Device and method for generating driving signal of loudspeaker

A device for generating a driving signal of a loudspeaker comprising:

• a driving circuit, coupled to said loudspeaker, and receiving a control signal to generate a driving voltage;
• a current sensing unit, coupled to said loudspeaker, and measuring a current flowing through said loudspeaker to generate a current signal;
• a displacement calculating unit, coupled to said current sensing unit, calculating to derive a back-emf value according to said driving voltage, said current signal and the electrical impedance of said loudspeaker, and integrating said back-emf value to derive an integrating value;
• and
• a signal processing unit, coupled to said displacement calculating unit and said driving circuit, receiving an audio signal to generate said control signal, and manipulating said control signal according to said integrating value to perform protection on said loudspeaker.