matlab中dspbuilder的经典教程，利用直接数字合成DDS为实例，介绍dspbuilder的用法-matlab in dspbuilder classic handbook, the use of direct digital synthesis DDS as an example to introduce the usage of dspbuilder

利用Matlab软件编程实现DDS（直接数字频率合成技术）。-Using Matlab software programming to achieve DDS (direct digital frequency synthesis technology).