1/3倍频程频谱分析系统的数字化设计与实现

Design and Implementation of Digital One-third Octave Spectrum Analysis

1/3倍频程的频谱分析是噪声检测中重要的测量项目。针对基于模拟电路的1/3倍频程频谱分析系统存在线路复杂、效率低、鲁棒性差等缺点,提出了全数字化的频谱分析系统方案。详细介绍了整个频谱分析系统的软硬件设计,着重分析了结合多抽样率原理的1/3倍频程实时算法和设计要点,实现对各种稳态与非稳态噪声信号的快速、准确和高精度的测量分析与显示等功能。

1/3 octave spectrum analysis is an important noise measurement.For analog circuits of 1/3 octave existing disadvantages of complex circuitry,low efficiency,poor robustness,the entire digital system based on DSP is designed to achieve high-precision real-time spectrum analysis.Detailed hardware and software design of the spectrum analysis system,emphasis on 1/3octave real-time algorithms used the multlrate principle and design features,realize high-precision measurement in the rapid speed and display functions to the various steady and non-steady noise signals.