Linear filtering for noise-suppressed speech detection via multiple network microphone devices
First Claim
1. A first NMD (“
- NMD”
) comprising;
a plurality of microphones comprising a first microphone and a second microphone;
one or more processors;
a network interface; and
tangible, non-transitory, computer-readable media storing instructions executable by the one or more processors to cause the first NMD to perform operations comprising;
receiving an instruction to process one or more audio signals captured by a second NMD comprising a third microphone, wherein the first and second NMDs are separate devices that are positioned at different physical locations within an environment;
after receiving the instruction,functionally disabling the first microphone of the first NMD,capturing a first audio signal via the second microphone of the first NMD, wherein the first audio signal received at the first NMD comprises first noise content from a noise source, andreceiving over the network interface a second audio signal captured via at least the third microphone of the second NMD, wherein the second audio signal received at the second NMD comprises second noise content from the noise source;
identifying the first noise content in the first audio signal captured by the first NMD;
using the identified first noise content from the first NMD to determine an estimated noise content captured by at least the second microphone of the first NMD and the third microphone of the second NMD;
using the estimated noise content to suppress the first noise content in the first audio signal and the second noise content in the second audio signal;
generating a composite audio signal by combining the suppressed first audio signal and the suppressed second audio signal;
determining that the composite audio signal includes a voice input comprising a wake word; and
in response to the determination, processing the voice input to identify a voice utterance different from the wake word.
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Accused Products
Abstract
Systems and methods for suppressing noise and detecting voice input in a multi-channel audio signal captured by two or more network microphone devices include receiving an instruction to process one or more audio signals captured by a first network microphone device and after receiving the instruction (i) disabling at least a first microphone of a plurality of microphones of a second network microphone device, (ii) capturing a first audio signal via a second microphone of the plurality of microphones, (iii) receiving over a network interface of the second network microphone device a second audio signal captured via at least a third microphone of the first network microphone device, (iv) using estimated noise content to suppress first and second noise content in the first and second audio signals, (v) combining the suppressed first and second audio signals into a third audio signal, and (vi) determining that the third audio signal includes a voice input comprising a wake word.
605 Citations
20 Claims
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1. A first NMD (“
- NMD”
) comprising;a plurality of microphones comprising a first microphone and a second microphone; one or more processors; a network interface; and tangible, non-transitory, computer-readable media storing instructions executable by the one or more processors to cause the first NMD to perform operations comprising; receiving an instruction to process one or more audio signals captured by a second NMD comprising a third microphone, wherein the first and second NMDs are separate devices that are positioned at different physical locations within an environment; after receiving the instruction, functionally disabling the first microphone of the first NMD, capturing a first audio signal via the second microphone of the first NMD, wherein the first audio signal received at the first NMD comprises first noise content from a noise source, and receiving over the network interface a second audio signal captured via at least the third microphone of the second NMD, wherein the second audio signal received at the second NMD comprises second noise content from the noise source; identifying the first noise content in the first audio signal captured by the first NMD; using the identified first noise content from the first NMD to determine an estimated noise content captured by at least the second microphone of the first NMD and the third microphone of the second NMD; using the estimated noise content to suppress the first noise content in the first audio signal and the second noise content in the second audio signal; generating a composite audio signal by combining the suppressed first audio signal and the suppressed second audio signal; determining that the composite audio signal includes a voice input comprising a wake word; and in response to the determination, processing the voice input to identify a voice utterance different from the wake word. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- NMD”
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8. Tangible, non-transitory, computer-readable media storing instructions executable by one or more processors to cause a first NMD to perform operations comprising:
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receiving an instruction to process one or more audio signals captured by a second NMD; after receiving the instruction, (i) functionally disabling a first microphone of a plurality of microphones of the first NMD, (ii) capturing a first audio signal via a second microphone of the plurality of microphones, and (iii) receiving over a network interface of the first NMD a second audio signal captured via at least a third microphone of the second NMD, wherein the first audio signal comprises first noise content from a noise source and the second audio signal comprises second noise content from the noise source; identifying the first noise content in the first audio signal; using the identified first noise content to determine an estimated noise content captured by at least the second and third microphones; using the estimated noise content to suppress the first noise content in the first audio signal and the second noise content in the second audio signal; generating a composite audio signal by combining the suppressed first audio signal and the suppressed second audio signal; determining that the composite audio signal includes a voice input comprising a wake word; and in response to the determination, processing the voice input to identify a voice utterance different from the wake word. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method comprising:
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receiving an instruction to process one or more audio signals captured by a first NMD; after receiving the instruction, (i) functionally disabling a first microphone of a plurality of microphones of a second NMD, capturing a first audio signal via a second microphone of the plurality of microphones, and (iii) receiving over a network interface of the second NMD a second audio signal captured via at least a third microphone of the first NMD, wherein the first audio signal comprises first noise content from a noise source and the second audio signal comprises second noise content from the noise source; identifying the first noise content in the first audio signal; using the identified first noise content to determine an estimated noise content captured by at least the second and third microphones; using the estimated noise content to suppress the first noise content in the first audio signal and the second noise content in the second audio signal; generating a composite audio signal by combining the suppressed first audio signal and the suppressed second audio signal; determining that the composite audio signal includes a voice input comprising a wake word; and in response to the determination, processing the voice input to identify a voice utterance different from the wake word. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification