A multi-format output conversion device for eARC audio signals

Abstract

A multi-format output conversion device based on eARC audio signals is disclosed, relating to the field of audio signal conversion, and particularly to a multi-format output conversion device based on eARC audio signals. To achieve the above objective, this utility model adopts the following technical solution: it includes a housing, an HDMI connector, a circuit board, and an output connector. The circuit board is disposed within the housing, with an HDMI connector and an output connector respectively located at both ends of the housing. The output connector is either an SPDIF output connector or an RCA interface connector. The circuit board includes a main control unit, an eARC receiver chip, an audio receiver shaping logic chip, an SPDIF output interface, and a power module. The eARC receiver chip connects to a television device via the HDMI interface. The television communicates and controls with the main control unit through the eARC receiver chip. The output of the eARC receiver chip is connected to the audio receiver shaping logic chip, and the output of the audio receiver shaping logic chip is connected to the SPDIF output interface. The power module supplies power to each chip unit. It can convert audio signals input via HDMI eARC into SPDIF optical fiber signals or analog RCA signals for output according to different needs; it is compatible with both SPDIF and RCA traditional audio interfaces.

Description

Technical Field

[0001] This utility model relates to the field of audio signal conversion, and in particular to a multi-standard output conversion device based on eARC audio signals. Background Technology

[0002] Currently, the HDMI interface, as the mainstream audio and video transmission standard, is widely used in TVs, set-top boxes, and home theater systems. The eARC (Enhanced Audio Return Channel) protocol introduced in HDMI version 2.1 can support high-bandwidth, high-bitrate lossless audio return, such as Dolby TrueHD and DTS-HD Master Audio, significantly improving audio quality.

[0003] However, many audio receivers on the market, such as speakers and amplifiers, still rely on traditional SPDIF optical or RCA analog input interfaces. These devices typically do not support HDMI or eARC protocols, causing compatibility issues when connecting new TVs or digital media devices. Although some audio converters have emerged, most are limited in function, only supporting eARC to SPDIF or eARC to analog output, and lack flexible automatic recognition and format switching capabilities, resulting in a poor user experience and insufficient practicality. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a multi-format output conversion device based on ARC audio signals. This device can convert audio signals input via HDMI eARC into SPDIF optical fiber signals or analog RCA signals for output according to different needs. It is compatible with both SPDIF and RCA, two traditional audio interfaces.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: it includes a housing A1, an HDMI connector A2, a circuit board A3, and an output connector A4. The circuit board A3 is disposed inside the housing A1, and the two ends of the housing A1 are respectively provided with the HDMI connector A2 and the output connector A4. The output connector A4 is an SPDIF output connector 4 or an RCA interface 9. The circuit of the circuit board A3 includes a main control unit 1, an eARC receiver chip 2, an audio receiver shaping logic chip 3, an SPDIF output interface 4, and a power module 10. The eARC receiver chip 2 is connected to the television device through the HDMI interface A1. The television communicates and controls with the main control unit 1 through the eARC receiver chip 2. The output end of the eARC receiver chip 2 is connected to the audio receiver shaping logic chip 3, and the output end of the audio receiver shaping logic chip 3 is connected to the SPDIF output interface 4. The power module 10 supplies power to each chip unit.

[0006] The output connector A4 is the SPDIF output interface 4. The SPDIF output interface 4 is a coaxial interface, which uses a standard RCA connector and coaxial cable to transmit digital signals; the cable is inexpensive and has good compatibility; however, its anti-interference ability is not as good as that of optical fiber.

[0007] The main control unit 1 uses the MU18 series chip.

[0008] The audio receiving and shaping logic chip 3 is an SN74LVC2GU04 chip.

[0009] The working principle of this invention is as follows: Audio signal reception and output are achieved based on HDMI eARC technology. After the device is powered on, it is supplied by the power module 10, the main control unit 1 starts, reads the stored audio support configuration, and writes the EDID content to the eARC receiver chip 2 via the I2C interface. The eARC receiver chip 2, based on the set EDID, enables the HPD (Hot Plug Detect) mechanism to detect the HDMI connection. When the TV detects that this device supports eARC, it transmits its audio signal to the audio receiving and shaping logic chip 3 through the HDMI port.

[0010] If the TV supports the eARC protocol, the eARC receiver chip 2 establishes eARC communication with it, and the TV sends the audio stream in the corresponding format (usually 5.1CH or 2.0CH) according to the EDID requirements. If the TV does not support eARC, the eARC receiver chip 2 automatically switches to ARC mode to continue acquiring the audio stream after the communication timeout. The audio receiving and shaping logic chip 3 converts the received audio data into SPDIF format in real time and outputs it to the SPDIF output interface 4, which is the optical fiber interface. Users can transmit the signal to digital audio devices such as speakers, amplifiers, and decoders through optical fiber cables to achieve high-fidelity audio playback.

[0011] The advantages of this utility model after adopting the above technical solution are as follows: it can receive eARC / ARC audio signals from devices such as TVs through the HDMI interface, achieving high compatibility with existing TV systems; it analyzes the eARC / ARC signals through the eARC receiver chip 2 and stably outputs standard SPDIF optical fiber audio signals, facilitating connection to digital audio equipment, amplifiers, and other devices; it dynamically configures EDID through the main control unit 1, supporting the selection of 5.1CH or 2.0CH audio channels, improving audio adaptability; the system can automatically determine the eARC support status and automatically fall back to ARC mode when eARC is unavailable, enhancing the device's environmental adaptability; this utility model has a simple module structure, high chip integration, and low overall cost, making it suitable for mass deployment in TV external audio expansion applications. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 Internal structure diagram;

[0015] Figure 3 yes Figure 2 Another viewpoint;

[0016] Figure 4 This is a schematic diagram of the circuit structure of Example 1;

[0017] Figure 5 This is a schematic diagram of the circuit structure of Example 2.

[0018] Explanation of reference numerals in the attached diagram: Housing A1, HDMI connector A2, Circuit board A3, Output connector A4, Main control unit 1, eARC receiver chip 2, Audio receiver shaping logic chip 3, SPDIF output interface 4, Power module 10, Audio receiver chip 5, Decoding chip ( ), Audio processing and volume control chip 7, Operational amplifier unit 8, RCA interface terminal 9. Detailed Implementation

[0019] Example 1

[0020] See Figure 1-4As shown, this embodiment 1 includes a housing A1, an HDMI connector A2, a circuit board A3, and an output connector A4. The circuit board A3 is disposed inside the housing A1. The housing A1 has an HDMI connector A2 and an output connector A4 at its two ends, respectively. The output connector A4 is either an SPDIF output connector 4 or an RCA interface 9. The circuit of the circuit board A3 includes a main control unit 1, an eARC receiver chip 2, an audio receiver shaping logic chip 3, an SPDIF output interface 4, and a power module 10. The eARC receiver chip 2 is connected to a television device via the HDMI interface A1. The television and the eARC receiver chip 2 communicate and control each other. The output of the eARC receiver chip 2 is connected to the audio receiver shaping logic chip 3, and the output of the audio receiver shaping logic chip 3 is connected to the SPDIF output interface 4. The power module 10 supplies power to each chip unit. The output connector A4 is the SPDIF output interface 4. The SPDIF output interface 4 is a coaxial interface, using a standard RCA connector and coaxial cable to transmit digital signals; the cable is inexpensive and has good compatibility; however, its anti-interference performance is not as good as that of optical fiber. The main control unit 1 uses the MU18 series chip. The audio receiving and shaping logic chip 3 is an SN74LVC2GU04 chip.

[0021] Example 2

[0022] See Figure 1 , 2 As shown in Figures 3 and 5, this embodiment includes a housing A1, an HDMI connector A2, a circuit board A3, and an output connector A4. The circuit board A3 is disposed inside the housing A1. The two ends of the housing A1 are respectively provided with the HDMI connector A2 and the output connector A4. The output connector A4 is an RCA interface terminal 9. The circuit of the circuit board A3 includes a main control unit 1, an eARC receiver chip 2, an audio receiver chip 5, a decoding chip 6, an audio processing and volume control chip 7, an operational amplifier unit 8, and an RCA interface terminal 9. The eARC receiver chip 2 is connected to the television device through the HDMI interface A1. The input terminal of the decoding chip 6 is connected to the audio output terminal of the eARC receiver chip 2 through the audio receiver chip 5. The audio processing and volume control chip 7 is connected to the output terminal of the audio receiver chip 5 through the decoding chip 6. The signal output terminal of the audio processing and volume control chip 7 is connected to the RCA interface 9 through the operational amplifier chip 8. The eARC receiver chip 2, the audio receiver chip 5, and the audio processing and volume control chip 7 are all interconnected with the main control unit 1.

[0023] The audio receiver chip 5 is a CS8416. The audio receiver chip 5 receives the SPDIF audio signal output from the eARC receiver chip 2; and converts the SPDIF signal into a standard I2S format audio data stream for output.

[0024] The decoding chip 6 is a PCM4344. The decoding chip 6 receives the I2S digital audio signal output by the audio receiving chip 5, converts the I2S digital audio signal into an analog stereo audio signal (left channel L, right channel R); and outputs the analog audio signal to the audio processing and volume control chip 7 for volume control and further processing.

[0025] The audio processing and volume control chip 7 is a CJC8988 chip. The audio processing and volume control chip 7 is an audio signal conditioning chip and an audio pre-processing chip.

[0026] This embodiment analyzes and converts the HDMI eARC return audio signal from the TV into a standard stereo analog signal, outputting it through the RCA interface to adapt to traditional audio equipment, amplifiers, and other analog input devices. Its detailed operation is as follows: After the device is powered on, the power module 10 converts the input voltage into multiple output voltages to supply each chip circuit. The main control unit 1 sets the EDID with the eARC receiver chip 2 via the I2C interface. The eARC receiver chip 2 detects whether a TV is connected through the HDMI interface and negotiates the eARC protocol based on the EDID: if the TV supports eARC, the eARC receiver chip 2 receives a 2.0CH audio stream conforming to the EDID from the TV; if the TV does not support eARC, it automatically switches to ARC mode to receive the optical audio stream.

[0027] This embodiment can automatically identify whether the TV supports eARC and automatically fall back to ARC communication mode in case of timeout, ensuring reliable audio signal access. The audio path adopts a complete link of digital receiver (SPDIF) → I2S → high-performance DAC → analog amplifier, and finally outputs standard RCA analog stereo, with stable and clear sound quality, high signal-to-noise ratio, and low distortion. It is equipped with an operational amplifier unit 8 with an I2C interface, which supports the main control unit 1 to automatically adjust the volume, mute, and perform status judgment, meeting various user needs and usage scenarios. The output adopts a universal dual-channel RCA interface design, which is perfectly compatible with traditional speakers, amplifiers, old TV audio systems, and other devices, improving interoperability between devices. All processing chips are uniformly managed through the I2C bus and coordinated by the active power supply 1, which facilitates system integration and subsequent function expansion, making it suitable for home audio-visual, conference audio, and commercial multimedia scenarios.

[0028] 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. An eARC audio signal based multi-format output conversion apparatus, characterized by: It includes a housing (A1), an HDMI connector (A2), a circuit board (A3), and an output connector (A4). The circuit board (A3) is located inside the housing (A1). The two ends of the housing (A1) are respectively provided with an HDMI connector (A2) and an output connector (A4). The output connector (A4) is an SPDIF output connector (4) or an RCA interface (9). The circuit of the circuit board (A3) includes a main control unit (1), an eARC receiver chip (2), an audio receiver shaping logic chip (3), an SPDIF output interface (4), and a power module (10). The ARC receiver port (2) is connected to the TV device through the HDMI interface A1. The TV communicates with the main control unit (1) through the ARC receiver port (2). The output end of the ARC receiver port (2) is connected to the audio receiver shaping logic chip (3). The output end of the audio receiver shaping logic chip (3) is connected to the SPDIF output interface (4). The power module (10) supplies power to each chip unit.

2. The multi-format output conversion device based on eARC audio signal according to claim 1, characterized in that: The output connector (A4) is the SPDIF output interface 4.

3. The multi-format output conversion device based on eARC audio signal according to claim 1, characterized in that: The main control unit (1) uses the MU18 series chip.

4. The multi-format output conversion device based on eARC audio signals according to claim 1, characterized in that: The audio receiving and shaping logic chip (3) is selected from the SN74LVC2GU04 chip.

5. The multi-format output conversion device based on eARC audio signals according to claim 1, characterized in that: The output connector (A4) is an RCA interface (9).

6. The multi-format output conversion device for eARC audio signals according to claim 1, characterized in that: It includes a housing (A1), an HDMI connector (A2), a circuit board (A3), and an output connector (A4). The circuit board (A3) is located inside the housing (A1). The housing (A1) has an HDMI connector (A2) and an output connector (A4) at both ends. The output connector (A4) is an RCA interface (9). The circuit of the circuit board (A3) includes a main control unit (1), an eARC receiver chip (2), an audio receiver chip (5), a decoding chip (6), an audio processing and volume control chip (7), an operational amplifier unit (8), and an RCA interface (9). The RC receiver chip (2) is connected to the TV device through the HDMI interface (A1). The input end of the decoder chip (6) is connected to the audio output end of the eARC receiver chip (2) through the audio receiver chip (5). The audio processing and volume control chip (7) is connected to the output end of the audio receiver chip (5) through the decoder chip (6). The signal output end of the audio processing and volume control chip (7) is connected to the RCA interface (9) through the operational amplifier chip (8). The eARC receiver chip (2), the audio receiver chip (5) and the audio processing and volume control chip (7) are connected to the main control unit (1).

7. The multi-format output conversion device for eARC audio signals according to claim 6, characterized in that: The decoding chip (6) is PCM4344.

8. The multi-format output conversion device for eARC audio signals according to claim 6, characterized in that: The audio processing and volume control chip (7) is CJC8988.

9. A multi-format output conversion device for eARC audio signals according to claim 6, characterized in that: The audio receiver chip (5) is selected as the CS8416 chip.

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