多功能音响系统的设计与制作 毕业设计

编号：毕业设计说明书

题目：多功能音响系统的设计与制作

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理论研究

实验研究工程设计软件开发

2013年5月15日

摘要

当今音乐成了人们时尚享受的非常重要的一部分。多功能音响给家庭娱乐及休闲等带来了更多的方便，音响的发展逐渐走向成熟，它优越的音响效果和人性化设计在市场里发挥日益重要的作用。音响系统能如实地重现原始声音和原始声场，并能对音频信号进行处理，使重现的声音优美动听。现代家庭对于音响的选择更趋向于其音效、美观、实用的特点。随着音响技术的发展，现代人对音响的音质真实性要求也越来越多。

正因为对音响的音质真实性要求越来越多，高保真音响应运而生，它具有能够如实的反映出声音信号的音色，音高和音强等音质状况本来面貌的能力，并可以同时对声音信号进行必要的加工。本课题顺应当今趋势，设计、制作出一套大功率、低失真、频带较宽，同时考虑经济适用的家用音响系统。系统要求由稳压电源、前置、均衡、功放三部分组成，前置放大级主要任务是完成小信号电压放大任务，同时要求低噪声、低温漂。音调调节主要完成高低音、左右平衡、音量调节。功率放大级主要任务是在允许的失真限度内,尽可能高效率地向负载提供足够大的功率，要求是输出功率要大、效率要高。本次课题研究选择通过集成运放NE5532、LM324、LM3886的配套使用可以使本电路系统设计简洁、实用并且达到高增益、高保真、高效率、低噪声、宽频带、快响应的指标，具有一定的使用和参考价值。

关键词：音响；稳压电源；前级放大；均衡器；LM3886后级运放

Abstract

In this era of science and technology developed, music has become people to enjoy a very important part of fashion. Multi-functional audio for home entertainment and leisure has brought more convenience, such as sound development in recent years gradually mature, its superior sound effects and humanized design in the market, play an increasingly important role. Sound system can faithfully reproduce the original sound and the original sound field, and the audio signal processing and modification, to make repeat voice sounds beautiful. Modern family for sound choices tend to its sound, beautiful and practical characteristics. With the development of audio technology, the modern stereo sound quality requirements also more and more authenticity.

Because of sound quality requirements more and more authenticity, hi-fi arises at the historic moment, it can truthfully reflect the sound signal tone, pitch and sound intensity quality status of natural ability, at the same time, the voice signal to make the necessary modification and processing. This topic conforms to the trend, design and production of a set of high power, low distortion, frequency band is wide, at the same time, considering the economic applicable home sound system. System requirements by the regulated power supply, front, equilibrium, power amplifier of three parts, preamplifier stage, main task is to complete small signal voltage gain, low noise, low temperature drift is also required. Tone control is mainly finished in which high and low, left and right balance and volume. Power amplifier stage main task is within the allowed distortion limits, as efficiently as possible to provide enough power to the load, the requirement is that the output power is larger, the efficiency is higher. This topic research choice through integrated op-amp NE5532, LM324, supporting the use of LM3886 system can make the circuit design is simple and practical and achieve high gain, high fidelity, high efficiency, low noise, wide band, fast response indicators, has certain use and reference value.

Key words: hi-fi ; Regulated power supply ; Before the amplifier ;equalizer ;LM3886 power amplifier