Impedance detection apparatus for earphone plug

Abstract

An impedance detection apparatus for a headset plug, comprising: a headset socket unit (101), a headset socket (J1) of which is provided with a socket-end ground wire contact (GND) connected to a ground wire contact of a corresponding headset plug, and socket-end connecting contacts (L, R, MIC) correspondingly connected to other contacts of the headset plug; a voltage acquisition unit (103), comprising a first resistor (R1) connected between a positive electrode of a power supply (BT) and a contact access point (IN), a negative electrode of the power supply (BT) being connected to the socket-end ground wire contact (GND); a contact selection unit (102), comprising selection switches (LS1, LS2, LS3) which have one-to-one correspondence to the socket-end connecting contacts (L, R, MIC), each of the selection switches (LS1, LS2, LS3) being connected between the respective connecting contact and the contact access point (IN); a processing unit (104), used for calculating an impedance value of equivalent impedance between a selected connecting contact and the socket-end ground wire contact (GND) according to the voltage of the contact access point (IN) with respect to the socket-end ground wire contact (GND); and a display unit (105), used for displaying the calculated impedance value.

Dependencies are inferred from the claim text.