CN106303299A - A kind of video data allocation unit, equipment, system - Google Patents
A kind of video data allocation unit, equipment, system Download PDFInfo
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- CN106303299A CN106303299A CN201510292010.1A CN201510292010A CN106303299A CN 106303299 A CN106303299 A CN 106303299A CN 201510292010 A CN201510292010 A CN 201510292010A CN 106303299 A CN106303299 A CN 106303299A
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Abstract
nullThe invention discloses a kind of video data allocation unit、Equipment、System，Main contents are: video driving module receives video data，And by the first build-out resistor, video data forward is transferred to video data receiving apparatus，Video control module obtains the voltage of the primary nodal point being positioned at video data outfan in the first build-out resistor，And it is positioned at the voltage of the secondary nodal point of video data input，And when the voltage of primary nodal point is higher than the voltage of secondary nodal point，Extract the reverse control signal being in blanking zone，And the reverse control signal extracted is transferred in video data acquiring equipment，And utilize reverse control signal to trigger video to go to disturb module the voltage of two nodes of the first build-out resistor is controlled，So that the reverse control signal extracted does not returns，Ensure that the correct of reverse control signal is extracted and onwards transmission continuously.Also, it is not necessary to carry out digital-to-analogue conversion, it is to avoid quantizing distortion that digital processing brings and process the problem postponed.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of video data allocation unit, equipment, system.
Background technology
At present industry has an analog video interface of the coaxial countercharge function of a lot of band, such as: HDCVI, HDTVI,
AHD etc., and the principle of this kind of analog video interface, be that the blanking zone utilizing video data transmits instead
To control signal, thus the function that realizes coaxially countercharging.
Being based on this coaxial countercharge principle, the allotter for this type of analog video interface (can also claim
For distributing equipment), traditional solution is all to use digital processing mode, because countercharge signal is at blanking zone
In, so needing to go to resolve current video with processor, and find blanking zone, could be countercharge signal extraction
Out.
As shown in Fig. 1 (a), for the structural representation of conventional video distribution system, at this video distribution system
In, mainly include analog video camera 101, allotter 102 and multiple pseudo-terminal equipment 103.Work as forward
During control (forward video data transmission), allotter 102 is first with analog-digital converter (Analog-to-digital
Converter, ADC) complete the analog digital conversion of inputting video data, then processor is to supplied with digital signal
Copying, and be distributed to multiple output port, last each output port is restored by digital to analog converter
Inputting video data is also sent to corresponding pseudo-terminal equipment.And during Reverse Turning Control, as shown in Fig. 1 (b),
For the structural representation of traditional dispensers, this allotter includes ADC1021, DAC1022, processor 1023
And comparator 1024, it addition, also include build-out resistor R1.Processor 1023 first passes through parsing forward and regards
Frequency evidence, finds video blanking district, when finding that video data transmits blanking zone, can pass through comparator
Reverse control signal is extracted by 1024.Specifically, its principle is all can be with based on: reverse control signal
Be transmitted by a relatively large margin, and forward video data during blanking zone be all more by a small margin, as long as so with than
Relatively device, compares analog signal output and a fixed level VREF, can extract by a relatively large margin
Reverse control signal, the most again by extract countercharge signal with same principle, in the blanking zone period
In, then on the blanking zone of the video signal of the onwards transmission that is added to, send to video camera, thus realize distribution
The Reverse Turning Control function of device.
But, owing to, in above-mentioned traditional video distribution profiles, the extraction of reverse control signal is solid with one
Determine level to make comparisons, and forward video effective coverage level magnitudes is relevant with image intrinsic brilliance, so
Also it is possible to signal more higher than this fixed level occurs (in other words, it is simply that forward video effective coverage
Also the extraction of reverse control signal can be triggered).In prior art, in order to avoid effective coverage forward video institute
The reverse control signal triggered affects camera operation, needs to go whether to identify current video transmission with processor
It is in blanking zone, if not blanking zone, then ignores all of reverse control signal, can increase the most undoubtedly
Digital quantization and the process of digital processing, thus the quantizing distortion of priming signal and process postpone.
Summary of the invention
The embodiment of the present invention provides a kind of video distribution unit, equipment, system, in order to solve in prior art
The quantizing distortion existed and the problem processing delay.
The embodiment of the present invention is by the following technical solutions:
A kind of video data allocation unit, including: video driving module, the first build-out resistor, video control
Module, video go to disturb module, wherein,
Described video driving module, for receiving the video data that video data acquiring device transmission comes, and
By described first build-out resistor, video data forward is transferred to video data receiving apparatus；
Described video control module, is positioned at video data outfan for obtaining in described first build-out resistor
The voltage of primary nodal point, and obtain described first build-out resistor is positioned at the of described video data input
The voltage of two nodes, and determining that the voltage of described primary nodal point of acquisition is higher than the voltage of described secondary nodal point
Time, extract the reverse control signal of the blanking zone being in video data, and the reverse control signal that will extract
It is transferred in described video data acquiring equipment, and utilizes the described reverse control signal described video of triggering to go
Disturb module the voltage of two nodes of described first build-out resistor is controlled；
Described video goes to disturb module, at the reverse control signal extracted by described video control module
Triggering time, the voltage of described first two nodes of build-out resistor is controlled, so that extracts is anti-
Do not return to control signal.
Preferably, described video control module, specifically include:
Comparator, wherein, the positive pole of described comparator connects the primary nodal point of described first build-out resistor, negative
Pole connects the secondary nodal point of described first build-out resistor；
First N-type transistor, wherein, grid is connected with the output port of comparator by the 3rd node, leakage
Pole is connected with the first voltage, and source electrode is connected with described video data acquiring equipment by fourth node；
If described reverse control signal is driven to high level, the electricity of the primary nodal point of the most described first build-out resistor
Pressure is higher than the voltage of described secondary nodal point, the output port output high level signal of described comparator, this height electricity
Ordinary mail number triggers described first N-type transistor conducting so that described fourth node becomes high level, described instead
It is transferred to described video data acquiring equipment to the high level signal of control signal；
If described reverse control signal is driven to low level, the electricity of the primary nodal point of the most described first build-out resistor
The voltage of pressure not higher than described secondary nodal point, described comparator output low level signal, described first N-type is brilliant
Body pipe ends, and described fourth node keeps low level, and the low level signal of described reverse control signal is transferred to
Described video data acquiring equipment.
In embodiments of the present invention, by the comparator arranged, the positive pole of this comparator, negative pole are compared in real time
The voltage of the node connected, correctly to extract reverse control signal；And when comparator output HIGH voltage, the
One N-type transistor is opened, and sends reverse control signal to video data acquiring equipment.
Preferably, described video goes to disturb module, specifically includes:
Second N-type transistor, wherein, grid is connected with described 3rd node, drain electrode and described secondary nodal point
It is connected, source ground；
If described comparator output high level signal, the most described second N-type transistor conducting, described second section
Point remains low level, and the level of described secondary nodal point is not higher than the level of described primary nodal point so that
Described comparator can persistently extract reverse control signal, and the reverse control signal controlling to extract does not returns
Pass；
If described comparator output low level signal, the most described second N-type transistor cut-off, described Section four
Point is low level, and the most described secondary nodal point is also low level, and the level of described secondary nodal point is not less than described
The level of primary nodal point so that described comparator can persistently extract reverse control signal, and controls to extract
To reverse control signal do not return.
Preferably, described video driving module, specifically include: analog driver and the second build-out resistor；
Wherein, the input port of described analog driver is connected with fourth node, described analog driver defeated
Going out port to be connected with secondary nodal point by the second build-out resistor, described analog driver is for by regarding of receiving
The analogue signal drive amplification of frequency evidence.
Preferably, described transistor is metal-oxide-semiconductor.
A kind of video data distributing equipment, including at least one described video data allocation unit.
A kind of video data distribution system, including video data acquiring equipment, video data receiving apparatus, also
Including described video data distributing equipment, the 3rd build-out resistor；
Wherein, described video data distributing equipment, it is used for receiving video data, and video data forward is passed
It is defeated by video data receiving apparatus, and the blanking zone described video data receiving apparatus of reception at video data
The reverse control signal sent, extracts described reverse control signal, to self-contained first build-out resistor two
The voltage of individual node is controlled, so that the reverse control signal extracted does not returns.
One node ground connection of described 3rd build-out resistor, another node and described video data distributing equipment
Fourth node be connected.
The present invention uses pure hardware circuit to realize distribution and drives and the transparent transmission of reverse control signal, specifically,
This video distribution unit includes video driving module, the first build-out resistor, video control module, and video goes to disturb
Module, wherein, video driving module is used for receiving the video data that video data acquiring device transmission comes,
And by the first build-out resistor, video data forward is transferred to video data receiving apparatus；Video control module
For obtaining the voltage of the primary nodal point being positioned at video data outfan in described first build-out resistor, and obtain
Take the voltage of the secondary nodal point being positioned at described video data input in described first build-out resistor, and determining
When the voltage of the described primary nodal point obtained is higher than the voltage of described secondary nodal point, extracts and be in video data
The reverse control signal of blanking zone, and the reverse control signal extracted is transferred to described video data acquiring
In equipment, and the described reverse control signal described video of triggering is utilized to go to disturb module to described first coupling electricity
The voltage of two nodes of resistance is controlled, it is ensured that effective district of the video data of forward transmission will not trigger instead
To extraction and the onwards transmission of control signal；Video goes to disturb module for being carried by described video control module
During the triggering of reverse control signal taken out, the voltage of described first two nodes of build-out resistor is controlled
System, so that the reverse control signal extracted does not returns, meanwhile, utilizes the reverse control signal extracted
Suppression reverse control signal is re-driven and forms loop, and owing to reverse control signal is re-driven
And interrupt the transmission of normal reverse control signal, it is ensured that reverse control signal correct is extracted and forward continuously
Transmission.And, the solution of the present invention is not related to processor, thus, also avoid the need for carrying out digital-to-analogue conversion,
Therefore, it is to avoid quantizing distortion that digital processing brings and process the problem postponed.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, institute in embodiment being described below
The accompanying drawing used is needed to briefly introduce, it should be apparent that, the accompanying drawing in describing below is only the present invention's
Some embodiments, from the point of view of those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 (a) is the structural representation of conventional video distribution system；
Fig. 1 (b) is the structural representation of traditional dispensers；
The structural representation of a kind of video data allocation unit that Fig. 2 provides for the embodiment of the present invention one；
The structural representation of a kind of video data distributing equipment that Fig. 3 provides for the embodiment of the present invention two；
The structural representation of a kind of video data distribution system that Fig. 4 provides for the embodiment of the present invention three；
The circuit diagram of a kind of video data distribution system that Fig. 5 provides for the embodiment of the present invention four.
Detailed description of the invention
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this
Bright it is described in further detail, it is clear that described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under creative work premise, broadly fall into the scope of protection of the invention.
It is to make comparisons with a fixed level owing to existing reverse control signal extracts, and forward video data
The effectively level magnitudes in district is relevant with image intrinsic brilliance, is the most also possible to appearance than this fixing electricity
Flat higher signal (in other words, the effective district of forward video data also can trigger the extraction of reverse control signal).
The extraction operation of the reverse control signal triggered in order to avoid effective district of forward video data affects video
Data acquisition equipment normally works, and needs to go to identify whether the video data of current transmission is in processor and disappears
Hidden district, and be not blanking zone recognizing, then ignore all of reverse control signal, can increase the most undoubtedly
Digital quantization and the process of digital processing, thus the quantizing distortion of priming signal and process postpone.
Drive and the transparent transmission of reverse control signal to this end, the present invention uses pure hardware circuit to realize distribution, tool
Body ground, this video distribution unit includes video driving module, video control module, and video goes to disturb module, its
In, video driving module is for receiving the video data that video data acquiring device transmission comes, and by the
Video data forward is transferred to video data receiving apparatus by one build-out resistor；Video control module regards with described
Frequency drives two nodes of the first build-out resistor of module to be connected, and is used for obtaining position in described first build-out resistor
In the voltage of the primary nodal point of video data outfan, and obtain described first build-out resistor is positioned at described
The voltage of the secondary nodal point of video data input, and be higher than at the voltage of the described primary nodal point determining acquisition
During the voltage of described secondary nodal point, extract the reverse control signal of the blanking zone being in video data, and will carry
The reverse control signal got is transferred in described video data acquiring equipment, and utilizes described Reverse Turning Control
The signal described video of triggering goes to disturb module and is controlled the voltage of two nodes of described first build-out resistor,
Ensure that effective district of the video data of forward transmission will not trigger extraction and the onwards transmission of reverse control signal；
Video goes to disturb module for when triggering of the reverse control signal extracted by described video control module,
The voltage of described first two nodes of build-out resistor is controlled, the reverse control signal extracted with control
Do not return, meanwhile, utilize the reverse control signal extracted to suppress reverse control signal to be re-driven and shape
Become loop, it is ensured that the correct of reverse control signal is extracted and onwards transmission continuously.And, the solution of the present invention
In be not related to processor, thus, also avoid the need for carrying out digital-to-analogue conversion, therefore, it is to avoid digital processing band
The quantizing distortion come and the problem processing delay.
Being described in detail scheme involved in the present invention below by specific embodiment, the present invention includes
But it is not limited to following example.
Embodiment one:
In embodiments of the present invention, first introduce a kind of video data allocation unit 2, as in figure 2 it is shown, should
Video data allocation unit 2 includes that video driving module the 201, first build-out resistor 202, video control mould
Block 203, video go to disturb module 204:
Video driving module 201, for receiving the video data that video data acquiring device transmission comes, and
By the first build-out resistor 202, video data forward is transferred to video data receiving apparatus.
Video control module 203, be used for obtaining in described first build-out resistor 202 be positioned at video data output
The voltage of primary nodal point of end, and obtain that to be positioned at described video data in described first build-out resistor 202 defeated
Enter the voltage of secondary nodal point of end, and determining that the voltage of described primary nodal point of acquisition is higher than described second section
During the voltage put, extract the reverse control signal of the blanking zone being in video data, and reverse by extract
Control signal is transferred in described video data acquiring equipment, and utilizes described reverse control signal to trigger institute
State video to go to disturb module 204 voltage of two nodes of described first build-out resistor 202 is controlled.
Video goes to disturb module 204, at the Reverse Turning Control extracted by described video control module 203
During the triggering of signal, the voltage of described first 202 two nodes of build-out resistor is controlled, so that carrying
The reverse control signal got does not returns.
Thus so that the reverse control signal extracted is transferred in video data acquiring equipment, prevents from controlling
Signal return has influence on the normal transmission of reverse control signal.
Preferably, in embodiments of the present invention, described video control module, specifically include:
Comparator, wherein, the positive pole of described comparator connects the primary nodal point of described first build-out resistor, negative
Pole connects the secondary nodal point of described first build-out resistor；
First N-type transistor, wherein, grid is connected with the output port of comparator by the 3rd node, leakage
Pole is connected with the first voltage, and source electrode is connected with described video data acquiring equipment by fourth node；
If described reverse control signal is driven to high level, the electricity of the primary nodal point of the most described first build-out resistor
Pressure is higher than the voltage of described secondary nodal point, the output port output high level signal of described comparator, this height electricity
Ordinary mail number triggers described first N-type transistor conducting so that described fourth node becomes high level, described instead
It is transferred to described video data acquiring equipment to the high level signal of control signal；
If described reverse control signal is driven to low level, the electricity of the primary nodal point of the most described first build-out resistor
The voltage of pressure not higher than described secondary nodal point, described comparator output low level signal, described first N-type is brilliant
Body pipe ends, and described fourth node keeps low level, and the low level signal of described reverse control signal is transferred to
Described video data acquiring equipment.
Preferably, described video goes to disturb module, specifically includes:
Second N-type transistor, wherein, grid is connected with described 3rd node, drains and secondary nodal point phase
Even, source ground；
If described comparator output high level signal, the most described second N-type transistor conducting, described second section
Point remains low level, and the level of described secondary nodal point is not higher than the level of described primary nodal point so that
Described comparator can persistently extract reverse control signal, and the reverse control signal controlling to extract does not returns
Pass；
If described comparator output low level signal, the most described second N-type transistor cut-off, described Section four
Point is low level, and the most described secondary nodal point is also low level, and the level of described secondary nodal point is not less than described
The level of primary nodal point so that described comparator can persistently extract reverse control signal, and controls to extract
To reverse control signal do not return.
Preferably, described video driving module, specifically include: analog driver and the second build-out resistor；
Wherein, the input port of described analog driver is connected with fourth node, described analog driver defeated
Going out port to be connected with secondary nodal point by the second build-out resistor, described analog driver is for by regarding of receiving
The analogue signal drive amplification of frequency evidence.
Preferably, in embodiments of the present invention, involved N-type transistor can be N-type metal-oxide-semiconductor.
Embodiment two:
As it is shown on figure 3, for the embodiment of the present invention two provide a kind of video data distributing equipment 3, including to
A few video data allocation unit 2, in fact, the annexation of this video data distributing equipment 3 is with existing
Technology is similar to, and simply video data allocation unit 2 is different with prior art, above difference
Introduce, do not repeat at this.
Embodiment three:
As shown in Figure 4, a kind of video data distribution system 4 provided for the embodiment of the present invention, including: regard
Frequently data acquisition equipment 401, video data receiving apparatus 402, video data distributing equipment 403 and the 3rd
Build-out resistor R3.
Wherein, described video data distributing equipment 403, it is used for receiving video data, and by video data just
To being transferred to video data receiving apparatus, and the blanking zone reception described video data reception at video data
The reverse control signal that equipment 402 sends, extracts described reverse control signal, to self-contained first
The voltage of distribution two nodes of resistance is controlled, and does not returns with the reverse control signal controlling to extract.Thus,
Make to be transferred in described video data acquiring equipment 401 reverse control signal extracted.
One node ground connection of described 3rd build-out resistor R3, another node distributes with described video data
The fourth node of equipment 403 is connected.
Preferably, video data acquiring equipment 401 involved in the present invention can be the collecting devices such as video camera,
Video data receiving apparatus 402 can be that simulation receives the terminal units such as terminal.
Embodiment four:
In order to above-mentioned video data allocation unit, equipment and system are carried out the most detailed explanation, below
Explain in conjunction with concrete signal transmission rule.
As it is shown in figure 5, the circuit diagram of a kind of video data distribution system provided for the embodiment of the present invention four,
In the circuit, video data acquiring equipment 501 connects as video data acquiring equipment a video counts
According to distributing equipment 502 (present invention only as a example by connecting a video data distributing equipment, video data acquiring
Equipment 501 can also connect multiple video data distributing equipment 502), wherein, the distribution of this video data sets
A video data allocation unit is comprised in standby 502.This video data distributing equipment 502 connects has one to regard
Frequently data receiver 503.
Still as it is shown in figure 5, in the circuit diagram of this distribution system, video data acquiring equipment 501 is by the
Four node A4 connect video data distributing equipment 502, and one end of the 3rd build-out resistor R3 is connected to regard
Frequently between data acquisition equipment 501 and fourth node A4, the other end ground connection of the 3rd build-out resistor R3.
Wherein, the 3rd build-out resistor R3 typically could be arranged to 75 Ω, and its purpose existed is in order at video counts
Realizing impedance matching according between distributing equipment 502 and video data acquiring equipment 501, no matter video data is adopted
Collection equipment 501 connects how many roads video data distributing equipment 502, the most only arranges the 3rd build-out resistor.
Video data distributing equipment 502 includes video driving module 5021, video control module 5022, regards
Frequency goes to disturb module 5023.Wherein, the input port of the analog driver U1 in video driving module 5021
Input port as this video driving module 5021 is connected with fourth node A4, and analog driver U1 is even
Be connected to one end of the second build-out resistor R2, the other end of the second build-out resistor R2 by secondary nodal point A2 with
One end of first build-out resistor R1 connects, and the other end of the first build-out resistor R1 is by primary nodal point A1
Output port as this video driving module 5021 is connected with video data receiving apparatus 503.Wherein,
Video driving module 5021 exports for being driven by the video data received again, it is generally the case that need
Analog driver U1 is utilized to be amplified by the signal of video data, but, the present invention is not limited to the side amplified
Case, in example less demanding for transmission range, can be not provided with analog driver U1, will receive
Video data directly transmit.Additionally, in the case of the restriction not considering the conditions such as transmission range, this
The bright example also including reducing the signal of the video data received.
It should be noted that combine above-mentioned video data to drive module 5021, the first build-out resistor therein
R1 is requisite, in order to support that the function of follow-up comparator is to realize scheme proposed by the invention.
Second build-out resistor R2, can exist as the preferred scheme of one, be used for limiting size of current, it is ensured that
U1 can use normally.
Additionally, video control module 5022 includes comparator U2 and NMOS tube Q1, this comparator
The positive pole of U2 is connected at primary nodal point A1, and the negative pole of comparator U2 is connected at secondary nodal point A2,
The i.e. positive pole of this comparator and negative pole is respectively connecting to the two ends of the first build-out resistor R1, thus, work as video
Data forward transmits, and during reverse control signal reverse transfer, by primary nodal point A1 and secondary nodal point
The level of A2 determines the level height of the output port output of comparator, such as: as primary nodal point A1
Level higher than the level of secondary nodal point A2, then the signal of the positive pole input voltage of comparator U2 is more than negative
The signal of pole input voltage, this comparator U2 output port output high level；Otherwise, output low level,
Thus realize the function extracting reverse control signal of comparator U2.Wherein, the grid of NMOS tube Q1
Being connected by the output port of the 3rd node A3 and comparator U2, drain electrode is connected with the first voltage V1, source
Pole is connected with video data acquiring equipment 501 by fourth node A4, therefore, and this NMOS tube Q1D
Conducting and cut-off depend on the level height of output port output of comparator U2, if comparator U2
Output port output high level, then NMOS tube Q1 conducting, otherwise, then end.
It addition, the reverse control signal extracted in order to avoid video control module 5022 is back to video and drives
Dynamic model block 5021 is also extracted by video control module 5022 again, and the video data in the embodiment of the present invention divides
Arranging standby 502 and also include that video goes to disturb module 5023, specifically, this video goes to disturb module 5023 and includes
NMOS tube Q2, the grid of this NMOS tube Q2 and the 3rd node A3 are connected, and drain electrode is connected to second
Node A2, source ground, its principle is identical with NMOS tube Q1, does not repeats at this.
Specifically describe the circuit diagram of a video data distribution system above with Fig. 5, due to each structure it
Between dependency be not single structure accountable, need to combine concrete overall workflow and say
Bright.The most just by two instantiations, in conjunction with the work to above-mentioned modules of the circuit diagram shown in Fig. 5
Principle explains.
Example 1: the forward transmission of video data
When video data acquiring equipment 501 sends the video data of forward transmission to node A6, video counts
The amplifieroperation of signal is carried out according to being sent to analog driver U1 by fourth node A4, then through second
Build-out resistor R2 is transferred to secondary nodal point A2, is sent to primary nodal point through the first build-out resistor R1 afterwards
A1, and finally export to video data receiving apparatus 503.In this transmitting procedure, due to video data
Signal driving direction is by secondary nodal point A2 to primary nodal point A1, so the level of secondary nodal point A2 can height
It is higher than the level of positive pole in primary nodal point A1, the i.e. level of the negative pole of comparator U2, so comparator is defeated
Go out port output low level, and then, the 3rd node A3 is low level, then, NMOS tube Q2, NMOS
Pipe Q1 is off state, it may be assumed that video control module and video go to disturb module does not the most affect forward transmission
Video data.If in this example 1, video data acquiring equipment 501 connects has multi-path video data to distribute
Equipment and video data receiving apparatus, the distribution of the most adjacent two-way, output function are independently carried out, and can be formed respectively
Two do not interfere with each other and duplicate forward video signal.
Example 2: the reverse transfer of reverse control signal
Owing to coaxial countercharge principle is to produce at the blanking zone of video data, it is i.e. invalid when video data
During low level, video data receiving apparatus 503 initiating coaxially to countercharge, it exports reverse control signal (example
As: reverse 485 signals) arrive primary nodal point A1.
When reverse 485 signals are high level, the level of the primary nodal point A1 electricity higher than secondary nodal point A2
Flat, cause output port output high level, now NMOS tube Q2 and the NMOS tube of comparator U2
Q1 is both turned on.Owing to NMOS tube Q1 turns on, fourth node A4 is shorted to by NMOS tube Q1
First voltage, can be herein 3.3V (this first voltage can be configured according to actual circuit requirements,
This is not defined by the present invention), fourth node A4 also reforms into high level, thus, by reverse 485
The high level of signal has been transferred to video data acquiring equipment 501.
But, owing in fourth node A4 position, having two transmission branches, can be for transmission to video counts
According to collecting device 501, it is also possible to be transferred to video driving module, and then likely by comparator U2 again
Extract, thus Infinite Cyclic is gone down.Therefore, in order to ensure the high level quilt of reverse 485 signals extracted
Accurate delivery, can be in video control module 5022 and video driving module to video data acquiring equipment 501
Arranging video between 5021 to go to disturb module 5023, this video goes to disturb module and is specifically as follows a NMOS tube.
Now, due to NMOS tube Q2 turn on, secondary nodal point A2 by NMOS tube Q2 short circuit grounding, even if
The high level of reverse 485 signals before extracted is transferred to analog driver U1, no matter analog-driven
Device U1 output high level or low level, secondary nodal point A2 all remains low level (short circuit grounding), from
And, it is to avoid the high level of fourth node A4 is sent to secondary nodal point after analog driver U1 drives
A2, makes the level level more than or equal to primary nodal point A1 of secondary nodal point A2, causes comparator U2 defeated
Go out port output low level, affect the high level continuous transmission of reverse 485 signals.
When reverse 485 signals are low level, the level of primary nodal point A1 is less than or equal to secondary nodal point A2,
Comparator U2 output low level, NMOS tube Q2 and NMOS tube Q1 turn off, primary nodal point A1 mono-
Directly remaining the low level of blanking zone, the low level of the most reverse 485 signals has been transferred to video camera, and by
Turning off in NMOS tube Q2, the level of secondary nodal point A2 keeps original blanking zone low level, and i.e. second
The node A2 situation more than or equal to primary nodal point A1 keeps, it is ensured that the low level of reverse 485 signals is complete
Whole transmission.To sum up, the correct onwards transmission of reverse 485 signals is just achieved.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or knot
The form of the embodiment in terms of conjunction software and hardware.And, the present invention can use and wherein wrap one or more
Computer-usable storage medium containing computer usable program code (include but not limited to disk memory,
CD-ROM, optical memory etc.) form of the upper computer program implemented.
The present invention is with reference to method, equipment (system) and computer program product according to embodiments of the present invention
The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding
The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating
The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one
The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set
In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory
Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart
The function specified in flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, makes
Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices
Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one
The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted
Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. a video data allocation unit, it is characterised in that including: video driving module, first
Distribution resistance, video control module, video go to disturb module, wherein,
Described video driving module, for receiving the video data that video data acquiring device transmission comes, and
By described first build-out resistor, video data forward is transferred to video data receiving apparatus；
Described video control module, is positioned at video data outfan for obtaining in described first build-out resistor
The voltage of primary nodal point, and obtain described first build-out resistor is positioned at the of described video data input
The voltage of two nodes, and determining that the voltage of described primary nodal point of acquisition is higher than the voltage of described secondary nodal point
Time, extract the reverse control signal of the blanking zone being in video data, the reverse control signal extracted is passed
It is passed in described video data acquiring equipment, and utilizes the described reverse control signal described video of triggering to go to disturb
The voltage of two nodes of described first build-out resistor is controlled by module；
Described video goes to disturb module, at the reverse control signal extracted by described video control module
Triggering time, the voltage of described first two nodes of build-out resistor is controlled, so that extracts is anti-
Do not return to control signal.
2. video data allocation unit as claimed in claim 1, it is characterised in that described video controls
Module, specifically includes:
Comparator, wherein, the positive pole of described comparator connects the primary nodal point of described first build-out resistor, negative
Pole connects the secondary nodal point of described first build-out resistor；
First N-type transistor, wherein, grid is connected with the output port of comparator by the 3rd node, leakage
Pole is connected with the first voltage, and source electrode is connected with described video data acquiring equipment by fourth node；
If described reverse control signal is driven to high level, the electricity of the primary nodal point of the most described first build-out resistor
Pressure is higher than the voltage of described secondary nodal point, the output port output high level signal of described comparator, this height electricity
Ordinary mail number triggers described first N-type transistor conducting so that described fourth node becomes high level, described instead
It is transferred to described video data acquiring equipment to the high level signal of control signal；
If described reverse control signal is driven to low level, the electricity of the primary nodal point of the most described first build-out resistor
The voltage of pressure not higher than described secondary nodal point, described comparator output low level signal, described first N-type is brilliant
Body pipe ends, and described fourth node keeps low level, and the low level signal of described reverse control signal is transferred to
Described video data acquiring equipment.
3. video data allocation unit as claimed in claim 2, it is characterised in that described video goes to disturb
Module, specifically includes:
Second N-type transistor, wherein, grid is connected with described 3rd node, drain electrode and described secondary nodal point
It is connected, source ground；
If described comparator output high level signal, the most described second N-type transistor conducting, described second section
Point remains low level, and the level of described secondary nodal point is not higher than the level of described primary nodal point so that
Described comparator can persistently extract reverse control signal, and the reverse control signal controlling to extract does not returns
Pass；
If described comparator output low level signal, the most described second N-type transistor cut-off, described Section four
Point is low level, and the most described secondary nodal point is also low level, and the level of described secondary nodal point is not less than described
The level of primary nodal point so that described comparator can persistently extract reverse control signal, and controls to extract
To reverse control signal do not return.
4. video data allocation unit as claimed in claim 2 or claim 3, it is characterised in that described video
Drive module, specifically include: analog driver and the second build-out resistor；
Wherein, the input port of described analog driver is connected with fourth node, described analog driver defeated
Going out port to be connected with secondary nodal point by the second build-out resistor, described analog driver is for by regarding of receiving
The analogue signal drive amplification of frequency evidence.
5. video data allocation unit as claimed in claim 2 or claim 3, it is characterised in that described crystal
Pipe is metal-oxide-semiconductor.
6. a video data distributing equipment, it is characterised in that include that claim 1-5 is arbitrary described
At least one video data allocation unit.
7. a video data distribution system, including video data acquiring equipment, video data receiving apparatus,
It is characterized in that, also include the video data distributing equipment described in claim 6, the 3rd build-out resistor；
Wherein, described video data distributing equipment, it is used for receiving video data, and video data forward is passed
It is defeated by video data receiving apparatus, and the blanking zone described video data receiving apparatus of reception at video data
The reverse control signal sent, extracts described reverse control signal, to self-contained first build-out resistor two
The voltage of individual node is controlled, so that the reverse control signal extracted does not returns；
One node ground connection of described 3rd build-out resistor, another node and described video data distributing equipment
Fourth node be connected.
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| CN201510292010.1A CN106303299B (en) | 2015-05-29 | 2015-05-29 | Video data distribution unit, device and system |
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| CN201510292010.1A CN106303299B (en) | 2015-05-29 | 2015-05-29 | Video data distribution unit, device and system |
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| CN107483847A (en) * | 2017-07-24 | 2017-12-15 | 浙江大华技术股份有限公司 | A kind of video distributor |
| WO2018113590A1 (en) * | 2016-12-23 | 2018-06-28 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
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| CN106303299B (en) | 2020-04-03 |
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