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Noise variance estimator for speech enhancement

一种语音、方差的技术，应用在语音分析、语音识别、仪器等方向，能够解决影响估计结果可靠性、不能应用只具有有限的可用存储器、妨碍更新噪声方差估值等问题

Active Publication Date: 2010-02-10
DOLBY LAB LICENSING CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

First, it is difficult to obtain reliable VAD results when the audio signal is noisy, which in turn affects the reliability of the noise variance estimation results
Second, this approach prevents the possibility to update the noise variance estimate when a speech signal is present
[0020] However, the minimum statistical method has high memory requirements and thus cannot be applied to devices with limited available memory

Method used

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  • Noise variance estimator for speech enhancement
  • Noise variance estimator for speech enhancement
  • Noise variance estimator for speech enhancement

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Embodiment approach

[0154]The invention can be implemented in hardware or software or a combination thereof (eg, a programmable logic array). Unless otherwise stated, the processes included as part of the present invention are not inherently related to any particular computer or other device. In particular, various general-purpose machines may be used with programs written in accordance with the teachings herein, or it may be more convenient to construct more specialized apparatus (eg, integrated circuits) to perform the required method steps. Accordingly, the present invention can be implemented as one or more computer programs executing on one or more programmable computer systems, each programmable computer system including at least one processor, at least one data storage system (including volatile and non-volatile memory and / or storage unit), at least one input device or port, and at least one output device or port. Program code is applied to input data to perform the functions described he...

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Abstract

A speech enhancement method operative for devices having limited available memory is described. The method is appropriate for very noisy environments and is capable of estimating the relative strengths of speech and noise components during both the presence as well as the absence of speech.

Description

technical field [0001] The present invention relates to audio signal processing. More specifically, the present invention relates to speech enhancement and clarification in noisy environments. [0002] reference binding [0003] Each of the following references is hereby incorporated by reference in its entirety: [0004] [1] Y.Ephraim and D.Malah, "Speech enhancement using a minimum square error short time spectral amplitude estimator," IEEE Trans.Acoust., Speech, Signal Processing, vol.32, pp.1109-1121, Dec.1984. [0005] [2] N.Virag, "Single channel speech enhancement based on masking properties of the human auditory system," IEEE Tran.Speech and Audio Processing, vol.7, pp.126-137, Mar.1999. [0006] [3] R.Martin, "Spectral subtraction based on minimum statistics," in Proc.EUSIPCO, 1994, pp.1182-1185. [0007] [4] P.J.Wolfe and S.J.Godsill, "Efficient alternatives to Ephraim and Malah suppression rule for audio signal enhancement," EURASIP Journal on Applied Signal Pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L11/00G10L25/93
CPCG10L21/0208G10L25/18G10L15/12G10L15/20
Inventor 俞容山
Owner DOLBY LAB LICENSING CORP
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