SDI signal photoelectric hybrid transmission system and method

Abstract

The invention belongs to the technical field of video signal transmission, and particularly relates to an SDI signal photoelectric hybrid transmission system and method.The SDI signal photoelectric hybrid transmission system comprises an SDI video source 1, an SDI video source 2, an SDI video source 3, an SDI sending optical transceiver, a photoelectric slip ring, an SDI receiving optical transceiver, a monitor 1 and a monitor 2; according to the invention, through combination and matching transmission of the optical link and the electric link, connection and use of a general video source and a monitor standard SDI interface are ensured, loss caused by full-link electric signal transmission is reduced, high-definition, compression-free and low-loss SDI signal transmission is realized through a photoelectric hybrid transmission mode, software program development is not needed, and the cost is reduced. The method is more convenient and reliable, and a video source channel signal gating function can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of video signal transmission, and in particular relates to an SDI signal optoelectronic hybrid transmission system and method. Background Art

[0002] With the development of video technology, the demand for transmitting high-definition video signals is growing. Traditional electrical signal transmission methods suffer from signal attenuation and interference during long-distance transmission, while optical signal transmission can effectively solve these problems. However, a fully optical signal transmission system needs to be compatible with the existing SDI interface standard, and in some application scenarios, electrical signal transmission is more convenient. Therefore, the development of an SDI signal optical-electrical hybrid transmission system can not only ensure compatibility with existing equipment but also reduce signal transmission loss. This system has important practical application value. At the same time, it can realize the switching and selection of multi-source video, has high reliability and convenience, and is also of great promotional significance. Summary of the Invention

[0003] (1) Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is: how to provide an SDI signal optoelectronic hybrid transmission system and method that can effectively reduce signal transmission loss, adapt to existing SDI video sources and monitors and other equipment, and realize switching and selecting of video channels as needed, thereby improving convenience and reliability of use.

[0005] (2) Technical solution

[0006] In order to solve the above technical problems, the present invention provides an SDI signal optoelectronic hybrid transmission system, which includes: an SDI video source 1, an SDI video source 2, an SDI video source 3, an SDI transmitting optical terminal, an optoelectronic slip ring, an SDI receiving optical terminal, a monitor 1, and a monitor 2; the SDI transmitting optical terminal includes: a cable equalization signal processing unit, a clock recovery signal processing unit, a channel selection signal processing module, and an optical transmitting module; the SDI receiving optical terminal includes: an optical receiving module, a clock recovery signal processing unit, and a cable drive signal processing unit;

[0007] The SDI video source 1, SDI video source 2, and SDI video source 3 are video sources with standard SDI interfaces, and are used to send SDI video signals to an SDI optical transmitter.

[0008] The SDI optical transmitting terminal is used to receive three-way SDI video signals from SDI video source 1, SDI video source 2, and SDI video source 3, and output stable SDI differential signals through cable equalization signal processing and clock recovery signal processing of a cable equalization signal processing unit and a clock recovery signal processing unit, namely SDI signal 1, SDI signal 2, and SDI signal 3. SDI signal 1 and SDI signal 2 enter the channel selection signal processing module for switching and selecting and outputting SDI signal 4. SDI signal 3 and SDI signal 4 enter the optical transmitting module for electro-optical conversion, and are converted into optical signals that can be transmitted in optical fibers and output to the photoelectric slip ring.

[0009] The photoelectric slip ring is used to receive the optical signal from the SDI optical transmitter and resolve the data transmission problem in the rotary connection;

[0010] The optical receiving module of the SDI receiving optical terminal is used to receive the optical signal from the photoelectric slip ring, perform photoelectric conversion, and convert it into an electrical signal. After that, the optical receiving module performs clock recovery signal processing and cable drive signal processing through the clock recovery signal processing unit and the cable drive signal processing unit, and outputs the SDI electrical signal of the standard interface to be sent to the monitor 1 and the monitor 2;

[0011] The monitor 1 and the monitor 2 are used to receive the SDI signal from the SDI optical receiving terminal to complete the video display and monitoring functions. The monitor 1 and the monitor 2 have standard SDI interfaces.

[0012] The control signal for switching between two channels of the channel selection signal processing module is provided by the external IO interface signal after being converted by the photoelectric coupler.

[0013] The photoelectric coupler realizes the isolation protection and signal transmission functions of the IO interface signal.

[0014] The channel selection signal processing module is used to realize the switching and selection function of two-way SDI signals, and the channel selection signal processing module includes a buffer circuit and a cross switch circuit;

[0015] The buffer circuit is used to convert the level of the TTL signal of the video switching and increase its driving capability. The cross switch circuit is used to select the two sets of input differential signals according to the level of the external input, thereby selecting one of the two SDI signals.

[0016] The optical transmission module is used to convert the input SDI signal 3 and SDI signal 4 into electrical signals and optical signals. The optical transmission module has a built-in wavelength division multiplexer to meet the function of simultaneously transmitting optical signals of two channels.

[0017] The photoelectric slip ring is used to receive the optical signal from the SDI optical transmitter, solve the data transmission problem in the rotary connection, achieve the requirements of high-speed and contactless transmission, and is widely used in many fields.

[0018] The optical receiving module of the SDI optical receiving terminal is used to perform photoelectric conversion on the two input optical signals. A wavelength division multiplexer is integrated inside the optical receiving module to meet the function of simultaneously receiving optical signals of two channels.

[0019] In addition, the present invention further provides an SDI signal optoelectronic hybrid transmission method, which is implemented based on the SDI signal optoelectronic hybrid transmission system according to any one of claims 1 to 6, and includes:

[0020] Step 1: The SDI video source 1, SDI video source 2, and SDI video source 3 send SDI video signals to the SDI optical transmitter;

[0021] Step 2: The SDI optical transmitting terminal receives three channels of SDI video signals from SDI video source 1, SDI video source 2, and SDI video source 3, and outputs stable SDI differential signals, namely SDI signal 1, SDI signal 2, and SDI signal 3, through cable equalization signal processing and clock recovery signal processing by the cable equalization signal processing unit and the clock recovery signal processing unit. SDI signal 1 and SDI signal 2 enter the channel selection signal processing module for switching and selecting to output SDI signal 4. SDI signal 3 and SDI signal 4 enter the optical transmitting module for electro-optical conversion, and are converted into optical signals that can be transmitted in the optical fiber and output to the optoelectronic slip ring.

[0022] Step 3: The optoelectronic slip ring receives the optical signal from the SDI optical transmitter;

[0023] Step 4: The optical receiving module of the SDI optical receiving terminal receives the optical signal from the photoelectric slip ring, performs photoelectric conversion, and converts it into an electrical signal. After that, the optical receiving module performs clock recovery signal processing and cable drive signal processing by the clock recovery signal processing unit and the cable drive signal processing unit, and outputs the SDI electrical signal of the standard interface to the monitor 1 and the monitor 2;

[0024] Step 5: The monitor 1 and the monitor 2 receive the SDI signal from the SDI optical receiving terminal to complete the video display and monitoring functions. The monitor 1 and the monitor 2 have standard SDI interfaces.

[0025] Wherein, in said step 2, the control signal for switching between two channels of said channel selection signal processing module is provided by an external IO interface signal after being converted by said photoelectric coupler;

[0026] The photoelectric coupler realizes the isolation protection and signal transmission functions of the IO interface signal;

[0027] The channel selection signal processing module is used to realize the switching and selection function of two-way SDI signals, and the channel selection signal processing module includes a buffer circuit and a cross switch circuit;

[0028] The buffer circuit is used to convert the level of the TTL signal of the video switching and increase its driving capability. The cross switch circuit is used to select the two sets of input differential signals according to the level of the external input, thereby selecting one of the two SDI signals.

[0029] Among them, in the step 2, the optical transmission module converts the input SDI signal 3 and SDI signal 4 into electrical signals and optical signals. The optical transmission module has a built-in wavelength division multiplexer to meet the function of simultaneously transmitting optical signals of two channels.

[0030] Wherein, in step 3, the photoelectric slip ring receives the optical signal from the SDI optical transmitter, solves the data transmission problem in the rotary connection, realizes the requirements of high-speed and contactless transmission, and is widely used in multiple fields;

[0031] In step 4, the optical receiving module of the SDI optical receiving terminal performs photoelectric conversion on the two input optical signals. The optical receiving module integrates a wavelength division multiplexer to meet the function of simultaneously receiving optical signals of two channels.

[0032] (3) Beneficial effects

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) Compatibility and low loss: Through the combination of optical and electrical links, it not only ensures the connection with the video source and monitor standard SDI interface, but also reduces the loss caused by the all-electrical signal transmission link, meeting the high-definition, uncompressed, and low-loss requirements of SDI high-speed signal transmission;

[0035] (2) Convenience and reliability: The SDI receiving optical terminal and SDI transmitting optical terminal in the system use hardware circuits to build functional requirements, without the need for additional software program development, which is convenient, simple and more reliable;

[0036] (3) Signal gating function: It can realize the signal gating function of video channel and enhance the flexibility and applicability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the framework structure of the technical solution of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purposes, contents and advantages of the present application clearer, the specific embodiments of the present application are described in further detail below in combination with the drawings and examples.

[0039] To solve the above technical problems, the present application provides an SDI signal photoelectric hybrid transmission system, which comprises: an SDI video source 1, an SDI video source 2, an SDI video source 3, an SDI sending optical transceiver, an optical and electrical slip ring, an SDI receiving optical transceiver, a monitor 1 and a monitor 2; the SDI sending optical transceiver comprises: a cable equalization signal processing unit, a clock recovery signal processing unit, a channel gating signal processing module and an optical transmitting module; the SDI receiving optical transceiver comprises: an optical receiving module, a clock recovery signal processing unit and a cable driving signal processing unit.

[0040] The SDI video source 1, the SDI video source 2 and the SDI video source 3 are video sources with standard SDI interfaces, which are used to send SDI video signals to the SDI sending optical transceiver.

[0041] The SDI sending optical transceiver is used to receive three-way SDI video signals from the SDI video source 1, the SDI video source 2 and the SDI video source 3, and to output stable SDI differential signals, namely SDI signal 1, SDI signal 2 and SDI signal 3, through cable equalization signal processing and clock recovery signal processing of the cable equalization signal processing unit and the clock recovery signal processing unit, wherein the SDI signal 1 and the SDI signal 2 enter the channel gating signal processing module to be switched and gated to output an SDI signal 4, and the SDI signal 3 and the SDI signal 4 enter the optical transmitting module to be converted into optical signals that can be propagated in an optical fiber and output to the optical and electrical slip ring.

[0042] The optical and electrical slip ring is used to receive optical signals from the SDI sending optical transceiver to solve the data transmission problem in the rotary connection.

[0043] The optical receiving module of the SDI receiving optical transceiver is used to receive optical signals from the optical and electrical slip ring, to perform photoelectric conversion, to convert into electrical signals, and to output standard interface SDI electrical signals to the monitor 1 and the monitor 2 through clock recovery signal processing and cable driving signal processing of the clock recovery signal processing unit and the cable driving signal processing unit.

[0044] The monitor 1 and the monitor 2 are used to receive SDI signals from the SDI receiving optical transceiver to complete video display and monitoring functions, and the monitor 1 and the monitor 2 have standard SDI interfaces.

[0045] The control signal for switching between two channels of the channel selection signal processing module is provided by the external IO interface signal after being converted by the photoelectric coupler.

[0046] The photoelectric coupler realizes the isolation protection and signal transmission functions of the IO interface signal.

[0047] The channel selection signal processing module is used to realize the switching and selection function of two-way SDI signals, and the channel selection signal processing module includes a buffer circuit and a cross switch circuit;

[0048] The buffer circuit is used to convert the level of the TTL signal of the video switching and increase its driving capability. The cross switch circuit is used to select the two sets of input differential signals according to the level of the external input, thereby selecting one of the two SDI signals.

[0049] The optical transmission module is used to convert the input SDI signal 3 and SDI signal 4 into electrical signals and optical signals. The optical transmission module has a built-in wavelength division multiplexer to meet the function of simultaneously transmitting optical signals of two channels.

[0050] The photoelectric slip ring is used to receive the optical signal from the SDI optical transmitter, solve the data transmission problem in the rotary connection, achieve the requirements of high-speed and contactless transmission, and is widely used in many fields.

[0051] The optical receiving module of the SDI optical receiving terminal is used to perform photoelectric conversion on the two input optical signals. A wavelength division multiplexer is integrated inside the optical receiving module to meet the function of simultaneously receiving optical signals of two channels.

[0052] In addition, the present invention further provides an SDI signal optoelectronic hybrid transmission method, which is implemented based on the SDI signal optoelectronic hybrid transmission system according to any one of claims 1 to 6, and includes:

[0053] Step 1: The SDI video source 1, SDI video source 2, and SDI video source 3 send SDI video signals to the SDI optical transmitter;

[0054] Step 2: The SDI optical transmitting terminal receives three channels of SDI video signals from SDI video source 1, SDI video source 2, and SDI video source 3, and outputs stable SDI differential signals through cable equalization signal processing and clock recovery signal processing by the cable equalization signal processing unit and the clock recovery signal processing unit, namely SDI signal 1, SDI signal 2, and SDI signal 3. SDI signal 1 and SDI signal 2 enter the channel selection signal processing module for switching and selecting to output SDI signal 4. SDI signal 3 and SDI signal 4 enter the optical transmitting module for electro-optical conversion, and are converted into optical signals that can be transmitted in the optical fiber and output to the optoelectronic slip ring;

[0055] Step 3: The optoelectronic slip ring receives the optical signal from the SDI optical transmitter;

[0056] Step 4: The optical receiving module of the SDI optical receiving terminal receives the optical signal from the photoelectric slip ring, performs photoelectric conversion, and converts it into an electrical signal. After that, the optical receiving module performs clock recovery signal processing and cable drive signal processing by the clock recovery signal processing unit and the cable drive signal processing unit, and outputs the SDI electrical signal of the standard interface to the monitor 1 and the monitor 2;

[0057] Step 5: The monitor 1 and the monitor 2 receive the SDI signal from the SDI optical receiving terminal to complete the video display and monitoring functions. The monitor 1 and the monitor 2 have standard SDI interfaces.

[0058] Wherein, in said step 2, the control signal for switching between two channels of said channel selection signal processing module is provided by an external IO interface signal after being converted by said photoelectric coupler;

[0059] The photoelectric coupler realizes the isolation protection and signal transmission functions of the IO interface signal;

[0060] The channel selection signal processing module is used to realize the switching and selection function of two-way SDI signals, and the channel selection signal processing module includes a buffer circuit and a cross switch circuit;

[0061] The buffer circuit is used to convert the level of the TTL signal of the video switching and increase its driving capability. The cross switch circuit is used to select the two sets of input differential signals according to the level of the external input, thereby selecting one of the two SDI signals.

[0062] Among them, in the step 2, the optical transmission module converts the input SDI signal 3 and SDI signal 4 into electrical signals and optical signals. The optical transmission module has a built-in wavelength division multiplexer to meet the function of simultaneously transmitting optical signals of two channels.

[0063] Wherein, in step 3, the photoelectric slip ring receives the optical signal from the SDI optical transmitter, solves the data transmission problem in the rotary connection, realizes the requirements of high-speed and contactless transmission, and is widely used in multiple fields;

[0064] In step 4, the optical receiving module of the SDI optical receiving terminal performs photoelectric conversion on the two input optical signals. The optical receiving module integrates a wavelength division multiplexer to meet the function of simultaneously receiving optical signals of two channels.

[0065] Example 1

[0066] In order to solve the above technical problems, the present invention provides an SDI signal optoelectronic hybrid transmission system and method, such as Figure 1 As shown, the system includes: SDI video source 1, SDI video source 2, SDI video source 3, SDI transmitting optical terminal, photoelectric slip ring, SDI receiving optical terminal, monitor 1, monitor 2;

[0067] The SDI video source 1, SDI video source 2, and SDI video source 3 are video sources with standard SDI interfaces, which send SDI video signals to an SDI optical transmitter.

[0068] The SDI optical transmitting terminal receives three-way SDI video signals from SDI video source 1, SDI video source 2, and SDI video source 3, and outputs stable SDI differential signals through cable equalization signal processing and clock recovery signal processing, namely SDI signal 1, SDI signal 2, and SDI signal 3. SDI signal 1 and SDI signal 2 enter the channel selection signal processing module for switching and outputting SDI signal 4. The control signal for channel two-to-one switching is provided by the external IO interface signal after conversion by the photoelectric coupler. SDI signal 3 and SDI signal 4 enter the optical transmitting module for electro-optical conversion, and are converted into optical signals that can be transmitted in the optical fiber and output to the photoelectric slip ring.

[0069] The photoelectric coupler realizes the isolation protection and signal transmission functions of the IO interface signal;

[0070] The channel selection signal processing module implements the switching and selection function of two-way SDI signals, including a buffer circuit and a cross switch circuit. The buffer circuit converts the level of the TTL signal of the video switching and increases its driving capability. The cross switch circuit selects the two sets of input differential signals according to the level of the external input, thereby selecting one of the two SDI signals.

[0071] The light emitting module is built-in with a wavelength division multiplexer, and satisfies the function of simultaneous emission of two-channel optical signals.

[0072] The photoelectric slip ring receives the optical signals from the SDI sending optical transceiver, solves the data transmission problem in the rotary connection, realizes the requirement of high-speed and non-contact transmission, and is widely applied in multiple fields.

[0073] The SDI receiving optical transceiver receives the optical signals from the photoelectric slip ring, carries out photoelectric conversion, carries out clock recovery signal processing and cable driving signal processing after being converted into electrical signals, and outputs the SDI electrical signals of a standard interface to the monitor 1 and the monitor 2.

[0074] The light receiving module is built-in with a wavelength division multiplexer, and satisfies the function of simultaneous reception of two-channel optical signals.

[0075] The monitor 1 and the monitor 2 receive the SDI signals from the SDI receiving optical transceiver, complete the video display and monitoring function, and are provided with a standard SDI interface.

[0076] In conclusion, the SDI signal photoelectric hybrid transmission system and method can effectively solve the problems of signal attenuation and interference in the long-distance transmission process of electrical signals, is compatible with the video source and the monitor and other equipment of the SDI standard, has high adaptability and application promotion in the actual application process, uses pure hardware circuit to build the functional requirements in the important signal processing and photoelectric conversion links of the system, does not need to develop software, is more simple and convenient and easy to use, and has higher reliability, and can select the output of the SDI signal based on the external IO interface control signal in combination with the actual requirement, has the switching function for the input of multiple source videos, and better meets the requirement of the user.

[0077] The above only describes the preferred embodiments of the present application, and it should be noted that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. An SDI signal optoelectronic hybrid transmission system, characterized in that: The SDI signal optoelectronic hybrid transmission system includes: SDI video source 1, SDI video source 2, SDI video source 3, SDI optical transmitter, optoelectronic slip ring, SDI optical receiver, monitor 1, monitor 2; the SDI optical transmitter includes: cable equalization signal processing unit, clock recovery signal processing unit, channel selection signal processing module, optical transmitter module; the SDI optical receiver includes: optical receiver module, clock recovery signal processing unit and cable drive signal processing unit; The SDI video source 1, SDI video source 2, and SDI video source 3 are video sources with standard SDI interfaces, and are used to send SDI video signals to an SDI optical transmitter. The SDI optical transmitting terminal is used to receive three-way SDI video signals from SDI video source 1, SDI video source 2, and SDI video source 3, and output stable SDI differential signals through cable equalization signal processing and clock recovery signal processing of a cable equalization signal processing unit and a clock recovery signal processing unit, namely SDI signal 1, SDI signal 2, and SDI signal 3. SDI signal 1 and SDI signal 2 enter the channel selection signal processing module for switching and selecting and outputting SDI signal 4. SDI signal 3 and SDI signal 4 enter the optical transmitting module for electro-optical conversion, and are converted into optical signals that can be transmitted in optical fibers and output to the photoelectric slip ring. The photoelectric slip ring is used to receive the optical signal from the SDI optical transmitter and resolve the data transmission problem in the rotary connection; The optical receiving module of the SDI receiving optical terminal is used to receive the optical signal from the photoelectric slip ring, perform photoelectric conversion, and convert it into an electrical signal. After that, the optical receiving module performs clock recovery signal processing and cable drive signal processing through the clock recovery signal processing unit and the cable drive signal processing unit, and outputs the SDI electrical signal of the standard interface to be sent to the monitor 1 and the monitor 2; The monitor 1 and the monitor 2 are used to receive the SDI signal from the SDI optical receiving terminal to complete the video display and monitoring functions. The monitor 1 and the monitor 2 have standard SDI interfaces.

2. The SDI signal optoelectronic hybrid transmission system according to claim 1, wherein: The control signal for the channel selection signal processing module to switch between two channels is provided by the external IO interface signal after being converted by the photoelectric coupler.

3. The SDI signal optoelectronic hybrid transmission system according to claim 2, wherein: The photoelectric coupler realizes the isolation protection and signal transmission functions of the IO interface signal.

4. The SDI signal optoelectronic hybrid transmission system according to claim 1, wherein: The channel selection signal processing module is used to realize the switching and selection function of two-way SDI signals, and the channel selection signal processing module includes a buffer circuit and a cross switch circuit; The buffer circuit is used to convert the level of the TTL signal of the video switching and increase its driving capability. The cross switch circuit is used to select the two sets of input differential signals according to the level of the external input, thereby selecting one of the two SDI signals.

5. The SDI signal optoelectronic hybrid transmission system according to claim 1, wherein: The optical transmission module is used to convert the input SDI signal 3 and SDI signal 4 into electrical signals and optical signals. The optical transmission module has a built-in wavelength division multiplexer to meet the function of simultaneously transmitting optical signals of two channels.

6. The SDI signal optoelectronic hybrid transmission system according to claim 1, wherein: The photoelectric slip ring is used to receive the optical signal from the SDI optical transmitter, solve the data transmission problem in the rotary connection, and achieve the requirements of high-speed and contactless transmission; The optical receiving module of the SDI optical receiving terminal is used to perform photoelectric conversion on the two input optical signals. A wavelength division multiplexer is integrated inside the optical receiving module to meet the function of simultaneously receiving optical signals of two channels.

7. A method for optical-electrical hybrid transmission of SDI signals, characterized in that: The SDI signal optoelectronic hybrid transmission method is implemented based on the SDI signal optoelectronic hybrid transmission system according to any one of claims 1 to 6, and the SDI signal optoelectronic hybrid transmission method includes: Step 1: The SDI video source 1, SDI video source 2, and SDI video source 3 send SDI video signals to the SDI optical transmitter; Step 2: The SDI optical transmitting terminal receives three channels of SDI video signals from SDI video source 1, SDI video source 2, and SDI video source 3, and outputs stable SDI differential signals through cable equalization signal processing and clock recovery signal processing by the cable equalization signal processing unit and the clock recovery signal processing unit, namely SDI signal 1, SDI signal 2, and SDI signal 3. SDI signal 1 and SDI signal 2 enter the channel selection signal processing module for switching and selecting to output SDI signal 4. SDI signal 3 and SDI signal 4 enter the optical transmitting module for electro-optical conversion, and are converted into optical signals that can be transmitted in the optical fiber and output to the optoelectronic slip ring; Step 3: The optoelectronic slip ring receives the optical signal from the SDI optical transmitter; Step 4: The optical receiving module of the SDI optical receiving terminal receives the optical signal from the photoelectric slip ring, performs photoelectric conversion, and converts it into an electrical signal. After that, the optical receiving module performs clock recovery signal processing and cable drive signal processing by the clock recovery signal processing unit and the cable drive signal processing unit, and outputs the SDI electrical signal of the standard interface to the monitor 1 and the monitor 2; Step 5: The monitor 1 and the monitor 2 receive the SDI signal from the SDI optical receiving terminal to complete the video display and monitoring functions. The monitor 1 and the monitor 2 have standard SDI interfaces.

8. The SDI signal optical-electrical hybrid transmission method according to claim 7, wherein: In step 2, the control signal for the channel selection signal processing module to switch between two channels is provided by the external IO interface signal after being converted by the photoelectric coupler; The photoelectric coupler realizes the isolation protection and signal transmission functions of the IO interface signal; The channel selection signal processing module is used to realize the switching and selection function of two-way SDI signals, and the channel selection signal processing module includes a buffer circuit and a cross switch circuit; The buffer circuit is used to convert the level of the TTL signal of the video switching and increase its driving capability. The cross switch circuit is used to select the two sets of input differential signals according to the level of the external input, thereby selecting one of the two SDI signals.

9. The SDI signal optical-electrical hybrid transmission method according to claim 7, wherein: In step 2, the optical transmission module converts the input SDI signal 3 and the input SDI signal 4 into an electrical signal and an optical signal. The optical transmission module has a built-in wavelength division multiplexer to meet the function of simultaneously transmitting optical signals of two channels.

10. The SDI signal optical-electrical hybrid transmission method according to claim 7, wherein: In step 3, the photoelectric slip ring receives the optical signal from the SDI optical transmitter, thereby solving the data transmission problem in the rotary connection and achieving the requirements of high-speed and contactless transmission; In step 4, the optical receiving module of the SDI optical receiving terminal performs photoelectric conversion on the two input optical signals. The optical receiving module integrates a wavelength division multiplexer to meet the function of simultaneously receiving optical signals of two channels.

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