智能音响系统开发设计(毕设)

天津职业技术师范大学TianjinUniversityofTechnologyandEducation毕业设计专业：电气技术教育班级学号：电气1012-11学生姓名：赖惠平指导教师：李宏伟副教授二〇一五年六月天津职业技术师范大学本科生毕业设计智能音响系统开发设计Developmentanddesignofintelligentsoundsystem专业班级：电气1012班学生姓名：赖惠平指导教师：李宏伟副教授学院：自动化与电气工程学院2015年6月摘要伴随着人们生活水平提高，音影视越来越受到人们的欢迎，而音响在众多场地的用途越来越多，家庭、工作随处可见。人们对音响的使用性能也越来越有追求，为了大多数音响爱好者为此设计了智能音响系统音响。本设计以AB类音频功放TDA7294集成电路作为主功放电路，不失真功率（10%）达到40W*2，并带功率实时显示、功率灯光显示、功放电源电压显示、收音机、MP3数字文件解码、音频频率可调集为一体的一款具有功能多音质好功率大的音响系统。功放的电源需要正负直流电压提供，工作电压在±10V~±40V,电源采用环牛300W变压器，为功放提供充足功率源；电源电压在±1.25V~±32V可调，电源用ad采集电压通过51单片机处理后在数码管显示出实时电压。通过TA7630P电路4个手调电阻来调节音响的音量、高低音及左右平衡度。音响系统使用了可以实现FM及MP3文件解码转为的音频信号的电路，且带有红外小遥控，有音量加减、上下首、输出音频频率选择等多种功能，MP3、FM、外部音频输入可切换。在播放的音乐的过程有lcd12864显示实时运行功率，音频信号输入16路电压比较器带动16个发光二极管随着功放的功率变换而高低闪烁。关键词：音响；MP3解码；环变压器；TDA7294；TA7630PABSTRACTMusic,FilmandTVnowaremoreandmorepopularalongwiththeincreasingoflivingstandard.And,speakeriswidelyusedforhouseholdandworking.However,theperformanceofspeakernowplaysanimportantroleforuser,therefore,theintelligentspeakerhadbeenlaunchedbydesignerinordertoofferbetter-performancespeakertospeakerhobbyist.ThiskindofspeakertakesABaudiofrequencyandintegratedcircuitTAD7294asmainPowerAmplifier.Itreaches40W*2andTHD=10%.Itisamultifunctionallyintelligentandpreferablespeakerthatpossessactual-timepowerconsumptionindicator,powerlighting,supplyvoltageindicator,receiver,MP3Digitalfiledecoding,adjustableAFaudiofrequency.PoweramplifiersourceisprovidedbypositiveandnegativeDCvoltagewithworkingvoltage±10V~±40V,itadoptsthe300WCattleringvoltagetransformerforsupportingenoughPoweramplifiersource.Theadjustablevoltageisamong±1.25Vto±32V,andthePoweramplifiersourceindicatestheactual-timeworkingvoltagebyadoptingadCollectingvoltageanddealingwith51singlechip.Thevolume,high-lowsoundsandEquilibriumdegreearerealizedby4pcsmanualelectricresistanceofTA7630Pcircuit.ThespeakerisbasedontheelectriccircuitthatabletoConvertFMandMP3Filedecodingtoaudiosignal.Itisamulti-fuctionalandintelligentspeakerthatpossessesRemotecontrollerbyinfraredray,volume+-,last/nextsongs,optionalOutputaudiofrequency,switchableMP3,FMexternalAudio-in.Whatismore,thereareactual-timeworkingPowerConsumptionindicatesbyLCD12864whileplayingmusic,and16pcsDiodeskeeptwinklingaccordingtothechangingPowerConsumption.ItworksbasedontheAudio-insignaland16-wayvoltagecomparator.KeyWords：Speaker;MP3Decoder;Cattleringvoltagetransformer;TDA7294,;TA7630PI目录1绪论..............................................................................................................................11.1研究的背景与意义.............................................................................................11.2研究现状.............................................................................................................11.3研究的主要内容.................................................................................................12系统方案设计..............................................................................................................32.1系统总体方案设计结构.....................................................................................32.2音频功率放大器.................................................................................................32.3功放电源系统.....................................................................................................42.4电源系统的电压显示.........................................................................................42.5功率检测............................................................................................................42.6单片机选择........................................................................................................52.7系统总体设计方案............................................................................................53系统的硬件设计与实现..............................................................................................73.1电源电路设计PCB制作及电压检测显示.......................................................73.1.1直流电源................................................................................................73.1.2三端集成稳压器的PCB设计................................................................83.1.3电源电压测量及显示设计....................................................................93.2音频功率放大器的设计及PCB制作.............................................................103.2.1集成功放TDA7294电路设计..............................................................103.2.2功率放大器的PCB制作.......................................................................113.2.3集成功放TDA7294芯片的散热...........................................................113.3直流控制芯片TA7630P集成音频滤波电路.................................................123.4MP3音频解码电路..........................................................................................133.4.1MP3音频解码器的功能介绍...............................................................133.4.2红外线遥控器的功能介绍..................................................................133.5单片机控制电路...............................................................................................143.5.1电源电压显示的处理器Atmega8单片机简介..................................143