【正文】 ），這是 MP3 解碼器的時(shí)鐘控制函數(shù)，根據(jù) MPVER 和 MPFS1： 0的獲取 MPEG 的標(biāo)準(zhǔn)類(lèi)型和采樣率，然后根據(jù)標(biāo)準(zhǔn)類(lèi)型和采樣率對(duì)解碼是時(shí)鐘進(jìn)行設(shè)置。 MP3_AncData_Contr（），對(duì) MP3 文件中的附加數(shù)據(jù)進(jìn)行處理，在本系統(tǒng)中無(wú)處理。 音頻控制 部分 在音頻處理部分中有以下函數(shù)： Audio_Reg_ Init（）：這是 MP3 音頻部分的初始化函數(shù)，用于初始化音頻控制器的寄存器控制信號(hào)； Audio_ Clk_Set（）：用于設(shè)置音頻部分的時(shí)鐘信號(hào)，在下面的例子中假設(shè)外部提供的 PLL 時(shí)鐘是 24M； Audio_ Data_ Input（）：根據(jù)外部的啟動(dòng)信號(hào)來(lái)控制對(duì)數(shù)據(jù)的獲取和音頻信號(hào)的輸出。本文討論便攜式 MP3 播放器的結(jié)構(gòu)、多種存儲(chǔ)器類(lèi)型、各種通信接口及其擴(kuò)展功能。 以基于 AT89C51SND1 芯片的 MP3 播放器為例，實(shí)現(xiàn)一個(gè) MP3 播放器的功能。我以后還要在 MP3 播放器方面進(jìn)行進(jìn)一步的研究。 導(dǎo)師在學(xué)術(shù)上孜孜不倦、嚴(yán)謹(jǐn)求實(shí)，在我的學(xué)習(xí)過(guò)程中，這種精神時(shí)刻影響和激勵(lì)著 遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) 第 20 頁(yè) 20 我。 非常感謝我的學(xué)友和朋友們的支持與鼓勵(lì) ！ 參考文獻(xiàn) [1] 李軍 ． 51 系列單片機(jī)高級(jí)開(kāi)發(fā)指南 [M]． 北京：北京航空航天大學(xué)出版社， 2021， 287304． [2] 楊心懷 ， 周潔 ． 便攜 MP3 播放器的設(shè)計(jì) [J]． 電子技術(shù)的應(yīng)用， 2021（ 2）： 5557． . [3] 李華主編 ． MCS51 系列單片機(jī)實(shí)用接口技術(shù) [M]． 北京：北京航空航天大學(xué)出版社，1996,103112． [4] 尹羅生 ,吉吟東 ,孫新亞 ,朱善尹 ． 一種 USB外設(shè)的實(shí)現(xiàn)方法 [J]． 工程計(jì)算機(jī) 2021,2226． [5] 譚浩強(qiáng) ． C 程序設(shè)計(jì) [M]．北 京：清華大學(xué) 出版社 ， 2021,911． [6] 羅亞菲 ． 凌陽(yáng)十六位單片機(jī)應(yīng)用基礎(chǔ) [M]． 北京：北京航空航天大學(xué)出版社， 2021， 遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) 第 21 頁(yè) 21 98102． [7] 劉守義等．單片機(jī)技術(shù)基礎(chǔ) [M]． 西安： 西安電子科技大學(xué)出版社， 2021， 121125． [8] 陳堂敏 ， 劉煥平主編 ． 單片機(jī)原理與應(yīng)用 [M].北京 ： 北京理工大學(xué)出版社， 2021，178180． [9] 李廣弟等．單片機(jī)基礎(chǔ) [M]. 北京 ： 北京航空航天出版社， 2021， 8790． 遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) 第 22 頁(yè) 22 附錄 A 遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) 第 23 頁(yè) 23 附錄 B 解碼程序 頭文件 define unit nusingned int define uchar unsingned char define MP3_ON 1 define MP3_OFF 0 Bit MP3 _Switch Uchar Key_Vol Uchar Key_Bas Uchar Key_Med Uchar Key_Tre //以上為鍵盤(pán)讀入的聲音控制參數(shù) //MP3COM 寄存器內(nèi)部位定義 sbit MPEN=MP3CON^7 sbit MPBBST= MP3CON^6 sbit CRCET=MP3CON^5 sbit MSKANC=MP3CON^4 sbit MSKREQ=MP3CON^3 sbit MSKLAY=MP3CON^2 sbit MSKSYN=MP3CON^1 sbit MSKCRC=MP3CON^0 //MP2STA1 寄存器內(nèi)部位定義 sbit MPFREQ=MP3STA1^4 sbit MPFREQ=MP3STA1^3 Mp3_Reg_Init()。 } MP3_Data_Input() { If ((MPFREQ= =1 )amp。 } } MP3_Clk_Set() { If(MPVER= =1) { MP3CLK=0 } Else { MP3CLK=1。 MP3TRE = Key_Tre。 } eles MP3_Error_Del()。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s actions. CSKA said they were surprised and disappointed by Toure39?？傆X(jué)得自己自己似乎應(yīng)該去做點(diǎn)什么，或者寫(xiě)點(diǎn)什么。t really grow up, it seems is not so important。 遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) 第 28 頁(yè) 28 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來(lái)，這個(gè)世界上，對(duì)某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅(jiān)決，還有，時(shí)間。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。 Those were broken into various shapes of stationery。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場(chǎng)還沒(méi)有開(kāi)始就宣告了終結(jié)的邂逅計(jì)劃 …… 那 些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there 。ll be traveling fast, so despite the distance, it will not be like diving into the deep 遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) 第 29 頁(yè) 29 end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。 Have declared the end of the encounter that haven39。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說(shuō)，是自以為是的精神寄托罷了。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個(gè)人的時(shí)候，自己的想法總是特別地清晰。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 The end of our life, and can meet many things really do? 而窮盡我們的一生， 又能遇到多少事情是真正地非做不可？ During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開(kāi)頭的年齡已經(jīng)到了尾聲。s 21 win. Michel Platini, president of European football39。s antiracism taskforce, is in London for the Football Association39。t agree with the discip