Enhancement of electrolaryngeal speech by adaptive filtering
Enhancement of electrolaryngeal speech by adaptive filtering
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DOI：
10.1044/jslhr.4106.1253
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发表时间：
1998-12-01
影响因子：
2.6
通讯作者：
Walsh, MJ
中科院分区：
文献类型：
--
作者：
Espy-Wilson, CY;Chari, VR;Walsh, MJ
人造喉为那些失去或无法使用喉的人提供了一种语言交流的手段。虽然它们能够实现充分的交流，但所产生的语音具有不自然的质量，并且比正常语音明显更难理解。广泛使用的经皮人工喉（TAL）的主要问题之一是存在由TAL、其与颈部的界面以及周围颈部组织的声能泄漏引起的稳定背景噪声。问题的严重程度因说话者而异，部分取决于个人颈部组织的特征。本研究测试的假设，TAI语音增强的质量（通过评估听众的偏好判断）和清晰度去除固有的，直接辐射的背景信号。特别是，重点是通过电话或其他电子通信媒介改善语音。设计并实现了一种新的自适应滤波器结构来滤除背景噪声。知觉测试进行评估的语音，从两个人与喉切除术和两个正常的扬声器使用服务器TAL，处理前后的自适应滤波器的自适应滤波TAL语音的频谱分析显示，背景源辐射量显着减少，但保留了声音输出的声学特性。感知测试的结果表明，对处理后的语音有明显的偏好。总体而言，清晰度没有显著改善或下降。然而，加工确实提高了词首非鼻音辅音的可懂度。
Artificial larynges provide a means of verbal communication for people who have either lost or are otherwise unable to use their larynges. Although they enable adequate communication, the resulting speech has an unnatural quality and is significantly less intelligible than normal speech. One of the major problems with the widely used Transcutaneous Artificial larynx (TAL) is the presence of a steady background noise caused by the leakage of acoustic energy from the TAL, its interface with the neck, and the surrounding neck tissue. The severity of the problem varies from speaker to speaker, partly depending upon the characteristics of the individual's neck tissue. The present study tests the hypothesis that TAI speech is enhanced in quality (as assessed through listener preference judgments) and intelligibility by removal of the inherent, directly radiated background signal. In particular, the focus is on the improvement of speech over the telephone or through some other electronic communication medium. A novel adaptive Filtering architecture was designed and implemented to remove the background noise. Perceptual tests were conducted to assess speech, from two individuals with a laryngectomy and two normal speakers using the Server TAL, before and after processing by the adaptive filter A spectral analysis of the adaptively Filtered TAL speech revealed a significant reduction in the amount of background source radiation yet preserved the acoustic characteristics of the vocal output. Results from the perceptual tests indicate a clear preference For the processed speech. In general, there was no significant improvement or degradation in intelligibility. However, the processing did improve the intelligibility of word-initial non-nasal consonants.