双音频在高清安防监控系统中的应用  

Application of Dual Audio in High-definition Security Surveillance System

作　　者：李静[1] 叶志龙[2] 胡克用[1] 

机构地区：[1]杭州师范大学钱江学院电气机械工程系,浙江杭州310012 [2]杭州海康威视数字技术股份有限公司,浙江杭州310012

出　　处：《电视技术》2011年第11期130-132,共3页Video Engineering

基　　金：国家自然科学基金项目(60372058;60772101)

摘　　要：介绍了HDMI数字音频和传统模拟音频两种音频格式在高清安防系统中的应用。当系统输出的视频格式为HDMI高清视频时,音频通道自动将音频数据发送给HDMI发送芯片,HDMI发送芯片将音频数据复合到视频流,并最终将音视频复合流输出到HDMI接收设备。而当系统当前输出的视频格式为VGA视频输出时,音频通道自动将音频数据发送给音频D/A芯片作数模转换,转换后得到的模拟音频信号最后输出到模拟音频接收设备。利用此方法,可以在实现HDMI数字音频输出的同时很好地兼容原有的模拟音频输出,并实现双音频流的自动选择与自由切换。The application of HDMI audio and analog audio in high-definition video surveillance system is introduced. When the video output format is HDMI, the system transfers the audio steam to HDMI transmitter chip in which the audio signal is embedded into video stream, and finally sends the composed audio and video stream to the HDMI receive devices. When the video output format is VGA, the system transfers the audio steam to audio D/A in which the digital audio is transformed into analog audio, and finally sends the transformed analog audio to audio receive devices. By this way, the system can realize HDMI digital audio output while keeps compatible with analog audio format, and it can also select and switch between the two audio formats freely.

关 键 词：双音频 高清 安防监控 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]