一种新型的电脑键盘按键声信号采集方法  

A new method to detect the sound of computer keyboard

作　　者：张梦玉 王绪隆 张仲宁[1,2] 李杰 杨京 梁彬[1,2] 程建春 ZHANG Mengyu;WANG Xulong;ZHANG Zhongning;LI Jie;YANG Jing;LIANG Bin;CHENG Jianchun(Institute of Acoustics,Nanjing University,Nanjing 210093,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China;Suzhou Bangguan Automation Company,Suzhou 215000,China)

机构地区：[1]南京大学声学研究所,南京210093 [2]人工微结构科学与技术协同创新中心,南京210093 [3]苏州邦冠自动化有限公司,苏州215000

出　　处：《应用声学》2020年第3期445-452,共8页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11374157)。

摘　　要：传统的电脑键盘按键声信号采集方法是采用造价较高的低噪声马达以恒定的速度敲击键盘按键,通过传声器远距离采集键盘的按键声,该方法在自然环境下受环境噪声影响大,需在低噪声环境中进行,因此很难在工业上大规模使用。该文提出了一种新型的电脑键盘按键声信号采集方法,首先采用模拟信号驱动电磁铁模拟手指敲击键盘按键,然后通过缩小检测距离和设计隔声腔有效实现对环境噪声的隔离,最终使传声器有效采集键盘按键声信号。该方法有利于同类型设备在工业上的大规模使用,并可大幅度降低设备生产成本。The traditional sound detection of computer keyboard uses a mute-motor to tap the cap of keyboard.Besides,the process of detection must be in the silent room.The cost of sound detection is very expensive so that it can’t be used widely.In this letter,we propose an advanced method to detect the sound of keyboard.First,the electromagnet,which is driven by the analog signal,taps the cap of keyboard.By this way,the process of tapping caps can be perfectly simulated.Then we designed a cavity,which can insulate the background noise effectively.The microphone was placed in the cavity and near by the electromagnet and keyboard,which can improve the signal-noise ratio effectively.The proposed design could open up an alternative avenue for the sound detection of computer keyboard.

关 键 词：按键异声检测 模拟手指敲击 微弱信号采集 隔声腔 

分 类 号：O429[理学—声学]