[err:数据源标签'PE.DataSource id="cone" datasource="资料_内容页" itemId="602" xslt="true" '返回数据错,原因:名称中不能包含“<”字符(十六进制值 0x3C)。 行 49,位置 16。,源码:602 <meta http-equiv="refresh" content="0;url=/Item/602.aspx?wu=1" /> 27听觉0.00B0.00Botherczwlzx课改组czwlzx/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?id=602"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=dayhits&id=602"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=weekhits&id=602"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=monthhits&id=602"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetBrowseTimes.aspx?id=602"></script> <img src="/images/star3.jpg" /> 课改组0声,耳,听觉课改组2004年11月20日/UploadFiles/nopic.gif 双耳是人的听觉器官,它非常灵敏.人的听觉能感受到的最小声压已接近于空气中分子热运动所产生的声压,能感双耳是人的听觉器官,它非常灵敏.人的听觉能感受到的最小声压已接近于空气中分子热运动所产生的声压,能感受的频率范围约为20Hz~20 000Hz,宽达十个倍频程(即十个“八度”).人耳能感受的强度范围约为10-12W·m-2~1W·m-2,大小相差1012倍. 1.级和分贝 在声学中声音的强度或压力常用级来表示,它的单位是dB(分贝).这样上面说到的人耳能听到的最小的声音与最大声音之间强度相差1012倍,也就是声级相差120dB. 2.响度和响度级 一个声音在听觉感受上有多响,并不与这个声音的物理强度成线性关系.所以在普通声学中,除了有一套物理量之外,与之对应的还有一套心理量,用以表示声音在主观感受上的程度.一个声音有多响除了与 【内容简介】双耳是人的听觉器官,它非常灵敏.人的听觉能感受到的最小声压已接近于空气中分子热运动所产生的声压,能感受的频率范围约为20Hz~20 000Hz,宽达十个倍频程(即十个“八度”).人耳能感受的强度范围约为10-12W·m-2~1W·m-2,大小相差1012倍. 1.级和分贝 在声学中声音的强度或压力常用级来表示,它的单位是dB(分贝).这样上面说到的人耳能听到的最小的声音与最大声音之间强度相差1012倍,也就是声级相差120dB. 2.响度和响度级 一个声音在听觉感受上有多响,并不与这个声音的物理强度成线性关系.所以在普通声学中,除了有一套物理量之外,与之对应的还有一套心理量,用以表示声音在主观感受上的程度.一个声音有多响除了与它的强度大小有关外,还与它的频率高低有关.根据世界上许多国家对不同种族的大量正常人所测得的响度级与声压级和频率的关系,称为等响曲线,示于下图 图3-2-2 响度级的单位是phon(双耳是人的听觉器官,它非常灵敏.人的听觉能感受到的最小声压已接近于空气中分子热运动所产生的声压,能感受的频率范围约为20Hz~20 000Hz,宽达十个倍频程(即<P><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG></STRONG></SPAN><SPAN lang=EN-US style="COLOR: black"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">双耳是人的听觉器官,它非常灵敏.人的听觉能感受到的最小声压已接近于空气中分子热运动所产生的声压,能感受的频率范围约为</SPAN><SPAN lang=EN-US style="COLOR: black">20Hz</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">~</SPAN><SPAN lang=EN-US style="COLOR: black">20 000Hz</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,宽达十个倍频程</SPAN><SPAN lang=EN-US style="COLOR: black">(</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">即十个“八度”</SPAN><SPAN lang=EN-US style="COLOR: black">)</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">.人耳能感受的强度范围约为</SPAN><SPAN lang=EN-US style="COLOR: black">10<SUP>-12</SUP>W</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">·</SPAN><SPAN lang=EN-US style="COLOR: black">m<SUP>-2</SUP></SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">~</SPAN><SPAN lang=EN-US style="COLOR: black">1W</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">·</SPAN><SPAN lang=EN-US style="COLOR: black">m<SUP>-2</SUP></SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,大小相差</SPAN><SPAN lang=EN-US style="COLOR: black">10<SUP>12</SUP></SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍.</SPAN><SPAN lang=EN-US style="COLOR: black"><o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"><SPAN style="mso-spacerun: yes"> </SPAN>1</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">.级和分贝</SPAN><SPAN lang=EN-US style="COLOR: black"><o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"><SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在声学中声音的强度或压力常用级来表示,它的单位是</SPAN><SPAN lang=EN-US style="COLOR: black">dB(</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分贝</SPAN><SPAN lang=EN-US style="COLOR: black">)</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">.这样上面说到的人耳能听到的最小的声音与最大声音之间强度相差</SPAN><SPAN lang=EN-US style="COLOR: black">10<SUP>12</SUP></SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍,也就是声级相差</SPAN><SPAN lang=EN-US style="COLOR: black">120dB</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">.</SPAN><SPAN lang=EN-US style="COLOR: black"><o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"><SPAN style="mso-spacerun: yes"> </SPAN>2</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">.响度和响度级</SPAN><SPAN lang=EN-US style="COLOR: black"><o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一个声音在听觉感受上有多响,并不与这个声音的物理强度成线性关系.所以在普通声学中,除了有一套物理量之外,与之对应的还有一套心理量,用以表示声音在主观感受上的程度.一个声音有多响除了与它的强度大小有关外,还与它的频率高低有关.根据世界上许多国家对不同种族的大量正常人所测得的响度级与声压级和频率的关系,称为等响曲线,示于下图</SPAN><SPAN lang=EN-US style="COLOR: black"><o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shape id=_x0000_s1029 style="MARGIN-TOP: 8.7pt; Z-INDEX: 2; LEFT: 0px; MARGIN-LEFT: 54pt; WIDTH: 302.3pt; POSITION: absolute; HEIGHT: 226.2pt; TEXT-ALIGN: left" coordsize="21600,21600" type="#_x0000_t75"><v:imagedata src="./u32.files/image003.jpg" o:title="图5-4"></v:imagedata></v:shape><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P><BR style="mso-ignore: vglayout" clear=all> </P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"><SPAN style="mso-spacerun: yes"> </SPAN><o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal><SPAN lang=EN-US style="COLOR: black"><SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>图3-2-2<o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"><SPAN lang=EN-US style="COLOR: black"> <o:p></o:p></SPAN></P> <P class=MsoNormal style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">响度级的单位是</SPAN><SPAN lang=EN-US style="COLOR: black">phon(</SPAN><SP不限 <img src="/images/nopic.gif" alt="%e5%90%ac%e8%a7%89" border="0" /> /UploadFiles/] {PE.Field id="cone" fieldname="Title" /}-初中物理教师网 {PE.Field id="cone" fieldname="gourl" /} {PE.Label id="顶部" currentId="{PE.Field id="cone" fieldname="NodeID" /}"/}

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