時(shí)域測試技術(shù)綜合實(shí)驗(yàn)報(bào)告書實(shí)驗(yàn)名稱時(shí)域波形的參數(shù)測量實(shí)驗(yàn)班級一班學(xué)號201422070125姓名楊梅實(shí)驗(yàn)時(shí)間：年月日得分：實(shí)驗(yàn)?zāi)康?.學(xué)習(xí)VISUALDSP++開發(fā)流程。2.掌握波形時(shí)域參數(shù)（周期、上升時(shí)間等）的測量方法。3.掌握波形幅度參數(shù)（幅度、平均值、均方根值等）的測量方法。4.掌握參數(shù)統(tǒng)計(jì)的一般實(shí)現(xiàn)方法。實(shí)驗(yàn)內(nèi)容1.學(xué)習(xí)VisualDSP++的開發(fā)設(shè)計(jì)流程。2.編寫程序測量波形參數(shù)。3.編寫程序?qū)Σㄐ螀?shù)進(jìn)行統(tǒng)計(jì)運(yùn)算。實(shí)驗(yàn)步驟1、計(jì)算并顯示示波器幅度參數(shù)：平均值、有效值。打開Ypara.c源文件，填充缺少的代碼。intGetAverage(short*pBuffer,intLength){ intSum=0; inti; for(i=0;i<Length;/*inputyourcode*/i++){Sum+=*pBuffer;/*inputyourcode*/pBuffer++;}returnSum/Length;/*inputyourcode*/}floatGetRMS(short*pBuffer,intLength,intZeroValue){ floatSum=0; inti; for(i=0;i<Length;i++){ longtemp; temp=pBuffer[i]-ZeroValue;/*inputyourcode*/ temp*=temp;/*inputyourcode*/ Sum+=temp; }Sum/=Length;returnsqrt(Sum)+ZeroValue; /*inputyourcode*/}2、計(jì)算并顯示示波器幅度類參數(shù)：頂值、底值。打開Ypara.c源文件，填充缺少的代碼。intGetTop(short*pBuffer,intLength){ shortmidpoint,toppoint,i; midpoint=GetAverage(pBuffer,Length); toppoint=GetMax(); i=toppoint; GetCount(*pBuffer,Length); do { i--; if(tmpbuffer[i]>tmpbuffer[toppoint]) toppoint=i; }while(i>midpoint); //修正 if(tmpbuffer[toppoint]<Length*0.05) toppoint=GetMax(); returntoppoint;/*inputyourcode*/ //return1;}intGetBase(short*pBuffer,intLength){ shortmidpoint,basepoint,i; midpoint=GetAverage(pBuffer,Length); basepoint=GetMin(); i=basepoint; GetCount(*pBuffer,Length); do { i++; if(tmpbuffer[i]>tmpbuffer[basepoint]) basepoint=i; }while(i<midpoint); //修正 if(tmpbuffer[basepoint]<Length*0.05) basepoint=GetMin(); returnbasepoint; /*inputyourcode*/ //return1;}3、計(jì)算并顯示示波器時(shí)間類參數(shù)：上升時(shí)間。打開Xpara.c源文件，填充缺少的代碼。intGetRising(short*pBuffer,intLength,intyPer10,intyPer90,int*pxPer10,int*pxPer90){ intIndex=0; while(Index<Length&&pBuffer[Index]>yPer10/*inputyourcode*/) Index++; while(Index<Length&&pBuffer[Index]<=yPer10/*inputyourcode*/) Index++; intxPer10=0; if(Index<Length) xPer10=Index; while(Index<Length&&pBuffer[Index]<yPer90/*inputyourcode*/) Index++; intxPer90=0; if(Index<Length) xPer90=Index; *pxPer90=xPer90; *pxPer10=xPer10; return1;}3、對代碼進(jìn)行測試（打開參數(shù)測量功能），并填寫如下表格：輸入波形平均值均方根值上升時(shí)間1KHz正弦波（偏移1V，幅度600mV）1.1v1.64v142us1KHz方波（偏移100mV，幅度600mV）82mv680mv18us1KHz三角波（偏移0V，幅度1.2V）12mv1.22v284us4、新建文件Statistic.c和Statistic.h，并將其加入工程中。在Statistic.c文件中對平均值和周期兩個(gè)參數(shù)進(jìn)行統(tǒng)計(jì)運(yùn)算，并填寫如下表格。(1)在Statistic.c文件中的參數(shù)統(tǒng)計(jì)算法：intGetAverage(short*pBuffer,intLength){ intSum=0; inti; for(i=0;i<Length;/*inputyourcode*/i++){Sum+=*pBuffer;/*inputyourcode*/pBuffer++;}returnSum/Length;/*inputyourcode*/}intGetPeriod(short*pBuffer,intLength,intyPer10,intyPer90,int*pxFirst,int*pxLast){intFirstR10,FirstR90,FirstMid; GetRising(pBuffer,Length,yPer10,yPer90,&FirstR10,&FirstR90); FirstMid=(FirstR10+FirstR90)/2; intFirstF10,FirstF90,SecondMid; GetFalling(pBuffer,Length,yPer10,yPer90,&FirstF10,&FirstF90); SecondMid=(FirstF10+FirstF90)/2; intThird10,Third90,ThirdMid; if(FirstMid>SecondMid) { GetFalling(pBuffer+FirstR90,Length-FirstR90,yPer10,yPer90,&Third10,&Third90); *pxFirst=SecondMid; ThirdMid=(Third10+Third90)/2+FirstR90; } else { GetRising(pBuffer+FirstF10,Length-FirstF10,yPer10,yPer90,&Third10,&Third90); *pxFirst=FirstMid; ThirdMid=(Third10+Third90)/2+FirstF10; } *pxLast=ThirdMid; return1; /*inputyourcode*/ *pxFirst=50; *pxLast=100; return1;}實(shí)驗(yàn)表格輸入波形平均值均方根值上升時(shí)間1KHz正弦波（偏移1V，幅度600mV）1.1v1.64v142us1KHz方波（偏移100mV，幅度600mV）82mv680mv18us1KHz三角波（偏移0V，幅度1.2V）12mv1.22v284us實(shí)驗(yàn)思考題1、如何提高波形測量的精度？ 答：主要有兩種方法，其一是減少測頻量化誤差，即增加測量時(shí)間（主門時(shí)間）的方法；其二是減小側(cè)周量化誤差，即采用多周期測量法，在這里不再贅述。此外，為了提高測量的準(zhǔn)確度，比較常用的方法還有游標(biāo)法、內(nèi)插法、平均測量技術(shù)、多周期同步測量法、相檢寬帶測頻技術(shù)以及量化時(shí)沿法。 完善波形周期、幅度值的測量算法。答：intGetPeriod(short*pBuffer,intLength,intyPer10,intyPer90,int*pxFirst,int*pxLast){intFirstR10,FirstR90,FirstMid; GetRising(pBuffer,Length,yPer10,yPer90,&FirstR10,&FirstR90); FirstMid=(FirstR10+FirstR90)/2; intFirstF10,FirstF90,SecondMid; GetFalling(pBuffer,Length,yPer10,yPer90,&FirstF10,&FirstF90); SecondMid=(FirstF10+FirstF90)/2; intThird10,Third90,ThirdMid; if(FirstMid>SecondMid) { GetFalling(pBuffer+FirstR90,Length-FirstR90,yPer10,yPer90,&Third10,&Third90); *pxFirst=SecondMid; ThirdMid=(Third10+Third90)/2+FirstR90; } else { GetRising(pBuffer+FirstF10,Length-FirstF10,yPer10,yPer90,&Third10,&Third90); *pxFirst=FirstMid; ThirdMid=(Third10+Third90)/2+FirstF10; } *pxLast=ThirdMid; return1; /*inputyourcode*/ *pxFirst=50; *pxLast=100; return1;}intGetAmplitude(sho