音频信号分析仪  

Audio Signal Analyser

作　　者：杨宇薇[1] 杨国华 

机构地区：[1]三峡大学,湖北宜昌443002 [2]衢州市电力局,浙江衢州324000

出　　处：《仪表技术》2013年第6期42-44,共3页Instrumentation Technology

摘　　要：系统采用Atmega128单片机作为主控制器,并运用快速傅里叶变换(FFT)对音频信号进行频谱分析。输入音频信号经过双门限电路处理后,一路送入A/D采样,另一路经真有效值电路转换后送入A/D采样,结果经单片机处理,最后送液晶显示。该系统测量信号频率范围覆盖20 Hz～10 kHz,电压峰值范围10 mV～10 V,FFT得到的频谱分辨率为20 Hz,最终可得到音频信号的频谱与正弦信号失真度。The system adopts a new type single chip Atmegal128 as its host controller. Fast Fourier transformation （FFT） is used to analyze audio signal. After going through double threshold circuit, one input channel signal is put directly into the AD convert circuit and the other input channel signal is converted by RMS circuit and then outputs to the AD converter. With the disposal of the single chip, the result is displayed by the liquid crystal. This system can accurately measure the audio sig- nal frequency range of 20 Hz- 10 kHz, the peak voltage range of 10 mVpp- 10 Vpp, resolution ratio of 20 Hz. Finally, the sys- tem provides us with the distortion degree of the frequency spectrum and sinusoidal signal.

关 键 词：快速傅里叶变换 频谱分析 失真度 

分 类 号：TN911.6[电子电信—通信与信息系统]