摘要
对声频定向信号预处理方式进行了系统的分析,得出单边带调制预处理方式是理想的选择。研究了锁相环技术的组成及原理,并改进后应用于信号的移相,设计了基于锁相环技术的单边带调制电路,对电路进行了仿真,制作了相应的信号处理板。克服了传统的模拟移相技术移相不准确的缺点,通过搭建简单的模拟电路降低了数字调制方法的成本,得到了理想的信号包络,达到了预期的效果。
Methods of the directional audio signal pretreatment are analyzed, and the single sideband modulation is the most appropriate method. The principle of phase-lock link techniques is expatiated and applied in signal phase shifter. Single sideband circuit based on phase-lock link is designed and simulated. The disadvantage of traditional methods for shifting phase imprecise is overcomed. The cost of digital processor is reduced and the perfect signal enveloping is gained.
出处
《电声技术》
2008年第12期28-32,共5页
Audio Engineering
关键词
单边带调制
声频定向
信号处理
锁相环
single sideband modulation
directional audio
signal processor
phase-lock link
