基于Android平台的吉他智能校准系统设计与实现  

Design and Implementation of a Guitar Intelligent Calibration System with Android Platform

作　　者：于阿强 汪方军[1] 孙存[1] 朱锡祥 吕钊[1] 

机构地区：[1]安徽大学计算机科学与技术学院,安徽合肥230601

出　　处：《计算机技术与发展》2017年第7期140-144,共5页Computer Technology and Development

基　　金：安徽省自然科学基金(1408085QF125);安徽大学大学生创新创业训练项目(201510357040)

摘　　要：传统吉他弦音校准主要通过人耳听觉来判断,不仅要消耗大量时间与精力,同时准确性也难以保证。为了解决这一问题,设计并建立了一种便携的基于Android平台的吉他智能校准系统。所建立系统在对原始弦音信号进行去噪、分帧、加窗等预处理后,通过短时能量与过零率进行端点检测,在此基础上,使用傅里叶变换计算端点检测后弦音信号的频率,然后与标准弦音频率进行比较,给出误差供调音者参考。在实验室环境下,以44 100 Hz为采样频率,对10把吉他进行了系统测试验证。测试验证结果表明,经校准后的吉他弦音频率跟标准频率对比的平均误差在2.68%以内,校准精度较为理想;所建立系统操作简单、方便,不仅可以适用于吉他调音,而且也适用于其他弦类乐器的校准。The traditional way to tune a guitar is mainly through hearing, which is not only a waste of time and energy, but also a lack of accuracy. To solve this problem, a portable guitar intelligent tuning system has been designed and established based on Android platform, which uses endpoints detection through short-time energy and zero-crossing counts after the pretreatments including de-noising, framing and windowing of the original sound signal. On the basis of it,Fourier transform is used to calculate the sound signal frequency. Then er- ror between the result and standard sound frequency has been provided available information for tuners. In the laboratory environment, with sampling frequency of 44 100 Hz, 10 guitars have been tested and verified systematically. Results show that compared with standard frequency, the average error of the calibrated guitars＇ sound frequency keeps within 2.68 %, which is satisfying. The system is simple and convenient. It can apply to the tuning of guitar and other stringed instrument.

关 键 词：吉他智能校准 端点检测 快速傅里叶变换 JNI技术 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]