An audio-video physical isolation device

Abstract

The present application relates to a kind of audio and video physical isolation device, including shell, control interface, at least two above physical signal transmission channel and shell protector;The shell is used to provide protection to internal circuit;The control interface is configured to receive switching signal from switching button;At least one above physical signal transmission channel includes transmission control part and one or more groups of signal transmission part, wherein one of two or more first signal ends of each group of signal transmission part is conducted with a second signal end;Transmission control part is connected with the control interface, changes the first signal end conducted with the second signal end according to the switching signal;The shell protector senses the structural change of shell, and signal output of signal transmission part is stopped in response to the forcible opening of shell.The present application can isolate information from different signal sources, so as to ensure information security.

Description

Technical Field

[0001] This invention relates to network isolation devices, and more particularly to an audio and video physical isolation device. Background Technology

[0002] With the rapid development of society and the economy, internet and computer information technology have risen and permeated all aspects of society. While bringing various conveniences to people, the internet has also posed challenges to information security.

[0003] Most industries, such as finance, transportation, energy, and government agencies, divide their networks into internal and external networks by installing isolation cards or network gateways to ensure the security of internal data and information. The internal network is used for internal office automation, while the external network is used for external information dissemination, access to internet messages, and email communication. To further ensure the security of internal information, various security measures are implemented, such as using firewalls, IPS, and antivirus products to protect the network edge from external threats and encrypting data.

[0004] However, the aforementioned security measures are not suitable for all application scenarios. For example, in some large-scale integrated conference systems, video conferencing using the intranet requires access to the external network to obtain information from it. For instance, conference systems in fire command centers, traffic command centers, and emergency command centers typically include large display screens, microphones, and speakers. During meetings, access to the external network is usually necessary to display external audio and video information, and switching between the intranet and external network as needed. When accessing and switching to the external network, the confidentiality of intranet information must be ensured. However, the aforementioned physical isolation devices, such as isolation cards and network gateways, cannot achieve the switching of audio and video signals between the intranet and external network. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the present invention proposes an audio and video physical isolation device to ensure the secure transmission of audio and video signals from different signal sources.

[0006] To address the aforementioned technical problems, this invention provides an audio / video physical isolation device, comprising a housing, a control interface, at least two physical signal transmission channels, and a housing protector. The housing provides protection for internal circuitry. The control interface is configured to receive a switching signal from a toggle button. Each physical signal transmission channel includes a transmission control unit and one or more sets of signal transmission units, wherein one of two or more first signal terminals in each set of signal transmission units is connected to a second signal terminal. The transmission control unit is connected to the control interface and changes the first signal terminal connected to the second signal terminal according to the switching signal. The housing protector senses structural changes in the housing and stops the signal output of the signal transmission units in response to forced opening of the housing.

[0007] The first signal terminal of the signal transmission unit of this invention is used to connect to a signal source. Corresponding to a second signal terminal, at least two first signal terminals are provided to form physical signal transmission channels with it. Therefore, this invention can connect at least two signal sources that can be switched between each other. The signal source is switched by controlling the first signal terminal connected to the second signal terminal in the signal transmission unit through a switching device (such as a button) connected to the control interface, thereby physically isolating audio and video signals from different signal sources. This invention also includes a housing protector to stop signal transmission and trigger an alarm when the housing is illegally opened, thus preventing unauthorized operation of the device to steal information being transmitted. These measures ensure information security when transmitting information from different signal sources. Attached Figure Description

[0008] The preferred embodiments of the present invention will now be described in further detail with reference to the accompanying drawings, wherein:

[0009] Figure 1 This is a schematic diagram of the external appearance of an audio / video physical isolation device according to an embodiment of the present invention;

[0010] Figure 2 This is a schematic diagram of the front panel of an audio / video physical isolation device according to an embodiment of the present invention;

[0011] Figure 3 This is a schematic diagram of the rear panel of an audio / video physical isolation device according to an embodiment of the present invention;

[0012] Figure 4 This is a circuit diagram of an audio / video physical isolation device according to an embodiment of the present invention;

[0013] Figure 5 This is a circuit diagram of a relay controlling multiple sets of contacts simultaneously, according to an embodiment of the present invention.

[0014] Figure 6This is a circuit diagram illustrating the control of multiple sets of contacts when two relays are connected in parallel according to an embodiment of the present invention.

[0015] Figure 7 This is a circuit diagram showing how two control interfaces control relay contacts according to an embodiment of the present invention.

[0016] Figure 8 This is a schematic diagram of the connection between two signal transmission channels according to an embodiment of the present invention;

[0017] Figure 9 This is a schematic diagram of a housing protector circuit according to an embodiment of the present invention;

[0018] Figure 10 This is a schematic diagram of the detection switch structure in a housing protector according to an embodiment of the present invention;

[0019] Figure 11 This is a schematic diagram showing the positional relationship between the housing and the Hall switch in a housing protector according to an embodiment of the present invention;

[0020] Figure 12 This is a schematic diagram of the sealing structure of the housing of the device to be protected according to an embodiment of the present invention;

[0021] Figure 13 This is a schematic diagram of a detection switch circuit according to an embodiment of the present invention;

[0022] Figure 14 This is a schematic diagram of a double-layered housing of a device to be protected according to an embodiment of the present invention;

[0023] Figure 15 This is a schematic diagram of a double-layered housing of a device to be protected according to another embodiment of the present invention.

[0024] Figure 16 This is a schematic diagram of a power supply filter circuit according to an embodiment of the present invention;

[0025] Figure 17 This is a schematic diagram of the device connection of the audio and video physical isolation device according to the first application embodiment of the present invention;

[0026] Figure 18 This is a schematic diagram of the device connection for the audio / video physical isolation device according to Embodiment 2 of the present invention; and

[0027] Figure 19 This is a schematic diagram of the device connection of the audio and video physical isolation device according to the third application embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized, or structural, logical, or electrical changes may be made to the embodiments of the present application.

[0030] This invention provides an audio / video physical isolation device for physically isolating audio and video signals from different signal sources (such as different networks), thereby ensuring that their respective network information is not leaked. Figure 1 The diagram shown is a schematic representation of the external appearance of an audio / video physical isolation device according to an embodiment of the present invention. In this embodiment, the device includes a housing 1, which includes a front panel and a rear panel. Various interfaces are provided on the panels for receiving audio and video signals. For example... Figure 2 and Figure 3 The diagram shows the structural appearance of the front and rear panels in a specific embodiment. The interior of housing 1 houses the device's circuitry, with various electrical components mounted on an electrical board, which is fixed to the bottom plate of the housing. Depending on the installation and usage location, the housing may also include corresponding structures, such as ventilation holes on the bottom plate, top plate, or side plate; when the bottom plate serves as the mounting surface, a mounting structure is provided on the bottom plate, such as mounting holes on the protruding edge 11, allowing it to be mounted with other equipment via connectors.

[0031] Figure 4 This is a circuit diagram of an audio / video physical isolation device according to an embodiment of the present invention. The audio / video physical isolation device includes at least a control interface 12 and a multimedia signal transmission circuit 13. In this embodiment, it may further include two sets of audio transmission circuits 14 and 15, and an indicator light control circuit 16, as needed. The multimedia signal transmission circuit 13 and the audio transmission circuits 14 and 15 each include a control unit and a signal transmission unit. In this embodiment, a relay circuit is used as each of the aforementioned signal transmission circuits to form a physical signal transmission channel. The relay coil serves as the control unit, and its contact combination serves as the signal transmission unit. The following description uses the multimedia signal transmission circuit 13 as an example.

[0032] The relay coil 131 is connected to the power supply circuit. The contact switch assembly includes two stationary contacts 133 and 134 and one moving contact 132. When the relay coil is de-energized, the moving 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. When the relay coil is energized, the moving contact 132 actuates, moves away from the stationary contact 134, and contacts the stationary contact 133, thereby opening the normally closed switch and closing the normally open switch. In this embodiment, the stationary contacts 133 and 134 are used as signal input terminals to connect to two input multimedia signals, the first and second, via an HDMI input interface, respectively. The moving contact 132 is used as a signal output terminal to output one of the multimedia signals via an HDMI output interface. When the relay coil 131 is not energized, based on the contact relationship, the device outputs the first multimedia signal connected to the stationary contact 134. The first multimedia signal and the second multimedia signal correspond to the external network multimedia signal and the internal network multimedia signal, respectively.

[0033] In this embodiment, the control interface 12 is connected to the power supply circuit of the relay coil 131, and the control interface 12 is connected to an external switching button. After the external switching button turns on the coil, it generates a switching signal, which controls the moving contact 132 to change the contact point it contacts, thereby achieving the purpose of switching the transmission signal.

[0034] When it is necessary to change the multimedia signal output from this device, when the power supply circuit of the relay coil 131 is turned on by switching the button, the relay coil 131 is energized, the moving contact 132 is activated, it is disengaged from the stationary contact 134 and makes contact with the stationary contact 133, so that the multimedia signal output by this device is the second multimedia signal connected to the stationary contact 133.

[0035] The principles of audio transmission circuits 14 and 15 are the same as those of multimedia signal transmission circuit 13, and will not be repeated here.

[0036] To facilitate signal connection, the device provided by this invention is equipped with various corresponding interfaces. In this embodiment, a High Definition Multimedia Interface (HDMI) is used to connect to the signal terminals in the multimedia signal transmission circuit 13. The number of interfaces is adapted to the number of signal channels. For example, in this embodiment, each first signal terminal of the multimedia signal has eight channels, so this device includes 24 HDMI interfaces, namely eight HDMI_Input1 interfaces, eight HDMI_Input2 interfaces, and eight HDMI_Output interfaces.

[0037] The multimedia signal transmission circuit 13 further includes unidirectional transmission circuits 135, 136, and 137, connected between the three signal terminals of the multimedia signal transmission unit and the HDMI interface. In one embodiment, the MAX3814 chip from MAXIM Corporation is used to ensure unidirectional transmission of the multimedia signal. The multimedia signal input through the HDMI_Input2 interface is connected to the first signal terminal 134 via the unidirectional transmission circuit 135 composed of the MAX3814 chip, and then output through the HDMI_Output interface via the second signal terminal 132 and the unidirectional transmission circuit 137. Typically, the multimedia signal is connected to a display device, such as a large display screen, via the HDMI_Output interface and a cable.

[0038] The audio transmission circuit 14 can transmit two different first and second audio signals. Corresponding to the transmitted audio signals, the device provided in this embodiment is equipped with two Audio_Input1 interfaces, two Audio_Input2 interfaces, and two Audio_Output interfaces. The first and second audio signals can be audio signals from different terminals or different networks.

[0039] The audio transmission circuit 15 transmits two different first and second voice signals. Corresponding to the transmitted voice signals, the device provided in this embodiment is equipped with three MIC_Input1 interfaces, three MIC_Input2 interfaces, and three MIC_Output interfaces. The voice signals come from voice acquisition devices, such as microphones of various structures and forms, such as microphones built into computers and handheld terminals, or various movable or fixed microphones used on stages or in conferences with amplification functions.

[0040] In this embodiment, the audio signals of the audio transmission circuits 14 and 15 need to be switched synchronously with the multimedia signals. Therefore, one end of the relay coil of the audio transmission circuits 14 and 15 is connected to the control interface 12, thereby connecting the control interface 12 to the power supply circuit of its coil, so that the switching button connected to the control interface can control the synchronous switching of the multimedia signal transmission circuit 13 and the audio transmission circuits 14 and 15.

[0041] In one application scenario, multimedia signals, audio signals, and voice signals each correspond to two different application scenarios. Users can freely switch between these scenarios using a switching button. To indicate which scenario the currently transmitted signal belongs to, this embodiment also includes a corresponding indicator light circuit 16. Similar to the aforementioned multimedia signal transmission circuit 13 and audio transmission circuits 14 and 15, the control interface 12 is connected to the power supply circuit of the relay coil 131. The normally closed and normally open contacts are connected to indicator lights, and the moving contact is connected to the power supply. When switching between different scenarios using the switching button, the multimedia signal, audio signal, and voice signal simultaneously switch from the first scenario to the second scenario. Correspondingly, the indicator light originally indicating the first scenario turns off, and the indicator light indicating the second scenario turns on.

[0042] The signal transmission control circuit described above is merely a specific embodiment. Various signal transmission requirements can be met by combining relays and using a control interface. For example... Figure 5 The diagram illustrates a scenario where a single relay controls multiple sets of contact switches simultaneously. In this case, each stationary contact is connected to a signal input interface (using an HDMI interface as an example), and each moving contact is connected to a signal output interface. The relay coil's operation controls the simultaneous output of signals transmitted from interfaces HDMI_Input11 and HDMI_Input12, or interfaces HDMI_Input21 and HDMI_Input22. When the number of contact switches is insufficient, multiple relays can be connected in parallel to expand the number of contact switches. For example... Figure 6 As shown, when two relays are connected in parallel, four sets of signals can be output simultaneously. Continuing to connect relays in parallel can yield even more output signals.

[0043] Figure 5 and Figure 6 The signal transmission channels shown are all controlled by the same control interface, and can also be like... Figure 7 As shown, different control interfaces control the transmission of each signal. Figure 7 In this system, two signal transmission channels are controlled via control interface 1, and two signal transmission channels are controlled via control interface 2; both can be controlled independently. Based on this control concept, separate control of audio and video can be achieved. For example, the video signal transmission channel can be configured with one or more control interfaces, and the audio transmission channel can be configured with one or more control interfaces. This allows for various control modes.

[0044] When an input interface is connected to an output interface, a signal transmission channel that does not require switching is obtained, such as Figure 8As shown, it is a multimedia channel formed by directly connecting the HDMI_Input1 and HDMI_Output1 interfaces and a multimedia channel formed by directly connecting the HDMI_Input2 and HDMI_Output2 interfaces.

[0045] Each control interface provided in this embodiment can correspond to one or more switching buttons as needed. When it is necessary to transmit multimedia, signal, audio signal, and voice signal simultaneously in one of two scenarios, two buttons can be configured, each corresponding to a different scenario. For example, when the two scenarios are the intranet and extranet of an enterprise, company, or organization, an intranet button and an extranet button can be configured. When intranet information needs to be transmitted, the intranet button is pressed; when extranet information needs to be transmitted, the extranet button is pressed. Alternatively, only one extranet button can be configured. By default, intranet information is transmitted, and the extranet button is pressed when extranet information needs to be transmitted.

[0046] In another embodiment, if the aforementioned multimedia signal transmission circuit and audio signal transmission circuit need to be controlled separately, their respective switching buttons can also be set, which will not be elaborated here.

[0047] Regarding the switching button, in this embodiment, the device provides a control interface for connecting an external switching button, facilitating remote operation by the controller. However, those skilled in the art will understand that the switching button can also be integrated into the device, for example, by installing the switching button at the location where the control interface is set. Alternatively, an infrared signal receiver can be configured for the switching button, allowing for remote control via a remote controller.

[0048] The device provided by the present invention is further provided with a housing protector for sensing structural changes in the housing and stopping signal output in response to forced opening of the housing.

[0049] like Figure 4 As shown, the AC / DC converter 100 converts the 220V AC mains power to 12V DC power to power the device provided by this invention. The housing protector 18 is connected to the power input terminal; when it detects that the housing has been forcibly opened, it cuts off the power supply to the device, thereby stopping the signal output. The specific circuit is as follows... Figure 9As shown. The housing protector includes a second power supply X20 and its second power switch Q2, a detection switch X19, and a power protector F1. The detection switch X19 is installed at the connection between the housings; when the housings are tightly connected, the detection switch X19 is open; when the housings are separated, the detection switch X19 is closed. The second power supply X20 is a power source providing a stable 3V voltage, for example, composed of two AA batteries connected in series. The second power switch Q2 is a switching transistor; its base is connected to the second power supply X20 through the detection switch X19, and its collector is connected to the power protector F1 in the device's power supply circuit. The power protector F1 is various types of fuses, such as... Figure 9 The socket-type fuse is shown. The 12V power supplied by the power adapter 100 powers the device after passing through the power protector F1. Figure 9 The power supply terminal 12V1 is Figure 4 The power supply terminal of the housing protector 18 supplies power to the control section and other components of the multimedia signal transmission circuit and other audio transmission circuits.

[0050] When the housing is separated, and the detection switch X19 is closed, the base of the switching transistor Q2 is connected to the second power supply X20. The base current provided by the second power supply X20 causes the switching transistor Q2 to enter saturation instantaneously, and the collector and emitter conduct. This causes the second power supply X20 and the power protector F1 to form a closed circuit loop, which causes the power protector F1 to melt due to the instantaneous excessive current flowing through it, thereby cutting off the power supply circuit of this device and interrupting the signal output.

[0051] Furthermore, the housing protector 18 in this embodiment also includes an alarm circuit, such as... Figure 9 As shown, one end of the alarm beep is connected to the 12V_in power supply terminal, i.e., connected to the power adapter 100, and the other end is connected to the negative terminal of the second power supply X20 through a switching transistor Q1. The base of the switching transistor Q1 is connected to the positive terminal of the second power supply X20 through a detection switch X19. When the detection switch X19 is closed, the base current provided by the second power supply X20 to the switching transistor Q1 causes the switching transistor Q1 to momentarily reach saturation. The collector and emitter of the switching transistor Q1 are connected, thus connecting the power supply circuit of the alarm, and the alarm operates, emitting an alarm. In this embodiment, the alarm is a buzzer, but it can also be other types of alarms, such as audible and visual alarms, voice alarms, etc. Alternatively, it can be a detector that emits alarm information and is connected to a relevant monitoring device. When the housing is forcibly opened, the detector emits a high-level signal representing alarm information. After receiving the high-level signal sent by the detector, the monitoring device determines that the housing of the device to be protected is being forcibly opened, and then issues an alarm, such as sending alarm information to relevant personnel or cutting off the power supply to the device.

[0052] Regarding the installation location of the alarm, it can be located either inside the device to be protected or in a place far away from the device to be protected, such as a monitoring room, so that monitoring personnel can immediately obtain alarm information.

[0053] The detection switch involved in this invention is, for example, the D3SH-BIRI model detection switch from OMRON, whose structural schematic diagram is shown below. Figure 10 As shown, it is fixed to a suitable location on the housing via device structure P23, and pins P22 are connected to the circuit. When the housing is in its normal state, the detection switch is in the open state. When the housing is illegally opened, the operating lever P21 of the detection switch is pressed down, causing the detection switch to close, thereby triggering an alarm and disconnecting the device's power supply circuit.

[0054] The aforementioned detection switch can be a limit switch, a micro switch, a proximity switch, or a Hall effect switch. For example... Figure 11 The diagram shows the positional relationship between the housing and the Hall switch. Housings P11 and P12 of the device to be protected are interlocked. The circuitry of the device to be protected and the tamper-proof circuit provided by this invention are mounted on circuit board P13, which is fixed inside housing P12. Hall switch X30 is fixed to circuit board P13. A magnet X31 is mounted on the bottom end of mounting bracket X32 on housing P11. When housing P11 separates from housing P12, mounting bracket X32 moves with housing P11, and the magnet X31 on it approaches Hall switch X30, causing Hall switch X30 to activate.

[0055] The installation principle of proximity switches is similar to that of Hall effect switches. The stop block that enables the proximity switch to turn on is fixed to the housing and moves with the housing. When the housing is opened, the stop block enters the response range of the proximity switch, thereby turning on the proximity switch.

[0056] The detection switch described in this invention can also be a relay contact switch, and with the help of necessary sensors, it can also achieve the function of a detection switch.

[0057] In another embodiment, the housing of the device to be protected has a sealed structure, such as... Figure 12 As shown, a sealing strip P20 is connected between the housings P21 and between the housing P21 and the interface P22, thereby ensuring that the interior of the housing of the device to be protected is a sealed space. Oxygen is removed from the sealed space and inert gas is filled in.

[0058] Figure 13This is a schematic diagram of a detection switch circuit according to an embodiment of the present invention. The detection switch circuit includes an oxygen sensor X40 disposed in a sealed space and a detection switch control circuit. The detection switch control circuit includes a microcontroller X41, a switching transistor X42, and a relay circuit. The relay circuit includes a relay coil X43 and a pair of normally open contacts X44. The signal terminal of the oxygen sensor X40 is connected to one of the input terminals of the microcontroller X41. One output terminal of the microcontroller X41 is connected to the base of the transistor X42. The collector of the transistor X42 is connected to the power supply Vcc. The emitter of the transistor X42 is connected to one end of the relay coil X43, and the other end of the relay coil X43 is grounded. The normally open contact X44 serves as a detection switch, such as... Figure 9 As shown, the first end of the normally open contact X44 is connected to the positive terminal of the second power supply X20, and the second end is connected to the base of the switching transistors Q1 and Q2 through base resistors.

[0059] Oxygen sensor X40, located in a sealed space, sends the sensed oxygen concentration value to microcontroller X41. Microcontroller X41 has a built-in oxygen concentration threshold and compares the sensed oxygen concentration value with the threshold. When the sensed oxygen concentration value is greater than the threshold, microcontroller X41 outputs a high-level signal. Under normal circumstances, the oxygen concentration in the sealed space is very low, and the sensed oxygen concentration value is less than the threshold, so microcontroller X41 does not output anything. However, when the housing is illegally opened, the sealed environment is disrupted, and external oxygen enters the housing. The oxygen concentration sensed by the oxygen sensor exceeds the threshold, and microcontroller X41 outputs a high-level signal, causing transistor X42 to saturate and conduct. This connects the collector and emitter of transistor X42, energizing the relay coil X43 and triggering its normally open contact X44 to close, thus activating the alarm and switching the power supply to the protected device.

[0060] In another embodiment, the housing comprises a double-layered housing, such as Figures 14-15 As shown, the device to be protected includes double-layered housings P31 and P32, dividing the internal space of the device into two spaces. Housings P31 and P32 are sealed together by a sealing strip P30, making one of the spaces a sealed space P310. Figure 14 In the middle, the interior of housing P31 is a sealed space P310, and circuit board P33 is located in the space between housing P31 and housing P32. Figure 15In this design, the space between housings P31 and P32 is a sealed space P310. Various electrical components P34 are mounted on circuit board P33 within the internal space enclosed by housing P31. The sealed space P310 is filled with inert gas, and the oxygen sensor is built into it. The oxygen concentration in the sealed space P310 is lower than a preset concentration. When the housing is opened, outside air enters the sealed space P310, increasing the oxygen concentration. If this concentration exceeds the sensing threshold, the microcontroller outputs a high-level signal to the detection switch, triggering an alarm and cutting off the power to the protected device, thus stopping its operation.

[0061] Due to sealing and other reasons, the inert gas in the sealed space may leak to varying degrees, causing the oxygen concentration in the space to increase and leading to malfunctions. To solve this problem, in another embodiment, an oxygen scavenger can be placed in the sealed space filled with inert gas to maintain the oxygen content in the sealed space below a preset concentration. The oxygen scavenger can be an inorganic matrix-based oxygen scavenger, such as placing reduced iron powder in a small bag and placing it in the sealed space.

[0062] This invention utilizes an anti-tamper circuit within the housing of the device to be protected. When the device is illegally operated, an alarm is triggered, and the power supply circuit of the device is cut off, causing the device to stop working, thereby ensuring the security of data transmission by the device to be protected.

[0063] To prevent communication signals from radiating to the outside world through the power line, this device also includes a power filtering circuit, such as... Figure 4 The power supply filter circuit 17 is configured to connect to the power input terminal and the ground terminal in the power supply circuit of the device to prevent the power supply from transmitting carrier signals. In this embodiment, the power supply filter circuit adopts a multi-section π-type LC second-order filter circuit, specifically as follows: Figure 16 As shown, the power supply filter circuit 17 is connected to the power supply terminal of the device after passing through the AC / DC adapter. The power supply is filtered before supplying power to the device circuit. By filtering the power supply, leakage of audio and video signals transmitted in this device is prevented, thereby ensuring the security of the audio and video information transmitted in this device.

[0064] Application Example 1

[0065] Figure 17This is a schematic diagram of the device connection for the audio-visual physical isolation device according to an application embodiment 1 of the present invention. In this embodiment, the audio-visual physical isolation device is applied in a traffic control system, which 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 to the second network 220. The multimedia signal interfaces of the second network host 221 and the conference terminal 223 are respectively connected to the two HDMI input interfaces of the HDMI signal switcher 222. The HDMI output interface of the HDMI signal switcher 222 is connected to the HDMI_Input2 interface of the audio-visual physical isolation device 200. Through the switching of the HDMI signal switcher 222, the internal multimedia signal from one of the second network host 221 and the conference terminal 223 is displayed on the large display screen 240 via the audio-visual physical isolation device 200.

[0066] The conference microphone 224 is connected to the MIC_Input2 interface of the audio / video physical isolation device 200, and the MIC_Output2 interface of the audio / video physical isolation device 200 is connected to the MIC interface of the conference terminal 223. The voice signal generated by the conference microphone 224 is sent to the conference terminal 223 through the audio / video physical isolation device 200.

[0067] The first network 230 and its devices include a first network host 231, a first network camera 232, and a microphone 233. The first network host 231 is connected to the first network 230, and its HDMI interface is connected to the HDMI_Input1 interface of the audio / video physical isolation device 200. The first network camera 232 is powered by the audio / video physical isolation device 200 and connected to the first network host 231 via a USB cable. It transmits captured multimedia information to the first network host 231, which then displays it on the large display screen 240 via the HDMI interface when needed. The microphone 233 is connected to the MIC_Input1 interface of the audio / video physical isolation device 200, and its MIC_Output1 interface is connected to the MIC interface of the first network host 231. The audio signal generated by the microphone 233 is transmitted to the first network host 231 via the audio / video physical isolation device 200. In another embodiment, the conference microphone 224 of the second network can be shared by the first network, that is, the hand microphone 233 is not needed in the first network device. When switching to the first network in the current scenario, the conference microphone 224 serves as the voice acquisition device of the first network.

[0068] The control switch box 210 has two buttons, representing the first network and the second network respectively. It connects to the control interface of the audio / video physical isolation device 200. The control switch box 210 can be installed in any suitable location for easy operation.

[0069] In this embodiment, the scheduling and video conferencing of the two networks are centralized in one location. When the button representing the second network in the control switching box 210 is pressed, the control units of each transmission control circuit do not output switching information (i.e., the relays are not energized, and their contacts do not operate). The output signal terminals of each transmission unit are connected to the input signal terminals of the second network, while disconnected from the input signal terminals of the first network. The audio and video physical isolation device 200 connects the HDMI 1_Input2 interface and the HDMI_Output interface, displaying the audio and video information of the second network on the large display screen 240.

[0070] At the same time, the audio and video physical isolation device 200 connects 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 and video physical isolation device 200.

[0071] When the button representing the first network in the control switching box 210 is pressed, the control unit of each transmission control circuit sends a switching message (i.e., the relay is energized, causing its contacts to operate), and the output signal terminal of each transmission unit is disconnected from the input signal terminal of the second network, while being connected to the input signal terminal of the first network.

[0072] The audio and video physical isolation device 200 connects to the HDMI_Input1 interface and the HDMI_Output interface to display the audio and video information of the first network on the large display screen 240. At the same time, the audio and video physical isolation device 200 connects to the MIC_Input1 interface and the MIC_Output1 interface to send the voice signal generated by the external microphone 233 to the first network host through the audio and video physical isolation device 200.

[0073] As can be seen from the switching process, in this embodiment, when transmitting information from one network, it is physically disconnected from the other network, completely isolating the two networks, thus ensuring the confidentiality of the information.

[0074] Application Example 2

[0075] Figure 18This is a schematic diagram of the device connection for an audio / video physical isolation device according to another embodiment of the present invention. In this embodiment, compared to Application Embodiment 1, the audio / video physical isolation device 300 includes two HDMI input interfaces and two HDMI output interfaces. Each HDMI input interface and each HDMI output interface are directly connected as a multimedia signal transmission 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 to a large display screen. In this embodiment, two large display screens 341 and 342 respectively display multimedia information from two networks. Therefore, the multimedia signals from each network are transmitted separately in the audio / video physical isolation device through their respective dedicated transmission channels, achieving complete physical isolation in the signal transmission channels.

[0076] The audio / video physical isolation device 300 in this embodiment includes two audio channels and their connectors, see [link / reference]. Figure 4 These are audio transmission circuits 14 and 15, respectively. The audio channel connector is a relay, with the relay coil serving as the control unit and the relay contacts serving as the transmission channel. The audio transmission channel is switched by energizing and de-energizing the relay coil.

[0077] The audio output interface AUDIO_Output is connected to speaker 350. The audio output interface AUDIO in the first network host is connected to the audio input interface AUDIO_Input1 of the audio / video physical isolation device 300, used to send external audio signals to speaker 350 via the audio / video physical 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 physical isolation device 300, used to send audio signals output by the conference terminal to speaker 350 via the audio / video physical isolation device 300.

[0078] The connection methods of the conference microphone 324, external hand microphone 333, first network camera 332, first network host 331, second network host 321, first network 330, and second network 320 are the same as in application embodiment one, and will not be repeated here.

[0079] The control switch box 310 has two buttons, representing the first network and the second network respectively. It connects to the control interface of the audio / video physical isolation device 300. The control switch box 310 can be installed in any suitable location for easy operation.

[0080] In this embodiment, the scheduling and video conferencing of the two networks are centralized in one location. The audio and video physical isolation device 300 displays the audio and video information of the second network on the display screen 342 through the HDMI_Input2 interface and the HDMI_Output2 interface, and displays the multimedia information output by the host of the first network on the display screen 341 through the HDMI_Input1 interface and the HDMI_Output1 interface.

[0081] When the button representing the second network in the control switch box 310 is pressed, the audio / video physical isolation device 300 connects the transmission channels of the audio input interface MIC_Input2 and the audio output interface MIC_Output2, and simultaneously connects the transmission channels of the audio input interface AUDIO_Input2 and the audio output interface AUDIO_Output, while disconnecting the external voice transmission channel. The voice information generated by the conference microphone 324 is sent to the conference terminal 323 via the audio / video physical isolation device 300. The audio information emitted by the conference terminal 323 is transmitted to the speaker 350 through the audio input interface AUDIO_Input2 and the audio output interface AUDIO_Output of the audio / video physical isolation device 300, and is then played back through the speaker 350.

[0082] When the button 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, as are the audio channels of the audio input interface AUDIO_Input1 and the audio output interface AUDIO_Output, while the internal voice audio channel is disconnected. The voice information generated by the external microphone 333 is sent to the first network host 331 via the audio-video signal isolation device 300. The first network host 331 transmits the audio information through the AUDIO interface, via the audio input interface AUDIO_Input2 and the audio output interface AUDIO_Output of the audio-video signal isolation device 300, to the speaker 350 for playback.

[0083] In this embodiment, the multimedia signals from the two networks are displayed on their respective large display screens via their respective physical transmission channels. By switching buttons to control the connection and disconnection of the audio information transmission channels, audio information from different networks can be played. This physically isolates the signals transmitted from different signal sources, ensuring the confidentiality of internal information.

[0084] Application Example 3

[0085] Figure 19This is a schematic diagram of the device connection of an audio-visual physical isolation device according to another embodiment of the present invention. In this embodiment, compared with the first and second embodiments, the large display screen used in this embodiment is composed of eight display sub-screens spliced ​​together. Correspondingly, each network also includes a corresponding splicing controller. The first network host 430 sends the multimedia signal to the first network splicing controller 434 through its HDMI interface and outputs splicing control signals. The first network splicing controller 434 splits the input multimedia signal according to the display screen and sends it to the HDMI input interfaces HDMI_11-HDMI_18 of the audio-visual physical isolation device 400. Similarly, the second network host 420 sends the multimedia signal to the second network splicing controller 424 through its HDMI interface. At the same time, the conference terminal 423 outputs splicing control signals to the second network splicing controller 424. The second network splicing controller 424 splits the multimedia signal from the second network into eight signals and sends them to the HDMI input interfaces HDMI_21-HDMI_28 of the audio-visual physical isolation device 400. The HDMI output interfaces HDMI_O1-HDMI_O8 of the audio-visual physical isolation device 400 are respectively connected to the eight display sub-screens of the splicing display screen, and the eight display sub-screens jointly play audio and video information.

[0086] In this embodiment, the second network uses multiple microphones 424, which are respectively connected to the audio input interface MIC_Input2 of the audio-video physical isolation device 400 through the audio processing circuit, and input to the conference terminal 423 through the audio input interface MIC_Output2.

[0087] The eight second network transmission channels of the multimedia signal transmission control circuit of the audio-visual physical isolation device 400 are connected. When the button representing the second network in the control switching box 410 is pressed, the eight input terminals of the audio-visual signal isolation device of the multimedia channel are connected to the second network and disconnected from the first network, and the second network indicator light is lit.

[0088] The second network host 420 sends multimedia signals to the second network splicing controller 424 via its HDMI interface. The second network splicing controller 424 splits the multimedia signals from the second network into eight signals and sends them to the HDMI input interfaces HDMI_21-HDMI_28 of the audio-visual physical isolation device 400. The multimedia signals from the second network are then transmitted to the eight display sub-screens of the splicing display screen 440 via the output interfaces HDMI_O1-HDMI_O8 of the audio-visual physical isolation device 400, where the corresponding video information is displayed.

[0089] Simultaneously, the audio / video physical isolation device 400 connects the transmission channels of the audio input interface MIC_Input2 and the audio output interface MIC_Output2, and connects the transmission channels of the audio input interface AUDIO_Input2 and the audio output interface AUDIO_Output, while disconnecting the external voice transmission channel. Under the control of the conference terminal 423, the voice information generated by one of the conference microphones 424 is sent to the conference terminal 423 through the audio / video physical isolation device 400. The audio information emitted by the conference terminal 423 is transmitted through the audio input interface AUDIO_Input2 and the audio output interface AUDIO_Output of the audio / video physical isolation device 400, through the audio processing circuit and power amplifier, to the speaker 450, and then played out through the speaker 450.

[0090] When the button representing the first network in the control switch box 410 is pressed, the multimedia channel of the audio / video signal isolation device 400 connects to the first network and disconnects from the second network. Simultaneously, the audio channel connects to the first network and disconnects from the second network, and the first network indicator light illuminates. At this time, the large splicing display screen 440 displays video information from the first network, and the speakers play audio information from the first network.

[0091] In the foregoing embodiments, the first network and the second network can be the external network and internal network of a company, enterprise, or organization. Although this embodiment only shows the case corresponding to two networks, it can be understood that the solution of the present invention can also be applied to the case of multiple networks or multiple signal sources. For the case of multiple signal sources, according to the solution provided by the present invention, by setting corresponding control buttons and corresponding transmission circuits, free switching between multiple different signal sources can be achieved, and information from different signal sources is physically isolated during transmission. Therefore, the audio and video physical isolation device provided by the present invention does not affect the transmission of audio and video signals and also ensures the confidentiality of information from each network.

[0092] The above-described application embodiments are only used to illustrate the application of the audio and video physical isolation device with anti-tamper function provided by the present invention. The various devices, apparatuses and their connection relationships used in the embodiments can be adjusted according to actual needs. For example, the first network camera 232 in application embodiment one and the first network camera 332 in application embodiment two do not need to be powered by the audio and video physical isolation device; or a conference terminal for the first network can be added; or a first network seat and / or a second network seat can be added to receive and process information from the first network and / or the second network.

[0093] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention.

Claims

1. An audio / video physical isolation device, comprising: The housing is configured to provide protection for the internal circuitry; The control interface is configured to receive switching signals from the toggle button; The multimedia signal transmission circuit and the audio transmission circuit each include a control unit and a signal transmission unit. Each signal transmission unit has at least two signal input terminals connected to different audio and video information sources. One of the at least two signal input terminals is connected to one or more signal output terminals to form one or more audio and video channels. The signal output terminal is connected to the display screen as the output terminal of the audio and video channel. The transmission control unit is connected to the control interface and changes the signal input terminal that is connected to the signal output terminal according to the switching signal; the housing protector includes a second power supply, a second power switch, a detection switch, a power protector, an oxygen sensor, and a detection switch control circuit; wherein, the detection switch is mounted on the housing and closes when the housing is forcibly opened; the second power switch is a switching transistor, the base of which is connected to the second power supply through the detection switch, and the collector is connected to the power protector in the device's power supply circuit; the oxygen sensor is connected to the signal input terminal of the detection switch control circuit, and the output terminal of the detection switch control circuit is connected to the detection switch; when the housing is separated, when the detection switch is closed, the base of the switching transistor is connected to the second power supply, and the base current provided by the second power supply causes the switching transistor to momentarily enter a saturated state, the collector and emitter are connected, so that the second power supply and the power protector form a closed circuit loop, and the power protector melts due to the excessive instantaneous current, thereby cutting off the power supply circuit of this device and interrupting the signal output; The housing is a double-layered housing, consisting of a first housing and a second housing, which divides the internal space of the audio-visual physical isolation device into two spaces. The first housing and the second housing are sealed together by a sealing strip, making one of the spaces a sealed space. The sealed space is filled with inert gas, and the oxygen sensor is installed in the sealed space. The circuit board of the audio-visual physical isolation device is installed in the other space. An oxygen scavenger is provided in the sealed space to keep the oxygen content in the sealed space below a preset value. When the oxygen sensor detects that the oxygen concentration exceeds the preset value, the output terminal of the detection switch control circuit is turned on.

2. The apparatus according to claim 1, wherein, by further configuration, the control interface is connected to the power supply circuit of the transmission control unit, and the power supply circuit of the transmission control unit is turned on or off according to a switching signal.

3. The apparatus of claim 1, further comprising a power supply filter circuit configured to be connected in the power supply circuit of the apparatus.

4. The apparatus according to claim 1, wherein it comprises at least a plurality of multimedia signal interfaces, the multimedia signal interfaces being respectively connected to the signal input terminal and signal output terminal of one or more signal transmission units for transmitting multimedia signals.

5. The apparatus according to claim 4, further comprising a plurality of unidirectional transmission circuits, which are 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.

6. The apparatus according to claim 4, wherein it comprises at least a plurality of audio interfaces, the plurality of audio interfaces being respectively connected to a plurality of signal input terminals and signal output terminals of one or more signal transmission units for transmitting audio signals.

7. The apparatus according to claim 6, wherein the audio signal is a voice signal from a voice acquisition device or an audio signal from a second device.

8. The apparatus of claim 1, further comprising an indicator light circuit, which includes: One or more indicator light circuits, wherein each indicator light circuit includes a many-to-one toggle switch and multiple indicator lights, wherein multiple first switch terminals of the toggle switch are respectively connected to an indicator light, and a second switch terminal is connected to a power supply; and The instruction control unit is configured to connect to the control interface and changes the first switch terminal that is connected to the second switch terminal according to the switching signal.

9. The apparatus according to claim 1, wherein the control interface is one or more, and the plurality of control interfaces are respectively connected to the power supply circuit of the transmission control unit of different physical signal transmission channels to independently control the transmission of signals by the physical signal transmission channels.

10. The apparatus according to claim 1, wherein the multimedia signal transmission circuit and the audio transmission circuit are signal relay circuits, the transmission control unit is a relay coil, and the signal transmission unit is a contact switch composed of a plurality of stationary contacts and moving contacts.

11. The apparatus of claim 1, wherein the multimedia signal transmission circuit and the audio transmission circuit include a physical channel directly connected by an input interface and an output interface.

12. The device according to claim 1, wherein the housing protector further includes an alarm circuit comprising: An alarm is configured to be connected to a third power supply circuit and to sound an alarm in response to the connection of the third power supply circuit. as well as An alarm switch is configured to be connected in series with the alarm in the third power supply circuit; the control terminal of the alarm switch is connected in the second power supply circuit; when the detection switch is closed and the second power supply circuit is connected, the alarm switch is turned on, thereby turning on the third power supply circuit.

13. The device according to claim 12, wherein the alarm switch is a transistor switching circuit.

14. The apparatus of claim 12, wherein the third power source is a device power supply, a second power source, or a battery.

15. The apparatus according to claim 1, wherein the detection switch is a limit switch, micro switch, proximity switch or Hall switch with a built-in normally open switch.

16. The apparatus according to claim 1, wherein the detection switch control circuit includes a microcontroller, a third transistor circuit, and a signal relay; the input terminal of the microcontroller is connected to the oxygen sensor to receive the output signal of the oxygen sensor; the output terminal of the microcontroller is connected to the base of the third transistor via a base resistor; the emitter of the third transistor is connected to the coil of the signal relay; the collector and emitter of the third transistor are connected to the power supply terminal of the first power supply; and a pair of normally open contacts of the signal relay serve as the detection switch.

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