前置3D音效处理器设计

范文编号:TX199 附开题报告,任务书,外文翻译,原理图及PCB,程序,范文字数:19834,页数:44

摘  要

     在音效发展的历史上，3D声音占据着很重要的角色。说到3D声音，就会让人想起立体声的概念。立体声是一种根据心理声学中 “欺骗”人耳的方法，其作用就是使得人耳能够感觉到音源的位置。但是3D声音远远比这要复杂。3D声音在现代社会得到了广泛的应用，一些多媒体的工具如：手机，MP3，PDA等都大量的使用3D的声音效果，它可以给人一种听觉上的不同效果。而开发使用高效，低成本的3D音效处理器是当今社会一个工作难题。
     本范文是了基于ATMEL公司生产的单片机AT89S51单片机为核心。通过AT89S51控制美国半导体公司开发的LM4857这个3D音频处理芯片来进行3D音效的处理，并且详细地介绍了前置3D音效处理器的制作过程。实现对3D音效的处理，并在这个基础上通过字符型的液晶显示屏显示当前3D处理的消息，对用户设置参数进行了掉电存储。本文还介绍了KEIL这个流行的单片机编译软件的基本使用方法。最后在调试电路中还有前置3D音效处理器的的硬件调试和软件调试的具体过程。
 本文首先从3D音效的历史出发，再到每部分的器件的选择，结合了选择的器件对硬件电路和软件进行了设计，最后给出了各个部分的调试过程。本设计中硬件电路充分的考虑和使用了单片机的I/O，再充分考虑了软件编写的方便后最大限度的减少了硬件资源，节省了设计的成本。软件设计上使用了模块式的开发过程，最大限度的提高了软件的运算速度，可以很好的实现了软件的移植，软件编写思路严谨，把系统出现BUG的几率降到了最低。可以说本文在3D音效处理器的设计到制作都有很详细的介绍了。
关键词：3D音效；LM4857；存储；程序
 
 

Abstract
   The 3D sound played a very vital role in the development of audio effects. Mentioning 3D sound, people would think of the stereo sound - one way to mislead people’s ears in psychology acoustics - whose function is to make people’s ears feel the position of the sound source, but the 3D sound is more complex than it. The 3D sound is widely used in our life. Thanks to the 3D sound effect, such multi-media equipment as mobile phone, MP3, PDA, could impress people with different audio effect. Now how to develop low cost 3D sound effect processor is a socially difficult task.
    The paper focuses on the AT89S51 MCU based on ATMEL Corporation. We use the MCU to control the LM4857 which is produced by the American Nation company to make the 3D sound effect processing and introduce the front 3D sound effect processor manufacture process at details, which has succeeded in 3D sound effect processing and manage to storage the current 3D processing information displayed on the character liquid crystal screen without electricity. This article also introduces the basic application method of KEIL, the popular MCU translates software and the process that the 3D sound effect processor debugs with the hardware debugging and software debugs.
 This article first embarks from the 3D sound effect history, and then discusses about the selection of components and the design of hardware electric circuit and software, considering the design of hardware electric circuit and use of the MCU′s I/O. Again software compiles convenience has been considered to save the design cost by reducing the hardware at maximum. Software design has been used in the module -like performance history and increase the software’s operating speed at maximum. Appeared BUG the system the probability to fall has been lowest. The paper gives a detailed introduction in the 3D sound effect processor design manufacture.
Key words: 3D sound; LM4857; save; software
 

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目    录

引 言 ……………………………………………………………………………………  1
1  设计准备……………………………………………………………………………  2
2  硬件部分……………………………………………………………………………  6
3  软件部分…………………………………………………………………………… 11
4  电路板制作………………………………………………………………………… 23
5  烧录器的制作……………………………………………………………………… 24
6  调试过程…………………………………………………………………………… 25
总结………………………………………………………………………………… 30
谢辞………………………………………………………………………………… 32
参考文献…………………………………………………………………………… 33
附录 ……………………………………………………………………………………… 34

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