求翻译：应用MATLAB语言设计数字滤波器时采用直接程序设计法、FDATool以及SPTool信号处理工具箱的设计方法，通过实例，给出了FIR程序设计法和使用信号处理工具箱中SPTool进行设计的仿真图形，并利用MATLAB环境下的仿真软件Simulink对所设计的滤波器进行了模拟仿真。是什么意思？

Application direct programming in Matlab language design digital filters, design method fdatool and sptool Signal Processing Toolbox, an example is given fir programming method and the use of signal processing the toolbox sptool design simulation graphics and The use of simulation software in the Ma

Application MATLAB language designed the digital filter is a direct and design law, FDATool SPTool signal processing methods for the design of the tool box, by way of example, the law and use FIR programming signal processing toolbox SPTool design emulation graphics, and the use of the environment M