【正文】 rts Group) Audio Layer3 的簡稱，是 MPEG1 的衍生編碼方案， 1993 年由德國 Fraunhofer IIS研究院和湯姆生公司合作發(fā)展成功。 低碼率對信息的高效存儲和傳輸有重要意義。 關(guān)鍵詞： STM32F107, MP3, Keil, Ride, 嵌入式，編碼，解碼華東師范大學(xué)信息學(xué)院 計算機科學(xué)技術(shù) 2020 年學(xué)士畢業(yè)論文 II Abstract With the rapid development of munication technology, we have high demands on information storage and transmission. So the shortage of resource bees an important problem. The encoding of information bees an urgent problem. Low bit rate encoding is very important for transmission and storage of information. Audio multimedia is increasingly widespread. As embedded system application requirements and cost factores in the system, embedded system resources, including hardware and software resource are very streamlined and efficient. Therefore, the underlying API function through the processor to achieve a specific key for a particular algorithm program restructuring and optimization for low power embedded systems to provide high efficiency in the implementation code a good solution. Our Mp3 decoder is based on STM32. The program piled using Ride7 cross piler development platform for development. And experiments are runing on Keil. To achieve the ultimate simulation platform based on STM32F107 the MP3 codec implementation. Key Words: STM32F107, MP3, Keil, Ride, Embed System, Coding, Decodeing. 畢業(yè)論文 1 第一章 引 言 研究背景 通信技術(shù)隨著科技的發(fā)展 ,人們對信息傳送和存儲的要求越來越高 , 從而使得這方面的資源愈發(fā)緊張 ,所以如何高效的編碼信源成了一個日益迫切的問題。程序編譯利用 Ride7 交叉編譯開發(fā)平臺進行開發(fā)。因此通過底層 API 函數(shù)實現(xiàn)針對特定處理器的特定關(guān)鍵算法進行程序結(jié)構(gòu)重組和優(yōu)化，為嵌入式系統(tǒng)低功耗高代碼執(zhí)行效率提供一種很好的解決方案。 音頻多媒體應(yīng)用也越來越廣泛。對于語音信號而言 , 碼率越高，被壓縮的比例越小，音質(zhì)損失越小，與音源的音質(zhì)越接近。 mp3 解碼器畢業(yè)論文 I mp3 解碼器畢業(yè)論文 基于 STM32 的低碼率 MP3 解碼器設(shè)計與實現(xiàn) 專 業(yè)： 計算機科學(xué)技術(shù) mp3 解碼器畢業(yè)論文 II 目 錄 摘 要 .................................................................................................................... I Abstract II 第一章 引 言 ................................................................................................................1 研究背景 ............................................................................................................1 音頻編解碼的廣泛應(yīng)用與價值 .............................................................................2 本文的組織結(jié)構(gòu) ..................................................................................................2 第二章 MP3簡介 ............................................................................................................3 MP3的原理 ..........................................................................................................3 Mp3發(fā)展歷程 ......................................................................................................3 MP3特點 .............................................................................................................5 MP3的音頻質(zhì)量 ...................................................................................................5 MP3音頻編碼 ............................................................................................7 MP3音頻解碼 ............................................................................................8 MP3 的利弊 ...................................................................................................... 10 小結(jié) ................................................................................................................. 10 第三章 STM32 簡介 ..................................................................................................... 11 STM32系列簡介 ................................................................................................. 11 STM32F107 簡介 ................................................................................................. 12 芯片功能 ................................................................................................ 12 板載功能 ................................................................................................ 13 STM32的主要優(yōu)勢 ............................................................................................. 13 小結(jié) ................................................................................................................. 15 第四章 Mp3 編解碼架構(gòu) .............................................................................................. 16 MP3 解碼器流程 ............................................................................................... 16 播放的 wav 文件 ............................................................................................... 17 MP3 文件回放 ................................................................................................... 17 ID3V1 Tag ........................................................................................................ 19 Draw Display amp。 Get touch................................................................................... 19 Flying Text ........................................................................................................ 19 小結(jié) ................................................................................................................. 19 第五章 軟件 移植 ......................................................................................................... 20 實驗概要 .......................................................................................................... 20 實驗平臺