基于LabVIEW音頻測試系統設計

電子信息工程論文編號:DZXX128  論文字數:9396,頁數:36

 
目錄
摘要 I
ABSTRACT II
第1章 引言 1
1.1 背景 1
1.2 研究內容 1
第2章 音頻測試系統 3
2.1 Labview概述 3
2.2 音頻測試系統結構 3
2.2.1 音頻測試結構圖如下 3
2.2.2 音頻測試系統硬件模塊放大電路 3
2.2.3 濾波電路 5
2.2.4 LM324功能介紹 6
2.3音頻測試系統軟件模塊 6
第3章 音頻分析原理 9
3.1 數字信號處理基本理論 9
3.1.1 傅立葉變換 9
3.1.2 信號的采樣 10
3.2 失真分析 13
3.3 相關分析 14
3.3.1 自相關函數 14
第4章 音頻測試系統設計 16
4.1 音頻測試系統硬件電路 16
4.2 LABVIEW程序的后面板 16
4.2.1 音頻測試系統時域模塊 16
4.2.2 音頻測試系統的頻域模塊 17
4.2.3 音頻測試系統音頻信號失真模塊 18
4.2.4 音頻測試系統音頻信號自相關模塊 18
4.3 LABVIEW程序的前面板 19
4.4 音頻測試系統數據結果分析 21
第5章 結束語 27
致謝 29
參考文獻 30
附錄 31

摘要
 隨著微電子技術、計算機技術、網絡通信技術和軟件技術的高速發展,傳統的儀器開始向計算機化的方向發展。虛擬儀器(VI)概念的產生正是基于這樣一種技術背景。虛擬儀器是指具有虛擬儀器面板的個人計算儀器。它利用軟件在微機屏幕上構成虛擬儀器面板,在硬件的支持下對信號進行采樣,既可以進行實時的信號分析、顯示,又可以在離線條件下對存儲的采集結果進行各種軟件處理。通過軟件編寫及硬件配置,虛擬儀器可以實現完全由用戶自己定義、適合不同應用環境和對象的各種功能。虛擬儀器技術在國內正處于蓬勃發展之中,在測試、測控、教學、科研等領域獲得了廣泛的應用。
 本文介紹了將虛擬儀器技術引入到音頻分析儀器的設計,采用LabView編寫程序。通過測試典型的音頻放大器,檢測虛擬式音頻放大器測試的實用效果,測量音頻信號的電壓與頻率、時域幅值分析、頻域分析、失真分析和信噪比等。
 本文分析了基于LabView音頻測試系統的工作原理。對基于LabView音頻測試系統進行模塊化分析,其中,重點介紹了時域分析、頻域分析。
 
關鍵詞：音頻測試系統,時域分析,頻域分析
 
 
 
ABSTRACT
 With micro-electronics technology,computer technology, network communications
 technology and the rapid development of software technology, the traditional computerized equipment have began to develop in the direction of。Virtual Instrument (VI) concept is based on the formation of such a technical background。Virtual machines refer to a virtual instrument panel of personal computing equipment。It used computer software on the screen in a virtual instrument panel, with the support of the hardware in the signal sampling, can conduct real-time signal analysis, display, but also in offline storage under the condition of the acquisition deal with the results of various software。Through the preparation of software and hardware configuration, virtual instrument can be achieved solely by the user's own definition, suitable for different applications and objects of various functions。Virtual instrument technology in the country is in a vigorous development, testing, monitoring and control, teaching, scientific research in areas such as access to a wide range of applications。
 This paper presents a virtual instrument technology will be introduced to the analysis of audio equipment design, use of LabView programming, Pass the test of a typical audio amplifier to detect virtual audio amplifier test the practical effects, the audio signal measuring voltage and frequency and amplitude of time-domain analysis, frequency analysis, distortion and signal to noise ratio analysis, and so on。
 This paper analyses the LabView-based audio test system works。LabView-based audio test system of modular, which focuses on a time-domain analysis, frequency analysis。
 
Keywords: Audio Test System, Time-domain analysis, Frequency domain analysis