The primary work in this dissertation : 1 . based on the analysis of direct digital synthesis ( dds ) , this dissertation compares the differences and similarities between direct digital waveform synthesizer ( ddws ) and direct digital frequency synthesizer ( ddfs ) . a dds system is presented , and the theoretical analysis and practical implementation of the system is discussed in details 本文所作的主要工作如下: 1 .全面分析了直接數字合成( dds )技術的工作原理,對比了直接數字波形合成( ddws )及直接數字頻率合成( ddfs )兩種數字波形產生方法,并就其理論設計和工程實踐問題進行討論。