subband_adpcm

Steepest Descent Algorithm

根据多行三列的实验数据（x,y,signal)作出contourf图。其中x,y为二位空间位置（或其他概念的二维），signal为在该位置的信号。此代码先将数据按位置不同求平均，再将signal按照其对应的x,y分配到二位矩阵内。最后作图。编这个代码的初衷是为了制作大脑hippocampus区域place cell 活动性的contour 图。(it s a code i made for plotting a contour graph of experimental data (x,y,signal). The data should be n*3 arrays which cannot be plot into contour directly. In fact, it can subplot 6*6 graphs or more, but speed might be slow..... especially, when you want more detailed graphs.)

an example for kalman filter is brought here.

三相pwm逆变并网仿真模型，相关研究的人可作参考(Three-phase pwm inverter grid simulation model can be used for studies of human reference)

基于Hilbert-Huang变换的语音信号共振峰频率估计，一种对语音信号的分析方法(Based on the Hilbert Huang transform of speech signal formant frequency estimation, a method on the analysis of the speech signal)

三相静止坐标到两相静止坐标的转换模型 三相静止坐标abc到两相旋转坐标dq的转换模型(Three-phase stationary coordinate abc three-phase stationary coordinate transformation model to the two-phase stationary coordinate transformation model to the two-phase rotating coordinate dq)

无速度传感器的异步电机矢量控制书籍对学习电机的控制有很大的帮助(Speed ​ ​ sensorless induction motor vector control books of great help to learning motor control)

frequency hop spread spectrum technology for secure data tranfer

高炜炳老师1996年写的变结构控制的经典书籍，有助于学习变结构相关的内容(sliding model control of nonlinear system control)

用动态独立分量进行闪变检测，用于电能质量闪变检测仿真，构造和分解闪变信号频谱图(With dynamic independent component to flicker, flicker detection for power quality simulation, construction and decomposition of flicker spectrum )