信噪失真比 meaning in Chinese

sinad radio

The principles of sigma - delta modulator have been discussed firstly and the influences of structure and parameters on resolution have been analyzed . then on the base of theories , the simulink toolbox of matlab has been used to make behavior simulation and fft analyse of two main structures : 2 - 1 - 1 and 2 - 2 . the related parameters of modulator such as : psd , sndr and enob have been gotten by simulink toolbox on the conditions of different oversampling rates . from the analyses above , topology of modulator has been chosen
调制器的原理进行了介绍,分析了各种结构及参数对调制器精度的影响;其次,在理论指导的基础上,利用matlab的simulink工具包对调制器两种主要级联结构: 2 - 1 - 1和2 - 2结构进行了行为级仿真和fft分析,得出了在不同过采样率条件下,两种结构调制器的功率谱密度、信噪失真比以及有效位数,通过比较确定了调制器的拓扑结构。