Bluetooth circuit with voice interaction function

Abstract

This utility model discloses a Bluetooth circuit with voice interaction function, belonging to the field of artificial intelligence. It includes: a main control module, comprising a Bluetooth chip U2, a crystal oscillator Y1, an antenna matching inductor L1, and an antenna matching capacitor C1. The crystal oscillator Y1 is connected to the Bluetooth chip U2, and the antenna matching inductor L1 and antenna matching capacitor C1 are connected in parallel to the Bluetooth chip U2; a speaker module for receiving and playing voice information fed back from the main control module to the user; and a microphone module for recognizing the user's voice information. Both the microphone module and the speaker module are connected to the Bluetooth chip. Compared with existing technologies, this application integrates the microphone and speaker module into the Bluetooth chip, enabling the Bluetooth chip to act as a bridge to connect with smart products, mini-programs, and apps with AI interaction functions, thereby realizing the AI-enabled nature of electronic devices and facilitating AI voice interaction between users and electronic devices.

Description

Technical Field

[0001] This utility model belongs to the field of artificial intelligence, and specifically relates to a Bluetooth circuit with voice interaction function. Background Technology

[0002] Currently, electronic devices such as desk lamps, speakers, and watches can connect to smart products like mobile phones and tablets via Bluetooth, allowing users to control these devices. With the development of artificial intelligence, the demand for voice interaction with electronic devices is increasing. Therefore, how to combine Bluetooth with voice interaction, acting as a bridge to connect with smart products, mini-programs, and apps that have AI interactive capabilities, to realize the AI-enabled nature of electronic devices and facilitate AI voice interaction between users and these devices, is a problem that existing technologies need to solve. Utility Model Content

[0003] To address the aforementioned issues, the purpose of this invention is to provide a Bluetooth circuit with voice interaction capabilities, equipped with a microphone and speaker module. This circuit serves as a bridge to connect with smart products, mini-programs, and apps that have AI interaction capabilities, thereby enabling the AI ​​integration of electronic devices and facilitating AI voice interaction between users and electronic devices.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] This utility model provides a Bluetooth circuit with voice interaction function, including:

[0006] The main control module includes a Bluetooth chip U2, a crystal oscillator Y1, an antenna matching inductor L1, and an antenna matching capacitor C1. The crystal oscillator Y1 is connected to the Bluetooth chip U2, and the antenna matching inductor L1 and the antenna matching capacitor C1 are connected in parallel to the Bluetooth chip U2.

[0007] The speaker module is used to receive and play back voice information from the main control module to the user;

[0008] The MIC module is used to recognize the user's voice information;

[0009] Both the MIC module and the speaker module are connected to the Bluetooth chip.

[0010] Furthermore, the main control module also includes filter capacitors C3, C5, C6, and C9, which are connected in parallel and respectively connected to different pins of the Bluetooth chip U2.

[0011] Furthermore, the main control module also includes a filter capacitor C8, with its two ends connected to different pins of the Bluetooth chip U2.

[0012] Furthermore, the main control module also includes indicator LED1 and resistor R4, which are connected in series to Bluetooth chip U2.

[0013] Furthermore, the speaker module includes an audio power amplifier chip U1 and a speaker J4. The audio power amplifier chip U1 is connected to the Bluetooth chip U2, and the speaker J4 is connected to the audio power amplifier chip U1. The speaker J4 is connected to the VOP pin of the audio power amplifier chip U1 for playing the amplified audio signal.

[0014] Furthermore, the speaker module also includes resistors R2 and R3, and a filter capacitor C2. The audio power amplifier chip U1 is connected to the VBAT pin of the Bluetooth chip U2 through resistors R2 and R3. One end of the filter capacitor C2 is grounded, and the other end is connected to the audio power amplifier chip U1.

[0015] Furthermore, the speaker module also includes a capacitor C7 and a resistor R5, which are connected in series. One end of the capacitor C7 and the resistor R5 is connected to the DACK pin of the Bluetooth chip U2, and the other end is connected to the audio power amplifier chip U1.

[0016] Furthermore, the speaker module also includes a resistor R1, one end of which is connected to the MUTE of the Bluetooth chip U2, and the other end is connected in parallel with the resistor R2 to the audio power amplifier chip U1.

[0017] Furthermore, the speaker module also includes a filter capacitor C4, one end of which is connected to the audio power amplifier chip U1, and the other end is grounded.

[0018] Furthermore, the MIC module includes M1 and capacitor C10, with the two ends of the capacitor connected to the two ends of M1 respectively, and M1 and capacitor C10 connected to Bluetooth chip U2.

[0019] Furthermore, the Bluetooth circuit also includes interfaces J1, J2, and J3, all of which are connected to the Bluetooth chip U2.

[0020] Compared with the prior art, the beneficial effects of this utility model are: by integrating the microphone and speaker module into the Bluetooth chip, the Bluetooth chip can act as a bridge to connect with smart products, mini-programs and APPs with AI interaction functions, thereby realizing the AI-ification of electronic devices and facilitating AI voice interaction between users and electronic devices. Attached Figure Description

[0021] Figure 1 This is a block diagram of the Bluetooth circuit of this application.

[0022] Figure 2 This is the circuit schematic of the main control module.

[0023] Figure 3 This is the circuit diagram of the speaker module.

[0024] Figure 4 This is the circuit schematic of the MIC module.

[0025] Figure 5 This is the circuit schematic diagram of interface J1, interface J2, and interface J3. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] To achieve the above objectives, the technical solution of this utility model is as follows:

[0028] See Figures 1-2 As shown, this embodiment provides a Bluetooth circuit with voice interaction function, including:

[0029] The main control module includes a Bluetooth chip U2, a crystal oscillator Y1, an antenna matching inductor L1, and an antenna matching capacitor C1. The crystal oscillator Y1 is connected to the Bluetooth chip U2, and the antenna matching inductor L1 and the antenna matching capacitor C1 are connected in parallel to the Bluetooth chip U2.

[0030] The speaker module is used to receive and play back voice information from the main control module to the user;

[0031] The MIC module is used to recognize the user's voice information;

[0032] Both the MIC module and the speaker module are connected to the Bluetooth chip.

[0033] Further, see Figure 2 The main control module also includes filter capacitors C3, C5, C6, and C9, which are connected in parallel and respectively connected to different pins of the Bluetooth chip U2.

[0034] Furthermore, the main control module also includes a filter capacitor C8, with its two ends connected to different pins of the Bluetooth chip U2.

[0035] Furthermore, the main control module also includes indicator LED1 and resistor R4, which are connected in series to Bluetooth chip U2.

[0036] In this application, the principle of the main control module is as follows:

[0037] 1. Chip section: The Bluetooth chip U2 is model AC6965A_Q SOP24, which has multiple pins, each with a specific function, used to connect external circuit components to realize various functions.

[0038] 2. Power supply related:

[0039] Power supply pins:

[0040] BT_VDD: Powers the Bluetooth module.

[0041] VDDIO: Provides power to the chip's input / output interface circuits.

[0042] AVDD: Analog power supply pin, which provides power to the analog circuitry within the chip.

[0043] VBAT: Typically connected to a battery power source to provide power to the chip.

[0044] Filter capacitors: C3, C5, C6, and C9 are connected to their respective power supply pins to filter out noise and interference in the power supply, ensuring its stability and purity, and enabling the chip to operate stably.

[0045] 3. Crystal oscillator section:

[0046] Y1 (24MHz crystal oscillator): Marked with an internal parasitic capacitance of 12pF and a frequency offset within ±10PPM. Its pin 1 (BT_OSCO) and pin 3 (BT_OSCI) are connected to pins 23 and 24 of the chip, respectively. The crystal oscillator provides a stable clock signal to the chip, and the internal logic circuitry uses this clock signal to coordinate the operation of various parts, ensuring the accurate timing of the entire system.

[0047] 4. Antenna and matching circuit:

[0048] Antenna: The antenna symbol on the right side of the circuit is used to transmit and receive Bluetooth wireless signals.

[0049] Matching circuit: Composed of inductor L1 and capacitor C1, it enables the antenna's input impedance to match the chip's output impedance, maximizing signal transmission efficiency, reducing signal reflection, and enhancing the transmission and reception of Bluetooth signals.

[0050] 5. Communication interface section:

[0051] USB interfaces: USB-DM and USB-DP are used to enable USB data transfer and power supply between the chip and external smart devices with AI capabilities (such as computers, mobile phones, etc.).

[0052] Serial port: TXD and RXD are used for serial communication between the chip and other devices to send and receive data.

[0053] 6. Audio-related:

[0054] MIC pin: Microphone interface pin, used to connect a microphone, collect external sound signals and input them into the chip for processing.

[0055] Audio output pins: The DACL and DAR pins are digital-to-analog converter audio output pins, used to convert the digital audio signal processed by the chip into an analog audio signal for output. The C8 capacitor acts as a filter to improve the audio output quality.

[0056] Further, see Figure 3 The speaker module includes an audio power amplifier chip U1 and a speaker J4. The audio power amplifier chip U1 is connected to a Bluetooth chip U2, and the speaker J4 is connected to the audio power amplifier chip U1. The speaker J4 is connected to the VOP pin of the audio power amplifier chip U1 for playing amplified audio signals.

[0057] Furthermore, the audio power amplifier chip U1 is model LTK5128D, manufactured by Shenzhen Lianhuike Electronic Technology Co., Ltd., and uses an SOP9 package. The chip has multiple pin functions marked on it: the SD pin is used to control the chip's shutdown; the BYP pin is used for grounding; the IN pin is used for audio input; the VDD pin is the chip's power supply pin; and the VOP and VON pins are the audio power amplifier output pins, connected to the speaker SPK.

[0058] Furthermore, the speaker module also includes resistors R2 and R3, and a filter capacitor C2. The audio power amplifier chip U1 is connected to the VBAT pin of the Bluetooth chip U2 through resistors R2 and R3. One end of the filter capacitor C2 is grounded, and the other end is connected to the audio power amplifier chip U1. In this application, VBAT provides power input to the circuit and is connected to the chip pin through resistors R2 and R3. Meanwhile, capacitor C2 acts as a filter to ensure power stability.

[0059] Furthermore, the speaker module also includes capacitor C7 and resistor R5, which are connected in series. One end of capacitor C7 is connected to the DACK pin of Bluetooth chip U2, and the other end is connected to audio power amplifier chip U1. DACK serves as the left channel audio signal input pin after digital-to-analog conversion, and is connected to the IN pin of the chip through capacitor C7 and resistor R5. C7 acts as a DC-blocking and AC-passing audio signal.

[0060] Furthermore, the speaker module also includes a resistor R1. One end of resistor R1 is connected to the MUTE pin of the Bluetooth chip U2, and the other end is connected in parallel with resistor R2 to the audio power amplifier chip U1. MUTE serves as a mute control pin, connected to the chip's SD pin via resistor R1. A high level mutes the amplifier, while a low level plays audio normally.

[0061] Furthermore, the speaker module also includes a filter capacitor C4, one end of which is connected to the audio power amplifier chip U1, and the other end is grounded.

[0062] Further, see Figure 4 The MIC module includes M1 and capacitor C10. The two ends of the capacitor are respectively connected to the two ends of M1, and M1 and capacitor C10 are connected to Bluetooth chip U2.

[0063] Further, see Figure 5 The Bluetooth circuit also includes interfaces J1, J2, and J3, all of which are connected to the Bluetooth chip U2.

[0064] In this application, interface J1 is a 4-pin connector used for code upgrades and programming. Pin 1 is connected to GND to provide a reference potential for the entire circuit and ensure stable operation. Pin 2 is connected to USBDP and pin 3 is connected to USBDM. The two form a USB data transmission line to transmit differential signals in USB communication and realize data interaction between devices. Pin 4 is connected to VBAT, which usually represents battery power or external power input to provide the power required for the circuit to work.

[0065] Interface J2 is a reserved programming interface (CON4) for unforeseen circumstances. Pin 1 is connected to GND to provide a reference potential for the circuit and ensure stable operation. Pin 2 is connected to RXD, the receive data pin, used to receive data in serial communication. Pin 3 is connected to TXD, the transmit data pin, used to transmit data in serial communication. Pin 4 is connected to VBAT, generally representing battery power or external power input, to power the circuit.

[0066] Interface J3 is a 2-pin connector for external power supply. Pin 2 is connected to VBAT, which represents battery power or external power input, providing electrical energy to the circuit. Pin 1 is connected to GND, i.e., ground, providing a reference potential for the circuit to ensure normal operation.

[0067] Compared with the prior art, the beneficial effects of this utility model are: by integrating the microphone and speaker module into the Bluetooth chip, the Bluetooth chip can act as a bridge to connect with smart products, mini-programs and APPs with AI interaction functions, thereby realizing the AI-ification of electronic devices and facilitating AI voice interaction between users and electronic devices.

[0068] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A Bluetooth circuit having a voice interaction function, characterized by comprising: include: The main control module includes a Bluetooth chip U2, a crystal oscillator Y1, an antenna matching inductor L1, and an antenna matching capacitor C1. The crystal oscillator Y1 is connected to the Bluetooth chip U2, and the antenna matching inductor L1 and the antenna matching capacitor C1 are connected in parallel to the Bluetooth chip U2. The speaker module is used to receive and play back voice information from the main control module to the user; The MIC module is used to recognize the user's voice information; Both the MIC module and the speaker module are connected to the Bluetooth chip. The speaker module includes an audio power amplifier chip U1 and a speaker J4. The audio power amplifier chip U1 is connected to the Bluetooth chip U2, and the speaker J4 is connected to the audio power amplifier chip U1. The speaker module also includes resistors R2 and R3, and a filter capacitor C2. The audio power amplifier chip U1 is connected to the VBAT pin of the Bluetooth chip U2 through resistors R2 and R3. One end of the filter capacitor C2 is grounded, and the other end is connected to the audio power amplifier chip U1.

2. The Bluetooth circuit with voice interaction function according to claim 1, characterized in that, The main control module also includes filter capacitors C3, C5, C6, and C9, which are connected in parallel and respectively connected to different pins of the Bluetooth chip U2.

3. The Bluetooth circuit with voice interaction function according to claim 1, wherein, The main control module also includes a filter capacitor C8, the two ends of which are respectively connected to different pins of the Bluetooth chip U2.

4. The Bluetooth circuit with voice interaction function according to claim 1, characterized in that, The main control module also includes indicator LED1 and resistor R4, which are connected in series to Bluetooth chip U2.

5. The Bluetooth circuit with voice interaction function according to claim 1, wherein, The speaker module also includes a capacitor C7 and a resistor R5, which are connected in series. One end of the capacitor C7 and the resistor R5 is connected to the DACK pin of the Bluetooth chip U2, and the other end is connected to the audio power amplifier chip U1.

6. The Bluetooth circuit with voice interaction function according to claim 5, wherein, The speaker module also includes a resistor R1, one end of which is connected to the MUTE of the Bluetooth chip U2, and the other end is connected in parallel with the resistor R2 to the audio power amplifier chip U1.

7. The Bluetooth circuit with voice interactive function as claimed in claim 6, characterized in that, The speaker module also includes a filter capacitor C4, one end of which is connected to the audio power amplifier chip U1, and the other end is grounded.

8. The Bluetooth circuit with voice interaction function according to claim 1, wherein, The MIC module includes M1 and capacitor C10. The two ends of the capacitor are connected to the two ends of M1 respectively, and M1 and capacitor C10 are connected to Bluetooth chip U2.

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