求翻译：本报告主要介绍了用QuartusⅡ设计完成直接数字频率合成器dds的过程，该频率合成器输出的频率及相位均可控制，且能输出正弦，余弦，方波，三角波，锯齿波等五种波形，并可在示波器上切换显示，在控制电路下实现清零，保持功能，同时能在显示管上显示输出频率、频率控制字及相位控制字。设计完后下载到Smartspoc实验系统中进行硬件测试。是什么意思？

This report describes the design with the Quartus Ⅱ complete dds direct digital frequency synthesizer in the process, the frequency synthesizer output frequency and phase can be controlled, and can output sine, cosine, square wave, triangle wave, sawtooth wave and other five, and switch on the oscil

This report highlights the design is completed with QuartusII dds direct digital frequency synthesizers, the process of the Frequency synthesiser output frequency and phase can be controlled, and is able to output Sine, cosine, square wave, sawtooth wave 3 point 5, such as an oscilloscope, waveform,

This report mainly introduced uses QuartusⅡThe design completes direct numeral frequency synthesizer dds the process, this frequency synthesizer outputs the frequency and the phase may control, also can output the si

This report main describes has with Quartus ⅱ design completed directly digital frequency synthesis device DDS of process, the frequency synthesis device output of frequency and the phase are may control, and can output sine, cosine, square wave, triangle wave, anti-aliasing wave, five species wavef