Vehicle-mounted audio system

Abstract

The utility model provides a vehicle-mounted audio system. The vehicle-mounted audio system comprises an automobile host and a power amplification module, wherein a system-on-chip and an A2B main node are arranged in the automobile host; the system-on-chip is connected with the A2B main node, and a digital audio signal processor is carried on the system-on-chip; the power amplification module comprises an A2B slave node and a power amplification unit; the A2B slave node is connected with the power amplification unit; the A2B master node is connected with the A2B slave node through an A2B bus; according to the utility model, the audio control is integrated on the system-level chip side for processing, so that the dependence on the power amplification module is reduced, and the hardware selection can be reduced; by using the A2B bus to transmit the signal, the audio delay is reduced, and the complex wiring requirement in the vehicle is reduced, so that the power amplification module can be connected with more audio devices.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the industry field relates to intelligent automobile, especially relates to vehicle entertainment system, concretely is a vehicle audio system. BACKGROUND

[0002] In the past, the sound quality of the car audio system is not the focus of mainstream consumers, but at present, with the development of the intelligent trend of the automobile market, the consumer's demand for vehicle entertainment is increasing, therefore, in order to meet the user's experience pursuit of vehicle audio, the related audio equipment in the vehicle, such as loudspeaker, microphone, etc. The type and quantity will increase, and the audio source type and audio strategy will be more complex.

[0003] How to achieve appropriate sound effect in the limited space of the car, the selection of audio transmission technology directly affects the sound quality, stability and user experience of the vehicle entertainment system. At present, several audio transmission technologies are applied in the car audio system.

[0004] MOST (English full name: Media Oriented Systems Transport) as a high-speed network communication technology designed for vehicle entertainment system, provides high bandwidth, low delay, can transmit multiple audio channels and video streams at the same time, ensures the synchronization of audio in the vehicle system, also supports multiple audio devices and loudspeakers, but its shortcomings are also obvious, the hardware and wiring cost of MOST system is very high, and needs special hardware and specific interface, and the integration is relatively complex, therefore, MOST is mainly used in high-end vehicle system, and does not exist in all vehicle models.

[0005] Ethernet technology transmits audio data through standard Ethernet protocol and network, uses common AVB protocol, this technology can also provide very high bandwidth and support complex audio network architecture, but the configuration and management of Ethernet are complex, professional network management knowledge is needed, and in the case of high network load, delay problem will occur, and compared with some low-power vehicle technology, the power consumption of Ethernet transmission is higher.

[0006] A2B (English full name: Automotive Audio Bus) is to realize the transmission of audio signal through a twisted pair, because of the twisted pair wiring mode, the cost is lower and suitable for medium and low-end vehicle models, and can support longer transmission distance and low delay, and A2B can support data and power transmission at the same time, reducing the complex wiring demand in the vehicle, but A2B bus transmission depends on both hardware equipped with A2B chip.

[0007] Comparing the above several audio transmission technologies from the audio quality output, the cost of the car machine, the system complexity, A2B audio transmission technology is suitable for most of the current market vehicle models and audio system design.

[0008] So most of the current intelligent car for user audio experience, based on A2B digital audio bus technology audio architecture design, mainstream scheme has the following two kinds:

[0009] 1. Audio system scheme 1 is combined with the host and traditional power amplifier, the algorithm is placed in the power amplifier side to process, combined with Figure 1 .

[0010] Such design will reduce the host processing, not easy to make mistakes, but the traditional power amplifier hardware inside need to increase the algorithm processing related chip, at the same time, part of the audio file will be saved in the power amplifier side, also need to consider the power amplifier side of the memory storage (Flash) size, which will hinder the subsequent iteration upgrade, and the main audio processing module in the external device, will increase the audio delay, and the risk of silence.

[0011] 2. Audio system scheme 2 is to increase the digital audio processing module (English full name: Digital Signal Processor, English abbreviation: DSP) and built-in power amplifier in the entertainment host, the algorithm module is placed in the DSP side, finally the sound source after the sound effect processing is output to the built-in power amplifier for power amplification, combined with Figure 2 .

[0012] This architecture is better in subsequent update of audio source and user experience, but because it needs to integrate different scene sound, considering the DSP memory resources, also need to external memory storage to ensure resource allocation; and, considering the digital audio processing module integrated in the host, system upgrade also need to upgrade the digital audio processing module alone, will increase the risk of failure caused by the car audio silence, at the same time, the built-in power amplifier processing audio path is limited, it is difficult to achieve the market requirements of sound quality effect. Utility model content

[0013] The utility model aims at providing a kind of vehicle-mounted audio system for solving the problems indicated in the above background art.

[0014] The utility model provides a kind of vehicle-mounted audio system, the vehicle-mounted audio system includes: automobile host and power amplification module;Wherein, the automobile host is equipped with system level chip and A2B main node;The system level chip is connected with the A2B main node, and digital audio signal processor is carried on the system level chip;The power amplification module includes A2B slave node and power amplification unit;The A2B slave node is connected with the power amplification unit;The A2B main node is connected between the A2B slave node by A2B bus.

[0015] The utility model discloses, through the audio control all collection is handled in the system level chip side, reduced the dependence to power amplifier module, and still can reduce hardware selection, through using A2B bus transmission signal, reduced audio delay, reduced the complex wiring demand in vehicle, thereby make power amplifier module can connect more audio equipment.

[0016] In an implementation mode of the utility model, the A2B slave node is connected with the power amplification unit through TDM protocol.

[0017] In an implementation mode of the utility model, the digital audio signal processor is connected with the A2B master node through TDM protocol.

[0018] In an implementation mode of the utility model, the vehicle-mounted audio system further includes: a loudspeaker module; the loudspeaker module is connected with the power amplification unit.

[0019] In an implementation mode of the utility model, the audio playing in different scenes is divided into different sound source types; different sound source types correspond to different audio channels, and the master control logic corresponding to different sound source types is located in the system level chip; wherein the sound source types at least include any one or two and more than two combinations: multimedia, call, navigation, voice interaction.

[0020] As described above, the vehicle-mounted audio system has the following beneficial effects:

[0021] (1) Compared with the prior art, the utility model provides a novel vehicle-mounted audio system, which can flexibly meet increasingly complex listening requirements through optimization of the traditional vehicle-mounted audio system, can complete more audio requirements, and can also share a set of hardware devices, so that the internal wiring of the automobile is more simplified, and subsequent system iteration and upgrading are facilitated.

[0022] (2) The digital audio signal processor provided by the utility model adopts a separate processing unit, which does not affect the computing power of the CPU (English full name: Central Processing Unit) in the automobile host; if more functions are integrated, the CPU is affected, but the algorithm integrated in the digital audio signal processor is not affected too much, and the delay is the shortest for audio processing, and the experience is stronger.

[0023] (3) The power amplifier module provided by the utility model only needs to amplify the sound source data output to the subsequent loudspeaker module, and has no other software functions.

[0024] (4) In the hardware design of the utility model, the digital signal modules such as external digital audio processing and memory processor are reduced, the system level chip side resources are reused, and the vehicle machine cost is reduced.

[0025] (5)The utility model is beneficial to subsequent OTA (English full name: Over-the-Air) upgrade of the car audio system, all audio source files and audio algorithm modules are concentrated on the system chip side, the system can be updated comprehensively along with the system upgrade, and user experience is better. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The structure schematic diagram of the audio system under the first scheme in the prior art is shown.

[0027] Figure 2 The structure schematic diagram of the audio system under the second scheme in the prior art is shown.

[0028] Figure 3 The structure schematic diagram of the car audio system according to the utility model embodiment is shown.

[0029] Figure 4 The principle diagram of the car audio system according to the utility model embodiment is shown. DETAILED DESCRIPTION

[0030] The embodiments of the utility model will be described below through specific concrete examples, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the disclosure of the specification. The utility model can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the utility model in a schematic manner, and only show the components related to the utility model in the diagrams, not the number, shape and size of the components when actually implemented. The type, number and ratio of each component in actual implementation can be randomly changed, and the component layout type can also be more complex.

[0032] Reference Figures 1 to 4The following embodiments of this utility model provide an in-vehicle audio system. Compared with the prior art, this utility model provides a novel in-vehicle audio system. By optimizing the traditional in-vehicle audio system, it can flexibly meet increasingly complex listening needs. While fulfilling more audio requirements, it can also share a single hardware device, making the wiring inside the car more streamlined and facilitating subsequent system iteration and upgrades. The digital audio signal processor provided by this utility model uses a separate processing unit, which will not affect the computing power of the CPU in the car's head unit. If more functions are integrated, the CPU will be affected, but the algorithm integrated into the digital audio signal processor will not be significantly affected. Moreover, for audio processing, the latency is minimized, resulting in a better user experience. The power amplifier module provided by this utility model only needs to amplify the audio source data output to the subsequent speaker module, without any other software functions. In terms of hardware design, this utility model reduces the number of external digital audio processing and memory processors and other digital signal modules, reusing system-on-a-chip resources and reducing the cost of the in-vehicle system. This utility model facilitates subsequent OTA upgrades of the in-vehicle audio system. By concentrating all audio source files and audio algorithm modules on the system-on-a-chip side, it can be fully updated with system upgrades, resulting in a better user experience.

[0033] OTA (Over-The-Air) upgrades are a technology that uses a wireless network to remotely update device software or firmware, primarily used to improve performance, fix defects, or add new features.

[0034] The "AVB protocol" mentioned in the background section is explained as follows:

[0035] AVB, short for Audio Video Bridging, is a network transmission protocol based on the IEEE 802 standard. It aims to achieve real-time transmission of high-quality audio and video data by optimizing bandwidth, latency, and clock synchronization mechanisms. Its core objective is to provide a stable, low-latency network environment for multimedia applications, and it is especially suitable for professional audio-visual, industrial control, and other fields.

[0036] The technical solutions of the present invention will now be described in detail with reference to the accompanying drawings of the embodiments.

[0037] like Figure 3 As shown in one embodiment, the present invention provides an in-vehicle audio system, which includes: a car head unit 1 and a power amplifier module 2.

[0038] Specifically, the automobile main machine 1 is internally provided with a system chip 11 and an A2B master node 12; the system chip 11 is connected with the A2B master node 12, and a digital audio signal processor 111 is carried on the system chip 11; the power amplification module 2 comprises an A2B slave node 21 and a power amplification unit 22; the A2B slave node 21 is connected with the power amplification unit 22; the A2B master node 12 and the A2B slave node 21 are connected through an A2B bus 3.

[0039] It should be noted that the system chip, English full name: System on Chip, English abbreviation: SOC, also known as system on chip, means that it is a product, which is a dedicated target integrated circuit, which contains a complete system and all the contents of embedded software, and it is also a technology to realize the whole process from determining system function to software / hardware division and completing design.

[0040] The digital audio signal processor, English full name: Audio Digital Signal Processor, English abbreviation: aDSP, is specially designed for processing digital audio signals, and has excellent computing power and real-time processing capability.

[0041] The A2B master node 12 and the A2B slave node 21 both adopt an independent A2B chip.

[0042] It should be noted that the utility model provides a kind of vehicle-mounted audio system based on SOC digital technology and A2B audio transmission technology, the SOC (i.e. system chip 11) in automobile main machine 1 and the aDSP (i.e. digital audio signal processor 111) carried by SOC handle digital audio signal, and output to power amplification unit 22 by A2B bus.

[0043] By comparing Figure 1 , Figure 2 , Figure 3 The external power amplifier of Figure 1 Belongs to traditional power amplifier, including A2B slave node, digital audio processing module and power amplification unit; Figure 2 The power amplifier of Figure 3 The power amplifier (i.e. power amplification unit 22 in Figure 3 ) adds A2B slave node 21 on the basis of Figure 2 Power amplifier, compared with Figure 1 Power amplifier, Figure 2 And Figure 3 The power amplifier of Figure 2 Power amplifier, Figure 3The power amplifier increases the number of audio channels, can output audio data to more loudspeakers, and improves the sound quality.

[0044] In an embodiment, the A2B slave node 21 is connected with the power amplifier unit 22 through a TDM protocol.

[0045] It should be noted that TDM, the full name in English: Time Division Multiplexing, Chinese translation: time division multiplexing, is a data transmission protocol commonly used in time division multiplexing technology.

[0046] Specifically, the connection between the A2B slave node 21 and the power amplifier unit 22 is realized through a TDM interface.

[0047] In an embodiment, the digital audio signal processor 111 is connected with the A2B master node 12 through a TDM protocol.

[0048] In an embodiment, the vehicle-mounted audio system further comprises a loudspeaker module; the loudspeaker module is connected with the power amplifier unit 22.

[0049] Specifically, the digital audio is power-amplified by the power amplifier unit 22 and then drives the loudspeaker module in the corresponding orientation to produce sound.

[0050] As shown in Figure 3 and Figure 4 In an embodiment, the loudspeaker module comprises a loudspeaker 4.

[0051] Specifically, the loudspeaker 4 is connected with the power amplifier unit 22.

[0052] In an embodiment, the audio playing in different scenes is divided into different audio source types; different audio source types correspond to different audio channels, and the master control logic corresponding to different audio source types is located in the system-level chip 11.

[0053] In this embodiment, the audio source type at least includes but is not limited to any one or two or more combinations of the following: multimedia, call, navigation, voice interaction.

[0054] Specifically, as shown in Figure 4 The audio link provided by the utility model mainly consists of a car host 1, a power amplification module 2 and an audio wire harness (namely an A2B bus 3); in a vehicle-mounted audio system, the playing in different scenes is divided into different audio source types, then the master control logic of these different types of audio sources is placed on the SOC side of the car host 1, the different audio sources are processed by using the aDSP on the SOC side, finally, the audio data is output to the A2B master node 12 through a TDM protocol.

[0055] It should be noted that the A2B slave node 21 and the power amplification unit 22 are connected through the TDM protocol, and then the A2B master node 12 and the A2B slave node 21 are linked by the A2B bus 3 to achieve the communication between the automobile host 1 and the power amplification module 2. For example, the driving simulation sound wave of the new energy vehicle is directly played on the SOC side, and then the sound wave audio data is transmitted to the power amplification module 2 through the A2B port (i.e. the A2B master node 12 and the A2B slave node 21).

[0056] The vehicle-mounted audio system provided by the utility model is designed based on SOC digital technology and A2B automobile audio technology, and the whole audio architecture is designed to achieve better sound quality effect of the vehicle-mounted audio system and flexibly adapt to more and more complex audio requirements in the market.

[0057] The description of the flow or structure corresponding to each of the above-mentioned drawings has its own emphasis, and the part not described in detail in a certain flow or structure can be referred to the related description of other flows or structures.

[0058] The above-mentioned embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A vehicle-mounted audio system, characterized in that, The in-vehicle audio system includes: a car head unit and a power amplifier module; wherein... The vehicle host is equipped with a system-on-a-chip and an A2B master node; the system-on-a-chip is connected to the A2B master node, and a digital audio signal processor is mounted on the system-on-a-chip; The power amplification module includes an A2B slave node and a power amplification unit; the A2B slave node is connected to the power amplification unit. The A2B master node and the A2B slave node are connected via the A2B bus.

2. The vehicle audio system according to claim 1, characterized in that, The A2B slave node is connected to the power amplifier unit via the TDM protocol.

3. The vehicle audio system according to claim 1, characterized in that, The digital audio signal processor is connected to the A2B master node via the TDM protocol.

4. The vehicle audio system according to claim 1, characterized in that, The vehicle audio system also includes: a speaker module; The speaker module is connected to the power amplifier unit.

5. The in-vehicle audio system according to claim 1, characterized in that, Audio playback in different scenarios is categorized into different audio source types; different audio source types correspond to different audio paths, and the main control logic corresponding to different audio source types is located in the system-on-a-chip; wherein, the audio source type includes at least one or two or more of the following: multimedia, call, navigation, and voice interaction.

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