Vehicle terminal audio direct output and external power amplifier switching control device and compatible switching method

Abstract

The application discloses a kind of vehicle terminal audio direct output and external power amplifier switching control device, comprising: one multiplexing analog high-definition television audio switch U1, two multiplexing analog high-definition television audio switch U3, one audio power amplifier U2, two audio power amplifier U4, 4-way operational amplifier U5, one audio switch K1, two audio switch K2 and control chip;It is also disclosed that corresponding method is configured to write configuration word into vehicle terminal according to vehicle configuration;Read the configuration word written in vehicle terminal;According to configuration word, the flow of audio signal is transferred between the different pins of U1, U2, U3, U4 and U5, and the switching switch of audio is selected;In the early stage of design, this scheme does not increase additional cost, and is economically feasible;It will not cause re-determination of the existence of external power amplifier every time when starting due to CAN bus loss;It reduces the risk of burning loudspeaker and improves user experience.

Description

Technical Field

[0001] This invention belongs to the field of vehicle terminal audio design, specifically relating to a method for direct audio output from a vehicle terminal that is compatible with external independent power amplifiers. Background Technology

[0002] As vehicles become increasingly intelligent, the huge demand for infotainment and navigation systems is driving the rapid development of the in-vehicle display market. Initially, in-vehicle multimedia systems were primarily designed for entertainment and leisure. The head unit is the core of the in-vehicle audio-visual system, its main function being to play audio sources, much like a DVD player in a home theater. However, to better suit the limited space inside vehicles, head units often have built-in amplifier capabilities. If the speaker requirements aren't too high, an external amplifier isn't necessary, allowing for a simpler audio-visual system setup. Furthermore, many head units also include a display screen, meaning a dedicated screen. With such head units, only speakers need to be connected to create an audio-visual system. The head unit is usually placed on the vehicle's control panel for easy access and operation by the driver. In the entire in-vehicle audio system, the head unit, as the final signal source, can be considered the most basic and crucial component.

[0003] The main unit's functions include: 1. Tone adjustment: unifying and coordinating signals across different frequency ranges (high, mid, and low) to make them more harmonious. 2. Loudness adjustment: supplementing signals with insufficient loudness to make the sound fuller. 3. Built-in equalizer: setting different frequency gain for different music styles. For example, selecting the "ROCK" mode will enhance bass and treble to emphasize the rock feel.

[0004] Currently, automakers equip the same model with different audio systems to meet the needs of different users. One type is a standard speaker system, and the other is a system using a separate amplifier and speakers. Existing in-vehicle terminals need to be designed separately for each audio configuration, increasing the development and production costs for both in-vehicle terminal suppliers and automakers.

[0005] On the other hand, in existing technologies, vehicle CAN bus signals can be lost. If the CAN bus signal to the external amplifier is lost, the vehicle will be judged as having no external amplifier. However, if an external amplifier is actually present, the drive power will be excessive, posing a risk of burning out the speakers. Secondly, the signal output from the built-in amplifier is amplified again by the external amplifier, which doubles the noise floor, resulting in a very poor user experience. Summary of the Invention

[0006] The technical problem this invention aims to solve is that existing vehicle terminals require separate product designs for different audio configurations, which increases the development and production costs for vehicle terminal suppliers and vehicle manufacturers; in addition, the CAN bus signal in the existing technology is prone to signal loss, which poses a risk of burning out the speakers and results in a very poor user experience.

[0007] The practice of automakers designing different audio systems for the same model and installing different head units for different configurations results in excessively high management costs in the manufacturing process.

[0008] In response to the above-mentioned shortcomings or improvement needs of existing technologies;

[0009] A vehicle-mounted terminal audio direct output and external power amplifier switching control device, comprising:

[0010] Multiplexed analog HDTV audio switch U1, multiplexed analog HDTV audio switch U3, audio power amplifier U2, audio power amplifier U4, one 4-channel operational amplifier U5, audio switch K1, audio switch K2, and control chip:

[0011] The positive terminal of the left pre-audio input signal is connected to pin 4 of U1, the negative terminal of the left pre-audio input signal is connected to pin 5 of U1, the positive terminal of the right pre-audio input signal is connected to pin 6 of U1, the positive terminal of the right pre-audio input signal is connected to pin 7 of U1, and the pin of the MCU control switch is connected to pins 1 and 15 of U1. The positive terminal of the left post-audio input signal is connected to pin 4 of U2, the negative terminal of the left post-audio input signal is connected to pin 5 of U2, the positive terminal of the right post-audio input signal is connected to pin 6 of U2, the negative terminal of the right post-audio input signal is connected to pin 7 of U2, and the pin of the MCU control switch is connected to pins 1 and 15 of U2.

[0012] Pin 2 of U1 is connected to pin 14 of U2, pin 11 of U1 is connected to pin 3 of U2, pins 5 and 14 of U1 are connected to pin 8 of U2, pin 2 of U3 is connected to pin 14 of U4, pin 11 of U3 is connected to pin 3 of U4, pins 5 and 14 of U3 are connected to pin 8 of U4, pin 3 of U1 is connected to pin 1 of U5, pin 5 of U1 is connected to pin 2 of U5, pin 10 of U1 is connected to pin 3 of U5, pin 13 of U1 is connected to pin 4 of U5, pin 3 of U3 is connected to pin 5 of U5, pin 5 of U3 is connected to pin 6 of U5, pin 10 of U3 is connected to pin 7 of U5, and pin 13 of U3 is connected to pin 8 of U5.

[0013] Pin 11 of U3 and pin 11 of U5 are connected to the positive terminal of the left front speaker, and pin 9 of U3 and pin 12 of U5 are connected to the negative terminal of the left front speaker, forming the circuit of the left front speaker.

[0014] Pin 6 of U3 and pin 13 of U5 are connected to the positive terminal of the left front speaker, and pin 9 of U3 and pin 14 of U5 are connected to the negative terminal of the right front speaker, forming the circuit of the right front speaker.

[0015] Pin 11 of U4 and pin 15 of U5 are connected to the positive terminal of the left rear speaker, and pin 9 of U4 and pin 16 of U5 are connected to the negative terminal of the left rear speaker, forming the circuit of the left rear speaker.

[0016] Pin 6 of U4 and pin 17 of U5 are connected to the positive terminal of the right rear speaker, and pin 9 of U3 and pin 18 of U5 are connected to the negative terminal of the right rear speaker, forming the circuit of the right rear speaker.

[0017] Other points on U1: Pin 8 is connected to the audio common ground; Pin 16 is connected to the 5V power supply.

[0018] U2 other points: Pin 8 is connected to the audio common ground; Pin 16 is connected to the 5V power supply;

[0019] Other points on U3: Pin 10 is connected to the audio common ground; Pins 7 and 12 are connected to the 24V power supply.

[0020] U4 other points: Pin 10 is connected to the audio common ground; Pins 7 and 12 are connected to the 24V power supply;

[0021] Other points on U5: Pin 9 is connected to the audio common ground; Pin 10 is connected to the 24V power supply.

[0022] As another aspect of the present invention, a method for direct audio output from an in-vehicle terminal and compatibility with an external independent power amplifier is also provided, comprising:

[0023] Step S1: Write the configuration words to the vehicle terminal according to the vehicle model configuration;

[0024] Step S2: Read the configuration words written in the vehicle terminal;

[0025] Step S3: Based on the configuration word, select the audio switching switch by controlling the flow of audio signals between different pins U1, U2, U3, U4, and U5.

[0026] Furthermore, the specific method of step S1 is as follows: define a DID (DID means DataID, i.e., data class ID) in the vehicle terminal, and define its Value as follows: 0x 01 - external power amplifier; 0x 00 - built-in power amplifier; when distinguishing vehicle models, use Service 2E + DID + Value (Service 2E is the controller's write service) to write its configuration.

[0027] Furthermore, the specific method for step S2 is as follows:

[0028] The variable instruction DID is read, the variable name is translated from the DID database, the variable name addresses the memory content of the ECU, and the value is assigned to the UDS diagnostic variable. The network layer is then resolved. The detailed steps are as follows:

[0029] Define a data structure as follows:

[0030]

[0031]

[0032] The DID, SA security level, length of data to be read, defined trigger function, and defined result function are encapsulated in a structure. The structure is then encapsulated into an array. The size of the array is the number of DIDs in the 0x22 function of the terminal. This is a structure array that stores data related to multiple DIDs.

[0033] After the vehicle ECU is powered on, the lower-level software loads the driver and reads the configuration items in the DID array. Based on whether the vehicle model is a high-end or low-end model, the configuration is read and written into the bootloader. After restarting, the system will drive the audio switching switch according to the configured settings.

[0034] Furthermore, the specific method of step S3 is as follows: four audio channels are input to U1 and U3 respectively, and audio output selection and switching are performed. The audio output is output to the power amplifier or operational amplifier respectively. After the vehicle terminal is configured with the vehicle model and restarted, the vehicle MCU inputs a signal to NET_EN. The high-end model inputs a high-level signal 1, and the low-end model inputs a low-level signal 0.

[0035] The NET_EN signal is the enable switch selection. When EN is 1, the audio output is turned off. When EN is 0, one of the outputs is output. The output route is selected by IN. When IN is 0, output A is output. That is, the audio signal is input from pins 4, 7, 9, and 12 of U1 and U3, then from pins 2, 11, and 12 of U1 and U3 to pins 14, 3, and 8 of U2 and U4, and then directly driven to the output interfaces 1, 2, 3, and 4 through pins 11, 6, and 9 of U2 and U4 to the speaker.

[0036] IN=1 means output B, that is, the audio signal is input from pins 4, 7, 9, 12 of U1 and U3, and then output from pins 3, 6, 10, 13 of U1 and U3 to pins 1, 2, 3, 4, 5, 6, 7, 8 of the U5 operational amplifier. Then, it goes through pins 11, 12, 13, 14, 15, 16, 17, 18 of U5 to the interface of outputs 1, 2, 3, 4 to the external independent power amplifier.

[0037] Furthermore, the control chip is ADG794BRQZ-REEL7. Since one ADG794BRQZ-REEL7 chip can only input and output two signals, two chips are needed for processing.

[0038] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0039] (1) The vehicle terminal audio direct output and external independent power amplifier compatibility method of the present invention provides a compatible design on the vehicle terminal. The vehicle manufacturer only needs one part for different vehicle models to be installed. The audio solution of the vehicle model can be realized by configuration. The adoption of this solution in the early stage of design does not increase the additional cost and is economical and feasible.

[0040] (2) The vehicle terminal audio direct output and external independent power amplifier compatibility method of the present invention, since the configuration items are already fixed, will not cause the external power amplifier to be re-determined every time it is started due to the loss of CAN bus; it reduces the risk of burning out the speaker and improves the user experience. Attached Figure Description

[0041] Figure 1 This is a structural diagram illustrating the audio switching control principle of a preferred embodiment of the present invention.

[0042] Figure 2 This is a block diagram of an audio switching control according to a preferred embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the control flow of a preferred embodiment of the present invention; Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Please see Figure 1-2 A vehicle-mounted terminal audio direct output and external power amplifier switching control device, comprising:

[0046] Multiplexed analog HDTV audio switch U1, multiplexed analog HDTV audio switch U3, audio power amplifier U2, audio power amplifier U4, one 4-channel operational amplifier U5, audio switch K1, audio switch K2, and control chip:

[0047] The positive terminal of the left pre-audio input signal is connected to pin 4 of U1, the negative terminal of the left pre-audio input signal is connected to pin 5 of U1, the positive terminal of the right pre-audio input signal is connected to pin 6 of U1, the positive terminal of the right pre-audio input signal is connected to pin 7 of U1, and the pin of the MCU control switch is connected to pins 1 and 15 of U1. The positive terminal of the left post-audio input signal is connected to pin 4 of U2, the negative terminal of the left post-audio input signal is connected to pin 5 of U2, the positive terminal of the right post-audio input signal is connected to pin 6 of U2, the negative terminal of the right post-audio input signal is connected to pin 7 of U2, and the pin of the MCU control switch is connected to pins 1 and 15 of U2.

[0048] Pin 2 of U1 is connected to pin 14 of U2 (representing the positive terminal of the left front signal); pin 11 of U1 is connected to pin 3 of U2 (representing the positive terminal of the right front signal); pins 5 and 14 of U1 are connected to pin 8 of U2 (representing the common negative terminal of the left front and right front signals); pin 2 of U3 is connected to pin 14 of U4 (representing the positive terminal of the left rear signal); pin 11 of U3 is connected to pin 3 of U4 (representing the positive terminal of the right rear signal); pins 5 and 14 of U3 are connected to pin 8 of U4 (representing the common negative terminal of the left rear and right rear signals); pin 3 of U1 is connected to pin 1 of U5. (Representing the positive terminal of the left front signal), pin 5 of U1 is connected to pin 2 of U5 (representing the negative terminal of the left front signal), pin 10 of U1 is connected to pin 3 of U5 (representing the positive terminal of the right front signal), pin 13 of U1 is connected to pin 4 of U5 (representing the positive terminal of the right front signal), pin 3 of U3 is connected to pin 5 of U5 (representing the positive terminal of the left rear signal), pin 5 of U3 is connected to pin 6 of U5 (representing the negative terminal of the left rear signal), pin 10 of U3 is connected to pin 7 of U5 (representing the positive terminal of the right rear signal), pin 13 of U3 is connected to pin 8 of U5 (representing the positive terminal of the right rear signal).

[0049] Pin 11 of U3 and pin 11 of U5 are connected to the positive terminal of the left front speaker, and pin 9 of U3 and pin 12 of U5 are connected to the negative terminal of the left front speaker, forming the circuit of the left front speaker.

[0050] Pin 6 of U3 and pin 13 of U5 are connected to the positive terminal of the left front speaker, and pin 9 of U3 and pin 14 of U5 are connected to the negative terminal of the right front speaker, forming the circuit of the right front speaker.

[0051] Pin 11 of U4 and pin 15 of U5 are connected to the positive terminal of the left rear speaker, and pin 9 of U4 and pin 16 of U5 are connected to the negative terminal of the left rear speaker, forming the circuit of the left rear speaker.

[0052] Pin 6 of U4 and pin 17 of U5 are connected to the positive terminal of the right rear speaker, and pin 9 of U3 and pin 18 of U5 are connected to the negative terminal of the right rear speaker, forming the circuit of the right rear speaker.

[0053] Other points on U1: Pin 8 is connected to the audio common ground; Pin 16 is connected to the 5V power supply.

[0054] U2 other points: Pin 8 is connected to the audio common ground; Pin 16 is connected to the 5V power supply;

[0055] Other points on U3: Pin 10 is connected to the audio common ground; Pins 7 and 12 are connected to the 24V power supply.

[0056] U4 other points: Pin 10 is connected to the audio common ground; Pins 7 and 12 are connected to the 24V power supply;

[0057] Other points on U5: Pin 9 is connected to the audio common ground; Pin 10 is connected to the 24V power supply.

[0058] Please refer to Figures 2-3 Accordingly, this solution also involves a method for direct audio output from an in-vehicle terminal that is compatible with external independent power amplifiers, including:

[0059] Step S1: Write the configuration words to the vehicle terminal according to the vehicle model configuration;

[0060] Step S2: Read the configuration words written in the vehicle terminal;

[0061] Step S3: Based on the configuration word, select the audio switching switch by controlling the flow of audio signals between different pins U1, U2, U3, U4, and U5.

[0062] The specific method of step S1 is as follows: Define a DID (DID means Data ID, i.e., data class ID) in the vehicle terminal, and define its Value as follows: 0x 01 - external power amplifier; 0x 00 - built-in power amplifier; when distinguishing vehicle models, use Service 2E + DID + Value (Service 2E is the controller's write service) to write its configuration.

[0063] The specific method for step S2 is as follows:

[0064] The variable instruction DID is read, the variable name is translated from the DID database, the variable name addresses the memory content of the ECU, and the value is assigned to the UDS diagnostic variable. The network layer is then resolved. The detailed steps are as follows:

[0065] Define a data structure as follows:

[0066]

[0067] The DID, SA security level, length of data to be read, defined trigger function, and defined result function are encapsulated in a structure. The structure is then encapsulated into an array. The size of the array is the number of DIDs in the 0x22 function of the terminal. This is a structure array that stores data related to multiple DIDs.

[0068] After the vehicle ECU is powered on, the lower-level software loads the driver and reads the configuration items in the DID array. Based on whether the vehicle model is a high-end or low-end model, the configuration is read and written into the bootloader. After restarting, the system will drive the audio switching switch according to the configured settings.

[0069] The specific method of step S3 is as follows: four audio channels are input to U1 and U3 respectively, and audio output selection and switching are performed. The output is sent to the power amplifier or operational amplifier respectively. After the vehicle terminal is configured with the vehicle model and restarted, the vehicle MCU inputs a signal to NET_EN. The high-end model inputs a high-level signal 1 and the low-end model inputs a low-level signal 0.

[0070] The NET_EN signal is the enable switch selection. When EN is 1, the audio output is turned off. When EN is 0, one of the outputs is output. The output route is selected by IN. When IN is 0, output A is output. That is, the audio signal is input from pins 4, 7, 9, and 12 of U1 and U3, then from pins 2, 11, and 12 of U1 and U3 to pins 14, 3, and 8 of U2 and U4, and then directly driven to the output interfaces 1, 2, 3, and 4 through pins 11, 6, and 9 of U2 and U4 to the speaker.

[0071] IN=1 means output B, that is, the audio signal is input from pins 4, 7, 9, 12 of U1 and U3, and then output from pins 3, 6, 10, 13 of U1 and U3 to pins 1, 2, 3, 4, 5, 6, 7, 8 of the U5 operational amplifier. Then, it goes through pins 11, 12, 13, 14, 15, 16, 17, 18 of U5 to the interface of outputs 1, 2, 3, 4 to the external independent power amplifier.

[0072] The control chip is ADG794BRQZ-REEL7. Since one ADG794BRQZ-REEL7 chip can only input and output two signals, two chips are needed for processing.

[0073] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for compatible direct audio output and external independent power amplifier in a vehicle terminal, characterized in that, include: Step S1: Write the configuration words to the vehicle terminal according to the vehicle model configuration; Step S2: Read the configuration words written in the vehicle terminal; Step S3: Based on the configuration word, select the audio switching switch by controlling the flow of audio signals between different pins U1, U2, U3, U4, and U5; The above method involves a vehicle terminal audio direct output and external power amplifier switching control device, including: Multiplexed analog HDTV audio switch U1, multiplexed analog HDTV audio switch U3, audio amplifier U2, audio amplifier U4, one 4-channel operational amplifier U5, audio switch K1, audio switch K2, and control chip: U1 and U3 are model ADG794BRQZ-REEL7; U2 and U4 are model TDA7576B. The positive terminal of the left pre-audio signal is connected to pin 4 of U1, the negative terminal of the left pre-audio signal is connected to pin 7 of U1, the positive terminal of the right pre-audio signal is connected to pin 9 of U1, the positive terminal of the right pre-audio signal is connected to pin 12 of U1, the pin of audio switch K1 is connected to pins 1 and 15 of U1, the positive terminal of the left post-audio signal is connected to pin 4 of U2, the negative terminal of the left post-audio signal is connected to pin 7 of U2, the positive terminal of the right post-audio signal is connected to pin 9 of U2, the negative terminal of the right post-audio signal is connected to pin 12 of U2, and the pin of audio switch K2 is connected to pins 1 and 15 of U2. Pin 2 of U1 is connected to pin 14 of U2; pin 11 of U1 is connected to pin 3 of U2; pins 5 and 14 of U1 are connected to pin 8 of U2; pin 2 of U3 is connected to pin 14 of U4; pin 11 of U3 is connected to pin 3 of U4; pins 5 and 14 of U3 are connected to pins 8 of U4. 8 are connected; pin 3 of U1 is connected to pin 1 of U5; pin 6 of U1 is connected to pin 2 of U5; pin 10 of U1 is connected to pin 3 of U5; pin 13 of U1 is connected to pin 4 of U5; pin 3 of U3 is connected to pin 5 of U5; pin 6 of U3 is connected to pin 6 of U5; pin 10 of U3 is connected to pin 7 of U5; pin 13 of U3 is connected to pin 8 of U5. Pin 11 of U3 and pin 11 of U5 are connected to the positive terminal of the left front speaker, and pin 9 of U3 and pin 12 of U5 are connected to the negative terminal of the left front speaker, forming the circuit of the left front speaker. Pin 6 of U3 and pin 13 of U5 are connected to the positive terminal of the right front speaker, and pin 9 of U3 and pin 14 of U5 are connected to the negative terminal of the right front speaker, forming the circuit of the right front speaker. Pin 11 of U4 and pin 15 of U5 are connected to the positive terminal of the left rear speaker, and pin 9 of U4 and pin 16 of U5 are connected to the negative terminal of the left rear speaker, forming the circuit of the left rear speaker. Pin 6 of U4 and pin 17 of U5 are connected to the positive terminal of the right rear speaker, and pin 9 of U4 and pin 18 of U5 are connected to the negative terminal of the right rear speaker, forming the circuit of the right rear speaker. U1 Other points: Pin 8 is connected to the audio common ground; Pin 16 is connected to the 5V power supply; Other points on U3: Pin 8 is connected to the audio common ground; Pin 16 is connected to the 5V power supply; U2 Other points: Pin 10 is connected to the audio common ground; Pins 7 and 12 are connected to the 24V power supply; U4 Other points: Pin 10 is connected to the audio common ground; Pins 7 and 12 are connected to the 24V power supply; U5 Other points: Pin 9 is connected to the audio common ground; Pin 10 is connected to the 24V power supply; The specific method for step S1 is as follows: Define a DID in the vehicle terminal, and define its Value as follows: 0x01—external power amplifier; 0x00—internal power amplifier; when distinguishing vehicle models, Use Service 2E + DID + Value to write its configuration; The specific method of step S3 is as follows: Four audio channels are input to U1 and U3 respectively, and audio output selection and switching are performed, outputting to either a power amplifier or an operational amplifier respectively. The vehicle terminal is equipped with... After setting the vehicle model and restarting, the vehicle MCU inputs a signal to NET_EN. High-end models input a high-level signal 1, while low-end models input a low-level signal 0. The NET_EN signal is the enable switch selection. When EN is 1, the audio output is turned off. When EN is 0, one of the outputs is output. The output route is selected by IN. When IN is 0, output A is output. That is, the audio signal is input from pins 4, 7, 9, and 12 of U1 and U3, then from pins 2, 5, 11, and 14 of U1 and U3 to pins 14, 3, and 8 of U2 and U4, and then directly driven to the output interfaces 1, 2, 3, and 4 through pins 11, 6, and 9 of U2 and U4 to the speaker. IN being 1 indicates output B, meaning the audio signal is input from pins 4, 7, 9, and 12 of U1 and U3, and then output from pins 3, 6, 10, and 13 of U1 and U3 to pins 1, 2, 3, 4, 5, 6, 7, and 8 of the U5 operational amplifier. The signal then passes through pins 11, 12, 13, 14, 15, 16, 17, and 18 of U5 to the output interfaces 1, 2, 3, and 4, which then connect to an external independent power amplifier.

2. The method for compatible direct audio output and external independent power amplifier of a vehicle terminal according to claim 1, characterized in that, The specific method for step S2 is as follows: The variable instruction DID is read, the variable name is translated from the DID database, the variable name addresses the memory content of the ECU, and the value is assigned to the UDS diagnostic variable. The network layer resolves the data. The detailed steps are as follows: Define a data structure as follows: typedef struct { uint16 uwCalReqPid; uint8 ucSaLevel; uint8 ucLength; pCalReadCallfunpCallTrigFun; pCalReadCallfunpCallResultFun; }ST_CAL_READ_CONFIG_PARAMETER; The DID, SA security level, length of data to be read, defined trigger function, and defined result function are encapsulated in a structure. The structure is then encapsulated into an array. The size of the array is the number of DIDs in the 0x22 function in the terminal. This is a structure array that stores data related to multiple DIDs. After the vehicle ECU is powered on, the lower-level software loads the driver, reads the configuration items in the DID array, and writes the configuration to the bootloader based on whether the vehicle model is a high-end or low-end model. In the BootLoader, upon restarting, the system will drive the audio switching switch according to the configured settings.

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