CN204615954U - A kind of extraction element of reverse control signal and video data acquiring equipment - Google Patents
A kind of extraction element of reverse control signal and video data acquiring equipment Download PDFInfo
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- CN204615954U CN204615954U CN201520363217.9U CN201520363217U CN204615954U CN 204615954 U CN204615954 U CN 204615954U CN 201520363217 U CN201520363217 U CN 201520363217U CN 204615954 U CN204615954 U CN 204615954U
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Abstract
The utility model discloses a kind of extraction element and video data acquiring equipment of reverse control signal, main contents comprise: extraction module obtains the voltage of the first node of the output of reverse control signal in described build-out resistor, and obtain the voltage of Section Point of input of reverse control signal in described build-out resistor, and when the voltage of the voltage of described first node determining to obtain not higher than described Section Point, extract the reverse control signal being in the blanking zone of video data, thus, ensure that the validity of the reverse control signal that video processing module receives, and, in this scenario, the reverse control signal that extraction module exports directly is pass-through to video processing module, without the need to through interface module and the parsing accepting interface module, thus, improve the transparent transmission speed of reverse control signal, avoid the delay caused due to the dissection process of interface module, improve the efficiency of Reverse Turning Control.
Description
Technical field
The utility model relates to communication technical field, particularly relates to a kind of extraction element and video data acquiring equipment of reverse control signal.
Background technology
At present on the market, there is a lot of analog video data interface, both can transmit forward video data on coaxial, reverse control signal can be transmitted on coaxial again.As shown in Figure 1, for the frame diagram of existing coaxial countercharge Video transmission system, this Video transmission system of coaxially countercharging comprises video camera 11 and video storaging equipment 12, after the vision signal collected is passed through process by video camera 11, video storaging equipment is sent to, in order to follow-up use by 75 ohm coaxial lines.Wherein, video camera 11 specifically comprises: video processing module 111, interface module 112, build-out resistor 113, comparator 114.Reverse control signal is all sent by the video storaging equipment 12 of rear end at the blanking zone of vision signal, now, because vision signal is in blanking zone (vision signal exported is low level), therefore, the signal amplitude on coaxial cable can be determined by reverse control signal.And traditional reverse control signal extracting mode is all directly the signal on coaxial cable and a fixed level VREF are made comparisons, extract reverse control signal, and it is sent to an interface module with digital analytical capabilities with the form of digital signal.
Still with reference to shown in figure 1, although reverse control signal extracting mode traditionally can extract reverse control signal during blanking zone, but, during due to non-blanking district transmission of video, the video voltage amplitude that interface module 112 exports is also likely high than the fixing comparative level VREF for extracting reverse control signal, so non-blanking district also can trigger comparator 114 output signal to interface module 112.Sent to the video processing module 111 of video camera with the form of reverse control signal by the signal that extracts by mistake in order to avoid non-blanking district, here interface module 112 has the function of the form identifying vision signal usually, from video protocols, all of non-blanking district are fallen by the signal shielding extracted by mistake.Because this processing mode needs to resolve video protocols, so after video processing module 111 can only wait for that interface module 112 has resolved video protocols, obtain by conventional management interface (can be generally I2C interface) the Reverse Turning Control information that interface module 112 resolves.
In sum, the extracting mode of this traditional reverse control signal can cause undoubtedly reverse control signal cannot in time receive by video processing module 111, cause countercharge effect to delay, reduce Consumer's Experience.
Utility model content
The utility model embodiment provides a kind of extraction element and video data acquiring equipment of reverse control signal, in order to solve exist in prior art need the reverse control signal to extracting to carry out video protocols parsing and cause sending to video processing module to process in time due to interface module, and then the problem that the effect that causes countercharging delays.
The utility model embodiment is by the following technical solutions:
A kind of extraction element of reverse control signal, be applied in the system being configured with coaxial countercharge interface, comprise: video processing module, build-out resistor and extraction module, described extraction module, for obtaining the voltage of the first node of the output of reverse control signal in described build-out resistor, and obtain the voltage of Section Point of input of reverse control signal in described build-out resistor, and when the voltage of the voltage of described first node determining to obtain not higher than described Section Point, extract the reverse control signal being in the blanking zone of video data;
Described video processing module, for receiving the reverse control signal that described extraction module extracts, and resolves described reverse control signal.
Preferably, described video processing module, specifically for carrying out the identification of signal format to the described reverse control signal received, and carries out the parsing of signal content.
Preferably, described extraction element also comprises: interface module, for receiving the video data of forward transmission, and is transferred to video storaging equipment by described build-out resistor.
Preferably, described extraction module is comparator.
A kind of video data acquiring equipment, comprises described reverse control signal extraction element.
In the utility model embodiment, change the extracting mode of reverse control signal completely, the basis of existing reverse control signal extraction element is improved, utilize existing build-out resistor, by carrying out differential comparison to the voltage at build-out resistor two ends, thus the signal transmission direction extracted on present cable, particularly, obtain the voltage of the first node of the output of reverse control signal in described build-out resistor, and obtain the voltage of Section Point of input of reverse control signal in described build-out resistor, and when the voltage of the voltage of described first node determining to obtain not higher than described Section Point, extract the reverse control signal being in the blanking zone of video data, thus, suppress false triggering during non-blanking district completely, ensure that the validity of the reverse control signal that video processing module receives, namely the reverse control signal extracted all is sent by video storaging equipment, and the vision signal that can not be transmitted by forward is as reverse control signal by mistake, and, in traditional reverse control signal extraction element, interface module is needed to resolve the reverse control signal that extraction module extracts and store, in this process, the control signal of digital signal can be encapsulated with the agreement that this interface module is corresponding, and store, then, be transferred to video processing module carry out the parsing of agreement and carry out the process of control signal, but, in this scenario, because the reverse control signal extracted is all effective, therefore, the reverse control signal that extraction module exports directly can be pass-through to video processing module, without the need to through interface module and the parsing accepting interface module, on the one hand, reduce the complexity of transmission process, on the other hand, achieve the real-time Transmission of effective reverse control signal, thus, improve the transparent transmission speed of reverse control signal, avoid the delay caused due to the dissection process of interface module, improve the efficiency of Reverse Turning Control.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the frame diagram of existing coaxial countercharge Video transmission system;
The structural representation of the extraction element of a kind of reverse control signal that Fig. 2 provides for the utility model embodiment;
The another kind of structural representation of the extraction element of the reverse control signal that Fig. 3 provides for the utility model embodiment;
The frame diagram of a kind of coaxial countercharge Video transmission system that Fig. 4 provides for the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Generally, reverse control signal extraction element involved by the utility model can be integrated in video data acquiring equipment, such as: the video acquisitions such as video camera, treatment facility, for the image/video of reality being converted to the video data signal of a physical form and transmitting.In addition, the required effective reverse control signal extracted in the utility model, be initiated by the video storaging equipment being positioned at video camera offside, the video data signal that this video storaging equipment sends over for receiving camera side, stores after resolving in digital form.Meanwhile, this video storaging equipment initiatively can also initiate reverse control signal, in order to carrying out standard switching to video camera, amplifies, the Reverse Turning Control such as to reduce.
Be described in detail the technical scheme involved by the utility model below by specific embodiment, the utility model includes, but are not limited to following examples.
As shown in Figure 2, the structural representation of the extraction element of a kind of reverse control signal provided for the utility model embodiment, the extraction element 2 of this reverse control signal is applied in the system being configured with coaxial countercharge interface, mainly comprises: video processing module 21, build-out resistor 22 and extraction module 23.
Wherein, video processing module 21 is for sending to video storaging equipment by the video data collected by build-out resistor 22.Extraction module 23 is for obtaining the voltage of the first node of the output of reverse control signal in build-out resistor 22, and obtain the voltage of Section Point of input of reverse control signal in build-out resistor 22, and when the voltage of the voltage of first node determining to obtain not higher than described Section Point, extract the reverse control signal being in the blanking zone of video data.Meanwhile, video processing module 21 also for receiving the reverse control signal that extraction module 23 extracts, and is resolved this reverse control signal.
By embodiment of the present utility model, change the extracting mode of reverse control signal, false triggering when suppressing non-blanking district completely and the reverse control signal that produces, ensure that all reverse control signals extracted are all useful signals, thus make video processing module directly can receive and process these reverse control signals, and the parsing of interface module to video protocols need not be waited for, improve the efficiency of coaxial countercharge greatly.
Preferably, video processing module 21, specifically for carrying out the identification of signal format to the reverse control signal received, and carries out the parsing of signal content.In the utility model embodiment, this reverse control signal realizes with 485 agreements usually, is the control signal for video camera that video data storage device is initiated, is specifically as follows and switches the video resolution of video camera, control the operations such as video camera rotation.
Preferably, as shown in Figure 3, the extraction element of this reverse control signal also comprises: interface module 24, for the video data of the forward transmission that receiver, video processing module 21 sends, and is transferred to video storaging equipment by described build-out resistor 22.
Preferably, in the utility model embodiment, involved extraction module can but be not limited to adopt comparator to carry out the extraction of reverse control signal.
In existing reverse control signal extraction element, corresponding reverse control signal (invalid) is extracted because non-blanking district also can trigger extraction module, thus, non-blanking district is caused to be sent to video processing module by the signal extracted by mistake with the form of invalid reverse control signal, therefore, in existing video data acquiring equipment, interface module can be increased identify with the form of the signal exported extraction module, then, video data processing module is sent to resolve the effective reverse control signal identified.But the parse operation that interface module is carried out can cause effective reverse control signal to be received by video processing module in time and to resolve, countercharge effect is caused to delay, infringement Consumer's Experience.For this reason, the utility model embodiment is on the basis of existing reverse control signal extraction element, the voltage of the first node of the output of reverse control signal in build-out resistor is obtained by extraction module, and the voltage of the Section Point of the input of reverse control signal in acquisition build-out resistor, and when the voltage of the voltage of first node determining to obtain not higher than Section Point, extract the reverse control signal being in the blanking zone of video data, thus, ensure that the validity of the reverse control signal that video processing module receives, namely the reverse control signal extracted all is sent by video storaging equipment, instead of the reverse control signal that the vision signal of the forward transmission of by mistake extracting produces, and, in this scenario, the signal that extraction module exports directly is pass-through to video processing module, without the need to through interface module and the parsing accepting interface module, thus, improve the transparent transmission speed of reverse control signal, avoid the delay caused due to the dissection process of interface module, improve the efficiency of Reverse Turning Control.
Below for video camera, the extraction element of combined circuit operation principle to the reverse control signal involved by the utility model is described in detail.
As shown in Figure 4, for the frame diagram of a kind of coaxial countercharge Video transmission system that the utility model embodiment provides, wherein, the extraction element 4 of reverse control signal is integrated in video camera C inside, is mainly used in the reverse control signal for video camera extracting video storaging equipment M initiation.In this extraction element 4, mainly comprise: video processing module 41, interface module 42, build-out resistor 43 and comparator 44.Wherein, the negative pole of comparator 44 connects the first node A1 being arranged in the output of build-out resistor 43 reverse control signal, and the positive pole of comparator 44 connects the Section Point A2 being arranged in the input of build-out resistor 43 reverse control signal.
In the utility model, build-out resistor 43 mainly possesses following two functions: one, ensures that video camera is consistent with the impedance of coaxial cable, realizes impedance matching; They are two years old, as sample resistance, when the voltage ratio Section Point A2 voltage height of first node A1 in this build-out resistor, represent that current cable signal is the video data signal transmitted to video storaging equipment forward by video camera, otherwise the voltage ratio Section Point A2 voltage of first node A1 is low, then represent that cable signal is the reverse control signal sent to video camera by video storaging equipment, and then just signal driving direction converts the pressure reduction that can identify to.Comparator 44, when the voltage of the first node A1 that the voltage of the Section Point A2 that its input anode connects connects higher than its input cathode, the output of comparator 44 exports high level; Otherwise, when voltage not higher than first node A1 of the voltage of Section Point A2, its output output low level.In the utility model, this comparator 44 is used to convert the pressure reduction recognized to high and low level, and exports, and is convenient to video processing module 41 and processes.
Particularly, the operation principle below in conjunction with non-blanking district, blanking zone describes in detail.
1, non-blanking district transmission
When video camera forward transmitting video data, namely video data is now in non-blanking district.Because video storaging equipment can not drive any type of signal in non-blanking district, therefore, no matter the signal voltage of video data is now high level or low level, in build-out resistor 43, the voltage of first node A1 is never lower than the voltage of Section Point A2, and then, the output of comparator 44 keeps output low level, and video processing module 41 low levelly not to affect by this, does not also process this.
2, blanking zone transmission
For blanking zone transmission, can be divided into two kinds of situations, one does not initiate Reverse Turning Control operation, namely the transmission of reverse control signal is not had, its principle is the same with non-blanking district, and comparator 44 output keeps output low level, and video processing module 41 does not have any response.Another kind initiates Reverse Turning Control operation, namely reverse control signal is initiated from video storaging equipment, when reverse control signal is high level, in build-out resistor 43, the voltage of first node A1 is lower than the voltage of Section Point A2, and the output of comparator 44 exports high level; When reverse control signal is low level, in build-out resistor 43, the voltage of first node A1 is higher than the voltage of Section Point A2, the output output low level of comparator 44.Thus utilize comparator 44 to be extracted by reverse control signal, the mistake avoiding the video data of forward transmission is extracted.And, the reverse control signal extracted due to comparator 44 is effective, therefore, the reverse control signal extracted directly is passed through the parsing that video processing module 41 carries out the video content of corresponding control signal by comparator 44, the operation of resolving video format need not be carried out via interface module 42, avoid the delay caused due to the dissection process of interface module 42, improve the efficiency of Reverse Turning Control.
To sum up, the utility model only has when video storaging equipment initiates countercharge operation in non-blanking district, just countercharge signal can be passed through video processing module, and not have the triggering of any signal any time at other, only low level output can be kept to video processing module.So just, the high and low reverse control signal that the direct response extraction of video processing module goes out can be made, and without the need to being concerned about current video protocol contents, by reverse control signal and forward transmission of video completely independent from hardware.
In like manner, the utility model embodiment still provides a kind of video data acquiring equipment, this video data acquiring equipment comprises any one reverse control signal extraction element mentioned in above-described embodiment, in addition, the modular unit of the functions such as the data sampling and processing that existing video data acquiring equipment possesses also is comprised.
The functional module mentioned in utility model is based on function, is not restricted to describe circuit in example, as long as its effect and function describes consistent, each functional module can with the specific chip meeting function, or hardware programmable device etc. is achieved.Such as: the utility model example realizes differential comparison with comparing thus extracts reverse control signal, this comparator also can realize with the amplifying circuit of specific multiplication factor, because the comparative effectiveness of comparator is equivalent to the amplifying circuit of an infinitely great multiplication factor in fact.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (5)
1. an extraction element for reverse control signal, is applied in the system being configured with coaxial countercharge interface, comprises: video processing module, build-out resistor and extraction module, is characterized in that,
Described extraction module, for obtaining the voltage of the first node of the output of reverse control signal in described build-out resistor, and obtain the voltage of Section Point of input of reverse control signal in described build-out resistor, and when the voltage of the voltage of described first node determining to obtain not higher than described Section Point, extract the reverse control signal being in the blanking zone of video data;
Described video processing module, for receiving the reverse control signal that described extraction module extracts, and resolves described reverse control signal.
2. extraction element as claimed in claim 1, is characterized in that, described video processing module, specifically for carrying out the identification of signal format to the described reverse control signal received, and carries out the parsing of signal content.
3. the extraction element as described in as arbitrary in claim 1 or 2, it is characterized in that, described extraction element also comprises:
Interface module, for receiving the video data of forward transmission, and is transferred to video storaging equipment by described build-out resistor.
4. extraction element as claimed in claim 3, it is characterized in that, described extraction module is comparator.
5. a video data acquiring equipment, is characterized in that, comprises the extraction element of the arbitrary described reverse control signal of claim 1-4.
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| CN201520363217.9U CN204615954U (en) | 2015-05-29 | 2015-05-29 | A kind of extraction element of reverse control signal and video data acquiring equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106303343A (en) * | 2015-05-29 | 2017-01-04 | 浙江大华技术股份有限公司 | The extraction element of a kind of reverse control signal and video data acquiring equipment |
| CN106657860A (en) * | 2016-12-23 | 2017-05-10 | 浙江大华技术股份有限公司 | Video extender, control method for video extender, and coaxial video control transmission device |
| EP3628122A4 (en) * | 2017-07-24 | 2020-05-06 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for signal distribution |
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2015
- 2015-05-29 CN CN201520363217.9U patent/CN204615954U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106303343A (en) * | 2015-05-29 | 2017-01-04 | 浙江大华技术股份有限公司 | The extraction element of a kind of reverse control signal and video data acquiring equipment |
| CN106657860A (en) * | 2016-12-23 | 2017-05-10 | 浙江大华技术股份有限公司 | Video extender, control method for video extender, and coaxial video control transmission device |
| WO2018113590A1 (en) * | 2016-12-23 | 2018-06-28 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
| CN106657860B (en) * | 2016-12-23 | 2019-09-17 | 浙江大华技术股份有限公司 | A kind of video extender, its control method and coaxial view control transmitting device |
| EP3542527A4 (en) * | 2016-12-23 | 2020-01-01 | Zhejiang Dahua Technology Co., Ltd | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
| US10827148B2 (en) | 2016-12-23 | 2020-11-03 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
| US11190730B2 (en) | 2016-12-23 | 2021-11-30 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
| EP3628122A4 (en) * | 2017-07-24 | 2020-05-06 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for signal distribution |
| US11115023B2 (en) | 2017-07-24 | 2021-09-07 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for signal distribution |
| US11750193B2 (en) | 2017-07-24 | 2023-09-05 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for signal distribution |
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