論文標(biāo)準(zhǔn)WORD格式排版 28頁 15200字

內(nèi)容摘要：F62R MP3以中央處理器（解碼芯片）為核心，由程序存儲器、FLASH閃存、電源控制電路、D／A轉(zhuǎn)換、音頻輸入輸出、USB接口電路和OLED顯示電路等部分構(gòu)成。 工作原理是解碼芯片將歌曲文件從存儲體（閃存芯片或微硬盤等介質(zhì)）中讀取出來，對信號進(jìn)行解碼；解碼后的數(shù)字音頻信號通過數(shù)模轉(zhuǎn)換器轉(zhuǎn)換成模擬音頻信號；然后把還原的模擬音頻信號放大并通過低通濾波器濾波后輸出給耳機(jī)。本設(shè)計(jì)采用凌陽的SPCA755解碼芯片，該芯片集成了DSP、A／D轉(zhuǎn)換，USB驅(qū)動等功能，比一般用單片機(jī)和單獨(dú)的DSP芯片的設(shè)計(jì)，外圍電路簡化了很多， 體積更?。桓匾氖菍τ谝魳肺募獯a處理的功能也集成到了芯片內(nèi)部，完全由硬件來完成，不用考慮復(fù)雜的多媒體處理以及編解碼算法的開發(fā)，這就大大節(jié)約了成本。同時該產(chǎn)品還具有LINE-IN的功能，便于拷貝其他MP3上的文件。
F62R MP3是集收音、錄音、復(fù)讀、視頻播放等多種功能于一身的新一代MP3，具有體積小、便于攜帶、功耗低和不易損壞等優(yōu)點(diǎn)，最重要的是壓縮比高，音質(zhì)較好，制作簡單，性價比較高。
關(guān)鍵詞：F62R MP3 解碼芯片 程序存儲器 FLASH閃存芯片 音樂播放器

The Hardware Design OF F62R MP3 Player

Abstract: F62R MP3 regards central processing unit (Decode chip) as the core, which is consist of procedure memory, FLASH memory, power control circuit, D/A change, audio frequency input and export, USB interface circuit and OLED reveal circuit ,etc. Operation principle : decode chip read and get song file form storing body (flashing memory chip or little hard disk ,etc. medium ) at first; decode the signal; Digital audio frequency signal decode, through count mould converter change analog audio frequency signal; Amplify and export analog audio frequency signal that reduce to the phone behind the low put through low filter finally. The Design , we adopt Sunplus SPCA755 decode chip originally, integrated DSP, A/D change, USB drivers and so on for the function, compared with generally using the one-chip computer and single DSP chip design principle, the peripheral circuit simplifies much, the volume can be smaller; The more important thing is , integrate get chip to music file function punished to decode, totally finished by the hardware, needn't consider the complicated multimedia is dealt with , the development of the compiled code algorithm, this has saved the cost greatly . This product also has a function of LINE-IN at the same time, it is easy to copy the file form other MP3.
F62R MP3 often collects the radio , recorder , replies reading , many kinds of functions that the video is broadcast ,etc. in one suit, small and easy to carry, low power dissipation, such advantages as difficult physics is damaged , the most important thing is , compress than high , the tone quality is better , making is simple, the price is relatively low.
Key Words : F62R MP3 Decode chip procedure memory FLASH memory Music Player and so on.


目 錄

一、引言 1
(一) MP3的誕生 1
（二）MP3的發(fā)展簡史 1
（三）MP3的發(fā)展前景 2
二、MP3的分類 3
(一) 閃存MP3 3
(二) 硬盤MP3 3
三、MP3音頻壓縮格式簡介和相互轉(zhuǎn)換 3
(一) MP3音頻壓縮格式 3
1. WAV格式 3
2. MP3（CBR、VBR、ABR）格式 4
3. WMA格式 4
(二) 音頻壓縮格式的轉(zhuǎn)換 4
1. WAV→MP3 4
2. MP3→WAV 5
四、電路系統(tǒng)設(shè)計(jì) 5
(一) F62R MP3工作原理和系統(tǒng)框圖 5
五、各單元電路的設(shè)計(jì) 5
(一)主芯片（解碼芯片）的選擇 5
(二) 電源電路的設(shè)計(jì) 8
1. 電源升、降壓芯片的選擇 8
2. 電源升降壓電路 9
3. 電源充放電保護(hù)電路 9
4. 電源控制電路的設(shè)計(jì) 12
（三）USB接口的設(shè)計(jì) 14
（四）存儲器電路的設(shè)計(jì) 15
1. 程序存儲器 15
2. FLASH閃存芯片 15
（五）音頻輸入和LINE-IN接口電路 16
（六）FM收音機(jī)電路 17
（七）音頻輸出 18
1. DAC電路 18
2. 耳機(jī)輸出電路 19
（八）MP3顯示屏 19
1. MP3顯示屏的分類 19
2. 顯示屏的選擇與設(shè)計(jì) 20
(九) 測試結(jié)果 20
六、結(jié)束語 22
附錄 23
參考文獻(xiàn) 25