A device for cancelling the current sound of a headset switch
By using a headset switching current noise cancellation device and utilizing RC delay to control the conduction time of the switching transistor, the problem of current noise caused by inconsistent wiring sequence during plugging and unplugging of national standard and American standard headphones is solved, thus improving the user experience.
Patent Information
- Application Number
- CN202522078117.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-09-26
AI Technical Summary
In the process of plugging and unplugging Chinese standard and American standard headphones, the microphone and ground wires are misconnected due to inconsistent wiring order. This can cause problems such as microphone failure, channel reversal, degraded signal-to-noise ratio, and current surge noise, which are more obvious when switching frequently or when the insertion depth is different.
A headphone switching current noise cancellation device is adopted, including a headphone interface component, an audio driver module, a conduction control component, a switching component, and a delay component. The conduction time of the switching transistor is controlled by RC delay to avoid the generation of current noise.
It effectively solves the problem of electrical noise when switching between Chinese and American standard headphones, improves the user experience, and meets the needs of users at home and abroad.
Smart Images
Figure CN224935758U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of headphone standard switching technology, specifically to a device for eliminating headphone switching current noise. Background Technology
[0002] Currently, with technological advancements, changing market demands, and the widespread adoption of mobile terminals, laptops, tablets, and various portable audio-visual devices, the market demand for headphone jacks is constantly increasing. Among them, the four-segment headphone jack (commonly known as the "four-segment headphone jack") has become one of the mainstream hardware interfaces for audio output. This interface not only transmits audio signals from the left and right channels and ground wires, but also adds the function of transmitting microphone signals, thus enabling headphones not only to be used for listening to music, but also for making calls and recording.
[0003] Currently, four-prong headphone jacks can connect to both Chinese standard (OMTP) and American standard (CTIA) headphones. Due to historical reasons, these two types of headphones have incompatible wiring sequences: OMTP headphones are wired in the order of left channel, right channel, microphone, and ground, while CTIA headphones are wired in the order of left channel, right channel, ground, and microphone. This difference can lead to incompatibility issues when using headphones of different standards. When the headphone plug and the device socket standard are inconsistent, the microphone and ground wire will be connected incorrectly, causing the microphone to malfunction, channel reversal, signal-to-noise ratio degradation, and even an audible "pop / click" electrical surge sound upon plugging and unplugging. Existing technology typically uses a headphone grounding switch to detect the grounding position of the plugged-in headphone in real time and automatically switch between OMTP and CTIA standards to ensure the correct correspondence between the microphone and ground wire.
[0004] Furthermore, the origin of the three-flange headphone jack is closely related to its basic structure and function. With the development of audio technology, three-flange headphones have become the standard configuration for achieving stereo effects. Although four-flange headphones are more powerful in terms of functionality, three-flange headphones are still widely used due to their compatibility and simplicity. In practical use, a four-flange headphone jack can be used with both Chinese and American standard headphones, and is also compatible with the microphone and LIN-OUT functions of a three-flange headphone. A three-flange headphone plug contains three wires: left channel, right channel, and a common wire (ground). A four-flange headphone plug contains four wires: left channel, right channel, microphone, and a common wire, or left channel, right channel, common wire, and microphone. Therefore, a buzzing sound may occur when a three-flange LIN-OUT is connected to a four-flange headphone jack.
[0005] These electrical noises not only affect the user's listening experience, but may also cause potential damage to headphone speaker units, CODEC input stages, or microphone bias circuits.
[0006] In view of the above, this application is hereby submitted. Utility Model Content
[0007] During the implementation of this invention, the inventors discovered that the wiring sequences for OMTP (National Standard Telephone Protocol) and CTIA (Computer-Telephone Association) headphones are incompatible. When the headphone plug and the device socket standard are inconsistent, the microphone and ground wire will be connected incorrectly, causing the microphone to malfunction, channel reversal, signal-to-noise ratio degradation, and even an audible "pop / click" current surge sound at the moment of plugging and unplugging. The inventors further discovered that even with an automatic switching chip, when users frequently switch between OMTP and CTIA headphones, or when the same headphone is inserted to different depths causing the switching circuit to operate multiple times, the headphone grounding switch repeatedly flips, and the charge redistribution at the moment of switching still generates a surge current, resulting in a current sound.
[0008] Furthermore, the inventors discovered that a current noise also occurs when a four-section headphone jack is connected to a three-section LIN-OUT. This is because the four-section headphone jack is first connected to a three-section headphone microphone, and then to a three-section headphone linear output. Since the two three-section headphone plugs are "hot-plugged" into the ground wire and microphone circuitry inside the socket, a sudden change in charge will also be caused, resulting in a current noise.
[0009] This invention provides a device for eliminating the current noise during headset switching, which can at least partially improve the above-mentioned problems.
[0010] To achieve the above objectives, the present invention adopts the following technical solution: A device for eliminating the hum of a headset switching circuit includes: a headphone jack assembly, an audio driver module, a conduction control component, a switching component, and a delay component. The audio driver module is electrically connected to an external controller. The audio driver module is electrically connected to the conduction control component and the switching component through the conduction control component. The switching component is electrically connected to the headphone jack assembly. The audio driver module is electrically connected to the conduction control component through the delay component. The headphone interface component is configured to be pluggable and connected to the headset; the conduction control component is configured to be a conduction or deactivation switching component; the switching component is configured to automatically switch between Chinese standard and American standard; the delay component is configured to delay the conduction time of the fourth switch in the conduction control component so that the switching component is in the deactivation state during the initial period after the headset is inserted.
[0011] In summary, the headset switching current noise cancellation device is based on an audio driver IC. It uses multiple switching transistors and diodes to form a detection switching path. By controlling the enable of the power management IC at different time periods—that is, delaying the supply of power to the headset grounding switch under RC delay control—current noise is avoided. This solves the current noise issue that occurs when switching between OMTP and CTIA standard headsets, meeting the needs of users both domestically and internationally. Furthermore, it also resolves the current noise issues that occur when connecting a three-prong headphone to a four-prong headset jack and when plugging in the microphone first and then the LIN-OUT for the three-prong headphone jack, satisfying the needs of users both domestically and internationally and providing convenient use in various scenarios. Attached Figure Description
[0012] Figure 1 This is a structural diagram of the headset switching current noise cancellation device provided in the first embodiment of this utility model; Figure 2 This is a circuit diagram of the headset switching current noise cancellation device provided in the first embodiment of this utility model; Figure 3 This is a structural diagram of the headset switching current noise cancellation device provided in the second embodiment of this utility model; Figure 4 This is a circuit diagram of the headset switching current noise cancellation device provided in the second embodiment of this utility model; Figure 5 This is a circuit diagram of the audio driver module provided in this utility model embodiment. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0014] This utility model discloses a device for eliminating the current noise during headset switching, which includes: a headphone interface component, an audio driver module, a conduction control component, a switching component, and a delay component. The audio driver module is electrically connected to an external controller. The audio driver module is electrically connected to the conduction control component and the switching component through the conduction control component. The switching component is electrically connected to the headphone interface component. The audio driver module is electrically connected to the conduction control component through the delay component. The headphone interface component is configured to be pluggable and connected to the headset; the conduction control component is configured to be a conduction or deactivation switching component; the switching component is configured to automatically switch between Chinese standard and American standard; the delay component is configured to delay the conduction time of the fourth switch in the conduction control component so that the switching component is in the deactivation state during the initial period after the headset is inserted.
[0015] refer to Figure 1 , Figure 2 , Figure 5 As shown, the first embodiment of this utility model further discloses that the headphone interface assembly is a four-section headphone interface, which is configured to be pluggable and connected to the insertion end of a four-section headset. The conduction control component includes a first switch Q1, a fourth switch Q4, a first diode D1, and a second diode. The output terminal of the audio driver module is electrically connected to the cathode of the first diode D1, and the anode of the first diode D1 is electrically connected to the control terminal of the fourth switch Q4. The first end of the fourth switch Q4 is electrically connected to the output terminal of the audio driver module and the control terminal of the first switch Q1, and the second end of the fourth switch Q4 is grounded. The first end of the first switch Q1 is electrically connected to the output terminal of the audio driver module and the enable terminal of the switching component, and the second end of the first switch Q1 is grounded.
[0016] Preferably, both the first switch Q1 and the fourth switch Q4 are NMOS transistors. The control terminal of the first switch Q1 is the gate of the NMOS transistor, the first terminal of the first switch Q1 is the drain of the NMOS transistor, and the second terminal of the first switch Q1 is the source of the NMOS transistor. The control terminal of the fourth switch Q4 is the gate of the NMOS transistor, the first terminal of the fourth switch Q4 is the drain of the NMOS transistor, and the second terminal of the fourth switch Q4 is the source of the NMOS transistor.
[0017] Preferably, the chip model of the audio driver module is ALC897-VA2-CG.
[0018] Preferably, the switching component includes a power management module and a headphone jack low-level switch. The enable terminal of the power management module is electrically connected to the output terminal of the conduction control component, and the output terminal of the power management module is electrically connected to the voltage input terminal of the headphone jack low-level switch. The headphone jack low-level switch is connected to the headphone jack component. The power management module is model JW7115S-2SOTA, and the headphone jack low-level switch is model SGM2549DYN6G / TR.
[0019] Preferably, the delay component includes a third octet resistor R38 and a second capacitor C2. One end of the third octet resistor R38 is electrically connected to the output terminal of the audio driver module, and the other end of the third octet resistor R38 is electrically connected to one end of the second capacitor C2 and the control terminal of the fourth switch Q4. The other end of the second capacitor C2 is grounded.
[0020] Compared to traditional solutions, the first embodiment of this invention meets the needs of users both domestically and internationally, resolving the issue of electrical noise that occurs when switching between OMTP (Chinese national standard) and CTIA (American standard) headphones. This solution enriches the user experience and caters to diverse usage needs.
[0021] Specifically, in the first embodiment, the device includes a four-section headphone jack, two B5819W Schottky diodes (with advantages such as high speed, low power consumption, and ultra-high frequency), two 2N7002-TP N-channel MOSFETs, an SGM2549DYN6G / TR headphone ground switch (a headphone ground switch manufactured by SGMICRO and several resistors and capacitors, mainly used to solve the compatibility problem of different standard headphone plugs), and a JW7115S-2SOTA power management chip (a power management chip manufactured by JOULWATT). These components are connected to an ALC897-VA2-CG audio sound card driver chip to achieve the switching function between Chinese and American standard headphone plugs. The ALC897-VA2-CG audio sound card driver chip, manufactured by Realtek, implements audio functions through the CPU and is mainly used for high-definition audio encoding and decoding.
[0022] The ALC897-VA2-CG audio sound card driver chip is connected to the CPU. The two B5819W Schottky diodes, the two 2N7002-TP N-channel MOSFETs, the SGM2549DYN6G / TR headphone low-side switch, and the JW7115S-2SOTA power management chip are connected to the ALC897-VA2-CG audio sound card driver chip. One of the B5819W Schottky diodes and the SGM2549DYN6G / TR headphone low-side switch are connected to the four-pole headphone jack, and the JW7115S-2SOTA power management chip and the SGM2549DYN6G / TR headphone low-side switch are connected. Among them, a B5819W Schottky diode and an SGM2549DYN6G / TR headphone grounding switch are connected to the four-section headset interface to realize the interface function. A JW7115S-2SOTA power management chip and an SGM2549DYN6G / TR headphone grounding switch are connected to realize the function of eliminating the current noise that may occur when switching between Gome and American standard headphones.
[0023] Furthermore, the working principle of the headset switching current noise cancellation device involved in the first embodiment is as follows: Figure 2LINE0UT2 is a four-pole headphone jack. According to the circuit diagram, the LINE2JD and MIC2JD signals are connected to a 3.3V power supply. When no four-pole headphones are connected, the signals from MIC2JD to LINE2JD are both at 3.3V, and this line is not conductive. (Where, according to...) Figure 2 It can be seen that MIC2JD and LINE2JD are connected through a 1N5819WB diode. When four earphones are plugged in, the LINE2JD signal voltage output by the ALC897-VA2-CG chip is pulled down to 0V, and the signal line from MIC2JD to LINE2JD is connected. Therefore, plugging in four earphones at this time enables the headset function. At this time, the MIC2-VREFO signal voltage output by the audio IC is 3.3V high level.
[0024] The headphone is connected to a low-level switch, the SGM2549DYN6G / TR model IC, which is an IC that can switch between identifying GEM standard headphones (LINEOUT2 connects to the two signal lines SLEEVECON R and RING2CONR of this IC for identifying GEM standard headphones). The power management chip JW7115S-2SOTA is a current-limiting switch. In actual use, when four-pole headphones are inserted, the third resistor R38 and the second capacitor C2 delay the fourth switch Q4 from conducting. At this time, the MIC2-VREFO signal voltage has already been supplied to the first switch Q1 through resistor R37 and resistor AR2, that is, the drain and source terminals of the first switch Q1 are turned on. The EN signal of JW7115S-2SOTA is grounded, so this switch will not supply voltage to the SGM2549DYN6G / TR model IC to turn it on.
[0025] After the RC delay of resistor R38 and capacitor C2 is completed, the drain and source of the fourth switch Q4 are turned on, meaning the gate of the first switch Q1 is grounded and the drain and source are disconnected. The EN signal of JW7115S-2SOTA is connected to the MIC2-VREFO signal voltage, and the SGM2549DYN6G / TR IC is turned on. The FB5 ferrite bead and AC143 capacitor connected to the MIC signal terminal of this IC also play a role in suppressing current noise, thereby achieving the problem of current noise when switching between GEM standard four-section headphones through delay control.
[0026] In simple terms, the circuit in the first embodiment mainly uses the delay of resistor R38 and capacitor C2 to initially turn off Q4 and turn on Q1, thus turning off the low-level switch connected to the headphones and preventing current from flowing. After the delay ends, Q4 turns on and Q1 turns off, turning on the low-level switch connected to the headphones and allowing them to receive the headset signal normally. This time difference eliminates the current noise. This solves the problem of current noise that occurs when switching between OMTP and CTIA standard headphones.
[0027] refer to Figure 3 , Figure 4 , Figure 5 As shown, the second embodiment of this utility model further discloses that the headphone interface assembly is a first four-section headphone interface and a second four-section headphone interface. The first four-section headphone interface is configured to be pluggably connected to the MIN insertion end of the three-section headset, and the second four-section headphone interface is configured to be pluggably connected to the LIN-OUT insertion end of the three-section headset. The conduction control component includes a first switch Q1, a fourth switch Q4, a three-section switch AQ1, a first diode D1, and a second diode. The output terminal of the audio driver module is electrically connected to the cathode of the first diode D1, and the anode of the first diode D1 is electrically connected to the control terminal of the fourth switch Q4. The first terminal of the fourth switch Q4 is electrically connected to the output terminal of the audio driver module and the control terminal of the first switch Q1, and the second terminal of the fourth switch Q4 is grounded. The first terminal of the first switch Q1 is electrically connected to the output terminal of the audio driver module and the enable terminal of the switching component, and the second terminal of the first switch Q1 is grounded. The control terminal of the three-section switch AQ1 is electrically connected to the insertion detection terminal of the audio driver module, the first terminal of the three-section switch AQ1 is electrically connected to the enable terminal of the switching component, and the second terminal of the three-section switch AQ1 is grounded.
[0028] Preferably, the three-segment switching transistor AQ1 is an NMOS transistor, with the control terminal of AQ1 serving as the gate, the first terminal of AQ1 serving as the drain, and the second terminal of AQ1 serving as the source. Similarly, the first switch Q1 and the fourth switch Q4 are both NMOS transistors. The control terminal of the first switch Q1 serves as the gate, the first terminal of Q1 serves as the drain, and the second terminal of Q1 serves as the source. Likewise, the control terminal of the fourth switch Q4 serves as the gate, the first terminal of Q4 serves as the drain, and the second terminal of Q4 serves as the source.
[0029] Preferably, the chip model of the audio driver module is ALC897-VA2-CG.
[0030] Preferably, the switching component includes a power management module and a headphone jack low-level switch. The enable terminal of the power management module is electrically connected to the output terminal of the conduction control component, and the output terminal of the power management module is electrically connected to the voltage input terminal of the headphone jack low-level switch. The headphone jack low-level switch is connected to the headphone jack component. The power management module is model JW7115S-2SOTA, and the headphone jack low-level switch is model SGM2549DYN6G / TR.
[0031] Preferably, the delay component includes a third octet resistor R38 and a second capacitor C2. One end of the third octet resistor R38 is electrically connected to the output terminal of the audio driver module, and the other end of the third octet resistor R38 is electrically connected to one end of the second capacitor C2 and the control terminal of the fourth switch Q4. The other end of the second capacitor C2 is grounded.
[0032] Compared to traditional solutions, the second embodiment of this utility model meets the usage needs of domestic and international users and offers convenient use in multiple scenarios. It solves the problems of current noise when connecting a three-pronged headphone to a four-pronged microphone jack and current noise when plugging in the microphone first and then the LIN-OUT for the three-pronged headphone jack. This solution enriches the user experience and caters to diverse usage needs.
[0033] Specifically, in the second embodiment, the device comprises an ALC897-VA2-CG audio sound card driver chip, a JW7115S-2SOTA power management chip, an SGM2549DYN6G / TR headphone jack low-side switch, two four-section headphone jacks, three 2N7002-TP N-channel MOSFETs, two B5819W Schottky diodes, and several resistors and capacitors. The ALC897-VA2-CG audio sound card driver chip is connected to the CPU. The two B5819W Schottky diodes, three 2N7002-TP N-channel MOSFETs, the SGM2549DYN6G / TR headphone low-side switch, and the JW7115S-2SOTA power management chip are connected to the ALC897-VA2-CG audio sound card driver chip. One of the B5819W Schottky diodes and the SGM2549DYN6G / TR headphone low-side switch are connected to one of the four-pole headset jacks. The ALC897-VA2-CG audio sound card driver chip is connected to another four-pole headset jack. The JW7115S-2SOTA power management chip and the SGM2549DYN6G / TR headphone low-side switch are connected.
[0034] Specifically, two B5819W Schottky diodes, two 2N7002-TP N-channel MOSFETs, an SGM2549DYN6G / TR headphone grounding switch, and a JW7115S-2SOTA power management chip are connected to an ALC897-VA2-CG audio sound card driver chip to achieve the switching function for GEM (Global Standard) headphones; one 2N7002-TP N-channel MOSFET is connected to the ALC897-VA2-CG audio sound card driver chip and the JW7115S-2SOTA power management chip to achieve the headphone microphone and... The headset features a LIN-OUT identification function; one B5819W Schottky diode and an SGM2549DYN6G / TR headset grounding switch are connected to one of the four-pole headset jacks to implement the LIN-OUT interface function; an ALC897-VA2-CG audio sound card driver chip is connected to another four-pole headset jack to implement the MIC function; a JW7115S-2SOTA power management chip and an SGM2549DYN6G / TR headset grounding switch are connected to eliminate the current noise that may occur when a three-pole headset's LIN-OUT is connected.
[0035] Furthermore, the working principle of the headset switching current noise cancellation device involved in the second embodiment is as follows: According to Figure 4 As can be seen, the LINE2JD and MIC2JD signals are connected to the 3.3V power supply. When the motherboard first inserts the three-prong headphone microphone (MICIN2 in the schematic diagram is the microphone interface), the MIC2-VREFO signal voltage output by the ALC897-VA2-CG chip is 3.3V high level. At this time, the 3.3V high level output by the MIC2JD chip will be pulled low to 0V. Since MIC2ID and LINE2TD are connected through the IN5819WB diode, the signal from MIC2ID to LINE2JD is not conducting at this time.
[0036] LINE OUT2 is a four-prong headphone jack; this jack can connect to three-prong headphones. Figure 4 It can be seen that the SGM2549DYN6G / TR model IC is an IC that can switch to identify GEM standard headphones (LINEOUT2 is connected to LINOUT). This IC identifies the two signal lines of GEM standard headphones: SLEEVECON R and RING2CON R. JW7115S-2SOTA is a current limiting switch. Resistor R38 and capacitor C2 control the fourth switch Q4 to not conduct through the RC circuit delay. At this time, the MIC2-VREFO signal voltage has already been input voltage to the first switch Q1 through resistor R37 and resistor AR2, that is, the drain and source of the first switch Q1 are turned on, and the EN signal of JW7115S-2SOTA is grounded.
[0037] After the delay caused by resistor R38 and capacitor C2 is complete, the drain and source of the fourth switch Q4 are turned on, meaning the gate of the first switch Q1 is grounded and its drain and source are disconnected. The EN signal of JW7115S-2SOTA remains grounded. This is because the three-section headphone LIN-OUT is not connected at this time, and the LINE2 JD signal voltage is still 3.3V high. At this time, the drain and source of the three-section switch AQ1 are turned on, and the EN signal of W7115S-2SOTA is grounded. Therefore, this switch will not supply voltage to the SGM2549DYN6G / TR IC to turn it on.
[0038] Furthermore, when the three-prong headphone LIN-OUT is plugged in, the LINE2 JD signal voltage is pulled down to 0V. At this time, the signal from MIC2JD to LINE2 JD is still not conducting because both are at low levels and do not affect each other. Meanwhile, the drain and source terminals of the three-prong switching transistor AQ1 are disconnected, and the MIC2-VREFO signal voltage is directly supplied from resistor AR2 to the EN signal terminal of JW7115S-2SOTA. The SGM2549DYN6G / TR IC conducts at this time, and the FB5 ferrite bead and AC143 capacitor connected to the MIC signal terminal of this IC also suppress current noise, thus eliminating the current noise problem that occurs when the four-prong headphone jack is connected to the three-prong headphone MIC first and then to the three-prong headphone LIN-OUT.
[0039] In simple terms, the circuit in the second embodiment mainly involves the switching of three transistors, AQ1. Based on Q1 and Q4, when the three-prong headphone LIN-OUT is not inserted, regardless of how Q1 and Q4 are turned on, the EN signal terminal of the JW7115S-2SOTA will not be enabled. Only after the three-prong headphone LIN-OUT is inserted will the three-prong switch AQ1 be turned off, at which point the EN signal terminal of the JW7115S-2SOTA will have the opportunity to be enabled based on the switching of Q1 and Q4. This design provides double protection for the circuit and solves the problem of current noise when connecting the three-prong headphone MIC to the four-prong headphone jack before connecting the three-prong headphone LIN-OUT.
[0040] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A device for eliminating headphone switching current noise, characterized in that, include: The device includes a headphone jack assembly, an audio driver module, a conduction control component, a switching component, and a delay component. The audio driver module is electrically connected to an external controller. The audio driver module is electrically connected to the conduction control component and the switching component through the conduction control component. The switching component is electrically connected to the headphone jack assembly. The audio driver module is electrically connected to the conduction control component through the delay component. The headphone interface component is configured to be pluggable and connected to the headset; the conduction control component is configured to be a conduction or deactivation switching component; the switching component is configured to automatically switch between Chinese standard and American standard; the delay component is configured to delay the conduction time of the fourth switch in the conduction control component so that the switching component is in the deactivation state during the initial period after the headset is inserted.
2. The device for eliminating headphone switching current noise according to claim 1, characterized in that, The headphone jack assembly is a four-section headphone jack, which is configured to be pluggable and connected to the insertion end of a four-section headset.
3. The device for eliminating headphone switching current noise according to claim 2, characterized in that, The conduction control component includes a first switch, a fourth switch, a first diode, and a second diode. The output terminal of the audio driver module is electrically connected to the cathode of the first diode, the anode of the first diode is electrically connected to the control terminal of the fourth switch, the first terminal of the fourth switch is electrically connected to the output terminal of the audio driver module and the control terminal of the first switch, and the second terminal of the fourth switch is grounded. The first terminal of the first switch is electrically connected to the output terminal of the audio driver module and the enable terminal of the switching component, and the second terminal of the first switch is grounded.
4. The device for eliminating headphone switching current noise according to claim 1, characterized in that, The headphone interface assembly comprises a first four-section headphone interface and a second four-section headphone interface. The first four-section headphone interface is configured to be pluggably connected to the MIN plug of the three-section headset, and the second four-section headphone interface is configured to be pluggably connected to the LIN-OUT plug of the three-section headset.
5. The device for eliminating headphone switching current noise according to claim 4, characterized in that, The conduction control component includes a first switching transistor, a fourth switching transistor, a three-section switching transistor, a first diode, and a second diode. The output terminal of the audio driver module is electrically connected to the cathode of the first diode, and the anode of the first diode is electrically connected to the control terminal of the fourth switching transistor. The first terminal of the fourth switching transistor is electrically connected to the output terminal of the audio driver module and the control terminal of the first switching transistor, and the second terminal of the fourth switching transistor is grounded. The first terminal of the first switching transistor is electrically connected to the output terminal of the audio driver module and the enable terminal of the switching component, and the second terminal of the first switching transistor is grounded. The control terminal of the three-section switching transistor is electrically connected to the insertion detection terminal of the audio driver module, the first terminal of the three-section switching transistor is electrically connected to the enable terminal of the switching component, and the second terminal of the three-section switching transistor is grounded.
6. The device for eliminating headphone switching current noise according to claim 5, characterized in that, The three-section switching transistor is an NMOS transistor. The control terminal of the three-section switching transistor is the gate of the NMOS transistor, the first terminal of the three-section switching transistor is the drain of the NMOS transistor, and the second terminal of the three-section switching transistor is the source of the NMOS transistor.
7. The device for eliminating headphone switching current noise according to claim 3 or 5, characterized in that, Both the first and fourth switching transistors are NMOS transistors. The control terminal of the first switching transistor is the gate of the NMOS transistor, the first terminal of the first switching transistor is the drain of the NMOS transistor, and the second terminal of the first switching transistor is the source of the NMOS transistor. The control terminal of the fourth switching transistor is the gate of the NMOS transistor, the first terminal of the fourth switching transistor is the drain of the NMOS transistor, and the second terminal of the fourth switching transistor is the source of the NMOS transistor.
8. The device for eliminating headphone switching current noise according to claim 1, characterized in that, The chip model of the audio driver module is ALC897-VA2-CG.
9. The device for eliminating headphone switching current noise according to claim 1, characterized in that, The switching component includes a power management module and a headphone jack low-level switch. The enable terminal of the power management module is electrically connected to the output terminal of the conduction control component. The output terminal of the power management module is electrically connected to the voltage input terminal of the headphone jack low-level switch. The headphone jack low-level switch is connected to the headphone jack component. The power management module is model JW7115S-2SOTA, and the headphone jack low-level switch is model SGM2549DYN6G / TR.
10. The device for eliminating headphone switching current noise according to claim 3 or 5, characterized in that, The delay component includes a third octet resistor and a second capacitor. One end of the third octet resistor is electrically connected to the output terminal of the audio driver module, and the other end of the third octet resistor is electrically connected to one end of the second capacitor and the control terminal of the fourth switching transistor. The other end of the second capacitor is grounded.