基于DM368的列车数字功放设计及实现  

Design and Implementation of Train Digital Power Amplifier Based on DM368

作　　者：杨兴成[1] 刘全利[1] 

机构地区：[1]大连理工大学控制科学与工程学院,辽宁大连116024

出　　处：《控制工程》2015年第3期382-386,共5页Control Engineering of China

基　　金：国家自然科学基金资助项目(61273037)

摘　　要：为了满足列车能够传输高质量音频信息的需求,设计了一种基于以太网的数字音频功率放大器。设计以TI公司的达芬奇数字媒体处理器TMS320DM368作为语音系统的中央处理器,采用TLV320AIC23BPW对音频信号进行编解码,音频信号的功率放大由数字功放芯片TPA3118D2DAPR来实现。另外,设计采用RS485接口与安装在客室内外多点处的环境噪声采集单元通信实现了广播音量的自动调节,保证乘客在噪杂的环境中能清晰听到广播的内容。首先,介绍设计的总体架构,然后,对主要功能模块的设计与实现进行了详细的描述,最后,简单介绍硬件测试工作。目前,该数字音频功放已被成功应用于列车乘客广播系统领域。In order to meet the requirement that train can transfer a large number of audio information, this paper designs a digital audio power amplifier based on Ethemet. This design adopts TI＇s DaVinci Digital Media Processor TMS320DM368 as the central processing unit of the phonetic system, TLV320AIC23BPW as the audio codec, and digital power amplifier chip as the audio power amplifier. In addition, this design has realized the automatic adjustment of radio volume by using RS485 interface for communication with environmental noise acquisition unit installed inside and outside of the passenger compartments, ensuring that passengers can hear the content of the broadcast clearly in noisy environment. The architecture of this design is analyzed firstly, and then the design and implementation of the main functional module is described in detail, the hardware tests are introduced at last. Now, the digital audio power amplifier has been successfully used in the field of Train Passengers Broadcasting system.

关 键 词：广播系统 以太网 TMS320DM368 数字功放 RS485 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]