Apparatus and method for eliminating noise

摘要

Provided are an apparatus and method for eliminating noise. The method includes: detecting a speech section from a noise speech signal including a noise signal; separating the speech section into a consonant section and a vowel section on the basis of a VOP at the speech section; calculating a transfer function of a filter for eliminating the noise signal to allow the degree of noise elimination to be different in the consonant section and the vowel section; and eliminating the noise signal from the noise speech signal on the basis of the transfer function.

主权项

1. A noise eliminating apparatus comprising:
a speech section detecting unit configured to detect a speech section from a noise speech signal including a noise signal; a speech section separating unit configured to separate the speech section into a consonant section and a vowel section on the basis of a Vowel Onset Point (VOP) in the speech section; a filter transfer function calculating unit configured to calculate a transfer function of a filter for eliminating the noise signal in order to allow the degree of noise elimination in the consonant section and the vowel section to be different, wherein the filter transfer function calculating unit comprises an initial transfer function calculating unit and a final transfer function calculating unit, wherein the initial transfer function calculating unit is configured to calculate an initial transfer function by estimating the priori SNR at a current signal frame when calculating the initial transfer function by using the current signal frame extracted from a noise speech signal, and wherein the final transfer function calculating unit is configured to calculate a final transfer function as a transfer function of the filter by updating a previously-calculated transfer function in consideration of a critical value according to whether a corresponding signal frame corresponds to which one of the consonant section, the vowel section, and a non-speech section, when calculating the final transfer function by using at least one signal frame after the current signal frame; and a noise eliminating unit configured to eliminate the noise signal from the noise speech signal on the basis of the transfer function.