Earphone recognition and connection methods and circuits and storage medium

An earphone connection method, the method comprising:

• upon detecting that an earphone is plugged, detecting a circuit state between a sound channel area of the earphone and an adjacent area of the sound channel area;
• when the circuit state between the sound channel area of the earphone and the adjacent area of the sound channel area is a short-circuit state, determining that the adjacent area of the sound channel area is a Ground (GND) area and another adjacent area of the GND area is a Microphone (MIC) area, and outputting a first indication signal to cause the GND area and MIC area of the earphone to be connected with a GND end and MIC end of a system respectively;
• and
• when the circuit state between the sound channel area of the earphone and the adjacent area of the sound channel area is an open-circuit state, determining that the adjacent area of the sound channel area is the MIC area and another adjacent area of the MIC area is the GND area, and outputting a second indication signal to cause the GND area and MIC area of the earphone to be connected with the GND end and MIC end of the system respectively.

An earphone recognition circuit, comprising:

• a detection power supply, a first resistor, a second resistor and a third resistor, wherein the detection power supply, the first resistor, the second resistor and the third resistor are sequentially connected in series, and the third resistor is grounded;
• a sound channel area of an earphone is connected to a circuit between the second resistor and the third resistor;
• an adjacent area of the sound channel area of the earphone is connected to a circuit between the first resistor and the second resistor;
• a resistance value of the second resistor is higher than a resistance value of the first resistor, and the resistance value of the first resistor is higher than a resistance value of the third resistor;
• the resistance value of the third resistor is higher than n times of impedance of the earphone;
• n is more than or equal to 10;
• and
• the earphone is determined to be of a first type when the circuit between the first resistor and the second resistor is at a low level, and the earphone is determined to be of a second type when the circuit between the first resistor and the second resistor is at a high level.

An earphone connection circuit, comprising:

• a detection circuit and a switching circuit, wherein the detection circuit comprises a detection power supply, a first resistor, a second resistor, a third resistor and an indication signal output line, wherein
• the detection power supply, the first resistor, the second resistor and the third resistor are sequentially connected in series, and the third resistor is grounded;
• a sound channel area of an earphone is connected to a circuit between the second resistor and the third resistor;
• an adjacent area of the sound channel area of the earphone is connected to a circuit between the first resistor and the second resistor;
• a resistance value of the second resistor is higher than a resistance value of the first resistor, and the resistance value of the first resistor is higher than a resistance value of the third resistor;
• the resistance value of the third resistor is higher than n times of impedance of the earphone;
• n is more than or equal to 10;
• the switching circuit comprises an indication signal receiving line, a first switch and a second switch;
• one end of the first switch is connected with a Ground (GND) end of a system, and other ends of the first switch are connected with a Microphone (MIC) area and GND area of the earphone respectively;
• one end of the second switch is connected with a MIC end of the system, and other ends of the second switch are connected with the MIC area and GND area of the earphone respectively;
• one end of the indication signal output line is connected to the circuit between the first resistor and the second resistor, another end of the indication signal output line is connected with an input end of the indication signal receiving line, and an output end of the indication signal receiving line is connected with the first switch and the second switch respectively;
• when the circuit between the first resistor and the second resistor is at a low level, it is determined that the adjacent area of the sound channel area is the GND area and another adjacent area of the GND area is the MIC area, the indication signal output line outputs a low level signal to the indication signal receiving line, and the low level signal controls the first switch to gate the GND end of the system and the GND area of the earphone and controls the second switch to gate the MIC end of the system and the MIC area of the earphone;
• and when the circuit between the first resistor and the second resistor is at a high level, it is determined that the adjacent area of the sound channel area is the MIC area and another adjacent area of the MIC area is the GND area, the indication signal output line outputs a high level signal to the indication signal receiving line, and the high level signal controls the first switch to gate the GND end of the system and the GND area of the earphone and controls the second switch to gate the MIC end of the system and the MIC area of the earphone.