兰州交通大学博文学院毕业设计VIP

兰州交通大学博文学院毕业设计（论文）兰州交通大学博文学院毕业设计（论文）概 要随着社会的发展，一个安全、舒适、智能的居住环境已经成为住宅小区的标配，而在住宅小区里的可视对讲系统则是构造智能小区的重要的组成部分。可视对讲系统是一套现代化小康住宅服务措施，提供访客与住户之间双向可视通话，可以达到图像和语音双重识别从而增加安全可靠性，能够节约大量的时间，从而提高工作效率。系统把楼宇的人口、住户、小区物业管理部门三方面的通讯集中整合在一个网络里，成为防止住户受到生命及财产损失的重要安全防线，有效的保护了住户的人身及财产安全，并且提高小区的整体管理和服务水平。智能小区的主要研究内容如下：可视对讲系统主要由中心管理机、门口机、室内分机、系统电源、视频联网器、分支器等部件组成。本系统以管理中心为核心，通过联网总线和微处理器系统将整个小区有机联结起来。系统采用了独立、双向的数据传输通道，等于在小区内部建立了一个初步数字化局域网。该系统不仅具备了可视、对讲、呼叫、密码开锁还可以集成监控系统，从而保证了小区整体化的安全。 而本次论文介绍是以单片机AT89C2051为核心设计的新型无线可视对讲门铃系统。在系统中，讲述了该系统的总体结构与工作原理及具体的设计。接下来将详细讲述智能小区可视对讲系统的具体设计。关键词：智能小区 可视对讲系统 AT89C2051AbstractFirst：IntroductionMicroelectronics technology, wireless technology and network technology for the development of modern people living environment of security, facilitate the provision of a strong technical support, This presents a smart area for the safety of the new wireless doorbell system visualization Round, On the systems overall structure and working principle and the key technology full-duplex digital voice communications for the design and realization of, Analysis of the digital transmission of voice processing, a frame structure on the design and realization of the CPLD in a wireless doorbell system visualization Round-frame synchronization. Finally, the prototype system by the field test, stable performance,reliable,clear voice, has good practical value.The development of electronic, wireless and network technology provides theStrong technical support for security and convenience of modern residential quarters. In this paper, we introduce a new style wireless visual inter-conversation doorbell system, which is used in the intelligent residential quarters. Then explains the structure of this system and its full-duplex digital voice communication is designed and implemented. We emphasize the digital voice process in transmission, and discuss the design of the structure of frame, and the frame synchronization realized in CPLD. Finally, the test result shows a stable and reliable quality, clear voice and fairly practical value.Second:featuresAt present domestic doorbell has been a lot of visualization products, mainstream product is wired, one-way voice and Simulation. Visual Round wireless doorbell system combines computer technology, wireless communications and digital signal processing technology used in high-frequency wireless transmitter receiver, installation without cabling, would not undermine the effectiveness decoration. Visual Round wireless doorbell system is the next generation of electronic security systems, modern gardens, Villa, Villa ideal security device. Family in the living room, through the screen to see images, voice speaking remote understanding of the situation outside, accurate judgment visit in the capacity of the reception to decide whether to open the door to protect the familys personal and property safety. The system uses modular hybrid technology, digital voice, video simulation, the future is all-digital wireless doorbell system visualization talk of a transition, the systems main features are:(1)2.4GHz,900MHz high-frequency signal transmission.(2) In the 60 m clearly within the scope of stable transmission audio and video signals at a barrier such as distance is 30m.(3) If on the doorbell, “Ding Dong” Sound hints open automatically monitor screen(4) Wireless unlock, and control of the electric door lock control.(5) Indoor Wireless proactively monitor.(6) Delay shut down automatically monitoring system.(7) Wireless transmission, the receive can easily be placed,easy installation.(8) Wireless full-duplex voice communication.The system is composed of two part of indoor and outdoor part. Visual Round wireless doorbell system uses full-duplex digital wireless voice programmes,indoor and outdoor machines are corresponding to the four basic modules, including A/D/A module from voice codec chip MC145481 completed, the speech signal processing module from the CPLD digital voice signal as well as a package of reconciliation package synchronization, thereby enhancing anti-jamming capability. Wireless transmit/ receive modules to deal with the digital signal modulation and demodulation, it suitable for wireless channel transmission.Third: Voice transmission processing Although voice processing digital signal transmission than analog signals have great advantages, but digital signal analog signal difficult than receiving, processing requirements more stringent than the analog signal, with the development of society, wireless communication equipment widely used, resulting in increased electromagnetic interference, and advances in technology enabling wireless receiver continuously improve receiver sensitivity, wireless receiver in the corresponding sent equipment will not be there when the output data demodulation. Wireless communications must be according to date frame transmission of data packet, and must be adopted and reliable way to ensure the frame synchronization of data from the chaos of the data frame will be legitimate identified. Frame synchronization can be used in synchronous or synchronous code. Synchronization of the relatively high hardware requirements to achieve more difficult, it seldom use more than a code synchronization. Synchronization Code should ensure that the choice of code and data re-synchronization code probability as low as possible, so as to the general application of the HS. That the need for re-design code to escape if a frame set up between the timer and overtime provisions of the transfer agreement in the data frame length, frame synchronization code can be arbitrary choice, the general 0xAA 0x55, such as 0-1 uniform Distribution of data, and in order to in improve reliability, often the choice of multi-byte frame synchronization code, such as 0xAA 0xBB(2-byte frame synchronization code). To establish stable communication a standard wireless data transmission frame should include at least the following part: (1) Jumping code: in the receiving establishment phase, providing reception threshold level, its length and hardware relevant data, wireless doorbell system visualization Talk back used in the x99 is 0. (2) Redundant code: According to experience, usually adopts a 0xff or 0xff, 0x66 result were relatively good, and the establishment of communication to correct errors arsing from the phase-out-of-step serial receiver, in the show speed(19200 bps), the two often use L-redundant code is not adopted in the design. (3) Synchronous Code: used for frame synchronization data transfer and use of relatively low-bit-rate code word, and in order to improve reliability, and a 2-byte or 2 bytes above synchronous code words such as 0xaa 0xbb, Visual Round wireless doorbell system is used in the 0xCCCCCC. (4) Data: users want to transfer data to improve the reliability of communications, the proposed Manchester encoding the data or using DPCM send, and data validation. Manchester encoding or used in the DPCM transmitted, the length of the data generally should not exceed 256 bytes; on the contrary, should not exceed 64 bytes. But speaking in the wireless doorbell visual system, digital voice wireless transmitter module maximum data transmission rate of 76.8 kbps, but the voice from the A/D chip from 64 kbps data there, as affected by the CPLD antenna bandwidth capacity and launch two factors constraints, we do not have to deal with complicated coding. 0x99 precursor for which code for the initial bit synchronization and receive state machine reset, 0xCCCCCC date frame synchronization code, frame synchronization for eight yards behind-control code. Visual Round wireless doorbell system in the control code number of small , to outdoor is three, has taken the initiative to monitor the lock, removable hang up. Outdoor to indoor control signal only a call button, we will design the frame synchronization byte code for the control signal transmission in the back to keep up with the control signal in bytes of voice and data units. Software using top-down design methodology, a total of five document: the top-level documents were, transmit modules accept modules, digital phase-locked loop and frame state machine. Top-level document for the system clock with a 2048 kHz voice codes interface chip MC145481, including sending and receiving of two functional modules L module which is sent to send data in the original data before adding header, voice communications frame 0x99 first, 0xCC, 0xCC, 0xCC,followed by the control signal byte, in bytes of voice and data units for L receiver module is to detect and control the speech signal, the relatively complex, including digital phase-locked loop and frame status two-states, if detected 0xCC, 0 from the state into a state if a bytes is 0xCC from entering the two state, or else to return to state 0; If the first there bytes or 0xCC from entering the state 2 3 state into synchronous state, or to return to state 0 which DPLL is a bit synchronization. As voice signal are relatively weak in general, according to Mu/A code of law, may be even longer,”1”, so that the receiver can not extract the correct information in sync, so we carried out a simple voice and data hanging, even if “1” is greater than the number eight, an eight reverse, namely, “1” to “0”. As one of the quantitative data sampling point last a minimum weights, this will not deal with the impact of.Last: Concluding remarks Based on the visual-speaking wireless doorbell system, and its two-way voice communications for the design and realization, it is has been tested and empty distance of 60 m, 30 m to obstructions, clear voice L test results show that the design of a performance stable and reliable, voice clear, simple design, and other features, the value of L practical course of the programme in this paper on the properties have yet to be improve, then we have to do the work is thee image of real-time digital information transmission, thus achieving all-digital wireless Visualization Round doorbell system.中文译文可视对讲门铃系统中语音通信的设计与实现一、引言 微电子技术、无线技术和网络技术的发展为实现人们居住环境的安全、方便提供了有力的技术支撑，由此介绍了异种用于智能小区安全的新型的无线可视对讲门铃系统，阐述了该系统的总体结构工作原理，并对其中关键技术全双工数字语音通信进行了设计与实施，汾西路数字语音在传输中的处理，谈论了帧结构的设计，并在CPLD中实现了无线可视对讲门铃系统的帧同步，最后对所做的样机系统进行了无对所做的样机系统进行实地测试，性能稳定、可靠、语音清晰，具有很好的使用价值。电子贸易的发展，无线和网络技术为安全性与方便性的现代住宅小区提供了强有力的技术支撑。在这篇文章中，我们引入一个新的作风，无线视觉跨交谈门铃系统，它可以用来在智能化小区住宅。然后解释了结构这个制度，它的全部全双工数字语音通信的设计与实施。我们强调在传送数字化语音过程中，并谈论了结构设计的框架，以及帧同步实现的CPLD。最后，测试结果发明，一个稳定和可靠的质量，清晰的语音和相当的实用价值。随着微电子技术，无线技术和网络技术的飞速发展，人们对于居住环境的安全、方便提出了越来越高的要求，因此智能化小区随之出现随着改革开放的深入和市场经济的迅速发展，城市流动人口大量增加，带来诸多不安定因素，可视门铃等安全防范装置得到了广泛应用。目前国内已经有很多可视门铃的产品主流产品是有线方式，单向语音模拟。无线可视对讲门铃系统结合微机技术、无线通信技术和数字信号处理技术，采用在高频段无线发送接收，安装时无需布线，不会破坏装修效果。本文主要针对无线可视对讲系统中的关键技术语音通信进行设计和实现。二、功能特点无线可视对