(Programming in Lua, 4th Edition)书签版

西门子仿真编程软件S7-PLCSIM V5.4，用于S7-300/400系列PLC程序的仿真(S7-PLCSIM V5.4 offers the following new features with this release: DP, Industrial Ethernet and PC Internal connection types supported in addition to MPI Formerly, S7-PLCSIM used a default connection of MPI, address 2. With S7-PLCSIM V5.4, you can browse STEP 7 projects and select a networked node for establishing a simulation connection. S7-PLCSIM simulates the CPU of the selected node, all nodes that belong to that CPU, and the subnet of the selected node. Increased number of blocks supported for simulation S7-PLCSIM supports a set of OBs, SFBs, and SFCs as described in the electronic manual and online help. Of these, some are NOPs that is, they do not perform any operation. With S7-PLCSIM V5.4, the number of blocks that are not NOPs has increased.)

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.)

介绍如何使用系统自带的API函数访问与操作计算机硬件。(Describes how to use the system s own API function to access and operation of computer hardware.)

该文件为ansys常见错误提示及其解决办法(ANSYS common operation errors and their solutions)

说明：  地球物理学中的C++编程，pdf版本的，经典书籍~(Geophysics in the C++ programming, pdf version of the classic book ~)

python for informatics, 专门介绍如何用python进行数据分析和统计(Introduce how to use Python for data analysis and statistics)

精密放大器英文资料LT1014_DataSheet.pdf(English information LT1014_DataSheet.pdf Precision Amplifier)

stegnography papper pdf document

Optisystem 模拟实例大全，初学应该不错(Optisystem simulate examples, good for new users)

python 书籍 非常经典，希望大家有所收获(python very classic books, I hope you all have a harvest)