CN215300762U - Video and audio isolation switching device - Google Patents
Video and audio isolation switching device Download PDFInfo
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- CN215300762U CN215300762U CN202121940510.9U CN202121940510U CN215300762U CN 215300762 U CN215300762 U CN 215300762U CN 202121940510 U CN202121940510 U CN 202121940510U CN 215300762 U CN215300762 U CN 215300762U
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Abstract
The utility model provides a look audio frequency keeps apart auto-change over device will derive from the audio signal that looks of different networks and carry out the output of alternative under the prerequisite that complete physics kept apart, realizes switching shared display device's function. The isolation switching device mainly comprises control equipment, a control interface, an input interface, a switching unit, an input signal processing unit, an optical signal transmission unit, an output signal processing unit, an output interface and a power supply unit. The device control circuit is completely physically isolated from the signal circuit, no programming element is arranged in the device control circuit, no embedded control program is needed, the safety problems of program tampering, program backdoor and the like do not exist, the device control circuit has the function of preventing reverse signal transmission, and the safety problems of the existing KVM equipment and video matrix are solved. The device has simple structure and high reliability, and has wide application prospect in the fields of video monitoring, conference systems and the like with confidential safety requirements.
Description
Technical Field
The utility model relates to a look audio frequency isolation auto-change over device, this system mainly relate to technical field such as automatic control, look audio signal processing, optical communication.
Background
The KVM equipment and the video matrix are video switching equipment commonly used by a video monitoring system, a server room management system and a video conference system, and can realize that a plurality of video signal sources share USB interface equipment such as display equipment, a keyboard, a mouse and the like. Besides video signals, part of the KVM equipment and the video matrix can also manage and switch a plurality of audio sources, so that the requirement that the plurality of audio sources share the sound box is met. The existing KVM equipment and video matrix generally adopt a video and audio signal switching chip, input video and audio signals are selectively switched in the chip, a control signal interface comprises data interfaces such as an RS232 serial port and a network interface, control signal decoding is realized by built-in embedded system equipment, and the equipment can only meet the user requirements without confidentiality requirements. Under many application environments, signal sources are often divided into internal signal sources and unreliable external signal sources, and because the electrical connection exists inside the switching chip of the existing KVM device and video matrix, the physical isolation between signals cannot be guaranteed, so that the existing internal signal sources and unreliable external signal sources must establish independent video and audio input and output systems, and cannot share equipment, and before one of the systems is used, equipment of the other system must be manually closed, so that the operation is very complicated, and the unified management is not convenient. Therefore, a switching device with a video and audio signal physical isolation function and a function of preventing signal reverse transmission is needed, and the device can share video and audio output and a system on the premise of ensuring security, so that the device is reduced, misoperation can be avoided, and the information security and management capability of the system are effectively improved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a look audio frequency keeps apart auto-change over device will derive from the audio signal that looks of different networks and carry out the output of alternative under the prerequisite that complete physics kept apart, realizes switching shared display device's function. The specific content comprises the following steps: the device is used for A, B physical isolation alternative switching output of two independent video and audio signals, and the purpose that A, B two independent video and audio signal sources share one display device under the physical isolation condition is achieved; the device comprises a control device, a control interface, an input interface, a switching unit, an input signal processing unit, an optical signal transmission unit, an output signal processing unit, an output interface and a power supply unit;
the control equipment comprises an A control button and a B control button which are respectively used for sending control signals for switching to the A state and the B state;
the control interface is connected with the control equipment through a cable and receives a control signal sent by the control equipment;
the input interface comprises A, B input interfaces which are respectively connected with A, B two independent video and audio signal sources through cables;
the switching unit electrically connects the input interface A or B with the input signal processing unit according to the state control signal A or B sent by the control equipment;
the input signal processing unit is responsible for performing compensation processing on the video and audio signals and ensuring the quality of signals transmitted to the optical signal transmission unit;
the optical signal transmission unit comprises an optical signal sending module, an optical fiber and an optical signal receiving module; the optical signal sending module is responsible for converting 4 pairs of differential electric signals of the video and audio signals into 4 paths of optical signals; each path of optical signal is transmitted through 1 optical fiber; the optical signal receiving module is used for receiving 4 paths of optical signals transmitted by optical fibers, converting the 4 paths of optical signals into 4 pairs of differential electrical signals and transmitting the signals to the output signal processing unit;
the output signal processing unit is responsible for compensating 4 pairs of differential electric signals of the video and audio signals and ensuring the quality of signals transmitted to the output interface;
the output interface is connected with the display equipment through a cable, and transmits the video and audio signals to the display equipment for video display and audio playing;
the power supply unit is responsible for supplying power for the control equipment, the switching unit, the input signal processing unit, the optical signal transmission unit, the output signal processing unit and the output interface.
1. The isolated switching device further comprises: the control interface comprises a control equipment identification circuit, the controller identification circuit is responsible for identifying a switching controller matched with the video matrix sharing switching equipment, and when the control interface is not connected with the equipment or is connected with other illegal network equipment, the control power supply does not supply power to the isolation switching device.
2. The isolated switching device further comprises: the power supply unit comprises an inlet power supply module, an outlet power supply module and a control power supply module; the entrance power supply module is responsible for supplying power to the input signal processing unit and the optical signal sending module of the optical signal transmission unit; the outlet power supply module is responsible for supplying power to the output signal processing unit and the optical signal receiving module of the optical signal transmission unit and outputting an interface; and the control power supply module is responsible for supplying power to the control equipment, the control interface and the switching unit.
3. The isolated switching device further comprises: the control power supply module comprises an anti-disassembly protection module; the anti-dismantling protection module is used for preventing the shell of the device from being illegally opened, has the functions of sound alarm and automatic burning of the safety element, and can not continuously work.
4. The isolated switching device further comprises: the inlet power supply module and the outlet power supply module both comprise power supply filtering modules, and the power supply filtering modules are responsible for power supply filtering, filter out carrier signals in a power supply circuit and prevent signals from being transmitted through a power supply.
5. The isolated switching device further comprises: the isolation switching devices can be used in parallel or in series connection, and alternative switching of multiple videos belonging to A, B two groups is achieved.
The isolation switching device has the following characteristics:
1. signals from different video and audio information sources are completely and physically isolated;
2. the control circuit is completely physically isolated from the signal circuit;
3. the device has no programming element and embedded control program, and has no safety problems of program tampering, program backdoor and the like.
4. The device has no data storage element, and has no safety problems that the data of the internal signal source is illegally intercepted, stored, transmitted and the like.
5. The device controls the switching signal to be a level signal, a communication port and a related communication chip are not needed, internal information can be prevented from being leaked through the communication port in a transmission mode, and the safety of the device is further improved.
6. The device has the function of preventing the reverse transmission of signals. The device comprises an optical signal transmission unit, wherein the optical signal transmission unit comprises an optical signal sending module, an optical fiber and an optical signal receiving module, and the optical fiber is used for transmitting optical signals and cannot transmit electric signals. The basic elements of the optical signal sending module and the optical signal receiving module are a light emitting diode and a photosensitive transistor respectively, the light emitting diode does not have the function of receiving signals, and the photosensitive transistor does not have the function of transmitting signals, so that after the electrical signals of the video and audio are transmitted and processed by the optical signal transmission unit, a reverse output channel does not exist, and the signals can be prevented from being reversely transmitted out through the output interface.
7. The signal input circuit, the signal output circuit and the control circuit of the device are respectively provided with independent power supplies which supply power independently, so that signal crosstalk can be prevented and reverse transmission through the power supplies can be prevented.
8. The power supply circuit for signal processing of the device is provided with a filter circuit, so that signals can be prevented from being transmitted through the power supply.
9. The device has the function of identifying the control equipment, can prevent illegal access and control of non-corollary equipment, and can not work when the control interface is not connected with the equipment or is connected with other illegal network equipment, thereby further ensuring the use safety of the device.
Drawings
Fig. 1 is a schematic diagram of an overall functional structure of a video/audio isolation switching device.
Fig. 2 is a schematic circuit diagram of the principle of the tamper protection module.
Fig. 3 is a schematic circuit diagram of the control interface principle.
Fig. 4 is a schematic circuit diagram of a switching unit.
Fig. 5 is a schematic diagram of an input signal processing unit.
Fig. 6 is a schematic diagram of an optical signal transmission unit.
FIG. 7 is a schematic diagram of a parallel installation of multiple isolated switching devices.
FIG. 8 is a schematic view of a series installation of multiple isolated switching devices.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are only some embodiments, 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 application. An embodiment of the overall functional structure of the isolation switching device is shown in fig. 1, and mainly includes:
(100) the control equipment comprises an A control button and a B control button, different level control signals are sent when the A control button and the B control button are pressed, the default A group switching control signal is low level, the default B group switching control signal is high level, and when the device is disconnected from the control equipment, the device cannot work. The control equipment also comprises an identification code signal generating circuit, the generated binary identification code signal is consistent with an identification code set by a controller identification circuit (106) in the device, a special identification code signal generating circuit is required to be designed according to the identification code, and the identification code signal generating circuit can also use a dial switch, but the safety of the identification code signal generating circuit is lower than that of a special circuit scheme.
(101) The control interface terminal is a component of a control interface, adopts an 8-pin RJ45 female socket interface and is connected with a control device (100) through an 8-core twisted pair.
(102) The control power adapter is a component of the control power module and is responsible for providing power input for the control equipment and the control interface and supplying power for the switching element of the switching unit, and the control power adapter adopts an AC/DC adapter with 12V output in the example.
(103) The inlet power adapter is a component of the inlet power module, and the AC/DC adapter with 12V output is adopted in the embodiment.
(104) The outlet power adapter is a component of the inlet power module, and the AC/DC adapter with 12V output is adopted in the embodiment.
(105) The anti-dismantling protection module is a component of the control power supply module, is used for preventing the shell of the device from being illegally opened, has the functions of sound alarm and automatic burning of the safety element, and can not enable the device to continuously work.
(106) The controller identification circuit is a component of the control interface and is responsible for identifying the control equipment, and when the control interface terminal is not connected with the matched special control equipment (100) or is connected with other illegal network equipment, the electrical connection between the input signal power adapter and the output signal power adapter and the power supply unit to which the input signal power adapter and the output signal power adapter are supplied is cut off.
(107) The inlet power supply filtering module and the inlet power supply module are used for filtering the outlet power supply, filtering carrier signals in the power supply circuit, preventing the signals from being transmitted through the power supply, and optionally combining a low-pass filter with a pi-type filter.
(108) The outlet power supply filtering module and the outlet power supply module are used for filtering the outlet power supply, filtering carrier signals in the power supply circuit, preventing the signals from being transmitted through the power supply, and optionally combining a low-pass filter with a pi-type filter.
(109) And the voltage stabilizing modules are components of the inlet power supply module and the outlet power supply module and are responsible for DC/DC conversion and voltage stabilization, and each voltage stabilizing module supplies power for the optical signal sending module, the input signal processing unit, the optical signal receiving module, the output signal processing unit and the output interface.
(110) And the B indicator light is controlled by the switching unit and is turned on when the device is in the B network state.
(111) And the A indicator light is controlled by the switching unit, the indicator light is on when the device is in the A network state, and the device is in the A network state by default after being electrified.
(112) And the power indicator lights are turned on when all the adapters of the device are powered on and are normally connected with the control equipment.
(113) And the A input interface is connected with the A video source through a cable, and the HDMI interface is adopted in the example.
(114) And the B input interface is connected with the B video source through a cable, and the HDMI interface is adopted in the example.
(115) The switching unit, concrete switching executive component can adopt a plurality of relays, the relay power supply is connected with the control power module, the normally closed contact is connected with the network A input interface, the normally open contact is connected with the network B input interface, and the public end is connected with the input signal processing unit (115).
(116) And the input signal processing unit is responsible for performing compensation processing on the video and audio signals and ensuring the quality of the signals transmitted to the optical signal transmission unit.
(117) The optical signal transmitting module is responsible for transmitting and processing the video and audio signal in an optical isolation one-way transmission mode, 4 groups of differential electrical signals of video and audio are converted into optical signals, 4 groups of transmitting units are connected with 4 optical fibers respectively, and 4 groups of optical signals are transmitted through the optical fibers.
(118) And the optical fiber is respectively connected with the optical signal sending module and the optical signal receiving module and is used for transmitting video and audio optical signals.
(119) The optical signal receiving module is responsible for receiving processing of optical isolation one-way transmission of video and audio signals and converts 4 groups of optical signals of video and audio into electric signals, and 4 groups of receiving units are connected with 4 optical fibers respectively in the example.
(120) And the output signal processing unit is responsible for compensating 4 pairs of differential electric signals of the video and audio signals and ensuring the signal quality and the signal transmission distance transmitted to the output interface.
(121) And the output interface is connected with the display screen through a cable to output video and audio, and the HDMI interface is adopted in the example.
The input and output of the example adopt HDMI interface, and the specific implementation can also adopt DVI interface and other interfaces.
The principle circuit of the anti-disassembly protection module is shown in figure 2. The anti-disassembly switch is arranged in the device shell, when the device shell is illegally opened, the anti-disassembly switch is closed, the fuse is in short circuit with the battery, and the fuse of the fuse element is blown, so that the connection between the control power supply adapter (102) and the control power supply circuit is disconnected, the device cannot continue to work, meanwhile, the triode enters a saturation state, and the E pole and the C pole are conducted to supply power for the buzzer to send out sound alarm.
The control interface principle circuit is shown in fig. 3. The control interface comprises a control interface terminal and a controller identification circuit, the control interface terminal (101) is connected with the twisted pair control device (100) through an 8-core, the 8-core connection twisted pair comprises a power supply and a ground wire, and the power supply is connected with the control power supply adapter (102); the 8 cores are connected with 1 transmission control signal in the twisted pair and connected with the switching unit; the 5 twisted-pair lines are used for transmitting 5-bit identification code signals, the 5-bit identification code signals are transmitted to two 4-bit CMOS digital comparators CD4585 which are connected in series, the comparators compare the signals with signals set by a 5-bit dial switch, when the signals are consistent, the corresponding output ports output high levels, and low levels are output through the phase inversion of a phase inverter, so that the action of a relay is controlled, an input signal power adapter (103) and an inlet power supply filtering module (107) are switched on, and an output signal power adapter (104) is connected with an outlet power supply filtering module (108), and the working power supply of the device is ensured. The control interface and the control equipment of the example adopt an 8-pin standard RJ45 interface, the identification code is a 5-bit binary system, other special interfaces can be selected in practical implementation, and the number of the identification code is increased or reduced according to engineering requirements.
The switching cell principle circuit is shown in fig. 4. The control signal sent by the control device (100) is inverted by an inverter and used for controlling 5 relays, 4 relays are used for A, B alternative outputs of video and audio signals (113) and (114), the alternative outputs comprise 3 paths of TMDS _ DATA signals and 1 path of TMDS _ CLOCK signals, and 1 relay is used for controlling A, B indicator lights (111) and (110).
The input signal processing unit is shown in fig. 5, and comprises 4 signal processing units for processing 3 TMDS _ DATA signals and 1 TMDS _ CLOCK signal, each signal processing unit comprises an equalizer, a limiting amplifier and an output driver, and is used for compensating the loss from a video and audio signal source and a cable to an input interface, providing an output signal completely meeting the requirements of DVI/HDMI TMDS, improving the jitter margin of a cable channel at the receiving side of the input interface, effectively reducing the reflection problem between a port and a high-impedance DVI/HDMI output of a general output driver, and simultaneously reducing the output common mode offset to the minimum to ensure the signal transmission quality. The input signal processing unit can be selected from DVI/HDMI TMDS FR4 integrated equalizer chip. The output signal processing unit adopts the same scheme as the input signal processing unit.
The principle of the optical signal transmission unit is shown in fig. 6, and the optical signal transmission unit comprises an optical signal sending module (117), an optical fiber (118) and an optical signal receiving module (119), wherein the optical signal sending module adopts a transmitting laser array module, the optical fiber adopts a multimode optical fiber, and the optical signal receiving module adopts a gallium arsenide PIN photodiode array module.
As shown in fig. 7, a control device (100), a control power adapter (102), an input signal power adapter (103), and an output signal power adapter (104) are connected in parallel. The identification codes of all isolated switching devices need to be the same.
As shown in fig. 8, the common control device (100), the control power adapter (102), the input signal power adapter (103), and the output signal power adapter (104) are directly connected to the first isolation switching device, and the other isolation switching devices are sequentially connected in series via cables for transmitting the input signal power, the output signal power, the control power, and the control signal. Except for the first isolation switching device, other devices may not comprise a tamper protection module (105), a controller identification circuit (106), an outlet power supply filtering module (107), an inlet power supply filtering module (108) and a voltage stabilizing module (109), and required functions and electric energy are provided by the series devices.
Claims (6)
1. A video-audio isolation switching device is characterized in that: the device is used for A, B physical isolation alternative switching output of two independent video and audio signals, and the purpose that A, B two independent video and audio signal sources share one display device under the physical isolation condition is achieved; the device comprises a control device, a control interface, an input interface, a switching unit, an input signal processing unit, an optical signal transmission unit, an output signal processing unit, an output interface and a power supply unit;
the control equipment comprises an A control button and a B control button which are respectively used for sending control signals for switching to the A state and the B state; the control interface is connected with the control equipment through a cable and receives a control signal sent by the control equipment;
the input interface comprises A, B input interfaces which are respectively connected with A, B two independent video and audio signal sources through cables;
the switching unit electrically connects the input interface A or B with the input signal processing unit according to the state control signal A or B sent by the control equipment;
the input signal processing unit is responsible for performing compensation processing on the video and audio signals and ensuring the quality of signals transmitted to the optical signal transmission unit;
the optical signal transmission unit comprises an optical signal sending module, an optical fiber and an optical signal receiving module; the optical signal sending module is responsible for converting 4 pairs of differential electric signals of the video and audio signals into 4 paths of optical signals; each path of optical signal is transmitted through 1 optical fiber; the optical signal receiving module is used for receiving 4 paths of optical signals transmitted by optical fibers, converting the 4 paths of optical signals into 4 pairs of differential electrical signals and transmitting the signals to the output signal processing unit;
the output signal processing unit is responsible for compensating 4 pairs of differential electric signals of the video and audio signals and ensuring the quality of signals transmitted to the output interface;
the output interface is connected with the display equipment through a cable, and transmits the video and audio signals to the display equipment for video display and audio playing;
the power supply unit is responsible for supplying power for the control equipment, the switching unit, the input signal processing unit, the optical signal transmission unit, the output signal processing unit and the output interface.
2. The isolated switching device of claim 1, wherein: the control interface comprises a control equipment identification circuit, the control equipment identification circuit is responsible for identifying a switching controller matched with the video matrix sharing switching equipment, and when the control interface is not connected with the equipment or is connected with other illegal network equipment, the control power supply does not supply power to the isolation switching device.
3. The isolated switching device of claim 1, wherein: the power supply unit comprises an inlet power supply module, an outlet power supply module and a control power supply module; the entrance power supply module is responsible for supplying power to the input signal processing unit and the optical signal sending module of the optical signal transmission unit; the outlet power supply module is responsible for supplying power to the output signal processing unit and the optical signal receiving module of the optical signal transmission unit and outputting an interface; and the control power supply module is responsible for supplying power to the control equipment, the control interface and the switching unit.
4. The isolated switching device of claim 3, wherein: the control power supply module comprises an anti-disassembly protection module; the anti-dismantling protection module is used for preventing the shell of the device from being illegally opened, has the functions of sound alarm and automatic burning of the safety element, and can not continuously work.
5. The isolated switching device of claim 3, wherein: the inlet power supply module and the outlet power supply module both comprise power supply filtering modules, and the power supply filtering modules are responsible for power supply filtering, filter out carrier signals in a power supply circuit and prevent signals from being transmitted through a power supply.
6. The isolated switching device of claim 1, wherein: the isolation switching devices can be used in parallel or in series connection, and alternative switching of multiple videos belonging to A, B two groups is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121940510.9U CN215300762U (en) | 2021-08-18 | 2021-08-18 | Video and audio isolation switching device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121940510.9U CN215300762U (en) | 2021-08-18 | 2021-08-18 | Video and audio isolation switching device |
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| Publication Number | Publication Date |
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| CN215300762U true CN215300762U (en) | 2021-12-24 |
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| CN202121940510.9U Active CN215300762U (en) | 2021-08-18 | 2021-08-18 | Video and audio isolation switching device |
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