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Enhanced blind source separation algorithm for highly correlated mixtures

A blind source separation and correlation technology, applied in the field of processing technology combined with blind source separation technology, can solve problems such as performance degradation

Inactive Publication Date: 2010-12-01
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it may not be possible to determine which of the two output signals is the desired speech signal and which is the ambient noise after signal separation
This inherent uncertainty of the BSS algorithm causes significant performance degradation

Method used

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  • Enhanced blind source separation algorithm for highly correlated mixtures
  • Enhanced blind source separation algorithm for highly correlated mixtures
  • Enhanced blind source separation algorithm for highly correlated mixtures

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Embodiment Construction

[0049] In the following description, specific details are given to provide a thorough understanding of the configurations. It will be understood, however, by those skilled in the art that the described configurations may be practiced without these specific details. For example, circuits may be shown in block diagrams in order not to obscure the configuration in unnecessary detail. In other instances, well-known circuits, structures and techniques have been shown in detail in order not to obscure the described configurations.

[0050] Also note that the configuration may be described as a process depicted as a flowchart, flow diagram, structure diagram or block diagram. Although a flowchart may describe operations as a sequential process, many of the operations may be performed in parallel or simultaneously. Additionally, the order of operations may be rearranged. A process terminates when its operations are complete. A procedure may correspond to a method, function, proced...

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Abstract

An enhanced blind source separation technique is provided to improve separation of highly correlated signal mixtures. A beamforming algorithm is used to precondition correlated first and second input signals in order to avoid indeterminacy problems typically associated with blind source separation. The beamforming algorithm may apply spatial filters to the first signal and second signal in order to amplify signals from a first direction while attenuating signals from other directions. Such directionality may serve to amplify a desired speech signal in the first signal and attenuate the desired speech signal from the second signal. Blind source separation is then performed on the beamformer output signals to separate the desired speech signal and the ambient noise and reconstruct an estimate of the desired speech signal. To enhance the operation of the beamformer and / or blind source separation, calibration may be performed at one or more stages.

Description

technical field [0001] At least one aspect relates to signal processing, and more particularly to processing techniques used in conjunction with blind source separation (BSS) techniques. Background technique [0002] Some mobile communication devices may employ multiple microphones in an effort to improve the quality of sound and / or audio signals captured from one or more signal sources. These audio signals are often corrupted by background noise, disturbances, interference, crosstalk, and other unwanted signals. Accordingly, such communication devices typically use advanced signal processing methods to process audio signals captured by multiple microphones in order to enhance the desired audio signal. This process, often referred to as signal enhancement, provides improved sound / speech quality, reduced background noise, etc. in the desired audio signal, while suppressing other irrelevant signals. In voice communications, the desired signal is usually a voice signal and si...

Claims

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Application Information

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IPC IPC(8): H04R3/00H04R25/00G10L21/02
CPCH04R3/005G10L21/028H04R25/40G10L2021/02166H04R3/00G10L21/02
Inventor 王松迪尼希·拉马克里希南萨米尔·库马尔·古普塔埃迪·L·T·乔伊
Owner QUALCOMM INC
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