CN111447477A - Coaxial bidirectional video-on-demand system for ships - Google Patents
Coaxial bidirectional video-on-demand system for ships Download PDFInfo
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- CN111447477A CN111447477A CN202010272680.8A CN202010272680A CN111447477A CN 111447477 A CN111447477 A CN 111447477A CN 202010272680 A CN202010272680 A CN 202010272680A CN 111447477 A CN111447477 A CN 111447477A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/214—Specialised server platform, e.g. server located in an airplane, hotel, hospital
- H04N21/2146—Specialised server platform, e.g. server located in an airplane, hotel, hospital located in mass transportation means, e.g. aircraft, train or bus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
- H04N21/2187—Live feed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
- H04N7/104—Switchers or splitters
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Databases & Information Systems (AREA)
- Details Of Television Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention provides a ship coaxial bidirectional video-on-demand system, which comprises: the system comprises a video on demand extension, a television signal gain unit, a splitter and a plurality of set top boxes; the video-on-demand extension set is connected with the television signal gain unit, the television signal gain unit is connected with the splitter, the splitter is connected with the set top boxes, and the video-on-demand extension set, the television signal gain unit, the splitter and the set top boxes are connected through coaxial cables; when a user requests a television program, the VOD extension receives a request instruction and transmits the requested video/audio signal and the satellite television program to the television signal gain unit through the coaxial cable, and then the video/audio signal and the satellite television program are distributed to the television of the user through the branching unit and the set top box, so that the defect that the user watches the video requested program due to network faults and bandwidth limitation is effectively avoided, and the safety of a video requested program system is ensured due to the use of a single coaxial network.
Description
Technical Field
The invention relates to the field of video application, in particular to a ship coaxial bidirectional video-on-demand system.
Background
With the increase of the number of large-scale ship on-demand users and the successive promotion of high-quality video on-demand programs such as high-definition 2k, high-definition 4k, blue light and the like, the storage space occupied by video on-demand services and the network bandwidth demand are larger and larger. In the special application environment of ships, the network transmission bandwidth is limited, the network environment is complex, the closed circuit television with the conventional network architecture cannot meet the increasing demand of video service development, and the number of the on-demand users is limited.
On the current ships, most of video-on-demand systems are IP network video-on-demand systems, the system is greatly influenced by network bandwidth and has small capacity, networks on a plurality of digital ships are public networks, a plurality of devices run on the networks, the safety of the networks has great hidden danger, and network faults occur at times. And a video system for playing videos on ships by adopting a coaxial network has no on-demand function and can only play live television programs.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a ship coaxial bidirectional video-on-demand system.
The purpose of the invention is realized by the following technical scheme: a ship coaxial bi-directional video-on-demand system comprising: the system comprises a video on demand extension, a television signal gain unit, a splitter and a plurality of set top boxes;
the video-on-demand extension set is connected with the television signal gain unit, the television signal gain unit is connected with the splitter, the splitter is connected with the set top boxes, and the video-on-demand extension set, the television signal gain unit, the splitter and the set top boxes are connected through coaxial cables;
the video-on-demand extension set is used for receiving video-on-demand instructions sent by the set top boxes, receiving video/audio signals and satellite television programs according to the video-on-demand instructions, and sending the video/audio signals and the satellite television programs corresponding to the video-on-demand instructions to the television signal gain unit;
the television signal gain unit is used for performing power amplification on the received video/audio signal and the satellite television program and sending the signals to a corresponding set top box in the plurality of set top boxes through the splitter;
the set-top box is used for demodulating the video/audio signal and the satellite television program and sending the video/audio signal and the satellite television program to the television.
The invention has the advantages that the video-on-demand extension, the television signal gain unit, the splitter and the set top boxes are all connected through coaxial cables, the number of the set top boxes is at least two, a video-on-demand system based on the coaxial cables is designed, the capacity is large, the bandwidth is large, when a user requests a television program, on-demand information is sent out through the set top boxes, the video-on-demand extension receives an on-demand instruction and transmits the on-demand video/audio signal and the satellite television program to the television signal gain unit through the coaxial cables, and the television signal gain unit distributes the signal to the television of the user through the splitter and the set top boxes after power amplification. The method effectively avoids the defect that the watching of the video-on-demand program is influenced by a user due to network faults, bandwidth limitation or incapability of arranging an IP network, expands the use scene of the video-on-demand system, and ensures the safety of the video-on-demand system due to the use of a single coaxial network.
Further, the video-on-demand extension comprises a coding modulation device, a first mixer, a first distributor, an on-demand management server, a switch and a first high-definition gateway;
the switch is respectively connected with the on-demand management server, the first high-definition gateway and the coding modulation equipment;
the code modulation device, the first mixer, the first distributor and the first high-definition gateway are sequentially connected through coaxial cables, and the output end of the first high-definition gateway is connected with the television signal gain unit through the coaxial cables.
The set top box initiates connection service to the video-on-demand extension set through a coaxial network, a first high-definition gateway in the video-on-demand extension set converts coaxial signals into network signals and transmits the network signals to a video-on-demand management server, on-demand software in the video-on-demand management server gives authorization to the set top box, a coding modulator receives video/audio signals, codes and modulates the video/audio signals and sends the video/audio signals to a first mixer, the first mixer receives the coded and modulated video/audio signals and two paths of radio frequency signals of satellite television programs, the two paths of radio frequency signals are combined and then sent to a first distributor in a unified mode, the first distributor outputs the received signals to the first high-definition gateway in a multi-path lossless mode, and the signals are amplified in power through a television signal gain unit and then are distributed to a television of.
Further, the first high-definition gateway comprises a first gateway device and a second mixer, the first gateway device is connected with the first distributor, the second mixer and the switch respectively, and the output end of the second mixer is connected with the television signal gain unit through a coaxial cable.
The beneficial effect of adopting above-mentioned further scheme is that, first high definition gateway includes first gateway equipment and second blender, and first gateway equipment converts the network signal transmission of switch into the signal that can transmit on coaxial cable to be provided with the second blender, mix video/audio signal, satellite television program two way radio frequency signal and the network signal of switch transmission.
Furthermore, the television signal gain unit also comprises a second distributor, wherein the input end of the second distributor is connected with the second mixer, and the output end of the second distributor is connected with a plurality of television signal gain units.
The beneficial effect of adopting the above further scheme is that the second distributor is arranged, because the decks of a plurality of ships are divided into floors, the second distributor can distribute signals to different floors, and then the signals are subjected to power amplification through the television signal gain unit of each floor and then distributed to the televisions of corresponding users through the splitter and the set top box, so that the application scene is enlarged.
Further, a first bidirectional amplifier is arranged between the second mixer and the second distributor.
The beneficial effect of adopting the further proposal is that the coaxial cable has larger transmission loss, and the bidirectional amplifier is arranged, thus not only amplifying the uplink transmission signal but also amplifying the power of the downlink transmission signal, and improving the transmission quality.
Further, the system also comprises a second high-definition gateway, wherein the second high-definition gateway comprises a second gateway device and a third mixer, the second gateway device is respectively connected with the first distributor, the third mixer and the switch, and the output end of the third mixer is connected with the second distributor.
The beneficial effect of adopting the above further scheme is that, because the loading capacity of one first gateway device is not too large, when the code rate of the program on demand is too high, delay is possibly caused, and the second high-definition gateway is added to meet more users under the condition of obviously reducing delay, for example, if the K image quality exceeds 30 terminals, obvious delay is generated during on demand, so that two high-definition gateways are designed, 60 terminals can be provided under the condition of no obvious delay, and most of marine requirements can be met.
Further, a second bidirectional amplifier is arranged between the second high-definition gateway and the second distributor.
The beneficial effect of adopting the further proposal is that the coaxial cable has larger transmission loss, and the bidirectional amplifier is arranged, thus not only amplifying the uplink transmission signal but also amplifying the power of the downlink transmission signal, and improving the transmission quality.
Further, in the present invention,
the set top box further comprises a third high-definition gateway and a decoding main board, the third high-definition gateway is connected with the decoding main board of the set top box, the third high-definition gateway is connected with a television splitter through a user interface box, and the splitter decoding main board is connected with the television through an HDMI cable.
The beneficial effect of adopting the further scheme is that the third high-definition gateway arranged in the set-top box converts the connection signaling of the set-top box into a coaxial signal, and initiates connection service to the video-on-demand extension through the coaxial network.
Furthermore, the code modulator is also connected with a blue-ray player.
The beneficial effect of adopting the further proposal is that not only can the satellite television program be received, but also the television program issued by the blue-ray DVD can be played.
Further, the uplink request command and the video/audio signal, satellite television program are transmitted at different frequencies.
The further scheme has the beneficial effect that the uplink transmission and the downlink transmission are carried out on the same coaxial line and are set at different frequencies to prevent collision.
Furthermore, the on-demand management server is also linked with a KVM all-in-one machine.
The KVM integrated machine integrates the liquid crystal display, the keyboard, the mouse and the switcher into a whole, and can be divided into a three-in-one and a four-in-one upper rack kit, wherein the three-in-one is a control platform integrating 1 to 1 of the keyboard, the display and the mouse and connected with a host; the fourth one has integrateed the switch on trinity basis, can connect the control platform of many host computers.
Drawings
FIG. 1 is a schematic diagram of the overall system connections of an embodiment of the present invention;
fig. 2 is a schematic diagram of the connection relationship inside the set-top box according to the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
Example 1
As shown in fig. 1, a ship coaxial bidirectional video-on-demand system includes: the system comprises a video on demand extension, a television signal gain unit, a splitter and a plurality of set top boxes;
the video-on-demand extension set is connected with the television signal gain unit, the television signal gain unit is connected with the splitter, the splitter is connected with the set top boxes, and the video-on-demand extension set, the television signal gain unit, the splitter and the set top boxes are connected through coaxial cables;
the video-on-demand extension set is used for receiving video-on-demand instructions sent by the set top boxes, receiving video/audio signals and satellite television programs according to the video-on-demand instructions and sending the video/audio signals and the satellite television programs corresponding to the video-on-demand instructions to the television signal gain unit;
the television signal gain unit is used for performing power amplification on the received video/audio signals and the satellite television programs and sending the signals to the corresponding set top box in the plurality of set top boxes through the splitter;
the set-top box is used for demodulating the video/audio signals and the satellite television programs and sending the video/audio signals and the satellite television programs to the television.
The video-on-demand extension set, the television signal gain unit, the splitter and the set top boxes are all connected through coaxial cables, a video-on-demand system based on the coaxial cables is designed, the capacity is large, the bandwidth is large, when a user requests a television program, the set top box sends out request information, the video-on-demand extension set receives a request instruction and transmits a requested video/audio signal and the requested satellite television program to the television signal gain unit through the coaxial cables, and the television signal gain unit amplifies the power of the signal and then distributes the signal to the television of the user through the splitter and the set top box. The method effectively avoids the defect that the watching of the video-on-demand program is influenced by a user due to network faults, bandwidth limitation or incapability of arranging an IP network, expands the use scene of the video-on-demand system, and ensures the safety of the video-on-demand system due to the use of a single coaxial network.
The video-on-demand extension comprises a coding modulation device, a first mixer, a first distributor, an on-demand management server, a switch and a first high-definition gateway;
the switch is respectively connected with the on-demand management server, the first high-definition gateway and the coding modulation equipment;
the code modulation device, the first mixer, the first distributor and the first high-definition gateway are sequentially connected through coaxial cables, and the output end of the first high-definition gateway is connected with the television signal gain unit through the coaxial cables.
The set top box initiates a connection service to the video-on-demand extension set through a coaxial network, a first high-definition gateway in the video-on-demand extension set converts a coaxial signal into a network signal and transmits the network signal to a video-on-demand management server, on-demand software in the video-on-demand management server gives authorization to the set top box, a coding modulator receives a video/audio signal, performs coding modulation on the video/audio signal and transmits the video/audio signal to a first mixer, the first mixer receives the video/audio signal and two paths of radio frequency signals of satellite television programs, combines the two paths of radio frequency signals and transmits the combined signals to a first distributor, the first distributor outputs the received signals to the first high-definition gateway in a multi-path lossless mode, and the signals are distributed to a television.
The first high-definition gateway comprises first gateway equipment and a second mixer, the first gateway equipment is connected with the first distributor, the second mixer and the switchboard respectively, and the output end of the second mixer is connected with the television signal gain unit through a coaxial cable.
The first gateway equipment converts the network signal transmitted by the exchanger into a signal which can be transmitted on a coaxial cable, and is provided with a second mixer for mixing the video/audio signal, the two-way radio frequency signal of the satellite television program and the network signal transmitted by the exchanger.
The input end of the second distributor is connected with the second mixer, and the output end of the second distributor is connected with a plurality of television signal gain units.
The second distributor is arranged, and the decks of a plurality of ships are divided into floors, the second distributor can distribute signals to different floors, and then the signals are subjected to power amplification through the television signal gain unit of each floor and then are distributed to the televisions of corresponding users through the branching device and the set top box, so that the application scene is expanded.
And a first bidirectional amplifier is also arranged between the second mixer and the second distributor.
Because the transmission loss of the coaxial cable is large, the bidirectional amplifier is arranged, so that the uplink transmission signal and the downlink transmission signal can be amplified, and the transmission quality is improved.
The high-definition gateway system further comprises a second high-definition gateway, the second high-definition gateway comprises second gateway equipment and a third mixer, the second gateway equipment is connected with the first distributor, the third mixer and the switch respectively, and the output end of the third mixer is connected with the second distributor. .
Because the load capacity of one first gateway device is not too large, delay can be caused when the code rate of the program on demand is too high, and the second high-definition gateway is added to meet more users under the condition of obviously reducing the delay, for example, if the image quality is 4K, more than 30 terminals have obvious delay when on demand, and the delay is about 5-8 seconds, two high-definition gateways are designed, 60 terminals can be carried under the condition of no obvious delay, and most of marine requirements can be met.
And a second bidirectional amplifier is arranged between the second high-definition gateway and the second distributor.
Because the transmission loss of the coaxial cable is large, the bidirectional amplifier is arranged, so that the uplink transmission signal and the downlink transmission signal can be amplified, and the transmission quality is improved. The set top box further comprises a third high-definition gateway and a decoding main board, the third high-definition gateway is connected with the splitter through the user interface box, and the decoding main board is connected with the television through the HDMI cable.
And a third high-definition gateway is arranged in the set top box to convert the connection signaling of the set top box into a coaxial signal, and a connection service is initiated to the video-on-demand extension through a coaxial network.
The coded modulator is also connected with a blue light player.
The satellite television program can be received, and the television program issued by the blue-ray DVD can be played.
The uplink request command and the transmission of the video/audio signals and the satellite television programs are set at different frequencies. Because the uplink transmission and the downlink transmission are carried out on the same coaxial line and are arranged at different frequencies, the collision is prevented.
The on-demand management server is also linked with a KVM all-in-one machine. The KVM all-in-one machine is a KVM device integrating a liquid crystal display, a keyboard, a mouse and a switcher into a whole, and can be divided into a three-in-one and a four-in-one upper rack suite, wherein the three-in-one is a control platform integrating 1 to 1 of the keyboard, the display and the mouse and connected with a host; the fourth one has integrateed the switch on trinity basis, can connect the control platform of many host computers.
The implementation principle of the embodiment is as follows: after the equipment is started, a third high-definition gateway arranged in the set-top box converts a connection signaling of the set-top box into a coaxial signal, a connection service is initiated to the VOD extension through a coaxial network, the coaxial signal is converted into a network signal by a first high-definition gateway and a second high-definition gateway in the VOD extension and is transmitted to a VOD management server, VOD software in the VOD management server gives authorization to the set-top box, and then the set-top box logs in a VOD interface to select a corresponding video program; the video program requested by the high-definition interactive set top box is converted into a coaxial signal through a high-definition gateway in the video-on-demand distribution machine by the on-demand management server, the signal is subjected to power amplification through the television signal gain unit and then passes through the splitter and the set top box, and the set top box receiving the on-demand signal is demodulated into the on-demand television program through the internal network-coaxial module and is played by the television.
The foregoing is merely a preferred embodiment of the invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to limit the invention to other embodiments, and to various other combinations, modifications, and environments and may be modified within the scope of the inventive concept as expressed herein, by the teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A ship coaxial bidirectional video-on-demand system is characterized by comprising: the system comprises a video on demand extension, a television signal gain unit, a splitter and a plurality of set top boxes;
the video-on-demand extension set is connected with the television signal gain unit, the television signal gain unit is connected with the splitter, the splitter is connected with the set top boxes, and the video-on-demand extension set, the television signal gain unit, the splitter and the set top boxes are connected through coaxial cables;
the video-on-demand extension set is used for receiving video-on-demand instructions sent by the set top boxes, receiving video/audio signals and satellite television programs according to the video-on-demand instructions, and sending the video/audio signals and the satellite television programs corresponding to the video-on-demand instructions to the television signal gain unit;
the television signal gain unit is used for performing power amplification on the received video/audio signal and the satellite television program and sending the signals to a corresponding set top box in the plurality of set top boxes through the splitter;
the set-top box is used for demodulating the video/audio signal and the satellite television program and sending the video/audio signal and the satellite television program to the television.
2. The ship coaxial bidirectional video-on-demand system of claim 1, wherein the video-on-demand extension comprises a code modulation device, a first mixer, a first distributor, an on-demand management server, a switch, a first high-definition gateway;
the switch is respectively connected with the on-demand management server, the first high-definition gateway and the coding modulation equipment;
the code modulation device, the first mixer, the first distributor and the first high-definition gateway are sequentially connected through coaxial cables, and the output end of the first high-definition gateway is connected with the television signal gain unit through the coaxial cables.
3. The ship coaxial bidirectional video-on-demand system of claim 2, wherein the first high-definition gateway comprises a first gateway device and a second mixer, the first gateway device is connected to the first distributor, the second mixer and the switch, respectively, and an output end of the second mixer is connected to the television signal gain unit through a coaxial cable.
4. The ship coaxial bidirectional video-on-demand system of claim 3, further comprising a second distributor, an input end of the second distributor being connected to the second mixer, an output end of the second distributor being connected to the plurality of television signal gain units.
5. The ship coaxial bidirectional video-on-demand system of claim 4, wherein a first bidirectional amplifier is further disposed between the second mixer and the second distributor.
6. The ship coaxial bidirectional video-on-demand system according to any one of claims 2 to 5, further comprising a second high-definition gateway, wherein the second high-definition gateway comprises a second gateway device and a third mixer, the second gateway device is respectively connected to the first distributor, the third mixer and the switch, and an output end of the third mixer is connected to the second distributor.
7. The ship coaxial bidirectional video-on-demand system of claim 6, wherein a second bidirectional amplifier is disposed between the second high definition gateway and the second distributor.
8. The ship coaxial bidirectional video-on-demand system according to any one of claims 1 to 4, wherein the set-top box further comprises a third high-definition gateway and a decoding main board, the third high-definition gateway is connected with the decoding main board, and the third high-definition gateway is connected with the television through a user interface box.
9. The ship coaxial bidirectional video-on-demand system of any of claims 1 to 4, wherein the up-request command and the video/audio signal, satellite television program, are transmitted at different frequencies.
10. The ship coaxial bidirectional video-on-demand system according to any one of claims 1 to 4, wherein the on-demand management server is further connected with a KVM all-in-one machine.
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| CN202010272680.8A CN111447477B (en) | 2020-04-09 | 2020-04-09 | Coaxial bidirectional video-on-demand system for ships |
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| CN202010272680.8A CN111447477B (en) | 2020-04-09 | 2020-04-09 | Coaxial bidirectional video-on-demand system for ships |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112702609A (en) * | 2020-12-07 | 2021-04-23 | 桂林长海发展有限责任公司 | Ship closed circuit television video decoding method, device and storage medium |
| CN114374580A (en) * | 2021-11-17 | 2022-04-19 | 中国船舶重工集团公司第七一九研究所 | Digital audio-video system for ship |
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| CN112702609A (en) * | 2020-12-07 | 2021-04-23 | 桂林长海发展有限责任公司 | Ship closed circuit television video decoding method, device and storage medium |
| CN114374580A (en) * | 2021-11-17 | 2022-04-19 | 中国船舶重工集团公司第七一九研究所 | Digital audio-video system for ship |
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