Adaptive beamforming method and apparatus using feedback structure
First Claim
1. An adaptive beamforming method, comprising:
- compensating for time delays of M noise-containing speech signals input via a microphone array having M microphones, wherein M is an integer greater than or equal to 2, and generating a sum signal of the M compensated noise-containing speech signals; and
extracting pure noise components from the M compensated noise-containing speech signals using M adaptive blocking filters that are connected to M adaptive canceling filters in a feedback structure and extracting pure speech components from the sum signal using the M adaptive canceling filters that are connected to the M adaptive blocking filters in the feedback structure.
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Abstract
An adaptive beamforming apparatus and method includes a fixed beamformer that compensates for time delays of M noise-containing speech signals input via a microphone array having M microphones (M is an integer greater than or equal to 2), and generates a sum signal of the M compensated noise-containing speech signals; and a multi-channel signal separator that extracts pure noise components from the M compensated noise-containing speech signals using M adaptive blocking filters that are connected to M adaptive canceling filters in a feedback structure and extracts pure speech components from the added signal using the M adaptive canceling filters that are connected to the M adaptive blocking filters in the feedback structure.
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Citations
30 Claims
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1. An adaptive beamforming method, comprising:
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compensating for time delays of M noise-containing speech signals input via a microphone array having M microphones, wherein M is an integer greater than or equal to 2, and generating a sum signal of the M compensated noise-containing speech signals; and
extracting pure noise components from the M compensated noise-containing speech signals using M adaptive blocking filters that are connected to M adaptive canceling filters in a feedback structure and extracting pure speech components from the sum signal using the M adaptive canceling filters that are connected to the M adaptive blocking filters in the feedback structure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An adaptive beamforming apparatus, comprising:
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a fixed beamformer that compensates for time delays of M noise-containing speech signals input via a microphone array having M microphones, wherein M is an integer greater than or equal to 2, and generates a sum signal of the M compensated noise-containing speech signals; and
a multi-channel signal separator that extracts pure noise components from the M compensated noise-containing speech signals using M adaptive blocking filters that are connected to M adaptive canceling filters in a feedback structure and extracts pure speech components from the sum signal using the M adaptive canceling filters that are connected to the M adaptive blocking filters in the feedback structure. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An adaptive beamforming apparatus, comprising:
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a receiver that receives signals including noise components, delays the received signals by a calculated time to provide delayed received signals, and adds the delayed received signals to provide a combination received signal;
a signal separator that generates a clean signal without noise components based on adaptively filtering the delayed received signals and the combination received signal by a plurality of adaptive blocking filters having blocking coefficients and a plurality of adaptive canceling filters having canceling coefficients connected in a feedback structure, wherein the blocking coefficients and the canceling coefficients are automatically updated during operation of the signal separator. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of removing noise from time delayed signals subject to noise, comprising:
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receiving signals having noise components;
delaying the received signals having the noise components by a predetermined period of time to generate delayed received signals;
adding the delayed received signals to generate a combination received signal;
generating separate clean signals without noise components using adaptive feedback filtering based on the delayed received signals, the combination received signal, and the separate clean signals; and
generating a clean signal without noise components using the separate clean signals. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification