CN201830378U - Co-cable transmission equipment of security monitoring system - Google Patents
Co-cable transmission equipment of security monitoring system Download PDFInfo
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- CN201830378U CN201830378U CN2010202036166U CN201020203616U CN201830378U CN 201830378 U CN201830378 U CN 201830378U CN 2010202036166 U CN2010202036166 U CN 2010202036166U CN 201020203616 U CN201020203616 U CN 201020203616U CN 201830378 U CN201830378 U CN 201830378U
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Abstract
The utility model discloses co-cable transmission equipment of a security monitoring system, which relates to the technical field of signal transmission. The co-cable transmission equipment comprises at least one co-cable modulator, at least one mixer, at least one co-cable demodulator and a radio frequency coaxial cable, wherein one end of the co-cable modulator is correspondingly connected with a monitor, the other end of the co-cable modulator is connected with the mixer, a plurality of mixers are connected with the co-cable demodulator through the same radio frequency coaxial cable, and the co-cable demodulator is connected with a hard disc camera or a personal computer (PC). The co-cable transmission equipment has simple wire distribution, strong anti-jamming effect and good signal transmission effect, and both the labor and the materials are saved.
Description
Technical field
The utility model relates to the signal transmission technology field, exactly relates to a kind of common cable transmission equipment that can transmit multichannel supervisory signal and control signal simultaneously.
Background technology
On road, in the bank, in the supermarket, in hotel and the sub-district, be found everywhere the monitoring probe, we can say that video monitoring has been deep into each corner of society, again neither administration and the distinctive safety and protection system of privacy mechanism.Along with supervisory control system is deep into all trades and professions, it is complicated unusually that transmission environment also becomes.Move towards ordinary populace when radiotechnics more, when broadcasting station, mobile communication and wireless device are immanent, make space electromagnetic environment use unprecedented the deterioration, this also has higher requirement to the interference free performance of monitoring transmission system.Be accompanied by the universalness that monitoring is used, its transmission scale also develops into tens even a hundreds of point by original several points, tens points, and it all is point-to-point mode that now traditional supervisory control system connects up, as shown in Figure 1.Traditional as can be seen from Figure 1 each video camera of supervisory control system all will be laid a video line and a power line to central machine room, if band cloud platform control and band audio frequency also to add a control line and a power line to central machine room.This mounting means makes the wiring of whole monitoring system engineering quite complicated, and workload is also quite big.
The utility model content
For solving the problems of the technologies described above, the utility model proposes altogether cable transmission equipment of a kind of safety defense monitoring system, the utility model wiring is simple, strong interference immunity, signal transmission effect are good, has saved manpower and materials.
The utility model is realized by adopting following technical proposals:
A kind of safety defense monitoring system is the cable transmission equipment altogether, it is characterized in that: comprise at least one common cable modulator, at least one blender, at least one common cable demodulator and radio frequency coaxial-cable, an end of cable modulator correspondence connects supervising device altogether, the other end connects blender, a plurality of blenders connect cable demodulator altogether through same radio frequency coaxial-cable, and the cable demodulator connects DVR or PC altogether.
Described cable modulator altogether comprises video input processing section, audio frequency input processing section and cradle head control signal output processing part branch, wherein, described video input processing section comprises carries out the clamp circuit that clamper is handled to vision signal, the video modulation circuit that is connected and vision signal is carried out the video modulation processing with clamp circuit, with be connected with the video modulation circuit and, obtain the rf modulated signal of video the low pass filter that vision signal is handled; Described audio frequency input processing section comprises the audio frequency amplifier that audio signal is carried out processing and amplifying, the audio frequency FM modulator that is connected and audio signal is carried out the FM modulation with audio frequency amplifier, be connected and audio signal carried out the audio modulating circuit of rf modulations with the FM modulator, be connected with audio modulating circuit and audio signal is handled, low pass filter obtains the rf modulated signal of audio frequency; The rf modulated signal of video and the rf modulated signal of audio frequency mix after radio frequency coaxial-cable inputs to common cable demodulator; Described cradle head control signal output processing part branch comprises the low pass filter that control signal is handled, the FSK demodulator that is connected and control signal is demodulated to the Transistor-Transistor Logic level signal with low pass filter, be connected with FSK demodulator and the Transistor-Transistor Logic level conversion of signals is become the level shifting circuit of RS485 signal, the signal after the conversion outputs on the The Cloud Terrace of monopod video camera.
Described altogether cable demodulator receives the modulation signal that sends from cable modulator altogether, and comprises that video output processing part branch, audio frequency output processing part that the modulation signal of input is handled are divided and cradle head control signal input processing section; Wherein, described video output processing part branch comprises exchanges the low pass filter that the non-video carrier wave in the system signal filters, and is connected and carries out the video demodulator of video demodulator and output processing with low pass filter; Described audio frequency output processing part branch comprises exchanges the low pass filter that the non-audio carrier wave in the system signal filters, the audio demodulator that is connected and carries out the audio frequency demodulation with low pass filter is connected and audio signal is carried out the audio frequency amplifier of processing and amplifying with audio demodulator; Described cradle head control signal input processing section comprises the level shifting circuit that the RS485 conversion of signals in the modulation signal is become the Transistor-Transistor Logic level signal, the fsk modulator that is connected and the level signal after the conversion is carried out the frequency shift keying modulation with level shifting circuit, the low pass filter that is connected with fsk modulator and the signal after the modulation is handled, filtered signal is fed through common cable modulator through splitter.
Described supervising device comprises video camera, monopod video camera, monitor and alarm.
Described video camera respectively through video line and power line together the cable modulator be connected.
Described monopod video camera respectively through video line, power line and control line together the cable modulator be connected.
Described monitor respectively through tone frequency channel wire and power line together the cable modulator be connected.
Compared with prior art, the technique effect that the utility model reached is as follows:
1, adopt the utility model to save wire rod effectively.Can see very clearly that from Fig. 1 and Fig. 6 contrast each video camera all will be put two to three cables to Surveillance center the conventional transmission mode, and all video cameras of front end can as long as arrive Surveillance center's utmost point with a cable in being total to the cable transmission means.
2, the cable transmission equipment is saved human resources altogether.Because altogether a plurality of blenders connect cable demodulator altogether through same radio frequency coaxial-cable in the cable transmission means, thus be easily efficiently in engineering construction, and wiring is simple, strong interference immunity, signal transmission effect are good, has saved manpower and materials.
3, dilatancy is good.Because two cables all will be put in each control point to the center, will reappose cable so will increase a point in traditional approach, this has just caused dilatancy bad.In being total to the cable transmission means, the cable modulator is just passable altogether as long as radio frequency coaxial-cable is cut off one of back adding to increase monitoring station.Dilatation is very convenient.
Description of drawings
The utility model is described in further detail below in conjunction with specification drawings and specific embodiments, wherein:
Fig. 1 is traditional supervisory control system wiring diagram
Fig. 2 is for being total to cable modulators modulate signal graph
Fig. 3 is for being total to cable transmission system standard transmission procedure chart
Fig. 4 is for being total to the transmission course figure of cable transmission system in monitoring is used
Fig. 5 is for being total to cable transmission equipment wiring diagram
Fig. 6 is for being total to cable modulator block diagram
Fig. 7 is for being total to cable demodulator block diagram
Embodiment
Embodiment 1
The utility model discloses a kind of safety defense monitoring system cable transmission equipment altogether, comprise at least one common cable modulator, at least one blender, at least one common cable demodulator and radio frequency coaxial-cable, an end of cable modulator correspondence connects supervising device altogether, the other end connects blender, a plurality of blenders connect cable demodulator altogether through same radio frequency coaxial-cable, and the cable demodulator connects DVR or PC altogether.
Wherein, common cable modulator and common cable demodulator can adopt common equipment of the prior art to handle.
Embodiment 2
On the basis of embodiment 1, the utility model one preferred forms is:
As shown in Figure 6, be total to the reverse application that the cable modulator has adopted the cable TV principle.Behind the vision signal process clamping from video camera, carry out video modulation, obtain the rf modulated signal of video image.From the audio signal of front end pick-up after audio frequency amplifies, carry out audio frequency FM modulation, carry out rf modulations again, audio frequency after obtaining modulating is penetrated signal, after again the rf modulated signal of video image being carried out low-pass filtering, mix the radiofrequency signal that number becomes on one tunnel certain fixed frequency with the signal after audio modulation signal being carried out low-pass filtering, and send to Surveillance center through bus.The cable modulator receives simultaneously from the signal after Surveillance center's cradle head control modulation altogether, after the control signal of receiving Surveillance center, after low-pass filtering, be sent to FSK demodulator, signal is demodulated to the Transistor-Transistor Logic level signal, again the Transistor-Transistor Logic level signal that obtains is sent in the level shifting circuit afterwards, convert Transistor-Transistor Logic level to the RS485 signal, the signal after will changing again outputs to and realizes cradle head control on the front end platform.As shown in Figure 7, cable demodulator workflow is as follows altogether: the multiple signal from the front end modulation is divided into three to signal one through splitter, one the tunnel enters low pass filter filters the non-video carrier wave in the signal, signal after the filtration is sent into video demodulator and is demodulated vision signal, and the vision signal that demodulation is come out is sent for DVR and used.The second road signal filters the non-audio carrier wave in the signal after entering low pass filter, and the signal after the filtration is sent into and demodulated audio signal in the audio demodulator, exports after audio frequency amplifies in the audio signal that demodulation is come out and uses for DVR.Send in the fsk modulator after level translator becomes Transistor-Transistor Logic level to the RS485 conversion of signals from the cradle head control signal of cradle head control device and to modulate, signal after the modulation enters low pass filter, and filtered signal is sent into front end cable modulator altogether through splitter.Described supervising device comprises video camera, monopod video camera, monitor and alarm, can adopt simultaneously, also can select.Described video camera respectively through video line and power line together the cable modulator be connected.Described monopod video camera respectively through video line, power line and control line together the cable modulator be connected.Described monitor respectively through tone frequency channel wire and power line together the cable modulator be connected.
Embodiment 3
Another preferred embodiments of the utility model is as follows:
1 is total to the application characteristic of cable supervisory control system
The expansion of monitoring application and the expansion of system scale, the farther distance of transmission, promoted the change of monitoring transmission means, developed into wideband diversification transmission such as cable (radio-frequency carrier), network, microwave, optical cable, twisted-pair feeder and deposit pattern altogether by original video baseband transmission.Wideband cable " Integrated Service Digital Network " TV monitoring and controlling transmission system altogether disturbs to solve the monitoring transmission, realize that pilot signal bus system remote transmission is a design object, both guaranteed the transmission quality of image and control signal, stability, reliability and the practicality of system have been guaranteed again, changed traditional loaded down with trivial details wire laying mode, improved system's interference free performance, some knotty problems of monitoring transmission are readily solved.
Characteristics one: wiring is simple: this system can realize that in actual applications 90 road pilot signals (comprising video, audio frequency and control signal) reach several kilometers far away by a coaxial cable transmitted in both directions, makes pilot signal realize intensive bus system transmission.
Characteristics two: wideband is integrated: the coaxial cable frequency bandwidth is 0～1000MHz, because wideband has only utilized the wherein space of 860MHz when pulling the monitoring transmission signals altogether, so in the transmitting, monitoring signal, also reserved the extending space of warning, broadcast system, made the transmission of multisystem multiple signals be pooled to a cable transmission and realized that reduced form is integrated.
Characteristics three: transmitted in both directions: when signal transmits, utilize 5～65MHz to come the data-signal control of downlink transfer to front end platform and camera lens, utilize 110～860MHz to come uplink monitor video signal and audio signal, and 65～87MHz is the isolation strip of signal transmitted in both directions, and uplink and downlink signals is taken their own roads in transmission and can not conflicted.
Characteristics four: distance is anti-interference: be designed on the high frequency looking audio frequency and control signal, carrier signal only decays during transmission, and unattenuated vision signal, only satisfy carrier-to-noise ratio, and allow the serial connection casacade multi-amplifier during transmission, make transmission range break through 500 meters bottlenecks, can reach 5000m farthest, this has just prolonged the pilot signal transmission range greatly, has solved the interference problem of common frequency.
2 are total to the technical characterstic of cable transmission
(suggestion use SYV75-5 above cable) transmission reaches audio frequency, video and the control signal of 90 points (with economic and practical recommended amount) and the transmitted in both directions of power supply signal (can self-defined passage) in a coaxial cable, we can transmit RS232 and RS485 industry control message on data-signal, also can mate, adopt the transparence transmission means with the agreement of other manufacturers; And can support the cable of a plurality of subregions to carry out overlap-add procedure.
3 are total to cable monitoring application technology and operation principle
The cable TV technology has had the history of decades till now from introducing China, and cable television system has all been installed in China city, rural area at present, and its technology is very ripe, and equipment performance is reliable and stable.The cable monitoring is the reverse application of cable TV technology altogether, utilizes mature and stable high-frequency transmission technology such as frequency division multiplexing (FDM) and frequency shift keying data modem to realize the monitoring transmission means of " Integrated Service Digital Network ".
(each composite video signal takies the 8MHz bandwidth in China's cable TV standard application PAL D/K standard coaxial cable to be divided into different transmission channels, wherein the image modulated subcarrier technique takies 6MHz, the sound accompaniment frequency modulated carrier can mark off more than 90 channel according to the present radio and television standard of China from 112.25 to 90MHz on the 6.5MHz of image carrier subcarrier).The wideband that different monitor video signals is input to different channel is total on the cable modulator, carry out double conversion modulation and spiral filtering, indexs such as image spectrum and phase place are carried out being sent on certain channel high frequency carrier after the strictness control, and output is multiplexed on the coaxial cable; The multi-channel video carrier wave of modulated different channel (being radio-frequency carrier) signal is by the signal branch device, be pooled on the coaxial cable, and be transferred to Surveillance center through coax network and signal amplifying apparatus, radio signal transmission is after Surveillance center, enter the bi-directional data channel-splitting filter, high-pass filtering module by wherein filters descending control signal, only allow the above video high frequency carrier of 87MHz pass through, be assigned on the multi-channel video demodulator device, demodulator carries out multi-channel demodulator to the pilot signal in the coaxial cable and is reduced into normal video base band and audio signal, delivers to monitor at last, DVR or other audio frequency and video treatment facility.From DVR, the RS232/RS485 control signal of equipment such as PC supervisory keyboard is carried out data-modulated by modulator and is arrived radio frequency (on 38～40MHz) carrier waves, enter data decoder low pass filter downlink transfer, be transferred to each common cable modulator through coax network, control data signal is demodulated to the industrial RS-485 control signal of standard by the frequency shift keying demodulation module that is total to the cable modulator, deliver to decoder output The Cloud Terrace, the camera lens control level, thereby on the driving The Cloud Terrace, down, a left side, right or automatic rotation is controlled three variable lenses and is driven aperture, focus on, become doubly action.
4 are total to the basic comprising of cable supervisory control system
Altogether the cable supervisory control system generally be by the reception of the conversion of signals collecting and performance element, signal and transmission unit, signal relay amplifying unit, signal and converting unit, signal controlling and processing unit totally five big units constitute, can be divided into more assist control modular unit if consider other peripheral apparatus, its system configuration and flow process and corresponding with practical application as shown in Figure 3 and Figure 4.
5 are total to the noiseproof feature of cable monitoring
The cable monitoring has stronger Anti-Jamming Technique advantage altogether, and this is that video baseband transmission mode is not available.Because of the video transmission during cable is monitored altogether is to utilize the frequency range of 112.25～860MHz in the coaxial cable to transmit, mode by the high frequency carrier modulation has been avoided common interfering frequency, traditional base band video transmission utilizes 0～6MHz of coaxial cable to come the images signal, used band is in the common interference frequency band, because of the frequency distribution of common video interference source below 45MHz, as seen the image transmission frequency and the interfering frequency of the common cable monitoring of wideband have very wide frequency band distance, and the common interference frequency is difficult to the radio-frequency carrier picture signal is disturbed.This has just guaranteed the image transmitted quality, makes places such as power plant, transformer station, data switching center, the cinema monitoring transmission of various electromagnetic environment complicated factory, sub-district, street, colliery and hyperbaric environment no longer be subjected to the influence of common video interference source.So altogether the cable monitoring makes widening of application of monitoring open new page with its unique technique characteristic a kind of effective sharp weapon of can yet be regarded as in the abominable Anti-Jamming Technique means of electromagnetic environment.
6 are total to the capacity and the extended attribute of cable supervisory control system
Big characteristics of cable monitoring have been simplified wire structures exactly altogether, have broken through problems such as traditional monitoring wiring is loaded down with trivial details, complicated, time-consuming, consumption worker, make the many signals of multisystem utilize a coaxial cable to carry out transmitted in both directions.
To be total to the be applied as example of cable monitoring in the detention house: TV monitor system is put in prison the convict in order to real time monitoring active situation need be installed in this detention house, this guards 100 of all prisons, for seeing that panorama does not stay the dead angle, each prison is established 1 of control point, 1 of listening point, 50 of conduct monitoring at all levels points such as movable square and gateway enclosure wall be band cloud platform controlled function all.150 of above-mentioned total control points, wherein 100 of dead points, 50 of moving points, 100 of listening points.Under the situation that does not need secondary control, need 150 of cloth video lines with traditional wire laying mode, 50 of control lines, 100 of listening-in lines, disregarding except power line need cloth cable 150+50+100=300 root.This shows, this mode Master Cost height, it is loaded down with trivial details, great in constructing amount to connect up, and safeguards inconvenience, expends a large amount of man-hours.
If utilizing altogether, how cable monitoring transmission system sight is? by the introducing us and can know of above system, coaxial line of cable transmission means can transmit 90 road pilot signals altogether, comprises 90 road videos, 90 road audio frequency and 1 tunnel control signal.So above-mentioned project only uses 2 coaxial cables just passable theoretically.Thereby we can obtain one and clearly compare, and utilizing altogether, required number of cables, material cost, the construction period of cable transmission means all can reduce greatly.This also is total to the place of cable monitoring advantage just, not only can save material cost, the simplified wiring structure, and can shorten construction period for the engineering merchant, and reduce wire rod and construction human input, reduce expenses, simplify later maintenance.And every cable of cable system can hold 90 tunnel vision signals at most altogether, suitably adjusts promptly to have very strong extendible capacity ability with line quantity.
7 are total to the transmission range of cable supervisory control system
Video baseband transmission mode adopts 0～6MHz of coaxial cable to come transmission video signal, and colourity, brightness and saturation all have the decay of distinct program in transmission course, and especially the decay of high frequency color is bigger.The conventional video amplifier is difficult to accomplish that maintaining favorable linearity in the bandwidth from several Hz to several MHz amplifies, thereby makes signal can only transmit 300 meters in the SYV75-3 coaxial cable, and distance surpasses this boundary just need add the video amplifier.This meeting in transmission course of cable produces thermal noise in addition, signal to noise ratio is descended, and the video amplifier also amplifies in proportion to noise signal in amplifying signal, transmit again after the amplification that picture quality is glided, can't reach the national standard of supervisory control system image more than 4.5 grades.If there is interference signal to invade in the cable, system signal noise ratio will exacerbated, and picture quality will be poorer.
Common cable monitoring makes full use of a gigabit frequency bandwidth, and bandwidth is divided into different channels, with common cable modulator video/audio signal is modulated on the different passage high frequency carriers and transmits by coaxial cable.The carrier signal that only decays when signal transmits in cable, unattenuated vision signal, and brightness, colourity and saturation can the synchronous modulation transmission.Can add trunk amplifier after the decay of carrier signal level and amplify, as long as guarantee that enough carrier-to-noise ratios promptly can solve.The just high-frequency carrier signal that amplifier amplifies in the system, the frequency spectrum of image, phase place aliquot do not change, and also do not have noise and invade, and this just makes the pilot signal transmission range well be extended, and picture quality does not have greater loss.The general permission six grades of amplifier serial connections in cable TV network, this just makes the transmission range of pilot signal can reach more than 3000 meters, that is to say that it is to utilize more than 10 times of video baseband transmission distance that application is total to the cable transmission range.As seen, the cable monitoring had both prolonged transmission range altogether, had guaranteed the image transmission quality again technically, had realized that the mileage formula of pilot signal transmission is crossed over.
For the relay pattern that the transmission range more than the 3-5 kilometer can adopt HFC photoelectricity to mix, nearly 90 tunnel the radiofrequency signal after being total to the cable modulators modulate adopts a radio frequency optical transceiver to transmit and far reaches 60 kilometers, has good economic effect.Transmission mode with light-electricity complementary has solved neatly from being distributed to concentrated remote then transmission demand.This mode has good practicability and technical advantage in the monitoring of tourist attractions and mine, the monitoring of cities and towns social security, road monitoring.
8 are total to the picture quality of cable monitoring broadcasting and TV level
Because the cable supervisory control system is modulated to 112.25～860MHz transmission to image from 0～6MHz by being total to the cable modulator altogether, has avoided common video interfering frequency, and the antijamming capability of system is greatly improved, guaranteed that image is interference-free in transmission course; Utilize high frequency carrier to come carrying signal, the carrier signal that when circuit transmits, only decays, picture signal can not decay, and brightness, colourity transmitting synchronous are nested.These have fundamentally improved the image transmission quality, have guaranteed that picture quality reaches national standard more than 4.5 grades.If a certain channel runs into interference in cable transmission altogether, promptly change a channel and just transmit and to solve, thereby have the flexibility of very strong initiative and system debug maintenance aspect anti-interference.
Claims (6)
1. a safety defense monitoring system is total to the cable transmission equipment, it is characterized in that: comprise at least one common cable modulator, at least one blender, at least one common cable demodulator and radio frequency coaxial-cable, an end of cable modulator correspondence connects supervising device altogether, the other end connects blender, a plurality of blenders connect cable demodulator altogether through same radio frequency coaxial-cable, and the cable demodulator connects DVR or PC altogether.
2. safety defense monitoring system according to claim 1 is the cable transmission equipment altogether, it is characterized in that: described cable modulator altogether comprises video input processing section, audio frequency input processing section and cradle head control signal output processing part branch, wherein, described video input processing section comprises carries out the clamp circuit that clamper is handled to vision signal, the video modulation circuit that is connected and vision signal is carried out the video modulation processing with clamp circuit, with be connected with the video modulation circuit and, obtain the rf modulated signal of video the low pass filter that vision signal is handled; Described audio frequency input processing section comprises the audio frequency amplifier that audio signal is carried out processing and amplifying, the audio frequency FM modulator that is connected and audio signal is carried out the FM modulation with audio frequency amplifier, be connected and audio signal carried out the audio modulating circuit of rf modulations with the FM modulator, be connected with audio modulating circuit and, obtain the rf modulated signal of audio frequency the low pass filter that audio signal is handled; The rf modulated signal of video and the rf modulated signal of audio frequency mix after radio frequency coaxial-cable inputs to common cable demodulator; Described cradle head control signal output processing part branch comprises the low pass filter that control signal is handled, the FSK demodulator that is connected and control signal is demodulated to the Transistor-Transistor Logic level signal with low pass filter, be connected with FSK demodulator and the Transistor-Transistor Logic level conversion of signals is become the level shifting circuit of RS485 signal, the signal after the conversion outputs on the The Cloud Terrace of monopod video camera.
3. safety defense monitoring system according to claim 1 and 2 is the cable transmission equipment altogether, it is characterized in that: described altogether cable demodulator receives the modulation signal that sends from cable modulator altogether, and comprises that video output processing part branch, audio frequency output processing part that the modulation signal of input is handled are divided and cradle head control signal input processing section; Wherein, described video output processing part branch comprises exchanges the low pass filter that the non-video carrier wave in the system signal filters, and is connected and carries out the video demodulator of video demodulator and output processing with low pass filter; Described audio frequency output processing part branch comprises exchanges the low pass filter that the non-audio carrier wave in the system signal filters, the audio demodulator that is connected and carries out the audio frequency demodulation with low pass filter is connected and audio signal is carried out the audio frequency amplifier of processing and amplifying with audio demodulator; Described cradle head control signal input processing section comprises the level shifting circuit that the RS485 conversion of signals in the modulation signal is become the Transistor-Transistor Logic level signal, the fsk modulator that is connected and the level signal after the conversion is carried out the frequency shift keying modulation with level shifting circuit, the low pass filter that is connected with fsk modulator and the signal after the modulation is handled, filtered signal is fed through common cable modulator through splitter.
4. safety defense monitoring system according to claim 1 is the cable transmission equipment altogether, and it is characterized in that: described supervising device comprises video camera, monitor and alarm.
5. safety defense monitoring system according to claim 4 is the cable transmission equipment altogether, it is characterized in that: described video camera respectively through video line and power line together the cable modulator be connected.
6. safety defense monitoring system according to claim 4 is the cable transmission equipment altogether, it is characterized in that: described monitor respectively through tone frequency channel wire and power line together the cable modulator be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010202036166U CN201830378U (en) | 2010-05-26 | 2010-05-26 | Co-cable transmission equipment of security monitoring system |
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| CN2010202036166U CN201830378U (en) | 2010-05-26 | 2010-05-26 | Co-cable transmission equipment of security monitoring system |
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| CN201830378U true CN201830378U (en) | 2011-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262978A (en) * | 2014-05-27 | 2016-01-20 | 上海核工程研究设计院 | Improved irradiation-resistant closed circuit television monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262978A (en) * | 2014-05-27 | 2016-01-20 | 上海核工程研究设计院 | Improved irradiation-resistant closed circuit television monitoring system |
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Granted publication date: 20110511 Termination date: 20120526 |