CN202111728U - Multi-channel audio-video conversion device based on recommended standard (RS) 485 bus - Google Patents
Multi-channel audio-video conversion device based on recommended standard (RS) 485 bus Download PDFInfo
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- CN202111728U CN202111728U CN2011201960842U CN201120196084U CN202111728U CN 202111728 U CN202111728 U CN 202111728U CN 2011201960842 U CN2011201960842 U CN 2011201960842U CN 201120196084 U CN201120196084 U CN 201120196084U CN 202111728 U CN202111728 U CN 202111728U
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Abstract
The utility model relates to audio-video communication technology in the field of security monitoring, in particular to a multi-channel audio-video conversion device based on a recommended standard (RS) 485 bus, which comprises a multi-channel audio interface connected with multi-channel user audio-video communication devices, a multi-channel video interface and a multi-channel RS 485 bus interface connected with an RS 485 bus. The multi-channel RS 485 bus interface is connected with a multi-channel RS 485 controller. The audio interface, the video interface and the RS 485 controller are connected with a communication management module which is connected with a control module. The audio-video conversion device is connected with a monitoring talkback device of a plurality of users to form a star network, and then each conversion device is connected onto the RS 485 bus to form connection between a plurality of the star networks and the RS 485 bus, cost is low, transmission distance is long, a problem that the RS 485 bus can not conduct star net forming is solved, and requirements of audio-video monitoring talkback control of large-scale neighborhoods are met.
Description
Technical field
The utility model relates to the audio frequency and video communication technology of protection and monitor field, especially a kind of multichannel audio-video frequency switching equipment based on RS485.
Background technology
The general 75 Europe coaxial cables that adopt of existing video signal transmission transmit, and cost is high, and the transmission range maximum has only 300-400 rice.Because present building height is increasingly high, and the scale of sub-district is also increasing, use traditional coaxial cable to transmit that not only the cost ascensional range is big, and transmission range also receive great restriction.
RS-485 is a kind of bus-structured communication modes, can be used for the middle distance transfer of data.In protection and monitor field; Can adopt RS485 to carry out the transmission of multichannel audio-video frequency; But the RS485 bus is not supported the network configuration of star, and along with the expansion day by day of present cell sizes, the Surveillance center of property and the audio-video network of each household connect into for a difficult problem.
Summary of the invention
The utility model provides a kind of can guarantee transmission range, can realize the multichannel audio-video frequency switching equipment based on the RS485 bus of star net forming again.
To achieve these goals, the utility model adopts following technical scheme:
It comprises that one connects MCVF multichannel voice frequency interface, the multi-channel video interface of multichannel user audio frequency and video communication apparatus and the multichannel RS485 EBI that is connected with the RS485 bus; Described multichannel RS485 EBI connects multichannel RS485 controller; Described COBBAIF, video interface and RS485 controller connect the communication management module that a control data carries out the bi-directional full-duplex transmission and receives; The communication management module connects a control module; Control module connects an erasable read-only memory, also comprises the power module to the each part mentioned above power supply.
Preferably, described communication management module comprises the multichannel universal asynchronous receiving-transmitting transmission control unit (TCU) that is connected with multichannel RS485 controller, the IOC that is connected with MCVF multichannel voice frequency interface, multi-channel video interface and the interrupt control unit that is connected with IOC respectively at multichannel universal asynchronous receiving-transmitting transmission control unit (TCU).
Preferably, described MCVF multichannel voice frequency interface connects one or more audio frequency simulation matrix modules, and the audio frequency simulation matrix module connects IOC.
Preferably, described multi-channel video interface connects one or more video simulation matrix modules, and the video simulation matrix module connects IOC.
Preferably; Connect through the automatic compensating module of line loss between a plurality of described video simulation matrix modules; The automatic compensating module of line loss is connected to IOC, is provided with the AD sampling module that line loss is sampled between described video simulation matrix module and the master controller.
Owing to adopted technique scheme; The multichannel audio-video frequency switching equipment based on RS485 of the utility model can connect a plurality of users' monitoring talk back equipment and form star network; Then each switching equipment is connected on the RS485 bus; Form being connected of a plurality of stars networking and RS485 bus; Not only solve the problem that original transmission line cost is high, transmission range is short, and solved the problem that the RS485 bus can not be carried out star net forming, satisfied the needs of the audio-video monitoring intercommunication control of large-scale sub-district.
Description of drawings
Fig. 1 is the modular structure sketch map of the switching equipment of the utility model embodiment;
The schematic network structure that Fig. 2 is to use the switching equipment of the utility model to form.
Embodiment
As shown in Figure 1; The multichannel audio-video frequency switching equipment based on RS485 of the utility model embodiment comprises that one connects MCVF multichannel voice frequency interface 1, the multi-channel video interface 2 of multichannel user audio frequency and video communication apparatus and the multichannel RS485 EBI 3 that is connected with the RS485 bus; Described multichannel RS485 EBI 3 connects multichannel RS485 controller 4; Described COBBAIF 1, video interface 2 and RS485 controller 4 connect the communication management module 5 that a control data carries out the bi-directional full-duplex transmission and receives; Communication management module 5 connects a master controller 6; Control module 6 connects an erasable read-only memory (EPROM) 7, also comprises the power module 7 to the each part mentioned above power supply.
Wherein communication management module 5 can have multiple implementation; In the present embodiment, described communication management module 5 comprises the multichannel universal asynchronous receiving-transmitting transmission control unit (TCU) (UART) 51 that is connected with multichannel RS485 controller 4, the IOC 52 that is connected with MCVF multichannel voice frequency interface 1, multi-channel video interface 2 and the interrupt control unit 53 that is connected with IOC 52 respectively at multichannel universal asynchronous receiving-transmitting transmission control unit (TCU) 51.
In the present embodiment, described MCVF multichannel voice frequency interface 1 connects one or more audio frequency simulation matrix modules 8, and audio frequency simulation matrix module 8 connects IOC 52; Described multi-channel video interface 2 connects one or more video simulation matrix modules 9, and video simulation matrix module 9 connects IOC 52.
Present embodiment adopts common 5 types of lines to carry out video transmission, adopts the difference balance mode can significantly lower external common mode disturbances, but when long line; Loss on the circuit must compensate; In order to realize this purpose, in the present embodiment, connect through the automatic compensating module 10 of line loss between a plurality of described video simulation matrix modules 9; The automatic compensating module 10 of line loss is connected to IOC 52; Be provided with the AD sampling module 11 that line loss is sampled between described video simulation matrix module 9 and the master controller 6,, confirm the direction of transmission and carry out corresponding switching by communication earlier because system video is a transmitted in both directions; Carry out the AD conversion then with the loss on definite circuit, thus the amplitude of control compensation.
The embodiment of the utility model is in order to realize the RS485 star net forming, but can not destroy its bus structures, expands a plurality of UART transceivers and RS485 driver as required; Each branch road is with one, is transmitted to other branch road as required after receiving the branch road communication data, has been equivalent to improve the driving force of RS485 like this; Significantly increase is articulated in the number of devices in the system, and technological core is the expansion of a plurality of UART transceivers, and it is lower than adopting traditional proprietary extensions chip cost to adopt CPLD; Attainable UART number is many; Flexibly, revise the number that software can be changed expansion, adopt CPLD can significantly reduce the peripheral logic device simultaneously.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (5)
1. multichannel audio-video frequency switching equipment based on RS485; It is characterized in that: comprise that one connects MCVF multichannel voice frequency interface, the multi-channel video interface of multichannel user audio frequency and video communication apparatus and the multichannel RS485 EBI that is connected with the RS485 bus; Described multichannel RS485 EBI connects multichannel RS485 controller; Described COBBAIF, video interface and RS485 controller connect the communication management module that a control data carries out the bi-directional full-duplex transmission and receives; The communication management module connects a control module, and control module connects an erasable read-only memory, also comprises the power module to the each part mentioned above power supply.
2. the multichannel audio-video frequency switching equipment based on RS485 as claimed in claim 1 is characterized in that: described communication management module comprises the multichannel universal asynchronous receiving-transmitting transmission control unit (TCU) that is connected with multichannel RS485 controller, the IOC that is connected with MCVF multichannel voice frequency interface, multi-channel video interface and the interrupt control unit that is connected with IOC respectively at multichannel universal asynchronous receiving-transmitting transmission control unit (TCU).
3. the multichannel audio-video frequency switching equipment based on RS485 as claimed in claim 2 is characterized in that: described MCVF multichannel voice frequency interface connects one or more audio frequency simulation matrix modules, and the audio frequency simulation matrix module connects IOC.
4. the multichannel audio-video frequency switching equipment based on RS485 as claimed in claim 3 is characterized in that: described multi-channel video interface connects one or more video simulation matrix modules, and the video simulation matrix module connects IOC.
5. the multichannel audio-video frequency switching equipment based on RS485 as claimed in claim 4; It is characterized in that: connect through the automatic compensating module of line loss between a plurality of described video simulation matrix modules; The automatic compensating module of line loss is connected to IOC, is provided with the AD sampling module that line loss is sampled between described video simulation matrix module and the master controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201960842U CN202111728U (en) | 2011-06-10 | 2011-06-10 | Multi-channel audio-video conversion device based on recommended standard (RS) 485 bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201960842U CN202111728U (en) | 2011-06-10 | 2011-06-10 | Multi-channel audio-video conversion device based on recommended standard (RS) 485 bus |
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| Publication Number | Publication Date |
|---|---|
| CN202111728U true CN202111728U (en) | 2012-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201960842U Expired - Lifetime CN202111728U (en) | 2011-06-10 | 2011-06-10 | Multi-channel audio-video conversion device based on recommended standard (RS) 485 bus |
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| CN (1) | CN202111728U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102821018A (en) * | 2011-06-10 | 2012-12-12 | 杨莉 | Multi-channel audio/video (AV) switching device based on RS485 bus |
-
2011
- 2011-06-10 CN CN2011201960842U patent/CN202111728U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102821018A (en) * | 2011-06-10 | 2012-12-12 | 杨莉 | Multi-channel audio/video (AV) switching device based on RS485 bus |
| CN102821018B (en) * | 2011-06-10 | 2015-07-22 | 深圳市华百安智能技术有限公司 | Multi-channel audio/video (AV) switching device based on RS485 bus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120111 Effective date of abandoning: 20150722 |
|
| RGAV | Abandon patent right to avoid regrant |