车载音响中的数字调谐系统设计

Design of Digital Tuning System of Vehicle Sound Equipment

介绍了车载音响中数字调谐系统的设计,概述了PLL(锁相环)频率合成的原理,给出了利用凌阳单片机实现车载音响数字调谐功能的方法,阐述了数字调谐中低通滤波电路的设计原则和自动搜索功能的实现流程。

In this paper, a design of digital tuning system of vehicle sound equipment is introduced.After introducing principle of PLL frequency synthesizer, the method of using Lingyang MCU to realize digital tuning is introduced. The design principle of the lowpass filter circuit is discussed, and also, the flow chart of auto-searching is presented.