Single-channel speech enhancement algorithm based on compensation phase spectrum

Abstract

The invention provides a single-channel speech enhancement algorithm based on a compensation phase spectrum. The single-channel speech enhancement algorithm comprises the following steps: preprocessing a noisy speech signal, and framing and windowing the noisy speech signal; carrying out fourier transform; dividing a critical frequency band by using an ERB scale; calculating the value of the segmented signal-to-noise ratio; calculating a new compensation factor, and obtaining a primarily enhanced voice complex frequency spectrum through power spectrum subtraction; performing additive calculation on the phase spectrum compensation function and the primarily enhanced voice complex frequency spectrum to obtain a compensated complex frequency spectrum; solving a phase angle of the compensatedcomplex frequency spectrum to obtain a compensated phase spectrum; and overlapping and adding the speech amplitude spectrum after basic spectrum subtraction and the compensation phase spectrum obtained in the seventh step, and then carrying out inverse Fourier transform to obtain an enhanced speech signal. The invention verifies that the improved compensation factor not only has an effect on steady-state noise, but also is more beneficial to the denoising effect of unsteady-state noise, and the speech enhancement algorithm provided by the invention is relatively wide and effective in applicable noise environment.

Description

technical field [0001] The invention relates to the field of speech enhancement algorithms, in particular to a single-channel speech enhancement algorithm based on compensation phase spectrum. Background technique [0002] In the traditional phase spectrum compensation speech enhancement algorithm, assuming that the pure speech s(t) is polluted by the stationary additive Gaussian noise d(t), and the two are independent of each other, the time domain expression of the noisy speech x(t) is: [0003] x(t)=s(t)+d(t) (1); [0004] The expression in the frequency domain obtained by short-time Fourier transform of formula (1) is: [0005] [0006] Among them, n is the number of frames, N represents the length of the discrete Fourier transform, k represents the number of frequency bands, and w(n) is the window function; j is the mathematical symbol in the definition of Fourier transform, which generally does not need to be explained. [0007] In order to facilitate the represen...

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Problems solved by technology

[0024] The technical problem to be solved by the present invention is to provide a single-channel speech enhancement algorithm based on the compensation phase spectrum, and it has been verified that the improved compensation factor is effective, not only for the steady-state noise, but also for the denoising effect of the non-stationary noise It is more advantageous, and at the same time makes up for the defects of the prior art in the denoising of non-stationary noise, so the applicable noise environment of the speech enhancement algorithm of the present invention is relatively extensive and effective

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