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摘要调频收音机(FMRadio)一直在人们的娱乐生活中占有非常重要的地位。从最初的晶体管收音机到现在的网络收音机,说明通过广播享受生活一直是人们追求的生活方式。如今,随着消费类电子的兴起、繁荣以及数字电子的发展,广大从事消费类电子设计的商家都不忘在诸如智能手机、MP3、便携式Video播放器等产品中嵌入FM部分。可传统的调频解决方案存在电路体积大、调谐不便、稳定性欠佳等弊端。为了解决上述问题,众多的半导体公司纷纷寻求调频接收机的ASIC解决途径。本文介绍了数字调频立体声收音机的设计与实现。其解决了传统的调频方案中体积大、调谐不方便、稳定性不好等这些缺点。在本文中主要介绍了该设计的软件设计流程、硬件电路、系统测试。该数字调频立体声收音机的MCU采用ATMega16单片机,单片机是本系统的核心器件。由收音机模块TEA5767实现其频率的接收,LCD1602实时显示时间、频率以及音量,用24C16来存储频率,以TDA2822作为音频功率放大器,并通过机械电位器调音量。本设计通过按键来实现调节频率大小,用DS1302实时显示时间。关键词:单片机数字调频TEA5767DS1302TDA2822AbstractFMradio(FMRadio)hasbeenoccupyinganimportantpositioninpeople'sentertainmentlife.Fromthefirsttothetransistorradionetworkradionow,throughradioandenjoythelifeisalwaysthepursuitoflifestyle.Now,withtheriseofconsumerelectronics,prosperityanddevelopmentofdigitalelectronics,isengagedintheconsumerelectronicsdesignbusinessesdon'tforgetsuchasintelligentmobilephone,MP3,portableVideoplayersandotherproductsofembeddingtheFMpart.FMcanbethetraditionalsolutiondisadvantagesoflargevolume,inconvenientcircuittuning,poorstability.Inordertosolvetheaboveproblem,semiconductor,manyhavesoughtFMreceiverASICsolution.ThispaperintroducesthedesignandRealizationofdigitalFMstereoradio.Thesolutiontothefrequencymodulationschemeinthetraditionallargevolume,tuningisnotconvenient,thestabilityisnotgood,theseshortcomings.Inthispapermainlyintroducesthesystemsoftwaredesignprocess,thedesignofthehardware.ThedigitalFMstereoradioMCUusingATMega16SCM,SCMisthecoredeviceofthesystem.TheTEA5767radiomodulecanreceivethefrequency,LCD1602real-timedisplayoftime,frequencyandvolume,use24C16tostorethefrequency,withTDA2822astheaudiopoweramplifier,andbymechanicalpotentiometertoadjustthevolume.Thisdesignthroughthebuttontoadjustfrequency,usingDS1302real-timedisplay.Keywords:singlechipdigitalFMTEA5767DS1302TDA2822目录摘要..............................................1Abstract...........................................2第一章系统结构及功能介绍............................41.1系统工作原理概述...........................................................................................................41.2系统的特点和使用...........................................................................................................51.2.1系统的特点...........................................................................................................51.2.2使用说明...............................................................................................................5第二章硬件系统的设计..............................62.1调频收音功能的实现和电路............................................................................................82.1.1调谐收音功能的实现............................................................................................82.2音量调节和音频放大电路[1]..........................................................................................132.2.1音频放大电路[2]...................................................................................................142.3.1DS1302引脚功能表及内部结构图....................................................................152.3.2DS1302的控制字节说明....................................................................................152.4键盘和显示电路..............................................................................................................172.4.1键盘......................................................................................................................172.5.2显示......................................................................................................................18第三章系统软件设计................................193.1主程序部分.....................................................................................................................193.2电台调谐功能软件设计流程图......................................................................................203.3音量调节功能软件流程图..............................................................................................22第四章系统测试...................................234.1TEA5767的频率输入方式和存储..................................................................................234.2LCD显示..........................................................................................................................234.3时钟模块DS1302............................................................................................................234.4系统的主要技术指标.....................................................................................................23第五章结束语....................................24致谢.............................................25第一章系统结构及功能介绍1.1系统工作原理概述本系统以TEA5767作为收音模块来频率的接收,和单片机ATmega16作为控制中心,系统结构如图1-1所示。图1-1系统基本工作原理方框图系统主要包括频率接收、存储频率、键盘控制、机械电位器调节音量、音频放大、LCD显示、时钟、以及控制心脏单片机电路。TEA5767模块接收频率是由单片机ATmega16控制的。即其接收频率是单片机写入TEA5767内PLL寄存器的值决定的。其接收频率与PLL值的关系如下公式:[4()]/RFIRREFSPLLFFFRFF:接收频率(kHz)IRF:中频(TEA5767为225kHz)REFSF:参考频率(由TEA5767外接晶振而定),本设计外接32.768kHZ的晶振。1.2系统的特点和使用1.2.1系统特点●可以通过按键来加减调节频率,同时还可经按键存储电台●可以存储很多个电台的频率●可以调节左右声道的音量●数字调频立体声●具有电子时钟功能●调节方便且音质好1.2.2使用说明(1)开机接通电源后系统复位进入工作状态,此时可以进行各项操作。此时LCD显示:(2)工作状态:系统初始化后,进入工作状态,这时LCD显示。(3)各个按键的功能:1#.这个建是对电台频率的存储。消除开关抖动,软件设置了延时功能,频率:87.
本文标题:收音机论文
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