• Title, Summary, Keyword: Speech Enhancement

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Performance Comparison of the Speech Enhancement Methods for Noisy Speech Recognition (잡음음성인식을 위한 음성개선 방식들의 성능 비교)

  • Chung, Yong-Joo
    • Phonetics and Speech Sciences
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    • v.1 no.2
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    • pp.9-14
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    • 2009
  • Speech enhancement methods can be generally classified into a few categories and they have been usually compared with each other in terms of speech quality. For the successful use of speech enhancement methods in speech recognition systems, performance comparisons in terms of speech recognition accuracy are necessary. In this paper, we compared the speech recognition performance of some of the representative speech enhancement algorithms which are popularly cited in the literature and used widely. We also compared the performance of speech enhancement methods with other noise robust speech recognition methods like PMC to verify the usefulness of speech enhancement approaches in noise robust speech recognition systems.

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Classical Tamil Speech Enhancement with Modified Threshold Function using Wavelets

  • Indra., J;Kasthuri., N;Navaneetha Krishnan., S
    • Journal of Electrical Engineering and Technology
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    • v.11 no.6
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    • pp.1793-1801
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    • 2016
  • Speech enhancement is a challenging problem due to the diversity of noise sources and their effects in different applications. The goal of speech enhancement is to improve the quality and intelligibility of speech by reducing noise. Many research works in speech enhancement have been accomplished in English and other European Languages. There has been limited or no such works or efforts in the past in the context of Tamil speech enhancement in the literature. The aim of the proposed method is to reduce the background noise present in the Tamil speech signal by using wavelets. New modified thresholding function is introduced. The proposed method is evaluated on several speakers and under various noise conditions including White Gaussian noise, Babble noise and Car noise. The Signal to Noise Ratio (SNR), Mean Square Error (MSE) and Mean Opinion Score (MOS) results show that the proposed thresholding function improves the speech enhancement compared to the conventional hard and soft thresholding methods.

Microphone Array Based Speech Enhancement Using Independent Vector Analysis (마이크로폰 배열에서 독립벡터분석 기법을 이용한 잡음음성의 음질 개선)

  • Wang, Xingyang;Quan, Xingri;Bae, Keunsung
    • Phonetics and Speech Sciences
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    • v.4 no.4
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    • pp.87-92
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    • 2012
  • Speech enhancement aims to improve speech quality by removing background noise from noisy speech. Independent vector analysis is a type of frequency-domain independent component analysis method that is known to be free from the frequency bin permutation problem in the process of blind source separation from multi-channel inputs. This paper proposed a new method of microphone array based speech enhancement that combines independent vector analysis and beamforming techniques. Independent vector analysis is used to separate speech and noise components from multi-channel noisy speech, and delay-sum beamforming is used to determine the enhanced speech among the separated signals. To verify the effectiveness of the proposed method, experiments for computer simulated multi-channel noisy speech with various signal-to-noise ratios were carried out, and both PESQ and output signal-to-noise ratio were obtained as objective speech quality measures. Experimental results have shown that the proposed method is superior to the conventional microphone array based noise removal approach like GSC beamforming in the speech enhancement.

Adaptive Noise Canceller for Speech Enhancement Using 2-D Binary Mask (2차원 이진 마스크를 이용한 적응형 음성향상 잡음 제거기)

  • Lee, Gihyoun;Lee, Jyung Hyun;Cho, Jin-Ho;Kim, Myoung Nam
    • Journal of Korea Multimedia Society
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    • v.19 no.7
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    • pp.1127-1136
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    • 2016
  • Speech enhancement algorithm plays an important role in numerous speech signal processing applications. Over the last few decades, many algorithms have been studied for speech enhancement. The algorithms are based on spectral subtraction, Wiener filter, and subspace method etc. They have good performance of speech enhancement, but the performance can be deteriorated in specific noises or low SNR environment. In this paper, a new speech enhancement algorithms are proposed based on adaptive noise canceller. And the proposed algorithm improved performance of adaptive noise cancelling using 2-D binary mask. From objective experimental index, it is confirmed that the proposed algorithm is useful and has better performance than recently proposed speech enhancement algorithms.

Speech Recognition in Noise Environment by Independent Component Analysis and Spectral Enhancement (독립 성분 분석과 스펙트럼 향상에 의한 잡음 환경에서의 음성인식)

  • Choi Seung-Ho
    • MALSORI
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    • no.48
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    • pp.81-91
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    • 2003
  • In this paper, we propose a speech recognition method based on independent component analysis (ICA) and spectral enhancement techniques. While ICA tris to separate speech signal from noisy speech using multiple channels, some noise remains by its algorithmic limitations. Spectral enhancement techniques can compensate for lack of ICA's signal separation ability. From the speech recognition experiments with instantaneous and convolved mixing environments, we show that the proposed approach gives much improved recognition accuracies than conventional methods.

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The Effect of the Speech Enhancement Algorithm for Sensorineural Hearing Impaired Listeners

  • Kim, Dong-Wook;Lee, Young-Woo;Lee, Jong-Shill;Chee, Young-Joon;Lee, Sang-Min;Kim, In-Young;Kim, Sun-I.
    • Journal of Biomedical Engineering Research
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    • v.28 no.6
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    • pp.732-743
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    • 2007
  • Background noise is one of the major complaints of not only hearing impaired persons but also normal listeners. This paper describes the results of two experiments in which speech recognition performance was determined for listeners with normal hearing and sensorineural hearing loss in noise environment. First, we compared speech enhancement algorithms by evaluation speech recognition ability in various speech-to-noise ratios and types of noise. Next, speech enhancement algorithms by reducing background noise were presented and evaluated to improve speech intelligibility for sensorineural hearing impairment listeners. We tested three noise reduction methods using single-microphone, such as spectrum subtraction and companding, Wiener filter method, and maximum likelihood envelop estimation. Their responses in background noise were investigated and compared with those by the speech enhancement algorithm that presented in this paper. The methods improved speech recognition test score for the sensorineural hearing impaired listeners, but not for normal listeners. The results suggest the speech enhancement algorithm with the loudness compression can improve speech intelligibility for listeners with sensorineural hearing loss.

1 Channel Speech Enhancement using ROEX Auditory Filter (ROEX 청각 필터를 이용한 단일채널 Speech Enhancement)

  • 김학윤
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.31-34
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    • 1998
  • 배경 잡음에 의해 저하된 음성을 복원하는 기술은 이미 오래 전부터 여러 가지 기법들이 연구되어왔다. 이들 기법 중, Spectral Subtraction 기법은 단일 채널에 의한 Speech Enhancement의 대표적인 방법이다. 그러나, 기존의 단일 채널 Speech Enhancement 기법의 중요한 단점은 Musical Noise라 불리는 잔존 Noise의 발생 및 목적신호가 왜곡된다는 것이다. 이 잔존 Noise에 의해 지금까지 연구 보고된 단일 채널 Speech Enhancement기법들은 거의 대부분 SNR은 향상되었지만 명료도의 향상이 곤란하였다고 보고되어왔다. 그러므로, 본 연구에서는 인간의 청각기구의 지각과정을 충실히 모방한 ROEX(Rounded Exponential) 청각 Filter를 이용하여 잔존 Noise인 Musical Noise를 억제시키는 기법을 제안하고자 한다.

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Speech Recognition through Speech Enhancement (음질 개선을 통한 음성의 인식)

  • Cho, Jun-Hee;Lee, Kee-Seong
    • Proceedings of the KIEE Conference
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    • pp.511-514
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    • 2003
  • The human being uses speech signals to exchange information. When background noise is present, speech recognizers experience performance degradations. Speech recognition through speech enhancement in the noisy environment was studied. Histogram method as a reliable noise estimation approach for spectral subtraction was introduced using MFCC method. The experiment results show the effectiveness of the proposed algorithm.

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IMM Algorithm with NPHMM for Speech Enhancement (음성 향상을 위한 NPHMM을 갖는 IMM 알고리즘)

  • Lee, Ki-Yong
    • Speech Sciences
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    • v.11 no.4
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    • pp.53-66
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    • 2004
  • The nonlinear speech enhancement method with interactive parallel-extended Kalman filter is applied to speech contaminated by additive white noise. To represent the nonlinear and nonstationary nature of speech. we assume that speech is the output of a nonlinear prediction HMM (NPHMM) combining both neural network and HMM. The NPHMM is a nonlinear autoregressive process whose time-varying parameters are controlled by a hidden Markov chain. The simulation results shows that the proposed method offers better performance gains relative to the previous results [6] with slightly increased complexity.

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A Robust Speech Recognition Method Combining the Model Compensation Method with the Speech Enhancement Algorithm (음질향상 기법과 모델보상 방식을 결합한 강인한 음성인식 방식)

  • Kim, Hee-Keun;Chung, Yong-Joo;Bae, Keun-Seung
    • Speech Sciences
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    • v.14 no.2
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    • pp.115-126
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    • 2007
  • There have been many research efforts to improve the performance of the speech recognizer in noisy conditions. Among them, the model compensation method and the speech enhancement approach have been used widely. In this paper, we propose to combine the two different approaches to further enhance the recognition rates in the noisy speech recognition. For the speech enhancement, the minimum mean square error-short time spectral amplitude (MMSE-STSA) has been adopted and the parallel model combination (PMC) and Jacobian adaptation (JA) have been used as the model compensation approaches. From the experimental results, we could find that the hybrid approach that applies the model compensation methods to the enhanced speech produce better results than just using only one of the two approaches.

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