CN112291487A

CN112291487A - Large-screen audio and video playing system

Info

Publication number: CN112291487A
Application number: CN202011209442.9A
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 large-screen audio and video playing system, which comprises an audio and video signal isolating device, a large-size display screen, a plurality of audio and video information sources and a switching device, wherein the audio and video signal isolating device is configured to provide a plurality of audio and video channels capable of switching the audio and video information sources, and the corresponding audio and video channels are switched on according to a switching signal; the large-size display screen is configured to be connected with the output end of the audio and video channel of the audio and video signal isolation device and plays audio and video information transmitted by the audio and video signal isolation device; the audio and video information sources are configured to be respectively connected with the input ends of the audio and video channels of the audio and video signal isolation device; the switching device is configured to be connected with the audio and video signal isolation device so as to output a switching signal for switching the audio and video information source. The invention ensures the safety and no leakage during information transmission by isolating the audio/video information from different sources.

Description

Large-screen audio and video playing system

Technical Field

The invention relates to the technical field of network information security, in particular to a large-screen audio and video playing system.

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 large-screen audio and video playing system which ensures the safety and no leakage during information transmission by isolating audio and video information from different sources.

In order to solve the technical problem, the invention provides a large-screen audio and video playing system, which comprises an audio and video signal isolating device, a large-size display screen, a plurality of audio and video information sources and a switching device, wherein the audio and video signal isolating device is used for isolating audio and video signals; the audio and video signal isolation device is configured to provide a plurality of audio and video channels capable of switching audio and video information sources, and corresponding audio and video channels are connected according to switching signals; the large-size display screen is configured to be connected with the output end of the audio and video channel of the audio and video signal isolation device and plays audio and video information transmitted by the audio and video signal isolation device; the audio and video information sources are configured to be respectively connected with the input ends of the audio and video channels of the audio and video signal isolation device; the switching device is configured to be connected with the audio and video signal isolation device so as to output a switching signal for switching the audio and video information source to the switching device.

The invention can play the audio and video information of different audio and video information sources, and can switch or play the audio and video information sources simultaneously according to the requirement; the invention adopts the physical isolation channel to transmit the audio and video information of different audio and video information sources, thereby ensuring the confidentiality of the respective information.

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 schematic block diagram of a large-screen audio-video playing according to an 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 playing system of the present invention;

fig. 13 is a schematic diagram of the connection of the second device according to the second embodiment of the playing system of the present invention;

fig. 14 is a schematic diagram of device connections of a third embodiment of the playback system according to the present invention;

fig. 15 is a schematic diagram of a connection of a part of the devices according to the fourth embodiment of the playing system of the present 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 large-screen audio and video playing system, which is a schematic block diagram of the large-screen audio and video playing system according to an embodiment of the invention, as shown in fig. 1. The playing system at least comprises an audio and video signal isolation device 1a, a first audio and video information source 2a, a second audio and video information source 3a, a large-size display screen 4a and a switching device 5 a. Wherein, the audio/video signal isolation device 1a is configured to provide a plurality of audio/video channels which can switch different audio/video information sources. In the figure, the thick solid line transmits multimedia signals, and the dotted line indicates switching signals. The first audio and video information source 2a and the second audio and video information source 3a are configured to be connected with two input ends of the same audio and video channel of the audio and video signal isolation device, and the display screen 4a is configured to be connected with an output end of the audio and video channel of the audio and video signal isolation device 1 a. The switching device 5a is connected with the audio and video signal isolation device 1a and sends a switching signal for switching the audio and video signal source to the audio and video signal isolation device 1a, and the audio and video signal isolation device 1a communicates the output end of the audio and video channel with one input end of the audio and video channel corresponding to the audio and video signal source according to the switching signal, so that the audio and video signal corresponding to the audio and video signal source is output to the large-size display screen 4a to be displayed or played.

The invention physically isolates the transmission channels of the audio and video signals of different sources through the audio and video signal isolation device 1a, thereby ensuring that the respective 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 place, the bottom plate, the top plate or the side plate is provided with heat dissipation holes, and when the bottom plate is taken as an installation surface, the bottom plate is provided with an installation structure, for example, the protruding edge 11 is provided with an installation hole, and the installation structure is installed together 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 and 15 include a 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 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 a pair of normally closed and normally open switches, which share a moving 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.

In this embodiment, the control interface 12 is connected to a power supply loop of the coil 131 of the relay, the control interface 12 is connected to an external switch key, and the external switch key switches the audio/video signal output from the device. 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 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 2 Audio _ Input1 interfaces, 2 Audio _ Input2 interfaces, and 2 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 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, wherein the normally closed contact and the normally open contact 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 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 transistor, the base of which is connected to the second power source X20 through the detecting switch X19, and the collector of which is connected to the power protector F1 in the device power supply loop. The power protector F1 is a fuse of various types, as shown in fig. 10, a socket type fuse. The 12V power provided by the power adapter 100 passes through the power protector F1 to power the device, i.e. the power source 12V1 in fig. 10 is the power source passing through the casing protector 18 in fig. 5, which 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 communication signal from being radiated 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 to prevent 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 the Play System

Fig. 12 is a schematic diagram of a connection of a playing system device according to a first embodiment of the application. In this embodiment, the playing system relates to 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, the HDMI signal switch 222, the conference terminal 223, and the conference microphone 224 may serve as an audio/video signal source, and the external first network 230 and corresponding devices may serve as another audio/video signal source.

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 as signal Input ends of the HDMI signal switcher 222, and the HDMI interface as a signal output end of the HDMI signal switcher 222 is connected to the HDMI _ Input2 interface of the device of the audio/video signal isolation apparatus 200. By switching the HDMI signal switch 222, the internal multimedia signal from one of the second network host 221 and the conference terminal 223 is displayed on the display screen 240 through the audio/video signal isolation device 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 acquired image information to the first network host 231, and is displayed on the large display screen 240 by the first network host 231 through the HDM I 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 the conference microphone 224 serves as a voice device of the first network when switching to the first network in the current scenario.

The control switch box 210 serves as a switch device, and two keys are arranged on the control switch box and represent a first network and a second network respectively. The two keys are connected with 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 of the two networks, the video conference, and the playing of the information are centralized in one location. When a key representing the second network is pressed in the control switching box 210, the control part of each transmission control circuit does not output switching information (i.e., the relay is not energized and its contact does not operate), and the signal output end of each transmission part is connected to the signal input end connected to the second network and disconnected from the signal input end connected to the first network. The device 200 of the audio/video signal isolation apparatus connects the HDMI _ Input2 interface and the HDMI _ Output interface, and displays the audio/video information of the second network on the large display screen 240, or plays the video image on the large display screen 240.

Meanwhile, the device 200 of the audio/video signal isolation apparatus 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 apparatus 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 out switching information (i.e. the relay is electrified to make the contact point act), and the output signal end of each transmission part is disconnected with the input signal end of the second network and is connected with the input signal end of the first network.

The device 200 of the audio/video signal isolation device is connected with the HDM I _ Input1 interface and the HDM I _ Output interface, displays the audio/video information of the first network on the display large screen 240, and simultaneously, the device 200 of the audio/video signal isolation device is connected with the MIC _ Input1 interface and the MIC _ Output1 interface, and sends the voice signal generated by the external 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 playing information, when the information output of one of the networks is played or displayed, the present embodiment is completely physically disconnected from the other network, and the two networks are completely isolated, so that the confidentiality of information can be ensured.

Second embodiment of the Play System

Fig. 13 is a device connection diagram of a playback system 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 signal transmission channel (of course, a unidirectional transmission circuit is further included between the HDMI input interface and the HDMI output interface). Each HDMI output interface is connected with a large display screen. In the embodiment, the two large display screens display or play the multimedia information from the two networks, so that the multimedia signals of each network are independently transmitted in the audio/video signal isolation device through respective special transmission channels, and are completely and physically isolated on the transmission channels of the signals.

The audio/video signal isolation device 300 in this embodiment includes two audio channels, referring to fig. 4, 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.

The playing system further includes an AUDIO amplifying device, such as a sound box 350 in the figure, and an AUDIO Output interface AUDIO _ Output of the AUDIO/video signal isolating device 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 used for sending the 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 of the two networks and the playing of the audio and video are centralized in one location, the device 300 of the audio and video signal isolation apparatus displays the audio and video information of the second network on the display large screen 342 through the transmission channel between the HDMI _ Input2 interface and the HDMI _ Output2 interface, and displays the multimedia information Output by the first network host on the display large screen 341 through the transmission channel between the HDM I _ Input1 interface and the HDMI _ Output1 interface.

When a key representing a second network in the control switch box 310 is pressed, the device 300 of the AUDIO/video signal isolation apparatus connects transmission channels of the AUDIO Input interface MIC _ Input2 and the AUDIO Output interface MIC _ Output2, and connects transmission channels of the AUDIO Input interface AUDIO _ Input2 and the AUDIO Output interface AUDIO _ Output, and simultaneously cuts off an external voice transmission channel. 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 transmission channels of the AUDIO Input interface MIC _ Input1 and the AUDIO Output interface MIC _ Output1 are connected, the transmission channels of the AUDIO Input interface AUDIO _ Input1 and the AUDIO Output interface AUDIO _ Output are simultaneously connected, and the internal AUDIO transmission channel 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 Output 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 signals of the two networks respectively play multimedia information on the respective display large screens through the respective physical transmission channels, and the audio information of 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 respective information is ensured.

Third embodiment of the Play System

Fig. 14 is a schematic diagram of a connection of a playback system device 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 Input 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. Since the transmission channel is turned on at this time, the multimedia signals of the second network are respectively transmitted to the eight display sub-screens of the large tiled display screen 440 via the output interfaces HDMI _ O1-HDMI _ O8 of the audio/video signal isolation apparatus 400, and the corresponding video information is displayed in the display sub-screens.

Meanwhile, the device 400 of the AUDIO/video signal isolation apparatus connects the transmission channels of the AUDIO Input interface MIC _ Input2 and the AUDIO Output interface MIC _ Output2, connects the transmission channels of the AUDIO Input interface AUDIO _ Input2 and the AUDIO Output interface AUDIO _ Output, and simultaneously cuts off the external voice transmission 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 Play System

Fig. 15 is a schematic diagram of a part of the device connections of the playback system according to another embodiment of the present invention. The playing system in this embodiment is the same as the playing 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 signal switch S11 and the control handle or the control button of the signal switch S12 are controlled, the input terminal of the signal switch S11 may be connected to the output terminal of the signal switch S12, and the input terminal of the signal switch S12 may be connected to the output terminal of the signal switch S12, so that the first path of signal output by the audio/video signal isolation apparatus 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 corresponding signal by controlling the signal switch S11 and the control handle or the control key of any other signal switch in the same group, so that the information originally displayed only on the display split screen D11 can be exchanged with 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 Ds2, respectively. 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 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 large screen audio and video playing system comprises:

the audio and video signal isolation device is configured to provide a plurality of audio and video channels capable of switching audio and video information sources and to switch on the corresponding audio and video channels according to the switching signals;

the large-size display screen is configured to be connected with the output end of the audio and video channel of the audio and video signal isolation device and plays audio and video information transmitted by the audio and video signal isolation device;

the audio and video signal isolation device comprises a plurality of audio and video information sources, a plurality of audio and video signal isolation devices and a control device, wherein the audio and video information sources are configured to be respectively connected with the input ends of audio and video channels of the audio and video signal isolation device; and

and the switching device is configured to be connected with the audio and video signal isolation device so as to output a switching signal for switching the audio and video information source.

2. The system of claim 1, 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 device; and

the system comprises at least two or more signal transmission channels, at least one signal transmission channel is configured to comprise a transmission control part and one or more groups of signal transmission parts, wherein two or more signal input ends of each group of signal transmission parts are connected with different audio and video information sources, one of the two or more signal input ends is communicated with one or more signal output ends to form one or more audio and video channels, and the signal output end is used as the output end of the audio and video channel and is connected with a large-size display screen; the transmission control part is connected with the control interface and changes a signal input end communicated with a signal output end according to the switching signal.

3. The system of claim 2, wherein the control interface is further configured to connect to a transmit control power supply loop of more than one signal transmission channel, the transmit control power supply loops being turned on or off simultaneously in accordance with a switching signal.

4. The system of claim 2, wherein at least a plurality of multimedia signal interfaces are included, and the multimedia signal interfaces are respectively connected with the input end and the output end of the audio/video channel to form one or more multimedia channels for transmitting multimedia signals.

5. The system of claim 4, wherein the multimedia channel further comprises a unidirectional transmission circuit respectively connected between the multimedia signal interface and the multimedia channel input, and between the multimedia channel output and the multimedia signal output interface.

6. The system of claim 4, wherein at least a plurality of audio interfaces are included, and the plurality of audio interfaces are respectively connected with the input end and the output end of the audio-video channel to form a plurality of audio channels for transmitting audio signals.

7. The system of claim 2, 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.

8. The system of claim 2, wherein the signal transmission path includes a signal relay circuit, the transmission control section is a relay coil, the signal input terminal is a stationary contact, and the signal output terminal is a movable contact.

9. The system of claim 2, wherein the audiovisual information sources comprise:

a first network host configured to connect with one or more first multimedia signal interfaces of a multimedia channel input of the audio/video signal isolation device and/or to connect with a first audio interface of an audio channel of the audio/video signal isolation device;

the second network host is configured to be connected with one or more second multimedia signal interfaces at the multimedia channel input end of the audio and video signal isolation device and/or connected with a second audio interface of an audio channel of the audio and video signal isolation device; and

one or more voice capture devices configured to connect with one or more audio input interfaces of an audio channel of the audio-video signal isolation apparatus.

10. The system of claim 9, wherein the audiovisual information source further comprises:

one or more multimedia signal output interfaces of the media signal switcher are connected with one or more first/second multimedia signal interfaces at the multimedia channel input end of the audio/video signal isolating device; the second multimedia signal input interface of the media signal switcher is connected with the first network host or the second network host; and

one or more conference terminals configured to be connected to the first multimedia signal input interface of the media signal switch, wherein the audio input interface and the audio output interface of the one or more conference terminals are respectively connected to the audio output interface and the audio input interface of the corresponding audio channel in the audio/video signal isolation device.

11. The system of claim 1, further comprising: one or more audio signal amplification devices configured to connect with one or more audio output interfaces of an audio channel of the audio-video signal isolation apparatus.

12. The system of claim 1, wherein the audio-video channel comprises a physical channel in direct communication by an input interface and an output interface.

13. The system of claim 1, wherein the large-sized display screens are one or more.

14. The system of claim 1, wherein the large display screen is a tiled large screen comprised of multiple display sub-screens.

15. The system of claim 14, further comprising a splicing controller for outputting a corresponding number of spliced video information to a plurality of audio/video channel inputs of the audio/video signal isolation device according to the number of display split screens; and a plurality of audio and video channel output ends of the audio and video signal isolation device are respectively connected with the plurality of display sub-screens.

16. The system of claim 1, wherein the switching device comprises one or more switching keys or a remote control.