DDS

压电智能悬臂梁振动主动控制的研究 压电智能悬臂梁振动主动控制的研究 (Piezoelectric active vibration control of smart cantilever beam study of piezoelectric active vibration control of smart cantilever beam research)

non local means denoising

说明：  主成分分析和独立成分分析,分别处理降维问题和盲信号分离问题(Principal component analysis and independent component analysis, dimensionality reduction, respectively, deal with the problems and blind signal separation)

本代码基于dwt的音频水印技术，在音频中加入高斯随机水印，达到防伪的效果。(The code is based on dwt audio watermarking technology in audio watermarking by adding Gaussian random to achieve security results.)

This source code is about the ant colony optimization.How ants are getting food the nest to food source with shortest path route.

电压用极坐标形式表示的牛顿拉夫逊法电力系统潮流计算(Newton Raphson power flow calculation of power grid)

这是一个用来计算2维光子带的matlab程序。可分别计算TM 和TE模式平面波入射下的场分布。(This is a program to calculate the Photonic Bands of two dimension。The field excited by TM and TE mode plane wave incident can be calculated.)

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(Cochlear substantially equivalent to a filter set, cochlear filter is used 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 )

QUAD tree compression technique

Solution of the orbit equation: Theta as function of time t. Numerical solution of Kepler’s equation for the elliptical test problem Matlab code