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---- 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)
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-- 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.
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:08:10
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此主题相关图片如下:loudspeakers.jpg
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:08:48
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此主题相关图片如下:microphone.jpg
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:27:05
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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]
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:28:42
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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.
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:31:42
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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.
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:39:46
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此主题相关图片如下:microphone.jpg
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:42:29
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此主题相关图片如下:microphone with steerable directional.jpg
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:43:26
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可调指向性因子麦克风
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:45:39
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此主题相关图片如下:electret microphone.jpg
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-- 作者:Acoustics
-- 发布时间:2009-12-3 17:49:49
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此主题相关图片如下:electromagnet with a movable armature.jpg
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-- 作者:Acoustics
-- 发布时间:2009-12-3 18:08:29
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公式和理论推导,就不贴了.
动铁的计算和仿真都是可行的.
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