Abstract: A method used by a terminal to detect an earphone status and a terminal are disclosed. The method includes: disabling, by a processor, a path for outputting an audio signal to a second earphone; detecting electrical signals of a first audio output end and a third audio output end of a first earphone; and determining a frequency value of a low-frequency resonant point of the first earphone according to the electrical signals of the first audio output end and the third audio output end, and determining, according to the frequency value of the low-frequency resonant point, whether the first earphone is in an in-position state. In this way, only the electrical signals of the first audio output end and the third audio output end need to be detected, and it may be determined, according to changes of the electrical signals.

Abstract: A method used by a terminal to detect an earphone status and a terminal are disclosed. The method includes: disabling, by a processor, a path for outputting an audio signal to a second earphone; detecting electrical signals of a first audio output end and a third audio output end of a first earphone; and determining a frequency value of a low-frequency resonant point of the first earphone according to the electrical signals of the first audio output end and the third audio output end, and determining, according to the frequency value of the low-frequency resonant point, whether the first earphone is in an in-position state. In this way, only the electrical signals of the first audio output end and the third audio output end need to be detected, and it may be determined, according to changes of the electrical signals.

Abstract: The present disclosure provides an earphone power amplifier, including a ground contact connected to a ground wire of an earphone, a left sound channel power amplifying circuit connected to a left sound channel of the earphone, and a right sound channel power amplifying circuit connected to a right sound channel of the earphone. The left sound channel power amplifying circuit includes a first operational amplifier and a first positive feedback exported from an input end of the first ferrite bead to an in-phase input end of the first operational amplifier, the right sound channel power amplifying circuit includes a second operational amplifier and a second positive feedback exported from the input end of the first ferrite bead to an in-phase input end of the second operational amplifier.