基于聲卡的labview的數(shù)據(jù)采集與系統(tǒng)分析(專業(yè)版)
【正文】 在 PC上配置多塊聲卡并行工作，完全可以構(gòu)成一個(gè)多通道數(shù)據(jù)采集系統(tǒng)，滿足特定應(yīng)用范圍內(nèi)數(shù)據(jù)采集的需要。聲卡的采樣頻率分為 8000Hz、 11025Hz、 22050Hz和44100Hz，應(yīng)根據(jù)具體情況采用合適的頻率。 目前一般的聲卡最高采樣頻率可達(dá) 96KHz；采樣位數(shù)可達(dá) 16位甚至 32位；聲道數(shù)為 2，即立體聲雙聲道，可同時(shí)采集兩路信號(hào)，需要時(shí)還可選用多路輸入的高檔聲卡或配置多塊聲卡；每路輸入信號(hào)的最高頻率可達(dá) KHz，輸出 16位的數(shù)字音頻信號(hào)，而 16位數(shù)字系統(tǒng)的信噪比可達(dá) 96dB。如果需要處理直流或緩變信號(hào)，則需要其他技術(shù)的配合。 關(guān)鍵詞： 聲卡；數(shù)據(jù)采集；信號(hào)分析； LabVIEW；多線程 Sound card based Data Acquisition and Analysis System in LabVIEW MA Hairui1， ZHOU Aijun2 (1. Postgraduate Team 2 of Dalian Naval Academy, Dalian 116018, China； 2. Dept. of Equip System and Automation, Dalian Naval Academy, Dalian 116018, China) Abstract： Based on DSP technology and LabVIEW multithreading, this paper brings forward a low price solution of sound card based data acquisition and analysis system, with its advantages of easy implementation, friendly interface and steady performance. In the range of voice frequency， data saving and overloading is successful in LabVIEW. If more sound cards configured in a PC, it’s feasible to build a multi channel realtime DAQ system with high SNR. With broad application prospect, this solution can be extended to the field of speech recognition, ambient noise monitoring and laboratory measurement etc. Key words： sound card； data acquisition； signal analysis； LabVIEW； Multithreading 目前市售的數(shù)據(jù)采集卡都包含了完整的數(shù)據(jù)采集電路和與計(jì)算機(jī)的接口電路，但其價(jià)格與性能基本成正比，一般比較昂貴。 衡量聲
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