【正文】 ............................................... 10 MT8880 的譯碼 ................................................................................................... 10 語音芯片 ISD4004 ........................................................................................................ 11 ISD4004 功能概述 ............................................................................................... 11 ISD4004 引腳及其功能描述 ................................................................................. 12 ISD 的 SPI ........................................................................................................... 13 信息快進(jìn) ......................................................................................................... 14 上電順序 ......................................................................................................... 14 SPI 端口的控制位 ............................................................................................. 15 SPI 控制寄存器 ................................................................................................. 15 繼電器 ......................................................................................................................... 16 繼電器的介紹 ..................................................................................................... 16 繼電器的驅(qū)動原理 .............................................................................................. 17 第 3 章 硬件電路 ...................................................................................................................... 18 振鈴檢測電路 .............................................................................................................. 18 自動摘機(jī)電路 .............................................................................................................. 19 DTMF 信號處理電路 ..................................................................................................... 21 語音接口電路 .............................................................................................................. 22 單片機(jī)電路 .................................................................................................................. 23 第 4 章 軟件設(shè)計 ...................................................................................................................... 24 系統(tǒng)軟件流程圖 ........................................................................................................... 24 程序代碼 ..................................................................................................................... 24 第 5 章 結(jié)束語與展望 ............................................................................................................... 25 第 6 章 鳴謝 ............................................................................................................................. 26 目錄 2 參考文獻(xiàn) ................................................................................................................................... 27 附錄Ⅰ：單片機(jī)控制電路 .......................................................................................................... 28 附錄Ⅱ：摘機(jī)解碼電路 .............................................................................................................. 29 附錄Ⅲ：語音芯片電路 .............................................................................................................. 30 附錄Ⅳ：程序代碼 ..................................................................................................................... 31 附錄Ⅴ：實物圖 ........................................................................................................................ 40 設(shè)計總說明 I 設(shè)計總說明 隨著 我國 社會經(jīng)濟(jì)和通信行業(yè)的迅速發(fā)展，電話已成為人們?nèi)粘Ｉ詈凸ぷ髦蟹浅Ｖ匾?的聯(lián)絡(luò)手段，以前需要見面或書信才能解決的事情現(xiàn)在只需一個電話就辦妥了。但這種方便快捷同時也帶來了一個弊病，那就是有些事情事后說不清，容易造成不必要的麻煩，有些單位只得以電話錄音機(jī)來暫時解決這個問題，此類設(shè)備自動化程度差，存儲量小，查詢不便，而且需要每條線路都配備一個相應(yīng)設(shè)備，成本高，效率低。電話自 動錄音系統(tǒng)的發(fā)明給人們帶來極大的方便。 當(dāng)主人不在家時，對方在語音的提示下聽取留言或留下一段信息。該電話自動錄音系統(tǒng)便是其中典型的一種。 本文首先探討了 數(shù)字錄音系統(tǒng)的概況 ，并根據(jù)現(xiàn)有的技術(shù)條件，利用單片機(jī)和一些外圍器件設(shè)計一種適合家庭 、 辦公室等室內(nèi)場 合的智能電話錄音系統(tǒng)。當(dāng)有電話打入時即電話振鈴檢測電話檢測到電話線路發(fā)來的振鈴 (鈴流 )并等待至系統(tǒng)默認(rèn)的振鈴次數(shù)后 ,控制器自動摘機(jī) ,摘機(jī)后 在語音電路的提示下 將主人留言發(fā)送給對方 ,最后錄入對方語音 ,直到檢測到對方掛機(jī)為止，完成錄音電話的功能 。根據(jù)系統(tǒng)的功能主要分為這幾部分：振鈴檢測部分；自動摘掛機(jī)部分； DTMF 信號解碼部分；語音 控制與語音錄放 部分 。 關(guān)鍵詞： DTMF 解碼電路；語音芯片 ISD4004；智能電話錄音系統(tǒng)INTRODUCTION II INTRODUCTION With the development of China39。s daily life and work. For example, things which are solved by meeting or munication with letter in the past is solved just by a phone now. However, this convenience also has a drawback. It is difficult to explain some things after the call and causes some troubles. In order to solve the problem, some people have to use a telephone tape to record the conversation. This equipment is not only poor intelligent and small memory, but also inconvenient in inquiring. Every line needs to equip with a telephone tape. It makes the equipment with high cost and low efficiency. It need to record the plete conversation in some special situation such as scheduling electric power, police’s monitoring activity and alarm for flood. With progress of social technology and demand for reliable monitoring voice, old recording equipment has to face powerful challenge of the social adaptability. The invention of telephone automatic recording system brings great convenience for people. In daily life, when the master is away, this system can fulfill the obligations of the owner to record the message from other side that is known if the master is back. When the master is not at home, the people who made a phone call leave a message or information with the speech cues. People have generally adopted integrated circuit storage products instead of cassette tape. This telephone automatic recording system is one of the typical types. With the development of science and t