In the fourth chapter, the analyzed testset is improved.The signal processing module, data acquiring module and measurement software of testset are redeveloped.The computer in the testset is updated.

• 第四章对解剖分析的信噪比测试仪进行了改进，重新设计和研制了测试仪的信号处理模块、数据采集模块和测试软件，升级了计算机系统。