关于P2P端对端技术的实现-原理篇,P2P ，IM，即时通讯-About P2P-end technology to achieve- the principle articles, P2P, IM, instant messaging

MSP430G2553系列单片机。采用DDS原理来实现信号的产生，使用PWM波模拟DAC，外围使用一些基本的滤波和放大电路，实现了可产生正弦波、三角波、锯齿波的简易信号发生器。-MSP430G2553 series mcu. Principle of the use of DDS to achieve signal generation, the use of PWM wave simulation DAC, peripheral using some basic filtering and a

基于DDS原理的频率信号产生方法正弦信号余弦信号-Based on the principle of DDS frequency signal generating method sinusoidal signal cosine signal