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Systems, methods, apparatus, and computer-readable media for dereverberation of multichannel signal

A multi-channel, signal technology, applied in the field of signal processing, which can solve problems such as being difficult to understand, causing problems, and low-pitched reverberation.

Inactive Publication Date: 2012-08-01
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Reverberant speech often sounds muffled, less clear, and / or less intelligible than speech heard in a face-to-face conversation (eg, due to destructive interference of signal instances on various acoustic paths)
These effects can be particularly problematic for automatic speech recognition (ASR) applications (e.g., automated business transactions such as account balance or stock quote checking; automated menu navigation; automated query processing), which results in reduced accuracy

Method used

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  • Systems, methods, apparatus, and computer-readable media for dereverberation of multichannel signal
  • Systems, methods, apparatus, and computer-readable media for dereverberation of multichannel signal
  • Systems, methods, apparatus, and computer-readable media for dereverberation of multichannel signal

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Embodiment Construction

[0036] The present invention includes descriptions of systems, methods, apparatus, and computer-readable media for de-echoing multi-microphone signals using beamforming in combination with an inverse filter that uses blind source separation (BSS) The obtained isolated reverberation estimation terms are trained.

[0037] Unless expressly limited by its context, the term "signal" is used herein to denote any of its ordinary meanings, including a memory location (or collection of memory locations) as expressed on a wire, bus, or other transmission medium. state. Unless expressly limited by its context, the term "generate" is used herein to indicate any of its ordinary meanings, eg, computational or otherwise. Unless expressly limited by its context, the term "calculate" is used herein to indicate any of its ordinary meanings, eg, calculating, evaluating, estimating, and / or selecting from a plurality of values. Unless expressly limited by its context, the term "obtain" is used t...

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Abstract

Systems, methods, apparatus, and computer-readable media for dereverberation of a multimicrophone signal combine use of a directionally selective processing operation (e.g., beamforming) with an inverse filter trained on a separated reverberation estimate that is obtained using a decorrelation operation (e.g., a blind source separation operation).

Description

[0001] Claim of priority under 35 U.S.C. §119 [0002] The title of this patent application claimed on September 7, 2009 and assigned to the assignee is "System, Method, Apparatus, and Computer-Readable Medium for Echo Cancellation of Multi-Channel Signals (SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR DEREVERBERATION OF MULTICHANNEL SIGNAL)" Provisional Application No. 61 / 240,301. technical field [0003] The present invention relates to signal processing. Background technique [0004] Reverberation occurs when an acoustic signal originating in a particular direction (eg, a voice signal emitted by a user of the communication device) is reflected off walls and / or other surfaces. In addition to the direct path signal, the signal recorded by the microphone may also contain those multiple reflections (eg delayed instances of the audio signal). Reverberant speech often sounds muffled, less clear, and / or less intelligible than speech heard in a face-to-face conv...

Claims

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Application Information

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IPC IPC(8): G10L21/02
CPCG10L2021/02082Y02B60/50G10L2021/02166G10L21/0216H04R3/005G10L21/0272H04R1/406H04R2499/11H04R2499/15H04R1/10H04R2430/21G10L21/02
Inventor 埃里克·维瑟
Owner QUALCOMM INC
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