Bluetooth earphone with hearing protection function

Abstract

The utility model discloses a Bluetooth earphone with hearing protection. The Bluetooth earphone comprises a hearing protection sound input, a Bluetooth sound input, a Bluetooth module, a hearing protection module, a Bluetooth sound controller, a hearing protection sound controller and a loudspeaker, the hearing protection sound input and the Bluetooth sound input are sound pickups; the Bluetooth module is used for receiving an audio signal of connection equipment and transmitting the signal to the loudspeaker; bluetooth sound control and hearing protection sound control are used for controlling the size of an audio signal converted from sound input; according to the utility model, the domestic microprocessor is adopted, so that the cost is lower, and the supply is more stable; according to the utility model, a mode of combining hearing protection and the Bluetooth module is adopted, so that the hearing protection device has the functions of hearing protection and audio signal receiving of the Bluetooth connection device at the same time, and a user can select a proper working mode according to the actual situation of himself / herself; working modes of the Bluetooth earphone with hearing protection include a hearing protection mode, a Bluetooth mode and a simultaneous hearing protection and Bluetooth working mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of audio equipment, in particular to a Bluetooth headset with hearing protection. Background Art

[0002] With the rapid development of modern society, many people who engage in heavy physical labor or work in high-noise environments easily neglect the issue of hearing protection. Any sound generated in an industrial environment may affect the hearing health of people in the workplace, such as rotating mechanical equipment and gear transmission friction, cutting and welding, etc. These noises are not only high-frequency but also long-lasting, and the risk of damaging the human ear is relatively high. Therefore, it is particularly important to protect people's hearing health. Traditional wired headphones use cables to connect to portable audio and video devices. The multiple entanglements of the cables during use will also make them more susceptible to damage, greatly reducing the entire use time of traditional wired headphones. Secondly, the portability and flexibility of traditional wired headphones are unsatisfactory. Therefore, while ensuring the performance of the headphones, in order to provide users with a better comfort experience, their portability and flexibility should be improved.

[0003] Currently, there are a variety of devices on the market to reduce the damage caused by noise to the ears. The most commonly used are noise-canceling earmuffs, which filter out most ambient noise and industrial noise, a form of passive noise reduction. With technological advancements, some products have also emerged that utilize active noise reduction technology. These rely on high-performance imported chips combined with intelligent algorithms to achieve noise reduction, thereby achieving the purpose of hearing protection. Driven by policies, the quality of Bluetooth headsets is guaranteed, and production is guaranteed. At the same time, policies also encourage technological innovation, enhance product functionality and performance, and continuously improve the industry chain and manufacturing technology. This has led to the rapid development of Bluetooth headsets. To provide consumers with a better experience, a variety of better Bluetooth headsets suitable for different application scenarios have also appeared on the market.

[0004] Hearing protection earphones on the market, such as noise-canceling earmuffs, use physical properties to isolate external noise from the ears. This is achieved primarily through tighter headband designs, acoustic optimization of the cavity connecting to the ear, and the inclusion of sound-absorbing materials inside the earmuffs. This physical isolation achieves noise reduction and isolation. Active noise reduction products utilize digital processing principles. They first employ physical isolation or in-ear designs that fit tightly into the ear canal to block external sound. Then, using a pickup to detect the external noise source signal, the product generates a reverse pulse internally to cancel the noise, achieving the desired effect.

[0005] The hearing protection headphones on the market have single functions, poor portability and flexibility, which makes the scope of application of hearing protection headphones too limited.

[0006] Looking at the hearing protection earphones currently on the market, passive noise reduction products are generally large and inconvenient to carry around. Wearing them for extended periods can cause discomfort, especially in hot weather. Furthermore, outside sounds are largely inaudible, posing a safety hazard in certain industrial environments. This type of noise reduction doesn't offer adjustable or controllable volume. Active noise reduction earphones utilize imported, high-performance digital processing chips or specialized chips, combined with external circuitry, to achieve this active noise reduction effect. These products are expensive, have a narrow noise reduction depth, and a limited volume control range. The use of imported or specialized chips can make supply difficult when the supply chain is strained, impacting product launch. Analyzing hearing protection earphones on the market, passive noise reduction products, solely focused on noise reduction, are overly specialized and lack practical applicability. To address these issues, we have proposed a Bluetooth earphone with hearing protection. Utility Model Content

[0007] The purpose of the utility model is to provide a Bluetooth headset with hearing protection to solve the existing problems.

[0008] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0009] The utility model is a Bluetooth headset with hearing protection, comprising a hearing protection sound input, a Bluetooth sound input, a Bluetooth module, a hearing protection module, a Bluetooth sound control, a hearing protection sound control, and a speaker;

[0010] The hearing protection sound input is connected to an external microphone to convert external environmental sounds into audio signals;

[0011] The Bluetooth sound input is a pickup inside the Bluetooth module. When the Bluetooth headset is making a voice call, the voice signal is converted into an audio signal and sent to the connected Bluetooth device through the Bluetooth module.

[0012] The Bluetooth module receives audio signals from connected devices and transmits the signals to the speakers, or transmits audio signals picked up by Bluetooth sound input to the connected Bluetooth device;

[0013] The Bluetooth audio control is used to control the volume of the audio signal transmitted by the Bluetooth connected device, and the corresponding volume level is set by the "+ / -" button on the Bluetooth module;

[0014] The hearing protection sound control controls the volume of the audio signal converted from the hearing protection sound input, and the corresponding volume level is set by the "+ / -" button on the hearing protection module;

[0015] The speaker restores the sound of the Bluetooth module, or when the hearing protection module is working, it processes the external sound and restores it for human ears.

[0016] Furthermore, the Bluetooth module includes a Bluetooth sound input, Bluetooth audio control, a Bluetooth microprocessor, and a speaker; the audio signal of the mobile terminal is transmitted to the Bluetooth microprocessor via Bluetooth, and then transmitted to the speaker for restoration; when a voice call is made, the Bluetooth sound input collects the sound and feeds it back to the mobile terminal via the Bluetooth microprocessor; the Bluetooth audio control buttons volume + and volume - can adjust the volume, and the power button turns the Bluetooth module on and off;

[0017] The speaker module is a common unit of the Bluetooth module and the hearing protection module. When each module works alone or simultaneously, it is used to restore the sound.

[0018] The Bluetooth module can be interconnected with mobile devices to realize the Bluetooth headset functions of making calls, listening to music, and adjusting the volume;

[0019] The hearing protection module can protect human hearing and can be adjusted by pressing buttons to select different levels.

[0020] The hearing protection module and the Bluetooth module can work independently, and can work in a hearing protection mode, a Bluetooth mode, or a hearing protection and Bluetooth mode working simultaneously.

[0021] Furthermore, the hearing protection module includes a sound input module, a preamplifier module, an AGC circuit module, a balancing circuit module, a volume control module, a power amplifier module, a speaker module and a power circuit module; the output end of the sound input module is electrically connected to the input end of the preamplifier module and the input end of the AGC circuit module respectively; the output end of the preamplifier module is electrically connected to the output end of the AGC circuit module, the connection port is electrically connected to the input end of the balancing circuit module, and the output end of the balancing circuit module is electrically connected to the port of the volume control module; the port of the volume control module is electrically connected to the input end of the power amplifier module, and the output end of the power amplifier module is electrically connected to the positive terminal of the speaker;

[0022] The preamplifier is used to amplify weak audio signals for subsequent processing;

[0023] The AGC circuit is an automatic gain control circuit that automatically adjusts the gain of the preamplifier circuit when the received signal exceeds the designed value, so that the output signal is limited to the rated range;

[0024] The preamplifier, AGC circuit, amplification or detection circuit composed of discrete transistor components, or a circuit with an integrated circuit chip as the core to achieve the same function;

[0025] The balancing circuit is used to ensure that the left and right balance of two speakers is maintained within a reasonable range when they are used simultaneously.

[0026] The volume control circuit controls the volume of the signal output by the balancing circuit and sets the corresponding volume level according to the status of the external button or touch to meet different application scenarios;

[0027] The power amplifier amplifies the signal to meet the needs of driving the speaker;

[0028] The speaker is used to restore the input signal and includes the application of multiple speakers.

[0029] Furthermore, the sound input module includes a microphone, a resistor R5, a resistor R6, and a capacitor C7. The positive electrode of the microphone is connected in series with the resistors R5 and R6 and then connected to a regulated power supply, and the negative electrode is grounded to ensure normal operation of the microphone.

[0030] Furthermore, the preamplifier module includes a transistor Q2, a transistor Q3, a resistor R7, a resistor R8, a resistor R12, a capacitor C6, and a capacitor C2. The emitters of the transistors Q2 and Q3 are grounded, the resistor R7 is connected to the collector of the transistor Q2 and the regulated power supply, the resistor R12 is connected to the collector of the transistor Q3 and the regulated power supply, the resistor R8 is connected to the collector and the base of the transistor Q3, the capacitor C6 is connected to the collector of the transistor Q2 and the base of the transistor Q3, and the capacitor C2 is connected to the collector of the transistor Q3 and the output end of the AGC circuit module to ensure the normal operation of the preamplifier module, so that the audio signal converted by the sound input module is amplified by the preamplifier module and then output to the balanced circuit module.

[0031] Furthermore, the volume control module includes an execution unit, a control signal unit, a prompt sound unit, a voltage detection unit and headphone volume control software;

[0032] The execution unit includes a transistor Q1 and a resistor R3, the control signal unit includes a microprocessor, a resistor R1, a resistor R2, a resistor RA, a resistor RB, a resistor RC, a resistor RD, a resistor RE, a resistor RF, a resistor RG, a resistor RS1, a resistor RS2, a capacitor C1, a button S1, a button S2 and a touch button J1, the prompt sound unit includes a resistor R20 and a capacitor C15, and the voltage detection unit includes R1 and R2;

[0033] By detecting the key or touch status and coordinating with the hardware circuit, the volume can be adjusted. The microprocessor needs to do software design. The key S1 is connected to the UP pin of the microprocessor and the ground, the key S2 is connected to the DOWN pin of the microprocessor and the ground, and the touch key J1 is connected to the TOUCH pin of the microprocessor. The volume can be adjusted by pressing the key or touching the key; one end of the capacitor C15 is connected to the K8 pin of the microprocessor, and the other end is connected to the positive pole of the speaker 11 after being connected in series with the resistor R20 to output the prompt tone;

[0034] The signal output end of the control signal unit is connected in series with the resistor R3 in the execution unit to the base of the transistor Q1, the emitter of the transistor Q3 is grounded, and the collector is connected to the output end of the balance circuit module to control the sound level; the resistors RA, RB, RC, RD, RE, RF, and RG in the control signal unit are volume gear resistors, one end of which is respectively connected to the corresponding K1, K2, K3, K4, K5, K6, and K7 pins of the microprocessor, and the other end is connected to the signal output end of the control signal unit. The resistor RS1 connects the signal output end of the control signal unit with the reference power supply, and the resistor RS2 connects the signal output end of the control signal unit with the ground, that is, by clicking the buttons S1 and S2 or touching the button J1 to control the working status of the corresponding K1, K2, K3, K4, K5, K6, and K7 pins of the microprocessor 32 to realize the volume adjustment function, and a prompt sound is given when the volume is at the lowest or highest level.

[0035] Furthermore, the AGC circuit module includes a transistor Q4, a diode D1, a resistor R10, a resistor R17, a resistor R18, and a capacitor C12, wherein the cathode of the diode D1 is connected to the base of the transistor Q4 and the output end of the preamplifier module, the anode of the diode D1 is connected to the emitter of the transistor Q4, one end of the capacitor C12 and grounded, the other end of the capacitor C12 is connected in series with the resistor R18 and connected to the collector of the transistor, the connection port of the capacitor C12 and the resistor R18 is connected to the resistor R10 and one end of the resistor R17, the other end of the resistor R10 is connected to the voltage-stabilized power supply, and the other end of the resistor R17 is connected to the base of the transistor Q2 to ensure the normal operation of the AGC circuit module;

[0036] The balancing circuit module includes an adjustable resistor R14, which is connected in series between the preamplifier module and the volume control module; the speaker module includes a speaker, the negative electrode of the speaker is grounded, and the positive electrode is connected to the resistor R16;

[0037] The power amplifier module includes a power amplifier chip, a resistor R4, a resistor R9, a resistor R11, a resistor R15, a resistor R16, a capacitor C4, a capacitor C9, a capacitor C10, and a capacitor C11. The INB- pin of the power amplifier chip is connected in series with the capacitor C4 and the resistor R4 and then connected to the output end of the volume control module. The OUTB pin of the power amplifier chip is connected in series with the capacitor C11 and the resistor R16 and then connected to the positive pole of the speaker. The INB+ and INA+ pins of the power amplifier chip are connected to one end of the resistor R11 and the capacitor C9 and then connected in series with the resistor R9 to the positive pole of the battery. The other ends of the resistor R11 and the capacitor C9 are connected in parallel and then grounded. The INB- and OUTB pins of the power amplifier chip are connected in parallel with the resistor R15 and the capacitor C10 to ensure the normal operation of the power amplifier module.

[0038] An electrical connection point for a Bluetooth headset with hearing protection, including a left channel speaker positive electrode, a left channel speaker negative electrode, a right channel speaker positive electrode, a right channel speaker negative electrode, a left channel pickup positive electrode, a left channel pickup negative electrode, a right channel pickup positive electrode, a right channel pickup negative electrode, a lithium battery positive electrode, and a lithium battery negative electrode;

[0039] Connect the left earphone's left channel pickup (positive), left channel pickup (negative), left channel speaker (positive), and left channel speaker (negative) to the left channel pickup (positive), left channel speaker (negative), and left channel speaker (positive) on the back of the hearing protection PCBA to ensure normal operation of the left earphone.

[0040] Connect the right earphone's right channel pickup positive, right channel pickup negative, right channel speaker positive, and right channel speaker negative to the right end of the hearing protection Bluetooth PCBA to ensure normal operation of the right earphone.

[0041] The right channel pickup positive pole, right channel pickup negative pole, right channel speaker positive pole, right channel speaker negative pole, lithium battery positive pole, lithium battery negative pole, left channel speaker positive pole, left channel speaker negative pole of the hearing protection PCBA should be connected accordingly with the right channel pickup positive pole, right channel pickup negative pole, right channel speaker positive pole, right channel speaker negative pole, lithium battery positive pole, lithium battery negative pole, left channel speaker positive pole, left channel speaker negative pole of the Bluetooth PCBA to ensure the normal operation of the entire hearing protection Bluetooth headset.

[0042] The utility model has the following beneficial effects:

[0043] The utility model adopts a domestically produced microprocessor, which can completely replace headphones designed with imported chips, and has lower costs and more stable supply.

[0044] This utility model combines hearing protection with Bluetooth modules, so that it has the functions of hearing protection and receiving audio signals from Bluetooth connected devices. Users can choose the appropriate working mode according to their actual situation. The working modes of Bluetooth headsets with hearing protection are divided into three modes: hearing protection mode, Bluetooth mode, and hearing protection and Bluetooth working simultaneously.

[0045] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 This is a schematic diagram of the overall structure of a Bluetooth headset with hearing protection;

[0048] Figure 2 This is a schematic diagram of the structure of a Bluetooth headset with hearing protection;

[0049] Figure 3 This is a structural diagram of the hearing protection module in the present utility model;

[0050] Figure 4 This is a schematic diagram of the electrical connections of a Bluetooth headset with hearing protection;

[0051] Figure 5 This is a schematic diagram of the circuit structure of the hearing protection module in the present utility model;

[0052] Figure 6 This is a schematic diagram of the volume control circuit structure of the hearing protection module in the present utility model;

[0053] Figure 7 This is a schematic diagram of the circuit structure of the Bluetooth module in this utility model. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0056] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0057] See also Figure 1-Figure 7 As shown, the utility model is a Bluetooth headset with hearing protection, including a hearing protection sound input 1, a Bluetooth sound input 13, a Bluetooth module 14, a hearing protection module 15, a Bluetooth sound control 16, a hearing protection sound control 9, and speakers 11 / 12;

[0058] Hearing protection sound input 1 is connected to an external microphone to convert external ambient sound into audio signals;

[0059] The Bluetooth sound input 13 is the sound pickup inside the Bluetooth module 14. When the Bluetooth headset is making a voice call, it converts the voice signal into an audio signal and sends it to the connected Bluetooth device through the Bluetooth module 14.

[0060] The Bluetooth module 14 receives audio signals from connected devices and transmits the signals to the speakers 11 / 12, or transmits the audio signals picked up by the Bluetooth sound input 13 to the connected Bluetooth device;

[0061] The Bluetooth audio control 16 is used to control the volume of the audio signal transmitted by the Bluetooth connected device, and the corresponding volume level is set by the "+ / -" button on the Bluetooth module 14;

[0062] The hearing protection sound control 9 controls the volume of the audio signal converted by the hearing protection sound input 1, and the corresponding volume level is set by the "+ / -" button on the hearing protection module 15;

[0063] The speakers 11 / 12 restore the sound of the Bluetooth module 14, or when the hearing protection module 15 is working, the external sound enters the protection process and restores it for human ears to use.

[0064] Among them, the Bluetooth module 14 includes a Bluetooth sound input 13, a Bluetooth audio control 16, a Bluetooth microprocessor 17, and speakers 11 / 12; the audio signal of the mobile terminal is transmitted to the Bluetooth microprocessor 17 via Bluetooth, and then transmitted to the speakers 11 / 12 for restoration; when a voice call is made, the Bluetooth sound input 13 collects the sound and feeds it back to the mobile terminal through the Bluetooth microprocessor 17; the Bluetooth audio control 16 buttons volume + and volume - can adjust the volume, and the power button turns the Bluetooth module 14 on and off;

[0065] The speaker module 11 / 12 is a common unit of the Bluetooth module 14 and the hearing protection module 15. When each module works alone or simultaneously, it is responsible for restoring the sound.

[0066] The Bluetooth module 14 can realize interconnection with mobile devices and realize the Bluetooth headset function of making calls, listening to music, and adjusting the volume;

[0067] The hearing protection module 15 can protect human hearing and can adjust the gears and select different levels by pressing buttons;

[0068] The hearing protection module 15 and the Bluetooth module 14 can both work independently, and can work in a hearing protection mode, a Bluetooth mode, or a hearing protection and Bluetooth mode working simultaneously.

[0069] Among them, the hearing protection module 15 includes a hearing protection sound input module 1 / 5, a preamplifier module 2 / 6, an AGC circuit module 3 / 7, a balancing circuit module 4 / 8, a volume control module 9, a power amplifier module 10, a speaker 11 / 12 module and a power circuit module 13; the output end of the hearing protection sound input module 1 is electrically connected to the input end of the preamplifier module and the input end of the AGC circuit module respectively; the output end of the preamplifier module 2 is electrically connected to the output end of the AGC circuit module 3, and the connection port is electrically connected to the input end of the balancing circuit module 4, and the output end of the balancing circuit module 4 is electrically connected to the port of the volume control module 9; the port of the volume control module 9 is electrically connected to the input end of the power amplifier module 10, and the output end of the power amplifier module 10 is electrically connected to the positive end of the speaker 11 / 12;

[0070] The preamplifier module 2 / 6 amplifies weak audio signals for subsequent processing;

[0071] AGC circuit module 3 / 7 is an automatic gain control circuit. When the received signal exceeds the design value, it automatically adjusts the gain of the preamplifier circuit to limit the output signal to the rated range.

[0072] Preamplifier module 2 / 6, AGC circuit module 3 / 7, an amplifier or detector circuit composed of discrete transistor components, or a circuit with an integrated circuit chip as the core to achieve the same function;

[0073] The function of the balance circuit module 4 / 8 is to ensure that the left and right balance of the two speakers 11 / 12 is maintained within a reasonable range when the two speakers 11 / 12 are used at the same time;

[0074] The volume control circuit module 9 controls the volume of the signal output by the balance circuit module 4 and sets the corresponding volume level according to the status of the external button or touch to meet different application scenarios;

[0075] The power amplifier module 10 amplifies the signal to meet the needs of driving the speakers 11 / 12;

[0076] The speaker 11 / 12 module restores the input signal and includes the application of multiple speakers.

[0077] Among them, the hearing protection sound input 1 module includes a pickup, resistors R5, R6, and capacitor C7. The positive pole of the pickup is connected in series with resistors R5 and R6 and then connected to a regulated power supply, and the negative pole is grounded to ensure the normal operation of the pickup.

[0078] Among them, the preamplifier module 2 includes a transistor Q2, a transistor Q3, a resistor R7, a resistor R8, a resistor R12, a capacitor C6, and a capacitor C2. The emitters of the transistors Q2 and Q3 are grounded, the resistor R7 is connected to the collector of the transistor Q2 and the regulated power supply, the resistor R12 is connected to the collector of the transistor Q3 and the regulated power supply, the resistor R8 is connected to the collector and base of the transistor Q3, the capacitor C6 is connected to the collector of the transistor Q2 and the base of the transistor Q3, and the capacitor C2 is connected to the collector of the transistor Q3 and the output end of the AGC circuit module to ensure the normal operation of the preamplifier module, so that the audio signal converted by the hearing protection sound input 1 module is amplified by the preamplifier module and then output to the balanced circuit module.

[0079] The volume control module 9 includes an execution unit 34, a control signal unit 38, a prompt sound unit 35, a voltage detection unit 31 and headphone volume control software;

[0080] The execution unit 34 includes a transistor Q1 and a resistor R3. The control signal unit 38 includes a microprocessor 32, a resistor R1, a resistor R2, a resistor RA, a resistor RB, a resistor RC, a resistor RD, a resistor RE, a resistor RF, a resistor RG, a resistor RS1, a resistor RS2, a capacitor C1, a button S1, a button S2, and a touch button J1. The prompt sound unit 35 includes a resistor R20 and a capacitor C15. The voltage detection unit 31 includes R1 and R2.

[0081] By detecting the key or touch status and coordinating with the hardware circuit, the volume can be adjusted. The microprocessor 32 needs to be designed with software. The key S1 is connected to the UP pin of the microprocessor 32 and the ground, the key S2 is connected to the DOWN pin of the microprocessor 32 and the ground, and the touch key J1 is connected to the TOUCH pin of the microprocessor 32. The volume can be adjusted by pressing the key or touching the key; one end of the capacitor C15 is connected to the K8 pin of the microprocessor 32, and the other end is connected in series with the resistor R20 and then connected to the positive terminal of the speaker 11 to output the prompt tone;

[0082] The signal output end of the control signal unit 38 is connected in series with the resistor R3 in the execution unit 34 to the base of the transistor Q1, the emitter of the transistor Q3 is grounded, and the collector is connected to the output end of the balancing circuit module 4 / 8 to control the sound level; among them, the resistors RA, RB, RC, RD, RE, RF, and RG in the control signal unit are volume gear resistors, one end of which is respectively connected to the corresponding K1, K2, K3, K4, K5, K6, and K7 pins of the microprocessor 32, and the other end is connected to the signal output end of the control signal unit. The resistor RS1 connects the signal output end of the control signal unit to the reference power supply, and the resistor RS2 connects the signal output end of the control signal unit to the ground, that is, by clicking the buttons S1 and S2 or touching the button J1, the working state of the corresponding K1, K2, K3, K4, K5, K6, and K7 pins of the microprocessor 32 is controlled to realize the volume adjustment function, and a prompt sound is given when the volume is at the lowest or highest level.

[0083] Among them, the AGC circuit module 3 includes a transistor Q4, a diode D1, a resistor R10, a resistor R17, a resistor R18, and a capacitor C12. The cathode of the diode D1 is connected to the base of the transistor Q4 and the output end of the preamplifier module 2, the anode of the diode D1 is connected to the emitter of the transistor Q4, one end of the capacitor C12 and grounded, the other end of the capacitor C12 is connected in series with the resistor R18 and connected to the collector of the transistor, the connection port of the capacitor C12 and the resistor R18 is connected to one end of the resistor R10 and the resistor R17, the other end of the resistor R10 is connected to the voltage-stabilized power supply, and the other end of the resistor R17 is connected to the base of the transistor Q2 to ensure the normal operation of the AGC circuit module 3;

[0084] The balance circuit module 4 includes an adjustable resistor R14, which is connected in series between the preamplifier module 2 and the volume control module 9; the speaker module 11 includes a speaker, the negative electrode of the speaker is grounded, and the positive electrode is connected to the resistor R16;

[0085] The power amplifier 10 module includes a power amplifier chip, resistor R4, resistor R9, resistor R11, resistor R15, resistor R16, capacitor C4, capacitor C9, capacitor C10, and capacitor C11. The INB- pin of the power amplifier chip is connected in series with capacitor C4 and resistor R4 and then connected to the output end of the volume control module 9. The OUTB pin of the power amplifier chip is connected in series with capacitor C11 and resistor R16 and then connected to the positive pole of the speaker. The INB+ and INA+ pins of the power amplifier chip are connected to one end of the resistor R11 and capacitor C9 and then connected in series with resistor R9 to the positive pole of the battery. The other ends of the resistor R11 and capacitor C9 are connected in parallel and then grounded. The INB- and OUTB pins of the power amplifier chip are connected in parallel with resistor R15 and capacitor C10 to ensure the normal operation of the power amplifier module 10.

[0086] The electrical connection points of the Bluetooth headset with hearing protection of this embodiment include the positive electrode of the left channel speaker, the negative electrode of the left channel speaker, the positive electrode of the right channel speaker, the negative electrode of the right channel speaker, the positive electrode of the left channel pickup, the negative electrode of the left channel pickup, the positive electrode of the right channel pickup, the negative electrode of the right channel pickup, the positive electrode of the lithium battery, and the negative electrode of the lithium battery;

[0087] Connect the left earphone's left channel pickup (positive), left channel pickup (negative), left channel speaker (positive), and left channel speaker (negative) to the left channel pickup (positive), left channel speaker (negative), and left channel speaker (positive) on the back of the hearing protection PCBA to ensure normal operation of the left earphone.

[0088] Connect the right earphone's right channel pickup positive, right channel pickup negative, right channel speaker positive, and right channel speaker negative to the right end of the hearing protection Bluetooth PCBA to ensure normal operation of the right earphone.

[0089] The right channel pickup positive pole, right channel pickup negative pole, right channel speaker positive pole, right channel speaker negative pole, lithium battery positive pole, lithium battery negative pole, left channel speaker positive pole, left channel speaker negative pole of the hearing protection PCBA should be connected accordingly with the right channel pickup positive pole, right channel pickup negative pole, right channel speaker positive pole, right channel speaker negative pole, lithium battery positive pole, lithium battery negative pole, left channel speaker positive pole, left channel speaker negative pole of the Bluetooth PCBA to ensure the normal operation of the entire hearing protection Bluetooth headset.

[0090] What needs to be said further is:

[0091] A Bluetooth headset with hearing protection has three operating modes:

[0092] The hearing protection module 15 is in hearing protection mode when its power switch is turned on and the Bluetooth power button is turned off;

[0093] The hearing protection module 15 is in Bluetooth mode when its power switch is off and its Bluetooth power button is on.

[0094] The power switch of the hearing protection module 15 is turned on, and the Bluetooth power button is turned on, that is, it is in the hearing protection and Bluetooth modes at the same time.

[0095] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0096] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A Bluetooth headset with hearing protection, characterized by: Including hearing protection sound input, Bluetooth sound input, Bluetooth module, hearing protection module, Bluetooth sound control, hearing protection sound control, speaker; The hearing protection sound input is connected to an external microphone to convert external environmental sounds into audio signals; The Bluetooth sound input is a pickup inside the Bluetooth module. When the Bluetooth headset is making a voice call, the voice signal is converted into an audio signal and sent to the connected Bluetooth device through the Bluetooth module. The Bluetooth module receives audio signals from connected devices and transmits the signals to the speakers, or transmits audio signals picked up by Bluetooth sound input to the connected Bluetooth device; The Bluetooth audio control is used to control the volume of the audio signal transmitted by the Bluetooth connected device. The corresponding volume level is set by the "+ / -" button on the Bluetooth module; The hearing protection sound control controls the volume of the audio signal converted from the hearing protection sound input, and the corresponding volume level is set by the "+ / -" button on the hearing protection module; The speaker restores the sound of the Bluetooth module, or when the hearing protection module is working, it protects and processes the external sound and restores it for human ears.

2. A Bluetooth headset with hearing protection according to claim 1, characterized in that: The Bluetooth module includes a Bluetooth sound input, Bluetooth audio control, a Bluetooth microprocessor, and a speaker. The audio signal of the mobile terminal is transmitted to the Bluetooth microprocessor via Bluetooth, and then transmitted to the speaker for restoration. When a voice call is in progress, the Bluetooth sound input collects the sound and feeds it back to the mobile terminal through the Bluetooth microprocessor. The Bluetooth audio control buttons volume + and volume - can adjust the volume, and the power button turns the Bluetooth module on and off. The speaker module is a common unit of the Bluetooth module and the hearing protection module. When each module works alone or simultaneously, it is used to restore the sound. The Bluetooth module can be interconnected with mobile devices to realize the Bluetooth headset functions of making calls, listening to music, and adjusting the volume; The hearing protection module can protect human hearing and can be adjusted by pressing buttons to select different levels. The hearing protection module and the Bluetooth module can work independently, and can work in a hearing protection mode, a Bluetooth mode, or a hearing protection and Bluetooth mode working simultaneously.

3. The Bluetooth headset with hearing protection according to claim 1, characterized in that: The hearing protection module includes a sound input module, a preamplifier module, an AGC circuit module, a balancing circuit module, a volume control module, a power amplifier module, a speaker module and a power circuit module; the output end of the sound input module is electrically connected to the input end of the preamplifier module and the input end of the AGC circuit module respectively; the output end of the preamplifier module is electrically connected to the output end of the AGC circuit module, the connection port is electrically connected to the input end of the balancing circuit module, and the output end of the balancing circuit module is electrically connected to the port of the volume control module; the port of the volume control module is electrically connected to the input end of the power amplifier module, and the output end of the power amplifier module is electrically connected to the positive terminal of the speaker; The preamplifier is used to amplify weak audio signals for subsequent processing; The AGC circuit is an automatic gain control circuit that automatically adjusts the gain of the preamplifier circuit when the received signal exceeds the designed value, so that the output signal is limited to the rated range; The preamplifier, AGC circuit, amplification or detection circuit composed of discrete transistor components, or a circuit with an integrated circuit chip as the core to achieve the same function; The balancing circuit is used to ensure that the left and right balance of two speakers is maintained within a reasonable range when they are used simultaneously. The volume control circuit controls the volume of the signal output by the balancing circuit and sets the corresponding volume level according to the status of the external button or touch to meet different application scenarios; The power amplifier amplifies the signal to meet the needs of driving the speaker; The speaker is used to restore the input signal and includes the application of multiple speakers.

4. The Bluetooth headset with hearing protection according to claim 3, characterized in that: The sound input module includes a microphone, resistors R5 and R6, and a capacitor C7. The positive electrode of the microphone is connected in series with the resistors R5 and R6 and then connected to a regulated power supply, and the negative electrode is grounded to ensure normal operation of the microphone.

5. The Bluetooth headset with hearing protection according to claim 3, characterized in that: The preamplifier module includes a transistor Q2, a transistor Q3, a resistor R7, a resistor R8, a resistor R12, a capacitor C6, and a capacitor C2. The emitters of the transistors Q2 and Q3 are grounded, the resistor R7 is connected to the collector of the transistor Q2 and the regulated power supply, the resistor R12 is connected to the collector of the transistor Q3 and the regulated power supply, the resistor R8 is connected to the collector and the base of the transistor Q3, the capacitor C6 is connected to the collector of the transistor Q2 and the base of the transistor Q3, and the capacitor C2 is connected to the collector of the transistor Q3 and the output end of the AGC circuit module to ensure the normal operation of the preamplifier module, so that the audio signal converted by the sound input module is amplified by the preamplifier module and then output to the balanced circuit module.

6. The Bluetooth headset with hearing protection according to claim 3, characterized in that: The volume control module includes an execution unit, a control signal unit, a prompt sound unit, a voltage detection unit and headphone volume control software; The execution unit includes a transistor Q1 and a resistor R3, the control signal unit includes a microprocessor, a resistor R1, a resistor R2, a resistor RA, a resistor RB, a resistor RC, a resistor RD, a resistor RE, a resistor RF, a resistor RG, a resistor RS1, a resistor RS2, a capacitor C1, a button S1, a button S2 and a touch button J1, the prompt sound unit includes a resistor R20 and a capacitor C15, and the voltage detection unit includes R1 and R2; By detecting the key or touch status and coordinating with the hardware circuit, the volume can be adjusted. The microprocessor needs to do software design. The key S1 is connected to the UP pin of the microprocessor and the ground, the key S2 is connected to the DOWN pin of the microprocessor and the ground, and the touch key J1 is connected to the TOUCH pin of the microprocessor. The volume can be adjusted by pressing the key or touching the key; one end of the capacitor C15 is connected to the K8 pin of the microprocessor, and the other end is connected to the positive pole of the speaker 11 after being connected in series with the resistor R20 to output the prompt tone; The signal output end of the control signal unit is connected in series with the resistor R3 in the execution unit to the base of the transistor Q1, the emitter of the transistor Q3 is grounded, and the collector is connected to the output end of the balance circuit module to control the sound level; the resistors RA, RB, RC, RD, RE, RF, and RG in the control signal unit are volume gear resistors, one end of which is respectively connected to the corresponding K1, K2, K3, K4, K5, K6, and K7 pins of the microprocessor, and the other end is connected to the signal output end of the control signal unit. The resistor RS1 connects the signal output end of the control signal unit with the reference power supply, and the resistor RS2 connects the signal output end of the control signal unit with the ground, that is, by clicking the buttons S1 and S2 or touching the button J1 to control the working status of the corresponding K1, K2, K3, K4, K5, K6, and K7 pins of the microprocessor 32 to realize the volume adjustment function, and a prompt sound is given when the volume is at the lowest or highest level.

7. The Bluetooth headset with hearing protection according to claim 3, characterized in that: The AGC circuit module includes a transistor Q4, a diode D1, a resistor R10, a resistor R17, a resistor R18, and a capacitor C12, wherein the cathode of the diode D1 is connected to the base of the transistor Q4 and the output end of the preamplifier module, the anode of the diode D1 is connected to the emitter of the transistor Q4, one end of the capacitor C12 and grounded, the other end of the capacitor C12 is connected in series with the resistor R18 and connected to the collector of the transistor, the connection port of the capacitor C12 and the resistor R18 is connected to one end of the resistor R10 and the resistor R17, the other end of the resistor R10 is connected to a voltage-stabilized power supply, and the other end of the resistor R17 is connected to the base of the transistor Q2 to ensure the normal operation of the AGC circuit module; The balancing circuit module includes an adjustable resistor R14, which is connected in series between the preamplifier module and the volume control module; the speaker module includes a speaker, the negative electrode of the speaker is grounded, and the positive electrode is connected to the resistor R16; The power amplifier module includes a power amplifier chip, a resistor R4, a resistor R9, a resistor R11, a resistor R15, a resistor R16, a capacitor C4, a capacitor C9, a capacitor C10, and a capacitor C11. The INB- pin of the power amplifier chip is connected in series with the capacitor C4 and the resistor R4 and then connected to the output end of the volume control module. The OUTB pin of the power amplifier chip is connected in series with the capacitor C11 and the resistor R16 and then connected to the positive pole of the speaker. The INB+ and INA+ pins of the power amplifier chip are connected to one end of the resistor R11 and the capacitor C9 and then connected in series with the resistor R9 to the positive pole of the battery. The other ends of the resistor R11 and the capacitor C9 are connected in parallel and then grounded. The INB- and OUTB pins of the power amplifier chip are connected in parallel with the resistor R15 and the capacitor C10 to ensure the normal operation of the power amplifier module.

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