【作者】 尹爱军；

【导师】 汤宝平；

【作者基本信息】 重庆大学 ， 机械电子工程， 2003， 硕士

【摘要】 音频分析被广泛用于测量各类音频系统的时域特性、频域特性及失真特性等，而进行比较完整的音频测试分析需要购置各种价格昂贵的专用仪器，而且需要整合成整套的音频测试系统，这对于普通用户来说存在一定的困难。智能控件化虚拟仪器是测试仪器发展的一个全新模式。将智能控件化虚拟仪器技术应用到音频分析仪的设计与制造中，给音频分析仪带来了全新的面貌。论文介绍了智能控件化虚拟仪器的原理，其基本思想是：将一些虚拟控件经“功能赋予” 后与仪器功能进行“测试融合”从而形成“智能仪器单元”，通过“积木式拼搭”，直接在PC机内形成各种类型的虚拟仪器并显示在屏幕上供用户使用。这些“智能仪器单元”称为智能虚拟部件，这是一种被仪器功能激活了的，有生命的虚拟控件，既描述了智能控件化虚拟仪器的形象，也描述了它的本质。论文研究了音频分析的测试内容和意义及所用到的各种方法，完成了智能控件化音频分析仪的功能建模。在音频设备的时域特性分析中，阶跃脉冲响应检测是衡量系统性能的重要方法，它反映的是音频设备对于突变信号的响应灵敏度。音频设备对于信号的重放能力是由其频率响应特性来衡量的。分析音频设备的频率响应特性主要有单音信号检测法、噪声冲击检测法和最大长度序列检测法等。其中最大长度序列法在测量效率以及抑制噪声方面有比较明显的优势，因此近来得到比较广泛的应用。谐波失真是音频设备最常见的一种非线性失真，它直接影响到音频设备的重放效果，谐波失真曲线图反映出设备在整个音频范围内的失真分布情况，是衡量设备性能的重要参数。论文综合应用智能控件化虚拟仪器思想、结构化设计思想、软件总线思想、三层结构思想，介绍了智能控件化音频分析仪的系统构成，在VMIDS开发系统内完成了仪器的拼搭和实现。功能层提供了丰富的测量及分析功能，包括音频信号频率测量、电压测量、失真测量、时域幅值分析、频域幅值分析和失真分析等；拼搭场内实现了系统的表示层。通过实测典型的音频设备，即音箱的扬声器单元来检测智能控件化音频分析仪的实用效果，得到扬声器单元的各种音频特性参数更多还原

【Abstract】 Audio analysis is widely used to measure time domain, frequency domain and distortion characteristics of various audio system. An all-around audio test and analysis needs all kinds of expensive special instruments, which should be well organized. Obviously, it is not a piece of cake for common user. And the Intelligent Controls-oriented Virtual Instrument is a fire-new model in development of measure instrument. It bring a fire-new appearance to audio analyzer that using the technology of Intelligent Controls-oriented Virtual Instrument in the manufacture design of it.The paper introduces the general ideal of Intelligent Controls-oriented Virtual Instrument What the ideal is that intelligent cells of instrument can compose various instruments, and can show them to user on PC, which are derived from virtual controls by combine virtual control and functions of instruments through functions endowing. The intelligent cells of instrument named Intelligent Virtual Controls is a kind of living virtual part endowed instrument functions, which describe the appearance and the essential of Intelligent Controls-oriented Virtual Instrument.The contents, purposes and methods of audio analysis are studied in this paper. In Amplitude Analysis in time domain, the step impulse response acts as an important parameter to evaluate the performance of audio device. It reflects the response sensitivity of audio system to sudden changed signals. Audio devices’ performances in playback are evaluated by their frequency response in the whole audio frequency range. There are several widely used methods to acquire the frequency response graph, including single tone method, multiple tone method, noise impulse method and Maximum Length Sequence signal impulse method. The last method, MLS signal impulse, has so obvious predominance in the aspect of decreasing noise as to obtain increasingly wide use. Harmonic distortion is one of the most common non-linear distortions, and it affects the playback performance of audio devices directly. Harmonic distortion graph reflects the distortion distribution in the whole audio frequency range.Adopting Intelligent Controls-oriented Virtual Instrument, Structured Design thought and software bus thought synthetically, the article introduced the constitution of intelligent controls-oriented audio analyzer, built the apparatus, and implemented the functions in the developing system of VMIDS. The layer of function provides versatile<WP=6>measure and analysis functions to meet the requirement of audio devices, including measure of audio signal’s volt, frequency and distortion, Amplitude Analysis in time domain, Amplitude Analysis in frequency domain, analysis of distortion, etc. The layer of denotation was implemented by the building field .The loudspeakers of sound box are tested using virtual audio analyzer, and some audio characteristics are obtained更多还原