CN112291488A

CN112291488A - Conference system for guaranteeing information security of intranet

Info

Publication number: CN112291488A
Application number: CN202011209467.9A
Authority: CN
Inventors: 董庆军
Original assignee: Confidential Transportation Bureau Of General Office Of Cpc Central Committee
Current assignee: Confidential Transportation Bureau Of General Office Of Cpc Central Committee
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-01-29

Abstract

The invention relates to a conference system for guaranteeing the safety of intranet information, which comprises an audio and video signal isolation device, a display screen, intranet conference equipment and extranet conference equipment, wherein the display screen is connected with the intranet conference equipment; the audio/video signal isolation device provides one or more groups of switchable multimedia channels and audio channels which are respectively used for transmitting multimedia signals and audio signals from an internal network and/or an external network; the display screen is connected with the multimedia channel of the audio and video signal isolation device; the intranet conference equipment is at least connected with an intranet input end of a multimedia channel of the audio and video signal isolation device; the external network conference equipment is at least connected with the multimedia channel external network input end of the audio and video signal isolation device and sends external network multimedia information to a display screen through the audio and video signal isolation device. The invention completely and physically isolates the internal network and the external network used in the conference system, thereby ensuring the information safety of the internal network when the conference is carried out.

Description

Conference system for guaranteeing information security of intranet

Technical Field

The invention relates to the technical field of network information security, in particular to a conference system for guaranteeing the information security of an intranet.

Background

With the rapid development of social economy, the internet computer information technology rises and permeates the aspects of society. The internet brings various conveniences to people and also provides challenges for the safe use of information.

In most of the industries in the society, such as finance, transportation, energy, government agencies and the like, the networks of enterprises or institutions are divided into an internal network and an external network by installing equipment such as an isolation card, the internal network is used for internal office automation, and the external network is used for external information distribution, information acquisition on the internet, information communication in the form of e-mail and the like. For the safety of data, the internal network and the external network realize the physical isolation of the internal network and the external network through isolation cards, network gates and other modes. In addition, in order to ensure the security of the internal information, people also set various security measures, such as using a firewall, an IPS, and an anti-virus product to perform security protection on the network edge to defend external threats, and encrypting data transmitted in the network.

However, the above security measures are not suitable for all application scenarios. For example, in some large integrated conference systems, an external network needs to be accessed to obtain information of the external network during a conference using an internal network. For example, conference systems in fire command centers, traffic command centers, and emergency command centers usually include devices such as a large display screen, a microphone, and a sound box. When a conference is in progress, an external network is usually required to be accessed, audio and video information of the external network is displayed, and switching between the external network and an internal network is carried out at any time according to requirements. When the intranet is accessed to the external network and switched with the external network, the confidentiality of the intranet information needs to be ensured. However, the aforementioned physical isolation devices, such as the isolation card and the gatekeeper, cannot switch the audio/video signals of the internal and external networks.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a conference system for guaranteeing the safety of intranet information, which is used for guaranteeing the safety of the intranet information when audio and video information is switched with an external network during a conference.

In order to solve the technical problem, the invention provides a conference system for guaranteeing the safety of intranet information, which comprises an audio and video signal isolation device, a display screen, intranet conference equipment and extranet conference equipment, wherein the audio and video signal isolation device is used for isolating the intranet information from the extranet conference equipment; the audio/video signal isolation device provides one or more groups of switchable multimedia channels and audio channels which are respectively used for transmitting multimedia signals and audio signals from an internal network and/or an external network; the display screen is connected with the multimedia channel of the audio and video signal isolation device and plays the intranet and/or extranet multimedia information transmitted by the audio and video signal isolation device; the intranet conference equipment is at least connected with an intranet input end of a multimedia channel of the audio and video signal isolation device and sends intranet multimedia information to a display screen through the audio and video signal isolation device; the external network conference equipment is at least connected with the multimedia channel external network input end of the audio and video signal isolation device, and sends external network multimedia information to a display screen through the audio and video signal isolation device.

The conference system provided by the invention can completely physically isolate the internal network from the external network in the process of conference, thereby ensuring the information safety of the internal network in the process of audio and video playing.

Drawings

Preferred embodiments of the present invention will now be described in further detail with reference to the accompanying drawings, in which:

FIG. 1 is a functional block diagram of a conferencing system according to one embodiment of the present invention;

fig. 2 is an external view schematic diagram of an audio-video signal isolation device according to an embodiment of the invention;

fig. 3 is a schematic diagram of a front panel of an audio-video signal isolation device according to an embodiment of the invention;

fig. 4 is a schematic diagram of a rear panel of an audio-video signal isolation device according to an embodiment of the invention;

fig. 5 is a schematic circuit diagram of an audio-video signal isolation device according to an embodiment of the present invention;

FIG. 6 is a circuit schematic of a relay control simultaneously controlling multiple sets of contacts according to one embodiment of the present invention;

FIG. 7 is a schematic diagram of a circuit for controlling multiple sets of contacts when two relays are connected in parallel according to one embodiment of the present invention;

FIG. 8 is a circuit schematic of two control interfaces respectively controlling relay contacts according to one embodiment of the present invention;

FIG. 9 is a schematic diagram of the interfacing of two signal transmission channels according to one embodiment of the present invention;

FIG. 10 is a schematic circuit diagram of a housing protector according to one embodiment of the present invention;

FIG. 11 is a schematic diagram of a power filter circuit according to an embodiment of the invention;

FIG. 12 is a schematic diagram of a device connection according to a first embodiment of the conferencing system in accordance with the invention;

FIG. 13 is a schematic diagram of the connection of devices according to a second embodiment of the conferencing system in accordance with the invention;

FIG. 14 is a schematic diagram of device connections of a third embodiment of a conferencing system in accordance with the invention;

FIG. 15 is a schematic diagram of a portion of the equipment connections of a fourth embodiment of a conferencing system in accordance with the invention;

FIG. 16 is one of the schematic diagrams of a split display showing a large screen according to one embodiment of the present invention;

FIG. 17 is a second schematic view of a split display showing a large screen according to one embodiment of the present invention; and

fig. 18 is a third schematic diagram of a split display for displaying a large screen according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.

The invention provides a conference system for guaranteeing information security of an intranet, and as shown in fig. 1, the conference system is a schematic block diagram of the conference system according to an embodiment of the invention. The conference system at least comprises an audio and video signal isolation device 1a, an intranet conference device 2a, an extranet conference device 3a and a display screen 4 a. Wherein the audio/video signal isolation device 1a is configured to provide switchable in/out network multimedia channels and in/out network audio channels. In the figure, the thick solid line transmits multimedia signals, and the thin solid line transmits audio signals. The intranet conference equipment 2a is configured to be connected with an intranet input end of a multimedia channel of the audio and video signal isolation device and an intranet input end of an audio channel; the external network conference equipment 3a is configured to be connected with the multimedia channel external network input end and the audio channel external network input end of the audio and video signal isolation device 1 a; the display screen 4a is configured to be connected with the multimedia channel output end of the audio/video signal isolation device 1 a. The intranet conference equipment 2a sends intranet multimedia information to a display screen 4a through the audio and video signal isolation device, and receives intranet audio information sent out through the audio and video signal isolation device 1a according to needs; the external network conference equipment 3a sends external network multimedia information to the display screen 4a through the audio and video signal isolation device, and receives external network audio information transmitted from the audio and video signal isolation device 1a according to needs. The invention physically isolates the audio and video signals of different networks through the audio and video signal isolation device 1a, thereby ensuring that the respective network information is not leaked.

Fig. 2 is a schematic external view of an audio-video signal isolation apparatus according to an embodiment of the present invention. In the present embodiment, the device includes a housing 1, and the housing 1 includes a front panel and a rear panel, as shown in fig. 3 and 4, various interfaces are provided on the panels for accessing audio and video signals. The inside of the shell 1 is a circuit of the device, various electrical components are installed on an electrical board, and the electrical board is fixed with a bottom plate of the shell. According to the installation and use places, the shell also comprises corresponding structures, for example, heat dissipation holes are arranged on a bottom plate, a top plate or side plates; when the bottom plate is used as a mounting surface, mounting structures are arranged on the bottom plate, such as mounting holes arranged on the protruding edge 11, and the bottom plate is mounted with other equipment through a connecting piece.

Fig. 5 is a circuit schematic diagram of an audio-video signal isolation device according to an embodiment of the invention. The audio/video signal isolation device at least comprises a control interface 12 and a multimedia signal transmission circuit 13, and in this embodiment, according to needs, the device further comprises two groups of

audio transmission circuits

14 and 15 and an indicator lamp control circuit 16. The multimedia signal transmission circuit 13 and the

audio transmission circuits

14, 15 constitute a multimedia channel and an audio channel, respectively. The multimedia signal transmission circuit 13 and the

audio transmission circuits

14 and 15 include a transmission control unit and a signal transmission unit, respectively. In the present embodiment, a relay circuit is employed as the aforementioned respective signal transmission circuits to form a signal transmission physical channel that can be switched. The relay coil is used as a transmission control part, and the contact switch combination is used as a signal transmission part. The following description will be given taking the multimedia signal transmission circuit 13 as an example.

The coil 131 of the relay is connected to the power supply circuit and the contact switch combination comprises two

stationary contacts

133, 134 and one movable contact 132. In the de-energized state of the relay coil, the movable contact 132 forms a normally closed switch with one of the stationary contacts 134 and a normally open switch with the other stationary contact 133. In the energized state of the relay coil, the movable contact 132 moves away from the stationary contact 134 and into contact with the stationary contact 133, thereby opening the normally closed switch and closing the normally open switch. In this embodiment, the fixed

contacts

133 and 134 are used as signal input terminals to connect two paths of input first and second multimedia signals through the HDMI input interface, respectively, and the moving contact 132 is used as a signal output terminal to output one path of multimedia signal through the HDMI output interface. When the coil 131 of the relay is not energized, the device outputs the first multimedia signal connected to the stationary contact 134, as is known from the contact relationship of the contacts. The first multimedia signal and the second multimedia signal are respectively corresponding to an external network multimedia signal and an internal network multimedia signal.

In this embodiment, the control interface 12 is connected to the power supply loop of the coil 131 of the relay, and the control interface 12 is connected to an external switch button. The external switch button generates a switch signal after being connected with the coil, and controls the movable contact 132 to change the contact point contacted with the movable contact, thereby achieving the purpose of switching transmission signals.

When the multimedia signal output from the audio/video signal isolation device needs to be changed, the switching key is used for switching on the power supply loop of the coil 131 of the relay, the coil 131 of the relay is electrified, the movable contact 132 acts, the movable contact is separated from the fixed contact 134 and is contacted with the fixed contact 133, and therefore the multimedia signal output by the device is a second multimedia signal connected with the fixed contact 133.

The principles of the

audio transmission circuits

14, 15 are the same as those of the multimedia signal transmission circuit 13 and will not be described in detail here.

In order to facilitate signal connection, various corresponding interfaces are arranged in the audio and video signal isolation device provided by the invention. In this embodiment, a High Definition Multimedia Interface (HDMI) is used to connect with the signal terminal in the Multimedia signal transmission circuit 13, and the number of the interfaces is adapted to the number of signal paths.

The multimedia signal transmission circuit 13 further includes

unidirectional transmission circuits

135, 136, 137 connected between the three signal terminals of the multimedia signal transmission unit and the HDMI interface. In one embodiment, MAXIM MAX3814 chips from MAXIM are used as guarantees for unidirectional transmission of multimedia signals. The multimedia signal accessed by the HDMI _ Input2 interface is connected to the signal Input end 134 through the unidirectional transmission circuit 135 formed by the MAX3814 chip, and is Output through the HDMI _ Output interface via the signal Output end 132 and the unidirectional transmission circuit 137. In general, multimedia signals are connected to a display device through an HDMI _ Output interface and a cable, such as playing in a large display screen.

The audio transmission circuit 14 can transmit two different paths of first and second audio signals. Corresponding to the transmitted Audio signal, the Audio/video signal isolation apparatus provided in this embodiment is provided with two Audio _ Input1 interfaces, two Audio _ Input2 interfaces, and three Audio _ Output interfaces. The first and second Audio signals can be Audio signals from different terminals or different networks, and Audio information from different terminals or different networks can be played through an Audio playing device connected with an Audio _ Output interface of the Audio/video signal isolation device.

The audio transmission circuit 15 transmits two different paths of first and second voice signals. Corresponding to the transmitted voice signal, the audio/video signal isolation apparatus provided in this embodiment is provided with three MIC _ Input1 interfaces, three MIC _ Input2 interfaces, and three MIC _ Output interfaces. The voice signal is from a voice acquisition device, such as microphones with various structures and forms, such as microphones built in a computer and a handheld terminal, or various movable or fixed microphones used in a stage or a conference with an amplification function.

In this embodiment, the audio signals of the

audio transmission circuits

14 and 15 need to be switched synchronously with the multimedia signals, so that one end of the relay coil of the

audio transmission circuit

14 or 15 is connected to the control interface 12, so that the control interface 12 is connected to the power supply loop of the coil, and the switching key connected to the control interface can control the multimedia signal transmission circuit 13 and the

audio transmission circuits

14 and 15 to be switched synchronously.

In one application scene, the multimedia signal, the audio signal and the voice signal respectively correspond to two different application scenes, and the switching key can be used for freely switching between the two different application scenes. In order to show which scenario the currently transmitted signal is, in this embodiment a corresponding indicator light circuit 16 is also included. The same circuit structure as the multimedia signal transmission circuit 13 and the

audio transmission circuits

14 and 15, the control interface 12 is connected in the power supply loop of the coil of the relay, the normally closed contact and the normally open contact of the relay are respectively connected with the indicator light, and the moving contact is connected with the power supply. When the audio and video signals of different scenes are switched through the switching key, the multimedia signal, the audio signal and the voice signal are simultaneously switched from the first scene to the second scene, correspondingly, the indicator light which originally indicates the first scene is turned off, and the indicator light which indicates the second scene is turned on.

The signal transmission control circuit is only a specific embodiment, and various signal transmission requirements can be realized by combining the relays and matching with the control interface. As shown in fig. 6, in the case where a plurality of sets of contact switches are controlled simultaneously by one relay control, each of the stationary contacts is connected to one signal Input interface (for example, an HDMI interface), and each of the movable contacts is connected to one signal output interface, and the signals transmitted by the interfaces HDMI _ Input11 and HDMI _ Input12 or the signals transmitted by the interfaces HDMI _ Input21 and HDMI _ Input22 are controlled to be output simultaneously by the operation of the relay coil. When the number of the contact switches is insufficient, the purpose of expanding the contact switches can be achieved by connecting a plurality of relays in parallel. For example, as shown in fig. 7, when two relays are connected in parallel, four sets of signals can be output simultaneously. When the relays continue to be connected in parallel, more output signals can be obtained.

The signal transmission channels shown in fig. 6 and 7 both control the transmission of signals by the same control interface, or control the transmission of signals by different control interfaces as shown in fig. 8. In fig. 8, two signal transmission channels are controlled through the control interface 1 and two signal transmission channels are controlled through the control interface 2, which can be controlled separately. According to the control idea, the audio and video can be independently controlled, for example, a control interface is configured on a multimedia channel, and a control interface is configured on an audio channel, so that various control modes can be realized.

When an Input interface is directly connected to an Output interface, a signal transmission channel which does not need to be switched is obtained, as shown in fig. 9, the signal transmission channel is a multimedia channel formed by directly connecting an interface HDMI _ Input1 and an interface HDMI _ Output1, and a multimedia channel formed by directly connecting an interface HDMI _ Input2 and an interface HDMI _ Output 2.

Each control interface provided in the present embodiment may be connected with one or more switching keys as needed. When multimedia signals, audio signals and voice signals of one of the extranet and the intranet need to be transmitted simultaneously, two keys, for example, an intranet key and an extranet key, may be configured. When the intranet information needs to be transmitted, pressing an intranet key; when the outer network information needs to be transmitted, the outer network key is pressed. Only one outer network key can be configured, the inner network information is transmitted in a default state, and the outer network key is pressed when the outer network information needs to be transmitted.

In another embodiment, if the multimedia signal transmission circuit and the audio signal need to be controlled separately, a respective switch button may be provided, which is not described herein again.

Regarding the switching key, in this embodiment, the audio/video signal isolation device provides a control interface for connecting an external switching key, so as to facilitate remote operation of a control person. However, it will be appreciated by those skilled in the art that the switch key may also be integrated into the device, for example, where the control interface is located. Or, an infrared signal receiver is configured for the switching key and is remotely controlled by a remote controller.

The audio and video signal isolation device provided by the invention is also provided with a shell protector which is used for sensing the structural change of the shell and stopping the output of the signal in response to the forced opening of the shell.

As shown in fig. 5, through AC/DC conversion of the power adapter 100, an AC mains supply of 220V is converted into a DC power of 12V to supply power to the audio/video signal isolation apparatus provided by the present invention. The circuit of the casing protector 18 is connected to the power input terminal, and when it is detected that the casing is forcibly opened, the power supply of the device is cut off, thereby stopping the signal output. The specific circuit of the housing protector 18 is shown in fig. 10. The casing protector comprises a second power supply X20 and a second power supply switch Q2 thereof, a detection switch X19 and a power supply protector F1. Wherein, the detection switch X19 is installed at the connection position of the shell and the shell, when the shell is tightly connected, the detection switch X19 is in an open state, and when the shell is separated, the detection switch X19 is closed. The second power supply X20 is a power supply providing a stable voltage of 3V, and is composed of two batteries of No. 5 connected in series, for example. The second power switch Q2 is a switching triode, the base of which is connected with the second power supply X20 through the detecting switch X19, and the collector is connected with the power supply protector F1 in the power supply loop of the audio/video signal isolating device. The power protector F1 is a fuse of various types, such as a socket type fuse as shown in fig. 10. The 12V power provided by the power adapter 100 passes through the power filter circuit 17 and the power protector F1 to supply power to the circuits in the audio/video signal isolation device, that is, the power source 12V1 in fig. 10 is the power source passing through the casing protector 18 in fig. 5, and supplies power to the control part and other elements of the multimedia signal transmission circuit and other audio transmission circuits.

When the shell is separated and the detection switch X19 is closed, the base of the switch triode Q2 is connected with the second power supply X20, the base current provided by the second power supply X20 enables the switch triode Q2 to enter a saturated state instantly, the collector and the emitter are conducted, so that the second power supply X20 and the power supply protector F1 form a closed circuit loop, the power supply protector F1 is fused due to the instant overlarge current flowing through, the power supply loop of the device is cut off, and the output of signals is interrupted.

Further, the casing protector 18 of the present embodiment further includes an alarm circuit, as shown in fig. 10, one end of the alarm beep is connected to the power supply terminal 12V _ in, i.e., connected to the power adapter 100, and the other end is connected to the negative electrode of the second power supply X20 through the switching transistor Q1. The base of the switching transistor Q1 is connected to the positive terminal of the second power supply X20 through the detection switch X19. When the detection switch X19 is closed, the base current provided by the second power supply X20 for the switching triode Q1 enables the switching triode Q1 to be in a saturated state instantly, the collector and the emitter of the switching triode Q1 are connected, the power supply loop of the alarm is connected, the alarm works, and an alarm is given out. In this embodiment, the alarm is a buzzer, but may be other various types of alarms, such as an audible and visual alarm, a voice alarm, and the like.

In order to prevent the transmitted signal from radiating to the outside through the power line, the device further includes a power filter circuit, such as the power filter circuit 17 in fig. 5, configured to be connected in the device power supply circuit, preventing the power from transmitting the carrier signal. In this embodiment, the power filter circuit adopts a multi-section pi-type LC second-order filter circuit, which is specifically shown in fig. 11. The power supply filter circuit 17 is connected between the device power supply terminal 12V1 and ground, and includes a two-stage LC second-order filter circuit.

Embodiment one of conference System

Fig. 12 is a schematic diagram of a conference system device connection according to a first embodiment of the present invention. In this embodiment, the conference system is, for example, a traffic guidance system, wherein the traffic guidance system includes an internal second network 220, an external first network 230, and corresponding devices. The second network 220 and its devices include a second network host 221, an HDMI signal switcher 222, a conference terminal 223, and a conference microphone 224. The second network host 221 and the conference terminal 223 are connected in the second network 220, the multimedia signal interfaces of the second network host 221 and the conference terminal 223 are respectively connected to two HDMI interfaces serving as signal Input ends of the HDMI signal switch 222, and the HDMI interface serving as a signal output end of the HDMI signal switch 222 is connected to the HDMI _ Input2 interface of the device of the audio/video signal isolation apparatus 200. By switching of the HDMI signal switch 222, the internal multimedia signal from one of the second network host 221 and the conference terminal 223 is displayed in the display screen 240 through the audio/video signal isolation apparatus 200.

The conference microphone 224 is connected to the MIC _ Input2 interface of the audio/video signal isolation apparatus 200, and the MIC _ Output2 interface of the audio/video signal isolation apparatus 200 is connected to the MIC interface of the conference terminal 223. The voice signal generated by the conference microphone 224 is transmitted to the conference terminal 223 through the audio/video signal isolation apparatus 200.

The first network 230 and its devices include a first network host 231, a first network camera 232 and a handheld microphone 233. The first network host 231 is connected to the first network 230, and the HDMI interface of the first network host 231 is connected to the HDMI _ Input1 interface of the device of the audio/video signal isolation apparatus 200. The first network camera 232 is powered by the audio/video signal isolation device 200, is connected to the first network host 231 through a USB cable, and is configured to transmit the collected multimedia information to the first network host 231, and is displayed on the large display screen 240 by the first network host 231 through the HDMI interface when necessary. The microphone 233 is connected to the MIC _ Input1 interface of the audio/video signal isolation apparatus 200, and the MIC _ Output1 interface of the audio/video signal isolation apparatus 200 is connected to the MIC interface of the first network host 231. The voice signal generated by the microphone 233 is transmitted to the first network host 231 through the audio/video signal isolation apparatus 200. In another embodiment, the conference microphone 224 of the second network may be shared by the first network, i.e. the microphone 233 is not needed in the first network device, and when the current scene is switched to the first network, the conference microphone 224 serves as a voice capturing device of the first network.

The control switch box 210 is provided with two keys, which represent a first network and a second network respectively. Which is connected to the control interface of the audio/video signal isolation device 200. The control switch box 210 may be mounted in any suitable location for convenient operation by an operator.

In this embodiment, the scheduling and video conferencing of the two networks are centralized in one location. When a key of the second network representing the intranet in the control switching box 210 is pressed, the control part of each transmission control circuit does not output a switching signal (that is, the relay is not energized and the contact thereof does not operate), and the output signal terminal of each transmission part is connected to the input signal terminal of the second network and disconnected from the input signal terminal of the first network. The HDM I _ Input2 interface and the HDM I _ Output interface of the audio/video signal isolation apparatus 200 are connected to display the audio/video information of the second network on the large display screen 240.

Meanwhile, the audio/video signal isolation device 200 is connected to the MIC _ Input2 interface and the MIC _ Output2 interface, and sends the voice signal generated by the conference microphone 224 to the conference terminal 223 through the audio/video signal isolation device 200.

When a key representing the first network in the control switch box 210 is pressed, the control part of each transmission control circuit sends a switch signal (i.e., the relay is energized to make the contact thereof operate), and the output signal end of each transmission part is disconnected from the input signal end of the second network and is connected to the input signal end of the first network.

The device 200 of the audio/video signal isolation device is connected with the HDMI _ Input1 interface and the HDMI _ Output interface, displays the audio/video information of the first network on the display large screen 240, and simultaneously the audio/video signal isolation device 200 is connected with the MIC _ Input1 interface and the MIC _ Output1 interface, and sends the voice signal generated by the external hand microphone 233 to the first network host through the audio/video signal isolation device 200.

It can be known from the switching process that in the process of the conference, when the information of one network is transmitted, the embodiment is completely physically disconnected from the other network, and the two networks are thoroughly isolated, so that the confidentiality of the information can be ensured.

Embodiment two of the conference System

Fig. 13 is a device connection diagram of an audio-video signal isolation apparatus according to another embodiment of the present invention. In this embodiment, compared with the first application embodiment, the audio/video signal isolation apparatus 300 in this embodiment includes two HDMI input interfaces and two HDMI output interfaces, where each HDMI input interface and one HDMI output interface are directly connected to serve as a multimedia channel (of course, a unidirectional transmission circuit may also be included between the HDMI input interface and the HDMI output interface). Each HDMI output interface is connected with a large display screen. In this embodiment, the two

large display screens

341 and 342 respectively display the multimedia information from the two networks, so that the multimedia signal of each network is separately transmitted through the respective dedicated transmission channel in the audio/video signal isolation device, and is completely and physically isolated in signal transmission.

The audio/video signal isolation device 300 in this embodiment includes two audio channels, referring to fig. 5, which are

audio transmission circuits

14 and 15, respectively. The relay coil of the audio channel is used as a control part, the relay contact is used as a transmission channel, and the audio transmission channel is switched by electrifying and powering off the relay coil.

Wherein, the AUDIO Output interface AUDIO _ Output is connected to the sound box 350. The AUDIO output interface AUDIO in the first network host is connected to the AUDIO Input interface AUDIO _ Input1 of the AUDIO/video signal isolation device 300, and is configured to send an external AUDIO signal to the sound box 350 through the AUDIO/video signal isolation device 300. The AUDIO output interface AUDIO of the conference terminal is connected to the AUDIO Input interface AUDIO _ Input2 of the AUDIO/video signal isolation device 300, and is used for sending the AUDIO signal output by the conference terminal to the sound box 350 through the AUDIO/video signal isolation device 300.

The connection modes of the conference microphone 324, the external microphone 333, the first network camera 332, the first network host 331, the second network host 321, the first network 330, the second network 320, and the like are the same as those of the first embodiment, and are not described herein again.

The control switch box 310 is provided with two keys, which represent the first network and the second network respectively. Which is connected to the control interface of the audio/video signal isolation device 300. The control switch box 310 may be mounted in any suitable location for convenient operation by an operator.

In this embodiment, the scheduling and video conferencing of the two networks are centralized in one location, the device 300 of the av signal isolator displays the av information of the second network on the display large screen 342 through the HDMI _ Input2 interface and the HDM I _ Output2 interface, and displays the multimedia information Output by the first network host on the display large screen 341 through the HDMI _ Input1 interface and the HDMI _ Output1 interface.

When a key representing a second network in the control switch box 310 is pressed, the AUDIO/video signal isolation device 300 connects the AUDIO channels of the AUDIO Input interface MIC _ Input2 and the AUDIO Output interface MIC _ Output2, simultaneously connects the AUDIO channels of the AUDIO Input interface AUDIO _ Input2 and the AUDIO Output interface AUDIO _ Output, and simultaneously cuts off the AUDIO channel of external voice. The voice information generated by the conference microphone 324 is transmitted to the conference terminal 323 through the audio/video signal isolation device 300. The AUDIO information sent by the conference terminal 323 is transmitted to the sound box 350 through the AUDIO Input interface AUDIO _ Input2 and the AUDIO Output interface AUDIO _ Output of the device 300 of the AUDIO/video signal isolation apparatus, and is played through the sound box 350.

When a key representing the first network in the control switch box 210 is pressed, the AUDIO channels of the AUDIO Input interface MIC _ Input1 and the AUDIO Output interface MIC _ Output1 are simultaneously connected and the AUDIO channels of the AUDIO Input interface AUDIO _ Input1 and the AUDIO Output interface AUDIO _ Output are simultaneously connected, and the AUDIO channel of the internal voice is cut off. The voice information generated by the external handset 333 is transmitted to the first network host 331 through the audio/video signal isolation device 300. The first network host 331 transmits the AUDIO information to the sound box 350 through the AUDIO Input interface AUDIO _ Input2 and the AUDIO Output interface AUDIO _ Output of the AUDIO/video signal isolation device 300 through the AUDIO interface, and broadcasts the AUDIO information through the sound box 350.

In the embodiment, the multimedia information of the two networks is respectively displayed on the respective large display screens through the respective physical transmission channels, and the audio information from different networks is played by controlling the connection and disconnection of the audio information transmission channels through the switching key, so that the signal isolation is physically realized, and the confidentiality of the internal information is ensured.

Third embodiment of conference System

Fig. 14 is a device connection diagram of an audio-video signal isolation apparatus according to another embodiment of the present invention. In this embodiment, compared with the first and second application embodiments, the large display screen adopted in this embodiment is formed by splicing eight display sub-screens, and correspondingly, each network further includes a corresponding splicing controller. The first network host 430 sends the multimedia signal to the first network splicing controller 434 through the HDMI interface thereof and outputs a splicing control signal, and the first network splicing controller 434 splits the input multimedia signal according to the display screen, divides the signal into 8 paths of signals and transmits the signals to the HDMI input interfaces HDMI _11-HDMI _18 of the audio/video signal isolation device 400. Similarly, the second network host 420 sends the multimedia signal to the second network splicing controller 424 through the HDMI interface thereof, and the conference terminal 423 outputs a splicing control signal to the second network splicing controller 424, and the second network splicing controller 424 splits the multimedia signal from the second network into 8 channels of signals and transmits the signals to the HDMI input interfaces HDMI _21-HDMI _28 of the audio/video signal isolation apparatus 400. The HDMI output interfaces HDMI _ O1-HDMI _ O8 of the audio/video signal isolation device 400 are respectively connected to eight display sub-screens of the large tiled display screen, and the eight display sub-screens play audio/video information together.

The number of the microphones 424 used in the second network in this embodiment is multiple, and the microphones are respectively connected to the audio Input interface MIC _ Input2 of the audio/video signal isolation apparatus 400 through the audio processing circuit, and are Input to the conference terminal 423 through the audio Output interface MIC _ Output 2.

The multimedia signal transmission control circuit of the audio/video signal isolation device 400 has eight groups of multimedia channels, when the button representing the second network in the control switching box 410 is pressed, the eight groups of input ends of the audio/video signal isolation device of the multimedia channels are connected with the second network and disconnected with the first network, meanwhile, the audio channel is connected with the second network and disconnected with the first network, and the second network indicator light is turned on.

The second network host 420 sends the multimedia signal to the second network splicing controller 424 through the HDMI interface thereof, and the second network splicing controller 424 splits the multimedia signal from the second network into 8 signals and transmits the signals to the HDMI input interfaces HDMI _21-HDMI _28 of the audio/video signal isolation apparatus 400. The multimedia signals of the second network are respectively transmitted to eight display sub-screens of the tiled display large screen 440 via the output interfaces HDMI _ O1-HDMI _ O8 of the audio/video signal isolation device 400, and corresponding video information is displayed in the display sub-screens.

Meanwhile, the device 400 of the AUDIO/video signal isolation apparatus connects the AUDIO channels of the AUDIO Input interface MIC _ Input2 and the AUDIO Output interface MIC _ Output2, connects the AUDIO channels of the AUDIO Input interface AUDIO _ Input2 and the AUDIO Output interface AUDIO _ Output, and simultaneously cuts off the external AUDIO channel. Under the control of the conference terminal 423, voice information generated by one of the conference microphones 424 is transmitted to the conference terminal 423 through the audio/video signal isolation device 400. AUDIO information sent by the conference terminal 423 is transmitted to the sound box 450 through the AUDIO Input interface AUDIO _ Input2 and the AUDIO Output interface AUDIO _ Output of the device 400 of the AUDIO/video signal isolation device by the AUDIO processing circuit and the power amplifier, and is played through the sound box 450.

When a key representing the first network in the control switching box 410 is pressed, the multimedia channel of the audio/video signal isolation device 400 is connected with the first network and disconnected with the second network, and meanwhile, the audio channel is connected with the first network and disconnected with the second network, and the first network indicator lamp is turned on. At this time, the tiled display large screen 440 displays video information of the first network, and audio information from the first network is played in the speaker.

Fourth embodiment of the conference System

Fig. 15 is a schematic diagram of a partial device connection of a conference system according to another embodiment of the present invention. The overall structure of the conference system in this embodiment is the same as that of the conference system in the third embodiment, that is, the tiled display large screen is used as the display device, and other devices and connection structures are similar to those in the third embodiment and are not described again. The difference between the present embodiment and the third embodiment is that a switch array 560 is added between the audio/video signal isolation device 500 and the tiled display screen 540, wherein the switch array comprises a plurality of switch groups 561-. The embodiment adjusts and displays the multimedia information of the split screen through the switch array.

Taking the switch group 561 as an example for explanation, the audio/video signal isolation device 500 outputs 8 paths of multimedia signals, and each path of multimedia signal is connected to a display sub-screen through a switchable normally closed switch. For example, the signals of the 1-4 paths from the left side in the figure are sequentially input into the 4 display split screens from the left to the right of the first row of display split screens, and the signals of the 5-8 paths are sequentially input into the 4 display split screens from the left to the right of the second row of display split screens. In the switch group 561, the first signal switch S11 is connected to the other 7 signal switches S12-S18, respectively, and their connections are switched with each other. For example, in a normal state, the first path of signal output by the audio/video signal isolation device 500 is output to the display split screen D11 through the signal switch S11, the second path of signal is output to the display split screen D12 through the signal switch S12, and similarly, the eighth path of signal is output to the display split screen D18 through the signal switch S18. When the control handles or control keys of the signal switch S11 and the signal switch S12 are pressed, the input end of the signal switch S11 is connected to the output end of the signal switch S12, and the input end of the signal switch S12 is connected to the output end of the signal switch S12, so that the first path of signal output by the audio/video signal isolation device 500 is output to the display split screen D12, and the second path of signal is output to the display split screen D11. Similarly, the display position of the first signal can be exchanged with the original display position of the other signal by the control signal switch S11 and the control handle or the control key of any other signal switch in the same group, so that the original information only displayed on the display split screen D11 is exchanged with the display information of any other display split screen.

Similarly, the other switch groups 562-568 respectively correspond to the switching connection between the signal switch and the other signal switches of the group, so that the display positions of the signal and the other signals on the display split screen can be replaced.

In the present embodiment, through the switch array 560, while the display content of each display divided screen is flexibly changed, no leakage occurs due to the change of the display information.

In this embodiment, various display modes can be realized by matching the splicing controller with the switch array, and taking eight display sub-screens in the figure as an example, different display modes are described:

the first display mode: the first splicing controller 531 splits the original audio/video source into more than one group of splicing signals, wherein each group of splicing signals constitutes one complete original display information. For example, the display information of the first network is split into two splicing signals of six paths and two paths, or split into four splicing signals, two splicing signals and two paths, or split into eight splicing signals, so that a plurality of pieces of all display information are displayed on a large display screen in a split mode. As shown in fig. 16, a display screen Ds1 composed of display split screens D11-13 and D15-D17 displays six pieces of partial information of the total information, and a display screen Ds2 composed of display split screens D14-D18 displays two pieces of partial information of the total information; or as shown in FIG. 17, the display screen Ds1 composed of D11-12 and D15-D16 displays four pieces of partial information of the total information, the display screen Ds2 composed of D13-D17 displays two pieces of partial information of the total information, and the display screen Ds3 composed of D14-D18 displays two pieces of partial information of the total information.

By controlling the switch array 560, the positions of the aforementioned respective displays can be changed, for example, the positions of the display Ds2 and the display Ds3 are replaced, or the display Ds2 and the display Ds1 are replaced.

Second display mode: the first splicing controller 531 splits the original audio/video source into more than one group of splicing signals, wherein the first group of splicing signals (such as one path of signals) form a complete original display information. The other groups of spliced signals respectively form the sub-pictures of the first group of display information, thereby forming the effect of multi-stage amplification. As shown in fig. 18, the display Ds1 displays the entire information of the first network, the display Ds2 displays half of the information in the display Ds1, the display Ds12 displays the entire information of the first network, i.e., it is an enlarged display of the display Ds1, and the display Ds22 displays the entire content of the display Ds2, i.e., an enlarged display of the display Ds 2. Among them, the display positions of the respective displays, such as the positions of the replacement display Ds2 and the display Ds1, and the positions of the replacement display Ds22 and the display Ds12, can be changed by the switch array 560. When the split display of the spliced large screen is dispersedly arranged, the scheme provided by the embodiment can highlight the effect of facilitating the watching of audiences.

In the foregoing embodiments, the first network and the second network may be an external network and an internal network in a company, an enterprise, and an organization, and although the embodiment only shows the case corresponding to two networks, it can be understood that the solution of the present invention may also be applied to the case of a plurality of networks. Corresponding to the condition of a plurality of networks, according to the scheme provided by the invention, the free switching among a plurality of different networks can be realized by arranging the corresponding control key and the corresponding transmission circuit, and different network signals are in a physical isolation state. The audio and video signal isolation device provided by the invention physically isolates audio and video signals transmitted by different networks, can freely switch according to requirements, does not influence the transmission of the audio and video signals, and also ensures the confidentiality of respective network information.

The conference system embodiments I, III and IV are suitable for the application scene of a single command large screen in a single place, namely, internal and external network scheduling and video conference are centralized in one place, and a display large screen is equipped as a command large screen.

The first, third and fourth embodiments of the conference system are also applicable to an application scenario of a single command large screen in two places, that is, a set of conference systems provided by this embodiment is respectively arranged in two places, such as A, B places, that is, the conference system in A, B two places has intranet and intranet scheduling and video conference, and is equipped with a display large screen as a command large screen, and A, B two places can independently command according to intranet and intranet information, and can transmit own information to the opposite party, or receive information from the opposite party, as reference information during command.

The second embodiment of the conference system is suitable for the application scene of a single-place double-command large screen or a double-place double-command large screen. For the application scene of the double command large screens in a single place, internal and external network dispatching and a video conference are centralized in one place, and two large display screens are equipped to be used as command large screens. For the application scenario of the double-command large screen in the double-place, a set of second embodiment of the conference system is set at A, B.

Of course, other scenarios may also be included, for example, at A, B, any one of the first to fourth embodiments described above may be provided with a conference system capable of switching between internal and external networks at location a, and only an intranet conference system may be provided at location B, without switching between internal and external networks.

Those skilled in the art can flexibly configure one or more large display screens, or configure a large spliced screen, configure switching between an internal network and an external network, or not switch between a single network, according to the conference system provided by the present invention.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention, and therefore, all equivalent technical solutions should fall within the scope of the present invention.

Claims

1. A conference system for guaranteeing information security of an intranet comprises:

the audio/video signal isolation device is configured to provide one or more groups of switchable multimedia channels and audio channels for transmitting multimedia signals and audio signals from the internal network and/or the external network respectively;

the display screen is configured to be connected with the multimedia channel of the audio and video signal isolation device and plays the intranet and/or extranet multimedia information transmitted by the audio and video signal isolation device;

the intranet conference equipment is configured to be at least connected with an intranet input end of a multimedia channel of the audio and video signal isolation device and an intranet output end and/or an intranet input end of an audio channel, sends intranet multimedia information to a display screen through the audio and video signal isolation device, and receives or outputs audio information; and

and the external network conference equipment is configured to be at least connected with the multimedia channel external network input end of the audio and video signal isolation device and the external network output end and/or input end of the audio channel, and transmits external network multimedia information to a display screen through the audio and video signal isolation device to receive or output audio information.

2. The system of claim 1, further comprising a switch key configured to switch an input terminal of a multimedia channel and/or an audio channel in the audio/video signal isolation device to be an intranet input terminal or an extranet input terminal.

3. The system of claim 2, wherein the audio-visual signal isolation means comprises:

a housing configured to provide protection for internal circuitry;

a control interface configured to receive a switching signal of the switching key; and

at least more than two signal transmission channels, wherein the at least more than one signal transmission channels comprise a transmission control part and one or more groups of signal transmission parts, and each group of signal transmission parts comprises an internal network input end, an external network input end and a signal output end; the transmission control part is connected with the control interface, and changes the signal input end which is conducted with the signal output end into an internal network input end or an external network input end according to the switching signal.

4. The system of claim 3, wherein the control interface is further configured to connect to the transmit control power supply loop, the power supply loop being switched on or off in response to a received switching signal.

5. The system of claim 3, further comprising a plurality of multimedia signal interfaces, wherein the signal input terminal and the signal output terminal of the multimedia channel are respectively connected to one multimedia signal interface.

6. The system of claim 1, further comprising a plurality of multimedia signal interfaces, wherein two or two sets of multimedia signal input interfaces are directly connected to two or two sets of multimedia signal output interfaces to form two or two sets of multimedia channels for transmitting multimedia signals.

7. The system of claim 5 or 6, wherein the multimedia channel is further configured to further comprise a unidirectional transmission circuit respectively connected between the multimedia signal input interface and the signal input terminal, and between the signal output terminal and the multimedia signal output interface; or the one-way transmission circuit is connected between the multimedia signal input interface and the multimedia signal output interface which are directly communicated.

8. The system according to claim 5 or 6 or wherein the further arrangement comprises at least a plurality of audio interfaces, the audio interfaces being connected to signal inputs, signal outputs of respective audio channels.

9. The system of claim 5, further comprising an indicator light circuit comprising:

the indicating lamp comprises one or more indicating lamp loops, wherein each indicating lamp loop comprises a many-to-one selector switch and a plurality of indicating lamps, a plurality of first switch ends of the selector switch are respectively connected with one indicating lamp, and a second switch end of the selector switch is connected with a power supply; and

and the indication control part is connected with the control interface and changes the first switch end conducted with the second switch end according to the switching signal.

10. The system of claim 3, wherein the signal transmission path includes a signal relay circuit, the transmission control part is a relay coil, and the signal transmission part is a contact switch composed of a plurality of stationary and movable contacts.

11. The system of claim 1, further comprising:

a power filter circuit configured to be connected in the audio video signal isolation device power supply circuit.

12. The system of claim 1, wherein the audio-visual signal isolation device further comprises a housing protector comprising:

a second power supply and a second power switch;

a detection switch configured to be mounted on the housing, the detection switch turning on the second power switch to turn on a second power supply loop when the housing is forcibly opened; and

a power protector configured to be connected in a device supply loop, to be turned off in response to an input current flowing through the power protector exceeding a preset value when the second power supply loop is turned on.

13. The system of claim 12, wherein the housing protector further comprises an alarm circuit comprising:

an alarm configured to be connected in a third power supply loop, alarm in response to the third power supply loop being on; and

an alarm switch configured to be connected in series with the alarm in the third power supply loop; the control end of the alarm switch is connected to the second power supply loop; and when the detection switch is closed and the second power supply circuit is switched on, the alarm switch is switched on, and then the third power supply circuit is switched on.

14. The system of claim 13, wherein the alarm switch and the second power switch are triode switch circuits.

15. The system of claim 13, wherein a third power supply supplies power to the audio-visual signal isolation device or a second power supply or a battery.

16. The system of claim 1, wherein the intranet conferencing device comprises:

the signal switcher is configured to comprise a plurality of input interfaces and output interfaces, and the output interfaces are connected with the intranet input end of the multimedia channel of the audio and video signal isolation device;

the conference terminal is configured with a multimedia signal interface thereof connected with one input interface of the signal switcher, and an audio interface thereof connected with an intranet output end and/or an intranet input end of an audio channel of the audio and video signal isolation device; and

the intranet host is configured with a multimedia signal interface thereof connected with one input interface of the signal switcher and is connected with the intranet to provide intranet multimedia signals.

17. The system of claim 1, further comprising:

and the voice acquisition equipment is configured to be connected with the audio and video signal isolation device and send acquired voice audio information to the intranet conference equipment or the extranet conference equipment through an audio channel of the audio and video signal isolation device.

18. The system of claim 17, wherein the voice collecting device is an intranet and/or extranet voice collecting device that collects voice information from the intranet or extranet, respectively.

19. The system of claim 1, further comprising:

and the audio signal amplification equipment is configured to be connected with the audio channel output end of the audio and video signal isolation device and amplify the audio information from the outer network or the inner network.

20. The system of claim 1, wherein the display screen is one or more, or comprises a plurality of tiled display sub-screens.

21. The system according to claim 20, further comprising an intranet mosaic controller and an extranet mosaic controller, for outputting a corresponding number of mosaic signals to the multimedia channels of the audio/video signal isolation device according to the number of the display split screens; and a plurality of multimedia channel output ends of the audio and video signal isolating device are respectively connected with the plurality of display sub-screens.

22. The system of claim 1, the extranet device comprising an extranet video capture device and an extranet host; the external network host is connected with the multimedia channel external network input end of the audio and video signal isolating device, the audio channel external network input end and/or the external network output end, and the external network video acquisition equipment is connected with the external network host.