摘要
设计分析了Chirp函数在时域和频域内的一般特点和解析公式。提出首先在Altera DSP开发工具DSP Builder中实现直接数字合成器(DDS)模块,根据Chirp函数特定的输入/输出(线性和非线性)关系,计算出当前输入字与输出频率的对应关系;然后设计控制字子模块产生DDS模块的频率控制字,驱动DDS产生不同的输出频率,通过在Matlab的Simu-link环境下的仿真验证,得出不同时刻输出的频谱图,验证了该设计能很好地实现Chirp信号源。
The characters of Chirp function in the time and frequency domained zone are analysed. At first,acheving Digital Direct Synthesizer（DDS） based on Altera＇s DSP developing tool -DSP Builder. Designing the subsystem blocks which count to the DDS＇s controlling words of special output frequency by the input controlling words based on the special in - to - out relationship （linear or non - linear） of chirp function to in order to drive the DDS to get the different output frequency. This design can reach the Chirp signal source through the simulation tool - Simulink of Matlab.
出处
《现代电子技术》
2009年第16期92-94,99,共4页
Modern Electronics Technique
