An Efficient Speech Enhancement Algorithm for Digital Hearing Aids Based on Modified Spectral Subtraction and Companding(Speech and Hearing)

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概要

• 論文の詳細を見る

• Digital hearing aid users often complain of difficulty in understanding speech in the presence of background noise. To improve speech perception in a noisy environment, various speech enhancement algorithms have been applied in digital hearing aids. In this study, a speech enhancement algorithm using modified spectral subtraction and companding is proposed for digital hearing aids. We adjusted the biases of the estimated noise spectrum, based on a subtraction factor, to decrease the residual noise. Companding was applied to the channel of the formant frequency based on the speech presence indicator to enhance the formant. Noise suppression was achieved while retaining weak speech components and avoiding the residual noise phenomena. Objective and subjective evaluation under various environmental conditions confirmed the improvement due to the proposed algorithm. We tested segmental SNR and Log Likelihood Ratio (LLR), which have higher correlation with subjective measures. Segmental SNR has the highest and LLR the lowest correlation of the methods tested. In addition, we confirmed by spectrogram that the proposed method significantly reduced the residual noise and enhanced the formants. A mean opinion score that represented the global perception score was tested; this produced the highest quality speech using the proposed method. The results show that the proposed speech enhancement algorithm is beneficial for hearing aid users in noisy environments.

• 社団法人電子情報通信学会の論文
• 2007-08-01

著者

• Lee Sang

  School of Electronics & Telecommunication Engineering, Korea Aerospace University

• LEE Jong

  Department of Polymer Science and Engineering, Kumoh National Institute of Technology

• KIM In

  Department of Radiation Oncology, Seoul National University College of Medicine

• Kim Sun

  Department Of Chemical Engineering Sogang University

• LEE Young

  Department of Food Science and Nutrition, Pusan National University

• Kim In

  Department Of Animal Resource And Sciences Dankook University

• Hong Sung

  Department Of Otorhinolaryngology And Head & Neck Surgery Sungkyunkwan University School Of Medi

• Hong Sung

  Department Of Otolaryngology-head And Neck Surgery Sungkyunkwan University School Of Medicine

• Ji Yoon

  Department Of Biomedical Engineering Hanyang University

• Lee Young

  Department Of Biomedical Engineering Hanyang University

• Kim In

  Hanyang Univ. Seoul Kor

• CHEE Young

  Department of Biomedical Engineering, Hanyang University

• Lee Young

  Department Of Aerospace Information Engineering The Konkuk University

• Chee Young

  Department Of Biomedical Engineering Hanyang University

• Hong Sung

  Department Of Computer Science And Engineering Pohang University Of Science And Technology

• Lee Sang

  School Of Advanced Material Engineering Kookmin University

• Lee Jong

  Department Of Anesthesiology And Pain Medicine Dong-a University Hospital

• Lee Sang

  School Of Electrical Engineering Inha University

• Kim Sun

  Department Of Applied Chemistry Faculty Of Engineering Osaka University

• Kim Sun

  Department Of Biomedical Engineering Hanyang University

• Hong Sung

  Department Of Architectural Engineering Seoul National University

• Kim Sun

  Department Of Animal Science And Technology Seoul National University

• Lee Jong

  Department Of Biomedical Engineering Hanyang University

• Lee Jong

  Depart. Of Oncology Yonsei Univ. Wonju College Of Medicine

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