音頻多重混響設計

電子機電論文編號:JD164     字數(shù):16672,頁數(shù):37

目      錄

緒論............................................................................... 1
第一章音頻多重混響的設計 ..........................................................3
1.1 設計指標........................................................................3
1.2設計思路.......................................................................  3
1.3 組態(tài)與頻響的關系................................................................4
1.4 共射-共基電路.................................................................. 4
1.5 共源-共基電路 ..................................................................5
1.6 互補對稱放大器的失真........................................................... 6
1.7 DC化無大環(huán)路負反饋功放電路 .................................................... 6
第二章混響的概念和相位的調節(jié) ..................................................... 8
2.1 混響 ....................................................................... ...8
2.2 延時 .......................................................................... 9
2.3 聲激勵 ....................................................................... 10
2.4 相位的調節(jié) ....................................................................11
2.5 整體縮混輸出 ..................................................................11
2.6 多重混響處理精要 ..............................................................12
2.7 頻率均衡 ......................................................................12
第三章音頻混響電路的設計 .........................................................15
3.1 綜合電路分析 ..................................................................15
3.2 音頻切換電路 ..................................................................16
3.3 電源電路 ......................................................................17
3.4 末級共放電路...................................................................18
3.5 揚聲器保護電路.................................................................20
3.6音頻功率放大器電路..............................................................20
3.7 ADPCM語音編解碼電路設計 .......................................................22
第四章結論....................................................................... 26
4.1論文的主要結果 .................................................................26
4.2今后工作的方向 ................................................................ 27
致謝 ....................................................................... ......29
參考文獻 ......................................................................... 30
附錄.......................................................................  ......31

摘    要
隨著現(xiàn)代通信的發(fā)展，數(shù)字化日益滲透人們的日常生活，人們對各種多媒體業(yè)務的需求日益增長，我們正享受著數(shù)字化帶來的方便和快捷，衛(wèi)星電視、數(shù)字電視、各種數(shù)碼音樂產品正改變著我們的生活。于是便要求得到更多更好的音頻產品和服務。數(shù)字聲音作為一種存儲、處理和傳輸高保真聲音的方法，在消費電子、專業(yè)聲音等眾多領域已得到廣泛應用。為了獲得足夠大的高頻輸出功率，必須采用高頻功率放大器。高頻功率放大器的特點是輸出功率大和效率高。我們這里需要的是小信號低功率放大，故采用甲類放大器。甲類放大器輸出電路本身具有抵消奇次諧波失真，且甲類放大器管子始終工作在線性曲線內，晶體管自始自終處于導通狀態(tài)。因此，不存在開關失真和交越失真等問題。甲類放大器始終保持大電流的工作狀態(tài)。所以對猝發(fā)性聲音瞬間升降能訊速反映。因而輸出功率發(fā)生急劇變化時，電源電流變化微乎其微。由這種強大的驅動者來推動揚聲器就能輕而易舉的獲得高保真的重放效果。論文針對目前一部分參數(shù)音頻編碼音源模型在高采樣率下出現(xiàn)的各種問題進行改進，提出一種而向44.1KHz/48KHz高采樣率音頻信號的參數(shù)音頻編碼系統(tǒng)，使用了可以有效兼顧碼率與音質的多分辨率正弦模型和多分辨率ERB噪聲模型。同時融合多種參數(shù)音頻編碼方案的優(yōu)點，在編碼器結構上進行了調整，將只對某類信號有較好編碼效果的模塊，如諧波結構分析模塊、雙變換短時成分檢測與雙變換短時模塊等，作為選項納入到編碼器中，由使用者在編碼時根據小同源聲文件的小同特點，來決定是否使用和如何使用，而這些靈活的設置都可以通過碼流中預先定義好的幾個標示比特位來告知解碼器，對解碼器本身的構成與復雜度少沒有直接的影響。

關鍵詞:混響,多重混響,音頻

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