Device and Method for Calculating Excursion of Diaphragm of Loudspeaker and Method for Controlling Loudspeaker
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United States of America
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Issued Date -
Sep 21, 2017
app pub date -
Feb 15, 2017
filing date -
Feb 15, 2017
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Abstract
A method for calculating excursion of a diaphragm of a loudspeaker is provided. The loudspeaker includes a diaphragm and is driven by a voltage signal. The method includes: a) low-pass filtering the voltage signal and a current signal inputted to the loudspeaker to generate a low-pass filtered voltage signal and a low-pass filtered current signal, respectively; b) calculating a direct-current (DC) resistance of the loudspeaker according to the low-pass filtered voltage signal and the low-pass filtered current signal; c) calculating a vibration velocity of the diaphragm according to the voltage signal, the current signal and the DC resistance; and d) calculating the excursion of the diaphragm according to the vibration velocity. Step (a) to step (d) involve real-number calculations.
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