摘要
采用数字合成技术产生的正弦波存在波形失真，其失真度大小既与正弦函数一个周期内的转换点数Ｎ有关，也与Ｄ／Ａ转换器的字长Ｄ有关。利用傅立叶级数，本文分析了数字合成正弦波失真度与转换点数Ｎ，Ｄ／Ａ转换器字长Ｄ的数学关系，并对改进型方案的有关结论给予了补充说明。
Harmonic distortion exists in sinusoidal wave generated by digital synthesis technique with its value is related to not only the number of converting points in a period but also the word length of the D/A converter. By means of Fourier series, the relations among the value of total harmonic distortion (THD), the number of converting points and the word length of the D/A converter are analyzed in the paper. Moreover, some conclusions of advanced scheme are also illustrated.
出处
《数据采集与处理》
EI
CSCD
1998年第4期324-329,共6页
Journal of Data Acquisition and Processing
基金
国家教委博士点基金
关键词
数字技术
量化失真
数字合成
失真度
电气测量
digital techniques
quantizing distortion
digital synthesis
total harmonic distortion
converting point
