CN201409201Y - Common cable transmission system used for monitoring - Google Patents
Common cable transmission system used for monitoring Download PDFInfo
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- CN201409201Y CN201409201Y CN2009201377052U CN200920137705U CN201409201Y CN 201409201 Y CN201409201 Y CN 201409201Y CN 2009201377052 U CN2009201377052 U CN 2009201377052U CN 200920137705 U CN200920137705 U CN 200920137705U CN 201409201 Y CN201409201 Y CN 201409201Y
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Abstract
The utility model discloses a common cable transmission system used for monitoring, which is characterized in that the system comprises at least two modulators, at least one coupler, a demodulator anda radio frequency coaxial cable. One end of each modulator is respectively connected with a monitoring device in a one-one correspondence manner, and the other end thereof is inserted in the radio frequency coaxial cable; and the other end of the radio frequency coaxial cable enters terminal equipment via the demodulator. The monitoring system has the advantages of low manufacturing cost, good transmission effect, low transmission cost and wide application range.
Description
Technical field
The utility model relates to signal transmission system, the particularly a kind of common cable transmission system that can transmit multichannel monitor signal and control signal simultaneously.
Background technology
Along with the progress of science and technology and the raising of people's awareness of safety, a lot of now residential quarters, factories and miness, schools etc. all are equiped with supervisory control system, the position of supervising device and quantity are according to the sub-district, factories and miness, the area of school etc. and actual conditions and decide, and be provided with the control room at the property management center, all supervising devices all are connected communication with the control room, the signal that is monitored is sent to terminal equipment in the control room, operating personnel according to circumstances send control signal by the control room to all or indivedual supervising device simultaneously, thereby form an information network, become the sub-district, factories and miness, the supervisory control system of school etc.
In order to realize the communication transmission between supervising device and the control room, following several implementation is arranged at present:
(1) all be connected between control room and each supervising device by twisted-pair feeder, yet, use twisted-pair feeder to carry out communication, be that the signal that at first need is transmitted is encoded, transfer to the other side after, decode again, just can normally read, also promptly between control room and each supervising device, a cover coding/decoding apparatus need be set all, not only cause system huge, and cost height, the cost of manufacture height, and since on the twisted-pair feeder signal transmitting attenuation more serious, therefore and be not suitable for the telecommunication transmission;
(2) be connected by video coaxial cable respectively between control room and each supervising device, though saved coding/decoding apparatus like this, yet, and cause the high of cost of manufacture still owing between control room and each supervising device, need dispose a video coaxial cable respectively;
(3) another transmission means is to adopt popular now optical fiber, optical fiber is fast owing to transmission speed, capacity is big, reliability is high is widely used, yet, because the difficult access device that increases in the centre of optical fiber, make supervisory control system in a single day finish, change with regard to being difficult for again, cause access property poor, the scope of application is little.
In view of this, the design people studies improvement at the defective of the transmission system in the present monitoring, and this case produces thus.
The utility model content
Main purpose of the present utility model is to provide a kind of common cable transmission system that is used to monitor, and its cost of manufacture is low, and laser propagation effect is good, and it is low, applied widely to transmit cost.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of common cable transmission system that is used to monitor comprises at least two modulators, at least one coupler, a demodulator and a radio frequency coaxial-cable; One end of modulator connects one to one with supervising device respectively, and the other end inserts radio frequency coaxial-cable by coupler again, and the other end of radio frequency coaxial-cable enters terminal equipment via demodulator.
Above-mentioned demodulator and terminal equipment all are arranged in the control room.
Said modulator comprises that the frequency control circuit, modulation circuit, frequency bandwidth characteristics circuit and the harmonic wave that connect successively suppress circuit, first signal distribution circuit, signal selecting circuit, control signal demodulator circuit and interface conversion circuit; The signal that modulation circuit input monitoring device monitoring arrives, radio frequency coaxial-cable is sent into by first signal distribution circuit in the modulation back, and first signal distribution circuit receives the modulated control signal from radio frequency coaxial-cable simultaneously, sends into signal selecting circuit.
Above-mentioned demodulator comprises the secondary signal distributor circuit that is connected with radio frequency coaxial-cable, at least one the demodulation passage that connects the output of secondary signal distributor circuit, reaches the control signal modulation circuit that is connected with secondary signal distributor circuit input with the channel attached channel control circuit of each demodulation; Terminal equipment is sent into radio frequency coaxial-cable by control signal modulation circuit, secondary signal distributor circuit successively with control signal, and modulated monitor signal is reduced into the original signal that monitors via secondary signal distributor circuit, each demodulation passage demodulation and exports to terminal equipment simultaneously.
Above-mentioned control signal is 485 control data signal.
Above-mentioned terminal equipment comprises corresponding with each supervising device respectively monitor, connects with the output of corresponding each demodulation passage respectively.
Above-mentioned terminal equipment comprises supervisory keyboard, is connected with the control signal modulation circuit.
Above-mentioned terminal equipment also comprises a blender and a broadcast host, and demodulator all is connected with blender with broadcast host, and blender is connected to radio frequency coaxial-cable again; In addition, an audio amplifier also is connected with broadcast demodulator, and by a coupler be connected on the radio frequency coaxial-cable more arbitrarily.
After adopting such scheme, the utlity model has following advantage:
(1) technology maturation, stability height: the monitoring in the utility model cable transmission system altogether is based on the cable TV technology, the cable TV technology China use had two, 30 years historical, its stability and reliability are obvious to all, adopt the mode of cable bus altogether, the monitoring transmission system of points up to a hundred, only need several buses just can solve, reduced the cable node greatly, reduced the possibility that fault takes place;
(2) long transmission distance, picture quality height: reach several kilometers or when farther, picture signal is undistorted substantially in transmission range.If adopt the mode of two-way amplifier or the mode that optical fiber adds the cable combination, transmission range can reach tens kilometers.Guarantee that picture quality reaches national standard more than 4.5 grades;
(3) transmitted in both directions, compatible strong: the monitor signal of control signal and passback is transmitted in both directions in same cable, realizes the integration of many cover systems such as monitoring, background music, Cell Broadcast CB;
(4) big, the easily expansion of capacity: a radio frequency coaxial-cable can transmit 40 tunnel vision signals, 40 tunnel audio signals, 40 circuit-switched data control signals, 40 tunnel broadcasting or background musics at most simultaneously, the utility model adopts the structure of bus topology, when increasing the control point, only need nearby the signal line accessing system bus to be got final product, need not a large amount of secondary wirings;
(5) strong interference immunity: in supervisory control system, interference is video monitoring " natural enemy ", the video interference all is the low-frequency disturbance of 0～6MHz generally speaking, and common cable bus transmission model adopts the way of frequency translation, make signal transmission frequencies beyond interfering frequency, disturb so can effectively suppress low-frequency disturbance, forceful electric power, use, also can transmit high definition, real-time monitoring image even have in power plant, colliery etc. under the environment of strong interferers;
(6) simple, the cable utilance height of construction wiring :-5 common radio frequency coaxial-cables just can be used for transmitting up video/audio, descending control data signal, point-to-point transmission, also can carry out the connection of bus tree type, hub-and-spoke configuration, the synthetic bus of a plurality of points be carried out the transmission of image, control; Radio frequency coaxial-cable transmits the video/audio control signal, need not connect up in addition, has improved the cable utilance, and the trouble of avoiding various signal independent wiring to bring has simultaneously reduced project cost.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the structural representation of modulator in the utility model;
Fig. 3 is the structural representation of demodulator in the utility model.
Embodiment
Below in conjunction with drawings and the specific embodiments the utility model is elaborated.
Referring to figs. 1 to shown in Figure 3, a kind of applied supervisory control system of common cable transmission system that is used to monitor of the utility model, comprise at least two supervising devices 1 (present embodiment is an example with 16) and a terminal equipment, supervising device 1 is arranged on ground such as residential quarter, factories and miness, school, audio frequency or other monitor message are looked in collection, and terminal equipment is arranged in the control room 2, is used to show or play the content of monitor message.
And the utility model comprises at least two modulators 3, at least one coupler 4, a demodulator 5 and a radio frequency coaxial-cable 6, the number of modulator 3 is identical with supervising device 1, it is to concern one to one, and according to known technology as can be known, in network, have under the prerequisite of a supervising device 1, if insert another supervising device 1 again, just need be engaged between this supervising device 1 and the radio frequency coaxial-cable 6 and be connected a coupler 4, also be that the number of coupler 4 always lacks one than the sum of supervising device 1; During connection, supervising device 1, modulator 3 are connected successively with coupler 4, are linked in the contact of radio frequency coaxial-cable 6 by coupler 4 again; And the other end of radio frequency coaxial-cable 6 enters terminal equipment via demodulator 5, safeguards for convenience and use, in the present embodiment demodulator 5 also is arranged in the control room 2.
With reference to shown in Figure 2, each modulator 3 all adopts the CATV standard, comprises that the frequency control circuit 31, modulation circuit 32, frequency bandwidth characteristics circuit 33 and the harmonic wave that connect successively suppress circuit 34, first signal distribution circuit 35, signal selecting circuit 36, control signal demodulator circuit 37 and interface conversion circuit 38; Supervising device 1 output monitor signal (referring to video/audio signal at this) is given modulation circuit 32, vibration frequency by frequency control circuit 31 control modulation circuits 32, vision signal is carried out amplitude modulation, after audio signal is carried out the frequency modulation processing, the video/audio signal of different monitoring dress system point is modulated on the different channel, fully guarantee the residual sideband characteristic of signal again by frequency bandwidth characteristics circuit 33, suppress the interference between adjacent channel, harmonic wave suppresses circuit 34 and suppresses crosstalking between different channel, make transmission channel signals as much as possible on the line, by first signal distribution circuit 35 video/audio signal that modulates is sent into radio frequency coaxial-cable 6 again, first signal distribution circuit, 35 receptions simultaneously are from the modulated control signal of radio frequency coaxial-cable 6, send into signal selecting circuit 36 again, filter out the modulated control signal that control room 2 is sent here, be reduced into high-low level by corresponding demodulator circuit 37, convert the RS485 data level output of standard again through interface circuit to, supervising device 1 is controlled.
Terminal equipment is connected with radio frequency coaxial-cable 6 via demodulator 5, and in the present embodiment, terminal equipment includes supervisory keyboard 22 and the number monitor 21 corresponding with supervising device 1 number; Each monitor 21 is connected with secondary signal distributor circuit 51 via the demodulation passage 52 of correspondence respectively, and supervisory keyboard 22 is connected with control signal modulation circuit 54, and passes through supervisory keyboard 22 input of control commands by operating personnel, and carries out relevant operation.
In the utility model when work, please refer to shown in Figure 1ly again, and the video/audio signal that each supervising device 1 collects is converted to radiofrequency signal by modulator 3, the main line system that this signal constitutes by coupler 4 feed-in radio frequency coaxial-cables 6; Along radio frequency coaxial-cable 6, the signal that a plurality of supervising devices 1 collect is all changed back feed-in main line system in a like fashion, because the frequency difference of each modulator 3, so same radio frequency coaxial-cable 6 of these radiofrequency signal feed-ins but can not crosstalked mutually; Aforementioned radiofrequency signal is transferred to control room 2 along radio frequency coaxial-cable 6, be reduced into original video/audio signal by demodulator 5, show by monitor 21, simultaneously, what sent in control room 2 converts also feed-in coaxial cable 6 of radiofrequency signal to the RS485 data level signal of the front end supervising device 1 control control signal modulation circuit 54 by demodulator 5 inside, the interlock circuit of head-end modulator 3 receives and this radiofrequency signal of demodulation, export original control data level signal, drive supervising device 1 and carry out corresponding action.
In addition, present embodiment is integrating broadcast system like a cork also, in control room 2, also comprise a blender 23 and a broadcast host 24, demodulator 5 all is connected with blender 23 with broadcast host 24, and blender 23 is connected to coaxial cable 6 again, realizes broadcasting and pilot signal cable transmission altogether; In addition, native system also comprises an audio amplifier 7, a broadcast demodulator 8 and a coupler 9, and audio amplifier 7 is connected with broadcast demodulator 8, and is connected to radio frequency coaxial-cable 6 by coupler 9; During work, the voice signal that broadcast host 24 in the control room 2 will need to broadcast is modulated into radiofrequency signal, by blender 23 feed-in coaxial cables 6, both transmitted the control signal to supervising device 1 sent on the radio frequency coaxial-cable 6 this moment, transmitted broadcast singal again, on radio frequency coaxial-cable 6 more arbitrarily, coupler 9 takes out a part of signal and gives broadcast demodulator 8, broadcast demodulator 8 restores original voice signal, drives audio amplifier 7 and realizes broadcast capability.
In sum, a kind of common cable transmission system that is used to monitor of the utility model, focus on by adopting modulator 3 and demodulator 5, at first the video/audio signal of each supervising device 2 is sent into modulator 3, be modulated at different channels by Frequency And Amplitude Modulation respectively, transmit by a radio frequency coaxial-cable 6 again, because the channel difference of each road signal, therefore can't produce interference, make and on a line, can transmit channel as much as possible, significantly reduce the use amount of radio frequency coaxial-cable 6, reduce cost of manufacture, and different transmission channels has been avoided the influence of disturbing, and laser propagation effect is good; The utility model can be applicable in the supervisory control system that has two ends supervising device 1 and terminal equipment arbitrarily, realizes the transmitted in both directions of signal between the two, and the scope of application is wide, both can make sale separately, also can be equipped with supervisory control system and sell as a complete system.
Above embodiment only is explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every according to the technological thought that the utility model proposes, any change of being done on the technical scheme basis all falls within the utility model protection range.
Claims (8)
1, a kind of common cable transmission system that is used to monitor is characterized in that: comprise two modulators, at least one coupler, a demodulator and a radio frequency coaxial-cable at least; One end of modulator connects one to one with supervising device respectively, and the other end inserts radio frequency coaxial-cable by coupler again, and the other end of radio frequency coaxial-cable enters terminal equipment via demodulator.
2, a kind of common cable transmission system that is used to monitor as claimed in claim 1, it is characterized in that: described demodulator and terminal equipment all are arranged in the control room.
3, a kind of common cable transmission system that is used to monitor as claimed in claim 1 is characterized in that: described modulator comprises that the frequency control circuit, modulation circuit, frequency bandwidth characteristics circuit and the harmonic wave that connect successively suppress circuit, first signal distribution circuit, signal selecting circuit, control signal demodulator circuit and interface conversion circuit; The monitor signal of modulation circuit input monitoring device, radio frequency coaxial-cable is sent into by first signal distribution circuit in the modulation back, and first signal distribution circuit receives the modulated control signal from radio frequency coaxial-cable simultaneously, sends into signal selecting circuit.
4, a kind of common cable transmission system that is used to monitor as claimed in claim 1 is characterized in that: described demodulator comprises the secondary signal distributor circuit that is connected with radio frequency coaxial-cable, at least one the demodulation passage that connects the output of secondary signal distributor circuit, reaches the control signal modulation circuit that is connected with secondary signal distributor circuit input with the channel attached channel control circuit of each demodulation; Terminal equipment is sent into radio frequency coaxial-cable by control signal modulation circuit, secondary signal distributor circuit successively with control signal, and modulated monitor signal is reduced into original monitor signal and exports to terminal equipment via secondary signal distributor circuit, each demodulation passage demodulation simultaneously.
5, a kind of common cable transmission system that is used to monitor as claimed in claim 4, it is characterized in that: described terminal equipment comprises corresponding with each supervising device respectively monitor, connects with the output of corresponding each demodulation passage respectively.
6, a kind of common cable transmission system that is used to monitor shown in claim 4, it is characterized in that: described terminal equipment comprises supervisory keyboard, is connected with the control signal modulation circuit.
7, as claim 3 or 4 described a kind of common cable transmission systems that are used to monitor, it is characterized in that: described control signal is 485 control data signal.
8, a kind of common cable transmission system that is used to monitor as claimed in claim 1, it is characterized in that: described terminal equipment also comprises a blender and a broadcast host, demodulator all is connected with blender with broadcast host, and blender is connected to radio frequency coaxial-cable again; In addition, an audio amplifier also is connected with broadcast demodulator, and by a coupler be connected on the radio frequency coaxial-cable more arbitrarily.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201377052U CN201409201Y (en) | 2009-04-14 | 2009-04-14 | Common cable transmission system used for monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201377052U CN201409201Y (en) | 2009-04-14 | 2009-04-14 | Common cable transmission system used for monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201409201Y true CN201409201Y (en) | 2010-02-17 |
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ID=41680147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201377052U Expired - Fee Related CN201409201Y (en) | 2009-04-14 | 2009-04-14 | Common cable transmission system used for monitoring |
Country Status (1)
| Country | Link |
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| CN (1) | CN201409201Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724473A (en) * | 2012-06-18 | 2012-10-10 | 安徽秋田电子有限公司 | Two-wire multichannel signal superposition/separation system |
| CN104853079A (en) * | 2013-09-11 | 2015-08-19 | 俞尚均 | Signal processing method based on multichannel coaxial visual control, and device thereof |
-
2009
- 2009-04-14 CN CN2009201377052U patent/CN201409201Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724473A (en) * | 2012-06-18 | 2012-10-10 | 安徽秋田电子有限公司 | Two-wire multichannel signal superposition/separation system |
| CN104853079A (en) * | 2013-09-11 | 2015-08-19 | 俞尚均 | Signal processing method based on multichannel coaxial visual control, and device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100217 Termination date: 20170414 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |