HDMI Fiber Optic Extender for Long-distance Data Transmission

Abstract

The present invention relates to the technical field of HDMI fiber optic extenders, and specifically provides an HDMI fiber optic extender capable of realizing long-distance data transmission, including a transmitting end and a receiving end; the transmitting end includes an HDMI input interface, a first HDMI output interface, a distribution chip, a first optoelectronic engine module and a first SWDM module; the distribution chip is respectively connected to the HDMI input interface, the first HDMI output interface and the first optoelectronic engine module, and the first optoelectronic engine module is connected to the first SWDM module; the receiving end includes a second SWDM module, a second optoelectronic engine module, an amplification chip and a second HDMI output interface; the second SWDM module is connected to the first SWDM module through an optical fiber; the second SWDM module is connected to the second optoelectronic engine module, and the amplification chip is respectively connected to the second optoelectronic engine module and the second HDMI output interface. The HDMI fiber optic extender of the present invention is no longer limited by short distances in terms of usage conditions and can realize long-distance data transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of HDMI fiber optic extenders, and particularly to an HDMI fiber optic extender capable of achieving long-distance data transmission. Background Art

[0002] HDMI fiber optic extenders can solve the limitations in cable transmission distance and quality. Ordinary cables generally have a short transmission distance, and multiple cables are required to transmit signals simultaneously. At the same time, during long-distance transmission, there are always problems such as poor transmission signals, susceptibility to interference, and phenomena such as blurred, trailing, and color separation in the displayed images, which cannot meet the requirements of long-distance transmission. If a fiber optic extender is used, an effect of a transmission distance of not less than 150 m can be achieved. Moreover, due to the characteristics of the fiber itself, fiber optic extenders are not easily interfered by the outside world and have high signal stability, so they have incomparable advantages in the field of long-distance transmission.

[0003] Currently, common HDMI fiber optic extenders are not only inconvenient to use and difficult to maintain during plugging and unplugging, but also traditional HDMI fiber optic extenders generally adopt a point-to-point method (one set of HDMI extenders for one output device), resulting in a relatively high cost. Therefore, it is necessary to provide an HDMI fiber optic extender to solve the defects existing in the prior art HDMI fiber optic extenders. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an HDMI fiber optic extender capable of achieving long-distance data transmission, including a transmitting end and a receiving end;

[0005] The transmitting end includes an HDMI input interface, a first HDMI output interface, a distribution chip, a first optoelectronic engine module, and a first SWDM module; the distribution chip is respectively connected to the HDMI input interface, the first HDMI output interface, and the first optoelectronic engine module, and the first optoelectronic engine module is connected to the first SWDM module;

[0006] The receiving end includes a second SWDM module, a second optoelectronic engine module, an amplification chip, and a second HDMI output interface; the second SWDM module is connected to the first SWDM module through an optical fiber; the second SWDM module is connected to the second optoelectronic engine module, and the amplification chip is respectively connected to the second optoelectronic engine module and the first HDMI output interface.

[0007] Optionally, the input signal of the HDMI input interface is an HDMI signal, which is divided into two signals by a distribution chip. The first signal uses wavelength division multiplexing technology to transmit four groups of high-speed differential signals to the first optoelectronic conversion engine module. The first optoelectronic conversion engine module converts the four groups of high-speed differential signals into OM3 optical signals, and the OM3 optical signals are output through the first SWDM module and the optical fiber. The second signal is output through the first HDMI output interface.

[0008] The second SWDM module receives the OM3 optical signal transmitted by the optical fiber and transmits it to the second optoelectronic conversion engine module. The second optoelectronic conversion engine module converts the OM3 optical signal into four groups of high-speed differential signals, and the four groups of high-speed differential signals are restored to HDMI signals by an amplification chip and output through the second HDMI output interface.

[0009] Optionally, both the sending end and the receiving end are configured with power supplies for power supply.

[0010] Optionally, the distribution chip adopts MS9332. The distribution chip is configured with multiple first HDMI output interfaces, and each first HDMI output interface is connected to a third device. The amplification chip adopts PI3HDMI336, and the amplification chip is connected to a second device through the first HDMI output interface.

[0011] Optionally, the HDMI input interface is connected to a first device, and the first device is one of a monitoring camera, a DVD player, a notebook, and a camera.

[0012] Both the second device and the third device are at least one of a television, a display screen, and a projector.

[0013] Optionally, the HDMI input interface and the first HDMI output interface are of the same type but cannot be inserted into each other reversely. The HDMI input interface and the second HDMI output interface are also of the same type but cannot be inserted into each other reversely.

[0014] Optionally, the HDMI input interface, the first HDMI output interface, the distribution chip, the first optoelectronic engine module, and the first SWDM module are integrated on the sending main board.

[0015] The second SWDM module, the second optoelectronic engine module, the amplification chip, and the second HDMI output interface are integrated on the receiving main board.

[0016] Optionally, both the sending main board and the receiving main board are configured with a housing, and the housing includes an upper cover and a lower cover.

[0017] The lower cover is provided with a receiving space for accommodating a transmitting main board or a receiving main board, two slots for cooperating with LC locking members, and a DC power jack; after the upper cover is mated with the lower cover, two optical ports are formed, and the two slots and the DC power jack are arranged at one end of the upper cover;

[0018] On one side of the lower cover adjacent to the DC power jack, a screw hole is provided. On the other side of the lower cover, screw holes are respectively provided near two bottom corners. At the positions corresponding to the screw holes of the lower cover on the upper cover, screw holes are provided. After the upper cover and the lower cover are mated, they are fixedly connected by screws;

[0019] At the positions of the screw holes corresponding to the transmitting main board or the receiving main board on the lower cover, studs are provided, and at the positions corresponding to the circular stud avoidance holes of the transmitting main board or the receiving main board on the upper cover, circular limiting posts are provided;

[0020] On one side of the upper cover of the transmitting end adjacent to the DC power socket, two empty slots are provided, and the two empty slots are respectively used for accommodating an LED indicator light and a MODE key;

[0021] The transmitting main board and the receiving main board are respectively provided with a first carrier board and a second carrier board. The first carrier board is provided with a first optical-electric conversion engine and a first SWDM module, and the second carrier board is provided with a second optical-electric conversion engine and a second SWDM module; the optical ports of the first SWDM module and the second SWDM module are aligned with the LC locking members to achieve quick plugging and unplugging.

[0022] Optionally, the distribution chip includes an input channel and a plurality of output channels, and the input channel is connected to the plurality of output channels through a branching circuit; the branching circuit is in a tree structure: two or more branch lines are formed by branching from a main input line, and the branch lines are further branched to form two or more sub-branch lines, and the branching times are determined according to the number of output channels; the main input line is connected to the input channel, and the ends of the branched branch lines after branching are connected to the output channels;

[0023] The distribution chip further includes a channel monitoring module and a distribution management module. The channel monitoring module is used for monitoring the external device conditions of the input channel and the output channels; the distribution management module is used for calculating and adjusting the output signal strength of each output channel according to the external device conditions.

[0024] Optionally, the amplification chip is provided with a differential amplification circuit, and the differential amplification circuit includes a differential amplification module U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, and an operational amplifier U2;

[0025] Pin 3 and Pin 2 of the differential amplifier module U1 are input terminals; Pin 1 of the differential amplifier module U1 is grounded; Pin 4 of the differential amplifier module U1 is connected to the cathode of the first capacitor C1 and connected to -15V voltage, and the anode of the first capacitor C1 is grounded; Pin 7 of the differential amplifier module U1 is connected to the anode of the second capacitor C2 and connected to +15V voltage, and the cathode of the second capacitor C2 is grounded, and Pin 8 of the differential amplifier module U1 is left floating; Pins 5 and 6 of the differential amplifier module U1 are connected to the anode of the third capacitor C3, and the cathode of the third capacitor C3 is connected to one end of the first resistor R1 and the input terminal Pin 3 of the operational amplifier U2, and the other end of the first resistor R1 is grounded;

[0026] The input terminal Pin 2 of the operational amplifier U2 is connected to one end of the second resistor R2 and one end of the third resistor R3, and the other end of the second resistor R2 is grounded; Pin 7 of the operational amplifier U2 is connected to the anode of the fourth capacitor C4 and connected to +15V voltage, and the cathode of the fourth capacitor C4 is grounded; Pin 4 of the operational amplifier U2 is connected to the cathode of the fifth capacitor C5 and connected to -15V voltage, and the anode of the fifth capacitor C5 is grounded; Pin 6 of the operational amplifier U2 is connected to the other end of the third resistor R3 and serves as the output terminal.

[0027] The HDMI optical fiber extender capable of realizing long-distance data transmission according to the present invention, its HDMI input interface at the sending end is used to connect to the first device to obtain or transmit the HDMI signal from the first device; the first HDMI output interface is used to connect to other devices to output the HDMI signal; the first optoelectronic engine module is used to convert the received HDMI signal into an optical signal; the second optoelectronic engine module at the receiving end is used to convert the received optical signal into an HDMI signal, and the second HDMI output interface is also used to connect to other devices to output the HDMI signal; between the first optoelectronic engine module and the second optoelectronic engine module, the first SWDM module and the second SWDM module are respectively used to connect the optical fiber to transmit the optical signal through the optical fiber; wherein, HDMI is the High Definition Multimedia Interface; SWDM is the short-wave wavelength division multiplexing technology, which draws on the wavelength division multiplexing (WDM) technology of single-mode optical fibers and can expand the wavelength range used during transmission; the present invention can realize short-distance transmission of HDMI signals, and can also make the usage conditions of the HDMI optical fiber extender no longer restricted by short distances and can realize long-distance data transmission; therefore, the usage conditions of the HDMI optical fiber extender of the present invention are no longer restricted by short distances and can realize long-distance data transmission.

[0028] Other features and advantages of the present invention will be described in the following specification, and in part will become apparent from the specification, or will be understood by practicing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structure specifically pointed out in the written specification, claims, and drawings.

[0029] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0030] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0031] Figure 1 Schematic diagram of an HDMI fiber optic extender capable of realizing long-distance data transmission in an embodiment of the present invention;

[0032] Figure 2 Schematic diagram of the transmitting end of an embodiment of the HDMI fiber optic extender capable of realizing long-distance data transmission of the present invention;

[0033] Figure 3 Schematic diagram of the receiving end of an embodiment of the HDMI fiber optic extender capable of realizing long-distance data transmission of the present invention;

[0034] Figure 4 Schematic diagram of the receiving end of an embodiment of the HDMI fiber optic extender capable of realizing long-distance data transmission of the present invention;

[0035] Figure 5 Stereoscopic schematic diagram of an embodiment of the HDMI fiber optic extender capable of realizing long-distance data transmission of the present invention;

[0036] Figure 6 Schematic diagram of the differential amplifier circuit adopted by the amplified chip in an embodiment of the HDMI fiber optic extender capable of realizing long-distance data transmission of the present invention. Detailed Embodiments

[0037] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0038] As Figure 1 shown, an embodiment of the present invention provides an HDMI fiber optic extender capable of realizing long-distance data transmission, including a transmitting end and a receiving end;

[0039] The transmitting end includes an HDMI input interface, a first HDMI output interface, a distribution chip, a first optoelectronic engine module, and a first SWDM module; the distribution chip is respectively connected to the HDMI input interface, the first HDMI output interface, and the first optoelectronic engine module, and the first optoelectronic engine module is connected to the first SWDM module;

[0040] The receiving end includes a second SWDM module, a second optoelectronic engine module, an amplification chip, and a second HDMI output interface; the second SWDM module is connected to the first SWDM module through an optical fiber; the second SWDM module is connected to the second optoelectronic engine module, and the amplification chip is respectively connected to the second optoelectronic engine module and the first HDMI output interface.

[0041] The working principle and beneficial effects of the above technical solution are as follows: In this solution, the HDMI input interface of the transmitting end is used to connect to the first device to obtain or transmit the HDMI signal from the first device; the first HDMI output interface is used to connect to other devices to output the HDMI signal; the first optoelectronic engine module is used to convert the received HDMI signal into an optical signal; the second optoelectronic engine module of the receiving end is used to convert the received optical signal into an HDMI signal, and the second HDMI output interface is also used to connect to other devices to output the HDMI signal; between the first optoelectronic engine module and the second optoelectronic engine module, the first SWDM module and the second SWDM module are respectively used to connect the optical fiber to transmit the optical signal through the optical fiber; among them, HDMI is the High Definition Multimedia Interface; SWDM is the Short Wavelength Division Multiplexing technology, which draws on the Wavelength Division Multiplexing (WDM) technology of single-mode optical fibers and can expand the wavelength range used during transmission; the present invention can realize the short-distance transmission of HDMI signals, and can also make the usage conditions of the HDMI optical fiber extender no longer restricted by short distances, and can realize long-distance data transmission; therefore, the usage conditions of the HDMI optical fiber extender of the present invention are no longer restricted by short distances and can realize long-distance data transmission.

[0042] In one embodiment, as Figure 1 shown, the input signal of the HDMI input interface is an HDMI signal, which is divided into two paths of signals by the distribution chip. The first path of signal uses the wavelength division multiplexing technology to transmit four groups of high-speed differential signals to the first optoelectronic conversion engine module, and the first optoelectronic conversion engine module converts the four groups of high-speed differential signals into OM3 optical signals, and the OM3 optical signals are output through the first SWDM module and the optical fiber; the second path of signal is output through the first HDMI output interface.

[0043] The second SWDM module receives the OM3 optical signal transmitted by the optical fiber and transmits it to the second optoelectronic conversion engine module. The second optoelectronic conversion engine module converts the OM3 optical signal into four groups of high-speed differential signals. The four groups of high-speed differential signals are restored to HDMI signals by the amplification chip and output through the second HDMI output interface.

[0044] The working principle and beneficial effects of the above technical solution are as follows: The first HDMI output interface in this solution can be connected to and transmit the HDMI signal to the third device, and the first HDMI output interface and the third device are connected by an HDMI cable; the second HDMI output interface can be connected to and transmit the HDMI signal to the second device, and the second HDMI output interface and the second device are connected by an HDMI cable; a distribution chip is used for signal splitting at the sending end, and each split signal carries complete input information. In the case of connecting multiple devices, each device can obtain complete information; when performing signal splitting, an amplification circuit can also be used to enhance the signal to prevent the signal strength of the split sub-signals from being reduced due to splitting and reduce the probability of signal distortion; an amplification chip is provided at the receiving end to make up for the loss in signal transmission, ensure the signal strength at the receiving end and improve the fidelity; through optoelectronic signal conversion, optical signals are transmitted through optical fibers, which can improve the signal transmission efficiency and reduce the transmission loss.

[0045] In one embodiment, as Figure 4 shown, both the sending end and the receiving end are configured with a power supply for power supply;

[0046] As Figure 2 shown, the distribution chip can adopt MS9332. The distribution chip can be configured with multiple first HDMI output interfaces, and each first HDMI output interface is connected to a third device;

[0047] The HDMI input interface is connected to the first device, and the first device can be a surveillance camera, a DVD player, a notebook or a video camera;

[0048] As Figure 3 shown, the amplification chip can adopt PI3HDMI336. The first HDMI output interface is connected to the second device, and multiple second devices can be connected;

[0049] Both the second device and the third device can be a television, a display screen or a projector; there can be multiple second devices and / or third devices;

[0050] The HDMI input interface and the first HDMI output interface can be of the same type but cannot be inserted into each other reversely, and the HDMI input interface and the second HDMI output interface can also be of the same type but cannot be inserted into each other reversely.

[0051] The working principle and beneficial effects of the above technical solution are as follows: The HDMI input interface in this solution and the first HDMI output interface, as well as the HDMI input interface and the second HDMI output interface, all use the same type of interfaces that cannot be inserted reversely, which can prevent incorrect plugging between the signal input device (the first device) and the output devices (the second device and the third device); The distribution chip uses MS9332 and the amplification chip uses PI3HDMI336. These two chips have low cost and small volume, which helps to control costs and achieve miniaturization and portability.

[0052] In one embodiment, as Figure 5 shown, the HDMI input interface, the first HDMI output interface, the distribution chip, the first optical engine module, and the first SWDM module of the sending end 1 are integrated on the sending main board 11;

[0053] The second SWDM module, the second optical engine module, the amplification chip, and the second HDMI output interface of the receiving end 2 are integrated on the receiving main board 21;

[0054] The first SWDM module and the second SWDM module are connected by an optical fiber 3.

[0055] The working principle and beneficial effects of the above technical solution are as follows: Both the sending end and the receiving end of this solution respectively adopt integrated main boards, making the structure more compact, which can further reduce the size and make the product portable; Adopting integrated main boards is conducive to the standardization of production and can further reduce the manufacturing cost; Through the cooperation of optical and electrical signal conversion, and using optical signals to be transmitted through optical fibers, the signal transmission efficiency can be improved and the transmission loss can be reduced.

[0056] In one embodiment, as Figure 5 shown, both the sending main board 11 and the receiving main board 21 are configured with a housing 4, and the housing 4 includes an upper cover and a lower cover;

[0057] The lower cover is provided with a receiving space for accommodating the sending main board or the receiving main board, two slots for cooperating with the LC locking member, and a DC power jack; After the upper cover and the lower cover are combined, two optical ports are formed, and the two slots and the DC power jack are arranged at one end of the upper cover;

[0058] A screw hole is provided on one side of the lower cover adjacent to the DC power jack, and screw holes are respectively provided on the other side of the lower cover adjacent to the two bottom corners. Screw holes are provided at the corresponding positions of the upper cover for the screw holes of the lower cover. After the upper cover and the lower cover are combined, they are fixedly connected by screws;

[0059] Screw posts are provided at the positions of the lower cover corresponding to the screw holes of the sending main board or the receiving main board, and circular limiting posts are provided at the positions of the upper cover corresponding to the circular screw post avoidance holes of the sending main board or the receiving main board;

[0060] On one side of the upper cover of the transmitting end near the DC power socket, there are two empty slots, which are respectively used to accommodate the LED indicator and the MODE key; the DC power jack is connected to the DC power supply through the power terminal 5;

[0061] The transmitting main board and the receiving main board are respectively provided with a first carrier board and a second carrier board. The first carrier board is provided with a first optical - electrical conversion engine and a first SWDM module, and the second carrier board is provided with a second optical - electrical conversion engine and a second SWDM module; the optical ports of the first SWDM module and the second SWDM module are aligned with the LC locking parts to achieve quick plug - in.

[0062] The working principle and beneficial effects of the above - mentioned technical solution are as follows: In this solution, by configuring a housing and installing the functional modules of the transmitting end and the receiving end in the housing, it can protect the functional modules of the transmitting end and the receiving end from external forces or the external environment, and improve the service life of the fiber optic extender; by setting the LED indicator, the working state can be reflected through the light signal, and by setting the MODE key, simple manual control operations can be conveniently performed; the housing is divided into an upper cover and a lower cover and assembled by bolts, which is convenient for the loading and unloading of the main board; the screw - locking structure is adopted to ensure that the upper and lower covers do not loosen and the main board does not shift when plugging and unplugging the HDMI cable and the LC plug, ensuring the high reliability of product use. The direction of the DC plug is the same as that of the LC fiber optic plug, which is convenient for plugging, maintenance, and cable management; the optical - electrical conversion engine module and the SWDM module are modularized through the carrier board, which can improve the positioning accuracy and the laser coupling accuracy, and independent processes can be carried out on the carrier board, enabling the main board COB process and the coupling process on the carrier board to be carried out independently and simultaneously, which is conducive to improving the production efficiency of mass production.

[0063] In one embodiment, the distribution chip includes an input channel and multiple output channels, and the input channel is connected to the multiple output channels through a branching circuit; the branching circuit is in a tree - like structure: the main input line branches into more than two branch lines, and the branch lines further branch into more than two sub - branch lines, and the number of branching times is determined according to the number of output channels; the main input line is connected to the input channel, and the ends of the branched branch lines are connected to the output channels;

[0064] The distribution chip further includes a channel monitoring module and a distribution management module. The channel monitoring module is used to monitor the external device conditions of the input channel and the output channels; the distribution management module is used to calculate and adjust the output signal intensity of each output channel according to the external device conditions.

[0065] The working principle and beneficial effects of the above technical solution are as follows: In this solution, an input channel and an output channel are provided in the distribution chip, and a forked circuit in a tree structure is used to connect the input channel and multiple output channels, which can ensure the uniformity and intensity of signal distribution for each branch, enhancing the reliability of the branch; by setting up a channel monitoring module to monitor the external devices connected to the input channel and output channel, and cooperating with the distribution management module to calculate and adjust the output signal intensity of each output channel according to the external device conditions, a quantitative and precise control of signal shunting is achieved, which can further ensure the fidelity and reliability of the shunted signal.

[0066] In one embodiment, as Figure 6 shown, the amplification chip is provided with a differential amplification circuit, and the differential amplification circuit includes a differential amplification module U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, and an operational amplifier U2;

[0067] The pins 3 and 2 of the differential amplification module U1 are input terminals; the pin 1 of the differential amplification module U1 is grounded; the pin 4 of the differential amplification module U1 is connected to the cathode of the first capacitor C1 and connected to -15V voltage, and the anode of the first capacitor C1 is grounded; the pins 7 of the differential amplification module U1 and the anode of the second capacitor C2 are connected and connected to +15V voltage, the cathode of the second capacitor C2 is grounded, and the pin 8 of the differential amplification module U1 is left floating; the pins 5 and 6 of the differential amplification module U1 are connected to the anode of the third capacitor C3, and the cathode of the third capacitor C3 is connected to one end of the first resistor R1 and the input terminal pin 3 of the operational amplifier U2, and the other end of the first resistor R1 is grounded;

[0068] The input terminal pin 2 of the operational amplifier U2 is connected to one end of the second resistor R2 and one end of the third resistor R3, and the other end of the second resistor R2 is grounded; the pin 7 of the operational amplifier U2 is connected to the anode of the fourth capacitor C4 and connected to +15V voltage, and the cathode of the fourth capacitor C4 is grounded; the pin 4 of the operational amplifier U2 is connected to the cathode of the fifth capacitor C5 and connected to -15V voltage, and the anode of the fifth capacitor C5 is grounded; the pin 6 of the operational amplifier U2 is connected to the other end of the third resistor R3 and serves as the output terminal.

[0069] The working principle and beneficial effects of the above technical solution are as follows: In this solution, by providing a differential amplification circuit in the amplification chip, the loss of long-distance signal transmission is compensated, providing a reliable and easily recognizable signal for the receiving-end device; the differential amplification module U1 and the operational amplifier U2 are used to amplify the signal in two steps. First, the differential amplification method is adopted to compensate for the drift defect and improve the signal-to-noise ratio; then, the operational amplifier is used for secondary amplification, which can greatly improve the anti-interference ability and ensure the quality and reliability of signal transmission.

[0070] In one embodiment, the distribution chip processes the input signal by using spectral subtraction and wavelet transform as follows:

[0071] In the transmission time domain t of the current transmission signal, after windowing each output sub-signal X(i), a discrete Fourier transform is performed to obtain the transformed sub-signal X i (n), the amplitude of the transformed sub-signal, and the average noise energy;

[0072] The following spectral subtraction algorithm is used to perform spectral subtraction on the transformed sub-signal:

[0073]

[0074] In the above formula, |A i (t)| represents the amplitude of the sub-signal after spectral subtraction of the transformed sub-signal of the transmission signal in the transmission time domain t; |X i (t)| represents the amplitude of the i-th transformed sub-signal in the transmission time domain t; a represents the over-subtraction factor; |q i | represents the average noise energy; b represents the gain compensation factor; t represents the transmission time domain of the current transmission signal;

[0075] Using the amplitude of the sub-signal after spectral subtraction combined with the phase of the sub-signal before spectral subtraction, an inverse Fourier transform is performed to obtain the sub-signal after spectral subtraction processing;

[0076] According to the characteristics of the wavelet and the output sub-signal, the wavelet basis and the number of wavelet decomposition layers are determined, and wavelet transform is performed on the sub-signal after spectral subtraction processing. The wavelet basis can be selected as the Daubechies wavelet basis with an order of 15 to 25, and the number of wavelet decomposition layers is taken as 3 to 5.

[0077] The working principle and beneficial effects of the above technical solution are as follows: This solution uses spectral subtraction and wavelet transform to remove the noise interference of the output sub-signal, improves the accuracy of the transmission time domain and frequency domain characteristics of the transmission signal, and can sensitively separate the noise in the original output sub-signal; This solution has good real-time operation, small amount of calculation, strong robustness, has the characteristic of less demand for prior knowledge of noise, and high accuracy, can improve the quality of the sub-signal processed by the distribution chip output, and avoid the distortion of the sub-signal caused by interference signals.

[0078] The HDMI optical fiber extender of the present invention uses a distribution chip, which can be one-to-two, one-to-four, one-to-eight, etc.; it can connect multiple devices at the sending end in the short distance, and can also connect multiple devices at the receiving end in the long distance. The HDMI optical fiber extender of the present invention connects the data transmission end and the receiving end through an optical fiber, and can realize the transmission of the data signal of the first device host at the transmission end to the second device terminal connected to the receiving end and the third device terminal connected to the transmission end, so as to realize the local loop-out and long-distance transmission of the HDMI signal, and the cost is relatively reduced. The screw locking structure is adopted to ensure the high reliability of product use and facilitate plugging and unplugging for maintenance. At the same time, in the present invention, the optoelectronic conversion engine module and the SWDM module are modularized through a carrier board, which can improve the coupling accuracy and positioning accuracy, and is beneficial to improving the production efficiency of mass production.

[0079] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An HDMI fiber optic extender capable of realizing long-distance data transmission, characterized in that, it includes a transmitting end and a receiving end; The transmitting end includes an HDMI input interface, a first HDMI output interface, a distribution chip, a first optoelectronic engine module and a first SWDM module; the distribution chip is respectively connected to the HDMI input interface, the first HDMI output interface and the first optoelectronic engine module, and the first optoelectronic engine module is connected to the first SWDM module; The receiving end includes a second SWDM module, a second optoelectronic engine module, an amplification chip and a second HDMI output interface; the second SWDM module is connected to the first SWDM module through an optical fiber; the second SWDM module is connected to the second optoelectronic engine module, and the amplification chip is respectively connected to the second optoelectronic engine module and the second HDMI output interface; The HDMI input interface, the first HDMI output interface, the distribution chip, the first optoelectronic engine module and the first SWDM module are integrated on the transmitting main board; The second SWDM module, the second optoelectronic engine module, the amplification chip and the second HDMI output interface are integrated on the receiving main board; Both the transmitting main board and the receiving main board are configured with a housing, and the housing includes an upper cover and a lower cover; The lower cover is provided with a receiving space for accommodating the transmitting main board or the receiving main board, two slots for cooperating with the LC locking member, and a DC power jack; after the upper cover and the lower cover are combined, two optical ports are formed, and the two slots and the DC power jack are arranged at one end of the upper cover; A screw hole is provided on one side of the lower cover adjacent to the DC power jack, and screw holes are respectively provided near the two bottom corners on the other side of the lower cover. Screw holes are provided at the positions corresponding to the screw holes of the lower cover on the upper cover. After the upper cover and the lower cover are combined, they are fixedly connected by screws; Screw posts are provided at the positions of the lower cover corresponding to the screw holes of the transmitting main board or the receiving main board, and circular limiting posts are provided at the positions of the upper cover corresponding to the circular screw post avoidance holes of the transmitting main board or the receiving main board; Two empty slots are provided on one side of the upper cover of the transmitting end adjacent to the DC power socket, and the two empty slots are respectively used for accommodating the LED indicator light and the MODE key; The transmitting main board and the receiving main board are respectively provided with a first carrier board and a second carrier board. The first carrier board is provided with a first optoelectronic conversion engine and a first SWDM module, and the second carrier board is provided with a second optoelectronic conversion engine and a second SWDM module; the optical ports of the first SWDM module and the second SWDM module are aligned with the LC locking member to achieve quick plugging.

2. The HDMI fiber optic extender capable of realizing long-distance data transmission according to claim 1, characterized in that, The input signal of the HDMI input interface is an HDMI signal, which is divided into two paths of signals by the distribution chip. The first path of signal uses wavelength division multiplexing technology to transmit four groups of high-speed differential signals to the first optoelectronic conversion engine module. The first optoelectronic conversion engine module converts the four groups of high-speed differential signals into OM3 optical signals, and the OM3 optical signals are output through the first SWDM module and the optical fiber; the second path of signal is output through the first HDMI output interface; The second SWDM module receives the OM3 optical signal transmitted by the optical fiber and transmits it to the second optoelectronic conversion engine module. The second optoelectronic conversion engine module converts the OM3 optical signal into four groups of high-speed differential signals. The four groups of high-speed differential signals are restored to HDMI signals by the amplification chip and output through the second HDMI output interface.

3. The HDMI optical fiber extender capable of realizing long-distance data transmission according to claim 1, characterized in that, both the transmitting end and the receiving end are configured with power supplies for power supply.

4. The HDMI optical fiber extender capable of realizing long-distance data transmission according to claim 1, characterized in that, the distribution chip adopts MS9332, the distribution chip is configured with a plurality of first HDMI output interfaces, and each first HDMI output interface is connected to a third device; the amplification chip adopts PI3HDMI336, and the amplification chip is connected to a second device through the first HDMI output interface.

5. The HDMI optical fiber extender capable of realizing long-distance data transmission according to claim 4, characterized in that, the HDMI input interface is connected to a first device, and the first device is one of a monitoring camera, a DVD player, a notebook, and a camera; both the second device and the third device are at least one of a television, a display screen, and a projector.

6. The HDMI optical fiber extender capable of realizing long-distance data transmission according to claim 1, characterized in that, the HDMI input interface and the first HDMI output interface are of the same type but cannot be inserted into each other reversely, and the HDMI input interface and the second HDMI output interface are also of the same type but cannot be inserted into each other reversely.

7. The HDMI optical fiber extender capable of realizing long-distance data transmission according to claim 1, characterized in that, the distribution chip includes an input channel and a plurality of output channels, and the input channel is connected to the plurality of output channels through a bifurcation circuit; the bifurcation circuit has a tree-like structure: two or more branch lines are formed by bifurcating the main input line, and the branch lines are further bifurcated to form two or more sub-branch lines, and the bifurcation times are determined according to the number of output channels; the main input line is connected to the input channel, and the ends of the bifurcated branch lines are connected to the output channels; the distribution chip further includes a channel monitoring module and a distribution management module, the channel monitoring module is used to monitor the external device conditions of the input channel and the output channels; the distribution management module is used to calculate and adjust the output signal intensity of each output channel according to the external device conditions.

8. The HDMI optical fiber extender capable of realizing long-distance data transmission according to claim 1, characterized in that, the amplification chip is provided with a differential amplification circuit, and the differential amplification circuit includes a differential amplification module U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, and an operational amplifier U2; Pin 3 and pin 2 of the differential amplifier module U1 are input terminals; pin 1 of the differential amplifier module U1 is grounded; pin 4 of the differential amplifier module U1 is connected to the cathode of the first capacitor C1 and is connected to a -15V voltage, and the anode of the first capacitor C1 is grounded; pin 7 of the differential amplifier module U1 is connected to the anode of the second capacitor C2 and is connected to a +15V voltage, and the cathode of the second capacitor C2 is grounded, and pin 8 of the differential amplifier module U1 is left floating; pin 5 and pin 6 of the differential amplifier module U1 are connected to the anode of the third capacitor C3, and the cathode of the third capacitor C3 is connected to one end of the first resistor R1 and the input terminal pin 3 of the operational amplifier U2, and the other end of the first resistor R1 is grounded; The input terminal pin 2 of the operational amplifier U2 is connected to one end of the second resistor R2 and one end of the third resistor R3, and the other end of the second resistor R2 is grounded; pin 7 of the operational amplifier U2 is connected to the anode of the fourth capacitor C4 and is connected to a +15V voltage, and the cathode of the fourth capacitor C4 is grounded; pin 4 of the operational amplifier U2 is connected to the cathode of the fifth capacitor C5 and is connected to a -15V voltage, and the anode of the fifth capacitor C5 is grounded; pin 6 of the operational amplifier U2 is connected to the other end of the third resistor R3 and serves as the output terminal.

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