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15:16:57</span> </p> </div> <div id="i8pjzty" class="news-detail-view"> <p>　　把電信號(hào)修正為與聽感近似值的網(wǎng)絡(luò)，這種網(wǎng)絡(luò)叫作計(jì)權(quán)網(wǎng)絡(luò)。通過(guò)計(jì)權(quán)網(wǎng)絡(luò)測(cè)得的聲壓級(jí)，已不再是客觀物理量的聲壓級(jí)(叫線性聲壓級(jí))，而是經(jīng)過(guò)聽感修正的聲壓級(jí)，叫作計(jì)權(quán)聲級(jí)或噪聲級(jí)。</p><p style="text-align: center;"><img src="/Public/Uploads/image/20210603/1622704379543147.jpg" title="1622704379543147.jpg" alt="什么是聲級(jí)計(jì)的計(jì)權(quán).jpg"/></p><p>　　計(jì)權(quán)，又叫加權(quán)，參數(shù)是在對(duì)頻響曲線進(jìn)行了一些加權(quán)處理后測(cè)得的參數(shù)，以區(qū)別于平直頻響狀態(tài)下的不計(jì)權(quán)參數(shù)。例如信噪比，按照定義，我們?cè)陬~定的信號(hào)電平下測(cè)出噪聲電平(可以是功率，也可以是電壓、電流)，額定電平與噪聲電平之比就是信噪比，如果是分貝值，則計(jì)算二者之差。這是不計(jì)權(quán)信噪比。不過(guò)，由于人耳對(duì)噪聲的感知能力是不一樣的，對(duì)500Hz左右的中頻感覺好，高頻則差一些，因此不計(jì)權(quán)信噪比未必與人耳對(duì)噪聲大小的主觀感覺能很好的吻合。</p><p>　　如何將測(cè)量值與主觀聽感統(tǒng)一起來(lái)呢?于是就有了均衡網(wǎng)絡(luò)，或者叫加權(quán)網(wǎng)絡(luò)，對(duì)高頻加以適度的衰減，這樣中頻便更突出。把這種加權(quán)網(wǎng)絡(luò)接在被測(cè)器材和測(cè)量?jī)x器之間，于是器材中頻噪聲的影響就會(huì)被該網(wǎng)絡(luò)“放大”，換言之，對(duì)聽感影響*大的中頻噪聲被賦予了更高的權(quán)重，此時(shí)測(cè)得的信噪比就叫計(jì)權(quán)信噪比，它可以更真實(shí)地反映人的主觀聽感。</p><p>　　根據(jù)所使用的計(jì)權(quán)網(wǎng)不同，分別稱為 A 聲級(jí)、 B 聲級(jí)和 C 聲級(jí)。A 計(jì)權(quán)聲級(jí)是模擬人耳對(duì) 55dB 以下低強(qiáng)度噪聲的頻率特性， B 計(jì)權(quán)聲級(jí)是模擬 55dB 到 85dB 的中等強(qiáng)度噪聲的頻率特性， C 計(jì)權(quán)聲級(jí)是模擬高強(qiáng)度噪聲的頻率特性。三者的主要差別是對(duì)噪聲高頻成分的衰減程度， A 衰減*多， B 次之， C *少。</p><p>　　但由于A計(jì)權(quán)所依據(jù)的等響曲線經(jīng)過(guò)多次修正后發(fā)生了很大的變化，A計(jì)權(quán)的地位也正逐漸下降。</p><p><br/></p> </div> </div> </div> </div> </div> <div id="i8pjzty" class="news-aggregate-sd"> <div id="i8pjzty" class="xwtji"> <div id="i8pjzty" class="panel-hd"><span>產(chǎn)品推薦</span></div> <div id="i8pjzty" class="panel-xwtj"> <ul class="news-xiw"> <li><a href="/p-11411.html">HY106型個(gè)人聲暴露計(jì)</a> </li><li><a href="/p-11410.html">德國(guó)MAHR(馬爾) MARSURF PS10/PS 10 C2表面粗糙度測(cè)量?jī)x</a> </li><li><a href="/p-11409.html">英國(guó)Burkard Hirst 孢子采樣</a> </li><li><a href="/p-11408.html">LabSen241-3S微量玻璃pH電極</a> </li><li><a href="/p-11407.html">LabSen751鈦合金食品穿刺pH電極</a> </li><li><a href="/p-11406.html">LabSen241-NMR核磁管微量pH電極</a> </li> </ul> </div> </div> <div id="i8pjzty" class="xwtji"> <div id="i8pjzty" class="panel-hd"><span>儀器資訊</span></div> <div id="i8pjzty" class="zx_xzun"> <ul class="zxzx_xwi"> <li><a href="/news-739.html">秋冬季節(jié)靜電防不勝防，這些儀器或許可以派上用場(chǎng) </a> </li><li><a 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