CN206743423U - A kind of difference video signal multiplexing card - Google Patents
A kind of difference video signal multiplexing card Download PDFInfo
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- CN206743423U CN206743423U CN201621027471.2U CN201621027471U CN206743423U CN 206743423 U CN206743423 U CN 206743423U CN 201621027471 U CN201621027471 U CN 201621027471U CN 206743423 U CN206743423 U CN 206743423U
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Abstract
The utility model belongs to avionics, is related to a kind of difference video signal multiplexing card.The difference video signal multiplexing card includes video matrix switch circuit, video signal conversion circuit, output self-detection circuit and the power supply circuit for power supply.Wherein, the video matrix switch circuit has video cross-point switch chip, its input receives outside 2 road PAL signals, output end is connected with video signal conversion circuit, video signal conversion circuit output exports after connector, the output self-detection circuit is connected with connector, and external connection monitors.Single-ended PAL vision signals can be converted to difference PAL vision signals by the utility model difference video signal multiplexing card, and input signal is multiplexed with by multiple signals by video matrix switch circuit and exported, it is its reasonable in design, economy, reliable operation, easy to operate, the testing requirement of airborne video record device can be effectively met, there is larger actual application value.
Description
Technical field
The utility model belongs to avionics, is related to a kind of difference video signal multiplexing card.
Background technology
Airborne video record device is the Aerial Electronic Equipment of vision signal on acquisition and recording aircraft, video recorder gathered one
The conventional vision signal of kind is difference pal mode videoblankingsync.Therefore the test to airborne video record device needs to use difference
Divide PAL video signal source devices, and multi-channel test signal to be provided simultaneously.Video signal source device general at present can only be defeated
Go out single-ended PAL signals, and output channel is mostly single channel, it is impossible to meet the testing requirement of airborne video record device, it is therefore desirable to
Develop a kind of difference video signal multiplexing card.
Utility model content
Purpose of utility model：A kind of single-ended PAL vision signals are provided and are converted to difference PAL vision signals, and pass through video
Input signal is multiplexed with the board of multiple signals output by switch matrix circuit.
Technical scheme：A kind of difference video signal multiplexing card, it includes video matrix switch circuit, vision signal turns
Circuit, output self-detection circuit and the power supply circuit for power supply are changed, wherein, the video matrix switch circuit has video
Cross point switches chip, its input receive outside 2 road PAL signals, and output end is connected with video signal conversion circuit, video letter
The output of number change-over circuit exports after connector, and the output self-detection circuit is connected with connector, and external connection monitors.
The video matrix switch circuit includes a piece of AD8108 video cross-point switch chip.
The AD8108 video cross-point switch chip gives 2 tunnel input signal any switching laws to 8 tunnel output signals
The video signal conversion circuit includes three AD8146 wideband video differential drivers in parallel.
Two panels AD8146 wideband video differential drivers in described three AD8146 wideband video differential drivers in parallel
The conversion of 3 road signals, the conversion of another 2 road signals of progress are carried out respectively.
The power supply circuit introduces power supply by golden finger from the PCI slot of industrial computer, has ICL7660 power supply changeover devices
Chip.
The output self-detection circuit includes the AD813 video amplifiers and BNC socket being connected with each other.
The video cross-point switch chip is connected by the parallel port of parallel port socket and industrial computer, and is controlled by it.
Beneficial effect：The utility model difference video signal multiplexing card can be by single-ended PAL vision signals (as simulated
The signal of formula camera output) difference PAL vision signals are converted to, and be multiplexed input signal by video matrix switch circuit
Exported for multiple signals, it is its reasonable in design, economy, reliable operation, easy to operate, it can effectively meet airborne video record device
Testing requirement, can as collection difference PAL vision signals airborne video record device universal tester.
Brief description of the drawings
Fig. 1 is the utility model difference video signal multiplexing card structure block diagram；
Fig. 2 is the utility model difference video signal multiplexing card operating diagram；
Fig. 3 is the utility model difference video signal multiplexing card Autonomous test schematic diagram,
Wherein, 1-AD8108 video cross-point switch chip, 2-AD8146 wideband videos differential driver, 3-AD813 are regarded
Audio amplifier, 4-ICL7660 power supply changeover devices chip, 5-BNC sockets, 6-DB25 connectors, 7- parallel ports socket, 8- golden fingers.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
The physical dimension of the utility model difference video signal multiplexing card meets pci card specification, and board has 2
BNC socket is used as the single-ended PAL vision signals input of two-way, and there is board 1 DB25 socket to be used as 8 tunnel difference PAL vision signals
There is 1 parallel port socket to be used as the parallel port signal for receiving industrial computer for output and 1 tunnel difference PAL signals input, board；Board has
1 BNC socket is used as single-ended PAL vision signals output all the way.
Referring to Fig. 1, the utility model difference video signal multiplexing card includes video matrix switch circuit, video letter
Number change-over circuit, output self-detection circuit and the power supply circuit for power supply.Wherein, the video matrix switch circuit has
Video cross-point switch chip, its input receive outside 2 road PAL signals, and output end is connected with video signal conversion circuit.Can
To give 2 tunnel input signal any switching laws to 8 tunnel output signals.
The video signal conversion circuit includes three AD8146 wideband video differential drivers in parallel.Described three simultaneously
Single-ended PAL signals are converted to difference PAL signals, wherein two panels AD8146 broadbands by the AD8146 wideband videos differential driver of connection
Video differential driver carries out the conversion of 3 road signals respectively, the conversion of another 2 road signals of progress, form altogether 8 tunnels export to
DB25 connectors.
The output self-detection circuit includes the AD813 video amplifiers and BNC socket being connected with each other, and AD813 videos are put
Big device is connected with DB25 connectors, and through BNC socket external connection monitors.
The ICL7660 electricity that the power supply circuit has the golden finger of connection industrial computer PCI slot and is connected with golden finger
Source converter chip.+ 5V is converted to -5V by the ICL7660 power supply changeover devices chip.
Fig. 2 is shown in the use of board, and board is inserted to the PCI slot of industrial computer, and industry control is connected with a 25 core flat cables
The parallel port socket on parallel port and Video Quality Metric card in mainboard, access is all the way or the single-ended PAL video sources of two-way are (such as simulation shooting
Machine or flying-spot video generator).Switched by operating video matrix, you can by difference PAL vision signals from DB25 connections
Device exports.
The self-checking function of board is shown in Fig. 3, is connected to the single-ended PAL VTs of board with a coaxial cable
On one monitor, it is defeated that 8 tunnel output signals in DB25 connectors are shorted to difference PAL signals all the way respectively with 2 wires
Enter on pin, you can the signal quality of output signal is observed on a monitor, so as to realize the monitoring to quality of output signals.
Test of the utility model difference video signal multiplexing card for airborne video record device in summary, board
With the single-ended PAL video signal input interfaces of two-way, input signal is multiplexed with 8 road signals by switch matrix circuit, then passes through
Differential conversion circuit is converted to the output of difference PAL vision signals, and has self-checking function, can provide multichannel for video recorder
Difference PAL video signal sources.And the physical dimension of board meets pci card specification, the industry control with PCI slot may be inserted into
Computer processed uses, and is powered by PCI slot, passes through the parallel port output control video matrix switch of industrial computer, its structure design
Rationally, economy, reliable operation, easy to operate, can effectively meet the testing requirement of airborne video record device.
Claims (7)
- A kind of 1. difference video signal multiplexing card, it is characterised in that：Changed including video matrix switch circuit, vision signal Circuit, output self-detection circuit and the power supply circuit for power supply, wherein, the video matrix switch circuit has video friendship Crunode switch chip, its input receive outside 2 road PAL signals, and output end is connected with video signal conversion circuit, vision signal Change-over circuit output exports after connector, and the output self-detection circuit is connected with connector, and external connection monitors.
- 2. difference video signal multiplexing card according to claim 1, it is characterised in that：The video matrix switch electricity Road includes a piece of AD8108 video cross-point switch chip.
- 3. difference video signal multiplexing card according to claim 1, it is characterised in that：The vision signal conversion electricity Road includes three AD8146 wideband video differential drivers in parallel.
- 4. difference video signal multiplexing card according to claim 3, it is characterised in that：Described three in parallel Two panels AD8146 wideband videos differential driver carries out the conversion of 3 road signals respectively in AD8146 wideband video differential drivers, The conversion of another 2 road signals of progress.
- 5. difference video signal multiplexing card according to claim 1, it is characterised in that：The power supply circuit passes through gold Finger introduces power supply from the PCI slot of industrial computer, has ICL7660 power supply changeover device chips.
- 6. difference video signal multiplexing card according to claim 1, it is characterised in that：The output self-detection circuit The AD813 video amplifiers and BNC socket including interconnection.
- 7. difference video signal multiplexing card according to claim 1, it is characterised in that：The video cross-point switch Chip is connected by the parallel port of parallel port socket and industrial computer, and is controlled by it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621027471.2U CN206743423U (en) | 2016-08-31 | 2016-08-31 | A kind of difference video signal multiplexing card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621027471.2U CN206743423U (en) | 2016-08-31 | 2016-08-31 | A kind of difference video signal multiplexing card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206743423U true CN206743423U (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621027471.2U Active CN206743423U (en) | 2016-08-31 | 2016-08-31 | A kind of difference video signal multiplexing card |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566522A (en) * | 2018-03-28 | 2018-09-21 | 中国船舶重工集团公司第七0九研究所 | A kind of multi-channel video director system and method |
| CN112104811A (en) * | 2020-09-21 | 2020-12-18 | 中国科学院长春光学精密机械与物理研究所 | Low-latency multi-group imaging control system |
-
2016
- 2016-08-31 CN CN201621027471.2U patent/CN206743423U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566522A (en) * | 2018-03-28 | 2018-09-21 | 中国船舶重工集团公司第七0九研究所 | A kind of multi-channel video director system and method |
| CN112104811A (en) * | 2020-09-21 | 2020-12-18 | 中国科学院长春光学精密机械与物理研究所 | Low-latency multi-group imaging control system |
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