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