Microphone signal fusion
First Claim
1. A method for fusion of microphone signals, the method comprising:
- receiving a first signal including at least a voice component, the voice component of the first signal having a first frequency response, and a second signal including at least the voice component, the voice component of the second signal having a second frequency response that is modified from the first frequency response by at least transmission of the voice component through a human tissue;
processing the first signal to obtain first noise estimates;
aligning the voice component in the second signal spectrally with the voice component in the first signal by applying a filter to the second signal that causes the second frequency response to be altered toward the first frequency response within a bandwidth of the voice component of the second signal; and
blending, based at least on the first noise estimates, the first signal and the aligned voice component in the second signal to generate an enhanced voice signal.
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Abstract
Provided are systems and methods for microphone signal fusion. An example method commences with receiving a first and second signal representing sounds captured, respectively, by external and internal microphones. The internal microphone is located inside an ear canal and sealed for isolation from outside acoustic signals. The external microphone is located outside the ear canal. The first signal comprises a voice component. The second signal comprises a voice component modified by at least human tissue. The first and second signals are processed to obtain noise estimates. The voice component of the second signal is aligned with the voice component of the first signal. The first signal and the aligned voice component of the second signal are blended, based on the noise estimates, to generate an enhanced voice signal. Prior to aligning, the voice component of the second signal may be processed to emphasize high frequency content, improving effective alignment bandwidth.
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Citations
19 Claims
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1. A method for fusion of microphone signals, the method comprising:
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receiving a first signal including at least a voice component, the voice component of the first signal having a first frequency response, and a second signal including at least the voice component, the voice component of the second signal having a second frequency response that is modified from the first frequency response by at least transmission of the voice component through a human tissue; processing the first signal to obtain first noise estimates; aligning the voice component in the second signal spectrally with the voice component in the first signal by applying a filter to the second signal that causes the second frequency response to be altered toward the first frequency response within a bandwidth of the voice component of the second signal; and blending, based at least on the first noise estimates, the first signal and the aligned voice component in the second signal to generate an enhanced voice signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for fusion of microphone signals, the system comprising:
a digital signal processor, configured to; receive a first signal including at least a voice component, the voice component of the first signal having a first frequency response, and a second signal including at least the voice component, the voice component of the second signal having a second frequency response that is modified from the first frequency response by at least transmission of the voice component through a human tissue; process the first signal to obtain first noise estimates; align the voice component in the second signal spectrally with the voice component in the first signal by applying a filter to the second signal that causes the second frequency response to be altered toward the first frequency response within a bandwidth of the voice component of the second signal; and blend, based at least on the first noise estimates, the first signal and the aligned voice component in the second signal to generate an enhanced voice signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer-readable storage medium having embodied thereon instructions, which, when executed by at least one processor, perform steps of a method, the method comprising:
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receiving a first signal including at least a voice component, the voice component of the first signal having a first frequency response, and a second signal including at least the voice component, the voice component of the second signal having a second frequency response that is modified from the first frequency response by at least transmission of the voice component through a human tissue, the first signal representing at least one sound captured by an external microphone located outside the ear canal, and the second signal representing at least one sound captured by an internal microphone located inside an ear canal; processing the first signal to obtain first noise estimates; aligning the voice component in the second signal spectrally with the voice component in the first signal by applying a filter to the second signal that causes the second frequency response to be altered toward the first frequency response within a bandwidth of the voice component of the second signal; and blending, based at least on the first noise estimates, the first signal and the aligned voice component in the second signal to generate an enhanced voice signal; the voice component of the second signal, representing the at least one sound captured by the internal microphone, comprising low frequency content and high frequency content and, prior to the aligning, processing the voice component of the second signal, representing the at least one sound captured by the internal microphone, to emphasize the high frequency content.
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Specification