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音频多重混响设计

论文编号:JD164 字数:16672,页数:37

摘要
随着现代通信的发展，数字化日益渗透人们的日常生活，人们对各种多媒体业务的需求日益增长，我们正享受着数字化带来的方便和快捷，卫星电视、数字电视、各种数码音乐产品正改变着我们的生活。于是便要求得到更多更好的音频产品和服务。数字声音作为一种存储、处理和传输高保真声音的方法，在消费电子、专业声音等众多领域已得到广泛应用。为了获得足够大的高频输出功率，必须采用高频功率放大器。高频功率放大器的特点是输出功率大和效率高。我们这里需要的是小信号低功率放大，故采用甲类放大器。甲类放大器输出电路本身具有抵消奇次谐波失真，且甲类放大器管子始终工作在线性曲线内，晶体管自始自终处于导通状态。因此，不存在开关失真和交越失真等问题。甲类放大器始终保持大电流的工作状态。所以对猝发性声音瞬间升降能讯速反映。因而输出功率发生急剧变化时，电源电流变化微乎其微。由这种强大的驱动者来推动扬声器就能轻而易举的获得高保真的重放效果。论文针对目前一部分参数音频编码音源模型在高采样率下出现的各种问题进行改进，提出一种而向44.1KHz/48KHz高采样率音频信号的参数音频编码系统，使用了可以有效兼顾码率与音质的多分辨率正弦模型和多分辨率ERB噪声模型。同时融合多种参数音频编码方案的优点，在编码器结构上进行了调整，将只对某类信号有较好编码效果的模块，如谐波结构分析模块、双变换短时成分检测与双变换短时模块等，作为选项纳入到编码器中，由使用者在编码时根据小同源声文件的小同特点，来决定是否使用和如何使用，而这些灵活的设置都可以通过码流中预先定义好的几个标示比特位来告知解码器，对解码器本身的构成与复杂度少没有直接的影响。

关键词:混响,多重混响,音频

Abstract
Along with the development of modern correspondence, the numeral turns increasingly daily life of permeating people, the people's need to various multi-media business increases increasingly, we are enjoying numeral to turn the convenience for bringing with fast, the satellite television, numerical television, various figures music product is changing our lifes. Hence request to get more better audio frequency product kimono duty then Numerical voice conduct and actions a kind of saving, handle and deliver high fidelity voice of method, Be consuming an electronics, professional voice etc. numerous realms have already got extensively applied. For acquiring enough big high to output power, have to adopt high power enlarger. High power's characteristics of the enlarger is greatly to output powers and the efficiency is high. We here what to need is a small signal low power to enlarge, so adopt AN enlarger. The exportation electric circuit of the AN enlarger has strange time wave of offset to lose really, and AN enlarger the pipe works always inside on-line sex curve, the transistor is from the jump from be placed in to lead an appearance eventually. There fore, the nonexistent switch loses really with hand over to lose to really wait a problem more. The AN enlarger keeps the work appearance of big electric current always. So ascend and descend to the hair orotund moment ability the reflects soon. As a result output power to take place a nasty upheaval to turn, the power supply electric current changes extremely minute. Being driven strongly by this kind of can acquire hi-fi easily to pushing loudspeaker of heavy put result. The thesis aims at currently a part of parameter audio frequencies to code a sound source, the model appears under the high sample rate of various problem carry on an improvement, putting forward 1 kind but to the coding system of the parameter audio frequency of 44.1 KHzs/48 KHzs high sample rate audio frequency signal, using can look after both sides a code rate and sound quality effectively of many resolution sine model with many models. Blend various advantages of the coding project of the parameter audio frequencies in the meantime, carried on adjustment on the coder structure, have to a certain signal more the mold piece of[with] coding result, if wave structure analytical transformation short time of the mold piece, double the composition examine and double the transformation short time mold piece etc. is an options to bring into coder, from user while coding according to small together source voice document of small together characteristics, decide whether use and how use, but these vivid constitutions can through a code flow in define several good to mark ratio in advance tell a decoding machine especially, constituting decoding machine is little with complications to without direct influence.

Keyword: Mix to ring,Have another heavy mix to ring,Audio frequency

绪论............................................................................... 1
第一章音频多重混响的设计 ..........................................................3
1.1 设计指标........................................................................3
1.2设计思路....................................................................... 3
1.3 组态与频响的关系................................................................4
1.4 共射-共基电路.................................................................. 4
1.5 共源-共基电路 ..................................................................5
1.6 互补对称放大器的失真........................................................... 6
1.7 DC化无大环路负反馈功放电路 .................................................... 6
第二章混响的概念和相位的调节 ..................................................... 8
2.1 混响 ....................................................................... ...8
2.2 延时 .......................................................................... 9
2.3 声激励 ....................................................................... 10
2.4 相位的调节 ....................................................................11
2.5 整体缩混输出 ..................................................................11
2.6 多重混响处理精要 ..............................................................12
2.7 频率均衡 ......................................................................12
第三章音频混响电路的设计 .........................................................15
3.1 综合电路分析 ..................................................................15
3.2 音频切换电路 ..................................................................16
3.3 电源电路 ......................................................................17
3.4 末级共放电路...................................................................18
3.5 扬声器保护电路.................................................................20
3.6音频功率放大器电路..............................................................20
3.7 ADPCM语音编解码电路设计 .......................................................22
第四章结论....................................................................... 26
4.1论文的主要结果 .................................................................26
4.2今后工作的方向 ................................................................ 27
致谢 ....................................................................... ......29
参考文献 ......................................................................... 30
附录....................................................................... ......31

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