In natural environment , the signal always masked by interfering noise , that the critical problem is auditory system how to catch the signal under the noise conditions and what neural mechanism underlying it 現(xiàn)實(shí)環(huán)境中,所需信號常被空間上分散的噪聲所掩蔽,因此中心問題是聽覺系統(tǒng)如何抽提信號和在掩蔽存在的情況下完成其聽覺任務(wù)。
This thesis mainly describes a tesing and consoling kit based on ni " s special virtual instrument software development kit - labwindows / cvi , aming at traditional testing device " s limitation such as high cost of hardware , complexity of construct , singleness of function etc . the tesing and consoling kit can condition the signal intermixed with interfere noise and deal with the collected datum through common signal conditioning ( amplification , isolation multiplex filtering ) - , software calibration digital filtering etc to analyse signal in time and frequency domain 本文針對傳統(tǒng)測量設(shè)備硬件成本高、構(gòu)造復(fù)雜、重用性差、功能單一等方面的問題,著重探討了利用ni的labwindows cvi這一虛擬儀器開發(fā)軟件構(gòu)建的測控平臺,通過通用信號調(diào)理(如放大、隔離、多路轉(zhuǎn)換、模擬濾波等) 、軟件校正、數(shù)字濾波等方法對混雜有干擾的信號進(jìn)行調(diào)理及采集后的數(shù)據(jù)進(jìn)行處理,然后進(jìn)行時域或頻域的分析。
Nowadays , the equipments of uroflowrate mensuration which are adopted by the medical treatment departments of our country are the facilities in which the kernel chips are single chip micyoco ( mcssl ) . their ability of data process is limited , especially at the situation where we need the higher precision of result . furthermore , they are poor in filter the interfere noise which is mixed with the signal 當(dāng)今國內(nèi)的醫(yī)療部門所采用的尿流率測量設(shè)備是以單片機(jī)( mcs51 )為核心的處理系統(tǒng),對數(shù)據(jù)的處理能力有限,尤其是在精度要求較高的場合,對信號中疊加的噪聲干擾信號的濾除效果較差。