简易数字显示声音信号采集测量仪Word文档下载推荐.docx
- 文档编号:16449912
- 上传时间:2022-11-23
- 格式:DOCX
- 页数:25
- 大小:129.54KB
简易数字显示声音信号采集测量仪Word文档下载推荐.docx
《简易数字显示声音信号采集测量仪Word文档下载推荐.docx》由会员分享,可在线阅读,更多相关《简易数字显示声音信号采集测量仪Word文档下载推荐.docx(25页珍藏版)》请在冰豆网上搜索。
前级信号调理电路采用一级跟随器和同相放大电路,将信号输入电压分为5档,如图3.1所示,取
则由放大倍数公式可求得R值分别为:
。
本模块采用两片OP07构成一级跟随器和一级同相放大电路,主要用于实现系统阻抗变换和弱信号放大。
由于AD转换芯片的模拟输入端口为容性负载,对输入信号会造成严重的波形失真,采用两级运放可以消除误差,同时达到阻抗匹配的目的。
图1:
音频信号放大电路
2.3真有效值变换
负载网络和取样电阻上采集的是的交流电压信号,如果直接送单片机A/D进行处理,会增大系统误差。
为把系统误差控制在题目要求的范围内,我们在每一个信号的输入和输出级都进行有效的处理。
为此,为测量交流电平电压有效值的测量,采用RMS-DC变换器集成芯片AD536。
频带很宽,它可以测量到频率为300kHz、电压值在100mV以上带有3dB误差的信号电平。
利用外部提供的参考电压,用户能方便设置0dB电平,使其可以对应于从0.1V到2V之间的任何有效值。
2.4过零比较电路
为了得到声音信号设频率值,我们将信号通过过零比较电路,电路主要有LM339构成,其输出电压和TTL,DTL,ECL,MOS,CMOS兼容,最大偏置电压是7mv,微分输入电压范围和电源电压相等。
具体的电路如下图
图2、真有效值电路和过零比较电路
三:
软件设计
单片机主要控制数据的采集,计算,键盘输入响应,液晶显示,以及声光报警模块的响应,具体过程如下图:
四系统调试与系统测试
4.1系统调试
根据方案设计要求,调试过程公分三大部分,硬件调试,软件调试,软件和硬件联调。
电路按模块逐个调试,各模块调试通过后在联调。
程序先在最小系统板调试,通过后在软硬联调。
硬件调试主要是考虑怎么把各个模块的测量误差降到最低,把误差控制在最小范围内。
A/D转换的精度、真有效值转换的测量误差、取样电阻的精度、放大电路的倍率等都是系统的主要误差来源。
由于在系统的硬件设计中考虑到各个部分电路的误差分配,尽量将误差降低到最小。
软件和硬件的联合调试过程中,我们运用的相应的软件补偿和硬件补偿措施,保证把误差控制在一个小范围内波动。
4.2测试数据
(1)频率测量
输入频率
20HZ
100HZ
500HZ
1000HZ
10KHZ
20KHZ
30KHZ
测试频率
999HZ
9986HZ
19976HZ
29968HZ
频率误差
0%
0.1%
0.14%
0.12%
0.11%
由表可以看出声源信号的频率远远超过了题目所要求的范围,达到了30KHZ,频率的误差几乎可以忽略,满足了题目的要求。
(2)声级测量
F
Vp-p
1.0V
14.3db
14.2db
14.4db
1.5v
21.5db
21.6db
21.7db
2.0v
29.3db
29.4db
29.2db
29.1db
2.5v
36.3db
36.2db
3.0v
43.5db
43.6db
43.7db
3.5v
50.8db
50.7db
50.9db
五、结束语
在本次的设计中,我们达到了题目的要求,但在调试系统时,我们也发现了一些小问题,主要是由于单片机端口之间的干扰引起的,在改进的过程中,我们也学到了很多东西,相信通过以后的不断学习,我们的设计会更加完美。
五:
附件
主要程序清单
#include<
MSP430XG46X.H>
#include"
jianpan.h"
lcd.h"
#defineCPU_F((double)1000000)
#definedelay_us(x)__delay_cycles((long)(CPU_F*(double)x/1000000.0))
#definedelay_ms(x)__delay_cycles((long)(CPU_F*(double)x/1000.0))
unsignedchardat_sheng[]={/*--文字:
声--*/
0x02,0x12,0xD2,0x52,0x52,0x52,0x52,0xDF,0x52,0x52,0x52,0x52,0xD2,0x12,0x02,0x00,
0x40,0x30,0x0F,0x02,0x02,0x02,0x02,0x03,0x02,0x02,0x02,0x02,0x07,0x00,0x00,0x00,
};
unsignedchardat_ji[]={/*--文字:
级--*/
0x20,0x30,0xAC,0x63,0x20,0x18,0x02,0x82,0x7E,0x82,0x42,0x72,0x4E,0xC0,0x40,0x00,
0x10,0x13,0x11,0x49,0x29,0x91,0x8C,0x43,0x40,0x23,0x14,0x18,0x66,0xC1,0x40,0x00,
unsignedchardat_pin[]={/*--文字:
频--*/
0x20,0x3C,0x20,0x20,0xBF,0x24,0x24,0x00,0xF2,0x1A,0xD6,0x12,0x12,0xF2,0x02,0x00,
0x44,0x43,0x20,0x10,0x0B,0x04,0x43,0x40,0x27,0x18,0x07,0x08,0x10,0x27,0x60,0x00,
unsignedchardat_lv[]={/*--文字:
率--*/
0x00,0x0C,0x14,0xA4,0x04,0x64,0x35,0xAE,0x64,0x24,0x14,0xA4,0x14,0x04,0x04,0x00,
0x08,0x0A,0x09,0x08,0x08,0x0A,0x0B,0xFE,0x0A,0x0B,0x0C,0x08,0x09,0x0A,0x08,0x00,
unsignedchardat_zui[]={/*--文字:
最--*/
0x40,0x40,0xC0,0x5F,0x55,0x55,0xD5,0x55,0x55,0x55,0x55,0x5F,0x40,0x40,0x40,0x00,
0x20,0x20,0x3F,0x15,0x15,0x15,0xFF,0x48,0x23,0x15,0x09,0x15,0x23,0x61,0x20,0x00,
unsignedchardat_da[]={/*--文字:
大--*/
0x20,0x20,0x20,0x20,0x20,0x20,0xA0,0x7F,0xA0,0x20,0x20,0x20,0x20,0x20,0x20,0x00,
0x00,0x80,0x40,0x20,0x10,0x0C,0x03,0x00,0x01,0x06,0x08,0x30,0x60,0xC0,0x40,0x00,
unsignedchardat_she[]={/*--文字:
设--*/
0x40,0x41,0xCE,0x04,0x00,0x80,0x40,0xBE,0x82,0x82,0x82,0xBE,0xC0,0x40,0x40,0x00,
0x00,0x00,0x7F,0x20,0x90,0x80,0x40,0x43,0x2C,0x10,0x10,0x2C,0x43,0xC0,0x40,0x00,
unsignedchardat_zhi[]={/*--文字:
置--*/
0x00,0x20,0x2F,0xA9,0xA9,0xAF,0xE9,0xB9,0xA9,0xAF,0xA9,0xA9,0x2F,0x20,0x00,0x00,
0x80,0x80,0x80,0xFF,0xAA,0xAA,0xAA,0xAA,0xAA,0xAA,0xAA,0xFF,0x80,0x80,0x80,0x00,
unsignedchardat_bao[]={/*--文字:
报--*/
0x08,0x08,0x88,0xFF,0x48,0x28,0x00,0xFF,0xC1,0x41,0x41,0x49,0x51,0xCF,0x00,0x00,
0x01,0x41,0x80,0x7F,0x00,0x00,0x00,0xFF,0x40,0x23,0x14,0x1C,0x33,0x60,0x20,0x00,
unsignedchardat_jing[]={/*--文字:
警--*/
0x20,0x1A,0xFA,0xAF,0xAA,0xEF,0x0A,0xFA,0x10,0x8F,0x54,0x24,0x5C,0x84,0x04,0x00,
0x02,0x02,0x02,0xEA,0xAA,0xAA,0xAB,0xAA,0xAB,0xAA,0xAA,0xEA,0x02,0x02,0x03,0x00,
unsignedchardat_fan[]={/*--文字:
范--*/
0x44,0x94,0xA4,0x64,0x04,0x0F,0x04,0xE4,0x24,0x2C,0x2F,0x24,0xE4,0x04,0x04,0x00,
0x08,0x09,0xF8,0x04,0x03,0x00,0x00,0x3F,0x40,0x40,0x42,0x46,0x43,0x70,0x00,0x00,
unsignedchardat_wei[]={/*--文字:
围--*/
0x00,0xFF,0x01,0x89,0xA9,0xA9,0xFF,0xA9,0xA9,0xA9,0xA9,0x09,0x01,0xFF,0x00,0x00,
0x00,0xFF,0x40,0x40,0x40,0x40,0x5F,0x40,0x48,0x50,0x4F,0x40,0x40,0xFF,0x00,0x00,
unsignedchardat_shang[]={/*--文字:
上--*/
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFE,0x40,0x40,0x40,0x40,0x40,0x00,0x00,0x00,
0x00,0x40,0x40,0x40,0x40,0x40,0x40,0x7F,0x40,0x40,0x40,0x40,0x40,0x60,0x40,0x00,
unsignedchardat_xia[]={/*--文字:
下--*/
0x00,0x02,0x02,0x02,0x02,0x02,0x02,0xFE,0x22,0x62,0xC2,0x82,0x02,0x03,0x02,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,
unsignedchardat_xian[]={/*--文字:
限--*/
0xFE,0x02,0x32,0x4E,0x82,0x00,0xFE,0x4A,0xCA,0x4A,0x4A,0x4A,0x7E,0x00,0x00,0x00,
0xFF,0x00,0x02,0x04,0x03,0x00,0xFF,0x40,0x20,0x03,0x0C,0x12,0x21,0x60,0x20,0x00,
unsignedchardat_mao[]={/*--文字:
:
--*/
0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00
unsignedchardat_d[]={/*--文字:
d--*/
0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20
unsignedchardat_B[]={/*--文字:
B--*/
0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00
unsignedchardat_H[]={/*--文字:
H--*/
/*--宋体12;
此字体下对应的点阵为:
宽x高=8x16--*/
0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20
unsignedchardat_Z[]={/*--文字:
Z--*/
0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00
unsignedchardat_dian[]={/*--文字:
.--*/
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00
unsignedchardat_0[]={/*--文字:
0--*/
0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00
unsignedchardat_1[]={/*--文字:
1--*/
0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00
unsignedchardat_2[]={/*--文字:
2--*/
0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00
unsignedchardat_3[]={/*--文字:
3--*/
0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00
unsignedchardat_4[]={/*--文字:
4--*/
0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00
unsignedchardat_5[]={/*--文字:
5--*/
0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00
unsignedchardat_6[]={/*--文字:
6--*/
0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00
unsignedchardat_7[]={/*--文字:
7--*/
0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00
unsignedchardat_8[]={/*--文字:
8--*/
0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00
unsignedchardat_9[]={/*--文字:
9--*/
0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00
unsignedchardat_kong[]={
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
structSHENGJI_SHIJIAN{
unsignedcharfen_shi;
unsignedcharfen_ge;
unsignedcharmiao_shi;
unsignedcharmiao_ge;
unsignedintshengji;
};
structSHENGJI_SHIJIANshengji_shijian[10];
unsignedchar*dat_shu[10]={dat_0,dat_1,dat_2,dat_3,dat_4,dat_5,dat_6,dat_7,dat_8,dat_9};
unsignedintmax_shengji[10]={0};
voidxianshi_db();
voidxianshi_zuida();
voidxianshi_pinlv();
voidxianshi_10ge();
voidxianshi_shezhi_hz();
voidCSH_shuzhu();
voidCapture_f();
unsignedcharkey=0;
//键盘值
unsignedcharj=1;
//捕获的是第几个数
unsignedintbuhuo_zhi=0,buhuo_buff=0;
unsignedintADOUT=0;
unsignedintAD_max=0;
unsignedcharflag_ping=0;
//换屏0:
主屏,1:
子屏,2:
子屏,3:
子屏
unsignedcharflag_queren_f=0;
//确认频率报警范围标志
unsignedintflag_max_min=0;
//调整MIN还是MAX标志
unsignedcharmiao_ge=0,miao_shi=0,fen_ge=0,fen_shi=0;
unsignedcharSD_miao_ge=0,SD_miao_shi=0,SD_fen_ge=0,SD_fen_shi=0;
unsignedintMIN_HZ=0,MAX_HZ=0;
//设置最大和最小的频率报警范围
intmain()
{
unsignedinti=0;
//Stopwatchdogtimertopreventtimeoutreset
WDTCTL=WDTPW+WDTHOLD;
P2DIR&
=~BIT0;
//P2.0输入
P2SEL|=BIT0;
//P2.0TA2
init_jianpan();
lcd_init
(1);
lcd_init(0);
/*******************************************************************************/
structSHENGJI_SHIJIANchushihua;
//初始化shengji_shijian[10];
chushihua.fen_shi=0;
chushihua.fen_ge=0;
chushihua.miao_shi=0;
chushihua.miao_ge=0;
chushihua.shengji=0;
for(i=0;
i<
10;
i++)
shengji_shijian[i]=chushihua;
zhiti(0,0,dat_sheng,1);
//显示声级:
dB
zhiti(0,1,dat_ji,1)
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 简易 数字 显示 声音 信号 采集 测量仪