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发表于 2006-4-24 10:55:00
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<P 0cm 0cm 0pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: center" align=center><B>这也要卖钱???????????????????????????大家不要上当!!!!!!!!!!!!!!!!!以后看见此类骗钱的文章一律贴出来</B></P><P 0cm 0cm 0pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: center" align=center><B></B> </P><P 0cm 0cm 0pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: center" align=center><B>扬声器常用参数的物理意义</B><B><p></p></B></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman"> </FONT></p></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman"> </FONT></p></P><P 0cm 0cm 0pt">扬声器的参数是指采用专用的扬声器测试系统所测试出来的扬声器具体的各种性能参数值<FONT face="Times New Roman">.</FONT>其常用的参数主要包括<FONT face="Times New Roman">:Z,Fo,η0,
SPL,Qts,Qms,Qes,Vas,Mms,Cms,Sd,BL,Xmax,Gap gauss.</FONT>以下分别是这几种参数其物理意义<FONT face="Times New Roman">.
1.1 Z:</FONT>是指扬声器的电阻值<FONT face="Times New Roman">,</FONT>包括有<FONT face="Times New Roman">:</FONT>额定阻抗和直流阻抗<FONT face="Times New Roman">.(</FONT>单位<FONT face="Times New Roman">:</FONT>欧姆<FONT face="Times New Roman">/ohm),</FONT>通常指额定阻抗<FONT face="Times New Roman">.
</FONT>扬声器的额定阻抗<FONT face="Times New Roman">Z:</FONT>即为阻抗曲线第一个极大值后面的最小阻抗模值<FONT face="Times New Roman">,</FONT>即图<FONT face="Times New Roman">1</FONT>中点<FONT face="Times New Roman">B</FONT>所对应的阻抗值<FONT face="Times New Roman">.</FONT>它是计算扬声器电功率的基准<FONT face="Times New Roman">.
</FONT>直流阻抗<FONT face="Times New Roman">DCR:</FONT>是指在音圈线圈静止的情况下<FONT face="Times New Roman">,</FONT>通以直流信号<FONT face="Times New Roman">,</FONT>而测试出的阻抗值<FONT face="Times New Roman">.
</FONT>我们通常所说的<FONT face="Times New Roman">4</FONT>欧或者<FONT face="Times New Roman">8</FONT>欧是指额定阻抗<FONT face="Times New Roman">.
1.2 Fo(</FONT>最低共振频率<FONT face="Times New Roman">)</FONT>是指扬声器阻抗曲线第一个极大值对应的频率<FONT face="Times New Roman">.
</FONT>单位<FONT face="Times New Roman">:</FONT>赫兹<FONT face="Times New Roman">(Hz).
</FONT>扬声器的阻抗曲线图是扬声器在正常工作条件下<FONT face="Times New Roman">,</FONT>用恒流法或恒压法测得的扬声器阻抗模值随频率变化的曲线<FONT face="Times New Roman">.
1.3 η0(</FONT>扬声器的效率<FONT face="Times New Roman">):</FONT>是指扬声器输出声功率与输入电功率的比率<FONT face="Times New Roman">.
1.4 SPL(</FONT>声压级<FONT face="Times New Roman">):</FONT>是指喇叭在通以额定阻抗<FONT face="Times New Roman">1W</FONT>的电功率的电压时<FONT face="Times New Roman">,</FONT>在参考轴上与喇叭相距<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="1" UnitName="m"><FONT face="Times New Roman">1m</FONT></st1:chmetcnv>的点上产生的声压<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:</FONT>分贝<FONT face="Times New Roman">(dB).
1.5 Qts :</FONT>扬声器的总品质因数值<FONT face="Times New Roman">.
1.6 Qms:</FONT>扬声器的机械品质因数值<FONT face="Times New Roman">.
1.7 Qes:</FONT>扬声器的电品质因数值<FONT face="Times New Roman">.
1.8 Vas(</FONT>喇叭的有效容积<FONT face="Times New Roman">):</FONT>是指密闭在刚性容器中空气的声顺与扬声器单元的声顺相等时的容积<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:</FONT>升<FONT face="Times New Roman">(L).
1.9 Mms(</FONT>振动质量<FONT face="Times New Roman">):</FONT>是指扬声器在运动过程中参与振动各部件的质量总和<FONT face="Times New Roman">,</FONT>包括鼓纸部分<FONT face="Times New Roman">,</FONT>音圈<FONT face="Times New Roman">,</FONT>弹波以及参与振动的空气质量等<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:</FONT>克<FONT face="Times New Roman">(gram).
1.10 Cms(</FONT>力顺<FONT face="Times New Roman">):</FONT>是指扬声器振动系统的支撑部件的柔顺度<FONT face="Times New Roman">.</FONT>其值越大<FONT face="Times New Roman">,</FONT>扬声器的整个振动系统越软<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:</FONT>毫米<FONT face="Times New Roman">/</FONT>牛顿<FONT face="Times New Roman">(mm/N).
1.11 Sd(</FONT>振动面积<FONT face="Times New Roman">):</FONT>是指在扬声器的振动过程中<FONT face="Times New Roman">,</FONT>鼓纸<FONT face="Times New Roman">/</FONT>振膜的有效振动面积<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:</FONT>平方米<FONT face="Times New Roman">(m2).
1.12 BL(</FONT>磁力<FONT face="Times New Roman">):</FONT>间隙磁感应强度与有效音圈线长的乘积<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:(T*M).
1.13 Xmax:</FONT>音圈在振动过程中运动的线性行程<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:</FONT>毫米<FONT face="Times New Roman">(mm).
1.14 Gap Gauss:</FONT>间隙磁感应强度值<FONT face="Times New Roman">.</FONT>单位<FONT face="Times New Roman">:</FONT>特斯拉<FONT face="Times New Roman">(Tesla). </FONT></P> |
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