本文關(guān)鍵詞： HDMI S3C2440 LCD控制器 TMDS AD9889B　出處：《山東大學(xué)》2012年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著高清數(shù)字電視的逐漸普及,傳統(tǒng)模擬音視頻接口已無(wú)法滿(mǎn)足如此巨大的數(shù)據(jù)傳輸量,同時(shí),數(shù)字顯示設(shè)備使用模擬接口時(shí)需要經(jīng)過(guò)D/A轉(zhuǎn)換和A/D轉(zhuǎn)換兩次操作,這些因素都會(huì)降低圖像質(zhì)量。而HDMI接口采用了TMDS最小化傳輸差分信號(hào)方式,其獨(dú)特的編碼方式和傳輸時(shí)序允許傳送不經(jīng)過(guò)壓縮的全數(shù)字高清視頻信號(hào),同時(shí)包括多聲道音頻和多種控制數(shù)據(jù),有效克服了傳統(tǒng)模擬顯示的缺陷。因此,HDMI接口設(shè)備的研制具有十分重要的實(shí)用意義。 本文首先綜合比較了幾種常見(jiàn)的模擬和數(shù)據(jù)音視頻接口的特點(diǎn),簡(jiǎn)要總結(jié)了HDMI接口的發(fā)展現(xiàn)狀,明確了HDMI接口設(shè)備的研究意義和功能定位；在深入研究HDMI規(guī)范的基礎(chǔ)上,總結(jié)了HDMI的性能特點(diǎn),對(duì)其采用的TMDS信號(hào)傳輸原理、HDMI信號(hào)操作模式和編解碼方法做了詳細(xì)的介紹,并簡(jiǎn)要介紹了HDMI接口支持的視頻信號(hào)類(lèi)型以及HDCP認(rèn)證加密等特性。 結(jié)合HDMI接口設(shè)備的功能要求,本文采用基于ARM920T內(nèi)核的S3C2440微處理器作為主控芯片,S3C2440通過(guò)ⅡC接口控制HDMI發(fā)送控制芯片AD9889B的工作方式,并將LCD控制器的輸出接口與AD9889B的視頻輸入捕捉模塊相連；為了增強(qiáng)HDMI接口的防靜電和抗干擾能力,提高高頻信號(hào)的完整性,AD9889B與HDMI端口之間充分考慮了電路板走線規(guī)則并加入了CM2020保護(hù)芯片。 本文根據(jù)HDMI接口的硬件結(jié)構(gòu),提出了完善的軟件設(shè)計(jì)方法。當(dāng)S3C2440視頻源初始化完成并確認(rèn)顯示設(shè)備已正常連接后,AD9889B完成上電初始化和EDID信息讀取操作,并配置視頻的輸入輸出模式,此后S3C2440由NAND Flash獲取測(cè)試圖像并通過(guò)LCD控制器轉(zhuǎn)化為標(biāo)準(zhǔn)視頻格式,AD9889B自動(dòng)捕捉到視頻信息后將其轉(zhuǎn)化為HDMI視頻信號(hào),并經(jīng)過(guò)HDCP加密后送至數(shù)字顯示設(shè)備上顯示。 為驗(yàn)證HDMI接口的性能參數(shù),本文做了大量的測(cè)試工作。本文最后對(duì)課題完成的工作進(jìn)行了總結(jié),并對(duì)系統(tǒng)有待改進(jìn)之處進(jìn)行了介紹。
[Abstract]:With the increasing popularity of high-definition digital television, the traditional analog audio and video interface can not meet such a huge amount of data transmission at the same time. When digital display devices use analog interfaces, they have to go through two operations: D- A conversion and A- / D conversion. These factors will reduce the image quality, while the HDMI interface uses TMDS minimization to transmit differential signals. Its unique coding method and transmission timing allow the transmission of uncompressed full-digital high-definition video signal, including multi-channel audio and multiple control data, effectively overcome the shortcomings of traditional analog display. The development of HDMI interface equipment is of great practical significance. In this paper, the characteristics of several common analog and data audio / video interfaces are compared, and the development status of HDMI interface is summarized briefly. The research significance and function orientation of HDMI interface devices are clarified. On the basis of in-depth study of HDMI specification, the performance characteristics of HDMI are summarized, and the principle of TMDS signal transmission and the coding and decoding methods are introduced in detail. The video signal type supported by HDMI interface and the features of HDCP authentication and encryption are briefly introduced. According to the functional requirements of HDMI interface equipment, the S3C2440 microprocessor based on ARM920T kernel is used as the main control chip in this paper. S3C2440 controls the working mode of HDMI transmitter and control chip AD9889B through the 鈪，

本文編號(hào)：1468132