METHOD FOR DETERMINING AN IMPEDANCE OF AN ELECTROACOUSTIC TRANSDUCER AND FOR OPERATING AN AUDIO PLAYBACK DEVICE

摘要

A method for determining an impedance of an electroacoustic transducer (13) is provided. The electroacoustic transducer (13) is to be arranged in an ear channel of an ear (19) of a user. According to the method, an output signal is supplied to the electroacoustic transducer (13) and an input signal indicating an impedance of the electroacoustic transducer (13) in response to the supplied output signal is determined. A filtered output signal is generated by filtering the output signal with a bandpass filter having a predetermined frequency range. A filtered input signal is generated by filtering the input signal with a bandpass filter having the predetermined frequency range. Based on the filtered output signal and the filtered input signal the impedance (21, 22) of the electroacoustic transducer (13) is determined for the predetermined frequency range.