piano_notes_research

说明：  线性调频信号的产生，用MATLAB实现，脉宽25，扫描带宽20MHZ，取样频率20MHZ，时频积为50，并给出其频率特性(LFM signal produce)

本程序为扩展卡尔曼滤波(ekf)的程序代码，可以供初学者学习。(This procedure is extended Kalman filter (ekf) code, for beginners to learn.)

科斯塔斯环提取8PSK调制载波，出载波频率图、眼图、相位偏差等(The Costas loop extracts 8PSK modulated carrier, out of carrier frequency diagram, eye diagram, phase deviation and so on.)

单端反激式开关电源设计的matlab源码(Design Code of the Single-end Reverced Exciting Switching Power Source implemented by MATLAB.)

has the code to build a blackmanns window function

3 fisrt parts are: Download the file Square.tif and answer the following questions: i. Smooth the image with a 3 􀵈 3 spatial filter. ii. Smooth the image with an implementation of Gaussian filter in frequency domain. Change the bandwidth of the filter and show how these changes affect the result.

对图片做二维dct变换，每一小块为8*8(Do the 2-D DCT transform , every piece of 8*8)

说明：  最小均方濾波器是一類可通過最小化誤差訊號之均方值而修正濾波器係數，以類比所需理想濾波器的自適應濾波器，其中作為修正依據的誤差訊號為理想參考訊號與實際輸出訊號之差。該種濾波器所用之最小均方法只以當前之訊號誤差值為準進行修正，是一種隨機梯度下降法。最小均方法係由斯坦福大學的Bernard Widrow教授及他的首位博士班學生Marcian Hoff於1960年提出。最小均方濾波器屬於常見的自適應濾波器種類之一。(The minimum mean square filter is an adaptive filter that can correct the filter coefficients by minimizing the mean square value of the error signal to analogize the desired ideal filter. The error signal used as the correction reference is the ideal reference signal and the actual output. The difference between the signals. The minimum averaging method used in this kind of filter is only corrected based on the current signal error value, which is a stochastic gradient descent method. The minimum mean method was proposed in 1960 by Professor Bernard Widrow of Stanford University and his first PhD student, Marcian Hoff. The least mean square filter is one of the common types of adaptive filters.)

说明：  利用潮位数据计算理论深度基准面，其中各分潮系数需修改(Calculating theoretical depth datum using tidal data)

Implement two methods face recognition: PCA and LDA for ORL face base