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ID:36776310
大小:1.99 MB
页数:52页
时间:2019-05-15
《基于耳道的声压级信号计量仪》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、声压级信号耦合主要在仿真耳中完成,仿真耳根据国际电工委员会的相关标准进行设计,耦合腔与测试传声器zR‘匕l--.够紧密配合,满足声压级信号测量的声压场环境,使声压级信号能充分耦合到电路中。放大器可对小信号进行放大,并对待放大信号进行带通滤波器,将频率限制在20Hz⋯.20KHz,放大后的信号满足CODEC线性输入的要求,即进入其线性输入端的电压信号不超过1Vrms。数字控制系统可实现对放大器的增益控制、CODEC的采样、计算结果的显示。关键词:声压级信号计量,SPL,仿真耳,分档放大器,DSP分类号:T
2、P205TP206+.3●,ABSTRACT:A。BSTRACTThispaperinvolvesameasurementinstrumentsformedicalhearingdevices.Measurementinstrumentsofmedicalhearingdevices,includingthreeparts:signalcoupling,amplifiers,digitalcontrolsystem,inthesimulatedenvironmentofthehumanearcanal,
3、couplesthesoundpressurelevelsignalsintothecircuitwithatestmicrophone,weCallevaluatethelisteningdevices’performancebymeasuringsoundpressurelevelsignals.Inthesimulationearsoundpressurelevelsignaliscoupledintocircuitboard,andthesimulationearcanbedesignedacc
4、ordingtotheInternationalElectrotechnicalCommissionstandards,couplecavityandthetestmicrophoneworkcloselytogether,meetingthesoundpressurefieldenvironmentofthesoundpressurelevelmeasurement,whichpromoteSPLsignalcouplingintocircuitboardfully.Theamplifierampli
5、fysmallsignalsandgivesafrequencyrangeforthemeasuredsignals:20Hz⋯.20KHz,andtheamplifiedsignalsmustmeettheLINEINrequirementsofCODEC,thismeansthesignal’Svoltagemustbelessthan1Vrms.Digitalcontrolsystemwillcontroltheamplifiergain,CODECsamplingandresultsshowin
6、g.KEYWORDS:SoundPressureLevelsignalmeasure,SPLSimulationear,Grading-amplifier,DSPCLASSN0:TP205:TP206+目录中文摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..IIIABSTRACT............................................................I、f第l章综述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯’⋯⋯⋯l1.1项目背景及意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
7、.11.2国内外研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.21.3本文的研究工作⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.3第2章整体方案⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..42.1SPL信号耦合与放大器⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..52.1.1SPL信号耦合⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯62.1.2放大器⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..72.2数字系统控制⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯82.3本章小结⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.8第3章SPL信号耦合与放大器⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
8、..103.1SPL信号耦合⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯103.1.1仿真耳⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.113.1.2前置放大器⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯123.2放大器⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..163.2.1分档放大器电路设计⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.163.2.2增益控制⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..193.3A/D变换与CODEC⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..203.3.1A/D采样⋯⋯⋯
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