Vehicle-mounted sound card box and vehicle test system

Abstract

The utility model discloses a vehicle-mounted sound card box and a vehicle test system. The vehicle-mounted sound card box comprises a housing; the MIC is arranged in the shell, at least part of the MIC is exposed out of the shell, and the MIC is used for collecting sound; the loudspeaker is arranged in the shell, at least part of the loudspeaker is exposed out of the shell, and the loudspeaker is used for playing sound; the PCBA board is arranged in the shell, the PCBA board is in interactive connection with the MIC, the output end of the PCBA board is connected to the controlled end of the loudspeaker, and the PCBA board is suitable for being connected with a computer or a cabin controller through a PCBA board connecting line; and the sound insulation assembly is arranged between the MIC and the loudspeaker. In the process of sound acquisition, transmission and broadcasting, the sound insulation assembly is arranged between the MIC and the loudspeaker, so that electromagnetic interference between the MIC and the loudspeaker can be avoided, noise is reduced, current sound is avoided, sound quality is clearer, and howling can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted equipment, in particular to a vehicle-mounted sound card box and a vehicle testing system. Background Art

[0002] Currently, when car cockpit developers are testing on actual vehicles and encounter a situation where the computer or cockpit controller does not have an independent sound card, they need external speakers and MICs to collect and play sounds in order to complete the test, find problems and solve them.

[0003] When engineers connect external speakers and MICs, the external connection operations are not uniform each time, and the anti-electromagnetic interference capability is weak, which easily causes noise and howling problems, affecting the test. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect that noise and howling are easily generated when an external speaker and MIC are connected, thereby providing a vehicle sound card box and a vehicle testing system.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A car sound card box, comprising:

[0007] case;

[0008] MIC, the MIC is arranged in the housing, at least a part of the MIC is exposed from the housing, and the MIC is used to collect sound;

[0009] A speaker, the speaker is arranged in the housing, at least a part of the speaker is exposed from the housing, and the speaker is used to play sound;

[0010] A PCBA board, wherein the PCBA board is disposed in the housing, the PCBA board is interactively connected to the MIC, the output end of the PCBA board is connected to the controlled end of the speaker, and the PCBA board is suitable for being connected to a computer or a cockpit controller through a PCBA board connection line;

[0011] A sound insulation component is arranged between the MIC and the speaker.

[0012] To further optimize the technical solution, a MIC positioning column is provided on the shell, a sound collection hole and a MIC mounting hole are provided on the MIC positioning column, and the MIC mounting hole is arranged close to the interior of the shell and communicated with the sound collection hole.

[0013] Further optimizing the technical solution, the sound insulation component includes:

[0014] A sound insulation sleeve, which is interference-fitted in the MIC mounting hole and is arranged on the periphery of the MIC;

[0015] A sealing layer is arranged between the sound insulation sleeve and the speaker to isolate the sound insulation sleeve from the speaker; a MIC circuit is connected to the MIC, and the MIC circuit passes through the sealing layer and is connected to the PCBA board.

[0016] Further optimizing the technical solution, the sound insulation sleeve is a rubber sleeve;

[0017] And / or the sealing layer is a sealant sealing layer.

[0018] To further optimize the technical solution, the shell is a split shell, and the shell includes an upper shell and a lower shell that are detachably connected to each other.

[0019] To further optimize the technical solution, the MIC positioning column is extended upwardly and arranged on the top wall of the lower shell, and a first opening adapted to the MIC positioning column is opened on the side wall of the upper shell.

[0020] To further optimize the technical solution, a second opening is provided on the top wall of the upper shell, the inner top wall of the upper shell is detachably connected to the speaker, and part of the speaker is exposed from the second opening.

[0021] To further optimize the technical solution, a pair of ribs arranged at intervals are provided on the lower shell, a PCBA board holding area is formed between the two ribs and the top wall of the lower shell, and the PCBA board is arranged in the PCBA board holding area and is detachably connected to the top wall of the lower shell.

[0022] To further optimize the technical solution, a sponge layer is provided at the bottom end of the speaker.

[0023] To further optimize the technical solution, the MIC is at least 25 mm away from the speaker.

[0024] To further optimize the technical solution, the PCBA board has a signal input circuit, which includes a chip, a first bias circuit, and a second bias circuit. The first bias circuit and the second bias circuit are used to perform differential processing on the received MIC signal and input the two processed differential signals into the chip in a differential input manner.

[0025] To further optimize the technical solution, the signal input circuit also includes a filter capacitor, and the filter capacitor is used to avoid electromagnetic interference and filter noise.

[0026] A vehicle testing system, comprising:

[0027] A vehicle-mounted sound card box, wherein the vehicle-mounted sound card box is fixed inside the vehicle body through a bracket;

[0028] A computer or a cockpit controller, wherein the computer or the cockpit controller is connected to the device under test and the vehicle-mounted sound card box respectively.

[0029] The technical solution of the utility model has the following advantages:

[0030] 1. The utility model provides a vehicle-mounted sound card box. During the process of sound collection, transmission and broadcasting, since the sound insulation component is arranged between the MIC and the speaker, electromagnetic interference between the two can be avoided, noise is reduced, current sound is avoided, the sound quality is clearer, and howling can be avoided.

[0031] 2. The utility model provides a vehicle-mounted sound card box, which is easy to assemble and has compact and reasonable arrangement of parts, so it is convenient for testers to carry it with them. It can be fixed at any position in the car through different bracket arrangements, so it is convenient for car cockpit developers to use it during actual vehicle testing.

[0032] 3. The utility model provides a vehicle-mounted sound card box, in which the MIC and the speaker are arranged in separate cavities, and isolation measures such as a sealing glue layer and foam are arranged between the MIC and the speaker, which has excellent ability to prevent voice echo and howling problems.

[0033] 4. The utility model provides a vehicle sound card box, which can effectively ensure that the sound collected by the MIC will not be transmitted to the outside world, and no sound interference will be generated between the outside world and the MIC because the sound insulation sleeve is interference-fitted in the MIC installation hole. After the MIC is installed in the MIC installation hole, it is sealed with a sealant to be isolated from the speaker, and only the wiring harness is left to be connected to the PCBA board, so that the MIC and the speaker are isolated, which can effectively ensure that there is no sound interference between the MIC and the speaker.

[0034] 5. In the vehicle-mounted sound card box provided by the utility model, the MIC is at least 25 mm away from the speaker, and the arrangement position of the MIC and the speaker effectively avoids the generation of howling.

[0035] 6. In the vehicle sound card box provided by the utility model, a sponge layer is arranged at the bottom of the speaker, and the arranged sponge layer can achieve the purpose of isolating the MIC from the speaker.

[0036] 7. The utility model provides a vehicle sound card box, the PCBA board has a signal input circuit, the first bias circuit and the second bias circuit are used to perform differential processing on the received MIC signal, and the two processed differential signals are input to the chip in a differential input mode to reduce interference.

[0037] The PCBA board adds filter capacitors to avoid electromagnetic interference and filter noise, avoiding the generation of current sound.

[0038] 8. The utility model provides a car sound card box, the chip supports automatic gain control, making the sound quality clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the first-person perspective structure of a vehicle-mounted sound card box provided by the utility model;

[0041] Figure 2 A schematic diagram of the structure of a vehicle-mounted sound card box from a second viewing angle provided by the utility model;

[0042] Figure 3 An exploded diagram of a vehicle-mounted sound card box provided by the utility model;

[0043] Figure 4 A circuit diagram of a signal input circuit on a PCBA board of a vehicle-mounted sound card box provided by the utility model;

[0044] Figure 5 The utility model provides a schematic diagram of the chip of a vehicle-mounted sound card box performing automatic gain control.

[0045] Reference numerals:

[0046] 1. Upper shell, 11. First opening, 12. Second opening, 2. Speaker, 21. Speaker positioning block, 3. PCBA board, 4. MIC, 5. Lower shell, 51. MIC positioning column, 52. Sound collection hole, 53. Rib position, 6. USB wiring harness, 7. USB plug. DETAILED DESCRIPTION

[0047] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] In the description of the present invention, it should be noted that the terms "lower", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] At present, when car cockpit developers are testing on real vehicles, if the computer or cockpit controller does not have an independent sound card, they need external speakers and MICs to collect and play sounds to complete the test, find problems and solve them. However, when engineers connect external speakers and MICs, since the external operation is not uniform each time, the anti-electromagnetic interference ability is weak, which easily generates noise and howling problems, affecting the test.

[0052] In order to solve the above technical problems, the utility model designs an integrated sound card box with an integrated circuit noise reduction design to avoid electromagnetic interference and filter noise, avoid the generation of current sound, make the sound quality clearer, and isolate the MIC and the speaker well through the shell to avoid the generation of howling. It can also be fixed at any position in the car through different bracket arrangements, and has the advantages of being light and convenient and can be carried around.

[0053] The specific embodiments of the present invention are described in detail below in conjunction with the vehicle-mounted sound card box of the first aspect of the present invention.

[0054] It should be noted that the vehicle-mounted sound card box of the first aspect of the utility model is only a preferred embodiment of the utility model. The vehicle-mounted sound card box of the utility model can adopt the structure of the vehicle-mounted sound card box of the first aspect of the utility model, and can also adopt other structures. For the convenience of explanation, the specific embodiment of the utility model is explained below through the vehicle-mounted sound card box of the first aspect of the utility model.

[0055] like Figures 1 to 5 As shown, this embodiment discloses a vehicle-mounted sound card box, including a shell, a MIC 4, a speaker 2, a PCBA board 3 and a sound insulation component.

[0056] Among them, MIC4 is arranged in the shell, at least part of MIC4 is exposed from the shell, and MIC4 is used to collect sound. Speaker 2 is arranged in the shell, at least part of speaker 2 is exposed from the shell, and speaker 2 is used to play sound. PCBA board 3 is arranged in the shell, PCBA board 3 is interactively connected with MIC4, the output end of PCBA board 3 is connected to the controlled end of speaker 2, and PCBA board 3 is suitable for connecting with a computer or a cockpit controller through a PCBA board connection line.

[0057] In this embodiment, after the computer or cockpit controller issues a sound collection instruction, the sound collection instruction is transmitted to MIC4 through the PCBA board, MIC4 collects external sound information, converts the analog signal into a digital signal through the PCBA board and outputs it to the speaker 2, and the speaker 2 broadcasts the sound information. During the sound collection, transmission and broadcasting process, since the sound insulation component is arranged between MIC4 and the speaker 2, electromagnetic interference between the two can be avoided, noise is reduced, current sound is avoided, the sound quality is clearer, and howling can be avoided.

[0058] Among them, "current sound" refers to the sound of a very weak electrical signal being amplified due to the irregular thermal motion of electrons in components; "howling" refers to a sharp and long sound.

[0059] In some embodiments, a MIC positioning column 51 is provided on the side of the housing, a sound collection hole 52 and a MIC mounting hole are provided on the MIC positioning column 51, and the MIC mounting hole is arranged close to the inside of the housing and communicates with the sound collection hole 52. In this embodiment, the MIC is positioned in the MIC mounting hole, the MIC is located on the side of the housing, and the MIC collects external sound through the sound collection hole 52.

[0060] The PCBA board connection line is a USB harness 6, which is located opposite the MIC installation position. The end of the USB harness 6 is connected to a USB plug 7, which can be externally connected to a laptop computer or a cockpit controller.

[0061] In some embodiments, the sound insulation component includes a sound insulation sleeve and a sealing layer. The sound insulation sleeve is interference fit in the MIC mounting hole, and the sound insulation sleeve is arranged on the periphery of MIC4. The sealing layer is arranged between the sound insulation sleeve and the speaker 2 to isolate the sound insulation sleeve from the speaker 2; a MIC circuit is connected to the MIC4, and the MIC circuit passes through the sealing layer and is connected to the PCBA board 3. In this embodiment, because the sound insulation sleeve is interference fit in the MIC mounting hole, and then the sound insulation sleeve and the inner wall of the MIC mounting hole are sealed, it can effectively ensure that the sound collected by the MIC will not be transmitted to the outside world, and no sound interference will be generated between the outside world and the MIC. After the MIC is installed in the MIC mounting hole, it is sealed with a sealant to isolate it from the speaker, leaving only the wiring harness connected to the PCBA board, so that the MIC and the speaker 2 are also isolated, which can effectively ensure that there is no sound interference between the MIC and the speaker 2.

[0062] In some embodiments, the sound insulation sleeve is a rubber sleeve, which has sound insulation and expansion properties, and can better isolate the MIC. The sealing layer is a sealant sealing layer, and similarly, the sealant sealing layer has sound insulation and expansion properties, and can better isolate the MIC.

[0063] In some embodiments, the housing is a split housing, and the housing can be easily disassembled. The housing includes an upper housing 1 and a lower housing 5 that are detachably connected, and the upper housing 1 and the lower housing 5 are connected by screws. More specifically, the upper and lower housings are assembled by four M3X8 or M3X6 self-tapping screws.

[0064] In some embodiments, the MIC positioning column 51 extends upward and is disposed on the top wall of the lower shell 5, and a first opening 11 adapted to the MIC positioning column 51 is provided on the side wall of the upper shell 1. In this embodiment, when the upper shell 1 and the lower shell 5 are buckled together, the MIC positioning column 51 is exposed from the first opening 11, and the sound is collected by the sound collection hole 52 on the MIC positioning column 51.

[0065] In some embodiments, the speaker is arranged above the sound card box, and a second opening 12 is provided at a corresponding position of the upper shell, and the inner top wall of the upper shell 1 is detachably connected to the speaker 2, and part of the speaker 2 is exposed from the second opening 12. In this embodiment, a speaker positioning block 21 is provided on the side wall of the speaker 2, and the speaker positioning block is locked with the inner top wall of the upper shell 1 by screws, and after the speaker 2 is locked and positioned, the speaker part of the speaker 2 is exposed from the upper shell 1, which is conducive to playing sound.

[0066] In some embodiments, a pair of ribs 53 are arranged at intervals on the lower shell 5, and a PCBA board holding area is formed between the two ribs 53 and the top wall of the lower shell 5. The PCBA board 3 is arranged in the PCBA board holding area and is detachably connected to the top wall of the lower shell 5. In this embodiment, a fixed PCBA board holding area is provided on the housing, so that the PCBA board 3 can be installed in the PCBA board holding area very stably. The PCBA board is assembled on the lower shell, limited by the ribs around the lower shell, and fixed by glue.

[0067] In some embodiments, a sponge layer is provided at the bottom of the speaker 2, and the provided sponge layer can be used to isolate the MIC from the speaker 2. More specifically, a sponge 3M-TF2300 is attached to the back of the speaker to reduce the impact on the MIC of the lower shell when it contacts the lower shell.

[0068] In some embodiments, the MIC 4 is at least 25 mm away from the speaker 2 to avoid howling.

[0069] In some embodiments, the PCBA board 3 has a signal input circuit. The signal input circuit includes a chip, a first bias circuit, and a second bias circuit. The first bias circuit and the second bias circuit are used to perform differential processing on the received MIC signal, and input the two processed differential signals to the chip in a differential input mode to reduce interference. Figure 4 As shown, MIC_FL_P is a first MIC signal input terminal, MIC_FL_N is a second MIC signal input terminal, and the difference between the two input terminals is used as a signal.

[0070] Among them, MIC bias voltage refers to the DC voltage that needs to be added in order to stabilize the working point of the microphone in the capacitive microphone. This DC voltage is the bias voltage. Differential input is a signal processing technology that is mainly used to improve the accuracy of the signal and remove common error interference. In differential input, the system uses the voltage difference between the two input terminals to generate a signal.

[0071] In some embodiments, the signal input circuit further includes a filter capacitor, which is used to avoid electromagnetic interference, filter noise, and reduce the generation of current sound.

[0072] In some embodiments, the chip supports automatic gain control to make the sound quality clearer. The chip is used to automatically adjust the gain by adjusting programmable parameters and / or noise thresholds when the MIC input signal strength changes, so that the MIC output signal remains within the optimal input range of the receiving device. AGC can be used to maintain a nominally constant output level for recording voice. Instead of manually setting the channel gain in AGC mode, the circuit adjusts the gain of the channel when the input signal becomes too loud or very weak, such as when a person speaking into the microphone moves closer or farther away from the microphone. The AGC algorithm has several programmable parameters, including the target level, the maximum gain allowed, the attack and release (or decay) time constants, and the noise threshold that allows the algorithm to be fine-tuned for any specific application. Adjustment of the AGC gain factor is achieved by controlling the feedback circuit. Such as Figure 5 As shown, when the input signal strength is too weak, the AGC circuit will automatically increase the gain factor to improve the signal strength; when the input signal strength is too strong, the AGC circuit will automatically reduce the gain factor to avoid signal overload and distortion.

[0073] The above-mentioned car sound card box is relatively simple to assemble: the PCBA board is assembled on the lower shell, limited by the ribs around the lower shell, and fixed by glue; the MIC is assembled in the mounting hole of the lower shell; the speaker is positioned in the middle of the upper and lower shells, and the upper and lower shells are assembled by self-tapping screws.

[0074] When the above-mentioned vehicle sound card box is actually used, a bracket can be connected to the outside of the shell, and it can be fixed at any position in the car through different bracket arrangements, which is convenient for car cockpit developers to use during actual vehicle testing. When it is necessary to play sound, the operator controls the computer or cockpit controller to issue a sound collection instruction, and controls the MIC power supply circuit to power the MIC. After receiving the sound collection instruction, the MIC collects external sound and converts it into an analog signal. The analog signal is processed by the PCBA board 3 and converted into a digital signal. In this process, the circuit uses differential input to reduce interference and filter out noise through a filter capacitor; finally, the PCBA board 3 transmits the processed signal to the speaker 2, and the speaker 2 plays the sound. The operator completes the actual vehicle test based on the sound information.

[0075] The specific embodiments of the present invention are described in detail below in conjunction with the vehicle testing system of the second aspect of the present invention.

[0076] It should be noted that the vehicle testing system of the second aspect of the present invention is only a preferred embodiment of the present invention. The vehicle testing system of the present invention may adopt the structure of the vehicle testing system of the second aspect of the present invention or other structures.

[0077] This embodiment discloses a vehicle testing system, including a computer or a cockpit controller and a vehicle sound card box, the vehicle sound card box is fixed inside the vehicle body through a bracket, and the computer or the cockpit controller is connected to the device under test and the vehicle sound card box respectively. When testing the device under test, the computer or the cockpit controller controls the MIC in the vehicle sound card box to collect sound, and then plays the sound through the speaker 2.

[0078] It should be noted that the vehicle in the present invention may refer to a large car, a small car, a special-purpose car, etc. For example, according to the type of vehicle, the vehicle in the present invention may be a sedan, an off-road vehicle, a multi-purpose vehicle (MPV) or other vehicle types. Generally, a vehicle is provided with wheels, a power source, and a transmission system provided between the wheels and the power source. The transmission system can transmit the power provided by the power source to the wheels, so that the wheels rotate, thereby driving the vehicle to travel.

[0079] It should be noted that in the embodiments of the present utility model, the type of the power source of the vehicle is not limited. For example, for a fuel vehicle, the power source may refer to a fuel engine such as a gasoline engine or a diesel engine; for an electric vehicle, the power source may refer to an electric motor; for a hybrid vehicle, the power source may refer to an engine or an electric motor; for a vehicle powered by other means, the power source may refer to a device that generates power.

[0080] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A car sound card box, characterized in that: include: case; MIC (4), the MIC (4) is arranged in the housing, at least a part of the MIC (4) is exposed from the housing, and the MIC (4) is used to collect sound; A loudspeaker (2), the loudspeaker (2) being arranged in the housing, with at least a portion of the loudspeaker (2) protruding from the housing, and the loudspeaker (2) being used to play sound; A PCBA board (3), the PCBA board (3) being arranged in the housing, the PCBA board (3) being interconnected with the MIC (4), the output end of the PCBA board (3) being connected to the controlled end of the speaker (2), and the PCBA board (3) being suitable for being connected to a computer or a cockpit controller via a PCBA board connection line; A sound insulation component is arranged between the MIC (4) and the speaker (2).

2. The vehicle-mounted sound card box according to claim 1, characterized in that: The shell is provided with a MIC positioning column (51), and the MIC positioning column (51) is provided with a sound collection hole (52) and a MIC installation hole, wherein the MIC installation hole is arranged close to the inside of the shell and is in communication with the sound collection hole (52).

3. The vehicle-mounted sound card box according to claim 2, characterized in that: The sound insulation assembly comprises: A sound insulation sleeve, the sound insulation sleeve is interference-fitted in the MIC mounting hole, and the sound insulation sleeve is arranged on the periphery of the MIC (4); A sealing layer is arranged between the sound insulation sleeve and the loudspeaker (2) to isolate the sound insulation sleeve from the loudspeaker (2); a MIC circuit is connected to the MIC (4), and the MIC circuit passes through the sealing layer and is connected to the PCBA board (3).

4. The vehicle-mounted sound card box according to claim 3, characterized in that: The sound insulation sleeve is a rubber sleeve; and / or The sealing layer is a sealant sealing layer.

5. The vehicle-mounted sound card box according to any one of claims 2 to 4, characterized in that: The housing is a split housing, comprising an upper housing (1) and a lower housing (5) which are detachably connected to each other.

6. The vehicle-mounted sound card box according to claim 5, characterized in that: The MIC positioning column (51) extends upward and is arranged on the top wall of the lower shell (5), and a first opening (11) adapted to the MIC positioning column (51) is opened on the side wall of the upper shell (1); and / or A second opening (12) is provided on the top wall of the upper shell (1); the inner top wall of the upper shell (1) is detachably connected to the speaker (2); a portion of the speaker (2) is exposed from the second opening (12); and / or The lower shell (5) is provided with a pair of ribs (53) arranged at intervals, a PCBA board storage area is formed between the two ribs (53) and the top wall of the lower shell (5), and the PCBA board (3) is arranged in the PCBA board storage area and is detachably connected to the top wall of the lower shell (5).

7. The vehicle-mounted sound card box according to any one of claims 1 to 4, characterized in that: A sponge layer is provided at the bottom end of the loudspeaker (2); and / or The MIC (4) is at least 25 mm away from the speaker (2).

8. The vehicle-mounted sound card box according to any one of claims 1 to 4, characterized in that: The PCBA board (3) has a signal input circuit, which includes a chip, a first bias circuit, and a second bias circuit. The first bias circuit and the second bias circuit are used to perform differential processing on the received MIC signal and input the two processed differential signals into the chip in a differential input manner.

9. The vehicle-mounted sound card box according to claim 8, characterized in that: The signal input circuit also includes a filter capacitor, which is used to avoid electromagnetic interference and filter noise.

10. A vehicle testing system, characterized in that: include: The vehicle-mounted sound card box according to any one of claims 1 to 9, wherein the vehicle-mounted sound card box is fixed inside the vehicle body by a bracket; A computer or a cockpit controller, wherein the computer or the cockpit controller is connected to the device under test and the vehicle-mounted sound card box respectively.

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