reference signal received by a reference microphone based on a difference between a parameter of the reference signal and a parameter of the primary signal to provide an adjusted reference signal, wherein the parameter of the reference signal and the parameter of the primary signal is a delay, gain, spectral shape, or background noise level, wherein the reference signal is adjusted to better match the parameter of the reference signal to the parameter of the primary signal; and a waveform substitution processor, in communication with a memory, configured to substitute at least a portion of a frame of samples of the primary signal with at least a portion of a frame of samples of the adjusted reference signal if a primary microphone wind noise detection signal indicates that wind noise is present or above a first threshold in the frame of samples of the primary signal and a reference microphone wind noise detection signal indicates the wind noise is absent or below a second threshold in the frame of samples of the adjusted reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for detecting and suppressing wind noise in a primary signal received by a primary microphone. the method comprising:
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adjusting a reference signal received by a reference microphone based on a difference between a parameter of the reference signal and a parameter of the primary signal to provide an adjusted reference signal, wherein the parameter of the reference signal and the parameter of the primary signal is a delay, gain, spectral shape, or background noise level, wherein the reference signal is adjusted to better match the parameter of the reference signal to the parameter of the primary signal; and substituting at least a portion of a frame of samples of the primary signal with at least a portion of a frame of samples of the adjusted reference signal if a primary microphone wind noise detection signal indicates that wind noise is present or above a first threshold in the frame of samples of the primary signal and a reference microphone wind noise detection signal indicates the wind noise is absent or below a second threshold in the frame of samples of the adjusted reference signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification