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src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038603159677/4678558.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="y8qyeim" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038603159677/4678558.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="e8i2yuo" class="content"><p><span>需求數量：</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>產品關鍵詞：</span>南京華東師大音頻機構,音頻</p><p><span>***更新：</span>2021-01-19 07:10:04</p><p><span id="click" >瀏覽次數：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="iyqkgua" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海懷嚴文化傳媒有限公司</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="wmiw8s8" class="page-proshow02"><p class="title">詳細說明</p><div id="ykyokig" class="box"><p><p style="text-indent:25px">VU表和PPM表的工作原理：VU表即音量單位表，是一種準平均值表，當一個功率電平為4dB（1.228V），內阻為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，南京華東師大音頻機構，但不能指示峰值，是人的聽覺的均方根值。PPM表，實際上是準峰值電平表，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，南京華東師大音頻機構，恢復慢，比較真實地反映出聲音信號的準峰值變化，南京華東師大音頻機構，從而可避免設備過載，便于有效地控制和利用好傳輸入系統(tǒng)的大動態(tài)。當強迫力的頻率與振動物體的固有頻率成整倍數關系時，振動系統(tǒng)獲得較大的振幅。南京華東師大音頻機構</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京華東師大音頻機構,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038603159677/4678558.png"></div><p style="text-indent:25px">振幅：在特定的瞬間高于或低于坐標零線的距離稱為該波形的振幅，而正或負向的大漂移則分別為正或負的峰值振幅。表示聲音單位的強弱。頻率：一秒鐘內首尾銜接的周波數稱為波形的頻率，以赫茲（HZ）為計算單位，指每秒的周波數。與波長和聲速有關。聲速：指聲波的傳播速度。在15度時聲波在空氣中的速度每秒接近340米，聲波的速度隨溫度而變，溫度每升高一度，聲波速度約增加0.9米。波形：與時間相關的振幅變化。波形有簡單波和復合波，簡單波是因為它們是連續(xù)的和重復的，而且它們在零度上下是完全對稱的。復合波是很多波的組合，它們不需要重復，而且在零度上下也不需要對稱。南京華東師大音頻機構聲波所及的空間范圍稱聲場。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京華東師大音頻機構,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038659155824/7147319.png"></div><p style="text-indent:25px">室內條件下直達聲、近次反射聲、混響聲在人耳辨別空間感過程中的作用機理：從聲源到聽者直線傳播的聲音稱直達聲，直達聲決定了我們對聲源的方向、尺寸的感覺，并且攜帶聲源音色信息。直達聲到達之后50毫秒內到達的聲音，只經過小范圍的反射叫近次反射聲，直達聲開始到達與近次反射聲開始到達之間的時間為我們提供了關于房間尺寸的信息。遲于直達聲50毫秒以上的反射聲到達聽者時，經過許多不同表面的反射，這些密集的空間反射聲稱為混響聲?；祉懰p時間為我們提供了關于房間表面堅硬程度的信息，而混響聲與直達聲之間的比例則能告訴我們與聲源之間的距離。 </p><p style="text-indent:25px">回聲（殘響）：一個聲源的信號的不連續(xù)反復，與混響不同在于其聲音間隔更**于50-80毫秒。白噪聲：包含所有頻率且各頻率聲能的增量都相等的一種隨機信號，在還音過程中，白噪聲聽起來非常明亮，因為10KHZ到20KHZ的高頻范圍內和0HZ到10KHZ之間包含的白噪聲能量是相同的。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)。衍射：指聲波有繞過或通過聲學障礙物的固有能力。是聲音能夠在死角被聽見的屬性，原因是當聲音到達障礙物時會產生彎曲現(xiàn)象。擴散：聲音遇到障礙物就會產生反射現(xiàn)象，良好的擴散會產生平滑的混響聲，而不會產生回聲那樣不連續(xù)的聲音。音頻：聲音以電子或者其他方式在媒介上的存在形式，并非聲音本身。采樣頻率就是采用一段音頻，做為樣本。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京華東師大音頻機構,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038572759296/5736462.png"></div><p style="text-indent:25px">數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。而模擬信號是我們然后可以聽到的東西。不過模擬信號錄制過程中的修改簡直是一場災難，損失太大了。有此僻好的格倫?古爾德若也會瞠目結舌的。而數碼音頻復制100遍也不會有損耗，不信大家COPY一個wav文件試試？數碼音頻關鍵一步就是要把模擬信號轉換為數碼信號。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，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。這是數字音頻制作中十分重要的兩個概念。模擬音頻：一種與聲波的波形形成1：1的比例進行傳播或記載的信號表示方法。南京華東師大音頻機構</p><p style="text-indent:25px">聲音被錄制下來以后，無論是說話聲、歌聲、樂器都可以通過數字音樂軟件處理，或是把它制作成CD。南京華東師大音頻機構</p><p style="text-indent:25px">多普勒效應：在傳輸系統(tǒng)中因聲源與聽者之間的有效距離隨時間改變，而聽到的聲波頻率有所改變的聲現(xiàn)象，或由于聲源或者接受者的移動而產生的頻率變換效應，稱之為多普勒效應。倍頻程：人耳特別能夠察覺頻率為2：1的相關音響，這一比率關系是構成音樂八度音程的基礎，音樂的八度音程在聲學上稱為倍頻程。聲壓：聲擾動而產生的逾量壓強。逾量壓強=聲波存在時的壓強---沒有聲波時的壓強。單位為帕。聲壓級：表示聲壓的一個量度值，分貝：是貝爾的十分之一。分貝等于音量的振幅除以基準振幅的對數比例。動態(tài)范圍：以分貝為單位，表示一個媒介從背景噪聲電平到過載電平之間的范圍，用峰值余量和信噪比的圖表來完整地表示。南京華東師大音頻機構</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2913586.html</p></div></div></div></div></div><div id="es8m820" class="page-right twoColRt"><div id="imuagck" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="088ko88" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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