非线性动力学方法研究声门下压对离体狗喉声音质量的影响

发布时间：2018-12-17 01:22

【摘要】：目的探讨声门下压(sub-glottal pressure,SGP)变化与离体狗喉声音质量变化之间的关系及非线性动力学和扰动分析方法在区别发声信号中的作用。方法收集6只离体狗喉分别在SGP为2kPa和4kPa时的发声信号,分别采用非线性动力学方法和扰动分析方法进行分析,比较非线性动力学指标:相空间重构、关联维D2及扰动分析方法指标:频率微扰(jitter)、振幅微扰(shimmer)、基频(F0)、噪谐比(NHR)对SGP变化的敏感性。结果在SGP为4kPa时离体狗喉发声信号的相空间重构较SGP为2kPa时复杂,在SGP为4kPa时离体狗喉发声信号的D2和F0较SGP为2kPa时高,差异有统计学意义(P0.05),在SGP为4kPa时离体狗喉发声信号的jitter、shimmer和NHR较SGP为2kPa时低,差异有统计学意义(P0.05);60次声学信号中有21次因不能提取稳定频率无法使用扰动方法进行分析,其中,SGP为4kPa时16次,SGP为2kPa时5次,差异有统计学意义(P0.05)。结论在SGP为4kPa时离体狗喉的声音质量较SGP为2kPa时更好;离体狗喉发声信号的不规则性与SGP大小有关;非线性动力学方法分析声学信号较扰动方法更具敏感性。
[Abstract]:Objective to investigate the relationship between the variation of subglottic pressure (sub-glottal pressure,SGP) and the sound quality of dog larynx in vitro and the role of nonlinear dynamics and perturbation analysis in distinguishing sound signals. Methods the vocal signals of 6 dogs' throats with SGP as 2kPa and 4kPa were collected and analyzed by nonlinear dynamic method and perturbation analysis method respectively. The nonlinear dynamic indexes were compared: phase space reconstruction. Correlation dimension D2 and perturbation analysis index: the sensitivity of frequency perturbation (jitter), amplitude perturbation (shimmer), fundamental frequency (F0), noise harmonic ratio (NHR) to SGP changes. Results when SGP was 4kPa, the phase space reconstruction of vocal signal in isolated dog larynx was more complicated than that when SGP was 2kPa, and the D 2 and F 0 of in vitro voice signal of dog larynx with SGP as 4kPa were significantly higher than those with SGP 2kPa (P0.05). When SGP was 4kPa, the jitter,shimmer and NHR of isolated dog larynx were lower than that of SGP with 2kPa (P0.05). Among the 60 acoustic signals, 21 times could not be analyzed by perturbation method because they could not extract stable frequency. Among them, SGP was 4kPa 16 times, SGP was 2kPa 5 times, the difference was statistically significant (P0.05). Conclusion the sound quality of isolated dog larynx is better when SGP is 4kPa than when SGP is 2kPa, the irregularity of vocal signal in isolated dog larynx is related to the size of SGP, and the nonlinear dynamic method is more sensitive than the perturbation method in analyzing acoustic signal.
【作者单位】： 厦门大学附属中山医院耳鼻咽喉-头颈外科;厦门大学海洋与地球学院;复旦大学附属眼耳鼻喉医院;
【基金】：国家自然科学基金(81371080,NSF11174240) 厦门市科技局社会科技研究面上项目(3502220124035)联合资助
【分类号】：R767

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