摘要
采用时域波形分解的方法 ,分析了相位截尾对DDS输出频谱的影响 ,给出了相位截尾误差频谱的分布规律 ,提出一组误差谱的高精度快速算法 ,并对其作了仿真 ,波形数据表地址字长较长时 ,可采用其中的近似算法 ,较短时则可采用精确算法 .
The analysis of DDS output spectrum in presence of phase truncation is made with breaking its waveform in timedomain and a fast arithmetic is presented which makes it easy to compute the error spectrum caused by phase truncation, without approximating the phase truncation, the result is accurate for every kind of address width of LUT(Look Up Table) while the approximate arithmetic is fit for the DDS with the wider address LUT.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
2000年第1期141-145,共5页
Journal of Southeast University：Natural Science Edition
关键词
DDS
相位截尾
误差谱
快速算法
信号分析
DDS
phase accumulator truncation
error spectrum
fast spectrum arithmetic
