正弦波数据表

#正弦波数据表| 来源: 网络整理| 查看: 265

要生成正弦波，主要就是通过sin()函数用角度计算出每个点的值就行，下面看一下C代码的实现

#define PointMax 64 #define PI 3.1415926 unsigned int sinData[PointMax] = {0}; //point 一个周期内采样的点数 //生成一个周期正弦波水平线为32 最大值为64 最小值为0 void get_sin_tab( unsigned int point ) { unsigned int i = 0, j = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; hd = PI / j; for( i = 0; i < point; i++ ) { fz = j * sin( hd * i ) + j; tem = ( unsigned int )fz; sinData[i] = tem; printf("%d，",tem); } printf("\r\n"); } int main() { get_sin_tab(64); system("pause"); return 0; }

打印的数据如下：

32，35，38，41，44，47，49，52，54，56，58，60，61，62，63，63，64，63，63，62， 61，60，58，56，54，52，49，47，44，41，38，35，32，28，25，22，19，16，14，11， 9，7，5，3，2，1，0，0，0，0，0，1，2，3，5，7，9，11，14，16，19，22，25，28

生成的正弦波图形如下：

这种方法将点数的个数作为最大值，比如生成64个点，那么最大值就是64，如果生成128个点，最大值就是128.

下面再看一种可以设置点数和最大值的方法

int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = k * sin( hd * i ) + k; //i=0时sin(0)=0 起始点为最大值一半，也就是起始点是水平线位置弧度值为π/2内每个点对应的弧度值 tem = ( unsigned int )(fz * 1.0); //通过系数可以调整输出有效值大小 sinData[i] = tem; printf("%d\r\n",tem); } } int main() { get_sin_tab1(64,800); system("pause"); return 0; }

生成点如下：

400,439,478,516,553,588,622,653,682,709,732,752,769,782,792,798,800,798,792,782, 769,752,732,709,682,653,622,588,553,516,478,439,400,360,321,283,246,211,177,146, 117,90,67,47,30,17,7,1,0,1,7,17,30,47,67,90,117,146,177,211,246,283,321,360

生成图形如下

生成64个点，最大值为800.

下面改变一下波形的起始相位。

//point 一个周期内的点数 // 0为最小值 maxnum为最大值 void get_sin_tab1( unsigned int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = k * sin( hd * (i + 180) ) + k; //i=0时起点值为0 tem = ( unsigned int )(fz * 1.0); //通过系数可以调整输出有效值大小 sinData[i] = tem; printf("%d,",tem); } printf("\r\n"); }

生成数据如下：

30,47,67,90,117,146,177,211,246,283,321,360,400,439,478,516,553,588,622,653,682, 709,732,752,769,782,792,798,800,798,792,782,769,752,732,709,682,653,622,588,553, 516,478,439,400,360,321,283,246,211,177,146,117,90,67,47,30,17,7,1,0,1,7,17

波形为

继续改动一下计算公式

//point 一个周期内的点数 // 0为最小值 maxnum为最大值 void get_sin_tab1( unsigned int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = k * sin( hd * (i + 270) ) + k; //i=0时起点值最大 tem = ( unsigned int )(fz * 1.0); //通过系数可以调整输出有效值大小 sinData[i] = tem; printf("%d,",tem); } printf("\r\n"); }

数据：

792,798,800,798,792,782,769,752,732,709,682,653,622,588,553,516,478,439,400,360, 321,283,246,211,177,146,117,90,67,47,30,17,7,1,0,1,7,17,30,47,67,90,117,146,177, 211,246,283,321,360,399,439,478,516,553,588,622,653,682,709,732,752,769,782,

波形：

void get_sin_tab1( unsigned int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = maxnum * sin( hd /2 * i ); //i=0时 sin(0)=0 起始点为0 也就是起点值为最小值弧度值为π内每个点对应的弧度值 tem = ( unsigned int )(fz * 1.0); //通过系数可以调整输出有效值大小 sinData[i] = tem; printf("%d,",tem); } printf("\r\n"); }

数据

0,39,78,117,156,194,232,269,306,342,377,411,444,476,507,537,565,592,618,642,665, 686,705,723,739,753,765,776,784,791,796,799,800,799,796,791,784,776,765,753,739, 723,705,686,665,642,618,592,565,537,507,476,444,411,377,342,306,269,232,194,156, 117,78,39,

波形：

继续调整一下算法

void get_sin_tab1( unsigned int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = maxnum - maxnum * sin( hd /2 * i ); tem = ( unsigned int )(fz * 1.0); //通过系数可以调整输出有效值大小 sinData[i] = tem; printf("%d,",tem); } printf("\r\n"); }

生成数据

800,760,721,682,643,605,567,530,493,457,422,388,355,323,292,262,234,207,181,157, 134,113,94,76,60,46,34,23,15,8,3,0,0,0,3,8,15,23,34,46,60,76,94,113,134,157,181, 207,234,262,292,323,355,388,422,457,493,530,567,605,643,682,721,760

生成图形

void get_sin_tab1( unsigned int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = k * sin( hd * i ) + k; tem = ( unsigned int )(fz * 1.0); sinData[i] = tem; printf("%d,",tem); } printf("\r\n"); }

生成数据

void get_sin_tab1( unsigned int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = k * sin( hd * i + PI / 2) + k; tem = ( unsigned int )(fz * 1.0); sinData[i] = tem; printf("%d,",tem); } printf("\r\n"); }

生成数据

800,798,792,782,769,752,732,709,682,653,622,588,553,516,478,439,400,360,321,283, 246,211,177,146,117,90,67,47,30,17,7,1,0,1,7,17,30,47,67,90,117,146,177,211,246, 283,321,360,400,439,478,516,553,588,622,653,682,709,732,752,769,782,792,798

生成波形

void get_sin_tab1( unsigned int point, unsigned int maxnum ) { unsigned int i = 0, j = 0, k = 0; float hd = 0.0; //弧度 float fz = 0.0; //峰值 unsigned int tem = 0; j = point / 2; //水平线位置单片机没有负电压水平线为点值数量的一半 hd = PI / j; // π/2 内每一个点对应的弧度值 k = maxnum / 2; //最大值一半 for( i = 0; i < point; i++ ) { fz = k * sin( hd * i + PI / 2 + PI ) + k; tem = ( unsigned int )(fz * 1.0); sinData[i] = tem; printf("%d,",tem); } printf("\r\n"); }

生成数据

0,1,7,17,30,47,67,90,117,146,177,211,246,283,321,360,399,439,478,516,553,588,622 ,653,682,709,732,752,769,782,792,798,800,798,792,782,769,752,732,709,682,653,622 ,588,553,516,478,439,400,360,321,283,246,211,177,146,117,90,67,47,30,17,7,1

生成图形

通过上面几种示例可以看出，不同的计算公式生成的数据也略有差异，但是本质还是对于弧度的转换。

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正弦波数据表

正弦波数据表

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