【正文】 ......................................................................... 1 虛擬儀 器國內外研究現(xiàn)狀 ................................................................................ 3 課題的意義 ............................................................................................................... 4 課題內容 ................................................................................................................... 5 2 系統(tǒng)基本功能描述及軟硬件 概述 ................................................................................. 6 系統(tǒng)基本功能描述 ................................................................................................... 6 軟件 LabVIEW 概述 ................................................................................................ 6 LabVIEW 的結構 .............................................................................................. 7 LabVIEW 模板分析 .......................................................................................... 8 工具模板 （ Tools Palette） ......................................................................... 8 控制模板 (Controls Palette) ......................................................................... 9 功能模板 (Functions Palette) ..................................................................... 10 硬件聲卡概述 ......................................................................................................... 11 聲 卡工作原理 .................................................................................................. 11 聲卡的工作流程 .............................................................................................. 12 聲卡主要技術指標 .......................................................................................... 12 3 系統(tǒng)整體方案和各組成部分方案設 計 ....................................................................... 13 系統(tǒng)整體方案設計 ................................................................................................. 13 波形發(fā)生部分方案設計 ......................................................................................... 13 仿真信號發(fā)生器 Simulate Signal. vi .............................................................. 15 多諧信號附加噪聲的波形發(fā)生器 Tones and Noise Waveform .vi ............... 17 公式節(jié)點產(chǎn)生仿真信號 .................................................................................. 19 聲音輸出部分方案設計 ......................................................................................... 21 圖形顯示部分方案設計 ......................................................................................... 22 Waveform Chart ............................................................................................... 22 Waveform Graph .............................................................................................. 24 XY Graph ......................................................................................................... 25 4 音頻信號發(fā)生器系統(tǒng)的設計與結果顯示 ................................................................... 26 音頻信號發(fā)生器前面板的設計 ............................................................................. 26 音頻信號發(fā)生器流程圖設計 ................................................................................. 28 II 音頻信號發(fā)生器運行結果顯示 ........................................................................... 31 單聲道音頻信號發(fā)生器運行結果顯示 .......................................................... 31 雙通道音頻信號發(fā)生器運行結果顯示 .......................................................... 32 5 音頻信號發(fā)生器系統(tǒng)的調試和結果分析 ................................................................... 34 6 結論 ................................................................................................ 錯誤 !未定義書簽。論文在簡要介紹了虛擬儀器概念、研究現(xiàn)狀、發(fā)展趨勢以及編程軟件 LabVIEW 特點的基礎上，概述了音頻信號發(fā)生器的基本原理 ,分析了聲卡的功能及相關設置，并對構成系統(tǒng)的各模塊做了詳細敘述。它 以軟件為核心 ， 把計算機技術和儀器技術完美結合起來，充分應運飛速發(fā)展的計算機技術來實現(xiàn)和增強傳統(tǒng)儀器的功能。虛擬儀器開創(chuàng)了儀器使用者可以成為設計者的新時代，代表了儀器發(fā)展的方向，它已成為 21 世紀測試技術和儀器技術發(fā)展的主要方向。 關鍵詞 :虛擬儀器；音頻信號發(fā)生器； LabVIEW；聲卡 Virtual Audio Signal Generator Based on LabVIEW Abstract: With the development of puter and microelectronics technology, virtual instruments appear. Virtual instruments achieve the perfect bination of puter science technology and instrument technology through taking the software as the core technology. Virtual instruments realize and enhance the functions of traditional instruments by developing puter technology .Virtual instruments initiate the new era that the instrument users can be the instrument designers. Virtual instruments represent the direction of instruments and it has bee the main direction of technological development in the 21st century testing technology and instruments. This design used graphical programming software LabVIEW to design virtual audio signal generator, exactly adjusting the trend of the instrument development, and truly achieve software that is hardware. In order to reduce production costs and implement single channel and dual channel output of mon analog periodic signals based on LabVIEW, the design also bring forward to replace the expensive mercial data acquisition card with PC sound card. It has broad application and development prospect. Based on brief introduction of virtual instruments concept, present conditions ,developing trends and characteristics of programming software LabVIEW ,the basic principles of audio signal generator are outlined , the function and relative configurations of sound card are analyzed, and details of each system posing module is presented. Key words: virtual instrument。 參考文獻 ............................................................................................................................. 38 致謝 ...................................................................................................... 錯誤 !未定義書簽。 1986年美國國家儀器公司 (National Instrument)首先提出了虛擬儀器的概念，它有別于傳統(tǒng)的測試儀器， 功能和性能已被 不斷地提高，如今在許多應用中 已成為 傳統(tǒng)儀器的主要替代方式。由于計算機的性能價格比不斷改進， 這