| 摘要 |
Embodiments of the present invention provide a terminal and a system capable of reducing noise generated in a process of plugging or unplugging an earphone. The terminal includes: an earphone socket, a switch circuit, an earphone power supply circuit, and a bleeder circuit, where a first pin of the earphone socket is connected to a control pin of the switch circuit, a second pin of the earphone socket is connected to an input terminal of the switch circuit, a first output terminal of the switch circuit is connected to the earphone power supply circuit, and a second output terminal of the switch circuit is connected to the bleeder circuit; when an input voltage of the control pin of the switch circuit is higher than a second preset voltage value, the control pin of the switch circuit controls the input terminal of the switch circuit to be connected to the second output terminal of the switch circuit. According to the embodiments of the present invention, the switch circuit is added into the terminal, and when the input voltage of the control pin of the switch circuit is higher than the second preset voltage value, a connection between the earphone power supply circuit and the second pin of the earphone socket is disconnected. Therefore, a voltage on the earphone power supply circuit does not form a loop on an audio-left channel or an audio-right channel of the earphone, so that noise generated when the earphone is being plugged into or unplugged from the earphone socket is effectively reduced. |
