一种声频定向扬声器调制载波产生方法  

Method to Generate Audio Directional Loudspeaker Modulating Carrier

作　　者：王开林[1] 

机构地区：[1]电子科技大学空天科学技术研究院,四川成都611731

出　　处：《电声技术》2012年第3期17-20,共4页Audio Engineering

摘　　要：针对声频定向系统中方波信号谐波过于靠近基波的缺点,以FPGA为控制核心,设计了灵活高速的SPWM(正弦脉宽调制)载波产生系统。根据自然采样法原理计算SPWM信号的脉宽数据,由脉宽控制模块完成SPWM信号输出。通过该方法获得的SPWM信号与早期的载波产生系统得到的方波信号相比谐波分量离基波更远,系统产生的SPWM信号脉宽精度高,工作稳定。In the audio directional system,the harmonic of the square wave signal is too close to the fundamental wave. In order to overcome the shortcomings, a high - speed SPWM carrier system based on FPGA is designed. The SPWM pulse width control data which is obtained under the principle of natural sampling. The SPWM pulse width control block is designed to generate the SPWM signal. The harmonic of the output SPWM is farther away from the fundamental wave, com- pared with the square wave signal generated by the early system. The SPWM generated by the current system also has high precision and stability.

关 键 词：FPGA SPWM 自然采样法 查表法 

分 类 号：TN643[电子电信—电路与系统]