摘要
传统扬声器系统在给人们生活带来便利的同时,也产生了很多噪声污染,比如广场舞音响,超市促销宣传喇叭;为了缓解噪声污染,构造独立的语音空间,提升大众生活质量,实现了基于FPGA的声频定向扬声器的设计;通过自主开发信号处理单元,设计功率放大电路,探究超声波换能器数目与指向性的影响,最终在FPGA上实现了信号的调制,不仅完成了可听声的定向传播,而且使系统具有更好的频率响应特性,从而构造出独立的语音空间,从根源上缓解噪声污染;除此之外,该系统在一定环境下进行了指向性测试,测试结果表明设计出的系统具有较强指向性,可以广泛用于国际会议、银行保密性通话、博物馆展厅等场合,无论军用还是民用,声频定向扬声器系统都具有极大的应用潜力。
Audio directional system is a kind of apparatus that can realize the audible sound propagation in a certain area. And an audio directional loudspeaker system based on FPGA has been designed successfully eventually by designing the signal processig unit and a power amplifier circuit. In addition, the system has conducted directional test under certain environment, which shows that the designed system has strong directivity.
出处
《计算机测量与控制》
2018年第2期154-157,共4页
Computer Measurement &Control
基金
国家自然科学基金(61601175)
