Speech enhancement method of multi-sub-band spectral subtraction based on phase adjustment and amplitude compensation

A technology of amplitude compensation and phase adjustment, applied in the field of speech enhancement of multi-subband spectral subtraction, can solve problems such as difficult to establish, and achieve the effect of suppressing music noise, eliminating isolated peaks, and overcoming the influence of cross terms

Active Publication Date: 2013-04-03
INST OF AUTOMATION CHINESE ACAD OF SCI
View PDF2 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the implementation of speech enhancement algorithm, the length of each frame is only about 20-30ms. In such a short time, this rule is difficult to establish (Reference 2: N.Evans, J.Mason, W.Liu, and B .Fauve, "An assessment on the fundamental limitations of spectral subtraction". Proc. IEEE Internat. Conf. on Acoustics, Speech, Signal Processing (ICASSP), 2006)
Therefore, the formula for spectral subtraction is only an approximation rather than an exact

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Speech enhancement method of multi-sub-band spectral subtraction based on phase adjustment and amplitude compensation
  • Speech enhancement method of multi-sub-band spectral subtraction based on phase adjustment and amplitude compensation
  • Speech enhancement method of multi-sub-band spectral subtraction based on phase adjustment and amplitude compensation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0023] Such as figure 1 As shown, the present invention discloses a speech enhancement method based on multi-subband spectral subtraction of phase adjustment and amplitude compensation, the method comprising the following steps:

[0024] Step 101: Collect a noisy speech signal y(k) through a microphone. The following is a detailed description of step 101 .

[0025] Suppose the noisy speech signal y(k) collected by the microphone at time k is the sum of x(k) and v(k), that is

[0026] y(k)=g*s(k)+v(k)=x(k)+v(k) (1)

[0027] Among them, g is the impulse response of the sound source s(k) to the microphone, x(k) is the pure speech collected by the microphone, and v(k) is the additive noise.

[0028] Step 102 truncates the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a speech enhancement method of a multi-sub-band spectral subtraction based on phase adjustment and amplitude compensation. The method mainly includes truncating signals acquired by a microphone and performing fast Fourier transform (FFT); performing micro maximum search on an amplitude spectrum through a phase adjustment algorithm to obtain an adjusted amplitude spectrum of noisy speech; estimating the amplitude spectrum of noise; dividing a whole band into a plurality of sub-bands and calculating the signal to noise ratio of each sub-band; performing amplitude spectrum subtraction of an over-subtraction rule on each sub-band; performing amplitude compensation on speech spectrums after the spectrum subtraction; and obtaining time domain waveforms of the signals through fast Fourier inversion and signal overlapping.

Description

technical field [0001] The invention relates to the field of speech signal processing, in particular to a speech enhancement method based on multi-subband spectral subtraction of phase adjustment and amplitude compensation. Background technique [0002] Spectral subtraction is the earliest speech enhancement algorithm proposed for noise removal in history (Reference 1: S.F.Boll, "Suppression of the acoustic noise in speech using spectral subtraction", IEEE Tran.Acoust.Speech Signal Process.27(2 ), 113-120, 1979), is also one of the most widely used algorithms. It is based on a basic theory: for additive noise, we can obtain an estimate of the speech spectrum by subtracting the noise spectrum from the Discrete Fourier Transform (DFT) spectrum of the noisy speech. The noise spectrum can be estimated and updated by silent segments. The time-domain waveform of the enhanced speech can be obtained by performing an inverse discrete Fourier transform (Inverse Discrete Fourier Tran...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0232
Inventor 刘文举李超
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap