Anti-rf interference sound card

Abstract

This utility model discloses an anti-radio frequency interference sound card, comprising: a shell having a receiving cavity and a first mounting sidewall, the first mounting sidewall having a first placement opening; a control circuit board disposed within the shell; an XLR interface electrically connected to the control circuit board for audio signal transmission; and a shielding cover, the shielding cover enclosing a shielding cavity, the shielding cover being disposed within the shell, the shielding cover having a first mounting opening corresponding to the first placement opening, the XLR interface being mounted within the first mounting opening with its interface end located at the first placement opening, and the other end of the XLR interface opposite to its interface end being disposed within the shielding cavity; by setting the sound card shell to have a shielding cover, the shielding cover enclosing the XLR interface, and the connection end of the XLR interface to the control circuit board being placed within the shielding cover, thereby solving the problem of audio signals being affected by radio frequency interference and affecting signal transmission stability.

Description

Technical Field

[0001] This utility model relates to a sound card, and more particularly to an anti-radio frequency interference sound card, which is applied in the field of audio equipment technology. Background Technology

[0002] In existing technologies, the microphone is connected to the terminal via electrical connections using various cables. If the terminal is a PC (Personal Computer), the connection cable between the microphone and the terminal is USB. In some usage scenarios, in order to obtain more realistic original sound, users will use an external sound card to connect the microphone. The microphone is connected to the sound card via an XLR cable, and then the USB output interface on the sound card is connected to the terminal via a USB cable for digital transmission.

[0003] To improve the aesthetics and feedback efficiency of sound cards, existing sound cards often feature RGB lighting around their control components (faders, buttons, and knobs) on the casing. When the sound card is working, the RGB lights operate at a preset frequency and cycle. However, this lighting generates significant signal radiation to the electrical signals within the casing's circuitry. When this radiation reaches the cables near the XLR connector, it can cause radio frequency interference to the transmitted audio signal, affecting signal transmission stability. Since the XLR connector transmits unprocessed, true audio, radio frequency interference can have irreversible effects on the audio signal, impacting the sound card's usability. Furthermore, external sounds, such as those from mobile phones, Wi-Fi routers, and even high-frequency radio frequency noise generated by computer CPUs / graphics cards, are received and demodulated into noise within the audio range by the sound card's high-sensitivity input circuitry (such as microphone amplifiers). When a mobile phone is brought close to the sound card, a "buzzing" pulse noise is often heard; this is radio frequency interference generated by the mobile phone while searching for a signal, significantly affecting user experience. Utility Model Content

[0004] In the aforementioned prior art, the light emitted by the lamps causes significant signal radiation to the electrical signals in the casing circuitry. When this radiation reaches the cables near the XLR interface, it can cause radio frequency interference to the transmitted audio signals, affecting signal transmission stability. Since the XLR-transmitted signal is unprocessed true sound, radio frequency interference can have irreversible effects on the audio signal, impacting the sound card's performance. This invention provides an anti-radio frequency interference sound card to solve the above problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an anti-radio frequency interference sound card, comprising: a shell having a receiving cavity and a first mounting sidewall, the first mounting sidewall having a first placement opening; a control circuit board disposed within the shell; an XLR interface electrically connected to the control circuit board for audio signal transmission; and a shielding cover, the shielding cover enclosing a shielding cavity, the shielding cover being disposed within the shell, the shielding cover having a first mounting opening, the first mounting opening corresponding to the first placement opening, the XLR interface being installed within the first mounting opening with the interface end of the XLR interface located at the first placement opening, and the other end of the XLR interface opposite to the interface end being disposed within the shielding cavity.

[0006] Furthermore, the shielding cover includes an upper shell and a lower shell, the upper shell is mounted on the lower shell, and an installation notch is formed when the upper shell is mounted on the lower shell, through which the control circuit board is mounted in the shielding cavity.

[0007] Furthermore, the lower housing has a second mounting sidewall, which is provided corresponding to the first mounting sidewall, and the first mounting opening is provided on the second mounting sidewall.

[0008] Furthermore, it also includes a phantom power switch, a second mounting opening is provided on the second mounting sidewall, a second placement opening is provided on the first mounting sidewall, the second placement opening is provided corresponding to the second mounting opening, the phantom power switch is installed in the second mounting opening and the switch end of the phantom power switch is located at the second placement opening, and the phantom power switch is electrically connected to the control circuit board.

[0009] Furthermore, it also includes a first analog interface, a third mounting opening on the second mounting sidewall, and a third placement opening on the first mounting sidewall. The third placement opening is configured to correspond to the third mounting opening. The first analog interface is installed in the third mounting opening and the interface end of the first analog interface is located at the third placement opening. The first analog interface is electrically connected to the control circuit board.

[0010] Furthermore, the lower housing and / or the upper housing are formed by bending copper foil or aluminum foil.

[0011] Furthermore, the control circuit board is fixedly mounted on the lower housing, and the upper housing is fixedly mounted on the control circuit board; when the lower housing is formed by bending copper foil or aluminum foil, the control circuit board is fixed to the lower housing by soldering.

[0012] Furthermore, it also includes a fixing component. The upper housing is provided with a locking connecting block and one or more inserts. The locking connecting block is provided with a first connecting hole. The control circuit board is provided with an insertion slot corresponding to the insert and a second connecting hole corresponding to the locking connecting block. The lower housing is provided with a corresponding slot corresponding to the insert. The insert is inserted into the insertion slot and placed in the corresponding slot. The upper housing is fixedly connected to the control circuit board through the fixing component connecting the first connecting hole and the second connecting hole.

[0013] Furthermore, it also includes multiple second analog interfaces and multiple data interfaces, all of which are mounted on the first mounting sidewall and are electrically connected to the control circuit board.

[0014] Furthermore, it also includes a power switch, which is mounted on the first mounting sidewall and electrically connected to the control circuit board.

[0015] The beneficial effects of this utility model are as follows: This utility model provides an anti-radio frequency interference sound card. The sound card has a shielding cover inside its shell, which forms a shielding cavity. The shielding cover covers the XLR interface, and the connection end of the XLR interface to the control circuit board is placed inside the shielding cover. In this way, the shielding cover can prevent the sound card light from generating a large signal radiation from the electrical signals in the circuitry inside the shell to the wires near the XLR interface, thereby solving the problem that the audio signal is affected by radio frequency interference and affects the stability of signal transmission. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of the sound card provided by this utility model;

[0017] Figure 2 This is an exploded view of the sound card provided by this utility model;

[0018] Figure 3 This is a perspective view of the shielding cover provided by this utility model;

[0019] Figure 4 This is a schematic diagram of the control circuit board mounting structure provided by this utility model;

[0020] Figure 5 This is an exploded view showing the structural relationship between the shielding cover and the control circuit board provided by this utility model.

[0021] Reference numerals: Housing - 1; First mounting sidewall - 11; Control circuit board - 2; Insert slot - 21; Second connection hole - 22; Fixing piece - 220; XLR interface - 3; Small circuit board - 30; Shielding cover - 4; Second mounting sidewall - 41; First mounting opening - 411; Second mounting opening - 412; Third mounting opening - 413; Upper housing - 42; Locking connecting block - 421; First connection hole - 4211; Insert piece - 422; Mounting notch - 44; Lower housing - 43; Corresponding slot - 431; First placement opening - 111; Second placement opening - 112; Third placement opening - 113; Phantom power switch - 5; First analog interface - 6; Second analog interface - 7; Data interface - 8; Power switch - 9; Main control board - 10; Fader - 101; Button - 102; Knob - 103. Detailed Implementation

[0022] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model 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 only used to explain this utility model and are not intended to limit this utility model.

[0023] Please see Figures 1-5 A radio frequency interference-resistant sound card, comprising:

[0024] The outer casing 1 has a first mounting sidewall 11, and the first mounting sidewall 11 is provided with a first placement opening 111;

[0025] The control circuit board 2 is disposed inside the housing 1;

[0026] XLR interface 3, electrically connected to the control circuit board 2, is used for audio signal transmission, primarily for connecting microphones; and

[0027] A shielding cover 4 is provided, which encloses a shielding cavity. The shielding cover 4 is disposed inside the outer shell 1. The shielding cover 4 has a first mounting opening 411, which corresponds to the first placement opening 111. The XLR interface 3 is installed in the first mounting opening 411, and the interface end of the XLR interface 3 is located at the first placement opening 111. The other end of the XLR interface 3 opposite to the interface end of the XLR interface 3 is disposed in the shielding cavity. In this structure, a small XLR interface circuit board 30 can also be provided. The XLR interface is disposed on the small circuit board 30 and electrically connected to the control circuit board 2. In order to facilitate the electrical connection between the small circuit board 30 and the control circuit board 2, the small circuit board 30 and the control circuit board 2 are spliced ​​together.

[0028] The above structure means that a shielding cover 4 is provided inside the sound card's outer casing 1. The shielding cover 4 forms a shielding cavity and covers the XLR interface 3. The connection end of the XLR interface 3 to the control circuit board is placed inside the shielding cover 4. In this way, the shielding cover can prevent the sound card's lights from generating large signal radiation from the electrical signals in the circuitry inside the casing to the wires near the XLR interface 3, thereby solving the problem that the audio signal is affected by radio frequency interference and affects the stability of signal transmission.

[0029] In this embodiment, the shielding cover 4 includes an upper housing 42 and a lower housing 43. The upper housing 42 is mounted on the lower housing 43, and an installation notch 44 is formed when the upper housing 42 is mounted on the lower housing 43. The control circuit board 2 is partially mounted in the shielding cavity through the installation notch 44. This structure mainly indicates that the control circuit board 2 is located between the upper housing 42 and the lower housing 43, and part of the control circuit board 2 is mounted in the shielding cavity. Therefore, the connection between the XLR interface 3 and the control circuit board 2 is inside the shielding cover 4. In other words, the shielding cover 4 blocks high-frequency radio frequency noise generated by external sources such as mobile phones, Wi-Fi routers, and even computer CPUs / graphics cards, preventing them from being received and demodulated into noise within the audio range by the high-sensitivity input circuit (such as a microphone amplifier) ​​of the sound card. Compared to when there is no shielding cover 4, when a mobile phone is brought close to the sound card, a "buzzing" pulse noise is often heard. This is radio frequency interference generated by the mobile phone when searching for a signal. In other words, with this structure, the background noise of the recording is extremely low, more sound details can be captured, the signal-to-noise ratio is greatly improved, and the user experience is enhanced. Signal-to-noise ratio (SNR) is an important indicator for measuring the relationship between useful signals and background noise. It directly affects how we perceive audio quality, and the higher the SNR value, the better. Alternatively, the upper housing 42 and the lower housing 43 can be integrally formed, with an installation notch 44 for mounting the control circuit board 2 on the shielding cover. However, this method is not convenient for the control circuit board 2 to be electrically connected to the XLR interface 3. Therefore, in this embodiment, it is preferred to use the upper housing 42 and the lower housing 43 in combination to mount the control circuit board 2.

[0030] In this embodiment, the lower housing 43 has a second mounting sidewall 41, which is provided corresponding to the first mounting sidewall 11. The first mounting opening 411 is provided on the second mounting sidewall 41. This structure is mainly to facilitate the installation of other interfaces and buttons.

[0031] In this embodiment, the anti-RF interference sound card also includes a phantom power switch 5 and a first analog interface 6. The second mounting sidewall 41 is further provided with a second mounting opening 412 and a third mounting opening 413. The first mounting sidewall 11 is further provided with a second placement opening 112 and a third placement opening 113, respectively corresponding to the second mounting opening 412 and the third placement opening 413. The phantom power switch 5 is disposed within the second mounting opening 412, and its switch terminal is located at the second placement opening 112. The first analog interface 6 is disposed within the third mounting opening 413, and its interface terminal is located at the third placement opening 113. Both the phantom power switch 5 and the first analog interface 6 are electrically connected to the control circuit board 2. In this structure, the phantom power switch 5 is mainly a DC power supply device for the XLR interface 3. The power source has voltages including 12V, 24V, and 48V. This application prefers 48V phantom power. Using 48V phantom power ensures stable and safe power supply, low interference and high fidelity signal transmission, and strong anti-interference capability. The 48V phantom power, combined with the shielding cover 4, achieves physical isolation of noise outside the shielding cover 4 and balanced transmission design, effectively reducing signal attenuation during transmission and improving the user experience. The first analog interface 6, like the phantom power switch 5 and XLR interface 3, is covered by the shielding cover 4. It is mainly for "monitoring output" to facilitate real-time sound listening. This first analog interface 6 can preferably be set as a 3.5mm interface. The 3.5mm interface is a common interface that can be used to plug in headphones without the need for additional adapters. When beginners first get started with recording / live streaming, they may only have ordinary 3.5mm headphones and a small microphone. They do not need to buy professional XLR equipment first. They can start by plugging in the 3.5mm interface to get started. It is set as a "supplementary" setting for XLR interface 3, making it convenient for users.

[0032] In this embodiment, the lower housing 43 and / or the upper housing 42 are formed by bending copper foil or aluminum foil. Preferably, both the lower housing 43 and the upper housing 42 are formed by bending copper foil or aluminum foil. Copper foil or aluminum foil can better absorb the sound card's lighting and the signal radiation generated by the electrical signals in the circuitry inside the housing, as well as external sounds. It can effectively block external electromagnetic interference, enabling the shielding cover 4 to achieve better electromagnetic shielding. Furthermore, using copper foil or aluminum foil for bending eliminates the need for complex molds and allows for flexible adjustment. When modifying the size or shape, only the bending parameters need to be adjusted, without the need to re-open the mold. After forming, the performance is stable and there is no structural damage. Because copper foil or aluminum foil is thin, it occupies less space and is lightweight, which can achieve optimal performance while making the sound card as a whole compact.

[0033] In this embodiment, the control circuit board 2 is fixedly mounted on the lower housing 43, and the upper housing 42 is fixedly mounted on the control circuit board 2, which makes the installation stable and efficient.

[0034] In this embodiment, when the lower housing 43 is formed by bending copper foil or aluminum foil, the control circuit board 2 is fixed to the lower housing 43 by soldering. When assembling the sound card, the lower housing is installed first. The specific installation steps are to first fix the lower housing to the control circuit board 2 by soldering its edge, and then glue the whole assembly to the preset position inside the sound card. The above includes, but is not limited to, fixing and connecting by soldering. However, soldering is preferred. By fixing and connecting by soldering, the grounding requirements of the lower housing can be met. In this way, the signal interference absorbed by the shielding cover 4 is conducted out by grounding.

[0035] In this embodiment, the anti-RF interference sound card also includes a fixing member 220. The upper housing 42 is provided with a locking connecting block 421 and one or more inserts 422. The locking connecting block 421 is provided with a first connecting hole 4211. The control circuit board 2 is provided with an insertion slot 21 corresponding to the insert 422 and a second connecting hole 22 corresponding to the locking connecting block 421. The insert 422 is inserted into the insertion slot 21. The upper housing 42 is fixedly connected to the control circuit board 2 through the fixing member 220 connecting the first connecting hole 4211 and the second connecting hole 22. The upper housing is connected to the lower housing through the control circuit board 2. The connection forms a shielding cavity. The main purpose of the insert 422 and the insert slot 21 is to install the upper housing 42 on the control circuit board 2. The control circuit board 2 and the upper housing 42 are fixed by locking connecting block 421, first connecting hole 4211, second connecting hole 22 and fastener 220. The first connecting hole 4211 and the second connecting hole 22 can be screw holes, and the fastener 220 is a bolt. The lower housing is provided with a corresponding insert 422 with a corresponding slot 431. The insert 422 is placed into the corresponding slot 431 through the insert slot 21 to ensure the airtightness of the shield. The insert 422 can be an insert block or an insert post.

[0036] In this embodiment, the anti-RF interference sound card also includes multiple second analog interfaces 7 and multiple data interfaces 8. The multiple second analog interfaces 7 and multiple data interfaces 8 are all installed on the first mounting sidewall 11, and the multiple second analog interfaces 7 and multiple data interfaces 8 are all electrically connected to the control circuit board 2. The second analog interfaces 7 are mainly 3.5mm interfaces. The second analog interfaces 7 and multiple data interfaces 8 are mainly to facilitate users to connect different types of external devices. The data interfaces 8 are configured as USB interfaces, Thunderbolt interfaces, MIDI interfaces, SPDIF interfaces, USB HUB interfaces, etc.

[0037] In this embodiment, the anti-radio frequency interference sound card also includes a power switch 9, which is installed on the first mounting side wall 11 and electrically connected to the control circuit board 2, and is used to control the power connection and power disconnection of the sound card.

[0038] In this embodiment, the anti-radio frequency interference sound card also includes a main control board 10. The aforementioned control circuit board 2 is electrically connected to the main control board 10. The sound card is also provided with a fader 101, a button 102, and a knob 103. The fader 101, the button 102, and the knob 103 are all electrically connected to the main control board 10.

[0039] In summary, through the structural design of the sound card's shield 4, the shield 4 can completely eliminate or greatly reduce annoying specific noises such as high-frequency radio waves generated by mobile phones, Wi-Fi routers, and even computer CPUs / graphics cards, as well as the signal interference generated by the large signal radiation of the electrical signals in the circuit of the outer casing 1 caused by light to the wires near the XLR interface 3, significantly improving the signal-to-noise ratio and enhancing the user experience.

[0040] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An anti-RF interference sound card, characterized in that, include: The housing has a receiving cavity and a first mounting sidewall, the first mounting sidewall having a first placement opening; The control circuit board is housed within the housing; The XLR interface is electrically connected to the control circuit board and is used for audio signal transmission. as well as A shielding cover is provided, which encloses a shielding cavity. The shielding cover is disposed inside the outer shell. The shielding cover has a first mounting opening, which corresponds to the first placement opening. The XLR interface is installed in the first mounting opening and the interface end of the XLR interface is located at the first placement opening. The other end of the XLR interface opposite to the interface end of the XLR interface is disposed in the shielding cavity.

2. The radio frequency interference resistant sound card of claim 1, wherein, The shielding cover includes an upper shell and a lower shell. The upper shell is mounted on the lower shell, and an installation notch is formed when the upper shell is mounted on the lower shell. The control circuit board is mounted in the shielding cavity through the installation notch.

3. The radio frequency interference resistant sound card of claim 2, wherein, The lower housing has a second mounting sidewall, which is provided corresponding to the first mounting sidewall, and the first mounting opening is provided on the second mounting sidewall.

4. The radio frequency interference resistant acoustic card of any of claims 1-3, wherein, It also includes a phantom power switch, a second mounting opening on the second mounting sidewall, and a second placement opening on the first mounting sidewall. The second placement opening is configured to correspond to the second mounting opening. The phantom power switch is installed in the second mounting opening and the switch terminal of the phantom power switch is located at the second placement opening. The phantom power switch is electrically connected to the control circuit board.

5. The radio frequency interference resistant sound card of claim 4, wherein, It also includes a first analog interface, a third mounting opening on the second mounting sidewall, and a third placement opening on the first mounting sidewall. The third placement opening is configured to correspond to the third mounting opening. The first analog interface is installed in the third mounting opening and the interface end of the first analog interface is located at the third placement opening. The first analog interface is electrically connected to the control circuit board.

6. The radio frequency interference resistant sound card of claim 2, wherein, The lower housing and / or the upper housing are formed by bending copper foil or aluminum foil.

7. The radio frequency interference resistant sound card of claim 6, wherein, The control circuit board is fixedly mounted on the lower housing, and the upper housing is fixedly mounted on the control circuit board; when the lower housing is formed by bending copper foil or aluminum foil, the control circuit board is fixed to the lower housing by soldering.

8. The radio frequency interference resistant sound card of claim 6, wherein, It also includes a fixing component. The upper housing is provided with a locking connecting block and one or more inserts. The locking connecting block is provided with a first connecting hole. The control circuit board is provided with an insertion slot corresponding to the insert and a second connecting hole corresponding to the locking connecting block. The lower housing is provided with a corresponding slot corresponding to the insert. The insert is inserted into the insertion slot and placed in the corresponding slot. The upper housing is fixedly connected to the control circuit board through the fixing component connecting the first connecting hole and the second connecting hole.

9. The anti-radio frequency interference sound card according to claim 1, characterized in that, It also includes multiple second analog interfaces and multiple data interfaces, all of which are mounted on the first mounting sidewall and are electrically connected to the control circuit board.

10. The radio frequency interference resistant sound card of claim 1, wherein, A power switch is also included, which is mounted on the first mounting side wall and electrically connected with the control circuit board.

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