以文本方式查看主题

-  声学楼论坛  (http://nju520.com/bbs/index.asp)
--  软件应用及仿真室  (http://nju520.com/bbs/list.asp?boardid=2)
----  动圈式扬声器和话筒的曲线趋势调整方法  (http://nju520.com/bbs/dispbbs.asp?boardid=2&id=17605)

--  作者:Acoustics
--  发布时间:2009-12-3 17:07:03
--  动圈式扬声器和话筒的曲线趋势调整方法
看两个有意义的图.
--  作者:Acoustics
--  发布时间:2009-12-3 17:08:10
--  

图片点击可在新窗口打开查看此主题相关图片如下:loudspeakers.jpg
图片点击可在新窗口打开查看


--  作者:Acoustics
--  发布时间:2009-12-3 17:08:48
--  

图片点击可在新窗口打开查看此主题相关图片如下:microphone.jpg
图片点击可在新窗口打开查看

--  作者:Acoustics
--  发布时间:2009-12-3 17:27:05
--  

The mechanic tuning of the loudspeaker usually shifts the main resonance

to the low end of the transmitted frequency range. Spherical waves are predominately

emitted in this frequency range, and, below a limiting frequency

ω\', the real part of the radiation impedance, Zrad, increases proportional

to ω^2.

[此贴子已经被作者于2009-12-03 17:29:19编辑过]

--  作者:Acoustics
--  发布时间:2009-12-3 17:28:42
--  

Tuning the mechanic resonance to lower frequencies extends the range. The

acceleration, a, of the membrane should be constant to keep the radiated

power independent of frequency since |v^2| ~ 1/ω^2 means |a| = ω|v| = const.


--  作者:Acoustics
--  发布时间:2009-12-3 17:31:42
--  

Electric equalization using the techniques discussed here can overcome

the mechanic deficiencies of the loudspeaker, but be aware that very large

mechanic forces may be needed, reducing the power efficiency. Monitoring the

movement of the membrane with sensors and controlling the driving force

accordingly is called motional feedback and has been successful at reducing

distortions – particularly at the lower end of the frequency range.


--  作者:Acoustics
--  发布时间:2009-12-3 17:39:46
--  

图片点击可在新窗口打开查看此主题相关图片如下:microphone.jpg
图片点击可在新窗口打开查看

--  作者:Acoustics
--  发布时间:2009-12-3 17:42:29
--  

图片点击可在新窗口打开查看此主题相关图片如下:microphone with steerable directional.jpg
图片点击可在新窗口打开查看


--  作者:Acoustics
--  发布时间:2009-12-3 17:43:26
--  
可调指向性因子麦克风
--  作者:Acoustics
--  发布时间:2009-12-3 17:45:39
--  

图片点击可在新窗口打开查看此主题相关图片如下:electret microphone.jpg
图片点击可在新窗口打开查看

--  作者:Acoustics
--  发布时间:2009-12-3 17:49:49
--  

图片点击可在新窗口打开查看此主题相关图片如下:electromagnet with a movable armature.jpg
图片点击可在新窗口打开查看

--  作者:Acoustics
--  发布时间:2009-12-3 18:08:29
--  
公式和理论推导,就不贴了.

动铁的计算和仿真都是可行的.