Panoramic sound decoding player and sound system applied to automobile after modification

Abstract

The application provides a panoramic sound decoding player and a sound system applied to automobile rear modification, the panoramic sound decoding player comprises a front set and a rear set, the front set comprises an Android board, a decoding board and a DSP board which are sequentially connected by wires, the Android board runs a music playing application, unpacks an audio file and identifies an audio format, and when the panoramic sound format is identified, the unpacked audio data is transmitted to the decoding board, the decoding board decodes the audio data in the panoramic sound format to obtain a decoded audio signal, and the DSP board performs audio processing on the decoded audio signal; the rear set comprises a power amplifier board which performs power amplification on the audio signal after audio processing; a first port for connecting a vehicle-mounted control panel is arranged on the front set, a second port for connecting a vehicle-mounted sound unit is arranged on the rear set, and the front set and the rear set are connected by a cable; the split structure not only realizes panoramic sound decoding, but also reduces the size and heat dissipation, and improves the adaptability to the whole vehicle.

Description

Technical Field

[0001] This application relates to the field of automotive audio technology, and more specifically, to a panoramic sound decoding player and audio system for automotive aftermarket modification. Background Technology

[0002] With the rapid development of audio technology, consumers have increasingly higher requirements for the quality of car audio systems, hoping to obtain a more immersive audio experience.

[0003] However, most existing aftermarket car audio systems only support stereo (2.0 / 2.1) or surround sound (5.1 / 7.1) formats, and cannot decode and reproduce multi-channel immersive sound (7.1.4) formats. This prevents users from experiencing an immersive listening experience with a sense of three-dimensional spatial positioning in the car environment. When playing immersive sound audio, existing devices are limited by their hardware architecture and cannot complete the decoding and corresponding multi-channel signal processing. Utility Model Content

[0004] This application provides a panoramic sound decoding player, a car audio system, and a control method for automotive aftermarket modification, in order to address the current lack of dedicated hardware devices capable of supporting panoramic sound decoding in the automotive audio aftermarket modification field.

[0005] In a first aspect, this application provides a panoramic sound decoding player for automotive aftermarket modification, comprising:

[0006] The first part includes an Android board, a decoding board, and a DSP board connected in sequence by wires. The Android board is used to run a music playback application, which decapsulates audio files and identifies audio formats based on the music playback application. When the immersive sound format is identified, the decapsulated audio data is passed through to the decoding board. The decoding board is used to decode the immersive sound format audio data to obtain the decoded audio signal. The DSP board is used to perform audio processing on the decoded audio signal.

[0007] The back unit, including the power amplifier board, is used to amplify the power of the processed audio signal;

[0008] The front unit is provided with a first port for connecting to the vehicle control panel, and the rear unit is provided with a second port for connecting to the vehicle sound unit. The front unit and the rear unit are connected by a cable.

[0009] In some embodiments, the Android board is also wired to the DSP board, and is used to pass through the decapsulated audio data to the DSP board when the music playback application on the Android board recognizes a non-Atmos format.

[0010] In some embodiments, the music playback application on the Android board is further configured to receive volume adjustment commands and send the volume adjustment commands to the DSP board;

[0011] The DSP board is also used to adjust the digital gain of the audio signal in response to the volume adjustment command.

[0012] In some embodiments, the front set includes a first housing, the Android board and the decoding board are stacked in a first region within the first housing, and the DSP board is stacked in a second region within the first housing;

[0013] The rear assembly includes a second housing, and the power amplifier board is disposed within the second housing.

[0014] In some embodiments, the decoding board uses an ADI21569 decoding chip, which supports immersive sound decoding algorithms.

[0015] In some embodiments, the cable between the front set and the back set includes at least 12 core wires for lossless transmission of the multi-channel audio signals processed by the DSP board to the power amplifier board of the back set.

[0016] Secondly, this application provides an aftermarket car audio system, including a panoramic sound decoding player, an in-vehicle control panel, and an in-vehicle sound unit as described in any of the first aspects, wherein the layout of the in-vehicle sound unit matches the panoramic sound channel format.

[0017] The front unit is wired to the vehicle control panel via a first port;

[0018] The rear unit is wiredly connected to the vehicle-mounted sound unit via a second port.

[0019] Thirdly, this application provides a control method for an aftermarket car audio system, applied to the aftermarket car audio system described in the second aspect, the method comprising:

[0020] Based on receiving user input of audio playback or audio switching commands through the vehicle control panel;

[0021] The music playback application on the Android board responds to the audio playback command or audio switching command by decapsulating the audio file to be played or switched and identifying the audio format.

[0022] When the immersive audio format is detected, the decapsulated audio data is passed through to the decoding board;

[0023] The audio data in the Dolby Atmos format is decoded using a decoding board to obtain the decoded audio signal.

[0024] Audio processing of the decoded audio signal is performed using a DSP board;

[0025] The power amplifier board amplifies the audio signal after audio processing.

[0026] Based on the amplified audio signal output from the vehicle-mounted sound unit.

[0027] In some embodiments, the method further includes:

[0028] When the music playback application on the Android board detects a non-Atmos format, it transmits the decapsulated audio data to the DSP board.

[0029] In some embodiments, the method further includes:

[0030] Based on receiving volume adjustment commands input by the user from the vehicle's control panel;

[0031] The music playback application on the Android board receives volume adjustment commands and sends the volume adjustment commands to the DSP board.

[0032] Based on the DSP board's response to the volume adjustment command, the digital gain of the audio signal is adjusted.

[0033] The panoramic sound decoding player and audio system for automotive aftermarket modification provided in this application adopts a split front-end and rear-end design. The front-end integrates an Android board, a decoding board, and a DSP board: the Android board handles audio format recognition and data pass-through, the decoding board specifically processes panoramic sound signals, and the DSP board optimizes multi-channel audio signals. The rear-end is a separate amplifier board, focusing on power amplification of the audio signals processed by the front-end. This split architecture not only achieves panoramic sound decoding functionality in the automotive aftermarket but also effectively reduces the size of individual components through the separate layout of the front and rear ends, while also facilitating heat dissipation and improving compatibility with the vehicle. Attached Figure Description

[0034] Figure 1 A schematic diagram of the structure of a panoramic sound decoding player for automotive aftermarket modification provided in this application;

[0035] Figure 2a A schematic diagram of a preset structure provided in an embodiment of this application;

[0036] Figure 2b A schematic diagram of a post-set structure provided in an embodiment of this application;

[0037] Figure 3 A schematic diagram of the internal structure of the front housing provided in an embodiment of this application;

[0038] Figure 4This application provides a schematic diagram of the structure of an aftermarket car audio system.

[0039] Figure 5 A flowchart illustrating a control method for an aftermarket car audio system provided in this application embodiment;

[0040] Figure 6 A schematic diagram of an in-vehicle control panel provided in an embodiment of this application;

[0041] 10 - Prequel; 101 - Android board; 102 - Decoder board; 103 - DSP board; 20 - Post-production; 201 - Power amplifier board. Detailed Implementation

[0042] To make the purpose, technical solution, and advantages of this application example clearer, the technical solution of this application example will be clearly and completely described below with reference to the accompanying drawings.

[0043] First, let me explain the terms used in this application:

[0044] Immersive sound is an acoustic technology based on multi-channel audio systems (such as speaker arrays or headphones). Through spatial localization algorithms and three-dimensional sound field modeling, it allows listeners to perceive the dynamic distribution of sound sources in both horizontal and vertical directions. Immersive sound breaks through the limitations of traditional two-dimensional planar sound fields, accurately reproducing the position and movement trajectory of sound objects in three-dimensional space, thus creating a highly immersive audio experience. For example, 7.1.4 Immersive sound is a widely used channel configuration that includes seven horizontal surround channels, one low-frequency effects channel, and four top height channels, collectively constructing an immersive three-dimensional sound field.

[0045] In the aftermarket car audio industry, there is currently a lack of dedicated hardware capable of supporting the decoding and playback of immersive sound (such as 7.1.4 channels). Traditional aftermarket equipment typically only supports stereo or surround sound audio files and cannot decode and reproduce multi-channel immersive sound formats, preventing users from obtaining an immersive listening experience with a sense of three-dimensional spatial positioning in the in-car environment. When playing immersive sound audio, existing devices are limited by hardware architecture and cannot complete the decoding and corresponding multi-channel signal processing.

[0046] To address the aforementioned issues, this application proposes a split hardware architecture comprising a front-end and a back-end. The front-end integrates an Android board, a decoding board, and a digital signal processor (DSP) board: the Android board handles audio format recognition and data pass-through, the decoding board specifically processes the immersive sound signal, and the DSP board optimizes multi-channel audio signals. The back-end is a separate amplifier board focused on amplifying the power of the audio signal processed by the front-end. This split architecture not only enables immersive sound decoding in the automotive aftermarket but also effectively reduces the size of individual components through the separate layout of the front and back ends, while also improving heat dissipation and thus enhancing compatibility with vehicle installation.

[0047] Firstly, this application provides an example of a surround sound decoding player for automotive aftermarket modification. Figure 1 This application provides a structural schematic diagram of a panoramic sound decoding player for automotive aftermarket modification.

[0048] like Figure 1 As shown, the immersive sound decoding player includes:

[0049] The first part 10 includes an Android board 101, a decoding board 102, and a DSP board 103 connected in sequence by wires. The Android board 101 is used to run a music playback application, which decapsulates audio files and identifies audio formats based on the music playback application. When the immersive sound format is identified, the decapsulated audio data is passed through to the decoding board 102. The decoding board 102 is used to decode the immersive sound format audio data to obtain the decoded audio signal. The DSP board 103 is used to perform audio processing on the decoded audio signal.

[0050] The latter part 20 includes a power amplifier board 201, which is used to amplify the power of the audio signal after audio processing;

[0051] The front unit 10 is provided with a first port for connecting to the vehicle control panel, and the rear unit 20 is provided with a second port for connecting to the vehicle sound unit. The front unit 10 and the rear unit 20 are connected by a cable.

[0052] Specifically, the immersive sound decoding player adopts a split structure, including a front unit 10 and a rear unit 20. The front unit 10 consists of an Android board 101, a decoding board 102, and a DSP board 103. These boards are connected via wired connections; for example, the Android board 101 is connected to the decoding board 102 via an FPC flexible cable, and the decoding board 102 is connected to the DSP board 103 via a wiring harness. The Android board 101 runs the Android system and a music playback application, used to depackage audio files and identify audio formats. The decoding board 102 performs hardware decoding of the immersive sound format audio data. The DSP board 103 performs sound effect processing on the decoded audio signal, including gain, delay, and sound field optimization. The front unit 10 also has a first port for connecting to the vehicle control panel. The rear unit 20 includes a power amplifier board 201, used to boost the audio signal output from the front unit 10 after audio processing to the power level required to drive the vehicle's sound unit. The rear unit 20 also has a second port for connecting to the vehicle's sound unit.

[0053] When modifying a car using this panoramic sound decoder player, simply connect the first port of the front unit 10 to the car control panel and the second port of the rear unit 20 to the car's sound unit; the modification operation is convenient.

[0054] During use, the Android board 101 decapsulates and identifies the audio format of the audio file through a music playback application. When the audio format is identified as Dolby Atmos, the decapsulated audio data is transmitted to the decoding board 102. The decoding board 102 performs hardware decoding on the audio data to generate a signal containing multiple channels. After receiving the decoded multi-channel signal, the DSP board 103 optimizes the multi-channel signal, including adjusting the delay, gain, frequency and amplitude of each channel, while realizing equalization adjustment, surround sound and 3D sound effects, sound field simulation and noise reduction functions. The processed multi-channel signal is transmitted to the power amplifier board 201 of the back unit 20 through a dedicated custom wiring harness. The power amplifier board 201 amplifies the audio signal and outputs it to the multi-channel layout of the car speakers to form a three-dimensional sound field coverage.

[0055] It should be noted that in order to achieve the immersive sound playback effect, the layout of the car speakers must match the immersive sound channels; taking 7.1.4 immersive sound as an example, its car speakers must correspond to speakers with 12 channels, specifically the left channel, center channel, right channel, left and right side surround channels, left and right rear surround channels (a total of 7 horizontal channels), left and right front overhead channels, left and right rear overhead channels (a total of 4 top channels) and subwoofer channel speakers.

[0056] The panoramic sound decoding player provided in this application for automotive aftermarket modification adopts a split front-end and rear-end design. The front-end integrates an Android board, a decoding board, and a DSP board: the Android board handles audio format recognition and data pass-through, the decoding board specifically processes panoramic sound signals, and the DSP board optimizes multi-channel audio signals. The rear-end is a separate amplifier board, focusing on power amplification of the audio signals processed by the front-end. This split architecture not only achieves panoramic sound decoding functionality in the automotive aftermarket modification field but also effectively reduces the size of individual components through the separate layout of the front and rear ends, while also facilitating heat dissipation and improving installation compatibility with the vehicle.

[0057] Based on the foregoing embodiments, this application further proposes that: the Android board 101 is also wiredly connected to the DSP board 103, and when the music playback application on the Android board 101 identifies a non-Atmos format, it transmits the decapsulated audio data to the DSP board 103.

[0058] Specifically, the wired connection between Android board 101 and DSP board 103 refers to establishing a data transmission channel through physical lines, which can be implemented using ribbon cables. This connection method allows data to be transmitted directly, bypassing the decoder board 102. Non-Atmos formats refer to audio formats that do not conform to the Atmos coding standard, such as stereo or surround sound formats.

[0059] When the music playback application on Android board 101 recognizes that the audio file is in stereo or surround sound format, the decapsulated audio data bypasses the decoder board 102 and directly enters the DSP processing stage. This not only preserves the compatibility of the original audio format, but also avoids redundant decoding operations from occupying system resources.

[0060] Through the above technical solution, this application achieves compatible processing of traditional stereo and surround sound formats, ensuring that audio data with different encoding standards can obtain an appropriate processing flow, while optimizing system resource allocation and avoiding invalid operation of the decoder board 102 in non-Dolby Atmos scenarios.

[0061] Based on the foregoing embodiments, this application further proposes that: the music playback application on the Android board 101 is also used to receive a volume adjustment command and send the volume adjustment command to the DSP board 103; the DSP board 103 is also used to adjust the digital gain of the audio signal in response to the volume adjustment command.

[0062] The volume adjustment command refers to the control signal input by the user through the vehicle control panel to adjust the audio output intensity. This command establishes a direct control link between the Android board 101 and the DSP board 103, so that volume adjustment does not rely on analog circuitry. Digital gain refers to scaling the amplitude of the audio signal through digital signal processing algorithms. By adjusting the digital gain, volume control can be completed in the digital domain stage of the signal processing link, avoiding the noise introduced by analog gain adjustment.

[0063] Specifically, when a user generates a volume adjustment command by operating the vehicle's control panel, the music playback application on the Android board 101 receives the command and converts it into a control signal recognizable by the DSP board 103. Based on the received control signal, the DSP board 103 applies corresponding digital gain adjustment to the currently processed audio signal. For example, in non-Dolby Atmos audio playback scenarios, the DSP board 103 adjusts the digital gain value of the multi-channel audio signal to achieve unified volume adjustment for each channel. Since the gain adjustment occurs during the digital signal processing stage, there is no need to add additional analog potentiometers or attenuation circuits, thereby reducing the risk of distortion in the signal transmission path.

[0064] Compared to existing technologies, traditional aftermarket car audio systems typically use analog potentiometers or voltage divider circuits for volume control. These methods are prone to introducing noise during signal transmission, and their adjustment accuracy is limited by the potentiometer's mechanical structure. This application, however, utilizes a digital gain adjustment mechanism to directly control volume in the digital domain, eliminating analog circuit noise interference and improving adjustment accuracy. Furthermore, direct instruction connection between the Android board 101 and the DSP board 103 simplifies system design.

[0065] Through the above technical solution, this application achieves high-precision volume control through a digital gain adjustment mechanism, avoids signal degradation in the analog signal path, reduces system complexity, and improves the user's operating experience in multi-format audio playback scenarios.

[0066] Based on the foregoing embodiments, this application further proposes that: the pre-set 10 includes a first housing, the Android board 101 and the decoder board 102 are superimposed in a first region within the first housing, and the DSP board 103 is superimposed in a second region within the first housing; the post-set 20 includes a second housing, and the power amplifier board 201 is disposed within the second housing.

[0067] like Figure 2a A schematic diagram of a preset structure provided for an embodiment of this application, such as... Figure 2b This is a schematic diagram of a back-end structure provided in an embodiment of this application. Figure 2a , 2bIt can be seen that the front unit 10 and the rear unit 20 are two independent shells. The separate design of the two not only helps heat dissipation, but also reduces the size of a single component, making it easier to adapt to the installation space of the car. Preferably, the external dimensions of the front unit 10 and the rear unit 20 are both 377mm long × 200mm wide × 50mm high.

[0068] like Figure 3 This is a schematic diagram of the internal structure of a front housing provided in an embodiment of this application, combined with... Figure 3 As can be seen, the first shell of the first part 10 is divided into a first area and a second area: the Android board 101 and the decoding board 102 are installed in the first area in a stacked manner (the Android board 101 is located at the bottom and the decoding board 102 is located at the top), and the DSP board 103 is installed in the second area (due to size limitations, the DSP board 103 is split into two parts and installed in a stacked manner).

[0069] Compared to existing technologies, traditional car audio modification equipment integrates all functional modules into a single housing. This not only results in excessive space occupied by the circuit board layout but also leads to poor heat dissipation because the high-power module and the front-end processing module share the same cavity. This embodiment uses a split housing design to separate the front unit 10 and the rear unit 20. The front unit employs a partitioned, stacked layout to compress space, while the rear unit 20 uses an independent housing to isolate the heat source of the high-power module. This effectively solves the problems of limited installation space in the car and thermal interference affecting equipment operation.

[0070] Through the above technical solution, this application realizes the modular layout of the hardware structure of the panoramic sound decoding player: the superimposed design of the front unit integrates the decoding and signal processing units in a limited space, and the independent shell of the rear unit avoids the influence of the heat source of the high-power module on the signal processing accuracy of the front unit. At the same time, the separate structure of the two facilitates installation and adaptation in different positions of the car.

[0071] Based on the foregoing embodiments, this application further proposes that: the decoding board 102 adopts an ADI21569 decoding chip, and the ADI21569 decoding chip supports panoramic sound decoding algorithms.

[0072] Specifically, the ADI21569 decoding chip is an integrated circuit chip with immersive audio hardware decoding capabilities. Its built-in hardware decoding module can parse multi-channel audio encoding formats, providing core hardware support for 7.1.4 immersive audio decoding. The immersive audio decoding algorithm refers to the decoding program used to process three-dimensional audio data and adapt to the 7.1.4 channel layout. This algorithm can identify and separate the audio signals of each channel in the 7.1.4 channel, working in conjunction with the ADI21569 decoding chip to achieve immersive audio hardware decoding functionality.

[0073] The ADI21569 decoding chip, through its integrated panoramic sound decoding algorithm module, decodes the decapsulated audio data transmitted through the Android board 101: first, it extracts the audio data streams corresponding to each channel of the 7.1.4 channel, then completes the decoding operation, and finally generates the PCM audio stream corresponding to the 7.1.4 channel. This PCM audio stream is then transmitted to the DSP board 103 to ensure the synchronization and integrity of signal transmission, meeting the needs of subsequent audio optimization processing by the DSP board 103.

[0074] Compared with existing technologies, traditional automotive decoding chips only support stereo or 5.1 surround sound decoding and lack the ability to process the height channel in 7.1.4 channels, which cannot meet the requirements of immersive sound playback. However, the ADI21569 decoding chip used in this embodiment achieves full support for 7.1.4 immersive sound format through collaboration with the immersive sound decoding algorithm, and at the same time reduces audio processing latency through hardware-level decoding.

[0075] Through the above technical solution, this application solves the problem that traditional decoding chips cannot parse 7.1.4 channel audio data, realizes native support for the immersive sound format, ensures high-fidelity decoding of multi-channel audio signals, and ensures collaborative work with the front-end DSP board, laying the core hardware and algorithm foundation for immersive sound playback in automotive aftermarket scenarios.

[0076] Based on the foregoing embodiments, this application further proposes that the cable between the front set 10 and the rear set 20 includes at least 12 core wires for lossless transmission of the multi-channel audio signals processed by the DSP board 103 to the power amplifier board 201 of the rear set 20.

[0077] Specifically, the cable connecting the front set 10 and the rear set 20 contains at least 12 core wires, that is, the physical cable has 12 independent conductors inside, each conductor can transmit one audio signal; the number of core wires matches the number of 12 independent channels required by the 7.1.4 Dolby Atmos format, each core wire corresponds to the transmission of one channel of audio signal, and physical isolation avoids the mixing of signals from different channels.

[0078] The multiple audio signals output by the DSP board 103 are distributed to the corresponding core wires in the cable, with each core wire independently carrying a single channel signal. The number of core wires meets the channel requirements of the 7.1.4 Dolby Atmos format, ensuring that all channel signals are transmitted synchronously to the power amplifier board 201 in the subsequent set 20. After receiving the independent channel signals transmitted from each core wire, the power amplifier board 201 amplifies them respectively, ultimately driving the vehicle sound unit to achieve Dolby Atmos playback.

[0079] Compared to existing technologies, traditional car audio modifications typically use fewer than 12 wires in the cable, necessitating signal multiplexing or compression techniques when transmitting multi-channel signals, which can easily lead to signal loss or crosstalk. This embodiment sets the number of cable wires to 12, providing an independent transmission channel for each channel directly, eliminating the need for signal multiplexing and avoiding signal mixing and quality degradation issues from a physical structure perspective.

[0080] Through the above technical solution, this application achieves physical isolation of multiple audio signals during transmission, ensuring that each channel signal is transmitted independently and without compression, solving the problem of signal mixing or interference caused by insufficient core wires, providing a high-fidelity input signal for the power amplifier board, and meeting the technical requirements of 7.1.4 Dolby Atmos format for lossless transmission of multiple channels.

[0081] Secondly, this application proposes an aftermarket car audio system. Figure 4 This application provides a schematic diagram of the structure of an aftermarket car audio system, as shown in the embodiment. Figure 4 As shown, the aftermarket car audio system includes:

[0082] The system includes an immersive sound decoding player, a vehicle control panel, and a vehicle sound unit, wherein the layout of the vehicle sound unit matches the immersive sound channel format; the front unit 10 is wired to the vehicle control panel via a first port; and the rear unit 20 is wired to the vehicle sound unit via a second port.

[0083] The panoramic sound decoding player refers to a hardware device composed of a front unit 10 and a rear unit 20. The front unit 10 includes an Android board 101, a decoding board 102, and a digital signal processor board (DSP board 103), used for audio data de-encapsulation, decoding, and signal processing. The rear unit 20 includes a power amplifier board 201 for audio power amplification. A split-shell structure is used to physically separate the front unit 10 and the rear unit 20. The layout of the vehicle-mounted sound units matches the panoramic sound channel format, meaning the number of sound units is configured according to the 7.1.4 channel standard, i.e., 12 vehicle-mounted sound units corresponding to 7 horizontal channels, 1 subwoofer channel, and 4 top channels. The first port is the physical interface used to transmit control signals, enabling command interaction between the vehicle control panel and the front unit 10. The second port is the physical interface used to transmit multiple audio signals, enabling the connection between the power amplifier board 201 and the vehicle-mounted sound units.

[0084] Specifically, the audio signal processing flow is achieved through the collaborative work of the pre-set 10 and the post-set 20: the vehicle control panel sends a playback command to the Android board 101 through the first port. The Android board 101 decapsulates the audio file and identifies the format type. When the 7.1.4 Dolby Atmos format is detected, the decapsulated 12-channel audio data is transmitted to the decoder board 102 through the FPC flexible cable. The decoder board 102 performs hardware decoding using the ADI21569 decoding chip and the Dolby Atmos decoding algorithm to generate the PCM audio stream corresponding to the 7.1.4 channels. The PCM audio stream is transmitted to the DSP board 103 for audio optimization processing (including adjusting the delay, gain, frequency and amplitude of each channel to achieve equalization adjustment, surround sound and 3D sound effects, noise reduction and other functions). The processed multi-channel signal is transmitted to the power amplifier board 201 of the post-set 20 through a dedicated custom wiring harness. The power amplifier board 201 amplifies the power of each channel signal and outputs it to the 12 vehicle sound units arranged in a 7.1.4 channel layout to form a three-dimensional sound field coverage.

[0085] It should also be noted that the Android board uses the Android system, while the vehicle control panel, decoder board, and DSP board use the Linux system. The two systems are compatible and can communicate with each other.

[0086] Compared to existing technologies, traditional aftermarket car audio systems cannot process 7.1.4 surround sound data including the top channel, and the corresponding speaker layout cannot support a three-dimensional sound field, resulting in a loss of sound field height information. This embodiment supports 7.1.4 surround sound decoding through a surround sound decoding player (the Android board 101, decoding board 102, and DSP board 103 of the front unit 10 work in conjunction with the power amplifier board 201 of the rear unit 20). It also employs a layout of 12 car speakers conforming to the 7.1.4 channel standard, enabling the modified system to fully reproduce three-dimensional spatial audio information. Existing technologies, due to hardware architecture limitations, cannot decode and play the top channel signal.

[0087] Through the above technical solution, this application realizes the complete decoding and playback of 7.1.4 panoramic sound format in the automotive aftermarket modification scenario, and solves the problem of sound field flattening caused by the lack of top channel support in traditional equipment. Through the combination of hardware decoding and standardized sound unit layout, the modified car audio can output immersive audio effects including vertical sound source positioning.

[0088] Thirdly, this application proposes a control method for an aftermarket car audio system. Figure 5 This is a flowchart illustrating a control method for an aftermarket car audio system provided in an embodiment of this application.

[0089] like Figure 5 As shown, the control method for this aftermarket car audio system includes:

[0090] Step S501: Receive audio playback commands or audio switching commands input by the user based on the vehicle control panel.

[0091] Step S502: The music playback application on the Android board responds to audio playback commands or audio switching commands by decapsulating the audio file to be played or switched and recognizing the audio format.

[0092] Step S503: When the immersive sound format is detected, the decapsulated audio data is transmitted to the decoding board; the immersive sound format audio data is decoded based on the decoding board to obtain the decoded audio signal.

[0093] Step S504: Perform audio processing on the decoded audio signal based on the DSP board.

[0094] Step S505: Amplify the power of the audio signal after audio processing based on the power amplifier board.

[0095] Step S506: Based on the amplified audio signal output by the vehicle-mounted sound unit.

[0096] like Figure 6 This is a schematic diagram of a vehicle control panel provided in an embodiment of this application. The vehicle control panel consists of a display screen, a knob, and six buttons. It is connected to an Android board 101 via a first port provided in the front unit 10, and is used to control the music playback application APP built into the Android board 101 to perform operations such as play / pause, previous track, next track, mute, and switching audio sources. Specifically, when the user triggers an audio playback operation through the vehicle control panel, the music player APP on the Android board 101 first decapsulates the target audio file, extracts the 12 audio data streams, and detects its encoding format. If the audio data is identified as using 7.1.4 Dolby Atmos format, the decapsulated audio data is transmitted to the decoding board 102 via an FPC flexible cable. The decoding board 102 performs hardware decoding using the built-in ADI21569 decoding chip and Dolby Atmos decoding algorithm to generate the PCM audio stream corresponding to the 7.1.4 channels. The DSP board 103 receives... After the PCM audio stream is processed, audio optimization is performed, including adjusting the delay, gain, frequency and amplitude of each channel. At the same time, equalization adjustment, surround sound and 3D sound effects, and noise reduction functions are implemented to generate an optimized signal that conforms to the in-vehicle acoustic environment. The power amplifier board 201 of the rear amplifier 20 amplifies the optimized multi-channel signal and finally outputs it to 12 in-vehicle sound units (left channel, center channel, right channel, left and right side surround channels, left and right rear surround channels, left and right front overhead channels, left and right rear overhead channels and subwoofer channel speaker) in a 7.1.4 channel layout to form a three-dimensional sound field coverage.

[0097] Compared to existing technologies, traditional aftermarket car audio systems only support stereo or 5.1 surround sound formats. Their decoding modules lack the capability to decode 7.1.4 immersive sound formats, and they often employ a hardware architecture that integrates all functional modules into a single housing, resulting in limited channel expansion capabilities and an inability to meet immersive sound playback requirements. This embodiment constructs a step-by-step processing chain through a split architecture. It uses a dedicated decoding board 102 equipped with an ADI21569 chip to achieve accurate hardware decoding of immersive sound formats, combined with an independent DSP board 103 to complete multi-channel signal optimization processing, thus solving the technical bottleneck of traditional equipment's inability to support 7.1.4 channel immersive sound playback.

[0098] Through the above technical solution, this application realizes the complete decoding and playback of the 7.1.4 panoramic sound format in the automotive aftermarket modification scenario, and solves the problem of sound field flattening caused by the lack of top channel support in traditional equipment; through the collaborative work of the decoding board, DSP board and power amplifier board, the integrity of panoramic sound data is ensured in the decoding, signal optimization and power amplification process, and finally, through the vehicle sound unit matched with the sound channel, the modified vehicle audio output includes a three-dimensional immersive audio effect with vertical sound source localization.

[0099] In some embodiments, the method further includes: when a music playback application on Android board 101 identifies a non-Atmos format, it transmits the decapsulated audio data to DSP board 103.

[0100] Specifically, after the Android board 101 completes the decapsulation of the audio file, it determines the audio format type using a built-in format recognition algorithm. If the recognition result is a non-Atmos format (such as a regular stereo or surround sound format), the decapsulated PCM audio data is directly transmitted through a dedicated physical channel between the Android board 101 and the DSP board 103, bypassing the processing stage of the decoder board 102. After receiving the data, the DSP board 103 performs audio optimization processing, including adjusting the delay, gain, frequency, and amplitude of each channel, while simultaneously implementing equalization adjustment, surround sound and 3D sound effects, and noise reduction. This processing path avoids redundant decoding operations on the decoder board 102 for non-Atmos data, while retaining the DSP board 103's ability to process multi-channel audio signals.

[0101] Compared to existing technologies, traditional aftermarket car audio systems typically transmit all audio data to the decoder board 102 for processing. Even for common audio formats that do not require decoding, they force format conversion, resulting in the unused resources of the decoder board 102. This embodiment, however, establishes a direct connection between the Android board 101 and the DSP board 103, enabling dynamic selection of the audio processing path. This allows non-Dolby Atmos data to bypass the decoder board 102 and directly enter the subsequent processing stage.

[0102] Through the above technical solution, this application solves the problem of wasted hardware resources caused by the forced use of a single processing path in traditional devices, optimizes the audio processing flow for non-Atmos formats, and ensures compatibility with multiple audio formats. By reducing the data processing load on the decoder board, audio signal delay introduced by redundant decoding operations is avoided.

[0103] In some embodiments, the method further includes: receiving a volume adjustment command input by a user based on an in-vehicle control panel; receiving the volume adjustment command based on a music playback application on an Android board and sending the volume adjustment command to the DSP board 103; and adjusting the digital gain of the audio signal based on the DSP board 103 in response to the volume adjustment command.

[0104] Specifically, when a user generates a volume adjustment command by operating the vehicle's control panel, the music playback application on the Android board 101 receives the command and converts it into a control signal recognizable by the DSP board 103. Based on the received control signal, the DSP board 103 applies corresponding digital gain adjustment to the currently processed audio signal.

[0105] Compared to existing technologies, traditional aftermarket car audio systems typically use analog potentiometers or voltage divider circuits for volume control. These methods are prone to introducing noise during signal transmission, and their adjustment accuracy is limited by the potentiometer's mechanical structure. This application, however, utilizes a digital gain adjustment mechanism to directly control volume in the digital domain, eliminating analog circuit noise interference and improving adjustment accuracy. Furthermore, direct instruction connection between the Android board 101 and the DSP board 103 simplifies system design.

[0106] Through the above technical solution, this application achieves high-precision volume control through a digital gain adjustment mechanism, avoids signal degradation in the analog signal path, reduces system complexity, and improves the user's operating experience in multi-format audio playback scenarios.

[0107] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions in the examples of this application.

Claims

1. A panoramic sound decoding player for automotive aftermarket modification, characterized in that, include: The first part includes an Android board, a decoding board, and a DSP board connected in sequence by wires. The Android board is used to run a music playback application, which decapsulates audio files and identifies audio formats based on the music playback application. When the immersive sound format is identified, the decapsulated audio data is passed through to the decoding board. The decoding board is used to decode the immersive sound format audio data to obtain the decoded audio signal. The DSP board is used to perform audio processing on the decoded audio signal. The back unit, including the power amplifier board, is used to amplify the power of the processed audio signal; The front unit is provided with a first port for connecting to the vehicle control panel, and the rear unit is provided with a second port for connecting to the vehicle sound unit. The front unit and the rear unit are connected by a cable.

2. The panoramic sound decoding player according to claim 1, characterized in that, The Android board is also wired to the DSP board, and is used to pass through the decapsulated audio data to the DSP board when the music playback application on the Android board recognizes a non-Atmos format.

3. The panoramic sound decoding player according to claim 2, characterized in that, The music playback application on the Android board is also used to receive volume adjustment commands and send the volume adjustment commands to the DSP board; The DSP board is also used to adjust the digital gain of the audio signal in response to the volume adjustment command.

4. The panoramic sound decoding player according to any one of claims 1-3, characterized in that, The preamble includes a first housing, the Android board and the decoding board are stacked in a first area within the first housing, and the DSP board is stacked in a second area within the first housing; The rear assembly includes a second housing, and the power amplifier board is disposed within the second housing.

5. The panoramic sound decoding player according to claim 4, characterized in that, The decoding board uses the ADI21569 decoding chip, which supports panoramic sound decoding algorithms.

6. The panoramic sound decoding player according to claim 4, characterized in that, The cable between the front and rear sets contains at least 12 core wires for lossless transmission of the multi-channel audio signals processed by the DSP board to the power amplifier board of the rear set.

7. A car audio system aftermarket modification system, characterized in that, Includes the panoramic sound decoding player, vehicle control panel, and vehicle sound unit as described in any one of claims 1-6, wherein the layout of the vehicle sound unit matches the panoramic sound channel format; The front unit is wired to the vehicle control panel via a first port; The rear unit is wiredly connected to the vehicle-mounted sound unit via a second port.

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