Audio and video transmission equipment, playback equipment and transmission method suitable for railway environment

Abstract

The present invention provides an audio and video transmission device, a propagation device and a transmission method suitable for a railway environment, wherein the audio and video transmission device comprises: a transmitting part and a receiving part. The transmitting part comprises: a signal input terminal, a signal de-embedding conversion module and a signal encoding module connected in sequence; the signal input terminal receives a video signal and an audio signal; the signal de-embedding conversion module converts both the video signal and the audio signal into a digital signal; the signal encoding module uniformly encodes the video signal and the audio signal. The receiving part comprises: a signal embedding conversion module and a signal output terminal connected to each other; the signal embedding conversion module is connected to a signal encoding module to convert the uniformly encoded video signal and audio signal into different types of video signals and audio signals; the signal output terminal outputs the video signal and the audio signal. The present invention effectively solves the problem of incompatibility between displays, speakers, audio and audio and video transmission equipment and industrial computers.

Description

Technical Field

[0001] The present invention relates to the field of rail transit communication signal technology, and in particular to an audio and video transmission device, a playback device and a transmission method suitable for a railway environment. Background Art

[0002] In the railway signal system, when the industrial computer is used with the display, because the industrial computer and the display are placed in different places, in order to transmit the audio and video signals of the industrial computer, a KVM (keyboard video mouse switching system) audio and video extender (referred to as extender) is often used to transmit through a point-to-point method. Figure 1 As shown, the industrial computer and the transmitter of the extender are transmitted via a video cable and an audio cable, respectively transmitting the video signal and the audio signal; the transmitter of the extender and the receiver of the extender are transmitted via an optical fiber cable, transmitting the video signal and the audio signal to the receiver of the extender; the receiver of the extender is connected to the display signal via an HDMI (high-definition multimedia) video cable, transmitting the video signal and the audio signal to the display; and the receiver of the extender is connected to an external speaker via an audio cable, sending the audio signal to the speaker.

[0003] Ideally, the signal transmission types between industrial computers, KVMs, and monitors and speakers are consistent, and the EDID protocol (Extended Display Identification Data Protocol) can be used to identify each other's signals. The audio and video signals (i.e., the video signal and its embedded audio signal) sent by the industrial computer are transmitted to the monitor through the extender, displayed by the monitor, and then sounded through the speakers. However, due to various uncertain factors such as changes in customer needs, discontinuation of production and upgrades of adaptation equipment, and changes in the installation environment, the ports of the extender and the monitor are often inconsistent at the construction site, making the EDID protocol format supported by the monitor and speakers unrecognizable to the extender and industrial computer, causing various compatibility problems in the signal transmission process, including but not limited to: black screen, resolution cannot be adjusted, software cannot be full screen, audio cannot be output, etc., which in turn causes problems such as signal transmission system downtime or monitor blue screen, affecting the debugging and opening of the railway signal system, causing project delays and causing economic losses to the construction party. Summary of the invention

[0004] The purpose of the present invention is to provide an audio and video transmission device, a playback device and a transmission method suitable for a railway environment, which effectively solves the problem of incompatibility between a display, an audio device and an extender and an industrial computer, and improves the debugging efficiency and maintenance convenience of the extender and the industrial computer during signal transmission.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention provides an audio and video transmission device suitable for a railway environment, comprising: a transmitting part and a receiving part, wherein the transmitting part and the receiving part perform signal transmission;

[0006] The transmitting unit comprises:

[0007] Signal input terminal, used for inputting video signal and audio signal;

[0008] A signal de-embedding conversion module, connected to the signal input terminal, for de-embedding the digital audio and video signal input from the signal input terminal into a digital video signal and a digital audio signal, converting the analog video signal into a digital video signal for output, and converting the analog audio signal into a digital audio signal for output;

[0009] A signal encoding module, connected to the signal de-embedding conversion module, for uniformly encoding the digital video signal and the digital audio signal output by the signal de-embedding conversion module to obtain a video fusion signal and an audio fusion signal output;

[0010] The receiving unit comprises:

[0011] A signal embedding conversion module, connected to the signal encoding module, configured to embed the video fusion signal and the audio fusion signal output by the signal encoding module into a digital audio and video signal, convert the video fusion signal into an analog video signal, and convert the audio fusion signal into an analog audio signal;

[0012] The signal output terminal is connected to the signal embedding conversion module and is used to output video signals and audio signals.

[0013] Optionally, the signal input terminal includes: an analog video signal input terminal, a digital video signal input terminal, a digital audio and video signal input terminal, and an analog audio signal input terminal;

[0014] The signal de-embedding conversion module comprises:

[0015] A first conversion module, which is connected to the analog video signal input terminal, receives the analog video signal sent by the analog video signal input terminal, and converts the analog video signal from an analog signal to a digital signal to generate a digital video signal; the first conversion module is connected to the signal encoding module, and transmits the digital video signal to the signal encoding module;

[0016] A first transmission module, which is connected to the digital video signal input terminal, receives the digital video signal sent by the digital video signal input terminal, and is capable of transmitting the digital video signal; the first transmission module is connected to the signal encoding module, and transmits the digital video signal to the signal encoding module;

[0017] a de-embedding module, which is connected to the digital audio and video signal input terminal, receives the digital audio and video signal transmitted by the digital audio and video signal input terminal, and de-embeds the digital audio and video signal into a digital video signal and a digital audio signal; the de-embedding module is connected to the signal encoding module, and transmits the digital video signal and the digital audio signal to the signal encoding module;

[0018] The acquisition and conversion module is connected to the analog audio signal input terminal, receives the analog audio signal transmitted by the analog audio signal input terminal, and converts the analog audio signal from an analog signal to a digital signal to generate a digital audio signal; the acquisition and conversion module is connected to the signal encoding module, and transmits the digital audio signal to the signal encoding module.

[0019] Optionally, the signal encoding module includes: a video signal encoding module and an audio signal encoding module;

[0020] The video signal encoding module is connected to the first conversion module to receive the digital video signal sent by the first conversion module; the video signal encoding module is connected to the first transmission module to receive the digital video signal sent by the first encoding module; the video signal encoding module is connected to the de-embedding module to receive the digital video signal sent by the de-embedding module; the video signal encoding module can perform unified video encoding on the digital video signal to generate a video fusion signal;

[0021] The audio signal encoding module is connected to the de-embedding module to receive the digital audio signal sent by the de-embedding module; the audio signal encoding module is connected to the acquisition conversion module to receive the digital audio signal sent by the audio signal encoding module; the audio signal encoding module can perform unified audio encoding on the digital audio signal to generate an audio fusion signal.

[0022] Optionally, the signal output terminal includes: an analog video signal output terminal, a digital video signal output terminal, a digital audio and video signal output terminal, and an analog audio signal output terminal;

[0023] The signal embedding conversion module comprises:

[0024] A second conversion module, which is connected to the video signal encoding module, receives the video fusion signal sent by the video signal encoding module, and converts the video fusion signal from a digital signal to an analog signal to generate an analog video signal; the second conversion module is connected to the analog video signal output terminal, and sends the analog video signal to the analog video signal output terminal;

[0025] A second transmission module, which is connected to the video signal encoding module, receives the video fusion signal sent by the video signal encoding module, and uses the video fusion signal as a digital video signal; the second transmission module is connected to the digital video signal output terminal, and sends the digital video signal to the digital video signal output terminal;

[0026] An embedding module, which is connected to the video signal encoding module and can receive the video fusion signal sent by the video signal encoding module; the embedding module is connected to the audio signal encoding module and can receive the audio fusion signal sent by the audio signal encoding module; the embedding module can embed the audio fusion signal and the video fusion signal to generate a digital audio and video signal; the embedding module is connected to the digital audio and video signal output terminal and sends the digital audio and video signal to the digital audio and video signal output terminal;

[0027] The third conversion module is connected to the audio signal encoding module, capable of receiving the audio fusion signal sent by the audio signal encoding module, and converting the audio fusion signal from a digital signal to an analog signal to generate an analog audio signal; the third conversion module is connected to the analog audio signal output terminal, and sends the analog audio signal to the analog audio signal output terminal.

[0028] In a second aspect, the present invention provides an audio and video playback device suitable for a railway environment, comprising: the above-mentioned audio and video transmission device suitable for a railway environment, as well as an industrial computer, a display and an external speaker;

[0029] The industrial computer is used to send video signals and audio signals;

[0030] The audio and video transmission device is connected to the industrial computer, receives the video signal and audio signal sent by the industrial computer, and converts the video signal and audio signal into the video signal and audio signal required to be output by the signal output end;

[0031] The display is connected to the audio and video transmission device and can receive the video signal and audio signal transmitted by the audio and video transmission device;

[0032] The external speaker is connected to the audio and video transmission device via an audio cable and can receive the audio signal transmitted by the audio and video transmission device.

[0033] In a third aspect, the present invention further provides an audio and video transmission method applicable to a railway environment, the audio and video transmission method comprising:

[0034] The signal input terminal obtains the video signal and the audio signal through signal polling, and the signal de-embedding conversion module determines whether the obtained signal is a digital audio and video signal;

[0035] When the acquired signal is not a digital audio or video signal, the signal de-embedding and conversion module converts the video signal into a digital video signal and converts the audio signal into a digital audio signal;

[0036] When the acquired signal is a digital audio and video signal, the signal de-embedding conversion module de-embeds the digital audio and video signal into a digital audio signal and a digital video signal;

[0037] The signal encoding module uniformly encodes the digital video signal to generate a video fusion signal, and uniformly encodes the digital audio signal to generate an audio fusion signal; and the signal embedding conversion module converts the video fusion signal and the audio fusion signal into the video signal and audio signal required to be output by the signal output end according to the type of output signal required by the signal output end.

[0038] Optionally, when the acquired signal is an analog audio signal, the signal de-embedding conversion module converts the analog audio signal into a digital audio signal; and the audio signal encoding module performs unified audio encoding on the digital audio signal to generate an audio fusion signal, and then the signal embedding conversion module converts the audio fusion signal into an audio signal required to be output at the signal output end.

[0039] Optionally, when the acquired signal is a digital video signal, the signal de-embedding conversion module transmits the digital video signal; and the video signal encoding module performs unified video encoding on the digital video signal to generate a video fusion signal, and then the signal embedding conversion module converts the video fusion signal into a video signal required to be output by the signal output terminal;

[0040] The method for generating a video fusion signal by performing unified video encoding on the digital video signal includes:

[0041] The video signal encoding module reads the image information of image ratio, image refresh rate and image resolution contained in the digital video signal, performs unified video encoding processing on the image information, and converts the digital video signal into a video fusion signal.

[0042] Optionally, when the acquired signal is an analog video signal, the signal de-embedding conversion module converts the analog video signal into a digital video signal; and the video signal encoding module performs unified video encoding on the digital video signal to generate a video fusion signal, and then the signal embedding conversion module converts the video fusion signal into a video signal required to be output by the signal output terminal;

[0043] The method of converting the analog video signal into a digital video signal by the signal de-embedding conversion module includes:

[0044] The signal de-embedding conversion module reads the image information including the image ratio, image refresh rate and image resolution in the analog video signal, converts the analog video signal from an analog signal to a digital signal, and generates a digital video signal.

[0045] Optionally, the method for generating a video fusion signal by performing unified video encoding on the digital video signal includes:

[0046] The video signal encoding module reads the image information of image ratio, image refresh rate and image resolution contained in the digital video signal, performs unified video encoding on the image information, and converts the digital video signal into a video fusion signal.

[0047] Optionally, when the acquired signal is a digital audio and video signal, the signal de-embedding conversion module de-embeds the digital audio and video signal into a digital video signal and a digital audio signal; the video signal encoding module performs unified video encoding on the digital video signal to generate a video fusion signal, and the audio signal encoding module performs unified audio encoding on the digital audio signal to generate an audio fusion signal; the signal embedding conversion module converts the video fusion signal and the audio fusion signal into a video signal and an audio signal required to be output by the signal output terminal;

[0048] The method for generating a video fusion signal by performing unified video encoding on the digital video signal includes:

[0049] The video signal encoding module reads the image information of image ratio, image refresh rate and image resolution contained in the digital video signal, performs unified video encoding on the image information, and converts the digital video signal into a video fusion signal.

[0050] Optionally, the method of converting the video fusion signal and the audio fusion signal into the video signal and the audio signal required to be output by the signal output terminal by the signal embedding conversion module includes:

[0051] When the signal output terminal is a digital audio and video signal output terminal, the signal embedding conversion module embeds the video fusion signal and the audio fusion signal to generate a digital audio and video signal;

[0052] When the signal output end is not a digital audio and video signal output, the signal embedding conversion module converts the video fusion signal into a video signal required to be output by the signal output end, and converts the audio fusion signal into an audio signal required to be output by the signal output end.

[0053] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0054] The audio and video transmission device of the present invention re-encodes the video signal and the audio signal through the signal encoding module, so that the video signal and the audio signal have the same signal format, so as to change the signal type of the video signal and the audio signal and realize the mutual conversion of different types of signals. And the audio and video transmission device of the present invention can realize the remote transmission of the signal by setting the transmitting part and the receiving part.

[0055] The audio and video transmission device described in the present invention can change the types of input video signals and audio signals according to the types of output signals required by it. When the output port of its receiving part matches the ports of a display and an audio device, the video signals and audio signals output by the receiving part can be read by displays and audio devices with different signal type reading capabilities, effectively solving the problem that the display port is incompatible with the audio and video transmission device port and the industrial computer port, resulting in the display being unable to display or the audio being unable to play, and eliminating compatibility problems such as black screen, noise, jitter, etc. caused by using different peripheral displays.

[0056] The audio and video transmission method described in the present invention can convert the input video signal and audio signal into digital video signal and digital audio signal, and uniformly encode the digital video signal and digital audio signal, so that the video signal and audio signal can be converted into different types of signals, and the signal type of the video signal and audio signal can be changed according to the needs of the signal output end.

[0057] The audio and video playback device of the present invention is set to apply an audio and video transmission device, so that it can convert audio signals and video signals into output signals that can be read by a display and an audio device according to the type of output signal required by the signal output terminal, thereby solving the problem of mutual conversion of diversified interface protocols, so that the project site does not need to specifically refer to the port of the industrial computer, the port of the audio and video transmission device, the display port and the audio port for equipment procurement or construction, greatly improving the equipment debugging efficiency and equipment maintenance convenience during signal transmission, and at the same time eliminating the after-sales service problem caused by the inability to purchase the original model due to equipment discontinuation, so that the project transformation and upgrading does not need to completely replace the industrial computer, audio and video transmission equipment, display and audio, saving the cost of equipment upgrading. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 The present invention is a schematic diagram of the connection between an industrial computer, an extender, a display and a speaker in the prior art.

[0059] Figure 2 The diagram is a schematic diagram of an incompatible scenario between an extender and a display and a speaker in the prior art.

[0060] Figure 3 The figure is a schematic diagram of signal transmission of the audio and video transmission device suitable for railway environment according to the present invention.

[0061] Figure 4 It is a schematic diagram of an audio and video transmission device suitable for a railway environment according to a preferred embodiment of the present invention.

[0062] Figure 5 The figure is a schematic diagram of the audio and video transmission method suitable for railway environment according to the present invention.

[0063] Figure 6 This is a schematic diagram of an audio and video playback device suitable for a railway environment used in the present invention.

[0064] In the figure, 1-industrial computer, 2-transmitter, 3-receiver, 4-display, 5-external audio, 11-signal input terminal, 12-signal de-embedding conversion module, 13-signal encoding module, 14-signal embedding conversion module, 15-signal output terminal, 111-analog video signal input terminal, 112-digital video signal input terminal, 113-digital audio and video signal input terminal, 114-analog audio signal input terminal, 121-first conversion module, 122-first transmission module, 123-de-embedding module, 124-capture conversion module, 125-MS9288 chip, 126-S IL9135 chip, 127-PCM4201 chip, 131-video signal encoding module, 132-audio signal encoding module, 141-second conversion module, 142-second transmission module, 143-embedding module, 144-third conversion module, 145-MX9291 chip, 146-SIL9334 chip, 147-SIL9533 chip, 148-PCM1681 chip, 151-analog video signal output terminal, 152-digital video signal output terminal, 153-digital audio and video signal output terminal, 154-analog audio signal output terminal. DETAILED DESCRIPTION

[0065] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] like Figure 1 and Figure 2 As shown, in the prior art, when transmitting video signals and audio signals, the EDID protocol format supported by the display 4 and the audio is incompatible with the extender and the industrial computer 1, which mainly occurs in the following two scenarios:

[0069] In scenario A, the extender can transmit digital video signals and analog audio signals, and the signal receiving end (i.e., display 4 and speakers) is the display 4 with an HDMI port (High Definition Multimedia Port) with built-in speakers. At this time, since the HDMI port cannot directly read the analog audio signal, the analog audio signal cannot be transmitted to the built-in speakers of display 4 for use, which results in the built-in speakers of display 4 being unable to be used with older models of industrial computers or extenders.

[0070] In scenario B, the extender can transmit digital audio and video signals, and the signal receiving end is the DVI (digital video) port display 4 and the external speaker 5. At this time, since the DVI port of the display 4 cannot separate the digital audio and video signals into digital video signals and analog audio signals, the external speaker cannot be used normally.

[0071] In order to solve the problem of incompatibility between the display 4, audio and industrial computer 1 and extender in the prior art, in the first aspect, the present invention provides an audio and video transmission device suitable for a railway environment, which is used to transmit and convert the types of video signals and audio signals, so that the video signals and audio signals sent by the industrial computer 1 can be read by the display 4 and audio.

[0072] like Figure 3 , Figure 4 and Figure 6 As shown, the audio and video transmission device includes: a transmitting part and a receiving part, the transmitting part can receive video signals and audio signals, and the receiving part is connected to the transmitting part and can receive the video signals and audio signals sent by the transmitting part.

[0073] The transmitting unit 2 includes: a signal input terminal 11, a signal de-embedding conversion module 12, and a signal encoding module 13. The signal input terminal 11 can receive video signals and audio signals; the signal de-embedding conversion module 12 is connected to the signal input terminal 11, receives the video signals and audio signals forwarded by the signal input terminal 11, and converts the video signals and audio signals into digital video signals and digital audio signals respectively, so as to facilitate the unified encoding of the signals; the signal encoding module 13 is connected to the signal de-embedding conversion module 12, can receive the digital audio signals and digital video signals sent by the signal de-embedding conversion module 12, and uniformly encodes the signal formats of the digital audio signals and digital audio signals to generate audio fusion signals and video fusion signals.

[0074] The receiving unit 3 is connected to the transmitting unit 2, and can receive the audio fusion signal and the video fusion signal sent by the transmitting unit 2. The receiving unit 3 includes: a signal embedding conversion module 14 and a signal output terminal 15. The signal embedding conversion module 14 is connected to the signal encoding module 13, and can receive the audio fusion signal and the video fusion signal sent by the signal encoding module 13, and according to the type of the output signal required by the signal output terminal 15, control the video fusion signal and the audio fusion signal to be converted into the video signal and the audio signal required to be output by the signal output terminal 15.

[0075] The signal input terminal 11 is used to input video signals and audio signals. The input audio signals and video signals include: analog video signals, digital video signals, digital audio and video signals and analog audio signals; wherein the digital audio and video signals are digital video signals and their embedded analog audio signals, which can be separated into separated digital video signals and separated analog audio signals.

[0076] Specifically, the signal input terminal 11 includes: an analog video signal input terminal 111, a digital video signal input terminal 112, a digital audio and video signal input terminal 113 and an analog audio signal input terminal 114. The analog video signal input terminal 111 is used to input an analog video signal; the digital video signal input terminal 112 is used to input a digital video signal; the digital audio and video signal input terminal 113 is used to input a digital audio and video signal; the analog audio signal input terminal 114 is used to input an analog audio signal.

[0077] The signal de-embedding conversion module 12 is connected to the signal input terminal 11, and can receive the video signal and the audio signal transmitted by the signal input terminal 11; the signal conversion and de-embedding module 12 can convert the video signal into a digital video signal, and convert the audio signal into a digital audio signal; the signal conversion and de-embedding module 12 can de-embed the digital audio and video signal, and de-embed the digital audio and video signal into a digital video signal and a digital audio signal.

[0078] Specifically, Figure 3 As shown, the signal de-embedding conversion module 12 includes: a first conversion module 121, a first transmission module 122, a de-embedding module 123, and a collection conversion module 124. The first conversion module 121 is connected to the analog video signal input terminal 111, receives the analog video signal sent by the analog video signal input terminal 111, and converts the analog video signal from an analog signal to a digital signal to generate a digital video signal; the first conversion module 121 is connected to the signal encoding module 13, and transmits the digital video signal to the signal encoding module 13. The first transmission module 122 is connected to the digital video signal input terminal 112, receives the digital video signal transmitted by the digital video signal input terminal 112, and performs protocol analysis on the digital video signal to improve the signal transmission quality of the digital video signal; the first transmission module 122 is connected to the signal encoding module 13, and transmits the digital video signal to the signal encoding module 13. The de-embedding module 123 is connected to the digital audio and video signal input terminal 113, receives the digital audio and video signal transmitted by the digital audio and video signal input terminal 113, de-embeds the digital audio and video signal into a digital video signal and a digital audio signal, and performs protocol decoding on the digital video signal and the digital audio signal to ensure the effective transmission of the signal and improve the signal transmission quality; the de-embedding module 123 is connected to the signal encoding module 13, and transmits the digital video signal and the digital audio signal to the signal encoding module 13. The acquisition and conversion module 124 is connected to the analog audio signal input terminal 114, receives the analog audio signal transmitted by the analog audio signal input terminal 114; the acquisition and conversion module 124 acquires the analog audio signal, and converts the analog audio signal from an analog signal to a digital signal to generate a digital audio signal; the acquisition and conversion module 124 is connected to the signal encoding module 13, and transmits the digital audio signal to the signal encoding module 13.

[0079] In another preferred embodiment, Figure 4As shown, the first conversion module 121 in the signal de-embedding conversion module 12 is an MS9288 chip 125, and the MS9288 chip 125 is connected to the analog video signal input terminal 111, and can receive the analog video signal sent by the analog video signal input terminal 111, and convert the analog video signal into a digital video signal; the MS9288 chip 125 is connected to the signal encoding module 13, and transmits the digital video signal to the signal encoding module 13 through the TMDS standard signal (a technology for high-speed digital data serial transmission). The first transmission module 122 and the de-embedding module 123 are both SIL9135 chips 126. The SIL9135 chip 126 is connected to the digital video signal input terminal 112, and can receive the digital video signal sent by the digital video signal input terminal 112; the SIL9135 chip 126 is connected to the digital audio and video signal input terminal 113, receives the digital audio and video signal transmitted by the digital audio and video signal input terminal 113, and de-embeds the digital audio and video signal into a digital video signal and a digital audio signal; the SIL9135 chip 126 is connected to the signal encoding module 13, and transmits the digital video signal and the digital audio signal to the signal encoding module 13 through the high-speed digital data serial transmission technology. The acquisition conversion module 124 is a PCM4201 chip 127, which is connected to the analog audio signal input terminal 114, receives the analog audio signal transmitted by the analog audio signal input terminal 114, and converts the analog audio signal into a digital audio signal; the PCM4201 chip 127 is connected to the signal encoding module 13, and can transmit the digital audio signal to the signal encoding module 13 in the form of a TTL (transistor-transistor logic) signal.

[0080] The signal encoding module 13 is connected to the signal de-embedding conversion module 12, and receives the digital video signal and the digital audio signal sent by the signal de-embedding conversion module 12. The signal encoding module 13 adopts FPGA (field programmable gate array) technology to perform unified video encoding on the digital video signal to generate a video fusion signal, and to perform unified audio encoding on the digital audio signal to generate an audio fusion signal, so that the signal formats of the digital video signal and the digital audio signal are unified, so as to achieve compatibility with different types of video signals and audio signals.

[0081] Specifically, the signal encoding module 13 includes: a video signal encoding module 131 and an audio signal encoding module 132 . The video signal encoding module 131 is connected to the first conversion module 121, and can receive the digital video signal sent by the first conversion module 121; the video signal encoding module 131 is connected to the first transmission module 122, and can receive the digital video signal sent by the first transmission module 122; the video signal encoding module 131 is connected to the de-embedding module 123, and can receive the digital video signal sent by the de-embedding module 123; the video signal encoding module 131 can perform unified video encoding on the digital video signal, generate a video fusion signal, and make the format of the video signal input by the signal input terminal 11 of different signal types unified; the audio signal encoding module 132 is connected to the de-embedding module 123, and can receive the digital audio signal sent by the de-embedding module 123; the audio signal encoding module 132 is connected to the acquisition conversion module 124, and can receive the digital audio signal sent by the acquisition conversion module 124; the audio signal encoding module 132 can perform unified audio encoding on the digital audio signal, and generate an audio fusion signal, and make the format of the audio signal input by the signal input terminal 11 of different signal types unified.

[0082] The signal embedding conversion module 14 is connected to the signal encoding module 13, and can receive the video fusion signal and the audio fusion signal sent by the signal encoding module 13. The signal embedding conversion module 14 is an HDMI port processor, which can provide high-speed signal processing and switching functions, can convert the video fusion signal into an analog video signal, convert the audio fusion signal into an analog audio signal, and embed the video fusion signal and the audio fusion signal into a digital audio and video signal.

[0083] Specifically, the signal embedding conversion module 14 includes: a second conversion module 141, a second transmission module 142, an embedding module 143 and a third conversion module 144. The second conversion module 141 is connected to the video signal encoding module 131, and can receive the video fusion signal sent by the video signal encoding module 131, and convert the video fusion signal from a digital signal to an analog signal to generate an analog video signal. The second transmission module 142 is connected to the video signal encoding module 131, receives the video fusion signal sent by the video signal encoding module 131, and uses the video fusion signal as a digital video signal. The embedding module 143 is connected to the audio signal encoding module 132, and can receive the audio fusion signal sent by the audio signal encoding module 132; the embedding module 143 is connected to the video signal encoding module 131, and can receive the video fusion signal sent by the video signal encoding module 131; the embedding module 143 can embed the video fusion signal and the audio fusion signal to generate a digital audio and video signal. The third conversion module 144 is connected to the audio signal encoding module 132 and can receive the audio fusion signal sent by the audio signal encoding module 132; the third conversion module 144 can convert the audio fusion signal from a digital signal to an analog signal to generate an analog audio signal.

[0084] The signal embedding conversion module 14 can control the conversion of the audio signal and the video signal according to the signal type to be output by the signal output terminal 15. When the digital audio and video signal to be transmitted is a mixed signal of a digital video signal and an analog audio signal, and the display 4 has a built-in speaker, the display 4 can read the video signal and the audio signal at the same time (i.e., in Figure 2 In the middle scene A), at this time, the signal embedding conversion module 14 generates a digital audio and video signal through the embedding module 143, and converts the digital audio and video signal through the receiving unit 3, and sends it to the display 4, so that the display 4 can read the digital audio and video signal, solving the problem. Figure 2 In the middle scene A, the display 4, the audio and the industrial computer 1, the audio and video transmission equipment are incompatible. When a digital audio and video signal with an embedded audio signal needs to be transmitted, and the display 4 does not have a built-in audio, the display 4 cannot read the video signal and the audio signal at the same time (i.e., in Figure 2 In the middle scene B), at this time, the embedding module 143 uses the audio fusion signal as a digital audio signal, or generates an analog audio signal through the third conversion module 144, and uses the video fusion signal as a digital video signal, and sends the video signal and the audio signal to the display 4 and the external speaker 5 respectively through the receiving unit 3 of the audio and video transmission device, solving the problem of Figure 2In the middle scene B, the display 4, the audio, the industrial computer 1, and the audio and video transmission equipment are incompatible. When transmitting digital video signals, analog video signals, and analog audio signals, the signal types of the video signals and the audio signals can also be changed by the signal embedding conversion module 14 according to the signal type required to be output by the signal output end, so that the video signals and the audio signals can be read by the display 4 and the audio, and the display 4, the audio, the industrial computer 1, and the audio and video transmission equipment are compatible.

[0085] In a preferred embodiment, the second transmission module 142 can be omitted from the signal embedding conversion module 14, and the video fusion signal can be directly transmitted as a digital video signal.

[0086] In another preferred embodiment, Figure 4 As shown, the second conversion module 141 is an MX9291 chip 145, which is connected to the video signal encoding module 131 and can receive the video fusion signal sent by the video signal encoding module 131, and convert the video fusion signal from a digital signal to an analog signal to generate an analog video signal. The embedding module 143 includes: a SIL9334 chip 146 and a SIL9533 chip 147. The SIL9334 chip 146 is connected to the video signal encoding module 131 and can receive the video fusion signal sent by the video signal encoding module 131; the SIL9334 chip 146 is connected to the audio signal encoding module 132 and can receive the audio fusion signal sent by the audio signal encoding module 132; the SIL9334 chip 146 can embed the audio fusion signal and the video fusion signal to generate a digital audio and video signal. The SIL9533 chip 147 is connected to the video signal encoding module 131, and can receive the video fusion signal sent by the video signal encoding module 131, and convert the video fusion signal into a digital video signal; the SIL9533 chip 147 is connected to the audio signal encoding module 132, and can receive the audio fusion signal sent by the audio signal encoding module 132, and convert the audio fusion signal into a digital audio signal, which is suitable for the display 4 without built-in audio or the multi-channel audio signal (that is, the digital audio and video signal needs to be de-embedded and then transmitted). The third conversion module 144 is a PCM1681 chip 148, and the PCM1681 chip 148 is connected to the audio signal encoding module 132, and can receive the audio fusion signal sent by the audio signal encoding module 132, and convert the audio fusion signal from a digital signal to an analog signal to generate an analog audio signal.

[0087] The signal output terminal 15 includes: an analog video signal output terminal 151, a digital video signal output terminal 152, a digital audio and video signal output terminal 153, and an analog audio signal output terminal 154. The analog video signal output terminal 151 is connected to the second conversion module 141, and can receive and transmit the analog video signal sent by the second conversion module 141; the digital video signal output terminal 152 is connected to the second transmission module 142, and can receive and transmit the digital video signal sent by the second transmission module 142; the digital audio and video signal output terminal 153 is connected to the embedding module 143, and can receive and transmit the digital audio and video signal sent by the embedding module 143; the analog audio signal output terminal 154 is connected to the third conversion module 144, and can receive and transmit the analog audio signal sent by the third conversion module 144.

[0088] In one embodiment, the audio and video transmission device also includes: an output port, which is arranged on the receiving part and is used to insert a video cable and an audio cable so as to output video signals and audio signals to the display 4 and the audio, and the output port of the receiving part 3 can be selected according to the needs of the display 4 and the audio; the output port includes: a VGA (video graphics array) port, a DVI (digital video) port, an HDMI (high-definition multimedia) port, and an audio port; the VGA port matches the analog video signal output terminal 151, the DVI port matches the digital video signal output terminal 152, the HDMI port matches the digital audio and video signal output terminal 153, and the audio port matches the analog audio signal output terminal 154.

[0089] Furthermore, in order to achieve high-quality transmission of video signals and audio signals during long-distance transmission, the audio and video transmission device further includes: an optical-to-electrical converter, and the signal transmission between the transmitting unit 2 and the receiving unit 3 is performed via an optical fiber cable. The optical-to-electrical converter converts the video fusion signal and the audio fusion signal at the signal sending end of the transmitting unit 2 from electrical signals to optical signals, so that the video fusion signal and the audio fusion signal can be transmitted long-distance via an optical fiber cable; the optical-to-electrical converter converts the video fusion signal and the audio fusion signal at the signal receiving end of the receiving unit 3 from optical signals to electrical signals, so as to facilitate further processing of the video fusion signal and the audio fusion signal, and realize the conversion of the signal types of the video signal and the audio signal.

[0090] Second, as Figure 6As shown, the present invention provides an audio and video playback device suitable for a railway environment, comprising: an industrial computer 1, the above-mentioned audio and video transmission device and an external device. The industrial computer 1 is capable of sending video signals and audio signals; the audio and video transmission device is connected to the industrial computer 1, and is capable of receiving the video signals and audio signals sent by the industrial computer 1, and converting the video signals and audio signals into the video signals and audio signals required to be input by the signal output end through the audio and video transmission device. The external device comprises: a display 4 and an external speaker 5, the display 4 is connected to the audio and video transmission device, and is capable of receiving the video signals (including: analog video signals, digital video signals, digital audio and video signals) transmitted by the audio and video transmission device; the external speaker 5 is connected to the audio and video transmission device via an audio line, and is capable of receiving the audio signals (including: analog audio signals, digital audio signals) sent by the audio and video transmission device.

[0091] Furthermore, the signal input terminal 11 on the transmitting unit 2 is connected to the industrial computer 1 , and the signal output terminal of the receiving unit 3 is connected to the display 4 and the external audio 5 .

[0092] In a preferred embodiment, the display 4 is provided with a built-in audio interface and a built-in speaker, so that the display 4 can receive all types of output signals. In this case, it is not necessary to connect the receiving unit 3 to the external speaker 5 .

[0093] In a preferred embodiment, the video cable with a built-in audio cable is an HDMI video cable with a built-in audio cable.

[0094] Thirdly, Figure 5 As shown, the present invention provides an audio and video transmission method suitable for railway environment, based on the audio and video transmission device of the present invention, for extracting features, uniformly encoding and converting signal types of video signals and audio signals. The specific steps include:

[0095] Step 1: perform signal polling and signal initialization at the signal input end.

[0096] The signal input terminal 11 checks whether there is a signal input to complete the signal polling; at the same time, it is confirmed whether the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal to complete the signal initialization. If the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal, it means that the signal initialization is completed; otherwise, the signal input terminal 11 will re-perform the signal polling.

[0097] Step 2: The signal de-embedding conversion module performs signal feature pre-reading.

[0098] The signal de-embedding conversion module 12 receives the video signal and the audio signal sent by the signal input terminal 11, and determines the types of the video signal and the audio signal.

[0099] Step 3: The signal de-embedding conversion module performs signal sampling.

[0100] The signal de-embedding conversion module 12 performs signal acquisition according to the types of the video signal and the audio signal in step 2.

[0101] Step 3.1: The signal de-embedding conversion module determines whether the acquired signal can be de-embedded.

[0102] When the signal received by the signal de-embedding conversion module 12 is a digital audio and video signal, the digital audio and video signal is de-embedded to be a digital audio signal and a digital video signal; when the signal received by the signal de-embedding conversion module 12 is not a digital audio and video signal, the received signal is directly digitized and converted into a digital signal.

[0103] Step 3.2, performing unified coding processing on the signal obtained in step 3.1.

[0104] When the signal received by the signal de-embedding conversion module 12 is not a digital audio or video signal, the signal encoding module 13 receives the signal and performs unified encoding processing on the digital audio signal or digital video signal obtained in step 3.1 to convert the digital audio signal into an audio fusion signal, or convert the digital video signal into a video fusion signal.

[0105] When the signal received by the signal de-embedding conversion module 12 is a digital audio and video signal, the signal encoding module 13 receives the signal and performs unified encoding processing on the digital audio signal and digital video signal obtained by de-embedding in step 3.1, so that the digital audio signal is converted into an audio fusion signal, and the digital video signal is converted into a video fusion signal.

[0106] Step 4: The signal embedding conversion module performs signal mixing coding.

[0107] When the signal received by the signal de-embedding conversion module 12 is not a digital audio and video signal, the signal de-embedding conversion module 12 can convert the video fusion signal and the audio fusion signal into the video signal and audio signal required to be output by the signal output terminal 15 according to the type of signal required to be output by the signal output terminal.

[0108] When the signal received by the signal de-embedding conversion module 12 is a digital audio and video signal, and the signal output terminal 15 is a digital audio and video output terminal, the signal embedding conversion module 14 embeds the video fusion signal and the audio fusion signal to complete the mixed encoding of the video signal and the audio signal to generate a digital audio and video signal.

[0109] When the signal received by the signal de-embedding conversion module 12 is a digital audio and video signal, and the signal output terminal 15 is not a digital audio and video output terminal, and the display 4 cannot read the audio signal and the video signal at the same time, the signal embedding conversion module 14 converts the video fusion signal into a digital video signal, and converts the audio fusion signal into a digital audio signal, so that the digital video signal and the digital audio signal can be read by the display 4 and the audio respectively.

[0110] Step 5: output the signal from the signal output terminal.

[0111] Embodiment 1

[0112] like Figure 5 As shown, when the signal input terminal 11 receives an analog audio signal, the signal input terminal 11 sends the analog audio signal to the signal de-embedding conversion module 12 .

[0113] Step A1, signal polling and signal initialization are performed by the signal input terminal.

[0114] The signal input terminal 11 continuously checks whether there is a signal input to complete signal polling; at the same time, it is confirmed whether the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal to complete signal initialization. If the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal, it means that the signal initialization is completed; otherwise, the signal input terminal 11 will re-perform signal polling.

[0115] Step A2: The signal de-embedding conversion module performs signal feature pre-reading.

[0116] The signal de-embedding conversion module 12 receives the video signal and the audio signal sent by the signal input terminal 11, and determines the types of the video signal and the audio signal.

[0117] Step A3: The signal de-embedding conversion module performs signal sampling.

[0118] Step A3.1: The signal de-embedding conversion module determines whether the signal can be de-embedded.

[0119] When the signal de-embedding conversion module 12 determines that the acquired signal is an analog audio signal, the analog audio signal cannot be de-embedded.

[0120] Step A3.2, processing the signal obtained in step A3.1.

[0121] The signal de-embedding conversion module 12 collects the analog audio signal sent by the signal input terminal 11, and converts the analog audio signal from an analog signal to a digital signal to generate a digital audio signal. The audio signal encoding module 132 performs unified audio encoding processing such as noise reduction, signal amplification, compression and decompression on the digital audio signal to generate an audio fusion signal, and caches the audio fusion signal.

[0122] Step A4: the signal embedding conversion module performs signal mixing coding.

[0123] Since the analog audio signal cannot be embedded, the signal embedding conversion module 14 converts the audio fusion signal obtained in step A3.2 into the audio signal required to be output by the signal output terminal 15.

[0124] Step A5: output the signal from the signal output terminal.

[0125] The audio signal is outputted from the signal output terminal 15 .

[0126] Embodiment 2

[0127] like Figure 5 As shown, when the signal input terminal 11 receives a digital video signal, the signal input terminal 11 sends the digital video signal to the signal de-embedding conversion module 12 .

[0128] Step B1, signal polling and signal initialization are performed by the signal input terminal.

[0129] The signal input terminal continuously checks whether there is a signal input to complete signal polling; at the same time, it confirms whether the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal to complete signal initialization. If the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal, it means that the signal initialization is completed; otherwise, the signal input terminal 11 will re-perform signal polling.

[0130] Step B2: Pre-reading of signal characteristics by the signal de-embedding conversion module.

[0131] The signal de-embedding conversion module 12 receives the video signal and the audio signal sent by the signal input terminal 11, and determines the types of the video signal and the audio signal.

[0132] Step B3: The signal de-embedding conversion module performs signal sampling.

[0133] Step B3.1: The signal de-embedding conversion module determines whether the signal can be de-embedded.

[0134] When the signal de-embedding conversion module 12 determines that the acquired signal is a digital video signal, the digital video signal cannot be de-embedded.

[0135] Step B3.2, processing the signal obtained in step B3.1.

[0136] The signal de-embedding conversion module 12 collects the digital video signal, and the video signal encoding module 131 reads the image information of the image ratio, image refresh rate, and image resolution contained in the digital video signal, compresses the image information, completes the unified video encoding processing of the image information, and converts the digital video signal into a video fusion signal, saving the transmission time and storage space of the image information, and improving the efficiency and performance of the image information processing.

[0137] Step B4: the signal embedding conversion module performs signal mixing encoding.

[0138] Since the digital video signal cannot be de-embedded, the signal embedding conversion module 14 converts the video fusion signal into a video signal required to be output by the signal output terminal 15 .

[0139] Step B5, outputting the signal from the signal output terminal.

[0140] The video signal is output from the signal output terminal 15 .

[0141] Embodiment 3

[0142] like Figure 5 As shown, when the signal input terminal 11 receives a digital audio and video signal, the signal input terminal 11 sends the digital audio and video signal to the signal de-embedding conversion module 12 .

[0143] Step C1, signal polling and signal initialization are performed by the signal input terminal.

[0144] The signal input terminal 11 continuously checks whether there is a signal input to complete signal polling; at the same time, it is confirmed whether the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal to complete signal initialization. If the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal, it means that the signal initialization is completed; otherwise, the signal input terminal 11 will re-perform signal polling.

[0145] Step C2: Pre-reading of signal characteristics by the signal de-embedding conversion module.

[0146] The signal de-embedding conversion module 12 receives the video signal and the audio signal sent by the signal input terminal 11, and determines the types of the video signal and the audio signal.

[0147] Step C3: the signal de-embedding conversion module performs signal sampling.

[0148] Step C3.1: The signal de-embedding conversion module determines whether the signal can be de-embedded.

[0149] When the signal de-embedding conversion module 12 determines that the acquired signal is a digital audio and video signal, the digital audio and video signal can be separated.

[0150] Step C3.2, processing the signal obtained in step C3.1.

[0151] The signal de-embedding conversion module 12 collects digital audio and video signals, and de-embeds the digital audio and video signals to obtain digital video signals and digital audio signals.

[0152] When processing the digital video signal, repeat step B3.2 in Example 2, and the video signal encoding module 131 reads the image information of the image ratio, image refresh rate, and image resolution contained in the digital video signal, and compresses the image information to complete the unified video encoding processing of the image information, so that the digital video signal is converted into a video fusion signal.

[0153] When processing the digital audio signal, repeat step A3.2 in Example 1, and the audio signal encoding module 132 performs unified audio encoding processing of noise reduction, signal amplification, compression and decompression on the digital audio signal to generate an audio fusion signal, and cache the audio fusion signal.

[0154] Step C4: the signal embedding conversion module performs signal mixing coding.

[0155] Since digital audio and video signals can be de-embedded, when the signal output terminal 15 is a digital audio and video output terminal, the video fusion signal and the audio fusion signal in step C3.2 can be mixed and encoded to form a digital audio and video signal; at this time, the display 4 has a built-in speaker, which can read the audio signal and the video signal at the same time. When the signal output terminal 15 is not a digital audio and video output terminal, the video fusion signal in step C3.2 is converted into the video signal required to be output by the signal output terminal, which is used to be transmitted to the display 4 for reading; the audio fusion signal is converted into the audio signal required to be output by the signal output terminal, which is used to be transmitted to the speaker for reading; at this time, the display 4 does not have a built-in speaker, and an external speaker needs to be set up to read the video signal and the audio signal respectively.

[0156] Step C5, outputting the signal from the signal output terminal.

[0157] The signal in step C4 is outputted from the signal output terminal 15 .

[0158] Embodiment 4

[0159] like Figure 5 As shown, when the signal input terminal 11 receives an analog video signal, the signal input terminal 11 sends the analog video signal to the signal de-embedding conversion module 12 .

[0160] Step D1, signal polling and signal initialization are performed by the signal input terminal.

[0161] The signal input terminal 11 continuously checks whether there is a signal input to complete signal polling; at the same time, it is confirmed whether the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal to complete signal initialization. If the signal input terminal 11 and the signal de-embedding conversion module 12 can transmit the signal, it means that the signal initialization is completed; otherwise, the signal input terminal 11 will re-perform signal polling.

[0162] Step D2: Pre-reading of signal characteristics by the signal de-embedding conversion module.

[0163] The signal de-embedding conversion module 12 receives the video signal and the audio signal sent by the signal input terminal 11, and determines the types of the video signal and the audio signal.

[0164] Step D3: The signal de-embedding conversion module performs signal sampling.

[0165] Step D3.1, the signal de-embedding conversion module determines whether the signal can be de-embedded.

[0166] When the signal de-embedding conversion module 12 determines that the acquired signal is an analog video signal, the analog video signal cannot be de-embedded.

[0167] Step D3.2, processing the signal obtained in step D3.1.

[0168] The signal de-embedding conversion module 12 collects analog video signals, reads image information such as image ratio, image refresh rate, and image resolution contained in the analog video signals, converts the collected analog video signals from analog signals to digital signals, and generates digital video signals.

[0169] The video signal encoding module 131 repeats step B3.2 for the digital video signal, reads the image information of the image ratio, image refresh rate, and image resolution contained in the digital video signal, compresses the image information, completes the unified video encoding processing of the image information, and converts the digital video signal into a video fusion signal.

[0170] Step D4, the signal embedding conversion module performs signal mixing coding.

[0171] Since the analog video signal cannot be de-embedded, the signal embedding conversion module 14 converts the video fusion signal into a video signal required to be output by the signal output terminal 15 .

[0172] Step D5, outputting a signal from the signal output terminal.

[0173] The video signal is output from the signal output terminal 15 .

[0174] To sum up, the audio and video transmission equipment described in the present invention converts the acquired video signals and audio signals into output signals that can be read by displays and speakers, and all types of signals can be converted according to the output signal type required by the signal output terminal, thereby achieving compatibility between different industrial computers, audio and video transmission equipment and displays, and speakers; further, the audio and video transmission method described in the present invention converts the video signals and audio signals to be transmitted into output signals that can be read by displays and speakers according to the ability of displays and speakers to read signal types, thereby achieving mutual conversion between diversified interface protocols, so that the audio and video transmission equipment described in the present invention can be matched with any industrial computers, displays and audio equipment, thereby improving the debugging efficiency of audio and video transmission equipment and the convenience of equipment maintenance.

[0175] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. An audio and video transmission device suitable for railway environment, characterized in that: include: A transmitting unit and a receiving unit, wherein the transmitting unit and the receiving unit perform signal transmission; The transmitting unit comprises: Signal input terminal, used for inputting video signal and audio signal; A signal de-embedding conversion module, connected to the signal input terminal, for de-embedding the digital audio and video signal input from the signal input terminal into a digital video signal and a digital audio signal, converting the analog video signal into a digital video signal for output, and converting the analog audio signal into a digital audio signal for output; A signal encoding module, connected to the signal de-embedding conversion module, for uniformly encoding the digital video signal and the digital audio signal output by the signal de-embedding conversion module to obtain a video fusion signal and an audio fusion signal output; The receiving unit comprises: A signal embedding conversion module, connected to the signal encoding module, configured to embed the video fusion signal and the audio fusion signal output by the signal encoding module into a digital audio and video signal, convert the video fusion signal into an analog video signal, and convert the audio fusion signal into an analog audio signal; The signal output terminal is connected to the signal embedding conversion module and is used to output video signals and audio signals.

2. The audio and video transmission device suitable for railway environment according to claim 1, characterized in that: The signal input terminal includes: an analog video signal input terminal, a digital video signal input terminal, a digital audio and video signal input terminal, and an analog audio signal input terminal; The signal de-embedding conversion module comprises: A first conversion module, which is connected to the analog video signal input terminal, receives the analog video signal sent by the analog video signal input terminal, and converts the analog video signal from an analog signal to a digital signal to generate a digital video signal; the first conversion module is connected to the signal encoding module, and transmits the digital video signal to the signal encoding module; A first transmission module, which is connected to the digital video signal input terminal, receives the digital video signal sent by the digital video signal input terminal, and is capable of transmitting the digital video signal; the first transmission module is connected to the signal encoding module, and transmits the digital video signal to the signal encoding module; a de-embedding module, which is connected to the digital audio and video signal input terminal, receives the digital audio and video signal transmitted by the digital audio and video signal input terminal, and de-embeds the digital audio and video signal into a digital video signal and a digital audio signal; the de-embedding module is connected to the signal encoding module, and transmits the digital video signal and the digital audio signal to the signal encoding module; The acquisition and conversion module is connected to the analog audio signal input terminal, receives the analog audio signal transmitted by the analog audio signal input terminal, and converts the analog audio signal from an analog signal to a digital signal to generate a digital audio signal; the acquisition and conversion module is connected to the signal encoding module, and transmits the digital audio signal to the signal encoding module.

3. The audio and video transmission device suitable for railway environment according to claim 2, characterized in that: The signal encoding module includes: a video signal encoding module and an audio signal encoding module; The video signal encoding module is connected to the first conversion module to receive the digital video signal sent by the first conversion module; the video signal encoding module is connected to the first transmission module to receive the digital video signal sent by the first encoding module; the video signal encoding module is connected to the de-embedding module to receive the digital video signal sent by the de-embedding module; the video signal encoding module can perform unified video encoding on the digital video signal to generate a video fusion signal; The audio signal encoding module is connected to the de-embedding module to receive the digital audio signal sent by the de-embedding module; the audio signal encoding module is connected to the acquisition conversion module to receive the digital audio signal sent by the audio signal encoding module; the audio signal encoding module can perform unified audio encoding on the digital audio signal to generate an audio fusion signal.

4. The audio and video transmission device suitable for railway environment according to claim 3, characterized in that: The signal output terminal includes: an analog video signal output terminal, a digital video signal output terminal, a digital audio and video signal output terminal, and an analog audio signal output terminal; The signal embedding conversion module comprises: A second conversion module, which is connected to the video signal encoding module, receives the video fusion signal sent by the video signal encoding module, and converts the video fusion signal from a digital signal to an analog signal to generate an analog video signal; the second conversion module is connected to the analog video signal output terminal, and sends the analog video signal to the analog video signal output terminal; A second transmission module, which is connected to the video signal encoding module, receives the video fusion signal sent by the video signal encoding module, and uses the video fusion signal as a digital video signal; the second transmission module is connected to the digital video signal output terminal, and sends the digital video signal to the digital video signal output terminal; An embedding module, which is connected to the video signal encoding module and can receive the video fusion signal sent by the video signal encoding module; the embedding module is connected to the audio signal encoding module and can receive the audio fusion signal sent by the audio signal encoding module; the embedding module can embed the audio fusion signal and the video fusion signal to generate a digital audio and video signal; the embedding module is connected to the digital audio and video signal output terminal and sends the digital audio and video signal to the digital audio and video signal output terminal; The third conversion module is connected to the audio signal encoding module, capable of receiving the audio fusion signal sent by the audio signal encoding module, and converting the audio fusion signal from a digital signal to an analog signal to generate an analog audio signal; the third conversion module is connected to the analog audio signal output terminal, and sends the analog audio signal to the analog audio signal output terminal.

5. An audio and video playback device suitable for railway environment, characterized in that: include: The audio and video transmission equipment suitable for railway environment as described in claims 1-4, as well as the industrial computer, the display and the external speakers; The industrial computer is used to send video signals and audio signals; The audio and video transmission device is connected to the industrial computer, receives the video signal and audio signal sent by the industrial computer, and converts the video signal and audio signal into the video signal and audio signal required to be output by the signal output end; The display is connected to the audio and video transmission device and can receive the video signal and audio signal transmitted by the audio and video transmission device; The external speaker is connected to the audio and video transmission device via an audio cable and can receive the audio signal transmitted by the audio and video transmission device.

6. An audio and video transmission method suitable for railway environment, implemented based on the audio and video transmission device suitable for railway environment as described in claims 1-4, characterized in that: The audio and video transmission method comprises: The signal input terminal obtains the video signal and the audio signal through signal polling, and the signal de-embedding conversion module determines whether the obtained signal is a digital audio and video signal; When the acquired signal is not a digital audio and video signal, the signal de-embedding conversion module converts the video signal into a digital video signal and converts the audio signal into a digital audio signal; When the acquired signal is a digital audio and video signal, the signal de-embedding conversion module de-embeds the digital audio and video signal into a digital audio signal and a digital video signal; The signal encoding module uniformly encodes the digital video signal to generate a video fusion signal, and uniformly encodes the digital audio signal to generate an audio fusion signal; and the signal embedding conversion module converts the video fusion signal and the audio fusion signal into the video signal and audio signal required to be output by the signal output end according to the type of output signal required by the signal output end.

7. The audio and video transmission method suitable for railway environment according to claim 6, characterized in that: When the acquired signal is an analog audio signal, the signal de-embedding conversion module converts the analog audio signal into a digital audio signal; and the audio signal encoding module performs unified audio encoding on the digital audio signal to generate an audio fusion signal, and then the signal embedding conversion module converts the audio fusion signal into the audio signal required to be output by the signal output end.

8. The audio and video transmission method suitable for railway environment according to claim 6, characterized in that: When the acquired signal is a digital video signal, the signal de-embedding conversion module transmits the digital video signal; the video signal encoding module performs unified video encoding on the digital video signal to generate a video fusion signal, and then the signal embedding conversion module converts the video fusion signal into a video signal required to be output by the signal output terminal; The method for performing unified video encoding on the digital video signal to generate a video fusion signal includes: The video signal encoding module reads the image information of image ratio, image refresh rate and image resolution contained in the digital video signal, performs unified video encoding processing on the image information, and converts the digital video signal into a video fusion signal.

9. The audio and video transmission method suitable for railway environment according to claim 6, characterized in that: When the acquired signal is an analog video signal, the signal de-embedding conversion module converts the analog video signal into a digital video signal; and the video signal encoding module performs unified video encoding on the digital video signal to generate a video fusion signal, and then the signal embedding conversion module converts the video fusion signal into a video signal required to be output by the signal output terminal; The method of converting the analog video signal into a digital video signal by the signal de-embedding conversion module includes: The signal de-embedding conversion module reads the image information including the image ratio, image refresh rate and image resolution in the analog video signal, converts the analog video signal from an analog signal to a digital signal, and generates a digital video signal.

10. The audio and video transmission method suitable for railway environment according to claim 9, characterized in that: The method for generating a video fusion signal by performing unified video encoding on a digital video signal comprises: The video signal encoding module reads the image information of image ratio, image refresh rate and image resolution contained in the digital video signal, performs unified video encoding on the image information, and converts the digital video signal into a video fusion signal.

11. The audio and video transmission method suitable for railway environment according to claim 6, characterized in that: When the acquired signal is a digital audio and video signal, the signal de-embedding conversion module de-embeds the digital audio and video signal into a digital video signal and a digital audio signal; the video signal encoding module performs unified video encoding on the digital video signal to generate a video fusion signal, and the audio signal encoding module performs unified audio encoding on the digital audio signal to generate an audio fusion signal; The signal embedding conversion module converts the video fusion signal and the audio fusion signal into the video signal and the audio signal required to be output by the signal output terminal; The method for performing unified video encoding on the digital video signal to generate a video fusion signal includes: The video signal encoding module reads the image information of image ratio, image refresh rate and image resolution contained in the digital video signal, performs unified video encoding on the image information, and converts the digital video signal into a video fusion signal.

12. The audio and video transmission method suitable for railway environment according to claim 11, characterized in that: The method of converting the video fusion signal and the audio fusion signal into the video signal and the audio signal required to be output by the signal output terminal by the signal embedding conversion module includes: When the signal output terminal is a digital audio and video signal output terminal, the signal embedding conversion module embeds the video fusion signal and the audio fusion signal to generate a digital audio and video signal; When the signal output end is not a digital audio and video signal output, the signal embedding conversion module converts the video fusion signal into a video signal required to be output by the signal output end, and converts the audio fusion signal into an audio signal required to be output by the signal output end.

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