Earphone in-place detection circuit and detection method

Abstract

The invention provides an earphone in-place detection circuit and a detection method. The circuit comprises a main processor, an audio processor, an earphone in-place detection circuit, a microphone signal line, a left channel signal line, a right channel signal line and a key signal line, the earphone in-place detection circuit comprises a comparator, a first resistor, a second resistor, a thirdresistor and a fourth resistor, a microphone signal line is connected with one end of a magnetic bead, and a key signal line is connected with a GPIO port of the main processor; the left channel signal line is connected with a left channel port of the audio processor, and the right channel signal line is connected with a right channel port of the audio processor. A microphone signal line, a key signal line, a first sound channel signal line and a second sound channel signal line are respectively connected with a first capacitor, a second capacitor, a third capacitor and a fourth capacitor which are grounded, so that high-frequency interference introduced from the outside is suppressed; and grounded transient voltage suppression diodes are respectively connected to prevent static electricity from damaging the signal interface.

Description

technical field [0001] The invention relates to the technical field of electronic equipment, in particular to an earphone presence detection circuit and a detection method. Background technique [0002] In many mobile communication devices, a 3.5mm standard earphone plug is used as the form of the earphone interface. For the common four-stage 3.5mm headphone socket structure, the detection of the plug-in and pull-out of the commonly used headphones is mainly realized by the state of the reed inside the headphone socket. like figure 1 and figure 2 As shown, the insertion and removal of the earphone will cause the connection state between the detection signal HP_DET and the left channel HPH_L of the earphone to change, and then the level state on the detection signal HP_DET will change, thereby identifying the insertion and removal of the earphone . The prior art also provides a detection circuit. Although the state of the reed inside the headphone socket is no longer use...

AI Technical Summary

Problems solved by technology

Although this makes the interface easy to clean, it will also increase the reliability of the headphone jack, but on the other hand, it will cause misidentification of the earphones during the connection process, as well as serious popping sound problems.

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