本文關(guān)鍵詞：新型數(shù)字可視對講系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 智能家居 可視對講 GM8126 實(shí)時(shí)流傳輸協(xié)議 安卓

【摘要】：摘要：樓宇可視對講系統(tǒng)是智能家居系統(tǒng)的重要組成部分,它不僅給人們的生活帶來了便利,更有利于提高小區(qū)安防水平。 為了克服現(xiàn)有模擬可視對講系統(tǒng)中布線復(fù)雜、信號抗干擾性差和現(xiàn)有數(shù)字可視對講系統(tǒng)結(jié)構(gòu)復(fù)雜、開發(fā)難度大的缺點(diǎn),采用模塊化設(shè)計(jì)思路和多線程設(shè)計(jì)技術(shù),設(shè)計(jì)并實(shí)現(xiàn)了一種新型數(shù)字可視對講系統(tǒng),完成了門口機(jī)硬件、軟件、室內(nèi)機(jī)軟件設(shè)計(jì)。此系統(tǒng)的門口機(jī)采用高集成度芯片GM8126作為主控芯片,簡化了系統(tǒng)結(jié)構(gòu)。門口機(jī)采用Linux內(nèi)核嵌入式操作系統(tǒng),室內(nèi)機(jī)采用Android智能手機(jī),提高了智能性和便捷性。 系統(tǒng)以8kHz采樣率、16bit量化編碼精度、單聲道方式采集語音數(shù)據(jù),使用適合網(wǎng)絡(luò)傳輸且性能良好的開源Speex庫對語音數(shù)據(jù)編解碼,實(shí)現(xiàn)了語音的雙向傳輸。門口機(jī)以30fpps的采樣幀率采集320×240分辨率的視頻,并以H.264格式壓縮視頻,單向傳輸至室內(nèi)機(jī),室內(nèi)機(jī)采用開源免費(fèi)跨平臺的視頻和語音流方案FFmpeg庫實(shí)現(xiàn)對視頻數(shù)據(jù)進(jìn)行解碼。將開源項(xiàng)目Live555修改后移植到Linux系統(tǒng)和Android系統(tǒng)中,實(shí)現(xiàn)了語音、視頻和命令數(shù)據(jù)的RTSP協(xié)議傳輸。 系統(tǒng)經(jīng)過整體調(diào)試,對調(diào)試中出現(xiàn)的回聲問題和音視頻同步問題進(jìn)行了處理。系統(tǒng)經(jīng)測試顯示圖像、語音質(zhì)量已達(dá)到可視對講設(shè)計(jì)要求,系統(tǒng)設(shè)計(jì)方案可行,具有一定的參考價(jià)值和實(shí)際意義。
[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.

【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN949.28;TU855

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