【正文】 一段CLR CLR CALL SOUNDAJMP SHOW1JMP PBACKPNEX1: CJNE A,2,PNEX2MOV P1,20H 。送字段 4 起始地址 CLR CLR LCALL RECORD JMP BACK NEXT4: CJNE R7,5,BACK MOV R7,00H MOV P1,80H 。本系統(tǒng)采用單片機(jī)來(lái)控制，不需讀出信息地址，而直接設(shè)置信息段起始地址。如果 CE 一直為低，或芯片工作在某些操作模式，放音則會(huì)忽略 EOM 而繼續(xù)進(jìn)行下去，直到發(fā)生溢出為止。圖 35 所示是其引腳排列。2568字 節(jié) 內(nèi) 部 RAM該單片機(jī)的 P1 口是一個(gè)雙向 I/O 口，其中 ~ 口內(nèi)部提供了上拉電阻，、 需外部上拉。 在MATLAB的信號(hào)處理工具箱中函數(shù)FFT和IFFT用于快速傅立葉變換和逆變換。因此在聽(tīng)感上與白噪聲不同，是一種較粗糙的、刺耳的、稱為顆粒性噪聲的聲音。由取樣定理知道，如果取樣頻率能滿足這個(gè)定理，就會(huì)完全恢復(fù)原波形，但要真正完全恢復(fù)原波形，則需要無(wú)窮多位數(shù)。 取樣（1）取樣定理模擬聲頻信號(hào)可用幅度對(duì)時(shí)間的關(guān)系來(lái)表示，將模擬信號(hào)的幅度以一定的時(shí)間間隔取得樣值，稱為取樣(或采樣、抽樣)。 數(shù)字音頻技術(shù)的概念模擬量是指在時(shí)間上和幅度上都是連續(xù)的量，聲波就是聲壓幅度隨時(shí)間連續(xù)變化的模擬量，它由傳聲器轉(zhuǎn)換成聲頻信號(hào)后，也是時(shí)間和電壓幅度都連續(xù)變化的模擬信號(hào)。舉例來(lái)說(shuō)，原始語(yǔ)音一般都是采用 8KHz 抽樣，16bits 的線性 PCM 編碼進(jìn)行采集，在一般的系統(tǒng)中就直接將采集后的數(shù)據(jù)進(jìn)行存儲(chǔ)；而如果采用參數(shù)編碼對(duì)采集后的數(shù)據(jù)進(jìn)行壓縮，存儲(chǔ)量則可以大大減少，當(dāng)需要恢復(fù)語(yǔ)音時(shí)，可利用編碼后的參數(shù)進(jìn)行合成，可以得到質(zhì)量令人滿意的結(jié)果。關(guān)鍵詞：語(yǔ)音錄放系統(tǒng)；濾波；頻譜分析Software Design of Voicerecording and Playing Based on MicrocontrollerAbstract At present, speech synthesis, speech recognition, voice storage and playback technology is more widely applied, despite the use of general monitoring and control system in the SCM have the hardware circuit (such as the A / D, D / A, memory, etc.) can be pleted Voice of the digital signal processing, but a single function of parison, and the effect is not very good. In this paper, with the voice chip ISD2560 AT89C52 microcontroller consisting of voice storage 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目 錄引 言 ............................................................................................................................1第 1 章 緒論 ..................................................................................................................2 導(dǎo)言 .........................................................................................................................2 數(shù)字語(yǔ)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(yǔ)音信號(hào)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(yǔ)音的錄入與打開(kāi) .......................................................................................6 時(shí)域信號(hào)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(yǔ)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(duì) 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(yǔ)音信號(hào)的讀入與打開(kāi) .............................................................................18 語(yǔ)音信號(hào)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 ...................................................................................