CN102316312A - Video transmission method of building intercom system - Google Patents
Video transmission method of building intercom system Download PDFInfo
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- CN102316312A CN102316312A CN201110317950A CN201110317950A CN102316312A CN 102316312 A CN102316312 A CN 102316312A CN 201110317950 A CN201110317950 A CN 201110317950A CN 201110317950 A CN201110317950 A CN 201110317950A CN 102316312 A CN102316312 A CN 102316312A
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Abstract
The invention relates to a video transmission method of a building intercom system, which comprises a management center and a plurality of front terminals, wherein the management center and each front terminal are provided with video devices. The video transmission method of the building intercom system is characterized in that the video device of the management center and the video devices of the front terminals are connected in a twisted-pair bus structure, the management center and the front terminals are provided with video signal transmitting terminals and video signal receiving terminals, the video signal receiving terminals are provided with amplifying circuits and vide operation circuits, and at the video signal transmitting terminal, the vide operation circuit and a compensation circuit are adopted to amplify unbalanced video signals and compensate the frequency of the unbalanced video signals according to the cable loss; the compensation circuit comprises an automatic gain control circuit and an adaptive equalizing circuit; and after passing through the automatic gain control circuit, the video signals enter the adaptive equalizing circuit, and then, the video signals are output through the adaptive equalizing circuit.
Description
One, technical field
The present invention relates to the video transmission technologies in the building visual intercom system in the field of monitoring, particularly utilize twisted-pair feeder transportation simulator video, realize the video transmission method of the building conversational system of middle and long distance video intercom.
Two, background technology
Twisted-pair visual frequency is transmitted in the reason that the monitoring extensive applications mainly comes from two aspects: on the one hand; Solved the problem of high-quality image signal transmission in 200 meters to the 1000 meters distance ranges; Because coaxial cable is transmitted in and is difficult to reach requirement under the situation of not using amplifier in this segment distance scope, and use coaxial video amplifier or Optical Fiber Transmission to seem not too economical; On the other hand, solved the wiring problem of intensive monitor network, the wiring difficult problem the when size of twisted-pair feeder self and flexibility have overcome a large amount of use coaxial cable.
But twisted-pair feeder also exists bigger decay to signal, and the decay of vision signal is influenced by transmission range and signal frequency equally.If vision signal is directly transmitted in twisted-pair feeder, it is very big also can to decay, and can only transmit 50～60 meters.So vision signal will realize long-distance transmissions on twisted-pair feeder, must amplify and compensate.
And; The balance mode of twisted-pair line transmission video signal; What generally adopt at present is to utilize wire jumper to select different regulation stalls signal is carried out different amplifications and high frequency compensation according to the difference of transmission range at transmitting terminal; Receiving terminal also utilizes wire jumper to select different regulation stalls according to the difference of transmission range, so that signal is realized different amplification and compensation.This form is only applicable to man-to-man Star Network connected mode.
In building conversational system, terminal quantity is big, in order to practice thrift cable, obviously should not use the Star Network structure to realize transmitting one to one.
Three, summary of the invention
The objective of the invention is to overcome the shortcoming of transmitting one to one in the video transmission method of existing building conversational system; A kind of video transmission method of new building conversational system is proposed; This method can realize one-to-many and many-one transmission, can solve simultaneously because of different transmission range signal attenuations are different and amplify accordingly and the problem that compensates.
Basic ideas of the present invention are: introduce twisted-pair visual frequency transmission technology, AGC (automatic gain control) technology, the realization of AEQ (adaptive equalization) technology to different transmission ranges, the decay different video signals is carried out different amplifications and compensation automatically.And twisted-pair visual frequency transmission technology, AGC (automatic gain control) technology, AEQ (adaptive equalization) technology etc. are in itself, all are ripe prior aries.
In the present invention: because the strong anti-interference ability of twisted-pair feeder has benefited from the pattern of its balance transmission and cable multiple twin, thereby balanced mode is adopted in the twisted-pair visual frequency transmission.The basic principle of twisted-pair visual frequency transmission is at transmitting terminal non-equilibrium vision signal to be converted into the balance vision signal and through the twisted-pair feeder transmission, at receiving terminal, converts the balance vision signal into non-equilibrium vision signal; Because vision signal needs transmitted in both directions in the building conversational system; Be that vision signal both can be transmitted from administrative center toward front end; Vision signal also can be transmitted from front end toward administrative center, thereby requires administrative center and front end place that vision signal transmitting terminal and video reception end all will be set, thus; The vision signal transmitted in both directions is achieved in that when signal source is located in administrative center in the building conversational system; Signal is sent by the transmitting terminal of administrative center, and through the twisted-pair feeder transmission, the receiving terminal at the front end place by headend equipment receives; When signal source during at the front end place, signal is sent by the transmitting terminal of headend equipment, through the twisted-pair feeder transmission, is received by the receiving terminal of administrative center at the administrative center place; For saving installation cost, reduce the engineering construction difficulty, building conversational system adopts bus type structure to realize one-to-many or many-to-one transmission; Certainly exist vision signal under this structure and arrive different receiving terminals through different transmission ranges through same transmitting terminal; Be same administrative center to the process of different front ends, or the many places transmitting terminal arrives same receiving terminal through different transmission ranges, promptly different front ends are to the process of same administrative center; For realizing the image high-quality transmission; The reply signal amplifies and compensation by different transmission range signal attenuations differences accordingly, if adopt the way of traditional regulation stall, on engineering, is difficult to find suitable mode; Debug difficulties is very big, and engineering construction is inconvenience very.
The present invention solves the concrete technical scheme that its technical problem adopts: a kind of video transmission method of building conversational system, comprise an administrative center and a plurality of front end, and in administrative center and each front end video-unit is housed all, it is characterized in that:
Adopt the twisted-pair feeder bus type structure to be connected one-to-many transmission video signal between realization administrative center and all front ends between the video-unit of A, administrative center and the video-unit of all front ends;
B, in the video-unit of administrative center; Be provided with vision signal transmitting terminal and video reception end; In each front end; Also be provided with vision signal transmitting terminal and video reception end; The video reception end of corresponding each front end of the vision signal transmitting terminal of administrative center, the vision signal transmitting terminal of corresponding each front end of the video reception end of administrative center;
C, at the vision signal transmitting terminal, after being provided with amplifying circuit non-equilibrium vision signal being amplified, the non-equilibrium vision signal after adopting the video discharge circuit to amplify again converts the balance vision signal into;
D, at the video reception end, adopt the video discharge circuit to convert the balance vision signal into non-equilibrium vision signal after, non-equilibrium vision signal is amplified and frequency compensation accordingly according to the cable loss by compensating circuit;
E, compensating circuit are made up of automatic gain control circuit and Adpative equalizing circuit two parts, and vision signal is through behind the automatic gain control circuit, get into Adpative equalizing circuit again and export from Adpative equalizing circuit.
Further scheme is: automatic gain control circuit comprises adjustment circuit, video amplifier circuit, match circuit, automatic gain control detecting circuit, amplifying electric circuit with auto-gain-controlling function; Vision signal is through after adjusting circuit; Get into video amplifier circuit, get into Adpative equalizing circuit again through behind the match circuit then;
Also have one the tunnel to get into automatic gain control detecting circuit through the vision signal behind the match circuit, return video amplifier circuit through behind the amplifying electric circuit with auto-gain-controlling function again.
Scheme further is: Adpative equalizing circuit comprises equalizer, quantizes feedback comparator and adaptive controller, behind the vision signal process equalizer from automatic gain control circuit, exports behind the feedback comparator through quantizing again;
After also having one the tunnel to get into adaptive controller, vision signal behind the process quantification feedback comparator returns equalizer.
Scheme further is: equalizer is made up of FL-network.
In the present invention, said video-unit, amplifying circuit, video discharge circuit, adjustment circuit, video amplifier circuit, match circuit, automatic gain control detecting circuit, amplifying electric circuit with auto-gain-controlling function, equalizer, quantification feedback comparator and adaptive controller etc. can adopt existing circuit common or device.
Automatic gain control circuit is a kind of commonly used and typical peak value type control circuit, and it takes out the control voltage of synchronous head peak value as amplifier gain according to the maximum characteristics of synchronous head amplitude in the vision signal; Irrelevant with the images content, and can suppress to be mixed in the low-frequency disturbance in the vision signal, after the adjustment dividing potential drop, get into video amplifier circuit; Its AGC feedback loop is obtained vision signal from output; Through the detection rectification, make it to become the direct-current control voltage that the power with vision signal changes, the dc point of this Voltage Feedback control of video amplifier triode 2N5551; Thereby change its gain, reach the purpose of stable output.
By equalizer, quantize the Adpative equalizing circuit that feedback comparator and adaptive controller are formed; Wherein equalizer is the biquadratic filter network; Obtain burst signal; Relatively produce difference anti-phase frequency signal through quantizing a feedback comparator and a standard signal, concern the control signal that obtains being used to control filter unit, this signal and length of cable proportion relation by specific arithmetical operation through adaptive controller; Thereby realize the cable of different length is carried out the adaptive equalization compensation, the synchronizing signal of output is guaranteed at 293mV.
Advantage of the present invention and effect are: adopted bus type structure to realize one-to-many or many-to-one transmission; Introducing automatic gain control realizes the low frequency part of vision signal is amplified at receiving terminal; Adaptive equalization technique is realized the automatic compensation to the vision signal HFS; Need not to regulate, solved twisted-pair visual frequency transmission adjusting difficulty in traditional building talkback, what difficulty of construction was big denounces.
It is convenient that the present invention can make full use of the twisted-pair feeder wiring, the advantage of strong interference immunity; Can compensate automatically that different transmission ranges satisfy the building visual intercommunication requirement of large-scale community to the decay of vision signal in 1000 meters scopes; Can when guaranteeing the image high-quality transmission, reduce the project installation and commissioning difficulty greatly; Through equipment cascading, transmission range can expand 2000 meters to.
Four, description of drawings
Fig. 1 is existing star topology Network Video Transmission principle schematic.
Fig. 2 is a bus-type topological network video transmission principle schematic of the present invention.
Fig. 3 is a signal transmission sketch map in the building conversational system
Fig. 4 is a twisted-pair visual frequency transmission principle block diagram.
Fig. 5 is a receiving terminal compensating circuit theory diagram
Five, embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
Hub-and-spoke configuration shown in Figure 1 can only be realized one to one transmission, i.e. transmission video signal one to one between administrative center and each front end.
Like Fig. 2, Fig. 3, Fig. 4, Fig. 5, a kind of video transmission method of building conversational system comprises an administrative center and a plurality of front end, in administrative center and each front end video-unit is housed all, it is characterized in that:
Adopt the twisted-pair feeder bus type structure to be connected between the video-unit of A, administrative center and the video-unit of all front ends, and one-to-many transmission video signal between realization administrative center and all front ends;
B, in the video-unit of administrative center; Be provided with vision signal transmitting terminal and video reception end; In each front end; Also be provided with vision signal transmitting terminal and video reception end; The video reception end of corresponding each front end of the vision signal transmitting terminal of administrative center, the vision signal transmitting terminal of corresponding each front end of the video reception end of administrative center;
C, at the vision signal transmitting terminal, after being provided with amplifying circuit non-equilibrium vision signal being amplified, the non-equilibrium vision signal after adopting the video discharge circuit to amplify again converts the balance vision signal into;
D, at the video reception end, adopt the video discharge circuit to convert the balance vision signal into non-equilibrium vision signal after, non-equilibrium vision signal is amplified and frequency compensation accordingly according to the cable loss by compensating circuit.
E, compensating circuit are made up of automatic gain control circuit and Adpative equalizing circuit two parts, and vision signal is through behind the automatic gain control circuit, get into Adpative equalizing circuit again and export from Adpative equalizing circuit.
Automatic gain control circuit comprises adjustment circuit, video amplifier circuit, match circuit, automatic gain control detecting circuit, amplifying electric circuit with auto-gain-controlling function; Vision signal is through after adjusting circuit; Get into video amplifier circuit, get into Adpative equalizing circuit again through behind the match circuit then;
Also have one the tunnel to get into automatic gain control detecting circuit through the vision signal behind the match circuit, return video amplifier circuit through behind the amplifying electric circuit with auto-gain-controlling function again.
Adpative equalizing circuit comprises equalizer, quantizes feedback comparator and adaptive controller, behind the vision signal process equalizer from automatic gain control circuit, exports behind the feedback comparator through quantizing again;
After also having one the tunnel to get into adaptive controller, vision signal behind the process quantification feedback comparator returns equalizer.
Equalizer is made up of FL-network.
Wherein:
Bus type structure shown in Figure 2 has been realized one-to-many, and the many-one transmission realizes one-to-many transmission video signal between administrative center and all front ends.
As shown in Figure 3, the vision signal transmitted in both directions is achieved in that when signal source is located in administrative center in the building conversational system, and signal is sent by the transmitting terminal of administrative center, and through the twisted-pair feeder transmission, the receiving terminal at the front end place by headend equipment receives; When signal source during at the front end place, signal is sent by the transmitting terminal of headend equipment, through the twisted-pair feeder transmission, is received by the receiving terminal of administrative center at the administrative center place.
As shown in Figure 4, at transmitting terminal, amplifying circuit amplifies vision signal, and the non-equilibrium vision signal after will being amplified by the video discharge circuit converts the balance vision signal into, transmits with drive cable.At receiving terminal, convert the balance vision signal into non-equilibrium vision signal after, vision signal is amplified and frequency compensation according to the cable loss by compensating circuit.
Adopt the video discharge circuit at receiving terminal, realize balance and nonequilibrium conversion.
As shown in Figure 5, compensating circuit mainly is made up of automatic gain control circuit AGC and Adpative equalizing circuit AEQ two parts.Adopt automatic gain control circuit, based on cable transmission the low cut of vision signal is carried out difference and amplify, output is stablized within the specific limits.Adopt Adpative equalizing circuit, different high frequency compensations are carried out in the decay of different frequency vision signal according to cable transmission.
Automatic gain control circuit comprises adjustment circuit, video amplifier circuit, match circuit, automatic gain control detecting circuit, amplifying electric circuit with auto-gain-controlling function; Vision signal is through after adjusting circuit; Get into video amplifier circuit, get into Adpative equalizing circuit again through behind the match circuit then; Also have one the tunnel to get into automatic gain control detecting circuit through the vision signal behind the match circuit, return video amplifier circuit through behind the amplifying electric circuit with auto-gain-controlling function again.
Automatic gain control circuit is a closed loop amplitude feedback control system.This partial circuit is mainly revised the low frequency signal loss, and Gain Automatic adjusting can recover low frequency signal loss on the 1000 rice noodles cables, makes the output signal obtain 293mV nominal synchronizing signal.
Adpative equalizing circuit comprises equalizer, quantizes feedback comparator and adaptive controller, behind the vision signal process equalizer from automatic gain control circuit, exports behind the feedback comparator through quantizing again; After also having one the tunnel to get into adaptive controller, vision signal behind the process quantification feedback comparator returns equalizer.
The operation principle of Adpative equalizing circuit is: vision signal is carried out frequency compensation through the equalizer of being made up of FL-network; Balanced back signal compares by quantizing feedback comparator and pre-set criteria signal; The result is fed back to the adaptive controller unit; By means of an output that obtains and a given fiducial value and implement the balancing error that a kind of arithmetical operation draws and minimize; Through the working point parameter in the auto-adjusting circuit, and then control equalizer unit coefficient, thereby realize high-frequency signal adaptive equalization is controlled.
Claims (4)
1. the video transmission method of a building conversational system comprises an administrative center and a plurality of front end, in administrative center and each front end video-unit is housed all, it is characterized in that:
Adopt the twisted-pair feeder bus type structure to be connected one-to-many transmission video signal between realization administrative center and all front ends between the video-unit of A, administrative center and the video-unit of all front ends;
B, in the video-unit of administrative center; Be provided with vision signal transmitting terminal and video reception end; In each front end; Also be provided with vision signal transmitting terminal and video reception end; The video reception end of corresponding each front end of the vision signal transmitting terminal of administrative center, the vision signal transmitting terminal of corresponding each front end of the video reception end of administrative center;
C, at the vision signal transmitting terminal, after being provided with amplifying circuit non-equilibrium vision signal being amplified, adopt non-equilibrium change-over circuit again to balance, convert the non-equilibrium vision signal after amplifying into the balance vision signal;
D, at the video reception end, adopt the video discharge circuit to convert the balance vision signal into non-equilibrium vision signal after, non-equilibrium vision signal is amplified and frequency compensation accordingly according to the cable loss by compensating circuit;
E, compensating circuit are made up of automatic gain control circuit and Adpative equalizing circuit two parts, and vision signal is through behind the automatic gain control circuit, get into Adpative equalizing circuit again and export from Adpative equalizing circuit.
2. the video transmission method of building conversational system according to claim 1; It is characterized in that: automatic gain control circuit comprises adjustment circuit, video amplifier circuit, match circuit, automatic gain control detecting circuit, amplifying electric circuit with auto-gain-controlling function; Vision signal is through after adjusting circuit; Get into video amplifier circuit, get into Adpative equalizing circuit again through behind the match circuit then;
Also have one the tunnel to get into automatic gain control detecting circuit through the vision signal behind the match circuit, return video amplifier circuit through behind the amplifying electric circuit with auto-gain-controlling function again.
3. the video transmission method of building conversational system according to claim 1; It is characterized in that: Adpative equalizing circuit comprises equalizer, quantizes feedback comparator and adaptive controller; Behind the vision signal process equalizer from automatic gain control circuit, export behind the feedback comparator through quantizing again;
After also having one the tunnel to get into adaptive controller, vision signal behind the process quantification feedback comparator returns equalizer.
4. the video transmission method of building conversational system according to claim 3, it is characterized in that: equalizer is made up of FL-network.
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| CN201110317950A CN102316312A (en) | 2011-10-19 | 2011-10-19 | Video transmission method of building intercom system |
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| CN201110317950A CN102316312A (en) | 2011-10-19 | 2011-10-19 | Video transmission method of building intercom system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102821265A (en) * | 2012-08-09 | 2012-12-12 | 厦门狄耐克电子科技有限公司 | Video transmission method and building video doorphone system |
| CN104754292A (en) * | 2013-12-31 | 2015-07-01 | 浙江大华技术股份有限公司 | Method and device for determining parameters for compensation treatment of video signal |
| CN107517331A (en) * | 2016-06-17 | 2017-12-26 | 浙江大华技术股份有限公司 | A kind of automatic amplitude adjusting method and balanced device for cable transmission |
| CN108124137A (en) * | 2015-07-24 | 2018-06-05 | 金钱猫科技股份有限公司 | A kind of transmission of streams of video data system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102821265A (en) * | 2012-08-09 | 2012-12-12 | 厦门狄耐克电子科技有限公司 | Video transmission method and building video doorphone system |
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| CN108124137A (en) * | 2015-07-24 | 2018-06-05 | 金钱猫科技股份有限公司 | A kind of transmission of streams of video data system |
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| CN107517331A (en) * | 2016-06-17 | 2017-12-26 | 浙江大华技术股份有限公司 | A kind of automatic amplitude adjusting method and balanced device for cable transmission |
| CN107517331B (en) * | 2016-06-17 | 2019-12-24 | 浙江大华技术股份有限公司 | Automatic amplitude adjusting method and equalizer for cable transmission |
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Application publication date: 20120111 |