Earphone for optimizing earphone plosive sound and terminal equipment thereof

Abstract

The utility model provides an earphone for optimizing the plosive sound of the earphone, which comprises an earphone connector, the top end of the earphone connector is provided with an identification section, and the identification section is connected with a grounding section of the earphone connector through a divider resistor when the earphone is a first earphone and is suspended when the earphone is a second earphone; the identification section is used for being connected with a first universal interface of terminal equipment; when the earphone is connected to the terminal equipment, the earphone type detection voltage is obtained through voltage excitation provided by the first universal interface to the identification section, so that the terminal equipment determines the earphone type according to the earphone type detection voltage. According to the utility model, an identification section is specially added for the earphone and is used for distinguishing the types of inserted European-standard earphones or American-standard earphones, so that the problem of plosive sound caused by the fact that a bias power supply pin is electrified and discharged to a left sound channel and a right sound channel under the condition that a coder-decoder chip detects illegal earphones / European-American-standard earphones is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to earphone and its terminal equipment especially relates to earphone and its terminal equipment of optimization earphone burst sound. BACKGROUND

[0002] 3.5mm earphone will have earphone POP sound (that is, burst sound) in the use process, one is the burst sound of earphone plug, and the burst sound caused by the mismatch of earphone seat structure tolerance and earphone head, another is the burst sound produced by some detection behaviors of system, for example, the terminal equipment only supporting the European standard earphone inserts the American standard earphone, and will produce the burst sound, or, in the terminal equipment supporting the earphone of European and American standard, the default of analog switch is European standard direction, but inserts the American standard earphone, at this moment, mismatch will also cause the phenomenon of burst sound.

[0003] As Figure 1A and Figure 1B are two kinds of earphone types American standard earphone and European standard earphone earphone connector, as Figure 1A shown, the earphone connector of American standard earphone includes left channel section LA, right channel section RA, ground section GND and microphone section MIC connected in sequence from the top end of earphone connector, as Figure 1B shown, the earphone connector of European standard earphone includes left channel section LA, right channel section RA, microphone section MIC and ground section GND connected in sequence from the top end of earphone connector to the tail of earphone connector.

[0004] For this, most terminal equipment only supports one kind of earphone type, and some terminal equipment needs to support two kinds of earphone types, so the terminal equipment needs to detect the earphone type inserted, in the prior art, the detection principle of terminal equipment detecting illegal earphone and earphone of European and American standard is same.

[0005] Among them, in the first case, if a terminal equipment only supports one kind of earphone type, such as only supports European standard earphone, the block diagram of earphone detection circuit of terminal equipment is as Figure 2 shown, wherein the earphone detection circuit of terminal equipment includes Codec (audio codec) chip 201, and the Codec chip 201 includes channel reference pin HPH-REF, right channel pin HPH-R, left channel pin HPH-L, detection pin DET, bias power supply pin micbias and microphone pin MICP, wherein the right channel pin HPH-R and left channel pin HPH-L are connected with right channel section RA and left channel section LA respectively, and the detection pin DET is connected with left channel section LA, the channel reference pin HPH-REF and the ground section GND of earphone connector are both grounded, and the microphone pin MICP is connected with microphone section MIC.

[0006] Thus, after the terminal device supporting only the European standard earphone is inserted with the American standard earphone, the bias power supply pin micbias is powered on, and the voltage is discharged through the left and right sound channels and the microphone section MIC. The microphone pin MICP of the Codec detects the voltage to determine whether it is an illegal earphone. The detection process of this system causes the American standard earphone to have a popping sound at the moment of powering on the bias power supply pin micbias after being inserted.

[0007] In the detection process, the specific equivalent circuit is shown in Figure 3 The earphone connector of the American standard earphone is inserted into the earphone seat of the terminal device, the bias power supply pin micbias of the terminal device is connected to the microphone pin MICP of the terminal device through the first resistor R1, the microphone pin MICP is connected to the ground section GND of the American standard earphone, and the ground section GND is connected to the ground side of the left sound channel device L, the right sound channel device R, and the microphone device M of the American standard earphone. The sound channel reference pin HPH-REF of the terminal device is connected to the microphone section MIC (i.e., the power supply side of the microphone device M) of the American standard earphone. The resistors R6, R7, and R8 of the left sound channel device L, the right sound channel device R, and the microphone device M are 32Ω, 32Ω, and 2kΩ, respectively. The right sound channel pin HPH-R and the left sound channel pin HPH-L of the terminal device are connected to the right sound channel section RA (i.e., the power supply side of the right sound channel device R) and the left sound channel section LA (i.e., the power supply side of the left sound channel device L), respectively, so that the power supply side of the right sound channel device R is grounded through the second resistor R2 and / or the fourth resistor R4, and the power supply side of the left sound channel device L is grounded through the third resistor R3 and / or the fifth resistor R5. The second resistor R2 and the third resistor R3 are pull-down resistors, and the fourth resistor R4 and the fifth resistor R5 are pull-down resistors. R1 = 2.2kΩ, R4 = R5 = 1kΩ. The second resistor R2 and the third resistor R3 are located inside the Codec chip 201, and the fourth resistor R4 and the fifth resistor R5 are located outside the Codec chip 201. Therefore, the current of the bias power supply pin micbias passes through the first resistor R1, the right sound channel section RA, and the fourth resistor R4 to the ground, and the current passes through the first resistor R1, the left sound channel section LA, and the fifth resistor R5 to the ground, which causes a popping sound at the moment of powering on.

[0008] In the terminal device supporting the switching of the European standard earphone and the American standard earphone, the circuit block diagram of the terminal device is shown in Figure 4As shown in the figure. Among them, the earphone detection circuit of the terminal device includes a Codec (codec) chip 201, and a switching switch or analog switch 202 of the microphone section MIC and the ground section GND. The Codec chip includes a sound channel reference pin HPH-REF, a right sound channel pin HPH-R, a left sound channel pin HPH-L, a detection pin DET, a bias power supply pin micbias, and a microphone pin MICP; the switching switch or analog switch 202 includes a sleeve pin sleeve connected to the section farthest from the tip of the earphone, a ring pin ring2 connected to the second farthest section of the tip of the earphone, a far end marker terminal Agnd, and a microphone pin MICP. Among them, the right sound channel pin HPH-R and the left sound channel pin HPH-L are connected to the right sound channel section RA and the left sound channel section LA respectively, and the detection pin DET is connected to the left sound channel section LA. The sound channel reference pin HPH-REF is grounded and connected to the far end marker terminal Agnd, and the microphone pin MICP of the Codec chip is connected to the microphone pin MICP of the switching switch or analog switch 202. Therefore, according to the detection result, the sleeve pin sleeve of the switching switch or analog switch 202 is connected to the microphone pin MICP, the ring pin ring2 is connected to the far end marker terminal Agnd, or the switching switch or analog switch 202 is switched to connect the sleeve pin sleeve to the far end marker terminal Agnd, and the ring pin ring2 is connected to the microphone pin MICP. The CPU 203 is connected to the switching switch or analog switch 202 through the zeroth general interface GPIO0, and is connected to the Codec chip through the chip communication interface 204.

[0009] Therefore, after inserting the earphone, the bias power supply pin micbias is powered on. Since the switching state does not match the type of the inserted earphone (for example, the default switching state of the switch is the European standard state, and the inserted earphone is an American standard earphone), the switch needs to be switched to match the type of the inserted earphone. Therefore, during the mismatch period, a burst sound is generated as Figure 2 As shown in the equivalent circuit, the bias power supply pin micbias voltage is discharged through the right sound channel section RA and the left sound channel section LA, and a burst sound is generated at the power-on and power-off moments. Finally, the oscilloscope waveform diagram as shown in Figure 5 As shown in the figure.

[0010] Therefore, in order to solve the problem of burst sound generated by the system detection behavior, for example, the burst sound generated by the mismatch of the switch direction of the terminal device supporting one type of earphone when inserting a non-standard earphone and the terminal device supporting European and American standard earphones, it is necessary to design the terminal device specifically to avoid generating a burst sound.

[0011] The prior art avoids the generation of popping sound by increasing the resistance value of the left and right channel pull-down resistors to reduce the discharge path current. Practical new type content

[0012] The utility model discloses a kind of earphone and terminal equipment for optimizing earphone popping sound, to avoid the generation of popping sound.

[0013] To achieve the above object, the utility model provides a kind of earphone for optimizing earphone popping sound, including earphone connector, the earphone is equipped with identification section at the top of its earphone connector, the identification section is connected with the ground section of earphone connector by voltage division resistor when earphone is first earphone, and it is suspended when earphone is second earphone;The identification section is used to be connected with the first general interface of terminal equipment;The earphone is connected when being accessed to terminal equipment, and the earphone type detection voltage is obtained by the voltage excitation provided to identification section by first general interface, so that terminal equipment determines earphone type according to earphone type detection voltage.

[0014] The earphone connector of the first earphone includes identification section, left channel section, right channel section, ground section and microphone section connected in sequence from the top of the earphone connector;The first earphone includes the ground section, left channel device, right channel device and microphone device connected with the ground section;The ground side of left channel device, right channel device and microphone device is connected with ground section, and the power supply side is connected with the left channel section, right channel section and microphone section of the earphone connector respectively.

[0015] The earphone connector of the second earphone includes identification section, left channel section, right channel section, microphone section and ground section connected in sequence from the top of the earphone connector;The second earphone includes the ground section, left channel device, right channel device and microphone device connected with the ground section;The ground side of left channel device, right channel device and microphone device is connected with ground section, and the power supply side is connected with the left channel section, right channel section and microphone section of the earphone connector respectively.

[0016] In another aspect, the utility model provides a kind of terminal equipment of earphone for optimizing earphone burst sound, it is used for identifying the earphone of the top of earphone connector is equipped with identification section, the identification section is connected with the ground section of earphone connector by voltage division resistance when earphone is American standard earphone, it is suspended when earphone is European standard earphone;The earphone detection circuit of the terminal equipment includes CPU, the CPU has first general interface, first general interface is used to connect the identification section of earphone;And first general interface is connected with a high level internal identification power supply by pull-up resistance, to provide voltage excitation to the identification section of earphone to form earphone type detection voltage;The terminal equipment is set to read the earphone type detection voltage, if earphone type detection voltage is low level then the earphone is first earphone, otherwise the earphone is second earphone.

[0017] The first general interface can be connected with the high level internal identification power supply, so that the first general interface provides voltage excitation to the identification section of earphone to form earphone type detection voltage when connecting the internal identification power supply;The earphone detection circuit of the terminal equipment further includes a codec chip, the CPU is connected with the codec chip through chip communication interface, and the codec chip includes a detection pin, which forms an insertion interrupt signal when the earphone is inserted;The CPU is configured to connect the first general interface with the high level internal identification power supply after detecting the insertion interrupt signal.

[0018] The terminal device further includes an earphone seat, the earphone seat includes a left channel pin and an interface detection pin for contact fitting with a left channel section of the earphone connector, the detection pin is connected with the interface detection pin of the earphone seat and connected with an internal detection power supply, the left channel section is connected with one end of a left channel device of the earphone, and the other end of the left channel device is connected with a ground section of the earphone connector; after the earphone is inserted, the left channel pin and the interface detection pin are short-circuited, causing the voltage of the detection pin to be pulled down to form an insertion interrupt signal.

[0019] The codec chip includes a right channel pin and a left channel pin, and the right channel pin and the left channel pin are used to connect a right channel section and a left channel section of the earphone connector, respectively; the right channel pin is grounded through a first pull-down resistor, and the left channel pin is grounded through a second pull-down resistor.

[0020] The codec chip includes a bias power supply pin; the earphone seat further includes a ground pin and a microphone pin; the CPU is configured to power on the bias power supply pin when the earphone type is supported by the terminal device, or not power on the bias power supply pin; alternatively, the CPU is configured to directly power on the bias power supply pin when the earphone type is a default type of the terminal device, or drive a switch or an analog switch to switch the earphone pin and the microphone pin of the earphone seat, and then power on the bias power supply pin.

[0021] The codec chip also includes a microphone pin, and the bias power supply pin is connected to the microphone pin of the codec chip via a first resistor.

[0022] The resistance of the voltage dividing resistor is above 10kΩ, and the ratio of the resistance of the voltage dividing resistor to the resistance of the pull-up resistor is less than 1:8.

[0023] The utility model discloses a earphone specially adds an identification section, and distinguishes the type of inserted European standard or American standard earphone with it. Compared with the traditional mode of detecting earphone type by using bias voltage power supply pin, the utility model solves the problem of burst sound caused by the discharge of bias power supply pin to left and right sound channels in the case of detecting illegal earphone / European and American standard earphone by codec chip. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1A It is the structure diagram of earphone interface of the existing American standard earphone.

[0025] Figure 1B It is the structure diagram of earphone interface of the existing European standard earphone.

[0026] Figure 2 It is the block diagram of earphone detection circuit of the existing terminal equipment only supporting European standard earphone.

[0027] Figure 3 It is the equivalent circuit diagram of earphone detection circuit of the existing terminal equipment only supporting European standard earphone after inserting American standard earphone.

[0028] Figure 4 It is the block diagram of earphone detection circuit of the existing terminal equipment supporting European standard earphone and American standard earphone switching.

[0029] Figure 5 It is the oscilloscope waveform diagram actually measured by the existing earphone detection circuit when the type of inserted earphone does not match.

[0030] Figure 6 It is the structure diagram of earphone connector of the earphone of the utility model.

[0031] Figure 7 It is the equivalent circuit diagram of the earphone of the utility model. Figure 6

[0032] It is the structure diagram of earphone connector of the earphone of the utility model. Figure 8

[0033] It is the equivalent circuit diagram of the earphone of the utility model. Figure 9 Figure 8 ​An equivalent circuit diagram of an earphone for optimizing earphone popping sound.

[0034] Figure 10 A structure diagram of an earphone seat of a terminal device of an earphone for optimizing earphone popping sound according to the third embodiment of the present application.

[0035] Figure 11 A structure diagram of an earphone detection circuit of a terminal device of an earphone for optimizing earphone popping sound according to the third embodiment of the present application.

[0036] Figure 12 A structure diagram of an earphone detection circuit of a terminal device of an earphone for optimizing earphone popping sound according to the fourth embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] As shown in Figures 6-8 , compared with the earphone connector of a traditional earphone, the earphone for optimizing earphone popping sound of the present application is additionally provided with an identification section ID at the top end of the earphone connector. The identification section ID is connected with the grounding section GND of the earphone through a voltage dividing resistor R0 when the earphone is an American standard earphone, and is suspended when the earphone is a European standard earphone. The identification section ID is used to be connected with the first general interface GPIO1 of the terminal device. The earphone obtains an earphone type detection voltage by providing a voltage excitation to the identification section ID through the first general interface GPIO1 when the earphone is connected to the terminal device, so that the terminal device determines the earphone type according to the earphone type detection voltage.

[0039] In addition, the identification sections of the American standard earphone and the European standard earphone can also be interchanged, that is, the identification section ID is connected with the grounding section GND of the earphone through a voltage dividing resistor R0 when the earphone is a European standard earphone, and is suspended when the earphone is an American standard earphone. Any two different types of earphones can be distinguished by the above two setting modes of the identification section ID.

[0040] According to the first embodiment of the present application, as shown in Figure 6 , the earphone for optimizing earphone popping sound of the present application is an American standard earphone, and the earphone connector thereof comprises an identification section ID, a left channel section LA, a right channel section RA, a grounding section GND and a microphone section MIC connected in sequence from the top end of the earphone connector.

[0041] The equivalent circuit diagram of the earphone for optimizing earphone popping sound is shown in Figure 7 The identification section ID of the earphone for optimizing earphone popping sound is connected to the ground section GND of the earphone via the voltage dividing resistor R0, and thus the earphone for optimizing earphone popping sound comprises the ground section GND for grounding, the left channel device L, the right channel device R and the microphone device M connected with the ground section GND. The left channel device L, the right channel device R and the microphone device M are connected with the ground section GND through the grounding sides thereof, and the power supply sides of the left channel device L, the right channel device R and the microphone device M are connected with the left channel section LA, the right channel section RA and the microphone section MIC of the earphone connector respectively.

[0042] According to the second embodiment of the present application, as shown in Figure 8 The earphone for optimizing earphone popping sound of the present application is a European standard earphone, and the earphone connector thereof comprises the identification section ID, the left channel section LA, the right channel section RA, the microphone section MIC and the ground section GND connected in sequence from the top end of the earphone connector.

[0043] The equivalent circuit diagram of the earphone for optimizing earphone popping sound is shown in Figure 9 The identification section ID of the earphone for optimizing earphone popping sound is suspended and not connected with any device. Thus the earphone for optimizing earphone popping sound comprises the ground section GND for grounding, the left channel device L, the right channel device R and the microphone device M connected with the ground section GND. The left channel device L, the right channel device R and the microphone device M are connected with the ground section GND through the grounding sides thereof, and the power supply sides of the left channel device L, the right channel device R and the microphone device M are connected with the left channel section LA, the right channel section RA and the microphone section MIC of the earphone connector respectively.

[0044] Third embodiment: terminal device of the earphone for optimizing earphone popping sound supporting only one kind of earphone

[0045] In the present embodiment, the terminal device of the earphone for optimizing earphone popping sound of the present application can be used to identify the American standard earphone and the European standard earphone and optimize earphone popping sound. When it is identified that the earphone does not support, the function of the microphone is not started, and only the function of the three-section earphone is provided.

[0046] As shown in Figure 10As shown, the terminal device has an earphone seat 205 for inserting an earphone jack, which is additionally provided with an identification pin ID' for contact matching with the identification segment ID on the basis of a traditional earphone seat. Therefore, the earphone seat 205 comprises an identification pin ID' for contact matching with the identification segment ID, a left channel pin LA' for contact matching with the left channel segment LA and an interface detection pin DET', a right channel pin RA' for contact matching with the right channel segment RA, a microphone pin MIC' for contact matching with the microphone segment MIC (but actually possible to contact the ground segment GND when the earphone type is not consistent), and a ground pin GND' for contact matching with the ground segment GND (but actually possible to contact the microphone segment MIC when the earphone type is not consistent).

[0047] In the embodiment, the earphone seat 205 matches with the European standard earphone, therefore, the identification pin ID', the left channel pin LA', the right channel pin RA', the microphone pin MIC' and the ground pin GND' are arranged in sequence.

[0048] According to the third embodiment of the utility model, the equivalent circuit diagram of the earphone detection circuit of the terminal device of the earphone for optimizing the earphone popping sound is as shown in the figure. Figure 11

[0049] Among them, the earphone detection circuit of the terminal device comprises a Codec (coder-decoder) chip 201 and a CPU 203. The Codec chip 201 comprises a channel reference pin HPH-REF, a right channel pin HPH-R, a left channel pin HPH-L, a detection pin DET, a bias power supply pin micbias and a microphone pin MICP.

[0050] ​The right channel pin HPH-R and the left channel pin HPH-L are connected to the left channel pin LA' and the right channel pin RA' of the earphone seat respectively, for connecting the right channel segment RA and the left channel segment LA of the earphone connector; the detection pin DET is connected to the interface detection pin DET' of the earphone seat, for connecting the left channel segment LA. The right channel pin HPH-R is grounded through the second resistance R2 and / or the fourth resistance R4, and the left channel pin HPH-L is grounded through the third resistance R3 and / or the fifth resistance R5. The second resistance R2 and the third resistance R3 are pull-down resistances, and the fourth resistance R4 and the fifth resistance R5 are pull-down resistances. R4=R5=1kΩ. The difference is that the second resistance R2 and the third resistance R3 are located inside the Codec chip 201, and the fourth resistance R4 and the fifth resistance R5 are located outside the Codec chip 201. The detection pin DET is configured to form an insertion interrupt signal when the earphone is inserted, and the CPU 203 is configured to connect the first general interface GPIO1 to the high-level internal identification power supply through the pull-up resistance after detecting the insertion interrupt signal. Specifically, the detection pin DET is connected to the interface detection pin DET' of the earphone seat and connected to an internal detection power supply.

[0051] The channel reference pin HPH-REF is grounded and connected to the ground pin GND' of the earphone seat, for connecting the ground segment GND or the microphone segment MIC of the earphone connector.

[0052] The bias power supply pin micbias of the terminal device is connected to the microphone pin MICP of the Codec chip 201 through the first resistance R1, and R1=2.2kΩ. The microphone pin MICP of the Codec chip 201 is connected to the microphone pin MIC' of the earphone seat, for connecting the microphone segment MIC or the ground segment GND.

[0053] The CPU 203 has a chip communication interface 204 and a first general-purpose interface GPIO1, and the CPU 203 is connected with the Codec chip 201 through the chip communication interface. The first general-purpose interface GPIO1 is connected with the identification pin ID' of the earphone seat for connecting the identification segment ID of the earphone, and the first general-purpose interface GPIO1 is cutably connected with an internal identification power supply of a high level through a pull-up resistor (not shown in the figure), and the first general-purpose interface GPIO1 is used for providing voltage excitation to the identification segment ID of the earphone through the identification pin ID' of the earphone seat when the internal identification power supply is connected to form an earphone type detection voltage. The level of the earphone type detection voltage is used to identify whether the earphone type is a European standard earphone or an American standard earphone. Specifically, the terminal device is set to read the earphone type detection voltage on the identification segment ID of the earphone. If the first general-purpose interface GPIO1 reads that the earphone type detection voltage is a low level, the earphone is an American standard earphone. If the first general-purpose interface GPIO1 reads that the earphone type detection voltage is a high level, the earphone is a European standard earphone. The CPU of the terminal device is set to power on the bias power supply pin micbias when the earphone type is supported by the terminal device, otherwise the bias power supply pin micbias is not powered on.

[0054] In the formula, the voltage division resistor R0 is used to prevent the burst sound caused by the power-on of the first general-purpose interface GPIO1 of the CPU 203. The lower the earphone type detection voltage read by the first general-purpose interface GPIO1, the greater the resistance value of the voltage division resistor R0, and the smaller the possible burst sound. The resistance value of R1 needs to be adjusted and matched with the pull-up resistor of the first general-purpose interface GPIO1. The pull-up resistor is recommended to be an external pull-up resistor (i.e. the pull-up resistor is outside the CPU), and the resistance value of the voltage division resistor R0 can be freely adjusted. In the embodiment, the resistance value of the voltage division resistor R0 is greater than 10kΩ, and the ratio of the resistance value of the voltage division resistor R0 to the pull-up resistor is less than 1:8, and is preferably 1:10.

[0055] In the formula, the first general-purpose interface GPIO1 is pulled low by default when the detection pin DET of the Codec chip 201 does not detect an interrupt signal. Thus, during the earphone insertion process, the current is prevented from being discharged from the identification segment ID due to the earphone scratching caused by the pull-up of the first general-purpose interface GPIO1, and a discharge POP sound is introduced.

[0056] The working principle of the terminal device of the earphone of the utility model only supporting one kind of earphone and optimizing the burst sound of the earphone is described below.

[0057] After the earphone is inserted, the insertion of the earphone causes the left channel pin LA' and the interface detection pin DET' of the earphone seat to be short-circuited, so that the left channel device L of the earphone is connected to the detection pin DET of the Codec chip 201 via the left channel segment LA, the left channel pin LA' and the interface detection pin DET', which causes the voltage of the detection pin DET of the Codec chip 201 to be pulled low by a pull-down resistor (i.e. the third resistor R3 and / or the fifth resistor R5) to form an insertion interrupt signal.

[0058] After the earphone is inserted, the voltage of the detection pin DET changes to form an insertion interrupt signal. Therefore, the CPU 203 is set to, after detecting the insertion interrupt signal, cause the first general-purpose interface GPIO1 to be connected to the high-level internal identification power supply through a pull-up resistor (or cause the internal identification power supply to change from low to high) to provide a voltage excitation to the identification segment ID of the earphone through the identification pin ID' of the earphone seat to form an earphone type detection voltage, so as to enter the US / EU standard earphone identification phase. The first general-purpose interface GPIO1 is set to read the earphone type detection voltage on the identification segment ID of the earphone, and if a low level is read, it is a US standard earphone, and if a high level is read, it is a EU standard earphone.

[0059] In the prior art, after a conventional terminal device inserts an earphone, the detection pin DET changes from a high level to a low level insertion interrupt signal. The Codec chip 201 enables the bias power supply pin micbias to output a bias voltage after detecting the insertion interrupt signal, and detects the earphone type of the inserted device through the bias power supply pin micbias of the Codec chip 201. In this process, the power-on of the bias power supply pin micbias will generate a discharge path to the left and right channels to produce a POP sound under a mismatched earphone type.

[0060] In the case of the present scheme, for a terminal device that only supports US standard earphones, after a EU standard earphone is inserted, the entire process is as follows: the first general-purpose interface GPIO1 is pulled low by default, after a EU standard earphone is inserted, the Codec chip 201 detects the insertion interrupt signal, the first general-purpose interface GPIO1 is pulled high to enter the earphone type detection phase, and it is judged that the earphone type detection voltage read at the first general-purpose interface GPIO1 is a high level, which is a EU standard earphone, which is not supported by the terminal device, the bias power supply pin micbias is not powered on, and there is no POP sound in the left and right channels of the earphone. The EU standard earphone can only be used as a three-segment earphone.

[0061] For the terminal device supporting only the European standard earphone, the same principle applies after inserting the American standard earphone, but the earphone type detection voltage read by the first general interface GPIO1 in the American standard earphone insertion detection stage is low (the voltage is divided by the voltage dividing resistor R0 and the pull-up resistor or external pull-up resistor at the first general interface GPIO1, and the voltage dividing on the voltage dividing resistor R0 makes the earphone type detection voltage of the first general interface GPIO1 low), which indicates that the earphone type is the American standard earphone.

[0062] The fourth embodiment: a terminal device supporting two kinds of earphones and optimizing earphone popping sound

[0063] As shown in Figure 12 The earphone detection circuit of the terminal device supporting two kinds of earphones and optimizing earphone popping sound according to the fourth embodiment of the present application is shown.

[0064] As shown in Figure 12 According to the fourth embodiment of the present application, the specific structure of the terminal device optimizing earphone popping sound is basically the same as that of the third embodiment of the present application, and the difference is only that the earphone detection circuit of the terminal device optimizing earphone popping sound further includes a switching switch or an analog switch 202.

[0065] The switching switch or the analog switch 202 includes a sleeve pin sleeve connected to one of the microphone pin MIC' and the ground pin GND' of the earphone seat, a ring pin ring2 connected to the other of the microphone pin MIC' and the ground pin GND' of the earphone seat, a distal end marker terminal Agnd, and a microphone pin MICP. In this embodiment, the sleeve pin sleeve is connected to the pin farthest from the identification pin ID' of the earphone seat, and the ring pin ring2 is connected to the pin second farthest from the identification pin ID' of the earphone seat.

[0066] The channel reference pin HPH-REF is grounded and connected to the distal end marker terminal Agnd, and the microphone pin MICP of the Codec chip is connected to the microphone pin MICP of the switching switch or the analog switch 202. In this way, the switching switch or the analog switch 202 can be switched between the sleeve pin sleeve connected to the microphone pin MICP and the ring pin ring2 connected to the distal end marker terminal Agnd, and the sleeve pin sleeve connected to the distal end marker terminal Agnd and the ring pin ring2 connected to the microphone pin MICP. The CPU 203 is connected to the switching switch or the analog switch 202 through the zeroth general interface GPIO0.

[0067] The CPU of the terminal device is configured to directly power on the bias power supply pin micbias when the earphone type is the default type of the terminal device, otherwise, drive the switch or the analog switch 202 to switch the ground pin GND' of the earphone seat and the microphone pin MIC', and then power on the bias power supply pin micbias.

[0068] Thus, for the terminal device supporting two types of earphones, i.e., the terminal device with the switch of the earphone section and the microphone section, the entire working process is as follows: if the switching direction of the MIC / GND switch is the default American standard earphone direction, the first general interface GPIO1 is pulled low by default, after the European standard earphone is inserted, the Codec detects the insertion interruption, the first general interface GPIO1 is internally pulled up to enter the European standard / illegal earphone detection stage, the first general interface GPIO1 reads high level, which is the European standard earphone, and the current switching direction is not supported, the CPU issues a command to switch the switching direction of the switch, and then the micbias is powered on, at this time, there is no abnormal discharge path for the left and right channels of the earphone, and no POP sound is generated. If the default switching direction of the MIC / GND switch is the European standard earphone direction, the same applies, except that the first general interface GPIO1 reads low level in the European standard / illegal earphone detection stage.

[0069] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0070] The above only describes the embodiments of the specification and does not limit the specification. The specification can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the specification shall be included in the scope of the claims of the specification.

Claims

1. A headphone that optimizes a popping sound of the headphone, characterized by, The earphone connector comprises an identification segment at the top end of the earphone connector, the identification segment is connected with the grounding segment of the earphone connector through a voltage dividing resistor when the earphone is a first earphone, and the identification segment is suspended when the earphone is a second earphone; The identification segment is used for connecting with a first universal interface of a terminal device; when the earphone is connected with the terminal device, the earphone obtains an earphone type detection voltage by providing a voltage excitation to the identification segment through the first universal interface, so that the terminal device determines the earphone type according to the earphone type detection voltage.

2. The earphone that optimizes earphone pop according to claim 1, characterized in that, The earphone connector of the first earphone comprises, from the top end of the earphone connector, an identification segment, a left channel segment, a right channel segment, a grounding segment and a microphone segment; The first earphone comprises the grounding segment, a left channel device connected with the grounding segment, a right channel device and a microphone device; the grounding sides of the left channel device, the right channel device and the microphone device are connected with the grounding segment, and the power supply sides are connected with the left channel segment, the right channel segment and the microphone segment of the earphone connector respectively.

3. The earphone that optimizes earphone pop according to claim 1, characterized in that, The earphone connector of the second earphone comprises, from the top end of the earphone connector, an identification segment, a left channel segment, a right channel segment, a microphone segment and a grounding segment; The second earphone comprises the grounding segment, a left channel device connected with the grounding segment, a right channel device and a microphone device; the grounding sides of the left channel device, the right channel device and the microphone device are connected with the grounding segment, and the power supply sides are connected with the left channel segment, the right channel segment and the microphone segment of the earphone connector respectively.

4. A terminal device of a headphone that optimizes a popping sound of the headphone, characterized by, The earphone connector of the second earphone comprises, from the top end of the earphone connector, an identification segment, a left channel segment, a right channel segment, a microphone segment and a grounding segment; The earphone detection circuit of the terminal device comprises a CPU, the CPU has a first universal interface, the first universal interface is used for connecting the identification segment of the earphone; the first universal interface is connected with an internal identification power supply at a high level through a pull-up resistor, so as to provide a voltage excitation to the identification segment of the earphone to form an earphone type detection voltage; The terminal device is arranged to read the earphone type detection voltage, if the earphone type detection voltage is at a low level, the earphone is the first earphone, otherwise, the earphone is the second earphone.

5. The end device of headphones that optimizes a pop sound of the headphones according to claim 4, characterized by, The first universal interface is connected with the internal identification power supply at the high level in a cuttable manner, so that the first universal interface provides the voltage excitation to the identification segment of the earphone to form the earphone type detection voltage when the first universal interface is connected with the internal identification power supply; The earphone detection circuit of the terminal device further comprises a codec chip, the CPU is connected with the codec chip through a chip communication interface, the codec chip comprises a detection pin, the detection pin forms an insertion interrupt signal when the earphone is inserted; the CPU is arranged to connect the first universal interface with the internal identification power supply at the high level after detecting the insertion interrupt signal.

6. The end device of headphones that optimizes a pop sound of the headphones according to claim 5, characterized by, The terminal device further comprises an earphone seat, the earphone seat comprises a left channel pin used for contacting and matching with the left channel segment of the earphone connector and an interface detection pin, the detection pin is connected with the interface detection pin of the earphone seat and an internal detection power supply, the left channel segment is connected with one end of the left channel device of the earphone, and the other end of the left channel device is connected with the grounding segment of the earphone connector; After the earphone is inserted, the left channel pin and the interface detection pin are short-circuited, so that the voltage of the detection pin is pulled down to form an insertion interruption signal.

7. The end device of headphones that optimizes a pop sound of headphones according to claim 5, characterized by, The codec chip comprises a right channel pin and a left channel pin, which are used for connecting the right channel segment and the left channel segment of the earphone connector respectively; the right channel pin is connected to the ground through a first pull-down resistor, and the left channel pin is connected to the ground through a second pull-down resistor.

8. The end device of headphones that optimizes a pop sound of headphones according to claim 6, characterized by, The codec chip comprises a bias power supply pin; the earphone seat further comprises a ground pin and a microphone pin. The CPU is configured to power on the bias power supply pin when the earphone type is supported by the terminal device, or to directly power on the bias power supply pin when the earphone type is the default type of the terminal device, otherwise, to drive the switch to switch the earphone pin and the microphone pin of the earphone seat, and then power on the bias power supply pin.

9. A terminal device of headphones that optimizes a pop sound of the headphones according to claim 8, characterized by, The codec chip further comprises a microphone pin, and the bias power supply pin is connected to the microphone pin of the codec chip via a first resistor.

10. The end device of headphones that optimizes a pop sound of headphones according to claim 4, characterized by, The resistance value of the voltage dividing resistor is greater than 10kΩ, and the ratio of the resistance value of the voltage dividing resistor to the resistance value of the pull-up resistor is less than 1:8.

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