FIELD: wireless communications system.
SUBSTANCE: in the multiplexing circuit, the first switching circuit transmits the right channel audio signal from the right channel transmission output to the first internal transmission output; the second switching circuit transmits the left channel audio signal from the left channel transmission output to the second internal transmission output; after receiving the second turn-on voltage, but not receiving the first turn-on voltage, the decoupling circuit transmits the second turn-on voltage to the third switching circuit; and after receiving the first turn-on voltage and the second turn-on voltage, the decoupling circuit turns off the third switching circuit and decouples the earth terminal from the second turn-on voltage output; and the third switching circuit controls the connection between the first external transmission output and the first internal transmission output, and controls the connection between the second external transmission output and the second internal transmission output.
EFFECT: reduction of the charging current when using the headset while charging the mobile terminal.
15 cl, 14 dwg
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