論文標(biāo)準(zhǔn)WORD格式排版 32頁

摘 要
隨著公安、鐵路等部門對語音記錄的需求不斷增長，出現(xiàn)了許多聲音處理的產(chǎn)品。而數(shù)字錄音系統(tǒng)作為其中的一種，經(jīng)常用于某些監(jiān)控對話系統(tǒng)中，在適當(dāng)?shù)臅r候用語音實時報告系統(tǒng)的工作狀態(tài)和提示信號等。
本文介紹了一種用單片機(jī)實現(xiàn)的嵌入式數(shù)字錄音系統(tǒng)，該系統(tǒng)為一個數(shù)字錄音模塊，可以將其封裝在上面進(jìn)行二次開發(fā)。它采用數(shù)字錄音的原理，錄音時，單片機(jī)的CPU將語音信號轉(zhuǎn)換為數(shù)字信號，存儲存儲器中。播放的時候，既可以播放錄音文件，也可以播放提前存入存儲器中的語音文件。本文首先介紹了實現(xiàn)嵌入式錄音的幾種技術(shù)，然后介紹了數(shù)字錄音的原理，在這之后進(jìn)行了系統(tǒng)的總體結(jié)構(gòu)設(shè)計和詳細(xì)的軟硬件設(shè)計，給出了系統(tǒng)調(diào)試過程和實驗結(jié)果。最后，對系統(tǒng)的應(yīng)用前景進(jìn)行了分析并提出了改進(jìn)設(shè)想。
從實驗結(jié)果來看，本論文所設(shè)計的嵌入式數(shù)字錄音系統(tǒng)穩(wěn)定性較好。當(dāng)然要真正做到商業(yè)化還需要做很多的改進(jìn)工作，但它對許多要求錄放的場合是十分有用的。

關(guān)鍵詞: 嵌入式系統(tǒng)；數(shù)字錄音；Flash Memory


ABSTRACT

With the growth of the need for sound record in the department of Gongan and Railway, many products for sound disposal have appeared. As one sort of the products, digital recording system is mainly used in the systems of industrial watch and automatic responsion, reporting timely the State of working and warning information, prompt information and explanation.
The paper has devised the embedded system of digital recording on the basis of the principle of digital recording. When recording, the microcontroller will convert the analog signals into the digital signals and then store the digital signals in the Flash Memory. While playing the sound, the recording file or the .wav file can be both played. The paper firstly introduces several ways of designing the system，then the principle of digital recording, and then the main architecture of the system and the devising of the hardware and software. At last the future of the system and some thinking of promoting is provided.
The embedded system of digital recording is proved to be stable after the test of it. Obviously the system has to be promoted before its commercialization，yet it is useful highly for the situation needing recording

Keywords: the embedded system；digital recording；Flash Memory

目 錄

摘要 I
ABSTRACT II
第1章 緒 論 1
1.1論文背景 1
1 .2 當(dāng)前嵌入式錄音系統(tǒng)實現(xiàn)的方案 2
1.2.1語音芯片的采用 2
1.2.2 DSP芯片的采用 3
1.3 本論文的任務(wù) 4
第2章 數(shù)字錄音的基本原理 6
2.1模擬聲頻和數(shù)字聲頻 6
2.2數(shù)字音頻技術(shù)的概念 6
2.3語音信號的數(shù)字化 8
2.3.1取樣 8
2.3.2量化 9
2.3.3編碼 10
2.4數(shù)字信號的檢錯、糾錯及模擬信號的恢復(fù) 10
2.4.1數(shù)字信號的檢錯和糾錯 10
2.4.2模擬信號的恢復(fù) 11
第三章 系統(tǒng)的硬件設(shè)計 12
3.1系統(tǒng)的硬件總體設(shè)計 12
3.2 C8051F020的簡介 14
3.2.1 微處理器 14
3.2.2 C8051F020的資源和特性 16
3.3 Flash Memory 17
3.4 輸入放大電路和輸出電路的設(shè)計 18
第四章 系統(tǒng)的軟件設(shè)計 20
4.1 軟件的總體設(shè)計 20
4.2 單片機(jī)控制程序 22
4.2.1 文件傳送子程序 22
4.2.2 錄音程序 23
4.2.3 放音程序 24
第五章 總結(jié) 26
參考文獻(xiàn) 27
致謝 28