HDMI filter

Abstract

The utility model discloses an HDMI (High Definition Multimedia Interface) filter which comprises a shell, a circuit board arranged in the shell, and a first HDMI interface and a second HDMI interface which are arranged on the shell, the circuit board is provided with a filter circuit connected with the first HDMI interface and the second HDMI interface, an electricity-to-light conversion module connected with the first HDMI interface and a light-to-electricity conversion module connected with the second HDMI interface, and an optical fiber is also connected between the electricity-to-light conversion module and the light-to-electricity conversion module. According to the utility model, the transmission speed and anti-interference performance of video and audio data can be improved, and the transmission speed and quality of HDMI data can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to an HDMI filter. Background Art

[0002] HDMI (High Definition Multimedia Interface) is a fully digital video and audio transmission interface that can transmit high-definition video and audio signals, such as 4K high-definition video data transmission.

[0003] HDMI filters are used to transmit video and audio data in scenarios where shielding is required, such as transmitting HDMI data between devices inside a shielding box and devices outside the shielding box to shield interference from high-frequency signals.

[0004] Existing HDMI filters generally use conventional circuits to transmit data, which has a slow transmission speed and poor anti-interference performance.

[0005] Therefore, the prior art needs to be improved. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an HDMI filter, aiming to improve the transmission speed and anti-interference performance of video and audio data, and ensure the transmission speed and quality of HDMI data.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An HDMI filter, comprising a housing, a circuit board arranged in the housing, a first HDMI interface and a second HDMI interface arranged on the housing;

[0009] The circuit board is provided with a filter circuit connecting the first HDMI interface and the second HDMI interface, an electric-to-optical conversion module connected to the first HDMI interface, and an optical-to-electrical conversion module connected to the second HDMI interface, and an optical fiber is also connected between the electric-to-optical conversion module and the optical-to-electrical conversion module.

[0010] In some examples, the first HDMI interface and the second HDMI interface both include a power pin, a DDC channel pin, and a data transmission pin, and the filtering circuit includes a multi-channel filtering branch, and the filtering branch is connected between the power pin of the first HDMI interface and the power pin of the second HDMI interface, and between the DDC channel pin of the first HDMI interface and the DDC channel pin of the second HDMI interface;

[0011] The electrical-to-optical conversion module is connected to the data transmission pin of the first HDMI interface, and the optical-to-electrical conversion module is connected to the data transmission pin of the second HDMI interface.

[0012] In some examples, the shell includes a first shell and a second shell connected in a cover manner, a plurality of filter cavities are arranged in the first shell and / or the second shell, each of the filter branches includes a plurality of cascaded filter units, and each of the filter cavities covers a filter unit.

[0013] In some examples, a mounting groove is provided in the second shell body, the mounting groove receives the circuit board, and a waveguide hole is provided in the first shell body, the waveguide hole receives the optical fiber.

[0014] In some examples, a conductive cotton strip is further disposed in the housing and abuts against the circuit board.

[0015] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as implementation methods) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described one by one here.

[0016] The beneficial effects of the utility model are as follows: by arranging an electric-to-optical conversion module, an optical-to-electrical conversion module and an optical fiber connected between the electric-to-optical conversion module and the optical-to-electrical conversion module on the circuit board of the HDMI filter to transmit video and audio data, the optical fiber transmits data at a fast speed and is not easily interfered by electromagnetic waves, and high-frequency interference signals are filtered out during the transmission of HDMI data signals to ensure stable transmission of video and audio data, while ensuring high-speed transmission of HDMI signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the HDMI filter of the present utility model.

[0019] Figure 2 for Figure 1 Schematic cross-section of the structure.

[0020] Figure 3 The utility model is a circuit principle block diagram of the HDMI filter.

[0021] Figure 4 The figure is a circuit connection diagram of the HDMI filter of the utility model.

[0022] Figure 5 This is a schematic diagram of the interior of the first shell.

[0023] Figure 6 This is a schematic diagram of the interior of the second shell.

[0024] Description of reference numerals:

[0025] 100-filter, 10-shell, 11-first shell, 12-second shell, 13-filter cavity, 14-mounting slot, 15-waveguide hole, 16-conductive cotton strip, 17-cotton strip slot, 20-circuit board, 21-filter circuit, 211-filter branch, 22-electric-to-optical conversion module, 23-optical-to-electrical conversion module, 30-first HDMI interface, 40-second HDMI interface, 50-optical fiber, 60-mounting frame. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "electrical connection", "fixed", etc. should be understood in a broad sense. For example, "electrical connection" can be a fixed electrical connection, a detachable electrical connection, or an integrated electrical connection; it can be a mechanical electrical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0030] The specific embodiments are as follows:

[0031] Please refer to Figures 1 to 3 The utility model proposes an HDMI filter 100, comprising a housing 10, a circuit board 20 arranged in the housing 10, a first HDMI interface 30 and a second HDMI interface 40 arranged on the housing 10. In this embodiment, the first HDMI interface 30 is used to connect the source end of the HDMI signal, that is, the HDMI signal is transmitted from the source end to the first HDMI interface 30, and the second HDMI interface 40 is used to connect the receiving end of the HDMI signal, that is, the HDMI signal is output from the second HDMI interface 40 to the receiving end for playback and display, such as the receiving end can be a video and audio playback device such as a display screen. In this embodiment, the first HDMI interface 30 and the second HDMI interface 40 are respectively arranged at two opposite ends of the housing 10, so that one end of the HDMI filter 100 of this embodiment can be connected to a device in a shielding box, and the other end can be connected to a device outside the shielding box. At the same time, the HDMI filter 100 of this embodiment can also be used in a through-the-wall HDMI data transmission scenario.

[0032] In this embodiment, Figure 3 and Figure 4 As shown, the circuit board 20 is provided with a filter circuit 21 connected to the first HDMI interface 30 and the second HDMI interface 40, an electric-to-optical conversion module 22 connected to the first HDMI interface 30, and an optical-to-electrical conversion module 23 connected to the second HDMI interface 40, and an optical fiber 50 is also connected between the electric-to-optical conversion module 22 and the optical-to-electrical conversion module 23.

[0033] The filter circuit 21 filters the power signal between the first HDMI interface 30 and the second HDMI interface 40, and the filter circuit 21 can also filter the data signal transmitted between the first HDMI interface 30 and the second HDMI interface 40. The electric-to-optical conversion module 22 converts the electric signal into an optical signal, and the optical-to-electrical conversion module 23 converts the optical signal into an electric signal. The HDMI data signal needs to be first transmitted through the first HDMI interface 30 to the electric-to-optical conversion module 22 to convert the electric signal into an optical signal, and then the optical signal is transmitted to the optical-to-electrical conversion module 23 to be converted into an electric signal, and then output through the second HDMI interface 40. That is, the signal transmission of the HDMI filter 100 of this embodiment is directional, and the HDMI data signal can only be transmitted from the first HDMI interface 30 to the second HDMI interface 40. Conversely, if the signal transmission direction is from the second HDMI interface 40 to the first HDMI interface 30, the HDMI signal cannot be transmitted normally.

[0034] As an implementation mode, the electric-to-optical conversion module 22 of this embodiment includes a light-emitting diode that converts an electric signal into an optical signal, and the optical-to-electrical conversion module 23 includes a photodiode that converts an optical signal into an electric signal. The electric-to-optical conversion module 22 and the optical-to-electrical conversion module 23 of this embodiment also include an amplification circuit to amplify the signal.

[0035] The working principle of the HDMI filter 100 of the present invention is as follows:

[0036] The first HDMI interface 30 is connected to the HDMI signal source end, that is, the first HDMI interface 30 is connected to the HDMI signal output device such as the host, and the second HDMI interface 40 is connected to the HDMI signal receiving end, such as the display device. The power signal of the host is transmitted to the second HDMI interface 40 through the first HDMI interface 30, and the second HDMI interface 40 end is powered, and the filter circuit 21 filters the power signal. The host outputs HDMI data to the first HDMI interface 30, and the electrical signal is converted into an optical signal through the electrical-to-optical conversion module 22, and then transmitted to the optical-to-electrical conversion module 23 through the optical fiber 50. The optical-to-electrical conversion module 23 converts the optical signal into an electrical signal and then outputs the data from the second HDMI interface 40 to the display device. Since the HDMI data transmission process in this embodiment adopts the optical fiber 50 for transmission, the transmission speed is fast and is not interfered by high-frequency electromagnetic signals such as Bluetooth and WIFI signals. In this way, the HDMI filter 100 of the utility model can ensure that when the HDMI data is transmitted through the first HDMI interface 30 and the second HDMI interface 40, it is transmitted without interference, stably and at high speed, ensuring the speed and quality of HDMI data transmission in the shielding scene.

[0037] The first HDMI interface 30 and the second HDMI interface 40 of the HDMI filter 100 of this embodiment both include a power pin, a DDC channel pin, and a data transmission pin. Specifically, Figure 4 As shown in the figure, the first HDMI interface 30 is the HDMI1 interface, and the second HDMI interface 40 is the HDMI2 interface. Both the HDMI1 interface and the HDMI2 interface contain a +5V power pin, a DDC channel pin represented by I2C-CLK and I2C_DATA, and four groups of differential signal pins, including three groups of data pins D0-, D0+, D0_SHIELD, D1-, D1+, D1_SHIELD, and D2-, D2+, D2_SHIELD, and one group of synchronous clock pins CK-, CK+, CK_SHIELD.

[0038] The DDC (Display Data Channel) channel is used to exchange some configuration information between the HDMI transmitter and receiver. The transmitter reads the EDID data stored in the EEPROM of the receiver through the DDC channel, obtains the information of the receiver, confirms the settings and functions of the receiver terminal display, such as determining the display properties of the monitor (such as resolution, aspect ratio, etc.), and decides in what format to transmit audio and video data between the receiver and the transmitter.

[0039] In this embodiment, Figure 3 and Figure 4 As shown, the filter circuit 21 includes a multi-channel filter branch 211, and the filter branch 211 is respectively connected between the power pin of the first HDMI interface 30 and the power pin of the second HDMI interface 40, and between the DDC channel pin of the first HDMI interface 40 and the DDC channel pin of the second HDMI interface 40. The electric-to-optical conversion module 22 is connected to the data transmission pin of the first HDMI interface 30, and the optical-to-electrical conversion module 23 is connected to the data transmission pin of the second HDMI interface 40.

[0040] like Figure 4 As shown in , a filter branch 211 is connected between the power pin +5V of the first HDMI interface 30 and the power pin +5V of the second HDMI interface 40, another filter branch 211 is connected between the I2C-CLK pin of the first HDMI interface 40 and the I2C-CLK pin of the second HDMI interface 40, and another filter branch 211 is connected between the I2C_DATA pin of the first HDMI interface 40 and the I2C_DATA pin of the second HDMI interface 40, that is, in this embodiment, multiple filter branches 211 are independently connected between the power pins of the first HDMI interface 30 and the second HDMI interface 40, and between the DDC channel pins, to improve the filtering effect. Each filter branch 211 can use an LC or RLC filter circuit.

[0041] like Figure 4 As shown in the figure, the left end of the electric-to-optical conversion module 22 is connected to the CK-, CK+, D0-, D0+, D1-, D1+, D2-, D2+ data transmission pins of the first HDMI interface 30, and the right end of the electric-to-optical conversion module 22 is connected to the optical fiber 50. The left end of the optical-to-electrical conversion module 23 is connected to the optical fiber 50, and the right end of the optical-to-electrical conversion module 23 is connected to the CK-, CK+, D0-, D0+, D1-, D1+, D2-, D2+ data transmission pins of the second HDMI interface 40. The CK-, CK+, D0-, D0+, D1-, D1+, D2-, and D2+ pins of the first HDMI interface 30 are respectively connected to the CK-, CK+, D0-, D0+, D1-, D1+, D2-, and D2+ pins of the second HDMI interface 40 through the electrical-to-optical conversion module 22, the optical fiber 50, and the optical-to-electrical conversion module 23, thereby realizing the transmission of HDMI data between the first HDMI interface 30 and the second HDMI interface 40 through the optical fiber 50.

[0042] Preferably, the first HDMI interface 30 and the second HDMI interface 40 also include CEC, HEC, and HOT_PLUG_DET pins, the CEC and HEC pins are detection monitoring pins, and the HOT_PLUG_DET pin is a hot plug detection pin, and independent filtering branches 211 are respectively connected between the CEC, HEC, and HOT_PLUG_DET pins of the first HDMI interface 30 and the second HDMI interface 40 to further improve the filtering effect and enhance the anti-interference capability.

[0043] Please continue to refer to Figure 1 , Figure 2 , Figure 5 In this embodiment, the housing 10 of the HDMI filter 100 includes a first housing 11 and a second housing 12 that are connected to each other. A plurality of filter cavities 13 are disposed in the first housing 11 and / or the second housing 12. Each of the filter branches 211 includes a plurality of cascaded filter units, and each of the filter cavities 13 is covered with a filter unit. In this embodiment, the first housing 11 and the second housing 12 are pressed together and fastened by screws, and the circuit board 20 is accommodated in the space enclosed by the first housing 11 and the second housing 12.

[0044] In this embodiment, each of the filter branches 211 includes a filter unit composed of multiple LC or RC circuits cascaded together. Multiple LC or RC circuits are connected in sequence to form a cascade filter branch 211. Multiple filter units are combined to form a cascade filter effect, and multiple filter cavities 13 are combined to form a cascade cavity filter, which further improves the filter shielding effect. Figure 2 , Figure 5 and Figure 6 As shown in FIG. 1 , three groups of filter cavities 13 are correspondingly opened on both sides between the first shell 11 and the second shell 12 of this embodiment, and a three-level filtering effect is formed on each side.

[0045] Preferably, if Figure 5 and Figure 6 As shown, in this embodiment, a mounting groove 14 is provided in the second housing 12, and the mounting groove 14 receives the circuit board 20, and a waveguide hole 15 is provided in the first housing 11, and the waveguide hole 15 receives the optical fiber 50. The waveguide hole 15 allows non-metallic objects to pass through it while ensuring the shielding effect.

[0046] Furthermore, a conductive cotton strip 16 is disposed in the housing 10 and abuts against the circuit board 20. Figure 6 As shown in the figure, the second shell 12 is provided with a sliver groove 17 in the bottom wall of the mounting groove 14, and a conductive sliver 16 is installed in the sliver groove 17. Because the mounting groove 14 accommodates the circuit board 20, the circuit board 20 can abut against the conductive sliver 16 in the bottom wall of the mounting groove 14, and the conductive sliver 16 can absorb electromagnetic waves and enhance the shielding effect.

[0047] Preferably, if Figure 1 As shown in FIG. 1 , a mounting frame 60 is disposed outside the housing 10 of the HDMI filter 100 of the present invention. The mounting frame 60 facilitates the installation and connection between the HDMI filter 100 and the shielding box.

[0048] The HDMI filter 100 of the present invention transmits HDMI data through the optical fiber 50 by providing a first HDMI interface 30, a second HDMI interface 40, an electrical-to-optical conversion module 22 connected to the first HDMI interface 30, an optical-to-electrical conversion module 23 connected to the second HDMI interface 40, and an optical fiber 50 connected between the electrical-to-optical conversion module 22 and the optical-to-electrical conversion module 23, thereby ensuring the speed and quality of HDMI data transmission.

[0049] The above description is only an example to clearly illustrate the present invention, and does not limit the patent scope of the present invention. It is impossible to list all implementation methods here. All equivalent structural changes made by using the contents of the technical solution of the present invention under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An HDMI filter, characterized in that: It includes a housing, a circuit board arranged in the housing, and a first HDMI interface and a second HDMI interface arranged on the housing; The circuit board is provided with a filter circuit connecting the first HDMI interface and the second HDMI interface, an electric-to-optical conversion module connected to the first HDMI interface, and an optical-to-electrical conversion module connected to the second HDMI interface, and an optical fiber is also connected between the electric-to-optical conversion module and the optical-to-electrical conversion module.

2. The HDMI filter according to claim 1, wherein: The first HDMI interface and the second HDMI interface both include a power pin, a DDC channel pin, and a data transmission pin, and the filtering circuit includes a multi-channel filtering branch, and the filtering branch is connected between the power pin of the first HDMI interface and the power pin of the second HDMI interface, and between the DDC channel pin of the first HDMI interface and the DDC channel pin of the second HDMI interface respectively; The electrical-to-optical conversion module is connected to the data transmission pin of the first HDMI interface, and the optical-to-electrical conversion module is connected to the data transmission pin of the second HDMI interface.

3. The HDMI filter according to claim 2, wherein: The shell includes a first shell and a second shell connected to each other in a cover manner. A plurality of filter cavities are arranged in the first shell and / or the second shell. Each of the filter branches includes a plurality of cascaded filter units, and each of the filter cavities covers a filter unit.

4. The HDMI filter according to claim 3, characterized in that: The second shell is provided with a mounting groove for receiving the circuit board, and the first shell is provided with a waveguide hole for receiving the optical fiber.

5. The HDMI filter according to claim 1, wherein: A conductive cotton strip is also arranged in the housing and abuts against the circuit board.

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