Patent ID: 7554425

Claim:
An electromechanical transducer for transducing an electrical input signal into an electrical output signal, the electromechanical transducer comprising: a resonator element, an actuator for inducing an elastic deformation of the resonator element, the elastic deformation being dependent on the electrical input signal and being resonantly enhanced when the electrical input signal comprises a signal component changing substantially with a resonance frequency of the resonator element, the electrical output signal being a function of the elastic deformation, the resonance frequency including a nominal frequency at an operating temperature and a temperature dependent frequency deviation from the nominal frequency, a sensing element for providing an electrical sensing signal, the electrical sensing signal being a function of a temperature of the resonator element, and a heating element for heating the resonator element for reducing the temperature dependent frequency deviation to keep the resonance frequency substantially equal to the nominal frequency, the heating element being controlled by an electrical heating signal derived from the electrical sensing signal, and the heating element including at least a part of the sensing element.