A wireless audio transmission device supporting eARC to Bluetooth audio output

Abstract

The utility model relates to a wireless audio transmission device supporting eARC conversion Bluetooth audio output, and it relates to the field of audio signal processing and wireless transmission, especially relates to a wireless audio transmission device for converting television audio signal into Bluetooth earphone output through eARC or ARC interface, it includes casing, HDMI interface, antenna interface, is provided with circuit board in casing, and the surface of casing is provided with a plurality of buttons, and the HDMI interface and antenna interface are arranged at both ends of casing respectively, and the circuit of circuit board includes main control unit, eARC / ARC receiving module, digital audio conversion chip, Bluetooth sending chip, antenna signal transmitting end, power module, key interface, LED display interface, it can convert the received HDMI audio signal into I2S digital signal and then send to earphone terminal through Bluetooth module, and solve the problem that traditional household television audio output mode does not support Bluetooth.

Description

Technical Field

[0001] This utility model relates to the field of audio signal processing and wireless transmission technology, and in particular to a wireless audio transmission device for converting television audio signals into Bluetooth headset output via an eARC or ARC interface. Background Technology

[0002] With the increasing popularity of home audio-visual equipment and the growing demand for personalized listening experiences, wireless audio receiving devices such as Bluetooth headphones have become widely used in home settings. Modern televisions are generally equipped with HDMI interfaces and support ARC (Audio Return Channel) or eARC (enhanced Audio Return Channel) protocols for outputting audio signals from the TV to external audio devices. However, most TVs do not have built-in Bluetooth audio output functionality, especially in scenarios requiring wireless audio transmission from the TV to Bluetooth headphones; users often need to purchase third-party audio adapters.

[0003] Some existing Bluetooth audio adapters primarily rely on analog audio (such as a 3.5mm headphone jack) or optical audio (SPDIF) for audio acquisition, but they suffer from the following technical limitations: First, they cannot support high-quality audio channels such as HDMI eARC / ARC, resulting in limited compatibility; second, the audio format is fixed, making it impossible to achieve intelligent matching between different audio formats (such as 7.1CH, 5.1CH, or 2.0CH); third, some products have significant shortcomings in terms of user interface, Bluetooth pairing management, and ease of use, lacking features such as connection memory and visual selection.

[0004] Especially with the increasing popularity of the eARC protocol, how to efficiently acquire audio from the TV's eARC / ARC interface and convert it into a wireless audio signal that can be received by Bluetooth headphones has become an important issue in home wireless audio transmission technology. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a wireless audio transmission device that supports eARC to Bluetooth audio output. This device can convert received HDMI audio signals into I2S digital signals and then wirelessly transmit them to headphone terminals via a Bluetooth module, thus solving the problem that traditional home TV audio output methods do not support Bluetooth.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: it includes a housing A1, an HDMI interface A2, and an antenna interface A3. A circuit board A4 is disposed inside the housing A1, and several buttons A5 are disposed on the surface of the housing A1. The HDMI interface A2 and the antenna interface A3 are respectively disposed at both ends of the housing A1. The circuit of the circuit board A4 includes a main control unit 1, an eARC / ARC receiving module 2, a digital audio conversion chip 3, a Bluetooth transmitting chip 4, an antenna signal transmitting end 5, a power module 6, a button interface 7, and an LED display interface 8; the signal receiving end of the eARC / ARC receiving module 2... The control terminal of the eARC / ARC receiver module 2 is connected to the main control unit 1, and the signal output terminal of the eARC / ARC receiver module 2 is connected to the signal input terminal of the digital audio converter chip 3. The audio signal output terminal of the digital audio converter chip 3 is connected to the antenna signal transmitter 5 through the Bluetooth transmitter chip 4. The control terminals of the digital audio converter chip 3 and the Bluetooth transmitter chip 4 are connected to the main control unit 1. The power module 6 provides +1.8V and +3.3V DC power to the entire circuit. The display output terminal of the main control unit 1 is connected to the LED display interface 8, and the control terminal of the main control unit 1 is connected to the button interface 7.

[0007] The eARC / ARC receiver module 2 is connected to the TV via an eARC / ARC interface. The eARC / ARC receiver module 2 is based on the EP9511 chip and supports EDID setting and audio reception.

[0008] The digital audio conversion chip 3 is an audio format conversion chip 8416, which is used to convert the S / PDIF signal output by the eARC / ARC receiver module 2 into I2S format.

[0009] The LED display interface 8 is connected to an external display screen.

[0010] The button interface 7 is connected to several buttons A5 on the surface of the housing A1.

[0011] The working principle of this utility model is as follows: After the device is powered on, the power module supplies power to each part of the circuit, including the main control unit, the eARC / ARC receiving module, the digital audio conversion chip, and the Bluetooth transmitting chip, which are provided with +3.3V and +1.8V DC voltages respectively to ensure the normal operation of the circuit.

[0012] The main control unit first initiates the initialization process, configuring the eARC / ARC receiver module via the control terminal, and sending EDID information to the module as needed to inform the TV of the audio formats supported by this device (such as 2.0CH). Subsequently, the eARC / ARC receiver module connects to the TV's HDMI eARC / ARC interface through its signal receiving terminal to establish an audio communication connection with the TV.

[0013] If the TV supports the eARC protocol, the device will receive audio signals in eARC mode; if the TV only supports the ARC protocol, the device will automatically switch to ARC mode to receive audio signals after the eARC communication times out. The received audio signal is in S / PDIF format, output by the signal output terminal of the eARC / ARC receiver module, and transmitted to the digital audio conversion chip.

[0014] The digital audio converter chip decodes and converts the received S / PDIF signal into a standard I2S audio signal. The chip's control unit is centrally managed and can be configured with parameters and synchronized with data as needed.

[0015] The converted I2S audio signal is sent to the Bluetooth transmitter chip, which encodes it into audio data compatible with the A2DP Bluetooth protocol and transmits it wirelessly through the connected antenna. This process enables real-time wireless output of TV audio to terminals such as Bluetooth headphones.

[0016] Meanwhile, the main control unit also controls the entire Bluetooth pairing process. Users can initiate Bluetooth pairing mode via the button interface. The main control unit receives user input and displays information about pairable Bluetooth devices on the LED display interface, guiding the user through device selection and connection. The main control unit has a pairing information storage function, allowing it to automatically reconnect to the last successfully connected Bluetooth headset upon subsequent power-ups, improving user convenience.

[0017] By adopting the above technical solution, it constructs a compact and fully functional wireless audio transmission circuit, achieving efficient and stable transmission of TV audio signals from the eARC / ARC channel to Bluetooth headphones, and achieving the following technical effects:

[0018] This device uses an eARC / ARC receiver module, which can automatically identify and adapt to the audio transmission protocols supported by different TV devices. It has the function of automatically downgrading from eARC to ARC, ensuring good compatibility with mainstream TV products.

[0019] The main control unit 1 can set EDID information to guide the TV to output an audio format that matches this device (such as 2.0 channel PCM), avoiding the problem of no sound or distortion caused by incompatible audio formats, and achieving stable audio reception.

[0020] It uses a digital audio conversion chip to decode S / PDIF audio signals and convert them into I2S format. Combined with a Bluetooth transmission chip for efficient processing, it achieves high-fidelity audio transmission, ensuring that Bluetooth headphones receive clear and smooth sound signals.

[0021] The main control unit 1 integrates Bluetooth control logic, supporting functions such as quick pairing of Bluetooth headsets, power-off memory, and automatic reconnection, making it more convenient for users. It can connect to the last device as soon as it is turned on, without the need for repeated pairing.

[0022] It features a button interface and an LED display module, which can guide users to complete operations such as Bluetooth device selection and pairing status viewing, making the device setup process visual and user-friendly.

[0023] The circuit design of this utility model adopts a modular design, which is suitable for embedding in TV audio accessories, external audio boxes and other product forms, making it easy to mass-produce and commercialize. It is widely applicable to various scenarios such as home theater, bedroom movie viewing and nighttime silent listening. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 yes Figure 1 Another viewpoint;

[0027] Figure 3 This is a schematic diagram of the circuit structure of circuit board A4 in this utility model.

[0028] Explanation of reference numerals in the attached diagram: Housing A1, HDMI interface A2, antenna interface A3, circuit board A4, button A5, main control unit 1, eARC / ARC receiver module 2, digital audio conversion chip 3, Bluetooth transmitter chip 4, antenna signal transmitter 5, power module 6, button interface 7, LED display interface 8. Detailed Implementation

[0029] See Figure 1-3As shown, the technical solution adopted in this specific embodiment is as follows: It includes a housing A1, an HDMI interface A2, and an antenna interface A3. A circuit board A4 is disposed inside the housing A1, and several buttons A5 are disposed on the surface of the housing A1. The HDMI interface A2 and the antenna interface A3 are respectively disposed at both ends of the housing A1. The circuit of the circuit board A4 includes a main control unit 1, an eARC / ARC receiver module 2, a digital audio conversion chip 3, a Bluetooth transmitter chip 4, an antenna signal transmitter 5, a power module 6, a button interface 7, and an LED display interface 8. The signal receiving end of the eARC / ARC receiver module 2 is connected to the EARC terminal of the TV, the control end of the eARC / ARC receiver module 2 is connected to the main control unit 1, the signal output end of the eARC / ARC receiver module 2 is connected to the signal input end of the digital audio conversion chip 3, and the audio signal output end of the digital audio conversion chip 3 is connected via Bluetooth. The transmitting chip 4 is connected to the antenna signal transmitter 5; the control terminals of the digital audio conversion chip 3 and the Bluetooth transmitting chip 4 are connected to the main control unit 1; the power module 6 provides +1.8V and +3.3V DC power to the overall circuit; the display output terminal of the main control unit 1 is connected to the LED display interface 8; the control terminal of the main control unit 1 is connected to the button interface 7; the eARC / ARC receiver module 2 is connected to the television via the eARC / ARC interface; the eARC / ARC receiver module 2 is based on the EP9511 chip and supports EDID setting and audio reception; the digital audio conversion chip 3 uses the audio format conversion chip 8416, which is used to convert the S / PDIF signal output by the eARC / ARC receiver module 2 into I2S format; the LED display interface 8 is connected to an external display screen; the button interface 7 is connected to several buttons A5 on the surface of the housing A1.

[0030] This specific implementation method constructs a compact and fully functional wireless audio transmission circuit, achieving efficient and stable transmission of television audio signals from the eARC / ARC channel to Bluetooth headphones, and has the following technical effects:

[0031] This device uses an eARC / ARC receiver module, which can automatically identify and adapt to the audio transmission protocols supported by different TV devices. It has the function of automatically downgrading from eARC to ARC, ensuring good compatibility with mainstream TV products.

[0032] The main control unit 1 can set EDID information to guide the TV to output an audio format that matches this device (such as 2.0 channel PCM), avoiding the problem of no sound or distortion caused by incompatible audio formats, and achieving stable audio reception.

[0033] The circuit scheme of this specific embodiment adopts a modular design, which is suitable for embedding in TV audio accessories, external audio boxes and other product forms, making it easy to mass-produce and commercialize. It is widely applicable to various scenarios such as home theater, bedroom movie viewing and nighttime silent listening.

[0034] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A wireless audio transmission device supporting eARC to Bluetooth audio output, characterized in that: It includes a housing (A1), an HDMI interface (A2), and an antenna interface (A3). A circuit board (A4) is installed inside the housing (A1), and several buttons (A5) are installed on the surface of the housing (A1). The HDMI interface (A2) and the antenna interface (A3) are respectively located at both ends of the housing (A1). The circuit of the circuit board (A4) includes a main control unit (1), an eARC / ARC receiver module (2), a digital audio conversion chip (3), a Bluetooth transmitter chip (4), an antenna signal transmitter (5), a power module (6), a button interface (7), and an LED display interface (8). The signal receiver of the eARC / ARC receiver module (2) is connected to the HDMI port of the TV. At the RC end, the control end of the eARC / ARC receiver module (2) is connected to the main control unit (1), the signal output end of the eARC / ARC receiver module (2) is connected to the signal input end of the digital audio converter chip (3), and the audio signal output end of the digital audio converter chip (3) is connected to the antenna signal transmitter end (5) through the Bluetooth transmitter chip (4); the control ends of the digital audio converter chip (3) and the Bluetooth transmitter chip (4) are connected to the main control unit (1); the power module (6) provides +1.8V and +3.3V DC power to the overall circuit, the display output end of the main control unit (1) is connected to the LED display interface (8), and the control end of the main control unit (1) is connected to the button interface (7).

2. The wireless audio transmission device supporting eARC to Bluetooth audio output according to claim 1, characterized in that: The eARC / ARC receiver module (2) is connected to the TV via an eARC / ARC interface. The eARC / ARC receiver module (2) is based on the EP9511 chip and supports EDID setting and audio reception.

3. The wireless audio transmission device supporting eARC to Bluetooth audio output according to claim 1, characterized in that: The digital audio conversion chip (3) is an audio format conversion chip 8416. The digital audio conversion chip (3) is used to convert the S / PDIF signal output by the eARC / ARC receiver module (2) into I2S format.

4. A wireless audio transmission device supporting eARC to Bluetooth audio output according to claim 1, characterized in that: The LED display interface (8) is connected to an external display screen.

5. A wireless audio transmission device supporting eARC to Bluetooth audio output according to claim 1, characterized in that: The button interface (7) connects to several buttons (A5) on the surface of the housing (A1).

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