This design construct an sinusoidal signalgenerator based on DDS(Direct Digital Frequency Synthesis), completed by MCU AT89S52 and necessary analog circuit.
The software is composed of two parts: the communication programming of 3350 main board and the analog code pro? gramming of the signalgenerator.
软件包括两部分：与外部系统 3350主板之间的通信编程和信号发生器本身的模拟编码发送编程。
3
In this paper a new type of PAL and NTSC color bar signalgenerator is described, which consists of a few digital integrated circuits and two analog integrated circuits.