Head-mounted Bluetooth earphone supporting bass enhancement loudspeaker
By introducing bass-enhanced vibrating speakers and low-pass filters into headphones, the problem of poor sound quality of single-sided speakers is solved, achieving better bass effect and sound quality experience.
Patent Information
- Application Number
- CN202423073201.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-12-13
AI Technical Summary
The existing head-mounted Bluetooth headsets adopt a single-sided single speaker design, which has poor sound quality, especially in terms of bass effects, which is difficult to meet user needs.
Two speaker systems are adopted, including ordinary speakers and bass-enhanced vibrating speakers, and bass-enhanced bass effects are enhanced by low-pass filters and audio power amplifiers, processing full-band and low-band audio signals respectively.
It significantly improves the bass effect of the head-on Bluetooth headset and provides a richer sound quality experience.
Smart Images
Figure CN223274206U_ABST
Abstract
Description
Technical Field
[0001] The utility model discloses a Bluetooth headset, in particular to a head-mounted Bluetooth headset supporting a bass-enhanced speaker, belonging to the technical field of consumer electronic products. Background Art
[0002] Bluetooth headphones (also called wireless headphones) connect to devices via Bluetooth technology and transmit audio signals wirelessly. Compared to traditional wired headphones, Bluetooth headphones eliminate the constraints of cables and provide greater freedom, making them suitable for sports, commuting, and everyday use. Compared to in-ear Bluetooth headphones, Bluetooth headphones generally offer better sound quality, greater comfort, and enhanced noise cancellation.
[0003] Because the earmuffs of Bluetooth headsets cover the entire ear, they are usually more comfortable to wear than in-ear headphones and are less likely to cause discomfort during long-term use. In addition, since Bluetooth headsets use larger earmuffs, they usually provide richer bass and clearer sound quality. However, Bluetooth headsets in the existing technology all use a single-sided speaker design, that is, the treble, mid-range and bass are played through the same speaker. The sound quality often depends on the quality of the speaker. However, even if a high-quality speaker wants to have excellent performance across the entire frequency band, the result is often unsatisfactory. Summary of the Invention
[0004] In response to the above-mentioned shortcomings of the existing technology of Bluetooth headsets that use a single-sided single speaker design and have poor sound quality, the utility model provides a Bluetooth headset that supports a bass enhancement speaker. It plays audio through two systems of ordinary speakers and subwoofers, which can achieve better bass effects.
[0005] The technical solution adopted by the utility model to solve its technical problems is: a head-mounted Bluetooth headset that supports a bass enhancement speaker, the Bluetooth headset includes a Bluetooth module, a microphone interface, a first audio power amplifier module, a first speaker, a low-pass filter module, a second audio power amplifier module, a second speaker and a power module, the microphone interface is connected to the audio input interface of the Bluetooth module, the first audio power amplifier module is connected to the audio output interface of the Bluetooth module, the first speaker is connected to the audio output end of the first audio power amplifier module, the low-pass filter module is connected to the audio output interface of the Bluetooth module, the second audio power amplifier module is connected to the output end of the low-pass filter module, the second speaker is connected to the audio output end of the second audio power amplifier module, and the power module is used for power supply.
[0006] The technical solution adopted by the utility model to solve the technical problem further includes:
[0007] The TRX interface of the Bluetooth module is connected to a Bluetooth antenna, and the RST# interface of the Bluetooth module is connected to a reset module. The reset module includes a capacitor C36, a resistor R64, a resistor R65, a resistor R63 and a transistor Q11. The base of the transistor Q11 is connected to the positive power supply through the resistor R64 and the capacitor C36 connected in series, the base of the transistor Q11 is grounded through the resistor R65, the collector of the transistor Q11 is connected to the positive power supply through the resistor R63, the emitter of the transistor Q11 is connected to the RST# interface of the Bluetooth module, and the SCI interface and the SCO interface of the Bluetooth module are connected to a clock module.
[0008] The first audio power amplifier module adopts the audio power amplifier chip U5, the INL- interface of the audio power amplifier chip U5 is connected to the L- interface of the Bluetooth module, the INL+ interface of the audio power amplifier chip U5 is connected to the L+ interface of the Bluetooth module, the INR- interface of the audio power amplifier chip U5 is connected to the R- interface of the Bluetooth module, the INR+ interface of the audio power amplifier chip U5 is connected to the R+ interface of the Bluetooth module, the OUTL interface of the audio power amplifier chip U5 is connected to the left speaker in the first speaker, the OUTR interface of the audio power amplifier chip U5 is connected to the right speaker in the first speaker, and the enable end SHDN# interface of the audio power amplifier chip U5 is connected to the general I / O port of the Bluetooth module.
[0009] The low-pass filter module adopts a dual operational amplifier U4, the inverting input terminal of the first amplifier of the dual operational amplifier U4 is connected to the audio output interface of the first audio power amplifier module, the non-inverting input terminal of the first amplifier of the dual operational amplifier U4 is connected to the positive power supply, the output terminal of the first amplifier of the dual operational amplifier U4 is connected to the non-inverting input terminal of the second amplifier of the dual operational amplifier U4, the output terminal of the second amplifier of the dual operational amplifier U4 is connected to the input terminal of the second audio power amplifier module, a capacitor C56 is connected between the output terminal of the second amplifier of the dual operational amplifier U4 and the ground, and a capacitor C55 and a resistor R29 are also connected in series between the output terminal of the second amplifier of the dual operational amplifier U4 and the ground.
[0010] The second audio power amplifier module adopts an audio power amplifier chip U3, the INL- interface of the audio power amplifier chip U3 is connected to the OUT2 interface of the low-pass filter module, the INL+ interface of the audio power amplifier chip U3 is grounded, the INR- interface of the audio power amplifier chip U3 is connected to the OUT2 interface of the low-pass filter module, the INR+ interface of the audio power amplifier chip U3 is grounded, the OUTL interface of the audio power amplifier chip U3 is connected to the left speaker in the second speaker, the OUTR interface of the audio power amplifier chip U3 is connected to the right speaker in the second speaker, and the enable end SHDN# interface of the audio power amplifier chip U3 is connected to the general I / O port of the Bluetooth module.
[0011] The universal I / O port of the Bluetooth module is connected to a bass power control module, which includes a transistor Q5, a field-effect transistor Q6 and a switch SW5. The base of the transistor Q5 is connected to the universal I / O port of the Bluetooth module through a current-limiting resistor R70, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is connected to the gate of the field-effect transistor Q6, the source of the field-effect transistor Q6 is connected to the positive power supply, and the drain of the field-effect transistor Q6 is connected to one end of the switch SW5 through a Schottky diode D1. The other end of the switch SW5 is connected to the power supply end of the second audio power amplifier module and the non-inverting input end of the first amplifier of the dual operational amplifier U4.
[0012] The microphone interface includes a built-in microphone interface and an external microphone interface J3. A built-in microphone is welded on the built-in microphone interface. The built-in microphone interface is connected to the MIC0_P interface of the Bluetooth module through the external microphone interface J3. The microphone audio input interface of the external microphone interface J3 is connected to the MIC0_P interface of the Bluetooth module, and the microphone detection interface of the external microphone interface J3 is connected to the general I / O port of the Bluetooth module.
[0013] The power module includes a power input interface, a charging management module, a lithium battery and an overvoltage and overcurrent protection module. The power input interface adopts a TYPE-C interface J1. The power interface of the TYPE-C interface J1 is connected to the power input interface of the overvoltage and overcurrent protection module. The power output interface of the overvoltage and overcurrent protection module is connected to the charging management module, and the power output interface of the charging management module is connected to the lithium battery.
[0014] The Bluetooth headset also includes a line input interface J2, which is connected to the input end of the first audio power amplifier module and the low-pass filter module. The audio signal input by the line input interface J2 is played through the first speaker and the second speaker. The audio input end of the line input interface J2 is connected to the MIC0_P interface of the Bluetooth module through the external microphone interface J3. The detection end of the line input interface J2 is connected to the line input power control module, which includes a transistor Q10, a field effect tube Q 9 and field effect transistor Q7, the gate of the field effect transistor Q7 is connected to the detection end of the line input interface J2, the source of the field effect transistor Q7 is connected to the positive power supply of the lithium battery, the drain of the field effect transistor Q7 is connected to the power supply end of the first audio power amplifier module, the base of the transistor Q10 is connected to the detection end of the line input interface J2, the emitter of the transistor Q10 is grounded, the collector of the transistor Q10 is connected to the gate of the field effect transistor Q9, the source of the field effect transistor Q9 is connected to the positive power supply of the lithium battery, and the drain of the field effect transistor Q7 is connected to the switch SW5.
[0015] The Bluetooth module is connected to a key module, which includes a key SW4, a key SW2 and a key SW3. One end of the key SW4 is connected to the positive power supply SVCC, and the other end is connected to the IO interface of the Bluetooth module; one end of the key SW2 is grounded, and the other end is connected to the universal I / O port of the Bluetooth module through a voltage divider resistor R71. One end of the key SW3 is grounded, and the other end is connected to the universal I / O port GPIO0 of the Bluetooth module through a voltage divider resistor R72. The positive power supply VCC is connected to the universal I / O port GPIO0 of the Bluetooth module through a voltage divider resistor R73. The resistance values of the voltage divider resistors R71 and R72 are different. The Bluetooth module is connected to an indicator light module to indicate The light module includes a power-on indicator light and a working indicator light. The power-on indicator light includes a left power-on indicator light and a right power-on indicator light. The left power-on indicator light and the right power-on indicator light are respectively connected to the positive power supply of the lithium battery. The working indicator light includes a left working indicator light, a right working indicator light and a field effect transistor Q2. The left working indicator light and the right working indicator light are both connected to the source of the field effect transistor, the drain of the field effect transistor is grounded, and the gate of the field effect transistor is connected to the universal I / O port of the Bluetooth module. The Bluetooth module is connected to an atmosphere light, which includes a red LED, a blue LED and a green LED. The red LED, the blue LED and the green LED are respectively connected to a universal I / O port of the Bluetooth module through a current limiting resistor.
[0016] The beneficial effects of the present invention are: in addition to the full-band speaker, the present invention also adds a bass enhancement vibration speaker to enhance the bass effect of the Bluetooth headset. The present invention also provides a low-pass filter in the circuit to obtain the low-frequency audio signal, and then drives the bass enhancement speaker to sound through the audio power amplifier.
[0017] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a circuit block diagram of the utility model.
[0019] Figure 2 This is a partial circuit schematic of the Bluetooth module in this utility model.
[0020] Figure 3 This is a partial circuit schematic diagram of the reset module in this utility model.
[0021] Figure 4 This is a partial circuit schematic diagram of the clock module in this utility model.
[0022] Figure 5 This is the circuit principle diagram of the battery interface part in this utility model.
[0023] Figure 6 This is a partial circuit schematic diagram of the first audio power amplifier module in the present utility model.
[0024] Figure 7 This is a partial circuit schematic diagram of the second audio power amplifier module in the present invention.
[0025] Figure 8 This is a partial circuit schematic diagram of the first speaker module in the present invention.
[0026] Figure 9 This is a partial circuit schematic diagram of the second speaker module in the present invention.
[0027] Figure 10 This is a partial circuit schematic diagram of the key module in this utility model.
[0028] Figure 11 This is a partial circuit schematic diagram of the low-pass filter module of this utility model.
[0029] Figure 12 This is a partial circuit diagram of the indicator light module in this utility model.
[0030] Figure 13 This is a partial circuit diagram of the indicator light power supply switch module in this utility model.
[0031] Figure 14 This is a partial circuit schematic of the power supply module of the mid-audio power amplifier of this utility model.
[0032] Figure 15 This is the circuit principle diagram of the line input interface in this utility model.
[0033] Figure 16 This is the circuit principle diagram of the microphone interface part in this utility model.
[0034] Figure 17 This is the circuit schematic diagram of the TYPE-C interface in this utility model.
[0035] Figure 18 This is the partial circuit schematic diagram of the new medium overvoltage protection module used in this machine.
[0036] Figure 19 This is a partial circuit schematic diagram of the charging management module in this utility model.
[0037] Figure 20 This is a partial circuit schematic diagram of the debugging module in this utility model. DETAILED DESCRIPTION
[0038] This embodiment is a preferred implementation of the present utility model. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the present utility model.
[0039] Please refer to the attached Figure 1 To the attached Figure 20 The present invention protects a Bluetooth headset that supports bass-enhanced speakers. The headset mainly includes a Bluetooth module, a microphone interface, a first audio amplifier module, a first speaker, a low-pass filter module, a second audio amplifier module, a second speaker, and a power module. The microphone interface is connected to the audio input interface of the Bluetooth module, the first audio amplifier module is connected to the audio output interface of the Bluetooth module, the first speaker is connected to the audio output end of the first audio amplifier module, the low-pass filter module is connected to the audio output interface of the Bluetooth module, the second audio amplifier module is connected to the output end of the low-pass filter module, and the second speaker is connected to the audio output end of the second audio amplifier module. The power module is used for power supply. The first speaker adopts a full-band speaker, and the first audio amplifier module drives the first speaker to output full-band audio. The second speaker adopts a bass-enhanced vibration speaker. The low-pass filter module filters out the high-frequency part of the audio signal and retains the low-frequency part. The second audio amplifier module amplifies the low-frequency part and drives the second speaker to output low-frequency sound. The bass is output through a separate bass-enhanced vibration speaker, so that the bass effect of the entire output audio is better.
[0040] In this embodiment, the Bluetooth module uses a Bluetooth low-energy chip U1 (Bluetooth LowEnergy, BLE) model CM2025, which has its own data processing function (i.e., MCU). In specific implementation, a Bluetooth chip of model or other series can also be used. A Bluetooth antenna is connected to the TRX interface of the Bluetooth low-energy chip U1.
[0041] In this embodiment, a reset module is connected to the RST# interface of the Bluetooth module. The reset module includes a capacitor C36, resistors R64, R65, R63, and a transistor Q11. The base of the transistor Q11 is connected to the positive power supply (DC5V) via the series connection of resistor R64 and capacitor C36. The base of the transistor Q11 is grounded via resistor R65. The collector of the transistor Q11 is connected to the positive power supply (SVCC) via resistor R63. The emitter of the transistor Q11 is connected to the RST# interface of the Bluetooth module.
[0042] In this embodiment, the SCI interface and the SCO interface of the Bluetooth module are connected to a clock module, and the clock module adopts a 32 MHz quartz crystal oscillator Y1.
[0043] In this embodiment, the first audio power amplifier module adopts an audio power amplifier chip U5 with model LPA4722AQVF. The INL- interface of the audio power amplifier chip U5 is connected to the L- interface of the Bluetooth module, the INL+ interface of the audio power amplifier chip U5 is connected to the L+ interface of the Bluetooth module, the INR- interface of the audio power amplifier chip U5 is connected to the R- interface of the Bluetooth module, the INR+ interface of the audio power amplifier chip U5 is connected to the R+ interface of the Bluetooth module, the OUTL interface of the audio power amplifier chip U5 is connected to the left speaker in the first speaker, the OUTR interface of the audio power amplifier chip U5 is connected to the right speaker in the first speaker, and the enable end SHDN# interface of the audio power amplifier chip U5 is connected to the general I / O port GPIO8 of the Bluetooth module.
[0044] In this embodiment, the low-pass filter module adopts a dual operational amplifier U4, and the dual operational amplifier U4 adopts an operational amplifier model MS6022. The inverting input terminal of the first amplifier of the dual operational amplifier U4 is connected to the audio output interface of the first audio power amplifier module, the non-inverting input terminal of the first amplifier of the dual operational amplifier U4 is connected to the positive power supply, the output terminal of the first amplifier of the dual operational amplifier U4 is connected to the non-inverting input terminal of the second amplifier of the dual operational amplifier U4, the output terminal of the second amplifier of the dual operational amplifier U4 is connected to the input terminal of the second audio power amplifier module, a capacitor C56 is connected between the output terminal of the second amplifier of the dual operational amplifier U4 and the ground, and a capacitor C55 and a resistor R29 are also connected in series between the output terminal of the second amplifier of the dual operational amplifier U4 and the ground. The high-frequency part of the audio signal output by the second amplifier of the dual operational amplifier U4 can be filtered out by the capacitor C56 and the capacitor C55, and the low-frequency part is retained to be output to the second audio power amplifier module.
[0045] In this embodiment, the second audio power amplifier module adopts an audio power amplifier chip U3 with model LPA4722AQVF. The INL- interface of the audio power amplifier chip U3 is connected to the OUT2 interface of the low-pass filter module, the INL+ interface of the audio power amplifier chip U3 is grounded, the INR- interface of the audio power amplifier chip U3 is connected to the OUT2 interface of the low-pass filter module, the INR+ interface of the audio power amplifier chip U3 is grounded, the OUTL interface of the audio power amplifier chip U3 is connected to the left speaker in the second speaker, the OUTR interface of the audio power amplifier chip U3 is connected to the right speaker in the second speaker, and the enable end SHDN# interface of the audio power amplifier chip U3 is connected to the general I / O port GPIO7 of the Bluetooth module.
[0046] In this embodiment, a bass power control module is connected to the general I / O port of the Bluetooth module. The bass power control module includes a transistor Q5, a field-effect transistor Q6 and a switch SW5. The base of the transistor Q5 is connected to the general I / O port GPIO17 of the Bluetooth module through a current-limiting resistor R70, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is connected to the gate of the field-effect transistor Q6, the source of the field-effect transistor Q6 is connected to the positive power supply, and the drain of the field-effect transistor Q6 is connected to one end of the switch SW5 through a Schottky diode D1. The other end of the switch SW5 is connected to the power supply end of the second audio power amplifier module and the non-inverting input end of the first amplifier of the dual operational amplifier U4. Whether the power supply of the second audio power amplifier module is turned on is controlled by the switch SW5, that is, whether the bass playback is started is controlled by the switch SW5.
[0047] In this embodiment, the microphone interface includes a built-in microphone interface and an external microphone interface J3. A built-in microphone is welded on the built-in microphone interface. The built-in microphone interface is connected to the MIC0_P interface of the Bluetooth module through the external microphone interface J3. The microphone audio input interface of the external microphone interface J3 is connected to the MIC0_P interface of the Bluetooth module. The microphone detection interface of the external microphone interface J3 is connected to the general I / O port GPIO9 of the Bluetooth module. When it detects that the external microphone on the external microphone interface J3 is unplugged, it automatically switches to the built-in microphone.
[0048] In this embodiment, the power module includes a power input interface, a charging management module, a lithium battery, and an overvoltage and overcurrent protection module. The power input interface uses a TYPE-C interface J1. The power interface of the TYPE-C interface J1 is connected to the power input interface of the overvoltage and overcurrent protection module. The power output interface of the overvoltage and overcurrent protection module is connected to the charging management module. The power output interface of the charging management module is connected to the lithium battery. The lithium battery is charged through the power input interface, the charging management module, and the overvoltage and overcurrent protection module, and the lithium battery is used to power the present invention. In this embodiment, the overvoltage and overcurrent protection module uses an overvoltage and overcurrent protection chip U2 with a model number of LP5038B6F, and the charging management module uses a lithium battery charging chip U6 with a model number of ME4069. In specific implementation, the charging management module and the overvoltage and overcurrent protection module can also be replaced by chips of other models.
[0049] In this embodiment, a line input interface J2 is also included, which is connected to the input ends of the first audio amplifier module and the low-pass filter module. The audio signal input by the line input interface J2 is played through the first speaker and the second speaker. The audio input end of the line input interface J2 is connected to the MIC0_P interface of the Bluetooth module through the external microphone interface J3. In this embodiment, a line input power control module is connected to the detection end of the line input interface J2. The line input power control module includes a transistor Q10, a field effect transistor Q9, and a field effect transistor Q7. The gate of the field effect transistor Q7 is connected to the detection end of the line input interface J2, the source of the field effect transistor Q7 is connected to the positive power supply of the lithium battery, the drain of the field effect transistor Q7 is connected to the power supply end of the first audio power amplifier module, the base of the transistor Q10 is connected to the detection end of the line input interface J2, the emitter of the transistor Q10 is grounded, the collector of the transistor Q10 is connected to the gate of the field effect transistor Q9, the source of the field effect transistor Q9 is connected to the positive power supply of the lithium battery, and the drain of the field effect transistor Q7 is connected to the switch SW5. When a connector is inserted into the line input interface J2, the first audio power amplifier module can be triggered to play the audio signal input by the line input interface J2.
[0050] In this embodiment, a button module is connected to the Bluetooth module, which includes a button SW4, a button SW2, and a button SW3. One end of the button SW4 is connected to the positive power supply SVCC and the other end is connected to the WIO0 interface of the Bluetooth module for power on / off operation. One end of the button SW2 is grounded and the other end is connected to the general I / O port GPIO0 of the Bluetooth module via a voltage divider resistor R71. One end of the button SW3 is grounded and the other end is connected to the general I / O port GPIO0 of the Bluetooth module via a voltage divider resistor R72. The positive power supply VCC is connected to the general I / O port GPIO0 of the Bluetooth module via a voltage divider resistor R73. The resistance values of the voltage divider resistors R71 and R72 are different. When the button SW2 or the button SW3 is turned on, the voltage value detected by the general I / O port GPIO0 of the Bluetooth module is different, thereby determining which button is turned on. Among them, the button SW2 is used to increase the volume (VOL+), and the button SW3 is used to decrease the volume (VOL-).
[0051] In this embodiment, an indicator light module is connected to the Bluetooth module, and the indicator light module includes a power-on indicator light and a working indicator light. The power-on indicator light includes a left power-on indicator light and a right power-on indicator light. The left power-on indicator light and the right power-on indicator light are respectively connected to the positive power supply of the lithium battery. When the lithium battery is powered, the left power-on indicator light and the right power-on indicator light are on. The working indicator light includes a left working indicator light, a right working indicator light and a field effect transistor Q2. The left working indicator light and the right working indicator light are both connected to the source of the field effect transistor, the drain of the field effect transistor is grounded, and the gate of the field effect transistor is connected to the general I / O port of the Bluetooth module. The left working indicator light and the right working indicator light are controlled by the Bluetooth module to provide working indications.
[0052] In this embodiment, an atmosphere light is connected to the Bluetooth module, and the atmosphere light includes a red LED, a blue LED and a green LED. The red LED, the blue LED and the green LED are respectively connected to a universal I / O port of the Bluetooth module through a current-limiting resistor, and the red LED, the blue LED and the green LED are directly driven to emit light through the Bluetooth module.
[0053] In this embodiment, the Bluetooth module is connected to a test interface for testing its performance.
[0054] In addition to the full-band speaker, the present invention also adds a bass enhancement vibration speaker to enhance the bass effect of the Bluetooth headset. The present invention also provides a low-pass filter in the circuit to obtain the low-frequency audio signal, and then drives the bass enhancement speaker to sound through the audio power amplifier.
Claims
1. A Bluetooth headset supporting a bass-boosted speaker, characterized by: The Bluetooth headset includes a Bluetooth module, a microphone interface, a first audio power amplifier module, a first speaker, a low-pass filter module, a second audio power amplifier module, a second speaker and a power module. The microphone interface is connected to the audio input interface of the Bluetooth module, the first audio power amplifier module is connected to the audio output interface of the Bluetooth module, the first speaker is connected to the audio output end of the first audio power amplifier module, the low-pass filter module is connected to the audio output interface of the Bluetooth module, the second audio power amplifier module is connected to the output end of the low-pass filter module, the second speaker is connected to the audio output end of the second audio power amplifier module, and the power module is used for power supply.
2. The Bluetooth headset supporting bass-boosted speakers according to claim 1, characterized in that: The TRX interface of the Bluetooth module is connected to a Bluetooth antenna, and the RST# interface of the Bluetooth module is connected to a reset module. The reset module includes a capacitor C36, a resistor R64, a resistor R65, a resistor R63 and a transistor Q11. The base of the transistor Q11 is connected to the positive power supply through the resistor R64 and the capacitor C36 connected in series, the base of the transistor Q11 is grounded through the resistor R65, the collector of the transistor Q11 is connected to the positive power supply through the resistor R63, the emitter of the transistor Q11 is connected to the RST# interface of the Bluetooth module, and the SCI interface and the SCO interface of the Bluetooth module are connected to a clock module.
3. The Bluetooth headset supporting bass-boosted speakers according to claim 1, characterized in that: The first audio power amplifier module adopts the audio power amplifier chip U5, the INL- interface of the audio power amplifier chip U5 is connected to the L- interface of the Bluetooth module, the INL+ interface of the audio power amplifier chip U5 is connected to the L+ interface of the Bluetooth module, the INR- interface of the audio power amplifier chip U5 is connected to the R- interface of the Bluetooth module, the INR+ interface of the audio power amplifier chip U5 is connected to the R+ interface of the Bluetooth module, the OUTL interface of the audio power amplifier chip U5 is connected to the left speaker in the first speaker, the OUTR interface of the audio power amplifier chip U5 is connected to the right speaker in the first speaker, and the enable end SHDN# interface of the audio power amplifier chip U5 is connected to the general I / O port of the Bluetooth module.
4. The Bluetooth headset supporting bass-boosted speakers according to claim 1, characterized in that: The low-pass filter module adopts a dual operational amplifier U4, the inverting input terminal of the first amplifier of the dual operational amplifier U4 is connected to the audio output interface of the first audio power amplifier module, the non-inverting input terminal of the first amplifier of the dual operational amplifier U4 is connected to the positive power supply, the output terminal of the first amplifier of the dual operational amplifier U4 is connected to the non-inverting input terminal of the second amplifier of the dual operational amplifier U4, the output terminal of the second amplifier of the dual operational amplifier U4 is connected to the input terminal of the second audio power amplifier module, a capacitor C56 is connected between the output terminal of the second amplifier of the dual operational amplifier U4 and the ground, and a capacitor C55 and a resistor R29 are also connected in series between the output terminal of the second amplifier of the dual operational amplifier U4 and the ground.
5. The Bluetooth headset supporting bass-boosted speakers according to claim 1, characterized in that: The second audio power amplifier module adopts an audio power amplifier chip U3, the INL- interface of the audio power amplifier chip U3 is connected to the OUT2 interface of the low-pass filter module, the INL+ interface of the audio power amplifier chip U3 is grounded, the INR- interface of the audio power amplifier chip U3 is connected to the OUT2 interface of the low-pass filter module, the INR+ interface of the audio power amplifier chip U3 is grounded, the OUTL interface of the audio power amplifier chip U3 is connected to the left speaker in the second speaker, the OUTR interface of the audio power amplifier chip U3 is connected to the right speaker in the second speaker, and the enable end SHDN# interface of the audio power amplifier chip U3 is connected to the general I / O port of the Bluetooth module.
6. The Bluetooth headset supporting bass-boosted speakers according to claim 4, characterized in that: The universal I / O port of the Bluetooth module is connected to a bass power control module, which includes a transistor Q5, a field-effect transistor Q6 and a switch SW5. The base of the transistor Q5 is connected to the universal I / O port of the Bluetooth module through a current-limiting resistor R70, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is connected to the gate of the field-effect transistor Q6, the source of the field-effect transistor Q6 is connected to the positive power supply, and the drain of the field-effect transistor Q6 is connected to one end of the switch SW5 through a Schottky diode D1. The other end of the switch SW5 is connected to the power supply end of the second audio power amplifier module and the non-inverting input end of the first amplifier of the dual operational amplifier U4.
7. The Bluetooth headset supporting a bass-boosted speaker according to claim 1, characterized in that: The microphone interface includes a built-in microphone interface and an external microphone interface J3. A built-in microphone is welded on the built-in microphone interface. The built-in microphone interface is connected to the MIC0_P interface of the Bluetooth module through the external microphone interface J3. The microphone audio input interface of the external microphone interface J3 is connected to the MIC0_P interface of the Bluetooth module, and the microphone detection interface of the external microphone interface J3 is connected to the general I / O port of the Bluetooth module.
8. The Bluetooth headset supporting bass-boosted speakers according to claim 1, characterized in that: The power module includes a power input interface, a charging management module, a lithium battery and an overvoltage and overcurrent protection module. The power input interface adopts a TYPE-C interface J1. The power interface of the TYPE-C interface J1 is connected to the power input interface of the overvoltage and overcurrent protection module. The power output interface of the overvoltage and overcurrent protection module is connected to the charging management module, and the power output interface of the charging management module is connected to the lithium battery.
9. The Bluetooth headset supporting bass-boosted speakers according to claim 1, characterized in that: The Bluetooth headset also includes a line input interface J2, which is connected to the input end of the first audio power amplifier module and the low-pass filter module. The audio signal input by the line input interface J2 is played through the first speaker and the second speaker. The audio input end of the line input interface J2 is connected to the MIC0_P interface of the Bluetooth module through the external microphone interface J3. The detection end of the line input interface J2 is connected to the line input power control module, which includes a transistor Q10, a field effect tube Q 9 and field effect transistor Q7, the gate of the field effect transistor Q7 is connected to the detection end of the line input interface J2, the source of the field effect transistor Q7 is connected to the positive power supply of the lithium battery, the drain of the field effect transistor Q7 is connected to the power supply end of the first audio power amplifier module, the base of the transistor Q10 is connected to the detection end of the line input interface J2, the emitter of the transistor Q10 is grounded, the collector of the transistor Q10 is connected to the gate of the field effect transistor Q9, the source of the field effect transistor Q9 is connected to the positive power supply of the lithium battery, and the drain of the field effect transistor Q7 is connected to the switch SW5.
10. The Bluetooth headset supporting bass-boosted speakers according to claim 1, characterized in that: The Bluetooth module is connected to a key module, which includes a key SW4, a key SW2 and a key SW3. One end of the key SW4 is connected to the positive power supply SVCC, and the other end is connected to the IO interface of the Bluetooth module; one end of the key SW2 is grounded, and the other end is connected to the universal I / O port of the Bluetooth module through a voltage divider resistor R71. One end of the key SW3 is grounded, and the other end is connected to the universal I / O port GPIO0 of the Bluetooth module through a voltage divider resistor R72. The positive power supply VCC is connected to the universal I / O port GPIO0 of the Bluetooth module through a voltage divider resistor R73. The resistance values of the voltage divider resistors R71 and R72 are different. The Bluetooth module is connected to an indicator light module to indicate The light module includes a power-on indicator light and a working indicator light. The power-on indicator light includes a left power-on indicator light and a right power-on indicator light. The left power-on indicator light and the right power-on indicator light are respectively connected to the positive power supply of the lithium battery. The working indicator light includes a left working indicator light, a right working indicator light and a field effect transistor Q2. The left working indicator light and the right working indicator light are both connected to the source of the field effect transistor, the drain of the field effect transistor is grounded, and the gate of the field effect transistor is connected to the universal I / O port of the Bluetooth module. The Bluetooth module is connected to an atmosphere light, which includes a red LED, a blue LED and a green LED. The red LED, the blue LED and the green LED are respectively connected to a universal I / O port of the Bluetooth module through a current limiting resistor.