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href="http://www.cdcfah.com/zh/"><span>展會(huì)信息</span></a></li></ul></div></nav><section class="wrap clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="vo2dzlc" class="twoCol"><div id="ayx8zqh" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_swfw/">商務(wù)服務(wù)</a>?<a href="http://www.cdcfah.com/cp/second-swfw_zlhxx/">展覽會(huì)信息</a>?<a href="http://www.cdcfah.com/cp/third-zlhxx_jypxysz/">教育、培訓(xùn)、藝術(shù)展</a>?安徽華東師大音頻證書創(chuàng)造輝煌上海懷嚴(yán)文化傳媒供應(yīng)</p><div id="esocnok" class="leftbox clearfix"><h1>安徽華東師大音頻證書創(chuàng)造輝煌上海懷嚴(yán)文化傳媒供應(yīng)</h1><div id="cvmdpqh" class="proBig"><div id="3bm3kb7" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038572759296/5736462.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="rkwnz2j" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038572759296/5736462.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="qzvhy7z" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>安徽華東師大音頻證書,音頻</p><p><span>***更新：</span>2021-01-12 00:26:34</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="3pamdja" 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(jī): </span>021-64458098</p><p><span>地址: </span>宜山路508號(hào)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="xq7ulh2" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="38hyfwn" class="box"><p><p style="text-indent:25px">我們注意一下身邊的CD片就會(huì)看到很多CD都有如：ADD、AAD、DDD等標(biāo)記。三個(gè)字母按順序各表示該片在音頻、編輯，安徽華東師大音頻證書、成品三個(gè)過程中所使用的方法，安徽華東師大音頻證書，是模擬(Analog)還是數(shù)字(Digital)。當(dāng)然A表示模擬，D表示數(shù)字。AAD就說明其音頻和編輯是用模擬方式的，而然后灌片是用數(shù)字方式的，這類唱片多是將過去錄制的音樂轉(zhuǎn)成CD片而不做任何修改，安徽華東師大音頻證書。ADD則是有一個(gè)修改過程。許多古典音樂大師的演奏或指揮多錄制于模擬時(shí)代，我們聽到的CD是經(jīng)過修改后灌錄的，很多這類唱片都有標(biāo)記ADD。而DDD的唱片必然是較現(xiàn)代的音頻品。自然，CD片必然以D結(jié)尾，而磁帶可以姑且認(rèn)為是AAA，雖然好像并沒有這種說法。長(zhǎng)期以來，計(jì)算機(jī)的研究者們一直低估了聲音對(duì)人類在信息處理中的作用。安徽華東師大音頻證書</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽華東師大音頻證書,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038572759296/5736462.png"></div><p style="text-indent:25px">音頻的格式：要在計(jì)算機(jī)內(nèi)播放或是處理音頻文件，也就是要對(duì)聲音文件進(jìn)行數(shù)、模轉(zhuǎn)換，這個(gè)過程同樣由采樣和量化構(gòu)成，人耳所能聽到的聲音，低的頻率是從20Hz起一直到高頻率20KHZ，20KHz以上人耳是聽不到的，因此音頻的大帶寬是20KHZ，故而采樣速率需要介于40~50KHZ之間，而且對(duì)每個(gè)樣本需要更多的量化比特?cái)?shù)。音頻數(shù)字化的標(biāo)準(zhǔn)是每個(gè)樣本16位(16bit，即96dB)的信噪比，采用線性脈沖編碼調(diào)制PCM，每一量化步長(zhǎng)都具有相等的長(zhǎng)度。在音頻文件的制作中，正是采用這一標(biāo)準(zhǔn)。南京上海戲劇學(xué)院音頻管理聲音的聲學(xué)特性如音的高低等都可以用計(jì)算機(jī)硬盤文件的方式儲(chǔ)存下來。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽華東師大音頻證書,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038302300296/8271801.png"></div><p style="text-indent:25px">拾音器的工作原理和分類：拾音器是一種把聲音信號(hào)轉(zhuǎn)換為電信號(hào)的換能器件。有聲學(xué)系統(tǒng)、機(jī)械系統(tǒng)和電學(xué)系統(tǒng)三部分組成。分類：（1）按換能原理分電容傳聲器、駐極體傳聲器、動(dòng)圈傳聲器、碳粒式傳聲器和壓電式傳聲器。（2）按聲波作用于膜片的不同方式分壓強(qiáng)式、壓差式和壓強(qiáng)壓差復(fù)合式。（3）按指向性分全指向性、雙指向性、單指向性和可變指向性。在音頻系統(tǒng)中阻抗匹配問題：電聲設(shè)備的連接中，對(duì)于前后級(jí)阻抗的處理方式有兩種，一種是阻抗匹配，一種是跨接的方式。阻抗匹配就是指前一級(jí)設(shè)備的輸出阻抗與后一級(jí)設(shè)備輸入阻抗相等。連接方式是基于大功率傳輸原理。 </p><p style="text-indent:25px">多普勒效應(yīng)：在傳輸系統(tǒng)中因聲源與聽者之間的有效距離隨時(shí)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(dòng)而產(chǎn)生的頻率變換效應(yīng)，稱之為多普勒效應(yīng)。倍頻程：人耳特別能夠察覺頻率為2：1的相關(guān)音響，這一比率關(guān)系是構(gòu)成音樂八度音程的基礎(chǔ)，音樂的八度音程在聲學(xué)上稱為倍頻程。聲壓：聲擾動(dòng)而產(chǎn)生的逾量壓強(qiáng)。逾量壓強(qiáng)=聲波存在時(shí)的壓強(qiáng)---沒有聲波時(shí)的壓強(qiáng)。單位為帕。聲壓級(jí)：表示聲壓的一個(gè)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(zhǔn)振幅的對(duì)數(shù)比例。動(dòng)態(tài)范圍：以分貝為單位，表示一個(gè)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。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="安徽華東師大音頻證書,音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038435708517/1254231.png"></div><p style="text-indent:25px">雙軌立體聲音頻和多軌立體聲音頻的區(qū)別：雙軌立體聲音頻采用一對(duì)立體聲話筒為主傳聲器，加若干輔助傳聲器的方式進(jìn)行音頻，因而傳聲器設(shè)置十分重要，音頻成敗很關(guān)鍵，后期混縮工作比較簡(jiǎn)單。多軌立體聲音頻采用多路傳聲器拾取信號(hào)，因而后期縮混成為音頻成敗的關(guān)鍵。雙軌立體聲音頻效果處理上采用自然效果，依靠聲場(chǎng)進(jìn)行加工，對(duì)聲場(chǎng)聲學(xué)條件要求高。多軌立體聲音頻采用近距離拾音，加人工混響的方式，因而對(duì)聲場(chǎng)要求不嚴(yán)格，通常采用強(qiáng)吸收短混響的音頻棚。生源方面，雙軌立體聲主要采用錄制傳統(tǒng)聲學(xué)樂隊(duì)，而多軌音頻多錄制流行音樂。聲波：聲音機(jī)械振動(dòng)引起周圍彈性媒質(zhì)發(fā)生波動(dòng)的現(xiàn)象。安徽華東師大音頻證書</p><p style="text-indent:25px">音頻不同采樣率、頻率、通道數(shù)之間的變換和轉(zhuǎn)換。安徽華東師大音頻證書</p><p style="text-indent:25px">高切濾波器：指家用音頻系統(tǒng)中濾除高頻的濾波器。高通濾波器：一種電子濾波器，高于某個(gè)頻率的信號(hào)可以通過這個(gè)濾波器，而低于的頻率信號(hào)被抑zhi。限幅器：用來使信號(hào)的振幅不超出大值的電子設(shè)備。參量均衡器：一種帶有增強(qiáng)功能的音頻均衡器，增強(qiáng)功能包括**均衡頻率調(diào)整、品質(zhì)因素調(diào)整以及和其他一樣增益衰減電平控制。打板器：由一個(gè)按鈕和指示燈組成，連接到一個(gè)電子振蕩器上，通常用于便攜式磁帶音頻機(jī)，以顯示畫面和聲音的同步點(diǎn)，用于同步聲音和畫面的工具。話筒車吊桿：將傳聲器舉在空中的一種器械，通過搖動(dòng)話筒桿臂，以及旋轉(zhuǎn)方向控制位于遠(yuǎn)端的傳聲器。報(bào)號(hào)軌：報(bào)號(hào)軌也是一種聲軌，通常在多聲軌的媒介上預(yù)先錄制好聲音，以引導(dǎo)樂師或其他音頻員保持畫面及其聲軌之間同步。安徽華東師大音頻證書</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2803086.html</p></div></div></div></div></div><div id="vofrsof" class="page-right twoColRt"><div id="t7sjar2" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="zxtarij" 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(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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