CN111309157A - Multifunctional KVM switching device supporting computer expansion mode output - Google Patents
Multifunctional KVM switching device supporting computer expansion mode output Download PDFInfo
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- CN111309157A CN111309157A CN201911413924.3A CN201911413924A CN111309157A CN 111309157 A CN111309157 A CN 111309157A CN 201911413924 A CN201911413924 A CN 201911413924A CN 111309157 A CN111309157 A CN 111309157A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
- G06F3/1438—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display using more than one graphics controller
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- Theoretical Computer Science (AREA)
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Abstract
The invention discloses a multi-functional KVM switching device supporting computer extension mode output, which realizes peripheral signal synchronization through three multi-functional switching modes and can realize remote transmission of signals and interfaces. The switching card is respectively connected with a power supply, a host USB mouse, a USB keyboard, a PS2 mouse, a PS2 keyboard, an audio signal, a video signal and a serial port signal, is connected with two displays through a video cable, can also be connected with peripheral USB equipment through an extended USB interface, is connected with a peripheral power amplifier through an audio power amplifier interface, is connected with a peripheral serial port through a serial port, and realizes multi-mode image switching and audio and video synchronization through physical key switching, PS2 keyboard switching and USB keyboard switching. The invention supports the video signal multifunctional switching of a host expansion mode, video remote transmission, realizes the picture switching of the expansion mode, the switching of various peripheral interfaces of the host such as audio and video synchronization and the like, and has wide application prospect.
Description
Technical Field
The present invention relates to the field of multi-function signal switching display technologies, and in particular, to a multi-function KVM switch device supporting computer expansion mode output.
Background
A KVM switch, also called a multi-computer switch or a KVM switch, is a management device in a network, and KVM is the first letter of three words, Keyboard, Video, and Mouse. The keyboard, the display and the mouse can be used for controlling a plurality of devices. In brief, it is a group of keyboard, display and mouse, which controls 2, 4, 8, 16 or even more computer host computers than 4096. The KVM switch apparatus is widely used because it can control a plurality of hosts through a set of peripheral devices.
The inventor of the present patent application found in long-term practice that the existing KVM switch device has the following disadvantages:
1. the KVM switch in the prior art generally only controls the host video signal and the basic USB and PS2 keyboard and mouse devices, but the device cannot support other peripherals such as serial ports, audio, MIC, external USB such as USB disk, optical drive, and other traditional peripherals.
2. The KVM switch in the prior art generally only has a single-sided switching function of USB, PS2, or a button, but in practical use, if one of the interfaces is physically damaged, the product cannot be used stably and has low reliability.
3. The KVM switch in the prior art is limited by the loss of the signal transmission medium and cannot transmit the signal over a long distance.
4. At present, many hosts support the output of double-display card signals, two paths of signals can be output by adopting double-display cards or adopting an expansion mode, the signals share the same peripheral equipment, thus, two hosts share 2 sets of peripheral equipment and simultaneously output 4 paths of signals, and the KVM device supporting the expansion mode or double-display card image output is absent at present.
In summary, at present, there is a lack of a switching device capable of realizing remote transmission and switching of signals, and the switching device has rich interfaces and diversified switching modes; meanwhile, the KVM switch is compatible with other common external interfaces of the host, such as USB, serial ports, audio, MIC and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a host which can realize that a group of peripheral equipment controls two expansion output signals, and the signals can be transmitted and switched in a long distance, the interfaces are rich, and the switching modes are diversified; meanwhile, the multi-functional KVM switching device is compatible with other common external interfaces of the host, such as USB, serial ports, audio, MIC and the like, and supports the output of the computer expansion mode.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a multi-functional KVM switching apparatus supporting computer extension mode output, it includes switching card and two computer hosts that can export the different video signal of content of two routes at the same time; the switching card is provided with four video signal input ends, two video signal output ends and a computer host conventional interface switching end; each path of video signal output by each computer host is correspondingly connected with a video signal input end on one path of switching card; the video signal input end is connected with a signal enhancement processing module for increasing video signals; a video 4-cut 2 module for switching four paths of videos into two paths and transmitting the two paths of videos to the video signal output end is connected behind the signal enhancement processing module; the output ends of the two paths of video signals are connected with a display; a group of conventional interfaces carried by each computer host can be accessed to the switching card through a conventional interface switching end on the switching card; the conventional interfaces comprise a USB keyboard interface, a USB mouse interface, a PS2 keyboard interface, a PS2 mouse interface, a serial port, an audio interface and an MIC interface; the switching end of the conventional interface is correspondingly connected with a PS2 mouse switch, a USB high-speed switch module, an audio switch and an MIC/RS232 switch; wherein the PS2 mouse switch is connected with a PS2 mouse; the USB high-speed switching module is connected with a USB HUB device, and the USB HUB device is provided with a plurality of signal input interfaces for expanding and connecting USB devices such as a USB keyboard, a CD driver and the like; wherein the audio frequency switch is connected with one path of output with a power amplifier circuit and one path of output without the power amplifier circuit; wherein the MIC/RS232 selector switch is connected with an MIC/RS232 signal input interface; a central processing unit for processing the switching between the video signals and realizing the synchronization between the conventional interface signals and the video signals is arranged in the switching card; the switching card is also connected with a power module; the central processing unit is connected with a human-computer interaction device.
Preferably, the central processing unit comprises two singlechips, wherein one of the singlechips is used for processing the switching of the video signals; the other singlechip is used for realizing the synchronization between the output video signal and signals of other conventional interfaces of the corresponding host; the two singlechips are connected by signals.
Preferably, the single chip microcomputer adopts a chip with the model number of STM32F103 as a main control chip; one of the single-chip computers is also connected with a PS2 keyboard.
Preferably, the computer host adopts an expansion mode or a dual-display card mode for output.
After adopting the structure, the invention has the following beneficial effects:
1. the signal host machine outputs other conventional universal interfaces (the conventional universal interfaces comprise serial ports, audio interfaces and MIC interfaces) besides the video interface, the USB interface and the PS2 interface, so that not only the synchronization of the video signal and the keyboard and the mouse is realized, but also the synchronization of other signals is realized, and the use limit of the conventional KVM is broken through.
2. The 4 paths of video signals output by the 2 front-end hosts are subjected to signal enhancement processing after being accessed by the switching card, so that the remote transmission of the video signals is realized, and the loss of the signals in a transmission path and a long-line transmission process is compensated.
3. The rear-end video interface is connected with two liquid crystal display screens through a video cable, and can display two paths of video pictures simultaneously, so that the extended mode and multi-picture display of the host can be realized by arbitrary combination.
4. The switching card expands the USB interface except the USB keyboard except a USB interface and a PS2 interface of the conventional KVM, facilitates the connection of USB peripheral equipment, such as USB peripheral equipment, a USB flash disk, an optical drive and the like, realizes the complete expansion of the functions of a host computer compared with the conventional KVM, and breaks through the limitation of a single-path USB signal.
5. The switching card also realizes peripheral extension output of other conventional interfaces of the host, such as a serial port, an MIC (many integrated core), an audio power amplifier interface and the like, facilitates the universality of the interface of the signal receiving terminal, and realizes the universality of all interfaces after the remote signal switching of the host.
6. The invention realizes the multifunctional synchronous switching among the PS2 key switching, the USB key switching and the conventional key switching, realizes the redundant design of the switching function and avoids the functional failure caused by physical damage in the use process of a single switching mode.
In summary, the present invention provides a host capable of implementing a set of peripherals to control two expanded output signals, and the signals can be transmitted and switched remotely, and have rich interfaces and diversified switching modes; meanwhile, the multi-functional KVM switching device is compatible with other common external interfaces of the host, such as USB, serial ports, audio, MIC and the like, and supports the output of the computer expansion mode.
Drawings
FIG. 1 is a diagram of the hardware connection of the KVM switch for supporting the computer extended mode output according to the present invention.
FIG. 2 is a schematic block diagram of the KVM switch for supporting the computer extended mode output according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
With reference to fig. 1 and 2, a multi-functional KVM switch supporting computer extension mode output includes a switch card and two computer hosts capable of simultaneously outputting two paths of video signals with different contents; the switching card is provided with four video signal input ends, two video signal output ends and a computer host conventional interface switching end; each path of video signal output by each computer host is correspondingly connected with a video signal input end on one path of switching card; the video signal input end is connected with a signal enhancement processing module for increasing video signals; a video 4-cut 2 module for switching four paths of videos into two paths and transmitting the two paths of videos to the video signal output end is connected behind the signal enhancement processing module; the output ends of the two paths of video signals are connected with a display; a group of conventional interfaces carried by each computer host can be accessed to the switching card through a conventional interface switching end on the switching card; the conventional interfaces comprise a USB keyboard interface, a USB mouse interface, a PS2 keyboard interface, a PS2 mouse interface, a serial port, an audio interface and an MIC interface; the switching end of the conventional interface is correspondingly connected with a PS2 mouse switch, a USB high-speed switch module, an audio switch and an MIC/RS232 switch; wherein the PS2 mouse switch is connected with a PS2 mouse; the USB high-speed switching module is connected with a USB HUB device, and the USB HUB device is provided with a plurality of signal input interfaces for expanding and connecting USB devices such as a USB keyboard, a CD driver and the like; wherein the audio frequency switch is connected with one path of output with a power amplifier circuit and one path of output without the power amplifier circuit; wherein the MIC/RS232 selector switch is connected with an MIC/RS232 signal input interface; a central processing unit for processing the switching between the video signals and realizing the synchronization between the conventional interface signals and the video signals is arranged in the switching card; the switching card is also connected with a power module; the central processing unit is connected with a human-computer interaction device. The central processing unit comprises two singlechips, wherein one of the singlechips is used for processing the switching of video signals; the other singlechip is used for realizing the synchronization between the output video signal and signals of other conventional interfaces of the corresponding host; the two singlechips are connected by signals. The single chip microcomputer adopts a chip with the model number of STM32F103 as a main control chip; one of the single-chip computers is also connected with a PS2 keyboard. The computer host adopts an extension mode or a dual-display card mode for output.
In specific implementation, after video gating, the two video cables can be connected with the liquid crystal display for displaying; the switching card adopts two STM32 singlechips as main control chips, wherein one main control chip is used for connecting PS2 equipment, simulating signal communication of PS2 equipment and a host and detecting key values of PS2 keys; the main control chip is also connected with a signal video signal switching circuit through an IIC bus interface and used for realizing the switching function of 4-channel signal gating 2-channel signals of a video signal, and the other main control chip is used for simulating a USB communication signal, detecting key values of USB keyboard keys, controlling an audio switching chip, controlling an MIC signal, controlling a serial port switching chip and the like; the switching card adopts a 4-channel video equalization circuit to realize the compensation and equalization of signal attenuation signals in the transmission process of 4-channel video signals, can realize the lossless transmission of 30m video signals, greatly improves the transmission distance of the video signals and improves the remote transmission application of the whole KVM product; the switching card adopts a switching circuit, controls a switching chip bus through the singlechip IIC, realizes 2-path signal selection of 4-path video signals, and can also perform signal amplitude and signal link detection equalization processing on the video signals entering the circuit; the switching card adopts a level switching circuit to realize level switching in the transmission process of serial port signals, and realizes the switching of the serial port signals through a switching chip; the switching card adopts the USB switching chip to realize the switching of 2 paths of host USB signals, and simultaneously adopts the USB expansion chip to be used for the peripheral USB interface of the switching card, thereby expanding the limitation that the conventional KVM product only has a single USB mouse keyboard interface, and expanding 4 paths of USB signals to be used for other USB peripheral connections; the switching card realizes an audio switching circuit, can adopt a double-channel analog switch, supports the amplitude of oscillation of a negative signal, allows a signal lower than the ground level to pass through the switch, has the characteristics of break before make, can prevent the signal from being distorted during the transmission across a path, and can reduce the click and crackle of the audio signal during the switching of a power supply. The switching card realizes an MIC switching circuit, double-path MIC signal input, a fixed gain microphone amplifier and integrated bias; the switching card realizes an audio power amplifier circuit, outputs the switched audio signals through an amplifying circuit, can drive a dual-channel power amplifier, and can drive a 15W (per channel) high-efficiency D-class audio power amplifier of a bridge type stereo speaker. Including an adjustable power limiter and a DC detection circuit that measures the frequency and amplitude of a Pulse Width Modulated (PWM) signal and shuts down the output stage if the input capacitor is damaged or if there is a short circuit at the input. In the aspect of circuit power supply, a 12V direct current power supply is adopted as an input power supply; the power supply processing module is used for respectively providing a direct current output of 5V/3A and a direct current output of 3.3V/2A for chips and processors with different requirements. The switching chip and the expansion interface involved in the implementation process are both provided with mature commercially available accessories, and are not described herein again.
After the device is implemented specifically, the device corresponding to the invention can realize the peripheral switching of all functions of a host such as video signal multifunctional switching, video remote transmission, extended mode image switching, audio and video synchronization, USB interface peripheral power amplifier and the like, is used as peripheral equipment of a general computer, and has wide application prospect. Meanwhile, host resources can be saved, multi-picture operation is facilitated, simultaneous parallel operation of multiple paths of contents on a single workbench is achieved, and working efficiency is improved. The method has important significance for multi-picture operation of large enterprises.
The following is particularly emphasized with respect to the differences between the present patent application and the conventional art: in the conventional technology, two hosts respectively provide a frame, and then the hosts are respectively provided with a set of peripherals, and the two frames are freely switched by a KVM switching device, namely 2-to-1 switching. Based on this background, if 4-to-2 switching is to be implemented, the conventional scheme is to use 4 hosts and 4 sets of peripherals, and then switch. The scheme adopted by the patent application creatively outputs two pictures through one host multi-display card, namely, one set of the host dual-display card, so that only 2 hosts and two sets of peripheral equipment are needed, and 2 of the 4 pictures can be freely switched by combining the KVM switching device, so that the number of the hosts and the peripheral equipment is reduced by half.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual configuration is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A multi-function KVM switch for supporting computer expansion mode output, comprising: the switching card and the two computer hosts can simultaneously output two paths of video signals with different contents to the outside; the switching card is provided with four video signal input ends, two video signal output ends and a computer host conventional interface switching end; each path of video signal output by each computer host is correspondingly connected with a video signal input end on one path of switching card; the video signal input end is connected with a signal enhancement processing module for increasing video signals; a video 4-cut 2 module for switching four paths of videos into two paths and transmitting the two paths of videos to the video signal output end is connected behind the signal enhancement processing module; the output ends of the two paths of video signals are connected with a display; a group of conventional interfaces carried by each computer host can be accessed to the switching card through a conventional interface switching end on the switching card; the conventional interfaces comprise a USB keyboard interface, a USB mouse interface, a PS2 keyboard interface, a PS2 mouse interface, a serial port, an audio interface, an MIC interface and the like; the switching end of the conventional interface is correspondingly connected with a PS2 mouse switch, a USB high-speed switch module, an audio switch and an MIC/RS232 switch; wherein the PS2 mouse switch is connected with a PS2 mouse; the USB high-speed switching module is connected with a USB HUB device, and the USB HUB device is provided with a plurality of signal input interfaces for expanding and connecting USB devices such as a USB keyboard, a CD driver and the like; wherein the audio frequency switch is connected with one path of output with a power amplifier circuit and one path of output without the power amplifier circuit; wherein the MIC/RS232 selector switch is connected with an MIC/RS232 signal input interface; a central processing unit for processing the switching between the video signals and realizing the synchronization between the conventional interface signals and the video signals is arranged in the switching card; the switching card is also connected with a power module; the central processing unit is connected with a human-computer interaction device.
2. The KVM switch capable of supporting computer extended mode output of claim 1, wherein: the central processing unit comprises two singlechips, wherein one of the singlechips is used for processing the switching of video signals; the other singlechip is used for realizing the synchronization between the output video signal and signals of other conventional interfaces of the corresponding host; the two singlechips are connected by signals.
3. The KVM switch capable of supporting computer extended mode output of claim 2, wherein: the single chip microcomputer adopts a chip with the model number of STM32F103 as a main control chip; one of the single-chip computers is also connected with a PS2 keyboard.
4. The KVM switch capable of supporting computer extended mode output of claim 1, wherein: the computer host adopts an extension mode or a dual-display card mode for output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911413924.3A CN111309157A (en) | 2019-12-31 | 2019-12-31 | Multifunctional KVM switching device supporting computer expansion mode output |
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| CN201911413924.3A CN111309157A (en) | 2019-12-31 | 2019-12-31 | Multifunctional KVM switching device supporting computer expansion mode output |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111813238A (en) * | 2020-07-21 | 2020-10-23 | 北京计算机技术及应用研究所 | KVM module based on CPCI bus |
| CN114694326A (en) * | 2020-12-29 | 2022-07-01 | 腾讯科技（深圳）有限公司 | Extended display equipment of face payment equipment and face payment system |
| CN115494972A (en) * | 2022-09-26 | 2022-12-20 | 深圳市湘凡科技有限公司 | KVM switcher with data inter-copying function |
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