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class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038341958524/6554051.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="blyvsry" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038341958524/6554051.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3kce329" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>安徽東華大學(xué)音頻試題,音頻</p><p><span>***更新：</span>2021-01-27 01:10:25</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="wac3y39" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海懷嚴(yán)文化傳媒有限公司</a></p><p><span>聯(lián)系人：</span>曹晨光</p><p><span>郵箱: </span>deforu@163.com</p><p><span>電話: </span>13611988611</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.oranshine.com</p><p><span>手機: </span>021-64458098</p><p><span>地址: </span>宜山路508號3E室</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="a8xebtf" class="page-proshow02"><p class="title">詳細說明</p><div id="o9kwdkr" class="box"><p><p style="text-indent:25px">動態(tài)余量/峰值余量：在到達某種失真前，安徽東華大學(xué)音頻試題，在基準(zhǔn)電平以上的信號處理能力。駐波：室內(nèi)聲學(xué)術(shù)語。用以表示在空間某一點上，聲音或多重墻面相互作用后，在不同頻率上加強或抵消聲場的一種現(xiàn)象，駐波導(dǎo)致室內(nèi)聲場不一致，在低頻或小空間尤其容易產(chǎn)生。響度：對聲音強度的一種主觀感覺，是聲壓級、電平、振幅及其它因素給人的綜合感覺。弗萊徹與蒙森曲線（等響曲線）：表述人的聽覺對不同頻率的聲音在等響情況下與標(biāo)準(zhǔn)音（1000HZ）對應(yīng)的聲級值關(guān)系，安徽東華大學(xué)音頻試題，安徽東華大學(xué)音頻試題。等響計權(quán)曲線有四種：A計權(quán)曲線0—30dB B計權(quán)曲線30—60dB C計權(quán)曲線60—130dB 寬帶計權(quán)曲線22.4HZ---22.4KHZ范圍內(nèi)平直，范圍外極具下降。人類能夠聽到的所有聲音都稱之為音頻，它可能包括噪音等。安徽東華大學(xué)音頻試題</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽東華大學(xué)音頻試題,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038341958524/6554051.png"></div><p style="text-indent:25px">數(shù)碼音頻是我們保存聲音信號，傳輸聲音信號的一種方式，它的特點是信號不容易損失。而模擬信號是我們?nèi)缓罂梢月牭降臇|西。不過模擬信號錄制過程中的修改簡直是一場災(zāi)難，損失太大了。有此僻好的格倫?古爾德若也會瞠目結(jié)舌的。而數(shù)碼音頻復(fù)制100遍也不會有損耗，不信大家COPY一個wav文件試試？數(shù)碼音頻關(guān)鍵一步就是要把模擬信號轉(zhuǎn)換為數(shù)碼信號。就電腦而言是把模擬聲音信號錄制成為wav文件，這個工作Windows自帶的音頻機也可以做到，但是它的功能十分有限，不能滿足我們的需求，所以我們用其他專業(yè)音頻軟件代替，如Sound Forge等。錄制出來的文件就是wav文件，描述wav文件主要有兩個指標(biāo)，一個是采樣頻率，或稱采樣率、采率，另一個是采樣精度也就是比特率。這是數(shù)字音頻制作中十分重要的兩個概念。常州上海大學(xué)音頻收費標(biāo)準(zhǔn)粉紅噪聲：各倍頻程中聲能相等的隨機噪聲，利用粉紅噪聲以及實時頻譜分析儀可以測試聲音系統(tǒng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽東華大學(xué)音頻試題,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038659155824/7147319.png"></div><p style="text-indent:25px">音頻處理：一、音頻媒體的數(shù)字化處理：隨著計算機技術(shù)的發(fā)展，特別是海量存儲設(shè)備和大容量內(nèi)存在PC機上的實現(xiàn)，對音頻媒體進行數(shù)字化處理便成為可能。數(shù)字化處理的中心是對音頻信息的采樣，通過對采集到的樣本進行加工，達成各種效果，這是音頻媒體數(shù)字化處理的基本含義。二、音頻媒體的基本處理：基本的音頻數(shù)字化處理包括以下幾種：不同采樣率、頻率、通道數(shù)之間的變換和轉(zhuǎn)換。其中變換只是簡單地將其視為另一種格式，而轉(zhuǎn)換通過重采樣來進行，其中還可以根據(jù)需要采用插值算法以補償失真。針對音頻數(shù)據(jù)本身進行的各種變換，如淡入、淡出、音量調(diào)節(jié)等。通過數(shù)字濾波算法進行的變換，如高通、低通濾波器。</p><p style="text-indent:25px">VU表和PPM表的工作原理：VU表即音量單位表，是一種準(zhǔn)平均值表，當(dāng)一個功率電平為4dB（1.228V），內(nèi)阻為600Ω.信號頻率為1KHZ的正弦波信號在VU表的輸入端時,表針刻度盤上位置在0VU.單位為每一個VU表示為一個dB，VU表和人耳對聲音的響度感受比較吻合，但不能指示峰值，是人的聽覺的均方根值。PPM表，實際上是準(zhǔn)峰值電平表，因為它是采用峰值檢波器而按簡諧信號的有效值確定刻度的，PPM表的大特點是指針上升快，恢復(fù)慢，比較真實地反映出聲音信號的準(zhǔn)峰值變化，從而可避免設(shè)備過載，便于有效地控制和利用好傳輸入系統(tǒng)的大動態(tài)。一個聲源的信號的不連續(xù)反復(fù)，與混響不同在于其聲音間隔更**于50-80毫秒。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽東華大學(xué)音頻試題,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038167759356/6633536.png"></div><p style="text-indent:25px">影視作品中聲音和畫面的關(guān)系：聲音在影視藝術(shù)作品中已經(jīng)有著和畫面同等重要的地位了，有時甚至還會超過畫面的重要性成為影視作品中重要的元素。電影聲、畫之關(guān)系，越來越出現(xiàn)變化無窮的境界，新的聲畫語言組合方式也因而不斷被電影藝術(shù)家們推出。影視藝術(shù)作品中聲音和畫面的關(guān)系主要有三種：1畫面占主要地位，聲音烘托畫面。2聲音占主要地位，畫面烘托聲音（音樂電視、音樂題材的影片）。3聲音與畫面同樣重要，誰也離不開誰。影視藝術(shù)作品制作時賦予畫面與聲音的關(guān)系大致也分三種：1聲畫同步。2聲畫對位。3聲畫分立。在聲畫分立之時，聲音一般不會來自畫面之中，而以畫外形式出現(xiàn)，但在總體情感、情緒上，又有一種相互映照的關(guān)系。而聲畫對位，意味著聲音與畫面在情感、內(nèi)涵、情緒、情調(diào)、氛圍、節(jié)奏恰好是錯位、對立的，形成很大反差的。正是由于聲音與畫面的差異、對立、錯位、相反，才更有力地形成一種對比和對照，從而用一種反差的方式更強有力地表達出正面的意義、價值。音頻直觀的，讓人們便于理解的概念就是把自然界中存在的和人們?yōu)榱四撤N需要創(chuàng)造的音響記錄下來。常州上海大學(xué)音頻收費標(biāo)準(zhǔn)</p><p style="text-indent:25px">任何聲音都可以分解為多個正弦波和諧波，多個正弦波和諧波進行組合形成復(fù)合波。安徽東華大學(xué)音頻試題</p><p style="text-indent:25px">相位：因為一個周期可始于波形的任意一點，所以可以用兩個波形發(fā)生器來產(chǎn)生頻率相同且振幅值相等的兩個正弦波，但它們在同一時刻上幅度不同。這樣的波形稱為不同相的波。相移：一個波形相對于另一個波形超前或滯后的相位量，是其中一個波形在傳輸上時間延遲的結(jié)果。相移度=時間延遲（秒）×頻率×360度。拍音與拍頻：兩個頻率相近簡諧振動產(chǎn)生的疊加振動，其振幅形成周期性變化的聲現(xiàn)象稱為拍音，這一合成振幅的變化頻率稱為拍頻。等于兩個振動的頻率之差。諧波：一個具有頻率為一個波形頻率的整倍數(shù)的波形，就稱為一個波形的諧波。任何重復(fù)的波形都可以分解為含有基波頻率和一系列為基波倍數(shù)的諧波的正弦波分量。安徽東華大學(xué)音頻試題</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3024331.html</p></div></div></div></div></div><div id="xzgipwt" class="page-right twoColRt"><div id="p88ikw2" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="dxu3lcj" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="dsp7q7d" 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