智能音响系统开发设计(毕设)

天津职业技术师范大学Tianjin University of Technology and Education

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Development and design of intelligent sound system

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；TA7630P

ABSTRACT

Music, Film and TV now are more and more popular along with the increasing of living standard. And,speaker is widely used for household and working. However, the performance of speaker now plays an important role for user,therefore, the intelligent speaker had been launched by designer in order to offer better-performance speaker to speaker hobbyist.

This kind of speaker takes AB audio frequency and integrated circuit TAD7294 as main Power Amplifier.It reaches 40W*2 and THD <= 10%. It is a multifunctionally intelligent and preferable speaker that possess actual-time power consumption indicator,power lighting,supply voltage indicator, receiver, MP3 Digital , adjustable AF audio frequency.

Power amplifier source is provided by positive and negative DC voltage with working voltage ±10V ~ ±40V, it adopts the 300W Cattle ring voltage transformer for supporting enough Power amplifier source. The adjustable voltage is among ±1.25V to ±32V, and the Power amplifier source indicates the actual-time working voltage by adopting ad Collecting voltage and dealing with 51 single chip. The volume, high-low sounds and Equilibrium degree are realized by 4pcs manual electric resistance of TA7630P circuit.The speaker is based on the electric circuit that able to Convert FM and MP3 to audio signal.It is a multi-fuctional and intelligent speaker that possesses Remote controller by infrared ray,volume + -, last/next songs, optional Output audio frequency, switchable MP3, FM external Audio-in. What is more, there are actual-time working Power Consumption indicates by LCD12864 while playing music, and 16pcs Diodes keep twinkling according to the changing Power Consumption. It works based on the Audio-in signal and 16-way voltage comparator.

Key Words：Speaker; MP3 Decoder; Cattle ring voltage

transformer;TDA7294,;TA7630P