Arduino平台的数字音符实时显示设计

国内外在音频显示领域早已有研究,但都停留在用柱状图定性显示音调高低层面.为了能实时定量显示音调的高低,通过对音频信号进行快速傅里叶变换(FFT),提取基波频率,并将基波频率转化为音符(文中音符都指的是C调下的数字音符),最终用音符在LCD屏幕上显示音频中音调的高低.本设计的创新点是在前人研究基础上,让音频以近似于音乐简谱的形式呈现出来,方便音乐爱好者的认知与学习.

Digital Notes Real-time Display Design Based on Arduino

There have been researches about the audio display,however,all those researches just care about how to show the pitch using the histogram.In order to display the tone more precise in real-time,the fundamental frequency should be extracted after the fast Fourier transform(FFT)of the audio signals.Then the fundamental frequency is converted into the digital notes of C tone.At last,the tone of audio is displayed on the LCD screen in the form of notes.This design makes the audio show approximate to the form of music,which can help people learn and study music.