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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3vr4ss9" 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>上師大音頻收費(fèi),音頻</p><p><span>***更新：</span>2021-01-29 09:14:09</p><p><span id="click" >瀏覽次數(shù)：3次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="xqs9jfe" 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="x2977ol" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="fjgfwdx" class="box"><p><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，上師大音頻收費(fèi)，這個(gè)過(guò)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，上師大音頻收費(fèi)，20KHz以上人耳是聽不到的，上師大音頻收費(fèi)，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)。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。上師大音頻收費(fèi)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上師大音頻收費(fèi),音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038515259363/9916345.png"></div><p style="text-indent:25px">頻程的含義：頻程又成頻帶。兩個(gè)聲或其他信號(hào)的頻率間的距離，是頻率的相對(duì)尺度。以高頻與低頻的率比的對(duì)數(shù)來(lái)表示。此對(duì)數(shù)通常以2為底，單位稱為倍頻程（oct）。也可以以10為底的對(duì)數(shù)表示，此時(shí)單位為10倍程（decede）。把20～20000HZ可聞聲頻率變化范圍劃分成的若干個(gè)較小的段落。通常劃分為10段頻程或30段頻程，也稱頻帶。立體聲擴(kuò)展技術(shù)原理：使一只揚(yáng)聲器的信號(hào)相對(duì)于另一只揚(yáng)聲器的作相移能引起聽覺幻想在一定程度上的擴(kuò)展，稱之為立體聲擴(kuò)展技術(shù)。相移度為0度時(shí)，產(chǎn)生定位在中間的幻想，為點(diǎn)聲源。相移為---135度時(shí)，聲像開始擴(kuò)大，為面聲源。相移度超過(guò)135度時(shí)，聲像開始分開，聲像不自然。相移度到達(dá)180度時(shí)，即產(chǎn)生“倒相”，定位完全含糊不清。南京南京藝術(shù)學(xué)院音頻收費(fèi)標(biāo)準(zhǔn)高切濾波器：指家用音頻系統(tǒng)中濾除高頻的濾波器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上師大音頻收費(fèi),音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038302300296/8271801.png"></div><p style="text-indent:25px">振幅：在特定的瞬間高于或低于坐標(biāo)零線的距離稱為該波形的振幅，而正或負(fù)向的大漂移則分別為正或負(fù)的峰值振幅。表示聲音單位的強(qiáng)弱。頻率：一秒鐘內(nèi)首尾銜接的周波數(shù)稱為波形的頻率，以赫茲（HZ）為計(jì)算單位，指每秒的周波數(shù)。與波長(zhǎng)和聲速有關(guān)。聲速：指聲波的傳播速度。在15度時(shí)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(shí)間相關(guān)的振幅變化。波形有簡(jiǎn)單波和復(fù)合波，簡(jiǎn)單波是因?yàn)樗鼈兪沁B續(xù)的和重復(fù)的，而且它們?cè)诹愣壬舷率峭耆珜?duì)稱的。復(fù)合波是很多波的組合，它們不需要重復(fù)，而且在零度上下也不需要對(duì)稱。</p><p style="text-indent:25px">音頻的屬性：大家都承認(rèn)是一個(gè)數(shù)碼時(shí)代，為追求優(yōu)良的音質(zhì)很多人做出了不懈的努力。隨著數(shù)碼時(shí)代的來(lái)臨，數(shù)字信號(hào)比模擬信號(hào)優(yōu)越已成為共識(shí)。什么是模擬信號(hào)？其實(shí)任何我們可以聽見的聲音經(jīng)過(guò)音頻線或話筒的傳輸都是一系列的模擬信號(hào)。模擬信號(hào)是我們可以聽見的。而數(shù)字信號(hào)就是用一堆數(shù)字記號(hào)(其實(shí)只有二進(jìn)制的1和0)來(lái)記錄聲音，而不是用物理手段來(lái)保存信號(hào)（用普通磁帶音頻就是一種物理方式）。我們實(shí)際上聽不到數(shù)字信號(hào)。這樣我們可以簡(jiǎn)略地比較一下模擬時(shí)代的音頻制作與數(shù)碼時(shí)代的區(qū)別：模擬時(shí)代是把原始信號(hào)以物理方式錄制到磁帶上（當(dāng)然在音頻棚里完成了），然后加工、剪接、修改，然后錄制到磁帶、LP等廣大聽眾可以欣賞的載體上。長(zhǎng)期以來(lái)，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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上師大音頻收費(fèi),音頻" src="https://tyunfile.71360.com/UploadFile/huaiyan/637414038167759356/6633536.png"></div><p style="text-indent:25px">回聲（殘響）：一個(gè)聲源的信號(hào)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。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(jī)信號(hào)，在還音過(guò)程中，白噪聲聽起來(lái)非常明亮，因?yàn)?0KHZ到20KHZ的高頻范圍內(nèi)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(jī)噪聲，利用粉紅噪聲以及實(shí)時(shí)頻譜分析儀可以測(cè)試聲音系統(tǒng)。衍射：指聲波有繞過(guò)或通過(guò)聲學(xué)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(dāng)聲音到達(dá)障礙物時(shí)會(huì)產(chǎn)生彎曲現(xiàn)象。擴(kuò)散：聲音遇到障礙物就會(huì)產(chǎn)生反射現(xiàn)象，良好的擴(kuò)散會(huì)產(chǎn)生平滑的混響聲，而不會(huì)產(chǎn)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。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?jiǎng)?chuàng)造的音響記錄下來(lái)。上師大音頻收費(fèi)</p><p style="text-indent:25px">要講音頻格式，CD自然是打頭陣的先鋒。上師大音頻收費(fèi)</p><p style="text-indent:25px">室內(nèi)條件下直達(dá)聲、近次反射聲、混響聲在人耳辨別空間感過(guò)程中的作用機(jī)理：從聲源到聽者直線傳播的聲音稱直達(dá)聲，直達(dá)聲決定了我們對(duì)聲源的方向、尺寸的感覺，并且攜帶聲源音色信息。直達(dá)聲到達(dá)之后50毫秒內(nèi)到達(dá)的聲音，只經(jīng)過(guò)小范圍的反射叫近次反射聲，直達(dá)聲開始到達(dá)與近次反射聲開始到達(dá)之間的時(shí)間為我們提供了關(guān)于房間尺寸的信息。遲于直達(dá)聲50毫秒以上的反射聲到達(dá)聽者時(shí)，經(jīng)過(guò)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(shí)間為我們提供了關(guān)于房間表面堅(jiān)硬程度的信息，而混響聲與直達(dá)聲之間的比例則能告訴我們與聲源之間的距離。上師大音頻收費(fèi)</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/3065276.html</p></div></div></div></div></div><div id="w3ykcog" class="page-right twoColRt"><div id="8btszl2" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="vzbqn88" 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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