| DDS输出频谱特点及改善方法 |
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| 引用本文： | 刘铁新,高俊法.DDS输出频谱特点及改善方法[J].时间频率学报,1999,22(1):1-5. |
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| 作者姓名： | 刘铁新 高俊法 |
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| 作者单位： | 中国科学院陕西天文台 |
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| 摘 要： | 利用非均匀采样模型得到了存在相位截断时直接数字频率合成（ＤＤＳ）的输出频谱，通过分析频谱特点，讨论了改善频谱分布的方法
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| 关 键 词： | 非均匀采样 相位截断 |
The Characteristics of the DDC out Spectrum and Improving Method |
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| Liu Tiexin,Gao Junfa.The Characteristics of the DDC out Spectrum and Improving Method[J].Journal of Time and Frequency,1999,22(1):1-5. |
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| Authors: | Liu Tiexin Gao Junfa |
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| Abstract: | Direct digital synthesis (DDS) technique is a new method to frequency generation,and it has been widely used since it has many advantages. The spurious lines of DDS out spectrum in case of existing the phase truncation are analysed in detail using the digital spectrum analysis technique for a class of nonuniformly sampled signals. A method of adding a sequence of pseudo random numbers to convert the discrete spectrum line into a continuous noise floor is discussed. |
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| Keywords: | Nonuniformly Sampled Phase Accumulator Truncation |
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