Audio Bluetooth control circuit based on voice control

Abstract

The invention discloses an audio Bluetooth control circuit based on voice control, and belongs to the field of Bluetooth control circuits, the circuit is mainly composed of a lithium battery and a Bluetooth chip, the Bluetooth chip is connected to the lithium battery through a filter capacitor C4 for power supply, and a plurality of functional modules are arranged in the Bluetooth chip: a power supply module ensures stable operation of the chip; the power key detection module realizes the startup and shutdown functions through a PWRKEY pin, and can be started or shut down after being pressed for 2 seconds; the FM function module supports FM broadcast receiving; the Bluetooth antenna module is responsible for receiving signals in a frequency range of 2.4-2.5 G to realize Bluetooth connection, in addition, the circuit also comprises a fantasy lamp bead power supply and control module, a charging and lithium protection module, a LINE IN input module, a key module, a microphone (MIC) module, a TF card seat module, a power amplifier module and the like, and the circuit is rich in function, convenient to operate and high in practicability. And high-quality audio Bluetooth control experience is provided for the user.

Description

Technical Field

[0001] The present invention relates to the field of Bluetooth control circuits, and more specifically, to an audio Bluetooth control circuit based on voice control. Background Art

[0002] With the continuous development of science and technology, audio Bluetooth devices play an increasingly important role in people's daily lives. Traditional audio Bluetooth devices are mainly operated through physical buttons. Although this method is simple and direct, it has certain limitations in user experience. In order to improve user experience, audio Bluetooth devices based on voice control have gradually emerged in recent years. This type of device can recognize the user's voice commands through the built-in voice recognition module, thereby realizing the control of the device, greatly improving the convenience and intelligence of operation.

[0003] Most of the audio Bluetooth products on the market can only be connected to the mobile phone and then manually play songs on the mobile phone music platform, and there is no way to free your hands to perform playback operations. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide an audio Bluetooth control circuit based on voice control. The present invention adopts a voice chip in combination with the existing Bluetooth so that the user only needs to connect the mobile phone Bluetooth to directly wake up the voice assistant of the mobile phone to complete all the functions of the user without manual operation, which gives the traditional ordinary speakers smart, convenient and flexible colors, and brings users a better user experience.

[0006] 2. Technical solution

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] An audio Bluetooth control circuit based on voice control, comprising:

[0009] include:

[0010] Lithium battery, used to provide power supply voltage, the voltage range is 3.2V to 4.2V;

[0011] The Bluetooth chip AB5605C, whose power supply end is connected to the lithium battery, has the following functional modules:

[0012] The power supply module is connected to the lithium battery through the filter capacitor (C4) to power the chip;

[0013] The power button detection module, where the power button is connected to the PWRKEY pin (pin 13) of the chip, is used to turn the machine on and off by pressing it for 2 seconds;

[0014] The crystal oscillator module includes a 26MHz crystal oscillator (Y1), which is connected to the chip's BT_OSCI (pin 16) and BT_OSCO (pin 12) to provide a reference clock.

[0015] Voltage regulator module, the chip contains two voltage regulators, which output 3.3V voltage at VDDDAC (pin 1) and VDDIO (pin 7);

[0016] Bluetooth antenna module, the Bluetooth antenna is connected to the BT_ANT (pin 14) of the chip, which is used to receive and send signals in the 2.4G-2.5G frequency range;

[0017] FM function module, the FM_ANT (pin 3) of the chip is used to connect the radio antenna;

[0018] Key detection module, multiple keys are connected to the PWRKEY pin (pin 13) of the chip through resistors of different resistance values, and function identification is achieved through voltage division;

[0019] The 4th pin of the chip outputs data in the magic light control module to control the lighting and color change of the magic light beads;

[0020] The colorful lamp bead power supply circuit includes:

[0021] Control signal output, the 17th pin of the chip outputs a high level, which drives the transistor (Q1) through the resistor (R22);

[0022] MOS tube control, the triode controls the MOS tube (Q2) to conduct, and supplies power to the colorful lamp beads;

[0023] Filter capacitor, filtering the output voltage to the colorful lamp beads through capacitor (C2);

[0024] 5050 colorful lamp bead components receive control data to achieve lighting effects;

[0025] Charging and lithium battery protection module, including:

[0026] Charging management chip (U3), the 5V voltage of the external adapter is input through the USB interface, and the chip is responsible for the charging management of the lithium battery and the charging status indication;

[0027] Lithium protection IC (U4), when the cell voltage is lower than 2.6V, cut off the power supply to protect the battery;

[0028] Bluetooth status indicator (D1), connected to pin 18 of the chip, displays the device status;

[0029] LINE IN input interface, including:

[0030] Audio signal input, the external audio signal is input through the socket (J2), and connected to the 23rd pin of the chip through the coupling capacitor (C12) and the resistor (R9);

[0031] Mode switch detection, when the LINE IN line is inserted, the 21st pin of the chip is pulled low and switches to LINE IN mode;

[0032] Microphone module (MIC1), including:

[0033] Power supply circuit, the first pin of the chip outputs 3V voltage, which powers the microphone through the resistor (R31);

[0034] Signal input, the microphone signal is input to the 22nd pin of the chip through the coupling capacitor (C26);

[0035] TF card interface module, including:

[0036] Power supply circuit, the 7th pin of the chip outputs 3.3V voltage, which is used to power the TF card holder after filtering;

[0037] Detection and data transmission, the chip's 20th pin detects the insertion of the card and reads the TF card data;

[0038] Power amplifier module, including:

[0039] Amplifier IC (U2), receives battery voltage for power supply;

[0040] Enable control, the 6th pin of the chip outputs a high level to enable the power amplifier IC;

[0041] Audio signal input, the 24th pin of the chip outputs the audio signal, which is connected to the power amplifier IC through the circuit;

[0042] Audio output, the power amplifier IC amplifies the signal and drives the speaker (SPK) to output sound;

[0043] Wireless microphone receiving module, including:

[0044] The receiving chip (U5) is powered by the output voltage of pin 7 of the chip;

[0045] Antenna and crystal oscillator, the receiving antenna is connected to the receiving chip, and the external crystal oscillator (Y2) provides the reference clock;

[0046] Audio signal transmission: the audio signal received by the receiving chip is transmitted to pin 22 of the chip;

[0047] Voice IC module, including:

[0048] The boost chip (U7) boosts the battery voltage to 5V to power the voice IC (U6);

[0049] Voice IC (U6) receives audio signals, communicates with the chip, and wakes up the voice assistant on the mobile phone.

[0050] As a further improvement of the present invention, a 90K resistor is internally connected to the PWRKEY pin of the Bluetooth chip to VDDRTC 2.4V, and each key is connected in series with a resistor of different resistance value. When the key is pressed, function recognition is achieved through voltage division.

[0051] As a further improvement of the present invention, in the magic lamp bead power supply circuit, the 17th pin of the chip outputs a high level, drives the transistor (Q1) through a resistor (R22), and after the transistor is turned on, the MOS tube (Q2) is turned on. After the MOS tube is turned on, the voltage output through the filter capacitor (C2) is used to power the magic lamp bead.

[0052] As a further improvement of the present invention, the charging management chip (U3) is CL4054, and the 5V voltage of the external adapter is input through the USB interface. When charging, the CHRG pin outputs a low level, so that the indicator light (D2) lights up. When fully charged, the CHRG pin outputs a high level and the indicator light goes out.

[0053] As a further improvement of the present invention, the lithium battery protection IC (U4) is RB312A, which cuts off the power supply when the battery cell voltage is lower than about 2.6V to prevent over-discharge.

[0054] As a further improvement of the present invention, the receiving chip (U5) of the wireless microphone receiving module uses a 24MHz crystal oscillator (Y2) to provide a reference clock, the receiving antenna is connected to the 9th pin of the receiving chip, and the received audio signal is input to the 22nd pin of the chip through a capacitor (C13) and a resistor (R13).

[0055] As a further improvement of the present invention, the boost chip (U7) is HX4004A, the battery voltage is filtered and then supplied with power, the high level output of the chip's pin 17 is connected to the enable pin (pin 3) of the boost chip through a resistor (R10), and the boost chip outputs a 5V voltage after operation to supply power to the voice IC (U6).

[0056] As a further improvement of the present invention, the voice IC (U6) receives the audio signal transmitted by the chip or the wireless microphone receiving module, and wakes up and controls the voice assistant on the mobile phone through communication with the chip.

[0057] As a further improvement of the present invention, the power amplifier IC (U2) is ZY9826. When the chip detects that an audio signal is input, its 6th pin outputs a high level, which is transmitted to the enable pin (4th pin) of the power amplifier IC through a resistor (R6), so that the power amplifier IC works.

[0058] As a further improvement of the present invention, in the TF card interface module, the 7th pin (VDDIO) of the chip outputs a 3.3V voltage, which is filtered by a resistor (R8) and a capacitor (C11) to supply power to the TF card holder (TF1). When the TF card is inserted, the CD pin of the card holder is connected to GND, and the 20th pin of the chip detects a low level, entering the TF card mode.

[0059] 3. Beneficial effects

[0060] (1) This solution uses an efficient charging management chip and a lithium battery protection IC to achieve intelligent charging and over-discharge protection for lithium batteries, effectively extending the battery life and endurance. At the same time, the voltage stabilization module in the circuit ensures stable power supply to the chip and various functional modules, improving the reliability and stability of the circuit.

[0061] (2) The present invention realizes flexible control of lighting effects through the magic light control module and the magic light bead power supply circuit. Users can change the color and brightness of the light through voice commands or key operations, which increases the fun and personalization of the device.

[0062] (3) The present invention uses a high-performance Bluetooth chip and power amplifier module to achieve accurate processing and amplification of audio signals. At the same time, through the LINE IN input interface and microphone module, the present invention supports multiple audio input methods to meet the user's usage needs in different scenarios. In addition, the addition of a wireless microphone receiving module and a voice IC module enables the device to receive and process audio signals from a wireless microphone, as well as wake up and control the voice assistant on the mobile phone, further improving the intelligence level of the device.

[0063] (4) The present invention supports the insertion and reading of TF cards through the TF card interface module, and users can store music files in the TF card and play them through the device. This design not only increases the storage capacity of the device, but also provides users with more music choices.

[0064] (5) The present invention realizes convenient control of device power on / off and function operation through the power button detection module and the key detection module. At the same time, the addition of the Bluetooth status indicator light and the colorful light beads enables the user to intuitively understand the status and working status of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a circuit principle block diagram of the present invention;

[0066] Figure 2 This is a schematic diagram of the overall connection of the Bluetooth chip AB5605C of the present invention;

[0067] Figure 3 This is a partial connection diagram of the 5050 colorful lamp beads of the present invention;

[0068] Figure 4 This is a schematic diagram of the connection of the power supply part of the magic lamp beads of the present invention;

[0069] Figure 5 This is a schematic diagram of the connection of the charging and lithium battery protection parts of the present invention;

[0070] Figure 6 This is a connection diagram of the LINE IN input part of the present invention;

[0071] Figure 7 This is a schematic diagram of the Bluetooth status light connection of the present invention;

[0072] Figure 8 This is a connection diagram of the microphone part (receiving end) of the present invention;

[0073] Fig. 9 This is a connection diagram of the key part (receiving end) of the present invention;

[0074] Fig.10 This is a partial connection diagram of the TF card holder of the present invention;

[0075] Fig.11 This is a schematic diagram of the connection of the power amplifier part of the present invention;

[0076] Fig.12 This is a schematic diagram of the connection of the power supply part of the voice IC of the present invention;

[0077] Fig.13 This is a connection diagram of the wireless microphone receiving part of the present invention;

[0078] Fig.14 This is a schematic diagram of the connection of the voice IC part of the present invention;

[0079] Fig.15 A schematic diagram of the connection of the transmitting part of the wireless microphone of the present invention;

[0080] Fig.16 This is a connection diagram of the microphone part (transmitter end) of the present invention;

[0081] Fig.17 This is a schematic diagram of the connection of the charging part of the present invention;

[0082] Fig.18 It is a connection diagram of the key part (transmitter) of the present invention. DETAILED DESCRIPTION

[0083] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0084] See also Figure 1-18 , an audio Bluetooth control circuit based on voice control, comprising:

[0085] 1. Power supply part:

[0086] Lithium battery power supply: The circuit is powered by a 3.2V-4.2V lithium battery. The positive electrode of the battery is connected to the VBAT pin (pin 8) of the Bluetooth chip AB5605C (i.e. U1) through a filter capacitor C4 (capacity of 1μF). The negative electrode of the battery is grounded (GND).

[0087] Filtering and voltage regulation: After the battery voltage is filtered by C4, it provides a stable voltage to power U1. U1 integrates two voltage regulators, which output 3.3V voltage at U1's 1st pin (VDDDAC) and 7th pin (VDDIO). These two 3.3V voltages are used to power other modules.

[0088] 2. Bluetooth chip AB5605C part (U1):

[0089] Crystal connection: The two ends of the 26MHz crystal oscillator Y1 are connected to pin 16 (BT_OSCI) and pin 12 (BT_OSCO) of U1 respectively to provide a reference clock signal.

[0090] Bluetooth antenna: Pin 14 (BT_ANT) of U1 is connected to the antenna through an inductor, which is used to receive and send 2.4GHz to 2.5GHz wireless signals.

[0091] Power button detection: The POWER button is connected to pin 13 (PWRKEY) of U1, and there is a 90K pull-up resistor to 2.4V (VDDRTC) inside. When the POWER button is pressed, the PWRKEY pin is pulled down to below 0.3V for 2 seconds, and the chip starts working and boots up.

[0092] Key interface: In addition to the POWER key, there are MODE, NEXT / V+, PREV / V-, and LED keys, which are connected to the PWRKEY pin (pin 13 of U1) through resistors of different resistance values ​​(R23, R24, R26, R27, and R28). Pressing different keys will generate different voltage divisions on the PWRKEY pin, and U1 will perform corresponding functions based on the detected voltage values.

[0093] 3. Magic color lamp bead control part:

[0094] Power supply control: U1's 17-pin outputs a high level, driving transistor Q1 (S8050) through resistor R22 (1K) to turn it on. Q1's collector is connected to the gate of MOS tube Q2, which is a SI2301 N-channel MOS tube. Q2's source is grounded, and its drain is connected to the power supply. After filtering through C2 (10μF), it supplies power to the 5050 colorful lamp beads (RGB1 to RGB5).

[0095] Data control: U1's 4-pin (PE7 / AUXR2 / ADC9 / IR) is connected to the DIN pin of the colorful lamp bead, and control data is sent serially to control the on and off and color change of the colorful lamp bead.

[0096] 4. Charging and lithium battery protection part:

[0097] Charging management chip (U3): Using the CL4054 charging management chip (U3), the external 5V power supply is input through the VCC pin of the USB interface (USB1), and is provided to the VCC pin of U3 through the current limiting resistor R1 (2.2K) and filter capacitors C8 and C9 (both 1μF). The BAT (pin 3) of U3 is connected to the positive electrode of the battery, and the GND (pin 2) is grounded. When charging, the CHRG (pin 1) of U3 outputs a low level and lights up the charging indicator D2; when fully charged, the CHRG pin outputs a high level and D2 goes out.

[0098] Lithium battery protection chip (U4): Use RB312A as lithium battery protection IC. The positive pole of the battery is connected to the B-pin (3 pin) of U4, and the negative pole of the battery is grounded. U4 monitors the battery voltage. When the voltage is lower than 2.6V, it cuts off the power supply to prevent over-discharge.

[0099] 5.Bluetooth status indicator:

[0100] Indicator light control: U1's 18th foot (PB4 / ADC6 / USB_DM) is connected to the LED indicator light D1, and the brightness is adjusted through the current limiting resistor R30 (560Ω). When U1's 18th foot outputs a high level, D1 lights up; when it outputs a low level, D1 turns off.

[0101] 6.LINE IN input part:

[0102] Audio input interface: The external audio signal is input through pin 2 (L) and pin 3 (R) of the headphone jack J2, and is connected to pin 23 (PF2 / IR / ADC10 / MICL) of U1 through coupling capacitor C12 (1μF) and resistor R9 (4.7K) to realize the input of audio signal.

[0103] Automatic switching function: When the LINE IN line is inserted, the 4th pin (V) and the 5th pin (GND) of J2 are turned on, and the 21st pin (PA5 / SDCMD1 / ADC0 / IR) of U1 is pulled low. When U1 detects that the 21st pin is at a low level, it automatically switches to the LINE IN mode.

[0104] 7. Microphone (MIC) part:

[0105] Power supply: Pin 1 (VDDDAC) of U1 outputs 3.3V voltage, which is used to power microphone MIC1 through resistor R31 (6.8K).

[0106] Signal input: The output signal of microphone MIC1 is connected to pin 22 (PF0 / AUXL3 / ADC11 / IR) of U1 through coupling capacitor C26 (100nF) to realize the input of voice signal.

[0107] 8.TF card interface part:

[0108] Power supply: The LDO regulator inside U1 outputs 3.3V voltage at pin 7 (VDDIO), which is used to supply power to the TF card holder TF1 through resistor R8 (4.7Ω) and filter capacitor C11 (100nF).

[0109] Detection and data transmission: When a TF card is inserted, the CD pin (pin 9) and VSS pin (pin 6) of TF1 are turned on, and the 20th pin of U1 (PA6 / SDCLK1 / ADC1 / IR) is pulled low. When U1 detects that the 20th pin is at a low level, it enters the TF card mode. Data transmission is connected to the DAT0, CLK, CMD and other pins of the TF card through the 19th, 20th, and 21st pins of U1 (PA7 / SDDAT1 / ADC2, PA6 / SDCLK1 / ADC1, and PA5 / SDCMD1 / ADC0, respectively) to realize data reading and music playback.

[0110] 9. Power amplifier part:

[0111] Amplifier chip (U2): Use ZY9826 amplifier IC. The battery voltage is supplied to PVBAT (pin 1) and AVBAT (pin 5) of U2 through filter capacitors C5 (1μF) and C15 (10μF). The GND pin (pin 6) of U2 is grounded.

[0112] Enable control: When U1 detects an audio signal, U1's pin 6 (PE0 / MUTE / IR) outputs a high level and is connected to U2's CTRL pin (pin 4) through resistor R6 (27K) to enable the power amplifier.

[0113] Audio signal input: U1's 24-pin (PE6 / AUXL2 / ADC8 / IR) outputs the audio signal, which is connected to U2's INN (pin 7) and INP (pin 6) pins through coupling capacitor C28 (68nF) and resistor R5 (27K) and input to the power amplifier.

[0114] Audio signal output: The audio signal is amplified by U2 and output from the OUTP (pin 8) and OUTN (pin 9) pins, and connected to the speaker SPK to achieve sound playback.

[0115] 10. Wireless microphone receiving part:

[0116] Receiver chip (U5): AB5666C3 chip is used. Pin 7 (VDDIO) of U1 outputs 3.3V voltage, which passes through current limiting resistor R14 (2.2Ω) and filter capacitor C14 (10μF) to power U5.

[0117] Crystal oscillator and antenna: 24MHz crystal oscillator Y2 is connected to XIN (pin 6) and XOUT (pin 7) of U5 to provide clock. Pin 9 (BT_ANT) of U5 is connected to the receiving antenna through inductor L5 (10pF).

[0118] Audio signal transmission: When U5 receives the audio signal from the wireless microphone, it is output from pin 19 (MICNL) of U5, passes through coupling capacitor C13 (100nF) and resistor R13 (1K), and is connected to pin 22 (PF0 / AUXL3 / ADC11 / IR) of U1 to realize wireless audio input.

[0119] Communication with the main chip: Pin 17 (ADC2 / PA4) and pin 20 (PA1 / HV) of U5 are connected to pin 5 (ADC5 / USB_DP / PB3) and pin 11 (PB1 / AUXL1 / ADC3 / IR) of U1 respectively, and communication is carried out through UART and other means to realize function control.

[0120] 11. Voice IC part (CI1302):

[0121] Power supply boost: Use HX4004A boost chip (U7) to boost the battery voltage to 5V to power the voice IC CI1302 (U6). U7's VIN (pin 5) is connected to the battery voltage, and the EN (pin 3) enable pin is connected to U1's pin 17. When U1's pin 17 outputs a high level, U7 is enabled.

[0122] Voice IC power supply: The 5V voltage boosted by U7 is output from VOUT (pin 1) of U7, passes through current limiting resistor R17 (4.7Ω) and filter capacitor C20 (4.7μF), and supplies power to pin 2 (VIN5V) of U6.

[0123] Audio signal input and communication: Pin 16 (AIN2) of U6 receives the audio signal from U1 or U5. When U6 detects the audio signal, it communicates with pin 12 (AGND) of U1 through pin 14 (PA4 / PG_EN). At the same time, U6 can connect to the mobile phone via Bluetooth to wake up the voice assistant on the mobile phone.

[0124] The connections between the above functional modules are as follows:

[0125] Power supply system: All modules are powered by lithium batteries, which provide appropriate voltage for each module through different voltage stabilization and boost chips.

[0126] Control core: U1 (AB5605C) is the core control chip, responsible for Bluetooth connection, button control, audio processing, LED control and other functions.

[0127] Audio processing: After the audio signal is processed by U1, it is output to the power amplifier U2 to drive the speaker to play. At the same time, U1 can receive external audio input (LINE IN, wireless microphone, MIC).

[0128] Communication and interaction: U1 works with U5 (wireless microphone receiving chip) and U6 (voice IC) through the communication interface to achieve functional expansion, such as voice assistant wake-up.

[0129] Working principle:

[0130] The lithium battery is used as the power source of the entire circuit, providing a voltage range of 3.2V to 4.2V. After the voltage of the lithium battery is filtered by the filter capacitor (C4), it provides a stable power supply for the Bluetooth chip AB5605C. The power supply end of the Bluetooth chip AB5605C is connected to the lithium battery and receives a stable power supply voltage through the filter capacitor C4. When the power button (POWER button) is pressed for 2 seconds, if the PWRKEY pin detects a voltage below 0.3V for 2 seconds, the Bluetooth chip starts to work and turns on. The Bluetooth chip contains two voltage regulator ICs. After turning on, Pin 1 and pin 7 will output 3.3V voltage respectively. Pin 3 of the chip is used for FM function, and pin 14 is used as the Bluetooth antenna pin to receive the transmission signal in the frequency range of 2.4G-2.5G. After powering on, the chip sends data through pin 4 to light up the colorful lamp beads. The charging management is controlled by the U3 charging management chip through the external adapter 5V voltage input through USB, and the charging status is displayed through the D2 indicator light. The lithium protection IC (U4) ensures that the battery voltage is not less than 2.6V to protect the power supply. After the Bluetooth chip is turned on, pin 1 outputs 3V voltage to power the microphone MIC1. After MIC1 detects external sound, it is coupled to pin 22 of the chip through C26. After the battery voltage is boosted to 5V by the boost chip U7, it powers the voice IC CI1302. When pin 21 of U7 receives an audio signal from the Bluetooth chip or the wireless microphone receiving part, the voice IC will connect to the mobile phone through the Bluetooth chip and wake up the voice assistant on the mobile phone. Pin 7 of the Bluetooth chip outputs 3.3V voltage to power the wireless microphone receiving chip U5. After receiving the signal transmitted by the wireless microphone, U5 outputs the audio signal to the 22nd pin of the Bluetooth chip through a specific pin to realize the transmission and control of the audio signal. The external audio signal can be input through the LINE IN interface. When the LINE IN line is detected, the Bluetooth chip will enter the LINE IN mode. It also supports the insertion of a TF card. When a TF card is detected, the Bluetooth chip will enter the TF card mode and play the music in the TF card. When the Bluetooth chip determines that there is an audio signal input, it will control the power amplifier IC (U2) to work, amplify the audio signal and output it to the speaker (SPK).

[0131] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An audio Bluetooth control circuit based on voice control, characterized in that: include: Lithium battery, used to provide power supply voltage, the voltage range is 3.2V to 4.2V; The Bluetooth chip AB5605C, whose power supply end is connected to the lithium battery, has the following functional modules: The power supply module is connected to the lithium battery through the filter capacitor (C4) to power the chip; The power button detection module, where the power button is connected to the PWRKEY pin (pin 13) of the chip, is used to turn the machine on and off by pressing it for 2 seconds; The crystal oscillator module includes a 26MHz crystal oscillator (Y1), which is connected to the chip's BT_OSCI (pin 16) and BT_OSCO (pin 12) to provide a reference clock. Voltage regulator module, the chip contains two voltage regulators, which output 3.3V voltage at VDDDAC (pin 1) and VDDIO (pin 7); Bluetooth antenna module, the Bluetooth antenna is connected to the BT_ANT (pin 14) of the chip, which is used to receive and send signals in the 2.4G-2.5G frequency range; FM function module, the FM_ANT (pin 3) of the chip is used to connect the radio antenna; Key detection module, multiple keys are connected to the PWRKEY pin (pin 13) of the chip through resistors of different resistance values, and function identification is achieved through voltage division; The 4th pin of the chip outputs data in the magic light control module to control the lighting and color change of the magic light beads; The colorful lamp bead power supply circuit includes: Control signal output, the 17th pin of the chip outputs a high level, which drives the transistor (Q1) through the resistor (R22); MOS tube control, the triode controls the MOS tube (Q2) to conduct, and supplies power to the colorful lamp beads; Filter capacitor, filtering the output voltage to the colorful lamp beads through capacitor (C2); 5050 colorful lamp bead components receive control data to achieve lighting effects; Charging and lithium battery protection module, including: Charging management chip (U3), the 5V voltage of the external adapter is input through the USB interface, and the chip is responsible for the charging management of the lithium battery and the charging status indication; Lithium protection IC (U4), when the cell voltage is lower than 2.6V, cut off the power supply to protect the battery; Bluetooth status indicator (D1), connected to pin 18 of the chip, displays the device status; LINE IN input interface, including: Audio signal input, the external audio signal is input through the socket (J2), and connected to the 23rd pin of the chip through the coupling capacitor (C12) and the resistor (R9); Mode switch detection, when the LINE IN line is inserted, the 21st pin of the chip is pulled low and switches to LINE IN mode; Microphone module (MIC1), including: Power supply circuit, the first pin of the chip outputs 3V voltage, which powers the microphone through the resistor (R31); Signal input, the microphone signal is input to the 22nd pin of the chip through the coupling capacitor (C26); TF card interface module, including: Power supply circuit, the 7th pin of the chip outputs 3.3V voltage, which is used to power the TF card holder after filtering; Detection and data transmission, the chip's 20th pin detects the insertion of the card and reads the TF card data; Power amplifier module, including: Amplifier IC (U2), receives battery voltage for power supply; Enable control, the 6th pin of the chip outputs a high level to enable the power amplifier IC; Audio signal input, the 24th pin of the chip outputs the audio signal, which is connected to the power amplifier IC through the circuit; Audio output, the power amplifier IC amplifies the signal and drives the speaker (SPK) to output sound; Wireless microphone receiving module, including: The receiving chip (U5) is powered by the output voltage of pin 7 of the chip; Antenna and crystal oscillator, the receiving antenna is connected to the receiving chip, and the external crystal oscillator (Y2) provides the reference clock; Audio signal transmission: the audio signal received by the receiving chip is transmitted to pin 22 of the chip; Voice IC module, including: The boost chip (U7) boosts the battery voltage to 5V to power the voice IC (U6); Voice IC (U6) receives audio signals, communicates with the chip, and wakes up the voice assistant on the mobile phone.

2. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: The PWRKEY pin of the Bluetooth chip is internally connected to a 90K resistor to VDDRTC 2.4V, and each button is connected in series with a resistor of different resistance value. When the button is pressed, function recognition is achieved through voltage division.

3. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: In the magic lamp bead power supply circuit, the 17th pin of the chip outputs a high level, which drives the transistor (Q1) through a resistor (R22). After the transistor is turned on, the MOS tube (Q2) is turned on. After the MOS tube is turned on, the voltage output through the filter capacitor (C2) is used to power the magic lamp bead.

4. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: The charging management chip (U3) is CL4054, and the 5V voltage of the external adapter is input through the USB interface. When charging, the CHRG pin outputs a low level, so that the indicator light (D2) lights up. When fully charged, the CHRG pin outputs a high level, and the indicator light goes out.

5. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: The lithium battery protection IC (U4) is RB312A, which cuts off the power supply to prevent over-discharge when the battery cell voltage is lower than about 2.6V.

6. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: The receiving chip (U5) of the wireless microphone receiving module uses a 24MHz crystal oscillator (Y2) to provide a reference clock, the receiving antenna is connected to the 9th pin of the receiving chip, and the received audio signal is input to the 22nd pin of the chip through a capacitor (C13) and a resistor (R13).

7. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: The boost chip (U7) is HX4004A, and the battery voltage is filtered before powering. The high level output of the chip's pin 17 is connected to the enable pin (pin 3) of the boost chip through a resistor (R10). After the boost chip works, it outputs a 5V voltage to power the voice IC (U6).

8. The audio Bluetooth control circuit based on voice control according to claim 3, characterized in that: The voice IC (U6) receives the audio signal transmitted by the chip or the wireless microphone receiving module, and wakes up and controls the voice assistant on the mobile phone through communication with the chip.

9. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: The power amplifier IC (U2) is ZY9826. When the chip detects that an audio signal is input, its 6th pin outputs a high level, which is transmitted to the enable pin (4th pin) of the power amplifier IC through a resistor (R6), so that the power amplifier IC works.

10. The audio Bluetooth control circuit based on voice control according to claim 1, characterized in that: In the TF card interface module, the 7th pin (VDDIO) of the chip outputs a 3.3V voltage, which is filtered by a resistor (R8) and a capacitor (C11) to supply power to the TF card holder (TF1). When a TF card is inserted, the CD pin of the card holder is connected to GND, and the 20th pin of the chip detects a low level, entering the TF card mode.

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