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PID学习的好资料，功能详尽，值得大家去好好学习研究(PID learning good information, features detailed study worth to learn)

读入一段语音，进行基音检测，最后实现对这段语音的共振峰检测。(Read in a speech, pitch detection, and finally to achieve this period of speech resonance peak detection.)

对于QPSK性能分析的源码,最后给除2种信道下的误码率比较图(QPSK performance analysis for the source, the final addition to the two types of channel bit error rate plan)

Geometrical nonlinear finite element solver

扩展卡尔曼滤波（EKF）用于匀速运动目标（CV模型）的目标跟踪算法实例(Target tracking with EKF in CV model)

说明：  现代信号处理中对基本的ESPRIT的一种改进算法的程序，并利用算法进行了信号频率的统计仿真实验！(Modern signal processing of basic ESPRIT An Improved Algorithm for the procedures and the use of algorithms of statistical signal frequency simulation!)

Microstrip is a type of electrical transmission line which can be fabricated using printed circuit board technology, and is used to convey microwave-frequency signals. It consists of a conducting strip separated from a ground plane by a dielectric layer known as the substrate. Microwave components such as antennas, couplers, filters, power dividers etc. can be formed from microstrip, the entire device existing as the pattern of metallization on the substrate. Microstrip is thus much less expensive than traditional waveguide technology, as well as being far lighter and more compact. Microstrip was developed by ITT laboratories as a competitor to stripline (first published by Grieg and Engelmann in the December 1952 IRE proceedings).

三电平仿真模型，相对两电平谐波更小，极有参考价值(Tri-level simulation model of two level harmonic smaller, relatively great reference value)

粒子群算法，也称粒子群优化算法（Particle Swarm Optimization），缩写为 PSO， 是近年来发展起来的一种新的进化算法(Evolutionary Algorithm - EA)。(For each particle ____Initialize particle END Do ____For each particle ________Calculate fitness value ________If the fitness value is better than the best fitness value (pBest) in history ____________set current value as the new pBest ____End ____Choose the particle with the best fitness value of all the particles as the gBest ____For each particle ________Calculate particle velocity according equation (a) ________Update particle position according equation (b) ____End)

this is the noise reduction source code. i hope this will be useful for every body who used it