voip前景广泛，各位初学者者不妨看看这份教程 ，很有帮助。

Several unique features distinguish the book: * Coding style that shows a clear relationship between VHDL constructs and hardware components * Conceptual diagrams that illustrate the realization of VHDL codes * Emphasis on the code reuse * Practical examples that demonstrate and reinforce design concepts, procedures, and techniques * Two chapters on realizing sequential algorithms in hardware * Two chapters on scalable and parameterized designs and coding * One chapter covering the synchronization and interface between multiple clock domains -Several unique features distinguish the book: * Coding style that shows a clear relationship between VHDL constructs and hardware components * Conceptual diagrams that illustrate the realization of VHDL codes * Emphasis on the code reuse * Practical examples that demonstrate and reinforce design concepts, procedures, and techniques * Two chapters on realizing sequential algorithms in hardware

北京大学数据结构课程讲义，内容很详细，系统的介绍了数据结构方面的知识-The data structure, Peking University lecture courses, the content is very detailed and systematic introduction of the data structure of knowledge

关于DTMF信号的讲解及应用HT9170HT9200对DTMF信号进行解码-DTMF signals on the brief and application HT9170HT9200 right to decode DTMF signals

一本关于java3d的教程 非影印 示例代码丰富-a tutorial for java 3d programming

arm codeblocks 环境搭建 英文版-the environment to build arm codeblocks English

工业上编程经常要用到ModBus 详细了解协议很有必要。-Programming industry to learn more about the regular use to ModBus protocol is necessary.

SERVLET编程，一本很不错的书

una breve explicación sobre el framework java server faces

多传感器数据融合理论与应用 多传感器系统的应用及优势，大气对信号的衰减作用 -Multi-sensor data fusion theory and application of multi-sensor system applications and advantages, the role of atmospheric attenuation of the signal

一本很好的学习Frontpage的书，从入门到精通一应俱全！- A very good study Frontpage book, from crosses the threshold is skilled in has it all!