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发表于 2006-3-1 19:40:35
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静电发声单元,一个经常被提到的词是constant charge
可以参考下面这一段
To ensure that the diaphragm maintains a constant charge at low frequencies, no significant current should flow in less than half the time period of the lowest frequency to be reproduced. Given a diaphragm with perfect conductivity and a transducer having capacitance C farads, and low frequency response to 27Hz, then the diaphragm must be fed via a resistance R ohms, such that:
RC > 1/(2 x 27) (approx.)
If C = 150pF (C= eA/d)
then R > 1 x 108 ohms.
However, R cannot be so high as to prevent the diaphragm from charging. |
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