新型数字可视对讲系统的设计与实现

发布时间：2018-01-12 14:33

本文关键词：新型数字可视对讲系统的设计与实现　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：楼宇可视对讲系统是智能家居系统的重要组成部分,它不仅给人们的生活带来了便利,更有利于提高小区安防水平。为了克服现有模拟可视对讲系统中布线复杂、信号抗干扰性差和现有数字可视对讲系统结构复杂、开发难度大的缺点,采用模块化设计思路和多线程设计技术,设计并实现了一种新型数字可视对讲系统,完成了门口机硬件、软件、室内机软件设计。此系统的门口机采用高集成度芯片GM8126作为主控芯片,简化了系统结构。门口机采用Linux内核嵌入式操作系统,室内机采用Android智能手机,提高了智能性和便捷性。系统以8kHz采样率、16bit量化编码精度、单声道方式采集语音数据,使用适合网络传输且性能良好的开源Speex库对语音数据编解码,实现了语音的双向传输。门口机以30fpps的采样帧率采集320×240分辨率的视频,并以H.264格式压缩视频,单向传输至室内机,室内机采用开源免费跨平台的视频和语音流方案FFmpeg库实现对视频数据进行解码。将开源项目Live555修改后移植到Linux系统和Android系统中,实现了语音、视频和命令数据的RTSP协议传输。系统经过整体调试,对调试中出现的回声问题和音视频同步问题进行了处理。系统经测试显示图像、语音质量已达到可视对讲设计要求,系统设计方案可行,具有一定的参考价值和实际意义。
[Abstract]:Abstract: the building visual intercom system is an important part of the smart home system. It not only brings convenience to people's life, but also helps to improve the level of residential security.
In order to overcome the shortcomings of analog video intercom system in signal wiring complexity, poor anti-interference and existing digital video intercom system with complicated structure, difficult to develop the shortcomings of using modular design and multi thread programming technology, design and implementation of a new type of digital video system, complete the door hardware, software, indoor software design of this system. The door machine using high integrated chip GM8126 as the main control chip, the system structure is simplified. The door machine adopts Linux embedded operating system, the indoor machine adopts Android intelligent mobile phone, high intelligent and convenient.
The system with 8kHz sampling rate, 16bit quantization encoding speech data acquisition accuracy, single channel mode, suitable for network transmission and good performance of the open source Speex library for voice data decoding, realizes the bidirectional transmission of voice. The door machine to 30fpps sampling collection of 320 x 240 resolution video and H.264 format video compression, one-way transmission to the indoor machine, indoor machine adopts the free open source cross platform video and voice to achieve the decoding of the video data flow scheme FFmpeg library. The open source project Live555 modify transplanted to Linux system and Android system, realize the voice, video and data transmission protocol RTSP command.
After debugging the whole system, we deal with the echo problems and audio and video synchronization problems in debugging. The system shows that the quality of speech and video has reached the design requirements of visible talkback. The system design is feasible, and has certain reference value and practical significance.

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN949.28;TU855

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