feiemom

implement fourier transform by matlab

通过多元统计的办法对采用的几何最小二乘拟合的结果进行分析(Multivariate statistical approach by using the geometry of least squares fitting analysis of the results)

耳蜗实质上相当于一个滤波器组，耳蜗的滤波作用是在对数频率尺度上进行的，在1000HZ下，人耳的感知能力与频率成线性关系；而在1000HZ以上，人耳的感知能力与频率不构成线性关系，而更偏向于对数关系，这就使得人耳对低频信号比高频信号更敏感。Mel频率的提出是为了方便人耳对不同频率语音的感知特性的研究。频率与Mel频率的转换公式为(on logarithm frequency scale, under the 1000 hz, the perception of the human ear and a linear relationship with frequency In more than 1000 hz, the perception of the human ear does not constitute a linear relationship with frequency, and prefer to logarithmic relationship, which makes the human ear is sensitive to low frequency signal is better than high frequency signal. Mel frequency is put forward in order to facilitate the ear of the study of speech perception characteristics of different frequency. For frequency and Mel frequency conversion formula )

获取FFT处理后信号的能量，通过matlab编程实现。(FFT signal processing to obtain energy through matlab programming.)

matlab写的清华校歌，非常好玩，写的人真是人才啊(Matlab written by Qinghua school song, very fun person to write really talent)

说明：  数值计算课后答案的解析，很有用的而且对上机超值(Numerical Analysis of after-school answer, very useful but on the machine value)

Some features and classification function

控制系统中，系统建模。关于状态空间模型建立，然后通过零极点配置控制程序(Control systems, system modeling. On the state space model, and then zero-pole placement control program)

优化算法，寻找全局最优解，放入matlab预设目录直接可以使用(optimization algorithm)

matlab编程，解决非线性最小二乘优化问题，数学建模适用(matlab program to solve nonlinear least squares optimization problems, mathematical modeling applied)