Patent ID: 9510101
Filing Date: 2016-11-29
CPC Classification: H04R

Claim Text:
1. A system for providing temperature limiting for a voice coil of a speaker, comprising: an amplifier connected to the speaker, the amplifier configured for receiving an amplifier input signal, generating an amplifier output signal based upon the amplifier input signal and transmitting the amplifier output signal to the speaker; a sensing circuit connected to the amplifier, the sensing circuit configured for measuring a voltage and a current of the amplifier output signal and providing an output signal including a measured voltage and a measured current; a resistance estimator module including a processor, the resistance estimator module connected to the sensing circuit, the resistance estimator module configured for receiving the measured current and the measured voltage, calculating an estimated resistance of the voice coil based upon the measured voltage and the measured current by dividing a root mean square value of the measured voltage and the measured current, and providing an output including the estimated resistance; and a temperature estimator module connected to the resistance estimator module, the temperature estimator module being configured for receiving the resistance estimator module output and calculating a temperature of the voice coil based upon the estimated resistance, wherein the amplifier input signal is attenuated based upon a comparison of the calculated temperature of the voice coil against a pre-determined threshold temperature of the voice coil.