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style="float:left;margin-left:12px;line-height:25px;font-weight:bold;color:"> 文章正文 </div> <div style="float:right;margin-right:10px;display:none"> <a href="-1" style="line-height:25px;color:">更多</a> </div> </div> <div style="padding:0px"> <link href="../../news/templates/css/newscontent.css" rel="stylesheet" type="text/css" /> <script type=text/javascript src="../../news/js/newscontent.js"></script> <div id="newscontent"> <div class="newstitle">聲音的標尺：計權網絡，NR和NC那點事</div> <div class="info">作者：管理員發布于：2019-05-05 16:01:38 文字：【<a href="javascript:fontZoom(16)">大</a>】【<a href="javascript:fontZoom(14)">中</a>】【<a href="javascript:fontZoom(12)">小</a>】</div> <div id="memo" class="memo" style="display:none"><span style="color:#ff6600">摘要：</span></div> <div id="con" class="con"><p class="MsoNormal"> <span style="font-size:14px;">聽聲知悅，聽的是什么聲才能悅耳呢？有哪些評價量能夠用來評價聲音呢？讓我們隨著這一部聲學演義的卷章慢慢道來。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-size:14px;">A、C、Z計權聲級</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">標準等響曲線刻畫了我們聽覺系統隨頻率和強度變化的非線性特征，為了更好地反應噪聲測量結果與人耳聽覺反映的一致性，人們在</span><span style="font-size:14px;">40phon等響曲線的基礎上提出了A計權修正曲線，并將由此確定的聲級定義為A計權聲級（用dB(A)表示），A計權聲級被廣泛應用于噪聲的量度和評價中。雖然歷史上還曾經出現過B計權和D計權，但在IEC61672:2013中只定義了現在常用的三種計權A、C、Z計權。C計權以100phon的等響曲線為基礎，反應的是在較高聲級時人耳對低頻噪聲敏感性的提升。Z計權是Zero計權的簡寫，實際上是平直的不經過任何計權的意思。</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505155924_39163.png" alt="" /> </p> <p class="MsoNormal"> <span style="font-size:14px;"> 圖1 等響曲線及A計權曲線</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505155937_13633.png" alt="" /><span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-size:14px;"> 圖2 A、C和Z計權的修正量曲線</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505155949_98264.png" alt="" /> </p> <p class="MsoNormal"> <span style="font-size:14px;"> 表1 A計權的1/3倍頻程修正值數值表</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-size:14px;">A計權修正值可以通過以下的公式進行計算：</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505155959_23450.png" alt="" /> </p> <p class="MsoNormal"> <span style="font-size:14px;">或者：</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505160012_79801.png" alt="" /><span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">雖然</span><span style="font-size:14px;">A計權聲級至今仍被廣泛使用，但A計權聲級的局限性也是顯而易見的。其實，我們從等響曲線的變化中也可以看出，A計權曲線是根據1933年Fletcher和Munson獲得的等響曲線制定的，與現行的等響曲線有較大的差異。另一方面，眾多研究表明A計權聲級在評價低頻噪聲成分時與人的主觀感覺出現了較大偏差。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">從</span><span style="font-size:14px;">A計權和C計權的計權曲線的對比中可以看出，當噪聲低頻成分比較豐富時，則C計權聲級LC的值要大于A計權聲級LA的值；而當噪聲的頻譜成分以中高頻為主時，C計權聲級LC的值與A計權聲級LA的值就很接近。因此，C計權聲級LC和A計權聲級LA之差（即LC-LA）也往往被用來判斷噪聲的頻譜特征。國際上有很大一部分學者將兩者差值LC-LA>15dB作為將噪聲定義為低頻噪聲的判斷準則，并認為在LC-LA>15dB時用A計權聲級評價噪聲是不合適的。由此世界各國的學者提出了各種修正的評價參量，但沒有一個參量能獲得象A計權聲級這樣的廣泛認可。因此，采用A計權聲級有種“聊勝于無”的感覺。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">既然沒有一個更好的評價量出現，而低頻噪聲的評價又是那么重要，于是一些國家的噪聲法規中提出了對低頻噪聲的頻譜限值要求，作為對</span><span style="font-size:14px;">A計權聲級的補充。我國的GB 22337-2008等標準中也對低頻噪聲提出了特別限定要求。</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505160024_41283.png" alt="" /> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">圖</span><span style="font-size:14px;">3 歐洲一些國家提出的低頻噪聲限值</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-size:14px;">NR和NC曲線</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">對室內噪聲更加細致的控制參量一般采用</span><span style="font-size:14px;">NR或NC曲線，在歐美對產品的噪聲要求以及室內噪聲設計要求中被廣泛使用。NR曲線的英文全稱叫Noise Rating Curve（噪聲評價曲線），是ISO根據Kosten和van OS[1]的研究結果提出的噪聲評價曲線。</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505160033_70628.png" alt="" /> </p> <p class="MsoNormal"> <span style="font-size:14px;">NR曲線評價的一種方法就是將所測得的噪聲頻譜與NR曲線的標準頻譜對比，取與其相切的最大曲線值，并向上圓整到整數值，即為所測得噪聲頻譜的NR數。例如，測得如下表2的噪聲倍頻程頻譜值，將這些頻譜值畫在NR曲線圖中（如圖5），由此可以確定該噪聲與NR曲線最大相切點是2kHz處，對應圓整后的整數曲線值為58dB，所以我們說該噪聲滿足NR58的要求。</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505160040_14128.png" alt="" /> </p> <p class="MsoNormal"> <span style="font-size:14px;"> 表2 某噪聲的倍頻程頻譜</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505160048_61347.png" alt="" /><span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-size:14px;"> 圖5 圖線法進行NR曲線評價</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">由于</span><span style="font-size:14px;">NR曲線是由歐洲人提出的，因此NR曲線在歐洲國家被廣泛使用。而在美國卻主要采用Beranek提出的NC曲線[2-4]。NC曲線的英文全稱叫Noise Criterion Curve（噪聲評價數曲線）。對比NR和NC曲線可以發現， NR曲線的低頻到31.5Hz，而NC曲線低頻端僅到63Hz。著名聲學家Bies和Hansen[5]是這樣評述NC曲線的：“NC曲線是因應人居空間內的噪聲可接受程度評價而提出的。由于缺乏在31.5Hz處的定義，他并未能考慮低頻的轟轟聲 (rumble noise)；而他在2000Hz以及高頻處過于寬松，又使得在評價空調噪聲時，他與主觀反應的相關性不是太好?！?/span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505160116_64802.png" alt="" /> </p> <p class="MsoNormal"> <span style="font-size:14px;"> 圖6 NC評價曲線</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-size:14px;">NC曲線的評價方法與NR曲線是類似的。將表2中的數值去除31.5Hz的值后畫在NC曲線圖中，采用同樣的方法可以確定該噪聲符合NC57的要求。</span><o:p></o:p> </p> <p class="MsoNormal"> <img src="../../kindeditor/attached/image/20190505/20190505160130_28487.png" alt="" /><span style="font-size:14px;"></span> </p> <p class="MsoNormal"> <span style="font-size:14px;"> 圖7 圖線法進行NC曲線評價</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">為了彌補</span><span style="font-size:14px;">NC曲線在31.5Hz定義的缺失，Beranek在1989年又提出了平衡NC曲線，稱為NCB曲線 (Balanced NC Curve)[6]。在NCB曲線中，Beranek不僅把31.5Hz加了進去，而且索性進一步擴展到16Hz。但這似乎有點用力過猛的感覺，雖然Bies和Hansen在他們的經典之作中用了“NCB曲線大大超越了NC曲線”這樣的語句來贊美NCB曲線，但Beranek自己卻在書中[7]寫下這樣的語句：“NCB除了納入了ANSI標準中外，并未得到廣泛使用……, NCB曲線和NC曲線除了頻率范圍以外其實差異不大”。當然，作為進一步的彌補， Beranek也提出了與NR曲線頻段一致的PNC曲線 (Preferred NC Curve)，這個名字來自于標準中定義的聲學測量和評價的優選頻率 (Preferred Frequency)。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family: 宋體; font-size: 14px;">但至今，被廣泛使用的噪聲評價曲線仍然是</span><span style="font-size:14px;">NR和NC曲線，其它一些曲線也只能是匆匆過客。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-size:14px;"> </span> </p></div> <div id="contentpages"> </div> <div class="bzone"> <div class="down" style="display:none">附件下載：<span id="downlink"></span> (已下載0次) <span id="downcentnotice"></span><input type="hidden" id="downcent" value=""></div> <input type="hidden" id="newsid" value="468"> <div class="tags" style="display:none">標簽：</div> 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