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Control of the Audio Signal Using Thermal Parameter for Protection of the Voice Coil

This engineering brief presents a procedure for a signal processing method to protect a voice coil from overheating. The basic concept is that of estimating temperature of the voice coil with heat transfer model and controlling the output level before the voice coil is burnt. This paper mainly focuses on the calculation method and various considerations in level control. A basic heat transfer model and a commonly used method in calculation of the thermal parameters are introduced.

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