DCDC_halfbridge_PWM

本文通过对男性和女性声音的语音特征的研究，发现男女声的基音频率存在较大的差异，并设计了基于基音频率分析的男女声识别系统。男女声识别系统由以下三个模块电路构成：话筒放大器，低通滤波器，半波整流电路，单片机测量控制模块。话筒放大器采用NE5532P音前置芯片，对语音信号进行放大；八阶低通滤波器MAX293完成基音信号的提取；单片机STC12C5410AD实现频率测量和控制输出功能。经仿真与电路实测，男女声的识别效果良好。(In this paper, the voices of male and female voice characteristics of the findings of a study of the fundamental frequency of the sound of men and women there is a big difference, and the design of frequency analysis based on the pitch of the voice recognition system for men and women. Voice Recognition System for men and women from the circuit the following three modules: the microphone amplifier, low-pass filter, half-wave rectifier circuit, single-chip measurement control module. NE5532P sound using the microphone pre-amplifier chip amplification of voice signals eight MAX293-order low-pass filter to complete the extraction of pitch signal STC12C5410AD single-chip realization of the frequency of measurement and control output. By circuit simulation and measurement, the identification of male and female voices well.)

华为h.248协议介绍-Huawei H.248 protocol introduction

欧洲高速列车车轮标准踏面S1002数据生成及分析(highspeed wheel tread analysis)

本程序采用牛顿拉夫逊进行电力网络的潮流分布计算，是电力系统教学的工具之一。-This procedure using the Newton Raphson power networks, the trend of distributed computing, power systems are one of the tools of teaching.

IEEE 118 bus system case. Simulation on ATP

说明：  将txt文本内的所有字符（UTF-8编码）提取出来并去重，并保存提取结果。(All characters in the TXT text (UTF-8 encoding) are extracted and duplicated, and the extraction results are saved.)

The Self taught Programmer The Definitive Guide to Programming Professionally

这上我们初三物理复习题，有需要用的同学可以参考(This is our third title Physical Review, have need of the students can refer to)

永磁直流电机 永磁直流电机-Permanent Magnet DC Motor Permanent Magnet DC Motor Permanent Magnet DC Motor

signaux and systems french ppt(signaux and systems)