CN108718400B - Display screen expansion structure of video conference equipment - Google Patents
Display screen expansion structure of video conference equipment Download PDFInfo
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- CN108718400B CN108718400B CN201810885383.3A CN201810885383A CN108718400B CN 108718400 B CN108718400 B CN 108718400B CN 201810885383 A CN201810885383 A CN 201810885383A CN 108718400 B CN108718400 B CN 108718400B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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Abstract
The invention provides a display screen expansion structure of video conference equipment, and belongs to the technical field of video conference equipment. The method solves the problem that the construction effect of the existing video conference equipment is not good. The display screen expansion structure of the video conference equipment comprises a host, at least one host display screen and a plurality of sub display screens, wherein the host display screen is connected with the host, the host is connected with a transmission control board for receiving uncompressed audio and video signals of the host and transmitting the uncompressed audio and video signals to the next stage, the sub display screen is connected with a serial control board for displaying the uncompressed audio and video signals of the previous stage and transmitting the uncompressed audio and video signals to the next stage, and the serial control board of one sub display screen is connected with the transmission control board in series to enable the sub display screen to obtain the uncompressed audio and video signals from the transmission control board for displaying. The invention can improve the connection convenience of multiple display screens under the condition of keeping acceptable delay rate.
Description
Technical Field
The invention belongs to the technical field of video conference equipment, and relates to a display screen expansion structure of video conference equipment.
Background
With the development of technology, video conference devices are often used in modern society to hold conferences, so that conference contents can be accurately and comprehensively transferred. The main hardware of the video conference equipment is a host, a plurality of display screens and auxiliary equipment such as a microphone, a loudspeaker box and the like, wherein the host is used for transmitting and processing data such as voice, video and the like, and the display screens are used for displaying data such as corresponding video and the like.
The video conference needs higher synchronism, that is, the content displayed by the display screen connected with the host computer needs to have synchronism with the content displayed by the display screen at the most remote position, and the problem of delay cannot be displayed is solved. The video conference equipment is shown as a multi-screen display device with the application number of CN200420121815.7 published in China patent literature, and comprises video conference equipment terminal equipment (a host machine) and a plurality of display cards supporting double screens, wherein the video conference equipment terminal equipment is connected with two or more displays, when the video conference equipment system is started by the terminal equipment, one display is automatically selected as a main display, screen coordinates of the other displays are set as slave displays, relative screen coordinates of each slave display are calculated according to relative position relation with the main display, different window interfaces of the video conference equipment are respectively corresponding to screen coordinate areas of the master display and the slave display, and different window interfaces are displayed by the master display and the slave display.
The above-mentioned patent carries out the direct connection through video conferencing equipment terminal equipment, namely host computer respectively with a plurality of displays, just the primary connection between host computer and the display, under the very big circumstances of meeting place, each display and the distance of host computer are different, but all need be connected with the host computer to how the wiring can be more troublesome, actual meeting place and walking line are too much, and construction and maintenance are very troublesome, therefore video conferencing equipment's construction effect is not good.
In order to solve the construction problem, in the prior art, a scheme of adopting wireless network connection is adopted for design, namely, a communication connection is directly established between a host and a plurality of display screens, although the problem of wiring is solved, the problem of synchronous display of the display screens cannot be met due to low wireless transmission speed, namely, the display delay is very large, the data can be compressed at a transmitting end for meeting the transmission efficiency when being transmitted, the data is decompressed at a receiving end, and when the high-definition video display is carried out, a large amount of data processing ensures that the equipment requirement is very high, and the market acceptance is not high.
Disclosure of Invention
The invention provides a display screen expanding structure of video conference equipment aiming at the problems in the prior art, and aims to solve the technical problem of how to improve the connection convenience of multiple display screens under the condition of keeping acceptable delay rate.
The invention is realized by the following technical scheme: the display screen expanding structure of the video conference equipment comprises a host, at least one host display screen and a plurality of sub display screens, wherein the host display screen is connected with the host, and is characterized in that the host is connected with a transmitting control board used for receiving uncompressed audio and video signals of the host and transmitting the uncompressed audio and video signals to the next stage, the sub display screen is connected with a serial control board used for displaying the uncompressed audio and video signals of the previous stage and transmitting the uncompressed audio and video signals to the next stage, the serial control board of one sub display screen is connected with the transmitting control board in series to enable the sub display screen to obtain uncompressed audio and video signals from the transmitting control board for displaying, and the serial control boards of all display screens are connected in series to enable the serial control board of the next sub display screen to obtain uncompressed audio and video signals from the serial control board of the adjacent previous sub display screen for displaying.
After the host computer is connected with the host computer display screen, the display of the host computer display screen can be controlled through the host computer, when the sub display screen is expanded, the audio and video information in the host computer is transmitted to the serial control board by the transmitting control board and is displayed on the sub display screen through the serial control board, the serial control board forms a serial communication circuit with input and output, and the serial communication circuit is connected in series according to the number of the sub display screens which are actually needed, so that the communication circuit formed after the sub display screens are connected is of a straight-line serial structure, the display information of the display screen is obtained from the serial communication circuit, namely, the information of video display is obtained from the last-stage serial control board instead of the host computer. Therefore, when the video conference device is expanded, a transmission line can be directly connected from a serial control panel of the last sub-display screen, and compared with the method that a host is used for being re-used to construct a preset position, the video conference device has the advantage that the display screen expansion structure can facilitate the layout and connection of the display screens. The communication circuit with the linear series structure can directly transmit uncompressed audio and video signals, and delay is avoided.
In the display screen expansion structure of the video conference device, the serial control board is provided with the receiving IC and the transmitting IC, the receiving IC and the transmitting IC are connected with the HDI bus capable of carrying out bidirectional communication, the receiving IC is connected with the receiving end RJ45 interface based on the HDbaseT protocol, the transmitting IC is connected with the transmitting end RJ45 interface based on the HDbaseT protocol, the receiving IC is internally integrated with the receiving end link processor capable of connecting the receiving end RJ45 interface with the HDI bus for carrying out high-speed bidirectional communication, and the transmitting IC is internally integrated with the transmitting end link processor connected with the transmitting end RJ45 interface and the HDI bus for carrying out high-speed bidirectional communication.
IC, integrated circuit, is an acronym for integrated circuit. HDbaseT is an existing audio and video transmission standard. The receiving IC and the transmitting IC can be selected from VS2000 series chips produced by Valens company, a link processor and a CPU for controlling the link processor to be connected are integrated in the chips, a block serial control board is manufactured by using the chips, and a serial communication circuit for realizing high-speed transmission is realized. The communication channel formed by the serial connection can rapidly transmit uncompressed audio and video signals, and after the serial control board of the next stage is linked to the serial control board of the previous stage through more than five kinds of networks, the transmission speed can be kept high. Besides the VS2000 series chip produced by Valens corporation, other IC's are applicable as long as the link processor is integrated with the interface capable of fast connecting the HDI bus and RJ 45.
In the display screen expansion structure of the video conference device, the receiving IC is internally provided with the HDMI output interface connected with the receiving end link processor and the receiving end CPU for controlling the receiving end link processor, and the receiving end RJ45 interface can convey uncompressed audio and video information to the HDMI output interface through the receiving end link processor under the control of the receiving end CPU so as to enable the corresponding sub display screen to display. Through HDMI output interface and link treater, can be with the audio and video signal that receiving terminal RJ45 interface received can high-speed get to carry sub-display screen and show, the establishment of this passageway makes to show and transmit audio and video signal to the next level not have too big delay.
In the display screen expansion structure of the video conference device, a transmitting IC is arranged on the transmitting control board, a transmitting end link processor and a transmitting end CPU for controlling the transmitting end link processor are arranged in the transmitting IC, the transmitting IC is connected with a transmitting end RJ45 interface based on an HDbaseT protocol, and an HDMI input interface connected with the transmitting end link processor is arranged in the transmitting IC to enable the HDMI input interface to be in bidirectional communication connection with the transmitting end RJ45 interface. Under the control of a transmitting end CPU, uncompressed audio and video information input by an HDMI input interface can be transmitted to a transmitting end RJ45 interface at high speed through a transmitting end link processor, and the transmitting end RJ45 interface is transmitted to the next stage at high speed through an HDbaseT protocol.
In the display screen expansion structure of the video conference device, an HDMI input interface connected with a transmitting end link processor and a transmitting end CPU used for controlling the transmitting end link processor are arranged in the transmitting IC, uncompressed audio and video information input by the HDMI input interface can be transmitted to a receiving end link processor through the transmitting end link processor and an HDI bus under the control of the transmitting end CPU, uncompressed audio and video information is transmitted to a transmitting end RJ45 interface of an upper stage through the receiving end link processor and the receiving end RJ45 interface under the control of the transmitting end CPU of the stage, uncompressed audio and video information is transmitted to a receiving end link processor of the stage through the transmitting end RJ45 interface of the stage, the transmitting end link processor and the HDI bus of the stage under the control of the transmitting end CPU, and therefore uncompressed audio and video signals are reversely transmitted to a host computer by the stage.
A bidirectional communication channel is established in the serial communication circuit structure, so that the audio and video signals of any stage can be reversely transmitted to the upper stage and stored in the host. In order to avoid the delay and improve the efficiency, the host can be divided into a first host and a second host, and the data reversely transmitted is stored into the second host, so that the influence on the transmission of the audio and video signals in the first host from top to bottom is avoided.
As a second scheme of transmitting audio and video signals of a sub-display screen camera in a serial structure, in the display screen expanding structure of the video conference device, a host comprises a first sub-host and a second sub-host, the first sub-host is connected with a host display screen, the second sub-host is connected with a camera display screen, a receiving control board is connected in series on a last serial control board, the receiving control board comprises a receiving IC and a receiving end RJ45 interface connected with the receiving IC based on an HDbaseT protocol, an HDMI output interface connected with a receiving end link processor and a receiving end CPU used for controlling the receiving end link processor are arranged in the receiving IC, and the HDMI output interface is connected with the second sub-host. The RJ45 interface is connected between the receiving control board and the last serial control board through a network cable, so that the receiving control board is connected with the serial control board in series, the generated video or audio information of any stage is transmitted from the last stage to the next stage, the receiving control board transmits the audio and video information to the sub-host computer II under the control of the CPU of the receiving end, the sub-host computer II performs data storage processing, and when the audio and video information is required to be displayed at any stage, the sub-host computer II starts to transmit the audio and video information from the last stage to the next stage to the serial control board of the call from the last stage to the next stage, and then output and display are performed.
In the display screen expansion structure of the video conference device, the receiving end RJ45 interface and the transmitting end RJ45 interface are connected by five types of network cables or more than five types of network cables, wherein two twisted pair lines are used for transmitting audio and video information transmitted by the sub-host, and the other two twisted pair lines are used for transmitting video information of the camera to the sub-host. In this way, the transmission efficiency of the ring-shaped series connection can be improved. For practical applications, four twisted pairs may be reassigned into four-way transmission.
In the display screen expansion structure of the video conference device, the serial control panel is also provided with an MCU, and the MCU is connected with the receiving IC by I 2 C bus and/or UART bus, the MCU is connected with the transmitting IC and I 2 And the MCU is also connected with a key interface through an I/O interface.
MCU is Micro Controller Unit English letterThe writing is a micro control unit used for controlling, for example, display screen overturning, camera rotation, loudspeaker output volume and the like. These bus connections allow the MCU to establish control and data communications with the receiving IC and the transmitting IC. The simple replacement MCU as the scheme can pass through only one I 2 The C-bus and/or UART-bus are connected to the receiving IC and the transmitting IC, respectively, and then communicate and control in an addressed manner. And the connection keys on the MCU can be set according to actual needs, such as keys for controlling a camera, controlling the speaking sequence of a microphone and the like. In order to better expand functions later, interfaces such as UART can be reserved on the MCU for subsequent expansion.
In the display screen expansion structure of the video conference device, the receiving IC is further provided with an auxiliary output interface comprising I 2 C interface, MISO interface, ethernet interface, I 2 S interface, CIR interface, UART interface and/or SPDIF interface, through I 2 And the interface C is connected with a sound box or an earphone connector. Through each auxiliary interface, corresponding data can be output, e.g. through I 2 And the C interface is connected with a sound box or an earphone, so that the audio can be output. For example, an infrared I/O interface can be arranged on the circuit through a CIR interface to carry out infrared data transmission.
In the display screen expansion structure of the video conference device, the transmitting IC is further provided with an auxiliary input interface, including I 2 C interface, MISO interface, ethernet interface, I 2 S interface, CIR interface, UART interface and/or SPDIF interface, I 2 And the C interface is connected with the microphone connector. Through each auxiliary interface, corresponding data can be input, e.g. through I 2 The C interface is connected with the microphone and can input audio. For example, an infrared I/O interface can be arranged on the circuit through a CIR interface to carry out infrared data transmission.
Compared with the prior art, the display screen expansion structure of the video conference equipment has the following advantages:
1. the main machine and the sub display screen form multistage connection from the main machine, so that only the front sub display screen is connected with the main machine, and the rear sub display screen is connected with the front display screen, thereby greatly reducing the connection difficulty, improving the connection convenience and avoiding the problem that the wiring is too long to finish when the display screens are laid out.
2. The invention can enable the serial control boards of each stage to reversely convey or form annular transmission in the serial structure circuit, and enable the audio/video signals sent by the serial control boards to be obtained by other serial control boards, thereby improving the practicability and convenience of information interaction, and the host can independently carry out the conveying from top to bottom and from bottom to top simultaneously, thereby improving the conveying efficiency and not generating a delay effect.
3. According to the invention, a high-frequency and high-speed hardware circuit is built in the serial control panel, so that the delay rate of audio and video signal transmission of each stage is smaller than 25 mu s, thereby greatly reducing the delay rate and improving the use experience of video conference equipment.
4. The distance of single-stage connection can reach 100 meters, and the requirements of various meeting scenes can be met.
Drawings
Fig. 1 is a schematic diagram of an expansion structure of a video conference apparatus according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of an expansion structure of a video conference device in a second embodiment of the present invention.
Fig. 3 is a schematic diagram of an expansion structure of a video conference apparatus in the third embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a serial control board in the first embodiment.
Fig. 5 is a schematic diagram of the interface of the serial control board in the first embodiment.
Fig. 6 is a schematic diagram of the structure of the transmission control board in the first embodiment.
Fig. 7 is a schematic diagram of the structure principle of the receiving control board in the third embodiment.
In the figure, 1, a host; 2. a host display screen; 3. a sub display screen; 4. a serial control board; 5. a control panel is sent; 6. receiving a control panel; 7. and a camera display screen.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Embodiment one:
as shown in fig. 1, when a video conference site is arranged, a host display screen 2 is placed in front of the video conference site, and the host display screen 2 is connected with a host 1. The number of the sub-display screens 3 on the seat is generally more than 3 according to actual requirements, and particularly for large conferences, the number of the sub-display screens 3 which can be connected is up to 100. With the arrangement of fig. 1, the construction will be greatly simplified, in particular:
the transmitting control board 5 is connected to the host 1 through an HDMI connecting wire, the transmitting control board 5 is a PCB board used for receiving uncompressed audio and video signals of the host 1 and transmitting to the next stage, the transmitting control board 5 is connected with the serial control board 4 through five types of network cables, the serial control board 4 is a PCB board used for displaying the uncompressed audio and video signals of the previous stage and transmitting the uncompressed audio and video signals to the next stage, the serial control board 4 of the next stage is connected with the serial control board 4 of the previous stage through the network cables, and the serial control boards 4 of each display screen are sequentially connected in series according to the actual number of the sub display screens 3, so that the serial control board 4 of the next sub display screen 3 acquires the uncompressed audio and video signals from the serial control board 4 of the adjacent previous sub display screen 3 for displaying, various control keys, cameras, sound boxes or earphone and other auxiliary devices can be added on the serial control board 4 after the serial main engineering is finished, and thus the whole video conference can be arranged on site, and construction becomes very simple and convenient.
As shown in fig. 4, the serial control board 4 is provided with a receiving IC and a transmitting IC, and in this example, the receiving IC and the transmitting IC are respectively selected from a VS2000 series R chip and a T chip manufactured by Valens company. The receiving IC is provided with a bottom physical layer (PHY) for an external signal interface, the bottom physical layer is connected with a receiving end RJ45 interface after being connected with a transformer, a connecting layer is arranged in the receiving IC and comprises a main receiving end link processor and an auxiliary receiving end link processor which are used for connecting two paths of communication channels to enable data to be transmitted, the main receiving end link processor is connected with the bottom physical layer through a main input channel, and the connecting structure of the connecting layer adopts an HDbaseT protocol for bidirectional communication. The main receiving end link processor is connected with an HDMI output interface for outputting audio and video signals, the signal transmission channel can reach 8Gbit/s, the auxiliary receiving end link processor is connected with other output ports through an auxiliary input channel, and the signal transmission channel can reach 300Mbit/s. The receiving IC is internally provided with a receiving end CPU for controlling the receiving end link processor, so that under the control of the receiving end CPU, the receiving end RJ45 interface can convey uncompressed audio and video information to the HDMI output interface through the receiving end link processor to enable the corresponding sub display screen 3 to display, and the sub display screen 3 can obtain audio and video signals to display audio and video as long as being connected to the HDMI output interface.
The transmitting IC is similar to the receiving IC, a bottom physical layer (PHY) for an external signal interface is arranged, the bottom physical layer is connected with a transmitting end RJ45 interface after being connected with a transformer, a connecting layer is arranged in the transmitting IC, the connecting layer comprises a main transmitting end link processor and an auxiliary transmitting end link processor which are used for connecting two paths of communication channels to enable data to be transmitted, the main transmitting end link processor is connected with the bottom physical layer through a main output channel, and the connecting structure of the connecting layer adopts an HDbaseT protocol for bidirectional communication. The main transmitting end link processor is connected with an HDMI input interface for inputting audio and video signals, the signal transmission channel can reach 8Gbit/s, the auxiliary transmitting end link processor is connected with other input ports through the auxiliary input channel, and the signal transmission channel can reach 300Mbit/s. The transmitting IC is internally provided with a transmitting end CPU for controlling the transmitting end link processor, so that uncompressed audio and video information input by the HDMI input interface can be transmitted to the transmitting end RJ45 interface at a high speed through the transmitting end link processor under the control of the transmitting end CPU, and the transmitting end RJ45 interface is transmitted to the next stage at a high speed through an HDbaseT protocol. After the cameras are connected through HDMI connecting wires, video information can be transmitted out through the main transmitting end link processor, the main output channel, the bottom physical layer and the transmitting end RJ45 interface.
The receiving IC and the transmitting IC are arranged on a PCB board and are both provided with an HDI interface, and the receiving IC and the transmitting IC are connected with an HDI bus capable of carrying out two-way communication through the HDI interface, so that the transmitting efficiency is improved, and the receiving IC and the transmitting IC are mutually close. The CPU for controlling the main link processor and the auxiliary link processor is integrated in the chip, specifically, a receiving end RJ45 interface is used as an input port, a transmitting end RJ45 interface is used as an output port, a communication circuit for linear transmission is established between the receiving end RJ45 interface and the transmitting end RJ45 interface, compression processing of audio and video information is not performed, namely, the receiving IC is connected with the receiving end RJ45 interface based on an HDbaseT protocol, an HDI bus capable of performing bidirectional communication is connected between the receiving IC and the transmitting IC, the transmitting IC is connected with the transmitting end RJ45 interface based on the HDbaseT protocol, and thus, a serial high-speed communication channel is formed between the input port and the output port. The communication channel formed by the series connection can rapidly transmit uncompressed audio and video signals, the linear communication channel with the structure greatly reduces the delay rate, and the delay of pictures can not be generated after the multi-layer cascade connection.
As shown in fig. 5, the serial control board 4 is also provided with an MCU, and I is connected between the MCU and the receiving IC 2 C bus and UART bus, I is connected between MCU and transmitting IC 2 The MCU is also connected with a key interface through an I/O interface. The display screen can also be made into a touch display screen, and the control circuit is connected to the MCU for control. The host display screen 2, the camera display screen 7 and/or the sub display screen 3 adopt touch display screens, the touch control interfaces of the host display screen 2, the camera display screen 7 and/or the sub display screen 3 are connected with one of the MCU, the receiving IC or the transmitting IC, and the MCU is connected with keys for controlling the touch permission of the display screen. It is also possible that the control line of the touch display screen is connected to the MCU, so that the touch display screen can control various auxiliary devices such as volume, camera, etc., or that the control line of the touch display screen is connected to the receiving IC or the transmitting IC and fed to the MCU for control, and the selection key is connected to the key interface for performing selection control on the touch authority of the touch display screen.
The receiving IC is provided with an auxiliary output interface comprising I 2 C interface, MISO interface, ethernet interface, I 2 S interface, CIR interface, UART interface and/or SPDIF interface, through I 2 C interface connection sound box or earphone is evenThe CIR interface can be provided with an infrared I/O interface on a circuit for infrared data transmission. Corresponding data can be output through the respective auxiliary interfaces. These interfaces may be added, subtracted or reserved depending on the actual situation. The auxiliary interface can also comprise a USB interface arranged in a master-slave mode, and the USB interface can be connected with a mouse and a keyboard and the like to perform signal input operation.
The transmission IC is provided with an auxiliary input interface comprising I 2 C interface, MISO interface, ethernet interface, I 2 S interface, CIR interface, UART interface and SPDIF interface, I 2 C interface is connected with the microphone connector through I 2 The C interface is connected with the microphone, can input audio, and the CIR interface can be provided with an infrared I/O interface on a circuit for infrared data transmission. Corresponding data can be input via the respective auxiliary interfaces. These interfaces may be added, subtracted or reserved depending on the actual situation. The auxiliary interface can also comprise a USB interface arranged in a master-slave mode, and the USB interface can be connected with a mouse and a keyboard and the like to perform signal input operation.
Through the design of the structure, the serial control board 4 ensures that after the receiving end RJ45 interface on the serial control board 4 of the next stage is connected with the transmitting end RJ45 interface of the serial control board 4 of the previous stage through five types of networks, the transmission efficiency can be kept very good under the connection of a 100-meter long network cable, the transmission of one-stage audio/video signals between two adjacent serial control boards 4 is in the mu s stage, and the delay rate can be less than 25 mu s.
As shown in fig. 6, the transmission control board 5 is only provided with a transmission IC, the transmission IC is provided with a bottom physical layer (PHY) for an external signal interface, the bottom physical layer is connected with a transmission end RJ45 interface after being connected with a transformer, a connection layer is arranged in the transmission IC, the connection layer comprises a main transmission end link processor and an auxiliary transmission end link processor for connecting two paths of communication channels to enable data transmission, the main transmission end link processor is connected with the bottom physical layer through a main output channel, the main transmission end link processor is connected with an HDMI input interface for inputting audio and video signals, and the HDMI input interface is connected with the host 1 through an HDMI connection line. When the host computer 1 is connected, the serial control board 4 may be used as the transmission control board 5, and the serial control board 4 has all the functions of the transmission control board 5.
The host 1 is connected by the transmission control board 5, and the plurality of sub-display screens 3 are connected by the serial control board 4, so that the communication circuit formed after the plurality of sub-display screens 3 are connected is of a straight-line serial structure, and display information of the display screens is obtained from the serial communication circuit, that is, information of video display is obtained from the upper-stage serial control board 4 instead of the host 1. Therefore, when expanding, a transmission line can be directly connected from the serial control panel 4 of the last sub-display screen 3, and compared with the method that construction from the host 1 to a preset position is simpler and more convenient, the display screen expanding structure of the video conference equipment can facilitate the layout and connection of the display screens.
Example two
The second embodiment is basically the same as the first embodiment, except that as shown in fig. 2, the host 1 is divided into a first sub-host and a second sub-host, and the first sub-host and the second sub-host may be integrated or made independent, the first sub-host is connected with the host display 2, the second sub-host is connected with the camera display 7, the first sub-host is connected with the serial control board 4 through the transmission control board 5, and the second sub-host is connected with the serial control board 4 through the HDMI output interface. The secondary host is mainly used for receiving and storing and processing audio and video information of cameras and the like, namely, after the cameras at any stage of display screen of the serial structure obtain permission, the cameras are transmitted to the secondary host from bottom to top in the serial channel, the secondary host displays camera signals on the camera display screen 7, and can also send the audio and video signals of the cameras in the secondary host to the requested display screen for display through the serial channel according to the request of the display screen of any stage.
The specific reverse transport is as follows: the HDMI input interface is connected with equipment such as a camera, inputs uncompressed audio and video signals to a main transmitting end link processor in a transmitting IC, can convey uncompressed audio and video information input by the HDMI input interface to a receiving end link processor through the transmitting end link processor and an HDI bus under the control of a transmitting end CPU, conveys uncompressed audio and video information to a transmitting end RJ45 interface of a previous stage through the receiving end link processor and the receiving end RJ45 interface under the control of the transmitting end CPU of the stage, and conveys uncompressed audio and video information to the receiving end link processor of the stage through the transmitting end RJ45 interface of the stage, the transmitting end link processor and the HDI bus of the stage under the control of the transmitting end CPU, so that one-stage reverse conveying conveys uncompressed audio and video signals to a sub-host II.
Therefore, a plurality of keys are additionally arranged on the MCU to control the request and response of the whole serial structure and the single-stage opening and closing control. Thus, the display screen with the whole serial structure can have stronger functions.
Example III
The third embodiment is basically the same as the first embodiment, except that, as shown in fig. 3, the host 1 is divided into a first sub-host and a second sub-host, which may be integrated or independent, where the first sub-host is connected to the host display 2, the second sub-host is connected to the camera display 7, and the last serial control board 4 is connected to the receiving control board 6 in series, where the receiving control board 6 is connected to the second sub-host, and the first sub-host and the second sub-host may establish a bidirectional communication connection, so as to form an annular communication mode. The audio and video signals are transmitted from the first sub-host to the first sub-host, the camera at the display screen of any one stage can downwards transmit the audio and video signals of the camera to the second sub-host, the second sub-host stores the audio and video signals, and according to the request of any stage (except the current stage of transmitting the audio and video signals of the camera), the camera signals in the second sub-host can be downwards transmitted to the display screen sending the request for display from top to bottom. Of course, as optimization, the lower display screen of the current stage of transmitting the camera audio/video signals can also directly display according to the camera audio/video signals of the previous stage, and can be optimized and selected according to the needs.
The specific structure of the receiving control board 6 is shown in fig. 7, a receiving IC is arranged on the receiving control board 6, the receiving IC is provided with a bottom physical layer (PHY) for an external signal interface, the bottom physical layer is connected with a receiving end RJ45 interface after being connected with a transformer, a connecting layer is arranged in the receiving IC, the connecting layer comprises a main receiving end link processor and an auxiliary receiving end link processor which are used for connecting two paths of communication channels to enable data transmission, the main receiving end link processor is connected with the bottom physical layer through a main input channel, and the main receiving end link processor is connected with an HDMI output interface for outputting audio and video signals. The serial control board 4 may be used as the receiving control board 6, and the serial control board 4 has all the functions of the receiving control board 6. The HDMI output interface is connected with the secondary host.
For convenience of connection, the receiving control board 6 and the transmitting control board 5 may be made together or separated, and because of the ring structure, the receiving control board 6 is replaced by the serial control board 4 and connected to any one node. In order to improve transmission efficiency, the receiving end RJ45 interface and the transmitting end RJ45 interface are connected by five types of network cables or more than five types of network cables, wherein two twisted pairs are used for transmitting audio and video information transmitted by the sub-host, and the other two twisted pairs are used for transmitting video information of the camera to the sub-host. In this way, the transmission efficiency of the ring-shaped series connection can be improved. For practical applications, four twisted pairs may be reassigned into four-way transmission.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the terms of the host 1, the host display 2, the sub display 3, the serial control board 4, the transmission control board 5, the reception control board 6, the camera display 7, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (6)
1. The display screen expansion structure of the video conference equipment comprises a host (1), at least one host display screen (2) and a plurality of sub display screens (3), wherein the host display screen (2) is connected with the host (1), and is characterized in that the host (1) is connected with a transmitting control board (5) for receiving uncompressed audio and video signals of the host (1) and transmitting the uncompressed audio and video signals to the next stage, the sub display screens (3) are connected with a serial control board (4) for displaying the uncompressed audio and video signals of the last stage and transmitting the uncompressed audio and video signals to the next stage, and the serial control board (4) of one sub display screen (3) is connected with the transmitting control board (5) in series to enable the sub display screen (3) to obtain the uncompressed audio and video signals from the transmitting control board (5) for displaying;
the device is characterized in that a transmitting IC (integrated circuit) is arranged on the transmitting control board (5), a transmitting end link processor and a transmitting end CPU (Central processing Unit) for controlling the transmitting end link processor are arranged in the transmitting IC, the transmitting IC is connected with a transmitting end RJ45 interface based on an HDbaseT protocol, an HDMI input interface connected with the transmitting end link processor is arranged in the transmitting IC, a bidirectional communication connection is established between the HDMI input interface and the transmitting end RJ45 interface, and under the control of the transmitting end CPU, uncompressed audio and video signals input by the HDMI input interface can be transmitted to the transmitting end RJ45 interface through the transmitting end link processor and are externally transmitted to the next stage through the HDbaseT protocol by the transmitting end RJ45 interface;
the serial control boards (4) of the sub display screens (3) are connected in series to enable the serial control board (4) of the next sub display screen (3) to acquire uncompressed audio and video signals from the serial control board (4) of the adjacent previous sub display screen (3) for display, the serial control board (4) is provided with a receiving IC and a transmitting IC, an HDI bus capable of carrying out bidirectional communication is connected between the receiving IC and the transmitting IC, the receiving IC is connected with a receiving end RJ45 interface based on an HDbase T protocol, the transmitting IC is connected with a transmitting end RJ45 interface based on the HDbase T protocol, a receiving end link processor capable of connecting the receiving end RJ45 interface with the HDI bus for carrying out high-speed bidirectional communication is integrated in the receiving IC, a transmitting end link processor connected with the transmitting end RJ45 interface and the HDI bus for carrying out high-speed bidirectional communication is integrated in the transmitting IC, the receiving IC is internally provided with an HDMI output interface connected with the receiving end link processor and a receiving end CPU used for controlling the receiving end link processor, the receiving end IC is internally provided with the HDMI output interface connected with the receiving end link processor and the receiving end CPU used for controlling the receiving end link processor, under the control of the receiving end CPU, the receiving end RJ45 interface can convey uncompressed audio and video signals to the HDMI output interface through the receiving end link processor to enable the corresponding level sub-display screen (3) to be displayed, meanwhile, the receiving end RJ45 interface and the transmitting end RJ45 interface establish a communication channel for linear transmission, the uncompressed audio and video signals can be transmitted to a next-stage serial control board (4), under the control of the transmitting end CPU, the uncompressed audio and video signals input by the HDMI input interface can be conveyed to the receiving end link processor through the transmitting end link processor and an HDMI bus, under the control of a receiving end CPU, the uncompressed audio and video signal is transmitted to a transmitting end RJ45 interface of a previous stage through a receiving end link processor and a receiving end RJ45 interface, and is transmitted to the receiving end link processor of the previous stage through the transmitting end RJ45 interface of the previous stage, the transmitting end link processor and the HDI bus of the previous stage under the control of the transmitting end CPU of the previous stage, so that the uncompressed audio and video signal is transmitted to a host (1) through the reverse transmission of the previous stage.
2. The display screen expansion structure of video conference equipment according to claim 1, wherein the host (1) comprises a first sub-host and a second sub-host, the first sub-host is connected with the host display screen (2), the second sub-host is connected with the camera display screen (7), the last serial control board (4) is connected with the receiving control board (6) in series, the receiving control board (6) comprises a receiving IC and a receiving end RJ45 interface connected with the receiving IC based on an HDbaseT protocol, the receiving IC is internally provided with an HDMI output interface connected with a receiving end link processor and a receiving end CPU for controlling the receiving end link processor, and the HDMI output interface is connected with the second sub-host.
3. The expansion structure of the display screen of the video conference device according to claim 2, wherein the receiving end RJ45 interface and the transmitting end RJ45 interface are connected by five or more than five types of network cables, two twisted pair wires are used for transmitting the audio and video information transmitted by the sub-host, and the other two twisted pair wires are used for transmitting the video information of the camera to the sub-host.
4. The display screen expanding structure of the video conference equipment according to claim 1, wherein the serial control board (4) is further provided with an MCU, and the MCU is connected with the receiving IC by I 2 C bus and/or UART bus, the MCU is connected with the transmitting IC and I 2 And the MCU is also connected with a key interface through an I/O interface.
5. The display screen expansion structure of the video conference equipment according to claim 4, wherein the host display screen (2), the camera display screen (7) and/or the sub-display screen (3) are touch display screens, and touch control interfaces of the host display screen (2), the camera display screen (7) and/or the sub-display screen (3) are connected with the MCU, the receiving IC or the transmitting IC, and keys for controlling touch permission of the display screen are connected on the MCU.
6. The video conference device display screen expansion structure according to claim 5, wherein the receiving IC is further provided with a USB interface and an auxiliary output interface, the auxiliary output interface including I 2 C interface, MISO interface, ethernet interface, I 2 S interface, CIR interface, UART interface and/or SPDIF interface, through I 2 The interface C is connected with a sound box or an earphone connector; the transmitting IC is also provided with a USB interface and an auxiliary input interface, and the auxiliary input interface comprises I 2 C interface, MISO interface, ethernet interface, I 2 S interface, CIR interface, UART interface and/or SPDIF interface, I 2 And the C interface is connected with the microphone connector.
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| CN111526399A (en) * | 2020-04-29 | 2020-08-11 | 北京汽车股份有限公司 | Vehicle-mounted infotainment system, vehicle and communication method of vehicle-mounted infotainment system |
| CN112084129A (en) * | 2020-09-11 | 2020-12-15 | 广州彩熠灯光股份有限公司 | Data transmission system and method |
| CN112069097A (en) * | 2020-09-22 | 2020-12-11 | 禹创半导体(深圳)有限公司 | Protection method for MIPI multipoint or point-to-point transmission |
| CN113590524A (en) * | 2021-08-03 | 2021-11-02 | 上海联影医疗科技股份有限公司 | Cross-veneer daisy chain transmission structure, master veneer, slave veneer and system |
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