FIELD: electronics.
SUBSTANCE: invention is related to electronic engineering. Method comprises connecting third pin with first pin via a first circuit, in which first circuit comprises a first unidirectional conduction module having a current direction of flowing to first pin; connecting third pin with second pin via a second circuit, in which second circuit comprises a second unidirectional conduction module having a current direction of flowing to second pin; controlling first unidirectional conduction module to turn on such that third pin and first pin form a first loop having an impedance matched with an identification resistance of mobile terminal; and controlling second unidirectional conduction module to turn on such that third pin and second pin form a second loop having an impedance matched with identification resistance of mobile terminal. This allows impedance of closed loop from output audio pin and earthing pin of audio interface to match with identification resistance of mobile terminal.
EFFECT: technical result is providing matching of mobile terminal with audio interface.
20 cl, 12 dwg
