时域波形的参数测量实验报告s

时域测试技术综合实验报告书实验名称时域波形的参数测量实验班级一班学号201422070125姓名杨梅实验时间：年月日得分：实验目的1.学习VISUALDSP++开发流程。2.掌握波形时域参数（周期、上升时间等）的测量方法。3.掌握波形幅度参数（幅度、平均值、均方根值等）的测量方法。4.掌握参数统计的一般实现方法。实验内容1.学习VisualDSP++的开发设计流程。2.编写程序测量波形参数。3.编写程序对波形参数进行统计运算。实验步骤1、计算并显示示波器幅度参数：平均值、有效值。打开Ypara.c源文件，填充缺少的代码。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、计算并显示示波器幅度类参数：顶值、底值。打开Ypara.c源文件，填充缺少的代码。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、计算并显示示波器时间类参数：上升时间。打开Xpara.c源文件，填充缺少的代码。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、对代码进行测试（打开参数测量功能），并填写如下表格：输入波形平均值均方根值上升时间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，并将其加入工程中。在Statistic.c文件中对平均值和周期两个参数进行统计运算，并填写如下表格。(1)在Statistic.c文件中的参数统计算法：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;}实验表格输入波形平均值均方根值上升时间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实验思考题1、如何提高波形测量的精度？ 答：主要有两种方法，其一是减少测频量化误差，即增加测量时间（主门时间）的方法；其二是减小侧周量化误差，即采用多周期测量法，在这里不再赘述。此外，为了提高测量的准确度，比较常用的方法还有游标法、内插法、平均测量技术、多周期同步测量法、相检宽带测频技术以及量化时沿法。 完善波形周期、幅度值的测量算法。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