Status detection device for audio interface

Abstract

A state detection device and state detection method for an audio interface, the state detection device comprising: a first voltage detection circuit, a second voltage detection circuit and a state judgment circuit. The first voltage detection circuit is coupled to a first contact and a second contact of an audio connector socket, and is used to detect the cross-voltage between the first contact and the second contact, thereby generating a first detection value. The second voltage detection circuit is coupled to a third contact of the audio connector socket, and is used to detect the voltage on the third contact, thereby generating a second detection value. The state judgment circuit is used to judge a water ingress state of the audio connector socket according to the first detection value, and to judge a connector type of an audio connector inserted into the audio connector socket according to the second detection value.

Description

Technical Field

[0001] The present invention relates to an audio interface, and in particular to a state detection circuit for detecting a connector type of an audio peripheral device and a water ingress state of a connector socket in the audio interface. Background Art

[0002] Many electronic devices have the function of connecting to external audio peripherals. For example, mobile phones, tablet computers, laptops, etc. can be connected to audio peripherals such as headphones, speakers, and headsets. Such audio peripherals are usually connected to electronic devices via connector elements such as connectors and sockets. For example, many headphones have a 3.5mm audio connector for connecting to a 3.5mm audio connector socket on an electronic device.

[0003] Generally, in use, electronic devices usually use some detection mechanisms to detect whether the audio connector has been inserted into the audio connector socket. Based on this, the electronic device can make some corresponding controls, such as interrupting or starting audio playback, switching the audio playback device from the built-in speaker to an external audio peripheral device, or avoiding popping sounds caused by plugging and unplugging the audio connector. On the other hand, when moisture enters the audio connector socket, the contacts of the audio connector socket may be conductive, which will further cause the electronic device to misjudge the insertion of the audio connector, making it impossible for the electronic device to correctly control audio playback or switch between the built-in speaker and the external audio peripheral device when the audio connector is inserted or unplugged.

[0004] On the other hand, 3.5mm audio connectors are usually of two types: two-ring three-pole type (TRS type) and three-ring four-pole type (TRRS type). The two-ring three-pole type 3.5mm audio connector can be used to transmit two-channel (for example, left and right channels) analog audio signals, while the three-ring four-pole type 3.5mm audio connector can transmit a mono microphone signal in addition to two-channel analog audio signals. In addition, the three-ring four-pole type 3.5mm audio connector is also divided into CTIA type and OMTP type according to different electrode definitions. Since these different types of 3.5mm audio connectors are quite common in use, electronic devices also need to correctly identify the specific connector type, so as to correctly control external audio peripherals and identify the signal corresponding to each electrode of the audio connector. Summary of the invention

[0005] In view of this, the present invention provides a state detection circuit for detecting the connector type of an audio peripheral device and the water ingress status of a connector socket in an audio interface. The embodiment of the present invention determines whether water has entered the audio connector socket by detecting the cross-voltage between the two contacts on the socket connected to the first pole of the audio connector; if it is determined that water has not entered, it is determined that the conductor currently entering the connector socket is an audio connector. Accordingly, the embodiment of the present invention determines the type of audio connector and the audio peripheral device to which it belongs by detecting the voltage on the contact on the socket connected to the fourth pole of the audio connector. Since the present invention does not use additional contacts for state detection, it is suitable for existing audio connector sockets, and can also provide detection of multiple connector types and water ingress status of the socket at the same time.

[0006] One embodiment of the present invention provides a state detection device for an audio interface. The state detection device includes: a first voltage detection circuit, a second voltage detection circuit, and a state judgment circuit. The first voltage detection circuit is coupled to a first contact and a second contact of an audio connector socket to detect the cross-voltage between the first contact and the second contact, thereby generating a first detection value. The second voltage detection circuit is coupled to a third contact of the audio connector socket to detect the voltage on the third contact, thereby generating a second detection value. The state judgment circuit is coupled to the first voltage detection circuit and the second voltage detection circuit to determine a water ingress state of the audio connector socket according to the first detection value, and a connector type of at least an audio connector inserted into the audio connector socket according to the second detection value.

[0007] An embodiment of the present invention provides a state detection method for an audio interface. The method comprises: detecting a cross-voltage between a first contact and a second contact of an audio connector socket, thereby generating a first detection value; detecting a voltage on a third contact of the audio connector socket, thereby generating a second detection value; judging a water ingress state of the audio connector socket according to the first detection value; and judging a connector type of an audio connector inserted into the audio connector socket according to the second detection value. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1A A schematic diagram showing the architecture of a state detection circuit and its application according to an embodiment of the present invention.

[0009] Figure 1B The audio connector types and related audio peripheral devices that can be identified by the embodiment of the present invention are shown.

[0010] Figure 2A and Figure 2B It shows how the present invention detects the water inflow state.

[0011] Figure 3Explain how the first detection value and the second detection value in the embodiment of the present invention change with the water ingress status and the audio connector type.

[0012] Figure 4 It shows how the present invention detects the water inflow state.

[0013] Figure 5 A state detection flow chart in an embodiment of the present invention is shown.

[0014] Explanation of symbols

[0015] 10 Audio Interface

[0016] 100 Status detection device

[0017] 110 first voltage detection circuit

[0018] 120 Second voltage detection circuit

[0019] 130 Status judgment circuit

[0020] 140 Insertion detection circuit

[0021] 200 Audio Connector

[0022] 211~214 First pole~Fourth pole

[0023] 300 Audio Connector Female

[0024] 311~315 contacts

[0025] 400 Sound Amplification Equipment

[0026] 500 Sound pickup equipment

[0027] 600 extension cord

[0028] Rc1, Ra1, Ra2, Ra3 resistors

[0029] RL, RW, RH, Rm equivalent impedance

[0030] VDD1, VDD2 voltage

[0031] GND Ground voltage DETAILED DESCRIPTION

[0032] In the following text, many specific details are described to provide readers with a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand how to implement the present invention without one or more specific details, or using other methods, elements, materials, etc. In other cases, well-known structures, materials, or operations will not be shown or described in detail to avoid obscuring the core concepts of the present invention.

[0033] The reference to "an embodiment" in the specification means that the specific features, structures or characteristics described in the embodiment may be included in at least one embodiment of the present invention. Therefore, the "in an embodiment" that appears in various places in this specification does not necessarily mean the same embodiment. In addition, the aforementioned specific features, structures or characteristics may be combined in one or more embodiments in any suitable form.

[0034] Figure 1A The state detection circuit 100 of an embodiment of the present invention and its application schematic diagram are shown. The state detection device 100 of the present invention can be used in an audio interface 10 to detect whether an audio jack 200 is inserted into the audio jack socket 300, the type of the audio jack 200, whether the audio jack socket 300 is flooded, and other states. The audio interface 10 can be a sound card or sound processing system in an electronic device (such as a mobile phone, a personal computer, a tablet computer, a laptop computer, a multimedia player), etc., wherein the audio interface 10 may also include (not shown) a power amplifier, a digital / analog converter, a digital audio processor, etc. The audio connector 200 can be a two-ring three-pole type (such as a TRS type), including a first pole 211, a second pole 212, and a third pole 213; or a three-ring four-pole type (such as a TRRS type), which includes a first pole 211, a second pole 212, a third pole 213, and a fourth pole 214. Figure 1B As shown, the audio connector 200 is a part of an audio peripheral device. For example, the two-ring three-pole audio connector 200 can be connected to a sound amplification device 400 such as an earphone (as shown in the figure) or a speaker through a wire, while the three-ring four-pole audio connector 200 can be further connected to a sound pickup and sound amplification integrated device 500 such as an integrated earphone and a microphone; or, the audio connector 200 can be a three-ring four-pole male connector of an audio extension cable 600. Furthermore, generally speaking, when the audio connector 200 is a two-ring three-pole type, the first pole 211 is used to receive the left channel audio signal generated by the audio interface 10 and transmit it to the sound amplification device 400, the second pole 212 is used to receive the right channel audio signal generated by the audio interface 10 and transmit it to the sound amplification device 400, and the third pole 213 is a ground terminal. When the audio connector 200 is a three-ring four-pole type, the first pole 211 is used to receive the left channel audio signal generated by the audio interface 10 and transmit it to the sound amplifier in the sound pickup and sound amplification integrated device 500, and the second pole 212 is used to receive the right channel audio signal generated by the audio interface 100 and transmit it to the sound amplifier in the sound pickup and sound amplification integrated device 500; one of the third pole 213 and the fourth pole 214 is a ground terminal, and the other is used to transmit the microphone signal generated by the sound pickup device in the sound pickup and sound amplification integrated device 500 to the audio interface 10.

[0035] Please refer again Figure 1AThe state detection device 100 of the present invention is coupled to a plurality of conductive contacts in the audio connector female socket 300, and these conductive contacts at least include contacts 311, contacts 312, contacts 313, contacts 314, and contacts 315. When the audio connector 200 is a two-ring three-pole type, the contact 311 in the audio connector female socket 300 (shown in the figure at the innermost upper end of the female socket) is connected to the first pole 211 of the audio connector 200 for conducting the left channel audio signal. The contact 312 (shown in the figure at the outer upper end of the female socket) is connected to the second pole 212 of the audio connector 200 for conducting the right channel audio signal. The contact 313 (shown in the figure at the outer lower end of the female socket, but staggered with the position of the contact 312) is connected to the third pole 213 of the audio connector 200, and is also coupled to a ground voltage GND. The contact 314 (shown in the outermost ring of the female socket in the figure) is also connected to the third pole 213 of the audio connector 200. In addition, when the audio connector 200 is a three-ring four-pole type, in addition to the contacts 311-313 of the audio connector female socket 300 being respectively connected to the first to third poles 211-213 of the audio connector 200, the contact 314 of the audio connector female socket 300 is connected to the fourth pole 214 of the audio connector 200 for conducting microphone signals. Furthermore, the contact 315 in the audio connector female socket 300 (shown in the figure at the innermost part of the lower end of the audio connector female socket 300, corresponding to the position of the contact 311) is used to connect to the first pole 211 of the audio connector 200.

[0036] The state detection device 100 includes a first voltage detection circuit 110, a second voltage detection circuit 120, and a state determination circuit 130. In one embodiment, the first voltage detection circuit 110 and the second voltage detection circuit 120 can be analog-to-digital converters (ADCs), respectively. The first voltage detection circuit 110 is coupled to the contact 311 of the audio connector socket 300 and is coupled to the contact 315 through a voltage divider circuit 150, and is coupled to the first pole 211 of the audio connector 200 when the audio connector 200 is inserted and connected to the audio connector socket 300. The second voltage detection circuit 120 is coupled to the contact 314 of the audio connector socket 300, and the input end of the second voltage detection circuit 120 is selectively connected to a voltage VDD2 through a pull-up resistor Ra3. Furthermore, when the audio connector 200 is inserted and connected to the audio connector socket 300, it is coupled to the third pole 213 (when the audio connector 200 is a two-ring three-pole type) or the fourth pole 214 (when the audio connector 200 is a three-ring four-pole type) of the audio connector 200.

[0037] Please refer to Figure 1A as well as Figure 2AWhen the audio connector 200 is inserted into the audio connector socket 300, the impedance RL between the contact 311 and the contact 315 is approximately equal to the impedance of the first pole 211 of the audio connector 200, such as the impedance of the first pole 211 of the sound amplifier 400 or the sound amplifier and pickup integrated device 500, or the audio extension cable 600, which usually falls within the range of 0 to 1.1K ohms. Figure 2B As shown, once water enters the audio connector socket 300 and the water fills the hollow space of the audio connector socket 300, the impedance RL between the contact 311 and the contact 315 will become the impedance RW of water. As the impedances of salt water and fresh water are different (the impedance of salt water will change over time), the range of the impedance RW will fall within the range of 2K to 2M ohms. The voltage value sampled by the first voltage detection circuit 110 coupled to the contact 311 and the contact 315 will also change accordingly. Therefore, the state judgment circuit 130 in the state detection device 100 can determine whether water has entered the audio connector socket 300 based on the first detection value DET1 output by the first voltage detection circuit 110. As Figure 3 It is shown that when the voltage VDD1 of the state detection device 100 is 3.3V, the voltage VDD2 is 3.3V, the resistor Ra3 is 1.2K ohms, and the resistor Rc1 of the voltage divider circuit 150 is 100K ohms, the resistor Ra1 is 1M ohms, and the resistor Ra2 is 850K ohms, various states and types of audio connectors 200 lead to changes in the first detection value DET1 sampled by the first voltage detection circuit 110, and changes in the second detection value DET2 sampled by the second voltage detection circuit 120. As can be seen from the table, the first detection value DET1 is significantly increased (for example, 0.068 to 3.15V) when water enters the audio connector socket 300. Therefore, the state judgment circuit 130 may have a preset first critical value TH1 (for example but not limited to a value between 0.038 and 0.068 V). When the first detection value DET1 sampled by the first voltage detection circuit 110 is greater than the critical value TH1, it is determined that water has entered the audio connector socket 300. When it is less than the critical value TH1, the audio connector socket 300 is not flooded, and the conductor entering the audio connector socket 300 may be the audio connector 200. In one embodiment, only when the first detection value DET1 is less than the critical value TH1, the second voltage detection circuit 120 will be activated to determine the connector type of the audio connector 200.

[0038] Furthermore, if Figure 4As shown, when the audio connector 200 is a two-ring three-pole male connector of the sound amplification device 400, after being inserted into the audio connector female socket 300, the contact 313 and the contact 314 will be short-circuited (both connected to the third pole 213 of the audio connector 200), and the impedance RL between the two is extremely low (considering the existence of contact impedance), which is approximately between 0 and 1.1K ohms. On the other hand, when the audio connector 200 is a three-ring four-pole male connector of the sound amplification and sound pickup integrated device 500, the impedance RL between the contact 313 and the contact 314 (both connected to the third pole 213 and the fourth pole 214 of the audio connector 200, respectively) is approximately equal to the impedance Rm of the sound pickup device in the sound amplification and sound pickup integrated device 500, which is between 1.35 and 33K ohms. On the other hand, if the audio connector 200 is a male connector of a three-ring four-pole audio extension cable 600 and the female connector at the other end of the audio extension cable 600 has no conductor connected, the impedance RL between the contact 313 and the contact 314 (both connected to the third pole 213 and the fourth pole 214 of the audio connector 200, respectively) is infinite.

[0039] Furthermore, according to Figure 3 As can be seen from the table, the second detection value DET2 sampled by the second voltage detection circuit 120 at the contact 314 has three types of value distributions. When the audio connector 200 is a two-ring three-pole type, the value of the second detection value DET2 is the smallest (for example, 0 to 1.578V); when the audio connector 200 is a three-ring four-pole type, the value of the second detection value DET2 is the second largest (for example, 1.747V to 3.184V); when the audio connector 200 is a three-ring four-pole extension cord male connector, the value of the second detection value DET2 is the largest (for example, 3.3V). Therefore, the state judgment circuit 130 can preset two critical values ​​TH2 (for example but not limited to a value between 3.184 and 3.3V) and TH3 (for example but not limited to a value between 1.578 and 1.747V). When the second detection value DET2 sampled by the second voltage detection circuit is greater than the critical value TH2, it is determined that the current audio connector 200 is a male connector of a three-ring four-pole audio extension cable 600. When the second detection value DET2 is less than the critical value TH3, it is determined that the current audio connector 200 is a two-ring three-pole connecting cable male connector of the sound amplification device 400. When the second detection value DET2 is less than the critical value TH2 and greater than the critical value TH3, it is determined that the current audio connector 200 is a three-ring four-pole connecting cable male connector of the sound pickup and sound amplification integrated device 500.

[0040] In one embodiment, the state detection device 100 further includes an insertion detection circuit 140 and a voltage divider circuit 150. In one embodiment, the insertion detection circuit 140 of the state detection device 100 detects whether a conductor enters the audio connector female socket 300. Once the detection result of the insertion detection circuit 140 indicates that a conductor enters the audio connector female socket 300, the first voltage detection circuit 110 and the second voltage detection circuit 120 will be activated. Among them, after detecting that a conductor enters the audio connector female socket 300, the first voltage detection circuit 110 is activated, and according to the first detection value DET1 provided by the first voltage detection circuit 110, the state judgment circuit 130 determines whether the conductor entering the audio connector female socket 300 is an audio connector 200 or water. Furthermore, when it is determined that the conductor entering the audio connector female socket 300 is an audio connector 200, the second voltage detection circuit 200 will be activated, and the connector type will be judged according to the second detection value DET2 provided by the second voltage detection circuit 120. Please note that in some embodiments, the insertion detection circuit 140 may also be omitted, and the insertion detection may be performed directly through the first detection value DET1 output by the first voltage detection circuit 110 .

[0041] Furthermore, the voltage divider circuit 150 includes resistors Rc1, Ra1 and Ra2. The function of the resistor Rc1 is to adjust the voltage divided by the first voltage detection circuit 110 so that the first voltage detection circuit 110 can better detect the cross-voltage between the contact 311 and the contact 315 (the function of the resistor Ra3 coupled to the voltage VDD2 is the same). Furthermore, the functions of the resistors Ra1 and Ra2 are to prevent the audio signal output by the audio interface 10 from interfering with the insertion detection circuit 140 and causing it to malfunction.

[0042] After the status detection circuit 100 generates the detection result, the audio interface 10 can correctly control the connected audio peripheral device, such as: transmitting the correct corresponding signal to the audio peripheral device through the contact, starting or interrupting the audio playback, switching the audio playback device (such as switching the built-in speaker to an external audio peripheral device), or notifying the electronic device that water has entered the device.

[0043] Figure 5The detection flow chart of the state detection device 100 in the embodiment of the present invention is shown. First, in step S510, the insertion detection circuit 140 is used to determine whether a conductor enters the audio connector female socket 300; if so, step S520 is entered; if not, it stays at step S510 and continues to determine whether a conductor enters the audio connector female socket 300. In step S520, the first voltage detection circuit 110 is activated. At this time, according to the first detection value DET1 sampled by the first voltage detection circuit 110 (i.e., the cross-pressure value between the contact 311 and the contact 315 of the audio connector female socket 300) and the first critical value TH1, it is determined whether it is in the water inflow state; if so, the process stops at step S520, and the first voltage detection circuit 100 is continuously activated, waiting for the insertion of the audio connector 200. If the result of the judgment in step S520 is no, step S530 is entered, the first voltage detection circuit 110 is turned off and activated, and the second voltage detection circuit 120 is activated. According to the second detection value DET2 (i.e., the voltage value of the contact 311 of the audio connector female socket 300 to the ground) sampled by the second voltage detection circuit 120, as well as the second critical value TH2 and the third critical value TH3, the connector type is determined to be: a three-ring four-pole extension cord male connector, a two-ring three-pole connection cord male connector of the sound amplification device 400, or a three-ring four-pole connection cord male connector of the sound pickup and sound amplification integrated device 500. Once the connector type is determined to be a three-ring four-pole extension cord male connector, the second voltage detection circuit 120 will continue to start until it is detected that the connector type is a two-ring three-pole connection cord male connector of the sound amplification device 400, or a three-ring four-pole connection cord male connector of the sound pickup and sound amplification integrated device 500, and then the detection will be terminated. After that, the process enters step S540, and the insertion detection circuit 140 monitors the insertion status to detect whether the audio connector 200 is removed from the audio connector female socket. If it is removed, the process ends.

[0044] In summary, the present invention provides a circuit and related methods for detecting the connector type of an audio peripheral device and the water inflow state of a connector socket in an audio interface in an audio interface. In the present invention, by detecting the cross-pressure between the two contacts (contact 311 and contact 315) on the audio connector socket 300 connected to the first pole 211 of the audio connector 200, it is determined whether the audio connector socket 300 is flooded or an audio connector is inserted. A feature of the present invention is that the water inflow detection of the present invention can correctly detect whether salt water or fresh water enters the audio connector socket 300, and it can be achieved only by the first voltage detection circuit 110. In addition, the present invention also determines the type of audio connector and the audio peripheral device to which it belongs by detecting the voltage on the contact (contact 314) on the audio connector socket 300 connected to the fourth pole 214 of the audio connector 200. Since the present invention does not use additional contacts for state detection, it is suitable for existing connector sockets, and can provide detection of multiple connector types and water inflow states of the socket at the same time.

[0045] The embodiments of the present invention may be implemented using hardware, software, firmware, and combinations thereof. Through an appropriate instruction execution system, software or firmware stored in a memory may be used to implement the embodiments of the present invention. As for hardware, any of the following technologies or combinations thereof may be used to implement the embodiments: an individual operation logic having logic gates that can perform logic functions according to data signals, an application specific integrated circuit (ASIC) having suitable combinational logic gates, a programmable gate array (PGA), or a field programmable gate array (FPGA), etc.

[0046] The flow chart in the specification and the square block show the architecture, function and operation that can be realized by the system, method and computer software product based on various embodiments of the present invention. In this respect, each square block in the flow chart or the functional block diagram can represent the module, section or part of the program code, which includes one or more executable instructions for realizing the specified logical function. In addition, each square block in the functional block diagram and / or the flow chart, and the combination of square blocks, can be basically realized by the special hardware system that performs the specified function or action, or the combination of special hardware and computer program instructions. These computer program instructions can also be stored in a computer-readable medium, which can make a computer or other programmable data processing device work in a special way, so that the instructions stored in the computer-readable medium realize the function / action specified by the square block in the flow chart and / or the functional block diagram.

[0047] The above descriptions are only preferred embodiments of the present invention. All equivalent changes and modifications made according to the claims of the present invention should fall within the scope of the present invention.

Claims

1. A state detection device for an audio interface, comprising: A first voltage detection circuit is coupled to a first contact and a second contact of an audio connector socket, and is used to detect a cross voltage between the first contact and the second contact, thereby generating a first detection value; A second voltage detection circuit is coupled to a third contact of the audio connector socket, and is used to detect the voltage on the third contact, thereby generating a second detection value; a state judgment circuit, coupled to the first voltage detection circuit and the second voltage detection circuit, for judging a water ingress state of the audio connector socket according to the first detection value, and judging a connector type of an audio connector inserted into the audio connector socket according to the second detection value, in, When the audio connector is inserted into the audio connector female socket, the first contact point, the second contact point and the third contact point are in contact with an audio connector.

2. The state detection device according to claim 1, further comprising: An insertion detection circuit is coupled to the second contact to detect the voltage on the second contact to determine an insertion state; and when a conductor enters the audio connector socket in the insertion state, the first voltage detection circuit and the second voltage detection circuit will be activated.

3. The state detection device according to claim 2, further comprising: A voltage divider circuit is coupled between the second contact, the first voltage detection circuit and the insertion detection circuit, and is used to provide voltage division to the first voltage detection circuit and the insertion detection circuit. 4 . The state detection device as claimed in claim 1 , wherein the first voltage detection circuit and the second voltage detection circuit are analog-to-digital converters.

5. The status detection device as described in claim 1, wherein the status judgment circuit judges the water ingress status according to the first detection value and a first critical value; when the first detection value is greater than the first critical value, the status judgment circuit judges that water has entered the audio connector socket, and when the first detection value is less than the first critical value, the status judgment circuit judges that water has not entered the audio connector and judges that the audio connector is inserted into the audio connector socket; when the status judgment circuit judges that water has not entered the audio connector, the second voltage detection circuit will be activated.

6. The state detection device as claimed in claim 1, wherein the state judgment circuit determines the connector type according to the second detection value, a second critical value and a third critical value, when the second detection value is greater than the second critical value, the state judgment circuit determines that the audio connector belongs to a three-ring four-pole male connector of an audio extension line, when the second detection value is less than the second critical value and greater than the third critical value, the state judgment circuit determines that the audio connector belongs to a three-ring four-pole connecting line male connector of a sound amplification and sound pickup integrated device; and when the second detection value is less than the third critical value, the state judgment circuit determines that the audio connector belongs to a two-ring three-pole connecting line male connector of a sound amplification device.

7. A status detection device as described in claim 1, wherein the audio connector socket also has a fourth contact and a fifth contact, wherein the first contact and the second contact are used to connect a first pole of the audio connector when the audio connector is inserted into the audio connector socket; the fourth contact is used to connect a second pole of the audio connector; the fifth contact is used to connect a third pole of the audio connector; and the third contact is used to connect the third pole or a fourth pole of the audio connector.

8. The status detection device as claimed in claim 7, wherein the first pole of the audio connector is used to conduct the left channel audio signal of the audio interface, the second pole is used to conduct the right channel audio signal of the audio interface, and the third pole or the fourth pole is used to conduct the microphone signal of the audio interface.

9. A state detection method for an audio interface, comprising: Detecting a cross-pressure between a first contact point and a second contact point of an audio connector female socket, thereby generating a first detection value; Detecting a voltage on a third contact of the audio connector socket, thereby generating a second detection value; Determining a water ingress state of the audio connector socket according to the first detection value; and Determine a connector type of an audio connector inserted into the audio connector socket according to the second detection value, in, When the audio connector is inserted into the audio connector female socket, the first contact point, the second contact point and the third contact point are in contact with an audio connector.

10. The state detection method according to claim 9, further comprising: Detecting the voltage of the second contact of the audio connector female socket to determine an insertion state; and When the insertion state indicates that a conductor has entered the audio connector female socket, the operation of generating the first detection value and the second detection value is performed.

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