摘要
简介直接数字频率合成器的原理 ,提出在自行设计 DDS时采用波形存储表幅度值压缩方法以降低输出频谱的杂散。文中阐述正弦相位差法、Nicholas优化结构等幅度值压缩方法的有关原理和具体实现方法 ,并提出一种在现有方法上进一步提高压缩比的改进办法 ,最后 ,给出在 Matlab中
The mechanism of the Direct Digital Frequency Synthesizer (DDS)is introduced in this paper,then the method of waveform ROM compression is proposed to suppress the clutter of output spectrum. Some currenely used methods of waveform ROM compressiom are described and compared.Then,a modified method of waveform ROM suppress is presented which is easy to implement and can be used to improve the compression ratio. Finally, a MATLAB simulation result is described?
出处
《遥测遥控》
2004年第2期55-59,共5页
Journal of Telemetry,Tracking and Command
