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There are three kinds of switching mode DC-DC converters, buck, boost and buck-boost. The buck mode is used to reduce output voltage, whilst the boost mode can increase the output voltage. In the buck-boost mode, the output voltage can be maintained either higher or lower than the source but in the opposite polarity.

无线通信简易链路 包含调制解调 信号检测(wireless communication simple links including module , demodule and signal detection)

用于地球物理中重力和磁力位场边界提取的几个常用的算法，包含数据处理，建模，和滤波。(Gravity and Magnetic Data Mapping, Processing, Modeling and Filtering Software.)

介绍了自适应均衡方面的一些文章和代码，可供有需要的同志参考实用。(Describes some aspects of adaptive equalization articles and code, there is a need for practical reference comrades.)

说明：  数值分析方法-数据拟合-多项式数据拟合的实现(Numerical analysis method- data fit- polynomial data fitting to achieve)

讲述了现在机械故障诊断中用到的常用时频分析方法，如短时fft 魏格纳维尔分布 小波变换 HHT等，里面含有例子和详细说明，对初学者帮助很大。(Tells the now commonly used in mechanical fault diagnosis frequency analysis methods, such as short-time wavelet transform fft Wigner distribution HHT Louisville, etc., which contains examples and detailed instructions, very helpful for beginners.)

用matlab处理语音信号分帧，加窗的程序(Speech signal sub-frame window)

说明：  it is an rar file containing codes of matlab an info related to matlab

描述了LTE下行物理信道的信道编码的详细实现，包括CRC校验、turbo编码、咬尾卷积编码和速率匹配等。(Describes LTE downlink physical channel channel coding detailed implementation, including the CRC check, turbo encoding, tail-biting convolutional coding and rate matching.)

This program calculates return on investments and overall viability of a construction project over a range of initial plot sizes. It models cash flows using rudimentary construction costs, sales revenues and mortgage repayments.