【正文】 式，它也是數(shù)字語音處理技術(shù)中常用的一種方式。 實現(xiàn)數(shù)字錄音系統(tǒng)可以采用 PC機實現(xiàn)和嵌入式系統(tǒng)實現(xiàn)兩種方式。而 嵌入式系統(tǒng)的體積小，供電方便，造價低，穩(wěn)定性也高，所以得到了廣泛的應(yīng)用。它采用錄音的原理，錄音時，單片機的 CPU將語音信號轉(zhuǎn)換為數(shù)字信號在存儲器中。 關(guān)鍵詞 ： 語音，數(shù)字，單片機 2 Abstract With the growth of the development of the economy,the need for sound Record in the department of Gongan and Railway are is much Useful for the advance in the munication between the people and the machine ,and for the reducing of the mistake of the disposal in the system of industrial surveillance,the system of the The digital recording system as one of a kind frequently used in some of the DAIJI prison system in the dialogue at an appropriate time to voice realtime reporting system and the work of state and other tips. Digital recording system is the scene of the voice analog signal into a discrete digital signal and then stored in a storage medium on a recording, it is also digital voice processing technologies used in a way. Use of digital recording technology, efficiency and a higher degree of automation, recording a long time, and the information stored in longterm storage medium, while the voice information edited by the very convenient and fast to find. Digital recording system can be used to achieve a PC and embedded systems in two ways. Wh en using a PC when, because of its size, power consumption, high cost, and in some cases, system stability can not be guaranteed so using a PC to achieve the aforementioned functions and operation, Subject to certain restrictions. The small size of the embedded systems, power supply convenience, low cost, high stability, has been widely used. This paper presents a MCU with embedded digital recording system, which As a digital recording module that can be packaged in a second development above. It uses the principles of sound recording, sound recording, the MCU CPU will voice signal into a digital signal in memory. The players, both can play audio files, can also play early in the memory of the audio files 3 目 錄 1 緒論 ........................................................................................................................................ 5 題目背 景 .......................................................................................................................... 5 語音留言系統(tǒng)的發(fā)展現(xiàn)狀 展望 ..................................................................................... 6 語音留言系統(tǒng)的應(yīng)用 ...................................................................................................... 7 本文結(jié)構(gòu) .......................................................................................................................... 7 2 硬件 總體 設(shè)計 ......................................................................................................................... 2 系統(tǒng)描述 ......................................................................................................................... 8 系統(tǒng) 的 元件選擇 .............................................................................................................. 9 系統(tǒng)功能分析 .................................................................................................................. 9 各部分電路的設(shè)計 ........................................................................................................ 14 振鈴電路 ............................................................................................................... 14 摘機掛機電路和 DTFM 雙音多頻解碼集成電路 ................................................. 14 電話筒檢測電路 ................................................................................................... 14 4*4 鍵盤電路 ........................................................................................................ 14 錄放音主電路 ....................................................................................................... 14 3 軟件設(shè)計 ............................................................................................................................. 22 3． 1 錄音程序設(shè)計 ............................................................................................................. 22 3． 2 放音程序設(shè)計 ............................................................................................................. 24 4 系統(tǒng)的拓展 ........................................................................................................................... 27 儲存時間的 拓展 ............................................................................................................ 27 ISD4004 清晰化和立體聲語音系統(tǒng)擴展 ...................