【创龙TMS320C6748开发板试用】+无创血压监测中FIR数字滤波器的设计

5297 滤波器

问答对人有帮助，内容完整，我也想知道答案 0 本帖最后由 liuxun318 于 2015-11-20 16:29 编辑由于最近在忙着搭建无创血压监测的前端硬件和手机端APP的设计，有一段时间没来发贴了。今天坐下来好好写写，也希望大家能就里面的问题相互交流。 1、无创血压监测的硬件组成：光电发射LED、MSP430F4618、H桥驱动发射led电路、电源管理电路、4.2V锂电池、W25Q32Flash存储模块、蓝牙从机和按键。血压监测的原理：因心脏射血，从而引起血液和血管壁之间振荡，这一生理现象体现在指端处，当手指放入探头腔体内，单片机通过12位DA模块和外置H桥驱动电路驱动位于手指下表面的光电发射LED交替发出660纳米红光和920纳米的红外光，因为手指皮肉及血液成分会吸收一部分发射光，发射光透过手指后的那部分被位于手指上表面的光电接收LED捕获，而捕获的信号中0.6HZ-18HZ的交流信号为有用信号，如脉搏波。上次因急事离开没能写完，今天接着上文继续写这里有两张图：图一是已经完成开模的无创血压监测的探头，将手指伸进探头腔体内即可测量，如下图所示：图二是无创血压监测的安卓手机端APP：此APP通过蓝牙与探头连接，可以观看到脉搏波的波形。 2 滤波器的设计：通过监测探头已经能准确采集到脉搏波信号了，由于信号的噪声比较大，为得倒光滑干净的信号则需要设计滤波器。这里我要感谢广州创龙能提供TMS320Ｃ6748来来让我能尝试基于浮点型DSP的FIR滤波器设计。已知脉搏波的有用信号是0.6HZ——18HZ的交流信号，要知道所采集到的信号到底有哪些频率成分，并根据所含的频率成分进行滤波器的设计，这里要使用matlab来处理，如图3所示：上图就是原始采集到的信号在matlab中分别经平滑滤波和低通滤波后的波形和频谱图。滤波器的具体设计借助Matlab中的FDAtool，如图4所示：考虑到大部分信号都集中在10HZ以内，因此给低通滤波器的通带截止频率设为10HZ。设计好后，点击菜单栏Target下的Generate C header将滤波器的系数以C头文件的形式导出。 3 基于C6748的FIR滤波器设计这时候打开Startware中的FiR工程，主要做两部分的修改： 3.1 将const float B[N] 中的系数用刚才导出的系数进行替换，并注意修改N的值，这里改为64； 3.2 将FIR_In用无创血压传感器烫头采集到的数据替换，同时也要注意每次出来的数据长度Tn，这里我采集到的数据一帧含有2100个数据。以下贴出仿真的输入信号时域波形图和频谱图，如图5和图6所示：图5 图6 经过低通滤波后的输出信号时域波形图和频谱图，分别如图7和图8所示：图7 图8 通过比较输入信号和输出信号的时域波形，从图5和图7中发现输出信号中噪声得到了有效的滤除，信号变得更光滑了；从频域上看，比较图6和图8，得倒输出依然保持着原始信号的有效频谱成分，并且使主频率成分旁的频率成分得到了抑制，主峰旁的其他频率成分的幅度有所下降。 4血压的计算原理以上内容已经能初步得倒比较好的脉搏波信号了，接下来就是如何利用脉搏波信号来提取出血压的信息了。这也是我读研究生期间的一个研究方向，各位同仁有感兴趣的可以参考这篇文献：来自桂林电子科技大学梁永波博士的《基于容积脉搏波的无创连续血压测量系统》这篇文章。里面讲的很清楚，也有具体的详细推导过程。最后附上我的无创血压监测传感器探头采集到的原始脉搏波数据，大家对脉搏波处理有兴趣可以拿去做一下类似的实验，希望集大家的智慧能提取出更多的有效的生理信息。 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2015-11-20 16:29:56　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × 柑橘与柠檬该类别下有 19 个回答。邀请回答 ruanjianming 该类别下有 11 个回答。邀请回答 jinyi7016 该类别下有 11 个回答，其中被选为最佳答案 2 次。邀请回答翟荣会该类别下有 10 个回答。邀请回答 24不可说该类别下有 9 个回答，其中被选为最佳答案 9 次。邀请回答 zuqiuxiaozi_srx 该类别下有 8 个回答。邀请回答陈该类别下有 8 个回答。邀请回答 dsphahaha 该类别下有 8 个回答。邀请回答 zercola 该类别下有 8 个回答。邀请回答武-之-魂该类别下有 8 个回答。邀请回答大蜜该类别下有 8 个回答。邀请回答云中月1 该类别下有 8 个回答。邀请回答 pannybei888 该类别下有 7 个回答。邀请回答王立峰该类别下有 7 个回答。邀请回答 xxdjx0206 该类别下有 7 个回答。邀请回答 sunyu817 该类别下有 7 个回答。邀请回答北纬该类别下有 7 个回答。邀请回答 lz_1995 该类别下有 7 个回答。邀请回答 tmmdh 该类别下有 6 个回答。邀请回答用户名WTF 该类别下有 6 个回答。邀请回答举报 liuxun318 相关推荐 • 广州创龙TMS320C6748 DSP开发板免费申请试用 5013 • 广州创龙TMS320C6748 DSP开发板免费申请试用 4352 • 广州创龙TMS320C6748 DSP开发板 3490 • 【创龙TMS320C6748开发板试用】开箱啦 5027 • 【创龙TMS320C6748开发板试用】+ SYSBIOS一些函数的源码在哪里？ 4792 • 【创龙TMS320C6748开发板试用】广州创龙DSP TL6748之我这几天的学习 5258 • 【创龙TMS320C6748开发板试用】【二牛】开箱贴 4573 • 基于FPGA的FIR数字滤波器该怎么设计？ 2078 • 有谁用过创龙的c6748开发板吗？ 12163 • 如何设计数字滤波器？ 2107 5个回答

答案对人有帮助，有参考价值 0 怎么上传后图与图标会错位呢

2015-11-20 16:32:01 评论举报 liuxun318

答案对人有帮助，有参考价值 0 楼主发布资源辛苦了，谢谢分享！！！！！！！！

2015-12-25 09:34:34 评论举报 wangwo28