CN104580934B - The extended method and device of multi-channel video switch - Google Patents
The extended method and device of multi-channel video switch Download PDFInfo
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- CN104580934B CN104580934B CN201510011760.7A CN201510011760A CN104580934B CN 104580934 B CN104580934 B CN 104580934B CN 201510011760 A CN201510011760 A CN 201510011760A CN 104580934 B CN104580934 B CN 104580934B
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Abstract
The invention discloses a kind of extended method and device of multi-channel video switch, wherein device includes：The video switcher of multiple cascades, is connected with CAN；PC, it is connected with one of video switcher, it is sent to instruct, the video switcher updates address number or the output of switching respective channel vision signal all the way according to the instruction received, or the instruction is packed according to CAN protocol, other video switchers are issued by CAN, other video switchers export vision signal all the way further according to the CAN information updating address number or switching respective channel received.The present invention is easy to the input channel of user's extending video signal on demand, and can easily be managed control to the passage newly accessed.
Description
Technical field
The present invention relates to communication and technical field of video monitoring, it can easily especially extend and manage the defeated of vision signal
Enter the multichannel extending video switching method and device of number of channels.
Background technology
Video monitoring system is used widely in the various aspects that current social is lived, and in such a system, in order to just
In management, cost-effective generally require to come together in multi-channel video signal one computer and shown or data are carried out at analysis
Reason, video switcher play an important role in the process.The general principle of video switcher is that multi-channel video signal is defeated
Enter analog switch, in a manner of manually or automatically switching, synchronization only allow all the way signal exported.
The vision signal input channel quantity of existing video switcher is certain, and letter often be present in many occasions
Number phenomenon that passage is not enough or signalling channel is unnecessary, if simple mutually cascades multiple video switchers to meet port number
Purpose demand, often cause the puzzlements such as cumbersome and output vision signal distortion of passage switching.Need a kind of input channel badly
Convenient extension, signalling channel switching mode simplicity, the video switcher of stable output signal.
The content of the invention
It is an object of the invention to provide a kind of multichannel extending video switching method and device, realization expands according to demand
Suitable vision signal input channel quantity, and can easily switch over.
The present invention is to be up to technical scheme used by goal of the invention：
A kind of expanding unit of multi-channel video switch is provided, including：
The video switcher of multiple cascades, is connected with CAN；
PC, it is connected with one of video switcher, is sent to instruct, the video switcher is according to the instruction received
Renewal address number either switches respective channel and exports vision signal all the way or the instruction is packed according to CAN protocol, passes through
CAN issues other video switchers, and other video switchers are further according to the CAN information updating address number received
Or switching respective channel exports vision signal all the way.
In the expanding unit of multi-channel video switch of the present invention, the video switcher is defeated including being sequentially connected
Input impedance match circuit, N path analoging switch circuit, denoising amplifying circuit and output buffer, the video switcher also wrap
Single chip machine controlling circuit is included, it is connected with N path analoging switch circuits, is also connected with PC and CAN.
In the expanding unit of multi-channel video switch of the present invention, the single chip machine controlling circuit includes master control core
Piece, the main control chip are provided with serial ports and CAN communication interface.
Present invention also offers a kind of extended method of multi-channel video switch, comprise the following steps：
S1, PC send to main video switcher and instructed；
S2, main video switcher update address number or the output of switching respective channel video all the way according to the instruction received
Signal, or the instruction is packed according to CAN protocol, other video switchers are issued by CAN；
S3, other video switchers are defeated according to the CAN information updating address number or switching respective channel received
Go out vision signal all the way.
In method of the present invention, step S2 specifically includes following steps：
Main video switcher receives instruction and by the correctness of the check bit detection data of data in instruction；
If data do not have distortion, start to parse data, judge whether the numberings of the ID in data are consistent with the machine, each regard
Frequency switch is all corresponding with a unique immutable ID numbering and a variable address number；
If being consistent, it is administration order to show the order, the address number address number of the machine being updated in data；
If not being consistent, it is control command to show the order, continue to judge address number in data whether with the machine one
Cause, corresponding signal passage is switched according to address number if consistent, export vision signal all the way；
No matter whether address number in data is consistent with the machine, and all received data are packed according to CAN protocol,
Other video switchers being connected in CAN are sent to by CAN.
In method of the present invention, step S3 specifically includes following steps：
After other video switchers being connected in CAN receive message by CAN, pass through data in message
Check bit detection data correctness, if without distortion, start to parse data, judge ID numberings in data whether with this
Machine is consistent；
If being consistent, it is administration order to show the order, the address number address number of the machine being updated in data；
If not being consistent, it is control command to show the order, continue to judge address number in data whether with the machine one
Cause, corresponding signal passage is switched according to address number if consistent, is otherwise not responding to order.
In method of the present invention, address number is judged in main video switcher or other video switchers
When, successively by turn by the machine address number compared with the address number in data pair, when address in the machine address number and data
When former positions of numbering or whole are consistent, then it is assumed that the address number in data is consistent with the machine address number.
The beneficial effect comprise that：The video switcher of each cascade is connected into CAN in the present invention to be led to
Letter, PC can a video switcher sends instruction thereto by serial ports, and video switcher response instruction simultaneously plays instruction
Bag is broadcast to other video switchers being connected in bus by CAN.The present invention is easy to user's extending video on demand
The input channel of signal, and control, the vision signal low noise of output, low mistake can easily be managed to the passage newly accessed
Very, stability is good.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 be multi-channel video switch of the present invention expanding unit in video switcher structural representation.
Fig. 2 is the schematic diagram of multiple video switcher exploited in communication in one embodiment of the present invention.
Fig. 3 is the schematic diagram that video switcher cascades in one embodiment of the present invention.
Fig. 4 is the program flow diagram that PC communicates with main video switcher.
Fig. 5 is the program flow diagram of message of the video switcher processing from CAN.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
The expanding unit of the multi-channel video switch of the embodiment of the present invention includes：The video switcher of multiple cascades, with
CAN connects；PC, it is connected with one of video switcher, is sent to instruct, the video switcher is according to receiving
Instruction renewal address number either switches respective channel and exports vision signal all the way or the instruction is packed according to CAN protocol,
Other video switchers are issued by CAN, other video switchers are further according to the CAN information updating address received
Numbering or switching respective channel export vision signal all the way.
As shown in figure 1, the expansible video switcher of the multichannel of the embodiment of the present invention is by sending-end impedance match circuit 1, N
Path analoging switch circuit 2, denoising amplifying circuit 3, output buffer 4 and single chip machine controlling circuit 5 form.Multiple signals by
Impedance matching circuit 1 is passed through in each signal input channel input, vision signal is stablized distortionless transmit to N path analoging switch electricity
Road 2, the circuit mainly play switching signal passage, according to the output all the way in the signal of instruction selection N roads, the signal of output
It is unavoidable the problems such as being mingled with some noises and too low signal power to be present, it need to be filtered out by denoising amplifying circuit 3 in signal
Noise, strengthen the power of signal, finally exported via output buffer so that the late-class circuit and front stage circuits of signal output
It is isolated, strengthens the stability of circuit.Single chip machine controlling circuit 5 has the function such as serial communication, CAN communication, can locate
Information of the reason from serial ports or CAN simultaneously controls N path analoging switch circuits, Switch Video signalling channel.
N path analoging switch circuit 2 can be according to demand from the chip for possessing different video signal input channel number, and it is former
Manage similar, because integrated circuit uses modular design philosophy, the change of N path analoging switch circuit 2 is to integrated circuit
Influence and little.Main control chip type selecting in single chip machine controlling circuit 5 is not also fixed, but should at least include serial communication, CAN
The functions such as bus communication.For convenience of explanation, analog switch selects chip MAX440 in the embodiment of the present invention, and the chip is MAXIM
8 PASS VIDEO high-speed, multi-path multiplexing chips of company's production, its switching time is 15ns, is a kind of CMOS integrated circuits.Monolithic
The enhanced series of products of STM32 may be selected in machine main control chip, and STM32 series is based on aiming at requiring high-performance, low cost, low-power consumption
The ARM Cortex-M kernels that specially design of Embedded Application, enhanced serial clock frequency reaches 72MHz, is like product
Middle performance highest product, it has been internally integrated the abundant function such as serial communication, CAN communication.By drawing for STM32 chips
Pin is connected with MAX440 address wire, can control the switching of MAX440 signalling channels.
As shown in Fig. 2 multiple video switchers are connected in parallel in CAN 6, you can one LAN of composition, the office
All switch in the net of domain, which can be sent a message to, can also receive the message from LAN in LAN, but each cut
Parallel operation can select filter message or response message by being parsed to message.Each switch is owned by one uniquely
Constant ID numberings, also possess a variable address number.PC 8 can be by serial ports with being connected to wherein the one of CAN
Individual switch communication, the switch is main switch 7.
The message that PC 8 is sent has two types, and one type is administration order：The order is used for the ground for managing switch
Number location so that each signalling channel is owned by different addresses, convenient that passage is switched over；Another kind of is control command：
The order be used to indicating switch to it is specific certain signalling channel switches over all the way, its vision signal is exported.
As shown in figure 4, the program flow diagram to be communicated for PC 8 with main switch 7, PC 8 sends out the data of certain format
After main switch 7, main switch 7 receives and the correctness of data is detected by check bit in data, if without distortion,
Start to parse data.First determine whether the numberings of the ID in data are consistent with the machine, it is management life to show the order if being consistent
Order, the address number address number of the machine being updated in data；It is control command to show the order if not being consistent, and is continued
Judge whether the address number in data is consistent with the machine, corresponding signal passage is switched according to address number if consistent no matter
Whether consistent all received data are packed is sent to other switch being connected in CAN by CAN.
As shown in figure 5, handling the program flow diagram of the message from CAN for switch, come when switch receives
The correctness of the check bit detection data in data is first passed through from after the message of CAN, if without distortion, starts to parse number
According to.First determine whether the numberings of the ID in data are consistent with the machine, it is administration order to show the order if being consistent, by the machine
Address number is updated to the address number in data；It is control command to show the order if not being consistent, and continues to judge in data
Address number it is whether consistent with the machine, corresponding signal passage is switched according to address number if consistent, is otherwise not responding to order.
As shown in figure 3, when needing extending video signal input channel, by the I/O channel phase level of multiple switch
Connection, and switch is accessed into CAN.Management instruction can be sent by PC 8 easily to each switch and signal to lead to
Road distributes address to control.The naming rule of each address is as follows：Main switch 7 where signal output channels 9 is positioned at cascade
The least significant end of system, is named as A, and its corresponding signal input channel can be sequentially allocated address numbering A1, A2,
A3 is to add a word after the address number of associated channel with each switch address number that master controller mutually cascades
Female B, such as A1B, A2B, it is A1B1, A1B2 that the signalling channel number of the switch of this floor of A3B, which can distribute address,
A1B3 by that analogy, can make each switch and its passage have unique address number.But switch pair
When address number is judged, be successively by turn by the machine address compared with the address in data pair, when the machine address number with
When former positions of address number or whole are consistent in data, just think that the address number in data is consistent with the machine address number,
The corresponding command is performed, does not otherwise perform order.
To sum up, the multichannel extending video switch that the present invention designs convenient, flexible can according to demand be expanded and needed
The channel video signal number wanted, improve the utilization rate of channel video signal；Channel video signal extension side proposed by the present invention
Method can be stablized, effectively multi-channel video is switched over, and cascading also can easily be by computer to each after multiple video switchers
Individual passage is controlled management；The circuit of the video switcher of the present invention can effectively filter out the noise in vision signal, and enhancing is defeated
Go out the power of signal, lift the stability of vision signal.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (6)
- A kind of 1. expanding unit of multi-channel video switch, it is characterised in that including：The video switcher of multiple cascades, is connected with CAN；PC, it is connected with one of video switcher, is sent to instruct, the video switcher updates according to the instruction received Address number either switches respective channel and exports vision signal all the way or the instruction is packed according to CAN protocol, passes through CAN Bus issues other video switchers, other video switchers further according to the CAN information updating address number received or Person switches respective channel output vision signal all the way；The video switcher includes the sending-end impedance matching electricity being sequentially connected Road, N path analoging switch circuit, denoising amplifying circuit and output buffer, the video switcher also include single-chip microcomputer control electricity Road, it is connected with N path analoging switch circuits, is also connected with PC and CAN.
- 2. the expanding unit of multi-channel video switch according to claim 1, it is characterised in that the single-chip microcomputer control electricity Road includes main control chip, and the main control chip is provided with serial ports and CAN communication interface.
- 3. a kind of extended method of the multi-channel video switch based on claim 1, it is characterised in that comprise the following steps：S1, PC send to main video switcher and instructed；S2, main video switcher update address number or the output of switching respective channel video letter all the way according to the instruction received Number, or the instruction is packed according to CAN protocol, other video switchers are issued by CAN；S3, other video switchers are according to the CAN information updating address number or switching respective channel output one received Road vision signal.
- 4. according to the method for claim 3, it is characterised in that step S2 specifically includes following steps：Main video switcher receives instruction and by the correctness of the check bit detection data of data in instruction；If data do not have distortion, start to parse data, judge whether the numberings of the ID in data are consistent with the machine, each video is cut Parallel operation is all corresponding with a unique immutable ID numbering and a variable address number；If being consistent, it is administration order to show the instruction, the address number address number of the machine being updated in data；If not being consistent, it is control command to show the instruction, continues to judge whether the address number in data is consistent with the machine, if It is consistent then corresponding signal passage, output vision signal all the way are switched according to address number；No matter whether address number in data is consistent with the machine, and all received data are packed according to CAN protocol, passed through CAN is sent to other video switchers being connected in CAN.
- 5. according to the method for claim 3, it is characterised in that step S3 specifically includes following steps：After other video switchers being connected in CAN receive message by CAN, pass through the school of data in message Test the correctness of position detection data, if without distortion, start to parse data, judge ID numberings in data whether with the machine phase Symbol；If being consistent, it is administration order to show the instruction, the address number address number of the machine being updated in data；If not being consistent, it is control command to show the instruction, continues to judge whether the address number in data is consistent with the machine, if It is consistent then according to address number switch corresponding signal passage, be otherwise not responding to order.
- 6. the method according to claim 4 or 5, it is characterised in that in main video switcher or other video switchers When judging address number, successively by turn by the machine address number compared with the address number in data pair, when the machine When location numbering is consistent with former positions of address number in data or whole, then it is assumed that the address number in data is compiled with the machine address It is number consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510011760.7A CN104580934B (en) | 2015-01-09 | 2015-01-09 | The extended method and device of multi-channel video switch |
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| CN201510011760.7A CN104580934B (en) | 2015-01-09 | 2015-01-09 | The extended method and device of multi-channel video switch |
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| CN104580934B true CN104580934B (en) | 2017-12-08 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105045742B (en) * | 2015-06-30 | 2018-04-24 | 深圳市茁迩科技发展有限公司 | Cascade communication method and cascade system |
| CN107621798B (en) * | 2017-09-30 | 2020-02-21 | 昆明联诚科技股份有限公司 | Traffic area controller display control method based on one-key occupation technology |
| CN110954825B (en) * | 2019-11-08 | 2023-06-02 | 广州光中科技有限公司 | Dynamometer switcher, cascading device of multiple dynamometer switcher and control method of cascading device |
| CN111064908B (en) * | 2019-12-23 | 2022-05-03 | 深圳市创凯智能股份有限公司 | Signal transmission method, device, equipment and readable storage medium |
| CN111209240B (en) * | 2019-12-23 | 2021-08-03 | 深圳优地科技有限公司 | Data transmission method, electronic equipment and storage medium |
| CN111246145A (en) * | 2020-03-10 | 2020-06-05 | 山东超越数控电子股份有限公司 | Multi-path display extension method based on single chip microcomputer |
| CN112437330A (en) * | 2020-11-09 | 2021-03-02 | 天津卓创润兴科技有限公司 | Safe and stable video acquisition system |
| CN113382181B (en) * | 2021-06-10 | 2023-12-15 | 合肥市华宇半导体有限公司 | Digital distributor for converting DP into HDMI chip |
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