CN1210428A - Non-whole picture inhibiting TV monitoring system with bidirectional field counter code - Google Patents

Abstract

A television monitor system which is able to contrl part of an image frame and a bidirectional field retrace code feature that the address, control instruction, alarm and counting code are inserted during field retrace. The transmitter, repeater and receiver, which have the characteristics of resisting strong common-mode interference and wide ampletude-frequence correction, are used to allow one cable or UTP to transmit all information at very long distance. Use of DC recovery, directly coupled synchronous separation and suppressing part of an image field can make image switch without breaking and jump. The priority judgement and multifunction switch array can control multiple points without collision.

Description

Two-way field flyback sign indicating number also can suppress the TV monitor system of non-whole field image

The present invention is control method of relevant television system and products thereof, and it belongs to the system that inserts signal in the application television field at vertical blanking period.

Present closed-circuit TV monitoring system is concluded following several method:

Directly control: controlled device directly links to each other with operation keys, and the connecting line of this method is many, with the lengthening of distance, be subjected to the increase of controlled camera head number, the cost of wiring sharply rises, and gives and installs, maintenance brings great inconvenience, and reliability is also low, is not suitable for long distance and big system.

Transmit vision signal with a cable, transmit coded signal with a pair of line in addition: this comprises with the control of serial number character code, the binary code control of dual-tone multifrequency control and frequency division parallel convey (see " with the closed-circuit television system of couple of conductor control; " China Patent No. " 90106845.4) or the like, these all need special couple of conductor to come the transmission control code signal.When system was very big, the line between control room and controlled device still root was many, made mistakes easily, also was not easy to safeguard.During big system, how cabling has also brought many troubles to installation.In addition, they all do not comprise the propagation of reverse warning class sign indicating number, more do not have the treatment measures that multiple spot is reported to the police simultaneously, have mostly only comprised the control code of video camera end and do not comprise the transmission of multistage multidigit address code, and this just is difficult to constitute big system.

Control code is inserted transmission in the field flyback, and (United States Patent (USP): us4.714959 and Chinese patent: 91 21 4562.5): this method only transmits simultaneously by the video camera end with a cable or a pair of twisted-pair feeder and is sent to looking signal and being sent to the control code of the video camera and the auxiliary device thereof of video camera end by the control room of control room.They all do not have to transmit simultaneously multistage multidigit address code and to the processing instruction sign indicating number of alarm condition in field flyback, and the warning class sign indicating number that may exist and alarm count sign indicating number that has a plurality of alarm points simultaneously and the breaking alarming sign indicating number beamed back to the control room by the video camera end.Need not transmit under the situation of these information by other lead, they also are difficult for constituting big system.Even they do not relate to the reverse transfer problem of alarm code mini system yet.

Sign indicating number inserted mode as for United States Patent (USP) (us4714959) is that the information of several rows in the field flyback is turned off, and it is constant to adopt sample-and-hold circuit to keep turning off blanking level partly, insert the control code signal then betwixt, this except the circuit more complicated and, also will lose the lock-out pulse of several rows, destroyed the synchronous information integrity of TV, when the information code of inserting more for a long time, the lock-out pulse number that turn-offs is just more, just serious more to the successional destruction of lock-out pulse, therefore it has only inserted the few control code of figure place, and do not insert multistage, the multidigit address code, and to occurring the processing instruction sign indicating number of reporting to the police in many places simultaneously, and warning category information sign indicating number of beaming back to the control room direction by the video camera end and the alarm count sign indicating number when occurring a plurality of video camera end alarm code simultaneously etc., and these are that to constitute big system necessary.Therefore it can only be suitable for the mini system of control separately, and is unwell to the big system that has a plurality of control rooms to control simultaneously.Chinese patent (91214526.5) has also only inserted control code in field flyback, equally also only be suitable for the mini system in single control room, and do not possess the warning disposal ability.

What the sign indicating number inserted mode of United States Patent (USP) (us4714959) adopted is voltage addition pattern, not having sign indicating number adds fashionable with diode and vision signal isolation, diode current flow when adding coded signal, the low output impedance that this time code signal inserts circuit will influence the matching properties of transmission line, thereby cause reflection to wait harmful effect.

Chinese patent (91214562.5) adopts phase-locked loop manner that the synchronizing signal in all external vision signals is separated and removes to lock same synchronous generator again, this has all locked with same synchronous generator as all video signal sources on the surface, this synchronous generator is not a driving synchro in fact, and only be a driven synchronous motor, not the synchro system that locks other signal sources with its signal, but lock it oneself with the synchronizing information of other signal sources.And according to its given circuit, synchronizing separator circuit is (all being AC coupled between all synchronizing separator circuits of the prior art and incoming video signal) of AC coupled with being connected of vision signal.Because in video switch matrix, each vision signal is switched the amplitude between stylish vision signal and original video signal, average weight all is different, in ac-coupled circuit, to average out and need a transition course, so row of synchronizing separator circuit, output pulse be not promptly cut promptly existing, at signal the damaged row of information appearred between transfer period with these, field system chronizing impulse removes to lock driven synchronous motor, seizure and maintenance process that a locking is arranged again in locking process, locking phase during each the switching between last signal and back one signal all is at random, these factors all may make the image generation break and beat, owing to introduced extra link, in addition also poorer when switching at random.

In addition, except master-control room, also have a plurality of sub-control rooms in a big system, the same requirement can both be monitored each video camera in the whole system and auxiliary device thereof.Each video camera end comprises that some state informations of alarm signal also need in time feed back to master-control room and each sub-control room end, they also need insert in the field flyback in order to simplify transmission, a big system must have multistage, the multidigit address code, because system is very big, it is very big that the possibility of reporting to the police appears in a plurality of places simultaneously, how to handle these and occur the command code of reporting to the police simultaneously, and allow all these information codes and look signal and all transmit at same cable or in a pair of twisted-pair feeder, and the coded signal that send simultaneously in a plurality of control rooms can enter any the video camera end in the whole big system in good order under the situation of not competing and taking a risk, and this is that institute is unsolved in the prior art.

In addition, each video camera of TV monitor system is a side everywhere, and they are in asynchronous regime.As locking all video cameras as driving synchro with same synchronisation source, send to all video cameras to this synchronizing information makes it be in outer synchronous regime, can increase the complexity of whole monitoring system when adopting star to transmit, cost is risen, reliability decrease, when adopting chain to transmit, though the complexity of network can reduce, cost can descend, but the long refile meeting that continues descends quality of signals, and when chain link has a place to interrupt, will all be paralysed in all control points on this chain, reliability descends greatly, and this also is that supervisory control system institute is extremely undesirable.

Non-whole field image different because of the amplitude of each signal, average weight when switching with signal of breaking appear in asynchronous signal when switching, be present in synchronizing separator circuit, inevitable transition course in amplifying circuit and the various treatment circuit, the capable automatic frequency control circuit or the automatic phase control circuit of surveillance equipment, seizure in the field scan synchronous circuit, locking and synchronizing process all may make image produce jumping phenomena when signal switches.Solve the problem of breaking and beat of image in the TV monitor system as the method for economic and reliable how, this also is a still unsolved difficult problem in the existing system.

Prior art all divides amplifier to suppress common mode disturbances with voltage difference, and the limit of the anti-common mode disturbances ability of positive and negative both direction sum is forever less than its power supply voltage range.In order to improve the ability of its anti-common mode disturbances, must improve supply power voltage.In order to resist the common mode disturbances of positive and negative both direction, also handy sometimes positive and negative pressure power supply, this has increased the complexity and the power consumption of circuit undoubtedly, increased cost, reduced reliability, the ability of anti-common mode disturbances still can not get very big raising, and strong common mode disturbances still can't suppress.

The objective of the invention is to propose a kind of system, with the some kinds of methods of inventing for similar this system, reach circuit module of making by these methods and the integrated circuit of finally making thereof, but, can be combined into little with them to having only the big changeable TV monitor system of several camera heads to thousands of camera heads with the multiple product of unitization combination cordwood system type.They both can only use a cable, also can only use a pair of twisted-pair feeder to transmit signal, can not only in cable or twisted-pair feeder, transmit vision signal, but also can be identification code, multistage multidigit address code, the control code of video camera and auxiliary device thereof and in the insertion vision signal field flybacks such as processing instruction sign indicating number of warning category information (being designated hereinafter simply as normal field flyback sign indicating number), take out end transmission by each control room end to each descending subsystem and shooting with same cable or a pair of twisted-pair feeder, simultaneously can also be also being inserted in the field flyback from the alarm times count code and the breaking alarming sign indicating number (being designated hereinafter simply as counter field flyback sign indicating number) that occur simultaneously repeatedly reporting to the police in the various warning class sign indicating numbers of each video camera end and each the subordinate's subsystem, transmit along the direction opposite with normal field flyback sign indicating number, be loaded with vision signal simultaneously in such cable or a pair of twisted-pair feeder, normal field flyback sign indicating number and counter field flyback sign indicating number, so the instruction in each control room can be sent to subsystems at different levels and each video camera end in the system, and in the subsystems at different levels and each video camera bring out some existing information and also can send to each control room end.

Introduce m* (n+1) switch matrix, make master-control room and each sub-control room can freely select to have now in each the 1st subsystem input signal and observe, the while has also been opened up passage for each sub-control room enters in the total system arbitrary part.

In multi-functional m* (n+1) switch matrix, introduce the priority level arbiter, when making each control room need enter the 2nd grade and following subsystem at different levels, can according to priority not sort, make them under the situation of not competing and taking a risk, enter subsystems at different levels and each video camera end in good order.

Introduce transmitter, repeater and receiver and invest wherein shaping of coded signal gating and inserter again, vision signal is reached and its counter field flyback coded signal that transmits in the same way, amplitude fading that produces after long Distance Transmission and frequency distortion can both obtain relay step by step and proofread and correct, normal field flyback sign indicating number (opposite with the video transmission direction) is then by gating, shaping, again insert and obtain upgrading, thereby the extra long distance that can realize vision signal bi-directional code signal transmits.

The equal direct current in synchronous top of all incoming video signals of each returns to fixing same reference level in all video switch matrix that use in the system, direct coupled synchronization split circuit, mixed blanking forms circuit, field flyback is switched, in the inhibition that guarantees under the situation that former synchronizing signal transmits continuously the non-whole field picture intelligence, direct-coupled balance bypass type active leveling circuit, graphics monitor is capable, the formula of directly catching of field oscillator anti-interference is synchronous, directly the Embedded character of manifold type embeds circuit, the non-whole field image that breaks does not appear when image is switched, the jitterbug phenomenon that causes of the multiple transition course that does not cause because of switching yet.

Forward and reverse field flyback sign indicating number all adopts current mode to insert circuit, because its output impedance is very high, can not influence the impedance matching performance of transmission line, even and forward and reverse field flyback sign indicating number yet unlikely match condition that influences each other and influence transmission line when inserting simultaneously at same cable or with the two ends of a pair of twisted-pair feeder.

Adopt current differential amplifier to suppress common mode disturbances, it can only use single power supply, can both suppress to exceed several times (then can exceed tens of times for low frequency signal) in the common mode disturbances of its supply power voltage on positive and negative both direction.

But whole system is made up of the standard product of some unitization combinations, but may comprise the some different classes of module of the same unitization combination that proposes in the invention in each standard product again--the great majority of-these modules later on can integrated circuit.But the standardized product that utilizes these unitizations can be combined into big to the thousands of little extremely only TV monitor systems of several camera heads neatly.They both can also can be controlled by a plurality of control rooms that are distributed in different regions only by a control room control; They both can comprise long distance or extra long distance transmits necessary transmitter, repeater and receiver, also can only use in partially or completely no in them, long distance or short distance transmit.Some modules among the present invention not only are used for the various products of existing system, also can use in radio and television and other fields.

For the purpose of comprehensively, we will be illustrated by a big system, and mini system then can be simplified successively and got by big system.Below we do the description of a summary with reference to 1 pair of whole system of block diagram, and then each square frame is wherein done more detailed description.

Setting is distributed in n the control room that have of different regions, they all need and can monitor all video cameras and the auxiliary device thereof of whole system, they have separately keyboard 8 or computer 11, monitor 9 and video tape recorder 10, wherein there is one to be master-control room, it has the monitor 12 of a plurality of monitors 9, four minutes, nine minutes or 16 split screen, a plurality of video tape recorders 10 ... or the like.Suppose m the 1st grade of subsystem arranged in the whole system, m the 2nd grade of subsystem arranged again in each the 1st grade of subsystem, comprised m 3rd level subsystem again in each the 2nd grade of subsystem ... if the progression of subsystem is 3, and m=16, then the controllable camera head number of this system can reach 16 ³=4096, if progression is 4, then the controllable camera head number of this system is 16 ⁴=65536 ...

Because there be m the 1st grade of subsystem in this big system and n control room is arranged, can both observe the input signal of m the 1st grade of subsystem for making n control room, one m input must be arranged, the switch matrix of the m*n of n array output.Normal field flyback sign indicating number is sent by each control room, counter field flyback sign indicating number is then sent here by each control room in video camera end and each the subordinate's subsystem, the latter, the control room is not predicted, must be from the field flyback of each input signal they one do not detect with not leaking, this just need add an energy counter field flyback sign indicating number is carried out the touring fast switch arrays that detect in the m*n switch matrix, so be provided with the multifunction switch matrix 7 of a m* (n+1) in master-control room.

M input of m* (n+1) multifunction switch matrix can have the 1st grade subsystem of m to insert, and per the 1st grade of subsystem has the signal of m the 2nd grade of subsystem and insert, and below the rest may be inferred.Unless these some control rooms of subordinate's subsystem are only to this subsystem space control, and do not enter other subsystems in the whole system and outer, general enter certain the 1st grade of subsystem and following subordinate's subsystem thereof sometime a control room can only be arranged, therefore, only need a row video switch just enough, but for the touring counter field flyback sign indicating number that inserts in the field flyback that detects, still need increase touring detection of row and use switch matrix, m* (1+1) switch matrix 5 in Here it is the subsystems at different levels.Then can adopt as for those control rooms that enter some local subsystems and to be similar to m* (n+1) switch matrix but less p* (q+1) switch matrix of scale gets final product, just its effect is similar with m* (n+1) switch matrix, repeat no more herein, also do not draw in the block diagram.

M* (n+1) multifunction switch matrix 7 is provided in a side of the multifunction switch matrix of master-control room, and its n road output is then delivered to computer 11 or the keyboard 8 that comprises master-control room and each sub-control room, monitor 9 separately or video tape recorder 10 respectively by cable or twisted-pair feeder 29.

The m* of master-control room (n+1) multifunction switch matrix 7, and the distance between each sub-control room generally can be too not far away, if far, also need add partly or entirely proofreading and correct and upgrade in transmitter 6, repeater 3 and the receiver 4 etc. therebetween, these are not drawn among Fig. 1.

The several Control chamber can be by separately keyboard 8 or computer 11 in the row of normal field flyback sign indicating number by the rule insertion field flyback appointment of agreement, and be sent in m* (n+1) the multifunction switch matrix 7 of master-control room the output socket of switch arrays separately by transmission line 29.At this, corresponding code processor is selected normal field flyback sign indicating number in each array, and with the address code of the 1st grade of address code in the normal field flyback sign indicating number as this array, in order in the field flyback of original video signal, to switch new vision signal, meanwhile also by the preferential control selector in the multifunction switch matrix 7, the normal field flyback sign indicating number that a plurality of control rooms are sent simultaneously inserts in good order in the 1st grade of subsystem of appropriate address under not producing the condition of taking a risk and competing, and transmits to subordinate's subsystem and video camera end.

The synchronous top of all video input signals in m* (1+1) switch matrix 5 in m* (n+1) multifunction switch matrix 7 and the subsystem, all direct current returns to same reference level in each switch matrix, thereafter video field flyback is switched, separated in synchronization, mixed blanking forms, character forms, character inserts, the non-whole field picture intelligence suppresses and keeps synchronizing signal to transmit continuously, balance shunting active leveling circuit, the electric current insertion of coded signal, the amplification of coded signal, two-way cutting, gating ... or the like processing all directly carrying out under the couple state, they do not change the consistency of all signal Synchronization top level.

Because the preferential control selector in m* (n+1) the multifunction switch matrix 7 of Master Control Room, only allow all that at any time the normal field flyback sign indicating number that sends in a prepreerence control room of rank enters some subsystems, therefore in the switch matrix of each subsystem, need not to be provided with again preferential control selector, thereby only with regard to selecting, video only needed an array just, but exist owing to have counter field flyback sign indicating number, for it being gone the rounds detect and the count code that exists many places to report to the police is simultaneously held in each the subordinate's subsystem or the shooting that insert its input, reaching the instruction of sending by normal field flyback sign indicating number handles, also need row to be used for the touring switch matrix that detects, thereby the switch matrix of each subsystem is all unified is m* (1+1) switch matrix 5.

5 of m* (1+1) switch matrix 5 of m* (n+1) multifunction switch matrix 7 and 5 of first order m* (1+1) switch matrix and each subordinate's subsystem and adjacent higher level m* (n+1) switch matrix, look the length of transmission range, can directly link up with a cable or a pair of twisted-pair feeder 13 therebetween, also can be transmitter 6, partly or entirely their levels are linked up in repeater 3 and the receiver 4 by cable or twisted-pair feeder 13, in the hope of realizing vision signal and counter field flyback sign indicating number proofreaied and correct step by step, to reach long distance and extra long distance transmission and forward field flyback sign indicating number upgraded step by step.

Each input of the m* of minimum one-level (1+1) switch matrix then passes through cable or twisted-pair feeder 13 or when long distance, extra long distance transmission, the cable or the twisted-pair feeder 13 that reach therebetween by a pass device 6, repeater 3, receiver 4 link to each other with the control box 2 of video camera end.

In control box 2, translate the control code part in the normal field flyback sign indicating number on the one hand, remove to control video camera and auxiliary device 1 thereof, on the other hand the alarm code that may exist is inserted in the given nominated bank of counter field flyback sign indicating number taxonomically, start emergency set by the mode of agreement or the instruction in the normal field flyback sign indicating number that sends of control room in addition.

The input signal of the m of m* (n+1) multifunction switch matrix 7 the 1st grade of subsystem all passes through cable 28 and inserts the monitor 12 of many split screen for observation simultaneously, with the situation of each the 1st grade of subsystem of comprehensive observation.

The output signal of n array of m* (n+1) multifunction switch matrix 7---they are selected by n control room respectively, wherein each all divided two-way output, one the road delivers to keyboard 8, computer 11, monitor 9 and the video tape recorder 10 in the control room under this array, for observation, record or processing, and in those row of its field flyback agreement, inserting normal field flyback sign indicating number, the monitor 9 of respective array in the master-control room, video tape recorder 10 are then delivered in another road, and other auxiliary devices, for monitoring record and processing.

Fig. 2 has provided the block diagram and the emphasis oscillogram of direct coupled synchronization separation and mixed blanking formation circuit.Its characteristics are that synchronous top direct current returns to fixed level, composite video signal 205 be direct-current coupling to direct current amplifier 201---all existing synchronizing separator circuits all are AC coupled, and when all composite video signals 205 are sent to synchronizing separator circuit 201 in the video switch, it pushes up all on same level synchronously, the synchronizing signal preferential amplification of part (video signal portions may be limited) in 201 pairs of composite video signals 205 of direct-current coupling amplifier, and deliver in the two-way clipper circuit 202 and carry out double limiting, to remove some interference that synchronous top and synchronous root may exist, and obtain totally composite synchronizing signal 206 clearly, it is also delivered to vertical synchronization split circuit 203 and mixed blanking and forms in the circuit 204 except output is used for other places.

What vertical synchronization split circuit 203 was different with general circuit is, what its adopted is not general RC integrating circuit, but the switching mode integrating circuit.Its internal integral waveform is shown in oscillogram 207, and its isolated field synchronization waveform is shown in waveform 208.By oscillogram as seen, its pulse and serrated pulse are one to one, its timing accuracy is more than general vertical synchronization split circuit height, phenomenons such as unlikely generation is parallel, when R uses its first forward position, the pulse of back is inoperative, when pulse in the back may cause the place of misoperation, can sponge it with a monostable circuit.This vertical synchronization split circuit is good pulse width discriminator, under the situation of pre-and-post equalization pulse, also can isolate vertical sync pulse exactly, even vertical sync pulse is not when being a plurality of serrated pulses but an only broad pulse, also can separate exactly, when setting up new television system or in computer monitor, can simplify synchronous generator greatly and more accurate vertical synchronization stability is provided.

Mixed blanking forms circuit 204 and utilizes the composite synchronizing signal of input to form row, field blanking signal earlier, again with their mutually or and to composite blanking signal waveform 209, it is also exported line synchronizing signal 201 and horizontal blanking signal 211 and uses for other circuit in addition, the back all is well known, and does not draw in oscillogram.Yet only drawn in the oscillogram for simplicity waveform in the Phase Alternation Line system odd field, the waveform in the even field and the waveform of other standards similarly do not draw one by one.

By oscillogram as seen, the vertical blanking pulse in the composite blanking pulse be before initial pulse in the equilibrium as its starting point.And obtaining the due width of vertical blanking pulse with the method for counting door or monostable circuit, this is directly to regenerate from composite synchronizing pulse, the transition course that does not exist phase-locked loop or other modes to introduce.

Row disappear the formation of steady waveform except the high-frequency generator counting that can adopt row and catch and, can also adopt the same frequency oscillator of catching by horizontal pulse to realize, Fig. 3 is its basic circuit diagram and oscillogram, it both can be made up of separating component according to this principle, also can be made up of multiple integrated circuit.

Line synchronizing signal 210 is to remove the clean line frequency pulse that 2 times of line frequency compositions obtain with being present in the external interference pulse in the active line with monostable time-delay, has guaranteed the stability and the reliability of line frequency.

Fig. 3 is schematic illustration figure and the corresponding oscillogram thereof that horizontal blanking forms circuit.Circuit 301 can be made of separating component, also can be integrated circuit, and it has a variety of composition proposals, and this is a multivibrator that charging separately and discharge RC loop are arranged.Wherein 305 is charging resistor, and 306 is discharge resistance, and 307 is charge and discharge capacitance, and waveform 303 is oscillograms of 303 in circuit.In this circuit, choose charging resistor 305 much smaller than discharge resistance 306, make when horizontal synchronizing pulse 302 does not arrive, electronic switch 308 open circuits, oscillator 301 is in the self-excitation state, and its waveform is shown in waveform 303 left ends.

One when horizontal synchronizing pulse 302 arrives, electronic switch 302 is connected, this moment oscillator be in which kind of state all military order electric capacity 307 discharge into fixed voltage, all the time catch in this current potential at lock-out pulse 302 duration of existences, after lock-out pulse 302 is pass by, oscillator i.e. fixed level starting oscillation thus, so this method of synchronization, one is synchronous immediately when lock-out pulse arrives, as synclator or automatic frequency control, the automatic phase control generator has a synchronous or catch lock process like that anything but.And as long as suitably select to discharge and recharge time constant, lock-out pulse is dropped in the zone that the state wraparound does not take place, the counter-rotating of oscillator can be adjusted arbitrarily along the position like this, its leading amount that is ahead of the lock-out pulse forward position can be regulated arbitrarily in very wide scope from 0, so obtain the horizontal blanking impulse that not only produces leading edge but also the broad width is arranged with it at one stroke from horizontal synchronizing pulse, this be the existing method of synchronization can not realize.

In addition, from oscillogram we as can be seen, the synclator of this mode, its self-oscillation period ratio is also short synchronizing cycle, this also is what general synclator institute can not realization.Just the opposite, their self-oscillation cycle is all long than synchronizing cycle.

The synchronizing characteristics immediately of sort circuit can obtain the characteristic of leading horizontal synchronizing pulse forward position pulse edge and natural vibration period than synchronizing cycle short characteristic and synchronous reliability thereof, makes it all can obtain purposes widely in many occasions in future.For example, except being used in direct generation blanking pulse, can be used as television receiver, row in monitor and the computer display, vertical oscillator, synchronizing separator circuit and switch integral form field synchronization split circuit that the inhibition active line that it is mentioned in the present invention is disturbed, the automatic frequency control and the automatic phase control circuit that can replace existing line oscillator with the synchronous method of the formula of directly catching, and the existing method of synchronization of field oscillator, make lock-out pulse once synchronization line immediately occurring, field oscillator, and its natural vibration period is shorter than synchronizing cycle, like this when no signal, OK, field oscillator will work in the short cycle, thereby the amplitude of row-field scanning reduces, power consumption also reduces, and can never damage row because of asynchronous excessive cycle, the situation of field scan output stage.The accuracy on field system chronizing impulse edge has been eliminated parallel phenomenon fully, makes interlacing effect strange, the idol field reach very satisfied degree.

Its synchronously and stable to catch characteristic also be unique at the synchronization aspects that is used for high frequency multiplication oscillator immediately, it can make the oscillator of any overtones band be locked by it.

Fig. 4 has provided the block diagram that normal field flyback sign indicating number inserts, and corresponding oscillogram.Below we are illustrated in conjunction with block diagram and oscillogram:

Select the vision signal 431 obtain through video switch, deliver to direct coupled synchronization split circuit 401, (identical by its isolated field system chronizing impulse 433 with waveform 208, do not draw herein) and composite synchronizing pulse 420 all deliver to the counting delay circuit 403, by the back edge of the delay pulse of its generation that is the forward position of waveform 422, just in time drop on the sintering of odd field the 7th row, this has all escaped post-equalizing pulse to all television systems in the world, and enter in the full line district, for Phase Alternation Line system, just in time the 320th row during its even field, it is sent to normal field flyback sign indicating number and forms this gate circuit of gate count 404 deactivations, makes it count and form the gate pulse 422 of specifying line number to composite synchronizing pulse 420.

Composite synchronizing pulse 420 is also delivered to horizontal blanking impulse and is formed circuit 402, forms horizontal blanking impulse waveform 421 at this; Composite synchronizing pulse 420 is also delivered to and is caught formula multi-frequency generator 405, make this multi-frequency generator and horizontal synchronizing pulse strict synchronism, and producing waveform 423, it is the clock pulse of normal field flyback sign indicating number code signal, the clock pulse of the counter field flyback sign indicating number decoded signal that will speak of after also being.

Composite sync waveform 420, gate pulse 422 and controlled clock oscillating impulse 423 all send into the index pulse storbing gate and the clock pulse storbing gate forms in the circuit 406, forms index pulse storbing gate pulse 432 and clock storbing gate 424,425 at this.Real clock pulse 426 is selected from waveform 423 in gate pulse 424 and 425 phases or back.

Index pulse storbing gate 432 and horizontal blanking impulse 421 are all sent into index pulse and are formed circuit 407.Select the index pulse 429 that is arranged in the 7th row and the 320th row (for Phase Alternation Line system) at this.

In the square frame 408 multistage by in the normal field flyback sign indicating number of computer or keyboard input of latching, the control code of multidigit address code, video camera and auxiliary device thereof reaches the parallel output code to the processing instruction sign indicating number of warning class sign indicating number, they are transported in groups also, go here and there in the field flyback sign indicating number inserter 409, and clock pulse 426 is also delivered in 409.Back edge with clock pulse 426 becomes a non-return-to-zero serial code 427 of inserting the field flyback formula as clock along a parallel sign indicating number, and waveform 427 obtains inserting the coded signal 428 of blanking behind horizontal blanking impulse 421 gatings.

Identification code 429 and coded signal 428 synthesize coded signal 430 in coded signal combiner circuit 410, Here it is complete normal field flyback sign indicating number, it is by the identification code of initial row, following closely the 2nd, the secondary 4 bit address sign indicating numbers of the 3rd row, (be purposes of simplicity of explanation, 2 grades have only been drawn here, 4 every grade address code, under the actual conditions, this progression and figure place all are variable, this agreement by system decides) 4 video cameras of the 4th row and the control command sign indicating number of auxiliary device thereof, (this comprises 24=16 control command, and in fact the figure place of this instruction neither be unalterable), 4 warning class Signal Processing command codes of the 5th row.

Normal field flyback sign indicating number 430 is inserted into by current mode sign indicating number inserter 411 in the vision signal of input and goes, thereby obtains having inserted in the nominated bank in the vision signal field flyback composite video signal 431 of normal field flyback sign indicating number.

The purpose that adopts current mode to insert is that it has very high output impedance, no matter whether it is in insert or non-insertion state, or even forward and reverse field flyback sign indicating number is at the two ends of same transmission lines, when two-way simultaneous inserts, can not produce bad parallel effect to build-out resistor, thereby can not make cable or twisted-pair feeder transmission etc. lose coupling and generation reflex, this has overcome inherent shortcoming of the prior art.Electric current is inserted with multiple circuit inserted mode, the single power supply formula is arranged, the dual power supply formula, balanced type, uneven formula, they respectively have output of recommending and the non-output type of recommending again, have introduction in my other patent.

Counter field flyback sign indicating number is by the alarm triage sign indicating number, breaking alarming sign indicating number, the multidigit compositions such as count code of class sign indicating number that occur simultaneously reporting to the police in the switch matrix at different levels.The insertion circuit block diagram oscillogram 4 of the block diagram of its insertion circuit and oscillogram and normal field flyback sign indicating number is similar.Its difference only is that including of sign indicating number definition is different; In each row after following normal field flyback sign indicating number closely of the position that sign indicating number inserts; Counter field flyback sign indicating number transmits along the same direction of vision signal, and the insertion of its yard both can also can also be carried out at the output of this control box in the video camera control box at signal input part for the video camera end.When fashionable in the box interpolation, do not relate to the transmission line impedance matching problem, both can insert circuit by the working voltage type, also can use current mode to insert circuit; Occur the count code of repeatedly reporting to the police when in each switch matrix, inserting, then both can in the treatment circuit of each switch matrix inside, insert, also can insert at the output of each switch matrix for need.

The insertion process of all yards during except employing electric current inserted mode, all is the direct-current coupling formula, can not introduce transition course and low frequency and intermediate frequency distortion.

Normal field flyback sign indicating number is descending transmission, and its address code and warning processing instruction sign indicating number will be deciphered in each switch matrix, and control code will be deciphered in the video camera control box.

Counter field flyback sign indicating number is up transmission, its warning class sign indicating number, breaking alarming sign indicating number and the count code that occurs multiple alarm simultaneously will go the rounds to detect in each switch matrix, and in each control room, decipher, send sound and light alarm and take emergency measures, and send the warning processing instruction and transmit to subordinate.

If forward and reverse field flyback sign indicating number no matter its definition separately how, all insert with figure place identical in every row (4 shown in oscillogram for example), the decoder of the encoder of normal field flyback sign indicating number and counter field flyback sign indicating number then, available same group of circuit in each control room, same clock source, the coding of same counter field flyback sign indicating number and decoder also available same group of circuit in each switch matrix and video camera control box of normal field flyback sign indicating number, same clock source, just the different clocks that utilized with codec in position chosen of clock door are along different, because the live part of clock is a symmetrical square wave, its trailing edge just is being used as, during the encoded clock of counter field flyback sign indicating number NRZ, its rising edge is as the clock edge of decoder, then just in time drop on the centre of the every bit code of non-return-to-zero coding signal, except when decoding takes out digitlization shaping again to coded signal and eliminates the interference, clock pulse is placed in the middle, also eliminate the interference in transmission course, introduced at the sign indicating number edge and the influence of distortion, improved the accuracy of decoding.

Fig. 5 is strobe pulse formation circuit block diagram and the corresponding oscillogram thereof that relevant non-whole field picture intelligence suppresses and keep the continuous transmission of synchronizing information.

Block diagram 501 is to switch the edge identification circuit, when each switch matrix switches at random, it can obtain an edge pulse 502, it is delivered to rest-set flip-flop 502 and makes its set as the trigger impulse of its set arm, field system chronizing impulse 521 immediately following vision signal before the switching thereafter makes it reset, and gets waveform 522, meanwhile, video switch is on the back edge of this field system chronizing impulse arrival moment that is waveform 522, and the field flyback of carrying out vision signal by new address is switched.The vision signal of new incision and original video signal are because of non-same synchronisation source, relation between field synchronization is at random, its field system chronizing impulse interbody spacer is a non-whole field, this the image that breaks can occur, for this reason we (it is produced by same direct coupled synchronization split circuit waveform 522 and lock-out pulse 523, therefore the signal source of input has become the time, so its phase relation is with original different) be added to another rest-set flip-flop door formation circuit 503, at this, set pulse is made on back edge with waveform 522, count the carry pulse of back generation as reset pulse with the field system chronizing impulse of first arrival or to field system chronizing impulse, thereby obtain waveform 524 or 525, the former is used in and adopts direct coupled synchronization split circuit provided by the present invention and catch the formula row, in the televimonitor system of field oscillator, the latter is used in the system that adopts general televimonitor.

Waveform 524 or 525 and composite blanking pulse 526 (do not draw herein, it is consistent with waveform 209), all deliver in the gated circuit 504, select non-whole field by storbing gate pulse 524 or 525 or comprise non-whole field at this interior some composite blanking pulse 527 (this is well-known waveform, does not draw among the figure).With this local composite blanking pulse, the picture intelligence of the trace of disinthibiting and allow the composite sync of flyback and burst signal in the same old way transmit by original situation, with allow the outer all videos signal of storbing gate transmit in the same old way, these processes all are to carry out under the situation of direct-current coupling, they except not changing stick signal itself, do not change their DC level, their synchronous top all on same level, can not produce jitterbug and visual fracture phenomena all the time yet.

When long distance or extra long distance transmit, need add transmitter, repeater and receiver etc. to vision signal in the transmission way of signal, forward and reverse field flyback coded signal is proofreaied and correct and is upgraded; Vision signal and counter field flyback coded signal, can proofread and correct simultaneously by the video channel in transmitter, repeater and the receiver because of its direction is identical, part in this part first three items patent referring to me (94108029.3,95115443.5 and 96120626.8) is discussed.Normal field flyback sign indicating number is grown the relay of distance and is proofreaied and correct, the present invention partly takes out the normal field flyback sign indicating number that transmitter, repeater and receiver VT are inserted in the field flyback, again insert the video signal input terminal of transmitter, repeater and receiver after the shaping again, to guarantee the renewal step by step and the transmission continuity of its waveform, its block diagram and oscillogram are as shown in Figure 6.

The vision signal among Fig. 6 in square frame 606 expression transmitter, repeater and the receivers and the correction and the amplifier section of counter field flyback sign indicating number.Its signal output waveform of having proofreaied and correct 620 is exported toward higher level's subsystem direction transmits except that one the tunnel, and two-way is then delivered to direct coupled synchronization split circuit 601 and direct coupled amplifier and amplitude limiter 602 respectively in addition.The internal circuit of square frame 601 is the same with aforesaid Fig. 2 principle, and it isolates composite sync and field system chronizing impulse, delivers to normal field flyback storbing gate and forms circuit square frame 603, forms the storbing gate pulse of the normal field flyback sign indicating number shown in waveform 621 at this.Video signal portions in 603 pairs of outputting video signals of having proofreaied and correct of direct-current coupling amplification and double limiting square frame is preferentially amplified, and double limiting, make video and all coded signal all by double limiting, thereby coded signal is reshaped into the digital signal level of having removed interference and frequency and amplitude distortion, 604 of gated circuits are selected normal field flyback coded signal 622 with storbing gate pulse 621 from what square frame 602 was sent here the signal of double limiting, and be sent to current mode field flyback sign indicating number inserter 605, by the pattern that square frame 605 inserts with current mode normal field flyback sign indicating number is inserted transmitter, repeater and receiver look signal input part, it is transmitted to the opposite direction of vision signal.Transmit for imbalance, its inserted mode also is unbalanced.Transmitting inserted mode for balance also correspondingly is balance.But they all are current mode insertion circuit, self have very high output impedance, thereby whether it insert the impedance matching property that does not influence the input/output terminal transmission cable.

Transmitter, in the correction of repeater and receiver and the amplifier section square frame 606, include the imported differential amplifier of electric current that can resist strong common mode disturbances, gain changes the direct current input, the multistage ring of direct-current coupling formula of output services point is outer high, the intermediate frequency compensated amplifier, the continuously adjustable height of stepping, the intermediate frequency compensating network, the curtage type exciting amplifier of balance or uneven output, the renewal inserter of current mode coded signal, they can resist the common mode disturbances that is several times as much as single power supply voltage (be equivalent to number decuple signal voltages) on positive and negative both direction, proofread and correct and do not introduce low-frequency distortion, the outer high intermediate frequency compensation of ring is difficult for producing parasitic oscillation, can obtain the more height of wide region, the step-type Continuous Compensation of intermediate frequency, be applicable to the different length line, the continuous correction of cable transmission.The detailed description of this part circuit is please referring to my in addition three invention: 94108029.3-3,95115443.5-3, the part explanation in 96120626.8, this not with give unnecessary details.

The imported differential amplifier of electric current, the ability of the anti-common mode disturbances of its brilliance not only has been widely used in video field, also has been widely used in low frequency and digital circuit.When being used in low-frequency range, the ability of its two-way anti-common mode disturbances can rise to tens of times of its supply power voltage (signal voltages hundreds of times), and this extracts useful weak signal in strong common mode disturbances be very useful.If the back at this current mode differential input stage connects digital processing circuit, the characteristic of remarkable anti-common mode disturbances can make the reliable more and longer distance of transmission in internet of computer as the interface circuit of multimedia transmission network.

When all input signals of video switch matrix all need cable, electric wire transmission timing, then each road input all is connected to the electric wire transmission and proofreaies and correct and use receiver, and they all have the inhibition circuit of amplitude and frequency correction and common mode disturbances.Utilize amplitude correction knob wherein, thereby can all be transferred to equal amplitude to the synchronous head vision signal of all incoming video signals of each switch matrix, again since the synchronous top of all video input signals all direct current return on the same fixed level, so the video input signals after all are selected not only has equal amplitude, and the top all is on the same level synchronously, the field flyback of electronic switch is nanosecond (ns) level switching time, this is very short, its transition course can be thought does not have great influence, except there being the non-whole field signal to occur, can think that signal is continuous, the inhibition of non-whole field picture intelligence also keeps synchronizing signal to transmit continuously, can guarantee not occur the image that breaks and beat fully.

All add the buffer stage of one-level adjustable gain at each input of switch matrix, can realize that also all input signal amplitudes equate in the same switch matrix, thus the purpose that amplitude output signal equates.

The method of another stable amplitude is with the direct coupling balance shunting active leveling circuit shown in Figure 7 as block diagram.Two kinds of schemes are arranged, earlier scheme shown in narration Fig. 7 a here:

Be directly coupled to the input of balance shunting auto_steady amplitude amplifier 701 through withstanding on synchronously of selecting of the video switch video letter 720 that same reference level and input range have nothing in common with each other, its output signal 721 is except that doing output, also deliver to clamp circuit 702, at this, the clamp pulse that is produced by the composite synchronizing pulse of importing 722 makes its blanking level pincers fix on fixed level with direct manifold type clamp circuit, pincers is decided 723 inputs of delivering to active peak detector 703 of vision signal of blanking level, this active peak detector and general passive peak detector are different, it can detect blanking like clockwork to the amplitude between sync level, and produce one have hour between the direct voltage 724 of constant deliver to the input of error amplifier 704, compare with reference voltage wherein, thereby the error signal 725 that has obtained amplifying, remove to change the AC signal of direct coupling balance shunting auto_steady amplitude amplifier and the automatic flow-dividing control end of direct current biasing signal with this error signal, it changes the interchange shunt volume, error signal is gone to zero, thereby realize the purpose of AC signal fixed ampllitude, meanwhile the also opposite reversing DC component with equivalent remains unchanged the synchronous top level that still keeps output signal in the auto_steady amplitude process.Reference voltage in the regulating error amplifier, the output amplitude that can regulate auto_steady amplitude amplifier stabilization signal.

Fig. 7 b is another kind of technical scheme, its difference is, the synchronous top clamping of input signal 720, directly the synchronous top of the output signal 721 of coupling balance shunting active leveling circuit also is maintained fixed, and be sent to blanking level sample circuit 705, blanking level is taken a sample and keep at this blanking level sampling pulse that is produced by the composite synchronizing pulse 722 of input, 726 of direct voltages that this sampling keeps are sent to error amplifier 704.Compare at this and reference level, its error signal 725 after amplifying removes to control the flow-dividing control end of direct coupling balance shunting auto_steady amplitude amplifier, thereby makes stable output signal in the amplitude of being set up by reference level error signal be gone to zero to change its gain.

Block diagram 8a is the block diagram of video multifunctional m* (n+1) switch matrix, now is described as follows by figure:

The calibrated m road video input signals of being sent here by each the 1st grade of subsystem inserts circuit 801 by the normal field flyback code current type of cross-over connection on every incoming line, inserting normal field flyback sign indicating number in descending subsystem transmission, also deliver in the DC restoration circuit matrix 802 of this video multifunctional m* (n+1) switch matrix, at this, the synchronous top of all incoming video signals all returns to same fixed level, the m road vision signal that calibrated and synchronous top has returned to fixed level is delivered to m input of switch m* (n+1) video switch matrix module 803, this switch matrix has (n+1) individual array, it is controlled respectively by (n+1) group serial or parallel address code, the slice, thin piece of looking used switch arrays is different and different, for illustrate more clearly for the purpose of, each array is independently in the used switch matrix of modern supposition, oneself independently parallel address input end is arranged, wherein n address input end is corresponding with computer or the 1st grade of address code sending here of keyboard in being divided into each control room, and the parallel address code of a remaining array is then corresponding with the counting address code of touring detection counter 810.

The direct manifold type character that the n row video output of switch matrix 803 is delivered to respectively separately embeds circuit 804, can embed time, date character simultaneously and to address character that should the subsystem address at this, this direct coupling character embeds circuit 804, it except whole processing procedures all be directly coupling and, character imbeds, rather than the employing superposing type, its character intensity level is consistent, do not become with background signal, it does not influence the amplitude and the DC level of original background signal.Character forms the synchronizing information of circuit from the direct coupled synchronization split circuit in the non-whole field picture intelligence inhibition circuit 805, it be promptly cut promptly existing, character wild effect in the time of the signal switching can not occurring, address character can insert in each switch matrix successively like this, time, date character then only need disposable insertion in last switch matrix, can reduce the quantity of character inserter widely.

Insert the vision signal of character and delivered to non-whole field image inhibition circuit 865, at this, direct coupled synchronization split circuit wherein and mixed blanking form circuit and isolate composite sync and field synchronization from the vision signals of the fixing synchronous top level that switch matrix 803 is sent here.And the generation composite blanking signal, for other local utilizations in the switch matrix.Meanwhile also the ringing pulse of the address modification sent here by the address processor under this matrix 809 is responded, start the non-whole field image when making the field synchronization of vision signal before switching and suppress door, and after switching the 1st of the new video signal the field system chronizing impulse, or stop this door during the field system chronizing impulse behind several times countings, and the composite blanking pulse that goes out with this gate pulse gating is as storbing gate, make way for transmission continuously under the situation that composite synchronizing pulse during the mixed blanking and burst gating pulse do not change original amplitude and DC level, and in the trace district that has picture intelligence, image is suppressed, replace black level, so just allow the image that breaks of non-whole field not manifest, and fixing synchronizing signal and the burst signal in top transmits continuously synchronously, guaranteed synchronous stability, do not produced jitterbug because of signal switches.

Composite video signal after non-whole field image suppresses is not transferred to when equal when the input at this switch matrix makes amplitude, can couple directly to balance shunting auto_steady amplitude video output amplifier 806, make all output signals all be stabilized in same amplitude at this, and the top level is also identical synchronously.If it is equal that the input signal of switch matrix all has been transferred to additive method, then square frame 806 can be a common video output amplifier, and the both has certain video distribution ability.

Vision signal by amplifier 806 outputs is delivered to respectively in their control rooms separately, also has one the tunnel to deliver to Master Control Room for observation simultaneously.In the field flyback of this vision signal, insert the normal field flyback sign indicating number of sending here by corresponding control room, also be inserted with simultaneously the counter field flyback sign indicating number that inserts by each video camera end and subordinate's subsystem, it is sent in the normal field flyback sign indicating number selector 807, meanwhile suppress circuit 805 and also sent composite sync and field sync signal here by the non-whole field image, form the pulse of normal field flyback sign indicating number storbing gate with their and select normal field flyback sign indicating number part in the field flyback sign indicating number, and be sent to preferential control selector 808 and under address processor 809, in address processor 809, the 1st grade of address code translated, one the tunnel is sent to switch matrix 803, in order to select this row vision signal, preferential control selector 808 is then delivered on another road, in addition the identification code in the normal field flyback sign indicating number that also gating gone out of address processor 809 and the 1st grade of address code curb and follow-up normal field flyback sign indicating number, also deliver to preferential control selector 808.

The 1st grade of parallel address code and follow-up normal field flyback sign indicating number that the normal field flyback sign indicating number that preferential control selector is sent here n control room reaches are wherein made the differentiation of priority level, making to have the 1st grade of identical normal field flyback sign indicating number of address code to exist simultaneously, and when all subsequent code being arranged, only allow the normal field flyback sign indicating number in prepreerence that control room of rank enter this subsystem; When there being the identical normal field flyback sign indicating number of a plurality of the 1st grade of address codes exist simultaneously, but high-level person does not have subsequent code when existing, and then allowing does not second advancedly have the control room of subsequent code to enter this subsystem; When there being a plurality of the 1st grade of address codes identical but when all not having subsequent code, then each subsystem is freely simultaneously, later any that has the control room of subsequent code can enter this subsystem; When the normal field flyback sign indicating number that a plurality of control rooms are arranged simultaneously exists and all subsequent code arranged, but their the 1st grade of address code is all inequality, and then they can enter the subsystem of oneself separately and not disturb mutually; No matter which kind of situation only otherwise enter subordinate's subsystem, each control room can select in m the input signal in m* (n+1) switch matrix any one to supply to observe with the 1st grade of own address code.

A column matrix that has more in m* (n+1) video switch matrix is used for whether having counter field flyback sign indicating number in the touring detection subsystems at different levels.In the touring address generator 810 self-excited oscillator and maximum count being arranged is the counter of m, the address code that its produces is with the touring Switch Video signal of speed faster, the vision signal of selecting is through directly delivering to direct-coupled synchronizing separator circuit 812 behind the coupling buffer 811, isolate composite sync and field system chronizing impulse at this, and be sent to counter field flyback sign indicating number selector 813, select counter field flyback sign indicating number part in the field flyback sign indicating number at this, wherein one the tunnel be sent to alarm count device 814, at this warning in each each road input of going the rounds to occur in the detection is counted, this count value is sent in the alarm command generator 815, and another road output of counter field flyback sign indicating number selector 813 is also delivered in the alarm command generator 815.Number of times in these warnings at different levels that occur in according to counter field flyback sign indicating number, the classification of reporting to the police, send instruction by the control room, to select that road of fixed observer to report to the police or to go the rounds to detect that several roads warning and send the sound and light alarm signal, start various warning devices, take emergency measures and record down the on-the-spot circumstance of spot and date that the incident of noting takes place, time or the like.

Block diagram 8b is m* (1+1) switch matrix.It makes the video selector switch except an array, and another array does do not have the more switches array outside the touring sense switch, and in addition, it does not have priority level control selector yet, because the possibility that it does not exist a plurality of normal field flyback sign indicating numbers to enter this subsystem.

Another difference is when detecting in alarm processor 815 when existing a plurality of inputs that warning is arranged in the subsystem at the corresponding levels simultaneously, the count code that it gets each touring detected alarm times counting, insert in the field flyback of going under the subsystem at the corresponding levels by field flyback sign indicating number inserted mode, transmit to higher level's subsystem, rather than according to circumstances send instruction.

Wherein consistent with Fig. 8 a with the square frame explanation of Fig. 8 a same numeral, repeat no more.

The present invention is owing to transmit forward and reverse field flyback sign indicating number and vision signal simultaneously at same cable or in a pair of twisted-pair feeder, it has reduced the quantity of transmission line widely, has saved system cost, has improved reliability, simplify I﹠M, reduced failure rate.

Owing to adopted multistage multidigit address code mode, the big system of tree-shaped type that formation is made up of multistage subsystem, even make the big system that thousands of camera heads are formed, subsystem, cable or the twisted-pair feeder that enters Master Control Room has only m bar or m right, that sends Master Control Room then has only (n-1) bar or (n-1) right, and m wherein and n are corresponding to m, n value in the m* in the Master Control Room (n+1) the multifunction switch matrix.This has reduced the line that enters Master Control Room widely, the quantity of cable; M* in the subsystems at different levels (1+1) switch matrix then is placed on the most appropriate place of this grade subsystem, make the transmission range of m bar incoming line wherein the shortest, line between itself and higher level's subsystem has only a cable or a pair of twisted-pair feeder, this has reduced the length and the quantity of line between each subordinate's subsystem and higher level's subsystem widely, reduced the quantity of calibration equipments such as required transmitter, repeater and receiver, improved the quality that signal transmits, reduce cost, simplified the inspection and the maintenance of system.

But regardless of different kinds of system can form by the product of the cordwood system type of some standards combination, and these standardized products, can change its function apace because of the choice of the module of the unitization formula of wherein numerous made module or integrated circuit again, this just makes us produce basic product on a large scale, by increase and decrease and renewal certain module or assembly wherein, can make fast reaction to the demand of turn of the market, and adapt to different scales and the different big mini system that requires.

Insert by its last bit address sign indicating number is unified in m* (n+1) switch matrix of the address character of each video camera address final stage subsystem under video camera, partition address character at different levels then can be under this subregion inserts by address code in m* (1+1) switch matrix in higher level's subsystem of that grade successively, date, timing code then can be unified to insert in m* (n+1) the multifunction switch matrix in Master Control Room, the quantity of character inserter can be reduced so widely, the membership of subsystems at different levels and video camera can also be found out in regular turn.

Control priority level arbiter can enter each the video camera address in the whole system, and itself and auxiliary device thereof are controlled a plurality of control rooms without any confusion not producing under the situation of taking a risk and competing.

Synchronously the top returns to same reference level, character formation and circuit for inserting characters on screen to vision signal, directly manifold type separated in synchronization, mixed blanking form, the non-whole field image suppresses and keep transmitting continuously synchronously, straight coupling balance shunting active leveling circuit, directly catches the synchronous row of formula, field oscillator ... or the like technology.Make us not producing the different step image of switching under break image and the visual situation of not beating, in radio and television, also can save the equipment of expensive Frame Synchro and so on.

The inhibition of normal field flyback coded signal in the non-whole field makes the field anticode of positive and negative both direction not produce dislocation or overlapping, has guaranteed the reliable and stable transmission of two-way field flyback sign indicating number.

By transmitter, repeater and receiver to vision signal and the counter field flyback sign indicating number width of cloth, frequently characteristic correction step by step and to the renewal step by step of forward field flyback sign indicating number, can make video and the two-way field flyback sign indicating number can the extra long distance transmission; The amplifying circuit of the anti-strong common mode disturbances of differential electrical flow pattern wherein suppresses to be several times as much as the common mode of single power supply voltage (being equivalent to tens of times of signal voltages) in disturbing on positive and negative both direction, for in the same cable many twisted-pair feeder is transmitted multiple parallel signal (they can all be vision signals, also can be other signals) simultaneously and is not disturbed mutually lay the foundation.This has simplified housing-group signal network and track laying.Connect the sub-level treatment circuit of number behind the input circuit of the anti-strong common mode disturbances of differential electrical flow pattern, it can also be widely used as the interface of the long Distance Transmission of digital circuit, makes the multimedia internet have the ability of better anti-common mode disturbances.

Fig. 1 is the block diagram of whole system of the present invention.

Fig. 2 is block diagram and the emphasis oscillogram that direct coupled synchronization is separated and mixed blanking forms.

Fig. 3 is schematic illustration figure and the corresponding oscillogram thereof that horizontal blanking forms circuit.

Fig. 4 is block diagram and the corresponding oscillogram thereof that normal field flyback sign indicating number inserts.

Fig. 5 is block diagram and the corresponding oscillogram that relevant non-whole field picture intelligence suppresses and keep the continuous strobe pulse formation circuit that transmits of synchronizing information.

Fig. 6 is vision signal and the correction of counter field flyback sign indicating number and the more new-type block diagram and the emphasis oscillogram of inserting again of normal field flyback sign indicating number in transmitter, repeater and receiver.

Fig. 7 a is the block diagram of first kind of scheme of balance shunting active leveling circuit of directly being coupled.

Fig. 7 b is the block diagram of second kind of scheme of balance shunting active leveling circuit of directly being coupled.

Fig. 8 a is the block diagram of video multifunctional m* (n+1) switch matrix.

Fig. 8 b is the block diagram of video m* (1+1) switch matrix.

During concrete enforcement, can as described in the technical solution, handle for big system.

For mini system, can be only just enough with m* (n+1) multifunction switch matrix, it need not to enter subordinate's subsystem, thereby the multistage multidigit address code in the normal field flyback sign indicating number also can be cancelled.

Remaining control room only need select in the 1st grade of subsystem existing signal to observe the preferential arbiter part of then can removing controls in m* (n+1) multifunction switch matrix for having only a control room need enter subordinate's subsystem.

For in-plant TV monitor system, can save transmitter, repeater and receiver.

For transmitting multiple signals simultaneously and (comprise other non-TV signal with comprising many cables in the cable to twisted-pair feeder, for example communication, signals such as phone) under the situation, the input of switch matrix must be added with the receiver of anti-strong common mode disturbances, to suppress the common mode disturbances that many signal parallel transmission may be introduced.

For the system that only needs a control room control, can be remaining (n-1) in m* (n+1) the multifunction switch matrix individual code processor cancellation, replace the array selector of the 1st grade of address code, sometimes also can be divided into the n group to m input, the every group of circulation of can successively or jumping shown, or manual address code input mode, or the like.

When need not to consider the warning problem, can be the encoding and decoding of counter field flyback sign indicating number and insertion portion cancellation, the processing instruction sign indicating number part of the warning category information of normal field flyback sign indicating number also can be cancelled simultaneously.The touring array that detects usefulness also can be cancelled.

When by the control of single control room, and need not that field flyback is switched and the inhibition of non-whole field image, when need not to transmit counter field flyback sign indicating number again, can cancel non-whole field video circuit part.

Below only listed part situation wherein, accepted or rejected or reconfigure when making in the practical application according to user's actual conditions.Enumerate one by one in this inconvenience.

Claims (10)

1, the two-way field flyback sign indicating number and the TV monitor system that can suppress the non-whole field image are one insert coded signal in the field flybacks of vision signal, and the coded signal of vision signal can be is characterized in that by same cable or with the TV monitor system of a pair of twisted-pair feeder transmitted in both directions:

Insert coded signal in the field flyback video camera that sent to each video camera end by single control room and the origin identification sign indicating number and the control code of auxiliary device thereof are not only arranged in the prior art, but also inserted by a plurality of control rooms (following to the origin identification sign indicating number to multistage multidigit address code and alarm condition processing instruction sign indicating number that selector switch matrixes at different levels and video camera end that each is final send, multipole multidigit address code, control code and alarm condition processing instruction sign indicating number abbreviate normal field flyback sign indicating number as), and the various classified information sign indicating numbers of beaming back to master-control room and each sub-control room by each video camera end that comprise warning, touring detection count code (being designated hereinafter simply as counter field flyback sign indicating number) when multiple spot occurs reporting to the police the category information sign indicating number simultaneously in the open circuit information code and the switch matrix at different levels of transmission line, this has not only increased the content of sign indicating number, and single transmitted in both directions that has also realized the many group codes of multiclass with regard to coded signal; It is big to thousands of camera heads that the insertion of multistage multidigit address code can be combined into people easily by the equipment of the unitization formula of some standards, little of the TV monitor system of several camera heads only; Master-control room and a plurality of sub-control room are by control priority level arbiter, can be under the situation of phenomenon of not competing and take a risk, any video camera and the auxiliary device thereof in each subordinate's subsystem in entering part or the whole system carries out independent control in good order; When long distance or extra long distance transmission, between each video camera and its final stage subsystem, between subordinate's subsystem and upper level subsystem, between m* (n+1) switch matrix of the 1st grade of subsystem and master-control room, add between master-control room m* (n+1) switch matrix and each sub-control room in transmitter, repeater, the receiver partly or entirely, make vision signal and forward and reverse field flyback sign indicating number proofreaied and correct or upgraded; The synchronous top of all videos input signal of each switch matrix all direct current returns to same reference level, the treatment circuit of a series of direct manifold types such as the insertion process of the directly video matrix switching of manifold type, separated in synchronization, mixed blanking formation, character embedding, the non-whole field picture intelligence inhibition under the situation that keeps the continuous transmission of former synchronizing signal, the encoding-decoding process of coded signal, forward and reverse field flyback sign indicating number and balance bypass type active leveling circuit, the synchronous top of having guaranteed all outputting video signals also is in fixing DC level, and amplitude equals set point.The image that breaks of non-whole field does not appear in these methods when having guaranteed to switch between non-same synchronisation source vision signal; The continuity of synchronizing signal and the constant amplitude of signal, the consistency on synchronous top, add that image surveillance equipment is capable, the formula of the catching synclator of field scan, when arriving, lock-out pulse reaches the synchronizing separator circuit of anti-interference formula immediately synchronously, make when signal switches be not that image does not break on the monitor, also jitterbug can not occur; For existing image surveillance equipment, row, field scan can not lock the visual of short duration wild effect that occurs immediately when preventing that picture intelligence from switching, except that suppressing the non-whole field image, also need morely to suppress several other whole field patterns and resemble, open picture intelligence again after making row, field scan stable; Equally also can obtain not have the effect that image breaks and beats.A row switch matrix that has more in m* (1+1) switch matrix in the m* of master-control room (n+1) switch matrix and the subsystem at different levels, be used for the warning category information sign indicating number of counter field flyback sign indicating number and the count code when in subsystems at different levels, occurring a plurality of warning class sign indicating number simultaneously, and the breaking alarming signal carries out, and high speed is touring to be detected, so that decision making in master-control room and each control room, be to force incision prepreerence a road or the selection of detection is gone the rounds on each road of reporting to the police, and send command adapted thereto.

2, the two-way field flyback sign indicating number of addressing according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: normal field flyback sign indicating number is according to identification code, the 1st grade of address code, the 2nd grade of address code ... the final stage address code, the control code of video camera and auxiliary device thereof, the order of alarm condition processing instruction sign indicating number is inserted in respectively in the field flyback of full line after the post-equalizing pulse, in order to adapt to existing all television systems in countries in the world, generally the 7th row from odd field or certain later row begin to be advisable, the corresponding row that even field is then got various standards begins to get final product, and they insert a circuit at master-control room and each sub-control room by the sign indicating number of current source type and insert in the field flyback of corresponding incoming video signal; The warning category information sign indicating number of each video camera end in the counter field flyback sign indicating number, then in the codec of video camera, insert circuit by the sign indicating number of curtage type, insert and be close in the video output signals field flyback in the normal field flyback sign indicating number active line afterwards, the touring count code that occurs the multiple alarm category information when obtaining that detects in the subsystems at different levels, then in subsystem separately, insert the output of circuit at this grade switch matrix with the current source type sign indicating number, according to the 1st grade, the 2nd grade ... the order of subsystem is inserted in each row of next-door neighbour's warning class sign indicating number back successively, no matter it is in insertion state or rest state the high output impedance of current source type insertion circuit, can not destroy transmission line, input, the matching status of output, even just inserting simultaneously at same cable or with a pair of twisted-pair feeder two ends, counter field flyback sign indicating number, can not influence each other yet, therefore much better than general voltage addition mode effects.

3, the two-way field flyback sign indicating number of addressing according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: all control priority level arbiters are in m* (n+1) the multifunction switch matrix at master-control room, the normal field flyback sign indicating number that inserts in the vision signal of sending here by master-control room and each sub-control room, in the sign indicating number treatment circuit of array separately, isolate pure normal field flyback sign indicating number, the 1st grade of address code wherein taken out, and be sent to the address input end of column switch matrix, to press the address choice vision signal, again identification code in the normal field flyback sign indicating number and first-level address sign indicating number are curbed, remaining from the 2nd grade of address code and following normal field flyback subsequent code, then the 1st grade of address code, normal field flyback sign indicating number and normal field flyback subsequent code all are sent to control priority level arbiter, at this 1st grade of address code that appears at each control end simultaneously compared, according to they whether identical with have or not follow-up field flyback sign indicating number to judge: identical and when follow-up normal field flyback sign indicating number is all arranged when a plurality of the 1st grade of address codes, in then during the non-whole field of rank override person's normal field flyback sign indicating number after the field flyback of original signal is switched, equally with the normal field flyback sign indicating number of other all identical address all close, in order to avoid with counter field flyback sign indicating number generation warfare, and when the 1st whole of the new video signal that occurs thereafter, then the highest normal field flyback sign indicating number of this priority level is inserted in the vision signal of this address with the current source inserted mode, and to the 2nd grade and following subsystem and the transmission of video camera extreme direction; When arriving the 2nd grade of subsystem, code processor in the 2nd grade of subsystem takes out the 2nd grade of address code in the normal field flyback sign indicating number, in the field flyback of original signal, select the new video signal of this address in this m* (1+1) switch matrix to transmit to the higher level, during non-whole field, turn-off the coded signal inserter simultaneously, and after first whole arrival the time normal field flyback sign indicating number inserted to subordinate transmit, up to the video camera end that enters this address by the last grade subsystem; Though sign indicating number is identical when the first-level address, priority level is high there is no subsequent code, then makes way for time preferential rank but has the normal field flyback sign indicating number in the control room of subsequent code to enter subordinate's subsystem, and repeat above-mentioned process; Though when the 1st grade of address code is identical, when all not having subsequent code, then each control room can freely select in all the 1st grade of subsystems any one signal for observation by the 1st grade of address code of oneself; When only there was subsequent code in a control room, then this control room can freely enter each subsystem; When the 1st grade of address code in each control room was inequality, the subsystem that then can freely enter oneself was separately controlled; Warning category information sign indicating number in the counter field flyback sign indicating number is to be inserted by the synchronizing information location of video camera self, and it does not have the handoff procedure of signal, dislocation can not occur; The touring detection count code that occurs reporting to the police simultaneously with multichannel in the one-level subsystem in the counter field flyback sign indicating number is to force in the vision signal field flyback of incision to insert after warning, it also can inconsistent phenomenon occur in the non-whole field after switching, so should in non-whole field, close, and when thereafter the 1st whole, insert again again; Detected channel breaking alarming signal is handled by the same mode of alarm count sign indicating number in each subsystem.

4, the two-way field flyback sign indicating number of addressing according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: during for long distance or extra long distance signal transmitted in both directions, look balance or uneven the transmission at the transmitter that transmission line, cable transmitting terminal add, its output also can be balance or unbalanced, and their energisation mode can be the voltage drive formula, it also can be the current excitation formula, they all have amplification and high frequency pre-emphasis characteristic, to compensate the amplitude fading that may introduce in the long Distance Transmission process and the frequency distortion of high intermediate frequency; Receiver that receiving terminal adds amplitude fading and frequency distortion after to long Distance Transmission all need to proofread and correct, more prior is may introduce very strong common mode disturbances in the long Distance Transmission process---even much larger than useful signal itself, therefore its input stage should be the differential type voltage or the imported amplifier of electric current that can resist strong common mode disturbances, and amplitude and frequency characteristic are all had very strong calibration capability; After the long Distance Transmission, the high intermediate frequency composition of signal (comprising vision signal and counter field flyback coded signal) all can have very big decay, the outer height of multistage ring, the continuous adjustable segmented compensation network of intermediate frequency stepping and the constant multistage direct coupling cascade compensation amplifier of change in gain output dc point, comparable general indemnity amplifier has the continuously adjustable compensation range of wideer stepping, and be not prone to parasitic oscillation, whole system is not introduced visible low-frequency distortion; Repeater then is that receiver and transmitter are combined, it needs the compensation except amplitude and the frequency decay to the leading portion transmission line, also to promote amplitude and high frequency preemphasis for the transmission of back segment transmission line, to improve the distance of refile, its input circuit is also wanted to suppress strong common mode disturbances equally; For the normal field flyback sign indicating number that transmits in transmitter, repeater and the receiver field flyback, do not resemble and to compensate and to proofread and correct by amplification system vision signal and the counter field anticode, this is because the one-way of amplifier determines, then adopt the mode of amplification, shaping, separation, insertion again to make it in transmitter, repeater and receiver, upgrade one by one for normal field flyback sign indicating number, equally also played the corrective action that plays the same tune on different musical instruments; The current mode inserted mode of field flyback coded signal, because the very high match condition that does not influence transmission line of its output impedance, even insert the two-way field flyback sign indicating number of positive and negative both direction simultaneously, can not produce ill effect each other yet and influence the matching properties of cable at same cable or with a pair of twisted-pair feeder two ends.It is much better to insert effect than voltage addition type when input/output port inserts.

5, the two-way field flyback sign indicating number of addressing according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: all video input signals of all video switch matrix are before inserting the switch matrix module, it pushes up all synchronously, and direct current returns to same fixing DC level, after switch switches, the synchronous top level of all switching in video data signals is still constant, time, the embedding of date and video camera address character (different) with general stacking method, also be under the situation of top clamping synchronously, to use character pulse, a DC level (but manual adjustments) that is equivalent to the character tonal gradation is embedded in the picture intelligence as switch; Directly the coupled synchronization split circuit then is under the constant situation of all Switch Video signal Synchronization top DC level, be directly coupled in the amplifier of a direct-current coupling---it can be the resolution element formula, also ic-type---synchronous head in the signal is preferentially amplified, thereafter through the two-way cutting of direct-current coupling formula to remove the interference that desynchronize top and synchronous root may exist; With the switching mode integrating circuit to obtain field system chronizing impulse accurately, sort circuit is even without the pre-and-post equalization pulse even do not have a plurality of serrated pulses, and the pulse of having only single broad also can be isolated field system chronizing impulse when making field system chronizing impulse exactly, it can simplify synchronous integrated circuit widely, when novel high definition TV is formulated standard, not anti-the employing; With monostable interference and the 2 times of line frequency compositions of cancellation that may exist beyond the horizontal synchronizing pulse of removing; Remove to catch the multivibrator formation line-frequency blanking pulse that the locking of formula ground can obtain to be ahead of lock-out pulse forward position pulse edge with the line frequency lock-out pulse; Produce new vertical blanking impulse with the leading Eq pulse in the composite synchronizing pulse; The row vertical blanking impulse mutually or and obtain composite blanking pulse; Because these all obtain under direct-coupled situation, electronic analog swtich was to finish in the time of nanosecond (ns) level when signal switched in field flyback, we can say does not have the transition course to occur, thereby the taking-up of composite sync, row, field synchronization and mixed blanking, and form also can to say so and promptly cut promptly now, do not have general AC coupled separated in synchronization and adopt phase-lock mode to obtain the transition course of composite blanking signal with synchronous integrated circuit; The balance shunting that directly is coupled active leveling circuit, the input signal level on top is synchronously fixed, when the changes in amplitude of input signal, the blanking level of output signal, or the amplitude of synchronizing signal also can change, the time constant of the active peak-detector circuit of its blanking level sample circuit or synchronous amplitude is all very little, follow the tracks of very fast, so the fiduciary level that detected variable signal and is set up in advance compares, and an error signal, go to control the gain of balance shunting active leveling circuit with this error signal, keep amplitude output signal constant when input signal amplitude is changed, the dc shift that change in gain causes, then disappear mutually and balance with the anti-phase DC component of another dc balance arm equivalent, thereby when the input signal amplitude that switches changed, output amplitude was constant, and the top level is also constant synchronously; The picture intelligence that occurs in the non-whole field of the back new signal after last signal field retrace interval switches, by the field system chronizing impulse of last signal and the composite blanking pulse of the non-whole field gate pulse gating that field system chronizing impulse determined of back one signal, picture intelligence in the cancellation non-whole field active line, replace black level, and the synchronizing signal composition that keeps wherein continues transmission, the image that breaks that just can not occur non-whole field like this on the display: the row of graphics monitor, vertical oscillator is as adopting the formula of the catching synclator among the present invention, which kind of state its vibration originally when lock-out pulse arrives is in and all can be compelled to catch in a fixing initial level, only after lock-out pulse disappears, it is the initial state starting oscillation from then on, therefore, the sort circuit and the method for synchronization, can when arriving, first pulse live synchronously exactly, there are not the synchronous transition course of general oscillator and the seizure and the maintenance process of automatic frequency control and automatic phase control etc., therefore as long as the image with regard to not occurring beating and breaking on monitor of the pictorial information in the elimination non-whole field; Also do not possess above-mentioned characteristic for existing graphics monitor, for removing the influence of transient process from, except the pictorial information of cancellation non-whole field and, also need a few field pattern image informations of eliminating thereafter to make more and do not show, to escape transient process; Thisly catch formula week step oscillator to also have a very big advantage be that its self-oscillation period ratio is short synchronizing cycle, but also can obtain the adjustable impulse wave that is ahead of the lock-out pulse forward position of leading amount---this is impossible realize at existing all method for synchronous; When no signal, the row of television monitoring, field oscillator will be operated under short cycle and less row, the field scan amplitude state, save power during to no signal, and the guard rows field output stage all is good; This is not just at televimonitor, can use in the television receiver, also can be used in computer monitor and the similar products like acquisition on adjustable leading edge, also can be easily partly move on to screen center to row, field blanking for observation, make without oscilloscope and just can check synchronizing characteristics in the vision signal.

6, two-way field flyback sign indicating number according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: under the situation that keeps synchronizing information to transmit continuously, the processing mode that suppresses the non-whole field pictorial information, can not occur breaking under the situation of the asynchronous signal characteristic of image and jitterbug can be saved expensive device such as Frame Synchro when being used in field of broadcast televisions.

7, two-way field flyback sign indicating number according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: direct manifold type synchronizing separator circuit wherein, mixed blanking forms circuit, character embeds circuit, keep transmitting and the treatment circuit of inhibition non-whole field image continuously synchronously, the coding-decoding circuit of forward and reverse field flyback coded signal, the current mode of coded signal is inserted circuit, balance bypass type active leveling circuit, the row that the formula of catching is synchronous, the field oscillator circuit, the priority level judging circuit of many group normal field flyback sign indicating numbers, circuit is inserted in the renewal of normal field flyback sign indicating number, touring testing circuit of counter field flyback sign indicating number or the like can make module and then make integrated circuit and is beneficial to the combination of new product design the time carrying out unitization to accelerate design process.

8, two-way field flyback sign indicating number according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: mixed blanking forms the formation of the horizontal blanking impulse in the circuit, is with catching that synchronous the obtaining of formula is ahead of the RC oscillator of lock-out pulse forward position pulse edge or with the method realization of counting; The formation of vertical blanking impulse is directly to utilize leading Eq pulse to be realized by monostable circuit or monostable door gating counting; Composite blanking pulse then by row, vertical blanking impulse mutually or and produce; When wherein catching first pulse arrival of formula synclator, it can be synchronous exactly, synchronizing cycle, stable synchronous and the characteristics such as adjustable pulse edge that can obtain to be ahead of the lock-out pulse forward position of high frequency multiplication made it also can obtain purposes widely at other field less than natural vibration period.

9, two-way field flyback sign indicating number according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: keep synchronously continuously under the situation of transmission, non-whole field image suppressor pulse is to remove the set rest-set flip-flop with the pulse of switching edge identification circuit generation, and with the field system chronizing impulse of following closely original video signal this rest-set flip-flop that goes to reset, meanwhile switch look signal and set in addition 2 as non-whole field or comprise the rest-set flip-flops of many doors of non-whole field, by isolated first field system chronizing impulse of the vision signal after the new switching and the carry pulse behind some countings this 2 rest-set flip-flops that reset respectively, and obtain a non-whole field or comprise the gate pulse of some field widths of non-whole field, wash away the gating composite blanking signal with this portal vein, go composite synchronizing signal and burst signal in the gating vision signal with this composite blanking signal of selecting again, and inhibition picture intelligence wherein, replace black level, the composite synchronizing signal of the composite video signal outside the gate pulse in unaltered door constitutes a continuous TV signal continuation transmission with burst signal.

10, two-way field flyback sign indicating number according to claim 1 also can suppress the TV monitor system of non-whole field image, it is characterized in that: the transmitter of being addressed, repeater and receiver, the input circuit of the anti-common mode disturbances of difference between current somatotype and the output drive circuit of current mode have been adopted, and can directly be coupled step by step, gain changes and constant the carrying out high, intermediate frequency on a large scale and compensate in that ring is outer of dc point, and do not produce self-oscillatory high intermediate frequency compensated amplifier, they carry out amplitude and frequency correction to vision signal and counter field flyback sign indicating number, and suppress common mode disturbances; Normal field flyback sign indicating number is then by amplification, double limiting shaping, current type inserts and obtains upgrading again; The circuit of the anti-strong common mode disturbances of difference between current somatotype wherein, if after connect digital processing circuit, then can be widely used in the digital circuit interface, improve the jamproof performance of multi-media network greatly; When the anti-strong common mode disturbances circuit of differential electrical flow pattern is used for low frequency signal, can resist number to decuple the common mode disturbances (being equivalent to the hundreds of times of interference to signal) of supply power voltage on positive and negative both direction, this also has been widely used in the other field that extracts weak signal from strong common mode disturbances.

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