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Fractional Fourier transform based evidence-obtaining voice enhancing method of two-dimensional Wiener filtering

A fractional Fourier transform and speech enhancement technology, which is applied in speech analysis, instruments, etc., can solve problems such as not being able to effectively reduce the impact of non-stationary noise

Inactive Publication Date: 2012-04-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the usual speech enhancement algorithms are based on the theory of stationary random noise, which cannot effectively reduce the influence of non-stationary noise. The rotation characteristics of the fractional Fourier transform show that by selecting an appropriate fractional factor a, the fractional Fourier transform domain can be Realize the maximum separation of speech and noise, and can also further separate and eliminate noise through multiple rotations

Method used

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  • Fractional Fourier transform based evidence-obtaining voice enhancing method of two-dimensional Wiener filtering
  • Fractional Fourier transform based evidence-obtaining voice enhancing method of two-dimensional Wiener filtering
  • Fractional Fourier transform based evidence-obtaining voice enhancing method of two-dimensional Wiener filtering

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Embodiment Construction

[0067] The present invention is based on the forensic voice enhancement method of the two-dimensional Wiener filter of fractional Fourier transform, such as figure 1 As shown, it includes the following steps:

[0068] (1) Fractional Fourier transform domain;

[0069] The input speech sequence accounts for a of s(n) i The order fractional Fourier transform algorithm is as follows:

[0070] S a i ( u ) = F a i ( s ( n ) )

[0071] = 1 - j cot a ...

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Abstract

The invention discloses a fractional Fourier transform based evidence-obtaining voice enhancing method of two-dimensional Wiener filtering. The method comprises the following steps of: (1) taking a fractional Fourier transform domain; (2) taking a die; (3) adding a two-dimensional Hamming window; (4) performing the two-dimensional Wiener filtering; (5) performing the fractional Fourier transform;and (6) performing linear combination. The invention has higher application value and wide application prospect in the evidence-obtaining voice enhancement field.

Description

technical field [0001] The invention relates to a speech enhancement method, in particular to a forensic speech enhancement method based on fractional Fourier transform two-dimensional Wiener filtering. Background technique [0002] Audio forensics refers to the acquisition, analysis and evaluation of recording signals as evidence recognized by courts or other administrative departments. Audio evidence may be used as part of a civil or criminal enforcement investigation, administrative investigation, or other civil matter. Audio forensics technology combines many technologies in the field of audio digital signal processing, such as speech recognition, speaker recognition and speech enhancement. Since the 1960s, especially after the Watergate incident in 1974, audio forensics technology has been applied in court forensics. It was once at a standstill. In recent years, with the increasing maturity of voice signal processing technology and the continuous high-tech of criminal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02G10L21/0308
Inventor 包永强邹采荣赵力奚吉王开魏昕唐加能
Owner SOUTHEAST UNIV