RC低通滤波器参数计算，可以方便地计算时间常数，衰减倍数等。

PIC16F877单片机使用外部中断最简单的演示程序，适合PIC单片机初学者使用。-PIC16F877 MCU external interrupt most simple demonstration program, suitable for PIC microcontrollers for beginners to use.

Linux环境进程间通信,详细阐述Linux环境进程间通信-Linux environment for inter-process communications, the environment in detail the process of communication between Linux

内置 ；支持MP3、AAC 、AAC+、WAV等格式的音频文件，不能播放320 Kbps的MP3文件，最高只能支持224Kbps，支持新建播放列表和自动重复播放不具备均衡器调节，支持低音增强模式，并且具备7个低音增强级别供用户选择，让用户在欣赏不同风格歌曲时选择合适的低音级别供用户选择，让用户在欣赏不同风格歌曲时选择合适的低音级别，支持环绕立体声（SRS） -built; MP3, AAC, AAC, WAV format audio files, 320 Kbps not play MP3 files, can only support a maximum 224Kbps, the new playlist support and automatic repeat players do not have EQ adjustment, bass enhancement-mode support, and with seven bass enhancement levels for users to select, to allow users to enjoy the songs of different styles to choose a suitable level of bass for users to select, to allow users to enjoy the songs of different styles to choose a suitable bass-level support surround sound (SRS)

AT命令集，GPRS模块开发必备，包含2个pdf，一中文，一英文，可互相对照阅读-AT command set, GPRS module development necessary, including the two pdf, one Chinese, one English, can be read against each other

华为软件编程规范培训实例与练习．写很好直的学习-Huawei software programming training examples and practice norms. Learning to write a good straight

合作通信中放大前传模式下中继多跳的仿真程序-Cooperative communications mode to enlarge prequel multihop relay the simulation program

turbo code encoder decoder communicacion

设置端口名，波特率，打开端口，就可以发送数据，同时可以收到数据，还可以选择发送的方式，比如，可以以十六进制方式发送，在DATA中会显示数据部分，即是除去帧头和校验位之后的数据部分，

使用ntp（network time protocol）协议从网络时间服务器获取时间并显示出来-use the network time protocol get network time from some ntp server,and print

专业的串口程序开发包（非源码），非常方便-professional procedures Serial Development Kit (FOSS), a very convenient