基于ＳｙｓｔｅｍＶｉｅｗ的ＦＩＲ數(shù)字濾波器設(shè)計

摘 要：探討了運(yùn)用SystemView軟件，從圖形化的工具和數(shù)字化的指標(biāo)入手，拋開傳統(tǒng)濾波器設(shè)計中繁瑣的計算與變換，直接快速實現(xiàn)在數(shù)字存儲示波器中，為了消除前端系統(tǒng)本身的噪聲而設(shè)計的FIR數(shù)字濾波器。并且運(yùn)用SystemView軟件的分析工具，對所設(shè)計的FIR數(shù)字濾波器的幅頻特性、相頻特性、阻帶衰減、通帶紋波等性能進(jìn)行了分析。通過分析報表和特性圖形顯示所設(shè)計的FIR數(shù)字濾波器技術(shù)指標(biāo)完全滿足數(shù)字存儲示波器系統(tǒng)的技術(shù)要求。

關(guān)鍵詞：SystemView；數(shù)字濾波器；幅頻特性；相頻特性

Design of FIR Digital Filter Based on SystemView

XIE Limin1，TANG Xia2

(1.Electro-Mechanical Department，Jiangsu United Vocational College，Xuxi，214028，China;2.Wuxi College of Science and Technology，Wuxi，214028，China)

Abstract：This text deals with the application of SystemView software，turning from the sketch of tool and numeral turn of the index sign commence，laying aside the tedious calculation，transformation in the traditional filter design，thus adopting design that SystemView software carries out a directnumerical filterwith ahign speed，which can eliminate noise coming from front end systemindigital storage oscilloscope.And it also applies the analytical tool of SystemView software，while carrying onamplitude-frequency characteristic，to the numerical filter designed，phase-frequency characteristic，bandstop attenuation，as well as the analysis of passband ripple.The technique index of FIR digital filter designed can satisfy technical requirement of digital storage oscilloscope by manifestation of analysing report forms and characteristic sketch.

Keywords：SystemView;digital filter;amplitude-frequency characteristic;phase-frequency characteristic

隨著微電子技術(shù)的迅速發(fā)展，通用數(shù)字信號處理(DSP)芯片的性能不斷提高，具有精度高、靈活性強(qiáng)、可實現(xiàn)多維信號處理等優(yōu)點。數(shù)字信號處理得到越來越廣泛的應(yīng)用，而數(shù)字濾波器作為數(shù)字信號處理的一個重要應(yīng)用方向，在通信系統(tǒng)、數(shù)學(xué)儀器儀表、語音、圖像處理等方面是必不可少的，所以其設(shè)計顯得尤為重要。傳統(tǒng)數(shù)字濾波器的設(shè)計方法一般采用Matlab語言進(jìn)行設(shè)計用DSP實現(xiàn)，但這一傳統(tǒng)的設(shè)計方法需要較長的開發(fā)周期，并且設(shè)計過程反復(fù)進(jìn)行，很不方便。美國Elanix公司推出的SystemView動態(tài)系統(tǒng)仿真軟件，帶有專門的DSP設(shè)計參考和工具，更重要的是利用SystemView的仿真DSP功能，可以對各種數(shù)字濾波器、DSP系統(tǒng)進(jìn)行仿真的設(shè)計。