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将信号转换到频率域的处理方法,使人们对声学、振动以及其它低频现象的了解有很大提高,如果这一转换高速进行.则动态数据能“在线”或“实时”处理,这种实时频谱分析的每一次革命出现在20年以前。它利用快速傅氏变换(FFT),用全数字式的仪器代替了模拟式分析仪。现在,第二次革命正在进行着。随着功能强大而价格低廉的个人计算机(PC)的出现,在一台 PC 机中加入适当的插件板和软件即能有效地进行频谱分析和其它功能,这就是所谓基于个人计算机的频谱分析仪(以下称 PC 分析仪)。本文就这种 PC 分析仪的成长过程及其与传统的硬件武仪器(以下称硬件分析仪)的比较作详细叙述。由于所采用的软件/硬件系统是多种多样的,因此本文就其性能上的重大差异作了介绍,并且在部分地观察了传统的硬件分析仪和最近的 PC 分析仪产品的基础上,本文试预测 PC 分析仪将在何种程度上代替硬件分析仪。
The processing of the signal into the frequency domain greatly increases the understanding of acoustics, vibrations and other low-frequency phenomena. If this conversion is done at high speed, the dynamic data can be processed “online” or “real-time” Every revolution in spectrum analysis occurred more than 20 years ago. It uses Fast Fourier Transform (FFT) to replace an analog analyzer with a fully digital instrument. Now, the second revolution is going on. With the advent of powerful and inexpensive personal computers (PCs), spectrum analysis and other functions can be efficiently performed by adding the appropriate boards and software to a PC, which is called a personal computer-based spectrum analyzer (Hereinafter referred to as PC Analyzer). In this paper, the growth process of this PC analyzer and its comparison with the traditional hardware Wu instruments (hereinafter referred to as hardware analyzer) are described in detail. Because of the variety of software / hardware systems used, this paper presents a description of the significant differences in performance and, based in part on the observation of traditional hardware analyzers and more recently PC analyzer products, Predict how far PC analyzers will replace hardware analyzers.