지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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Companding algorithms have been used to enhance speech recognition in noise for cochlea implant users.
The efficiency of using companding for digital hearing aid users is not yet validated. The purpose of this study is to evaluate the performance of the companding for digital hearing aid users in the various hearing loss cases. Using HeLPS, a hearing loss simulator, two different sensorinerual hearing loss conditions were simulated; mild gently sloping hearing loss(HL1) and moderate to steeply sloping hearing loss(HL2). In addition, a non-linear compression was simulated to compensate for hearing loss using national acoustic laboratories-non-linear version 1(NAL-NL1) in HeLPS. In companding, the following four different companding strategies were used changing Q values(q1, q2) of pre-filter(F filter) and post filter(G filter). Firstly, five IEEE sentences which were presented with speech-shaped noise at different SNRs(0, 5, 10, 15 dB) were processed by the companding. Secondly, the processed signals were applied to HeLPS. For comparison, signals which were not processed by companding were also applied to HeLPS.
For the processed signals, log-likelihood ratio(LLR) and cepstral distance(CEP) were measured for evaluation of speech quality. Also, fourteen normal hearing listeners performed speech reception threshold(SRT) test for evaluation of speech intelligibility. As a result of this study, the processed signals with the companding and NAL-NL1have performed better than that with only NAL-NL1 in the sensorineural hearing loss conditions. Moreover, the higher ratio of Q values showed better scores in LLR and CEP. In the SRT test, the processed signals with companding(SRT = −13.33 dB SPL) showed significantly better speech perception in noise than those processed using only NAL-NL1(SRT = −11.56 dB SPL).
목차
등록된 정보가 없습니다.
참고문헌 (25)
참고문헌 신청
A. Bhattacharya / 2007 / Companding to improve cochlear-implant speech recognition in speech-shaped noise / The Journal of the Acoustical Society of America 122 : 1079 ~
A. Simpson / 1990 / Spectral enhancement to improve the intelligibility of speech in noise for hearing-impaired listeners / Acta oto-laryngologica. Supplementum 469 : 101 ~
A.M. Kondoz / 2004 / Digital speech: coding for low bit rate communication systems / John Wiley & Sons Inc : 65 ~ 67
B.A.M. Franck / 1999 / Evaluation of spectral enhancement in hearing aids, combined with phonemic compression / The Journal of the Acoustical Society of America 106 : 1452 ~
D. Byrne / 1994 / An international comparison of long-term average speech spectra / Journal of the Acoustical Society of America 96 : 2108 ~ 2120
A. Simpson / 1990 / Spectral enhancement to improve the intelligibility of speech in noise for hearing-impaired listeners / Acta oto-laryngologica. Supplementum 469 : 101 ~
A.M. Kondoz / 2004 / Digital speech: coding for low bit rate communication systems / John Wiley & Sons Inc : 65 ~ 67
B.A.M. Franck / 1999 / Evaluation of spectral enhancement in hearing aids, combined with phonemic compression / The Journal of the Acoustical Society of America 106 : 1452 ~
D. Byrne / 1994 / An international comparison of long-term average speech spectra / Journal of the Acoustical Society of America 96 : 2108 ~ 2120
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