【正文】 system to achieve the acceptance speech, playback while using Matlab software to filter and spectrum analysis, simple voice recording function, and good quality output speech signal.System hardware circuit is simple, easy adjustment, costeffective and practical.Key words: Voice Recording and Playing System；Filter；Spectrum Analysis張學(xué)龍：基于單片機(jī)的語音錄放的軟件設(shè)計(jì)II目 錄引 言 ............................................................................................................................1第 1 章 緒論 ..................................................................................................................2 導(dǎo)言 .........................................................................................................................2 數(shù)字語音錄放系統(tǒng)的發(fā)展 .....................................................................................2第 2 章 數(shù)字錄音的基本原理 ......................................................................................3 模擬音頻和數(shù)字音頻 ..............................................................................................3 數(shù)字音頻技術(shù)的概念 ..............................................................................................3 語音信號的數(shù)字化 ..................................................................................................4 取樣 ...............................................................................................................4 量化 ...............................................................................................................5 濾波和頻譜分析 .....................................................................................................6 采樣定理 .......................................................................................................6 采樣頻率 .......................................................................................................6 語音的錄入與打開 .......................................................................................6 時(shí)域信號的 FFT 分析 ..................................................................................7 數(shù)字濾波器設(shè)計(jì)原理 .................................................................................7第 3 章 硬件系統(tǒng)的設(shè)計(jì) ..............................................................................................8 總體方案論證 ..........................................................................................................8 系統(tǒng)硬件電路設(shè)計(jì) ..................................................................................................8 器件選擇 ..................................................................................................................9 單片機(jī) AT89C52...........................................................................................9 ISD2560 語音芯片 ......................................................................................10第 4 張 系統(tǒng)軟件設(shè)計(jì) ................................................................................................13 系統(tǒng)軟件總流程圖 ...............................................................................................13 AT89C52 單片機(jī)對 ISD2560 控制的軟件設(shè)計(jì) ................................................13 錄音軟件設(shè)計(jì) .............................................................................................13 放音軟件設(shè)計(jì) .............................................................................................15 濾波和頻譜分析 ....................................................................................................18 圖形用戶界面概念 .....................................................................................18 圖形用戶界面設(shè)計(jì) .....................................................................................18 語音信號的讀入與打開 .............................................................................18 語音信號的定點(diǎn)分析 .................................................................................19致 謝 ..........................................................................................................................24參考文獻(xiàn) ......................................................................................................................25附錄 A 系統(tǒng)總電路圖 ................................................................................................26附錄 B 外文文獻(xiàn) ........................................................................................................27附錄 C 主要參考文獻(xiàn)題錄及其摘要 ........................................................................31附錄 D 主程序清單 ....................................................................................................33安徽工程大學(xué)畢業(yè)設(shè)計(jì)（論文）III插圖清單圖 21 數(shù)字錄音系統(tǒng)圖 .....................................................................................................10 圖 22 數(shù)字放音系統(tǒng)圖.......................................................................................................10圖 31 硬件系統(tǒng)框圖...........................................................................................................14圖 32 硬件總電路圖...........................................................................................................15圖 33 AT89C52 引腳圖.....................................................................................................18圖 35 ISD2560 引腳圖......................................................................................................18圖 41 軟件流程圖...............................................................................................................20圖 42 錄音軟件程序框圖...................................................................................................21圖 43 放音軟件程序框圖...................................................................................................23圖 44 語音信號引入與打開圖...........................................................................................26圖 45 語音信號定點(diǎn)分析圖...............................................................................................27圖 51 濾波和頻譜分析圖............................................................................