Device and method for estimating temperature of loudspeaker voice coil

A device for estimating the temperature of a loudspeaker's voice coil, comprising:

• a signal generator, configured to receive an audio signal and a measurement signal, generate and output an amplified signal to a loudspeaker according to the measurement signal and the audio signal, and sense a voltage and a current of the amplified signal to generate and output a sensory output;
• a signal adjuster, configured to receive the audio signal, and generate and output an inverted signal according to the audio signal;
• an adder, coupled to the signal generator and the signal adjuster to receive the sensory output and the inverted signal, respectively, configured to add the sensory output and the inverted signal to generate a blended signal;
• and
• a temperature estimator, coupled to the adder to receive the blended signal, configured to obtain an estimated resistance value of the loudspeaker's voice coil according to the blended signal, and generate a temperature signal according to the estimated resistance value, wherein the temperature signal indicates an estimated temperature value of the loudspeaker's voice coil.