网络化可视对讲系统设计与实现

发布时间：2018-04-12 19:19

本文选题：可视对讲 + 以太网供电　；参考：《湖南大学》2015年硕士论文

【摘要】：随着经济的发展和人们生活水平的提高,人们对生活质量提出了更高的要求,这表现在很多方面。本文针对楼宇对讲系统存在的诸多问题,提出了基于局域网的全数字楼宇可视对讲系统的解决方案,力争能够解决现存的一些问题,帮助提高用户体验。系统选用三星Exynos4412作为核心芯片,Exynos4412是一款四核32位的高性能芯片,其高速运算能力有利于后期软件功能的扩展,Exynos4412具有1080@30fps高清硬件编解码能力,这是实现高质量音视频通话的前提,系统采用网络传输音视频数据,有效地避免了以往模拟系统中存在的稳定性差、抗干扰能力差、传输距离有限等缺陷,为高质量音视频通话提供了可靠的保障。同时基于局域网的设计为以后与智能小区系统的融合提供了很好的兼容性。针对传统楼宇对讲系统中存在的布线复杂问题,本文创新性地提出了将在监控领域应用较多的POE供电技术应用到楼宇对讲系统中来,采用网线对楼宇对讲的室内机和门口机进行供电,从而免去了电源线的布线工作,在一定程度上降低了布线难度。系统音视频通话的软件实现利用了开源的VOIP库liblinphone,liblinphone具有方便易用的软件接口,在很大程度上降低了软件开发的难度,加快了项目研发进度。Linphone自带的回声消除算法在楼宇可视对讲中也有着重要的意义,免去了单独研究回声消除算法的工作量。针对老旧楼盘的数字化升级以及一些不方便布线的情形,本系统引入了无线组网方式,解放了室内机,当室内机采用电池供电时,可以在室内任意摆放,而不是像传统对讲系统一样固定在门口。采用USB接口的无线网卡,方便在不同组网情况下进行硬件裁剪。经过测试和调试,最终实现了对讲系统的预期功能,完成了最初制定的设计目标。
[Abstract]:With the development of economy and the improvement of people's living standard, people demand higher quality of life, which is manifested in many aspects.In view of many problems in building intercom system, this paper puts forward a solution of all digital building visual intercom system based on LAN, which can solve some existing problems and help improve the user experience.The system chooses Samsung Exynos4412 as its core chip, Exynos4412 is a high performance four-core 32-bit chip. Its high-speed computing capability is conducive to the extension of software function in the later period. Exynos 4412 has the capability of 1080@30fps high-definition hardware coding and decoding, which is the premise of realizing high-quality audio and video communication.The system uses the network to transmit audio and video data, which effectively avoids the shortcomings of poor stability, poor anti-interference ability and limited transmission distance in the previous analog system, which provides a reliable guarantee for high-quality audio and video communication.At the same time, the design based on LAN provides good compatibility with intelligent community system.In view of the complex problem of wiring in the traditional building intercom system, this paper proposes to apply the POE power supply technology, which is widely used in the field of monitoring and control, to the building intercom system.The power supply of the intercom indoor unit and the door machine is carried out by using the network wire, thus eliminating the wiring work of the power cord and reducing the difficulty of the wiring to a certain extent.The software implementation of audio and video communication in the system makes use of the open source VOIP library, liblinphone, which has a convenient and easy-to-use software interface, which greatly reduces the difficulty of software development.The research and development of the project has been speeded up. The echo cancellation algorithm with Linphone is also of great significance in building visual intercom, which eliminates the workload of studying the echo cancellation algorithm alone.In view of the digital upgrading of old buildings and some inconvenient cabling, the system introduces wireless networking mode, freeing indoor machines, when the indoor units are powered by batteries, they can be placed at any time in the room.Instead of being fixed at the door like a traditional intercom system.The wireless network card with USB interface is convenient for hardware clipping under different networking conditions.After testing and debugging, the expected function of the intercom system was finally realized, and the original design goal was completed.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU855

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