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采样定理和FFT是数字信号频谱分析仪的重要技术,本文根据数字信号分析仪的原理,同时根据实际设计的指标要求,详细介绍了音频信号分析仪的设计流程。由于采样模块和信号处理模块关系了整个系统的性能,因此在本文中详细介绍了系统硬件的设计,尤其是芯片的选择。据设计指标进行了合理的选择,最终确定将TI公司的高速DSP芯片TMS320F2812作为本系统的核心处理器,MCP3240作为采样电路核心器件,附加信号预处理模块和显示模块;同时也给出了系统的软件设计流程。根据系统测试数据可以看出,该系统设计在处理速度、准确度等指标方面都超出了设计指标要求。
Sampling theorem and FFT are the important technologies of digital signal spectrum analyzer. According to the principle of digital signal analyzer, this paper introduces the design flow of the audio signal analyzer in detail according to the actual design requirements. Because the sampling module and the signal processing module are related to the performance of the whole system, the hardware design of the system is introduced in detail in this text, especially the choice of the chip. According to the design index, a reasonable choice was made. Finally, TI’s high-speed DSP chip TMS320F2812 was selected as the core processor of this system. The MCP3240 was used as the core of the sampling circuit, and the signal preprocessing module and the display module were added. At the same time, Software design process. According to the system test data can be seen that the system design in the processing speed, accuracy and other indicators are beyond the design requirements.