基于FPGA的音频分析系统实现

采用Altera公司的FPGA芯片EP2C20作为控制和运算核心，实现对频率范围在20Hz～20kHz的音频信号分析和测试。采用FFT算法对音频信号进行频谱分析和计算处理，实现失真度分析，并完成信号总功率、各分量频率、周期等参数分析测量。采用TFT-LCD作为显示终端，能够直观显示功率谱曲线和各测试参数值。通过软件分析对比测试发现，该系统实时性强，测量准确度高，误差优于0．3％，可以有效完成音频信号分析和处理。

Implementation of Audio Analysis System Based on FPGA

Altera＇s FPGA chip EP2C20 is used as the control and operation core to analyse and test the audio signal in the frequency range of 20 Hz- 20 kHz. FFT algorithm used for spectral analysis and computation of audio signal, distortion analysis, analysing and measuring the signal＇s total power, frequency of each component, period and other parameters. TFT-LCD is used as its display terminal so as to get a directviewing show of power spectrum and test parameters. By software analysis and comparison test, it is proved that this system is strong real-time, with high measurement accuracy and less than 0. 3% error. The audio signal analysis and processing can be completed effectively.