Speech enhancement method based on feature compensation gain for effective speech recognition in noisy environments

Ara Bae; Wooil Kim

doi:10.7776/ASK.2019.38.1.051

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2019 Vol.38, Issue 1 Preview Page Next Page

Research Article

Speech enhancement method based on feature compensation gain for effective speech recognition in noisy environments 잡음 환경에 효과적인 음성인식을 위한 특징 보상 이득 기반의 음성 향상 기법

31 January 2019. pp. 51-55

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Abstract

This paper proposes a speech enhancement method utilizing the feature compensation gain for robust speech recognition performances in noisy environments. In this paper we propose a speech enhancement method utilizing the feature compensation gain which is obtained from the PCGMM (Parallel Combined Gaussian Mixture Model)-based feature compensation method employing variational model composition. The experimental results show that the proposed method significantly outperforms the conventional front-end algorithms and our previous research over various background noise types and SNR (Signal to Noise Ratio) conditions in mismatched ASR (Automatic Speech Recognition) system condition. The computation complexity is significantly reduced by employing the noise model selection technique with maintaining the speech recognition performance at a similar level.

Keywords

Speech enhancement

Feature compensation gain

Variational model composition

Speech recognition

Noisy environment

본 논문에서는 잡음 환경에 강인한 음성 인식 성능을 위해 특징 보상 이득을 이용한 음성 향상 기법을 제안한다. 본 논문에서는 변분 모델 생성 기법을 채용한 병렬 결합된 가우스 혼합 모델(Parallel Combined Gaussian Mixture Model, PCGMM) 기반의 특징 보상 기법으로부터 계산할 수 있는 특징 보상 이득을 이용하는 음성 향상 기술을 제안한다. 불일치 환경 음성 인식 시스템 적용 환경에서 본 논문에서 제안하는 기법이 실험 결과에서 기존의 전처리 기법 및 이전 연구에서 제안된 특징 보상 기반의 음성 향상 기법에 비해 다양한 잡음 및 SNR(Signal to Noise Ratio) 조건에서 월등한 인식 성능을 나타내는 것을 확인한다. 또한 잡음 모델 선택 기법을 적용함으로써 음성 인식 성능을 유사한 수준으로 유지하면서 계산량을 대폭적으로 감축할 수 있다.

키워드

음성 향상

특징 보상 이득

변분 모델 생성

음성 인식

잡음 환경

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 38
No :1
Pages :51-55
Received Date : 2018-11-09
Accepted Date : 2019-01-25
DOI :https://doi.org/10.7776/ASK.2019.38.1.051

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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