基于小波变换的语音信号基音频率检测法

将基于小波变换与多分辨分析 (MRA)下的Mallat算法与传统的快速傅立叶变换(FFT)相结合 ,提出了一种新的语音信号的基音频率检测方法。实验结果表明 ,这种方法能有效地抑制语音信号中共振峰对基音频率的影响 ,且不必考虑语音信号的短时性。与传统基音估计方法比较 ,此方法具有运算速度快、基音估计准确度高的特点。  

基于Daubechies小波的基音检测

语音中的基音成分是进行语音分析的重要参数，利用Daubechies小波在语音信号的低频分解方面的良好性质，提出了Daubechies小波分解的基音检测方法，该方法具有抗噪声性能良好、低频近似程度高等特点。  

Conformal analysis of fundamental frequency of vibration of simple-supported elastic ellipse-plates with concentrated substance

Aimed at calculating the fundamental frequency of vibration of special-shaped, simple-supported elastic plates, Conformal Mapping theory is applied, and the mathematical method of trigonometric interpolation with interpolation points mutual iterative between odd and even sequences in boundary region is provided, as well as the conformal mapping function which can be described by real number region between complicated region and unit dish region is carried out. Furthermore, in the in-plane state of constant stress, vibrating function is completed by unit dish region method for simple-supported elastic plates with concentrated substance of complicated vibrating region, and the coefficient of fundamental frequency of the plate is analyzed. Meanwhile, taking simple-supported elastic ellipseplates as an example, the effects on fundamental frequency caused by eccentric ratio, the coefficient of constant inplane stress, as well as the concentrated substance mass and positions are analyzed respectively.  

隐马氏链模型识别汉语四声声调

本文提出一种用隐马氏链模型识别汉语声调的新方案。由每一种声调的训练语音求出相应的概率模型参数作为识别模板。识别时,分别用每一种声调的模型参数计算出现输入语声周期序列的概率,概率最大者即为输入语声的声调模型。实验语音选用的是“小学汉语拼音教学录音磁带”,一个男声和一个女声,对于其中的24个韵母和21组拼音音节,正确识别率为98%。  

Mapping analysis of vibrating fundamental frequency for simple-supported elastic rectangle-plates with concentrated mass

By conformal mapping theory, a trigonometric interpolation method between odd and even sequences in rectangle boundary region was provided, and the conformal mapping function of rectangle-plate with arc radius between complicated region and unite dish region was carried out. Aiming at calculating the vibrating fundamental frequency of special-shaped, elastic simple-supported rectangle-plates, in the in-plane state of constant stress, the vibration function of this complicated plate was depicted by unit dish region. The coefficient of fundamental frequency was calculated. Whilst, taking simple-supported elastic rectangle-plates with arc radius as an example, the effects on fundamental frequency caused by the concentrated mass and position, the ratio of the length to width of rectangle, as well as the coefficient of constant in-plane stress were analyzed respectively.  

Conformal analysis of fundamental frequency of vibration of simple-supported elastic ellipse-plates with concentrated substance

Aimed at calculating the fundamental frequency of vibration of special-shaped, simple-supported elasticplates, Conformal Mapping theory is applied, and the mathematical method of trigonometric interpolation with interpolation points mutual iterative between odd and even sequences in boundary region is provided, as well as the conformal mapping function which can be described by real number region between complicated region and unit dish region is carried out. Furthermore, in the in-plane state of constant stress, vibrating function is completed by unit dish region method for simple-supported elastic plates with concentrated substance of complicated vibrating region, and the coefficient of fundamental frequency of the plate is analyzed. Meanwhile, taking simple-supported elastic ellipseplates as an example, the effects on fundamental frequency caused by eccentric ratio, the coefficient of constant inplane stress, as well as the concentrated substance mass and positions are analyzed respectively.  

边界条件对单层球面网壳结构性能的影响

本文应用ALGORFEAS(Windows版 )计算程序 ,计算分析了不同边界条件下对单层球面网壳内力、位移和自振特性的影响 ,为网壳结构支座设计提供了理论依据。  

用修正的Dunkerley公式计算结构的基频

用修正的Dunkerley公式计算了二振系的基频,结果表明,用修正的Dunkerley公式计算结构基频,基精度明显高于Dunkerley公式.  

估算多自由度振动系统基频的新方法

本文提出多自由度振动系统固有频率的一种近似解法。应用此法估算基频，在假设振型非常粗糙的情况下，仍能有较高的精度，同时亦能出精确值的范围。  

语音识别技术研究

介绍一种实时语音识别系统，对语音识别系统的硬件组成及软件技术进行了论述，所开发的系统具有较高的识别精度，有较为广阔的应用前景。