采用扩展型双线性变换进行病理嗓音共振峰修正  

Pathological Voice Formant Correction by Extended Bilinear Transformation

作　　者：周婉艺 徐天琪[1] 周佳秦 张晓俊[1] 陶智[1] 孙宝印[1] ZHOU Wanyi;XU Tianqi;ZHOU Jiaqin;ZHANG Xiaojun;TAO Zhi;SUN Baoyin(College of Physics and Optoelectronics and Energy,Soochow University,Suzhou Jiangsu 215006,China)

机构地区：[1]苏州大学物理与光电能源学部,江苏苏州215006

出　　处：《电子器件》2018年第2期507-511,共5页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(61271359);江苏省高等学校大学生创新创业训练计划项目(201610285015)

摘　　要：针对甲亢和声带小结等病理嗓音在修复时与正常嗓音存在共振峰偏离的问题,提出采用扩展型双线性变换(EBT)的共振峰修正方法。对提取出的病理嗓音共振峰先采用线谱对分段定值偏移法进行一次修正,引入双线性变换对频率进行弯折,接着采用二级弯折因子对频谱偏移做进一步优化,实现对病理嗓音共振峰的二次修正。实验表明,本文算法对病理嗓音第一、第二共振峰修正效果显著,尤其是针对定值偏移法难以修正的甲亢和声带小结两种病理嗓音,KL距离值分别提高了84%和63%。Aiming at the problem that the pathological voice of hyperthyroidism and vocal nodules are deviated from the normal voice during the repair,a method of formant correction using extended bilinear transformation(EBT)is proposed.First of all,use the line spectrum of the segmented fixed value of the offset to a correction,and then use the bilinear transform to bend the frequency.And the secondary bending factor was further improved to achieve the quadratic correction of the pathological vocal resonance peak.The experimental results show that the proposed algorithm is more effective than the other methods in correcting the first and second formants of pathological voice,especially for the fixed value offset method which is difficult to amend the hyperthyroidism and vocal nodules two pathological voice.KL distance was increased by 84%and 63%,respectively.

关 键 词：病理嗓音 共振峰 线谱对 分段定值偏移 双线性变换 

分 类 号：R312[医药卫生—基础医学]