CN2673008Y - Fixed point monitor for radio frequency transmission - Google Patents
Fixed point monitor for radio frequency transmission Download PDFInfo
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- CN2673008Y CN2673008Y CN 200320131378 CN200320131378U CN2673008Y CN 2673008 Y CN2673008 Y CN 2673008Y CN 200320131378 CN200320131378 CN 200320131378 CN 200320131378 U CN200320131378 U CN 200320131378U CN 2673008 Y CN2673008 Y CN 2673008Y
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- radio frequency
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Abstract
Disclosed is a fixed point monitor for radio frequency transmission device that is capable of switching over in multipath and mainly solves the problems that the monitoring path number is finite and the cost of facilities is high in existing monitoring techniques. The utility model is characterized in that the audio signal output end and the video signal output end of a camera are respectively connected to the audio signal input end of an audio signal gate (30) and the video signal input end of a video signal gate (31). The audio signal output end of the audio signal gate (30) is connected to the audio signal input end of a radio frequency modulator (50) through capacitance coupling and the video signal output end of the video signal gate (31) is connected to the video signal input end of the radio frequency modulator (50) through capacitance coupling. In addition, the radio frequency signal output end of the radio frequency modulator (50) is connected to the radio frequency signal input end of a monitor with a radio frequency demodulator through a coaxial cable. The utility model is characterized in that it has many monitoring points and the cost of facilities is low.
Description
Technical field:
The utility model relates to a kind of supervising device, particularly a kind of radio frequency transmission fixed point supervising device that can carry out the multichannel switching.
Background technology:
The type of electronic monitoring device mainly contains multichannel audio-video frequency switching monitoring system, multichannel audio-video frequency matrix switching monitoring system, rf modulations duplex monitoring system at present, wherein multichannel audio-video frequency switching monitoring system is present supervisory control system on a small scale a kind of mode commonly used, whole system is by multiple cameras, an AV switch, a monitor, compositions such as video recorder and a cover The Cloud Terrace one lens controller, can monitor the multichannel scene, but its way is subjected to the restriction of audiovideo switcher, can reach 16 the tunnel at most at present; Multichannel audio-video frequency matrix switching monitoring system changes the multichannel audio-video frequency switch into matrix switcher, great advantage is that the control way is many, can reach 4096 the tunnel at most at present, but when multichannel, because every road 4 lines of minimum needs are power line, control line, tone frequency channel wire, video line, make whole system cabling complexity, problems such as interference, decay are outstanding, and project cost is huge, and non-general unit can afford; The rf modulations duplex monitoring system is that the audio frequency of video camera, vision signal are modulated into radiofrequency signal, mixing the back by blender is transmitted by coaxial cable, but it is limited to use this kind method control way, in the 470MHz closed-circuit system, can transmit 50 road signals in theory with adjacent frequency method, if adopt every frequency method, can only transmit 25 the tunnel at most, in the 850MHz system, can transmit 93 the tunnel at most with adjacent frequency method.In the 470MHz system, generally also just use low-frequency range, promptly at channel 1 to channel 12, add again and augment 1 to augmenting 7 totally 19 channels, that is to say, can transmit 19 road signals at most with adjacent frequency method.If adopt defeatedly, then can transmit 10 road signals at most every keeping pouring in.This kind system great advantage is under the situation of the monitoring scene of same quantity, project cost is low, cabling is few, transmission line is long, maintenance is simple, adopt the monitor of radio-frequency (RF) demodulator or band full range receiving function to watch at receiving terminal, do not need special equipment.
In order to overcome the deficiency that the monitoring way is limited, equipment cost is high that exists in the existing monitoring technique, the utility model provides a kind of can carry out the radio frequency transmission fixed point supervising device that multichannel is switched, and this kind radio frequency transmission fixed point supervising device has the characteristics many, that equipment cost is low of counting of monitoring.The technical solution of the utility model is: this kind radio frequency transmission fixed point supervising device, comprise video camera, the audio signal gate, the vision signal gate, double audio coding device with output, double audio decoder with input, radio-frequency modulator, the monitor that has radio-frequency (RF) demodulator, it is characterized in that: the audio signal output end of video camera, VT is connected to the audio signal input end of audio signal gate respectively, the video signal input terminal of vision signal gate, the audio signal output end of audio signal gate is through being capacitively coupled to the audio signal input end of radio-frequency modulator, the VT of vision signal gate is through being capacitively coupled to the video signal input terminal of radio-frequency modulator, the radiofrequency signal output of radio-frequency modulator is connected to the radio-frequency (RF) signal input end of the monitor that has radio-frequency (RF) demodulator through coaxial cable, the output of double audio coding device is through being capacitively coupled to the input of double audio decoder, and the address code of audio signal gate latchs end and the address code of vision signal gate and latchs and hold the address code output that is connected to double audio decoder after in parallel.
Wherein, the quantitative range of video camera can be between 1～1488 the tunnel.
The utlity model has following beneficial effect: the utility model has utilized the video switch technology, solves the interference problem that radio frequency switches, and adopts remote control thereof that the video conversion portion is placed on front end, thereby guarantees the signal to noise ratio of signal; This system is no matter front end has several control points, and a radio frequency line is all used in the transmission of signal, and wiring is simplified greatly, and the monitoring way is many more, and effect is obvious more; This system has very high cost performance, be particularly suitable for monitoring a lot of occasion of counting, it is a lot of that construction cost is reduced, and the monitoring way is many more, effect is obvious more, according to present design, monitor at most on this Systems Theory and count and can reach 1488 the tunnel, can satisfy the demand of various occasions fully.If improve the remote control switched system, monitoring is counted and can also be increased; The pilot signal transmission range is long, amplifies without relaying promptly to reach 500 to 1000 meters, if amplify with relaying, transmission range then can be farther, and this is that present most of supervisory control system institute is inaccessible.
Description of drawings:
Accompanying drawing 2 is the utility model double-tone decoding circuit and audio frequency and video gating circuit schematic diagrams frequently;
Accompanying drawing 3 is the utility model audio coding, button indicating circuit supply module schematic diagram;
Accompanying drawing 4 is the decoding frequently of the utility model double-tone and sound, video gating circuit supply module principle figure.
Embodiment:
The utility model is described in further detail below in conjunction with accompanying drawing:
Design principle of the present utility model is sound, the vision signal with the output of several video camera, delivering to 16 selects in the 1 audio frequency and video commutation circuit, road delivering to radio-frequency modulator and be modulated into the signal of corresponding channel as one group of signal wherein selected in the instruction of sending according to the double audio coding device, minimum 1 of this channel number, can reach 80 at most, after the blender signal mixing different with other group channel, deliver to Control Room with a radio frequency line, deliver to demodulator by distributor again and be reduced into audio-video signal and deliver to monitor and monitor and to watch.
Be one below and use object lesson of the present utility model, as shown in Figure 1, double audio coding integrated circuit modules IC
1With quartz crystal oscillator XT
1, resistance R
1, resistance R
2, capacitor C
1, triode T
1And resistance R
3Form double audio coding device 40, double audio coding integrated circuit modules IC
1Select MT5087 for use, double audio coding integrated circuit modules IC
1Pin two, 3,4,5 and pin one 1,12,13,14 pin form 4 * 4 keyboards, when any crosspoint is connected, double audio coding integrated circuit modules IC
1Just there is the double audio coding of a correspondence to export, through resistance R from 16 pin
1, R
2And capacitor C
1Deliver to triode T
1And resistance R
3The amplifying circuit of forming amplifies, capacitor C
1Act as stopping direct current, pass through coupling capacitance C behind the double audio coding signal process output 4a after the amplification
2Deliver to the input 4b of double audio decoder 41, another road is through capacitor C
3Deliver to by resistance R
4, R
5, R
6, quartz crystal oscillator XT
2, double-tone decoder ic module I C frequently
2The double-tone of forming decoding circuit is frequently deciphered, and double-tone is decoder ic module I C frequently
2Select the MT8870 decoder for use, its double-tone frequency dtmf signal with 16 group codings converts the tetrad signal to, and the binary signal after the decoding is by double-tone frequency decoder ic module I C
214,13,12,11 pin deliver to by 4-16 line decoder IC
3, light-emitting diode D
1To D
16, resistance R
7The indicating circuit of forming carries out four lines---the conversion of 16 lines, 4-16 line decoder IC
3Select CD4015 for use, it is driven for emitting lights diode D as a result
1--D
16Totally 16 lumination of light emitting diode, its luminous position and double audio coding integrated circuit modules IC
14 * 4 keyboards corresponding, indication correspondent button position.
As shown in Figure 3, power module is by protective tube, transformer, rectifier bridge, filter capacitor C
12, C
13, C
14, C
15And circuit of three-terminal voltage-stabilizing integrated IC
4Form circuit of three-terminal voltage-stabilizing integrated IC
4Select 78M05 for use, transformer is reduced to 10 volts of low-voltage ACs with 220 volts of alternating currents, through rectifier bridge rectification, filter capacitor C
12, C
13After the filtering unstable direct current, again by circuit of three-terminal voltage-stabilizing integrated IC
4Voltage stabilizing is after filter capacitor C
14, C
15Output is stablized 5 volts of direct currents for double audio coding device 40 and the use of key position indicating circuit after the filtering.
As shown in Figure 2, the audio signal output end of video camera, VT is connected to the audio signal input end of audio signal gate 30 respectively, the video signal input terminal of vision signal gate 31, the audio signal output end of audio signal gate 30 is through being capacitively coupled to the audio signal input end of radio-frequency modulator 50, the VT of vision signal gate 31 is through being capacitively coupled to the video signal input terminal of radio-frequency modulator 50, the radiofrequency signal output of radio-frequency modulator 50 is connected to the radio-frequency (RF) signal input end of the monitor that has radio-frequency (RF) demodulator through coaxial cable, the output 4a of double audio coding device 40 is through being capacitively coupled to the input 4b of double audio decoder 41, and the address code of audio signal gate 30 latchs end and the address code of vision signal gate 31 and latchs and hold the address code output that is connected to double audio decoder 41 after in parallel.
By double-tone frequency decoder ic module I C
6And quartz crystal oscillator XT
2, resistance R
9, R
10, R
8, capacitor C
7Form double audio decoder 41, double-tone is decoder ic module I C frequently
6Can select the MT8870 decoder for use, by the output 4a of double audio coding device 40 output through capacitor C
2The DTMF double audio coding signal of input 4b that is coupled to double audio decoder 41 is through resistance R
10, R
9Deliver to double-tone decoder ic module I C frequently
6Carry out the DTMF double-tone and decipher frequently, become the tetrad address code signal through double-tone frequency decoder ic module I C 16 dtmf code conversion of signals
611,12,13, No. 14 pins address code of delivering to vision signal gate 31 and audio signal gate 30 latch end, audio signal gate 30 and vision signal gate 31 select 1 analog switch module I C by two CD4067 types 16
4And IC
5Constitute module I C
4Be audio signal gating commutation circuit, 16 tunnel audio signals are from module I C
49,8,7,6,5,4,3,2,23,22,21,20,19,18,17,16 pin send into.After being selected by inner 16 addresses of selecting 1 switching circuit to latch end according to its address code, promptly its pin one 3,14,11,10 receives by double-tone decoder ic module I C frequently
6The tetrad signal of delivering to.Through module I C
4Road audio signal behind the gating is sent by 1 pin, delivers among the radio-frequency modulator 1CH through the C5 coupling; Module I C
5Be the vision signal commutation circuit, operation principle and module I C
4Identical, because of having identical address code, the two make vision signal behind the gating and audio signal from same video camera, in like manner the vision signal behind the gating is in capacitor C 6 is delivered to radio-frequency modulator 1CH.Radio-frequency modulator adopts finished product, and model can be Xi'an and steps gram MIC--9901, and operation principle can be referring to its technical manual.After sound, vision signal are modulated into radiofrequency signal, deliver in the display that has radio-frequency (RF) demodulator through radio frequency cable and can be reduced into sound, image.
As shown in Figure 4, the power module in this group circuit is by protective tube, transformer, rectifier bridge, filter capacitor C
9, C
10, C
11And three ends surely become voltage stabilizing circuit IC
7, IC
8Form IC
7, IC
8Select 7812 and 78M05 type integrated package respectively for use.220 volts of alternating currents are reduced to 15 volts of low-voltage ACs after rectifier bridge rectification, capacitor C through transformer
9Deliver to IC after the filtering
412 volts of voltage stabilizing outputs are used for sound, video gating device 30,31 and radio-frequency modulator 1CH.
The design philosophy of technical scheme described in the utility model is the characteristics of the existing various supervisory control systems of analysis-by-synthesis, fully adopt the strong point of existing electronic monitoring and control system, adopt mature technology to propose the design of " the multichannel televideo switches frequently, radio frequency transmission one line is entered house ", its basic thought can be summarized as:
At front end, the audio-video signal of video camera is delivered to audio frequency and video commutation circuit in the audio frequency and video gate, after the keyboard selection, deliver to radio-frequency modulator again and be modulated into radiofrequency signal, be transferred in the Control Room with a radio frequency line, be reduced into corresponding audio-video signal by radio demodulating equipment again and deliver to the monitor demonstration.If in a system, sound, video gating device can switch N video camera, radio-frequency modulator can be modulated M radiofrequency signal, count (way) that then this system can monitor is N * M, and the circuit of transmission only needs one, do like this and solved the deficiency of utilizing the AV conversion in the prior art separately and utilizing the radio frequency conversion to exist separately, according to present design, monitor at most on this Systems Theory and count and to reach 1488 the tunnel, can satisfy the demand of various occasions fully, if improve the remote control switched system, monitoring is counted and can also be increased.The utility model has utilized the video switch technology, solves the interference problem that radio frequency switches, and adopts remote control thereof that the video conversion portion is placed on front end, thereby guarantees the signal to noise ratio of signal; This system is no matter front end has several control points, and a radio frequency line is all used in the transmission of signal, and wiring is simplified greatly, and the monitoring way is many more, and effect is obvious more; This system has very high cost performance, be particularly suitable for monitoring a lot of occasion of counting, it is a lot of that construction cost is reduced, and the monitoring way is many more, effect is obvious more, according to present design, monitor at most on this Systems Theory and count and can reach 1488 the tunnel, can satisfy the demand of various occasions fully.If improve the remote control switched system, monitoring is counted and can also be increased; The pilot signal transmission range is long, amplifies without relaying promptly to reach 500 to 1000 meters, if amplify with relaying, transmission range then can be farther, and this is that present most of supervisory control system institute is inaccessible
Concrete contrast effect is stated the table of comparisons as follows:
| Used capital equipment and calculation price (thousand yuan) | The Av matrix switch system | The | ||||||||||
| 16 the tunnel | 32 the tunnel | 64 the | 16 the tunnel | 32 the tunnel | 64 the tunnel | |||||||
| Quantity | The amount of money | Quantity | The amount of money | Quantity | The amount of money | Quantity | The amount of money | Quantity | The amount of money | Quantity | The amount of money | |
| Colour TV camera (1.5) | 16 | 24 | 32 | 48 | 64 | 96 | 16 | 24 | 32 | 48 | 64 | 96 |
| The audio and | 1 | 19 | 1 | 35 | 1 | 64 | ||||||
| Colour monitor (2) | 2 | 4 | 4 | 8 | 4 | 8 | 1 | 2 | 2 | 4 | 4 | 8 |
| DVR (30) | ||||||||||||
| Every group 2.5 on AV line (is example with 500 meters) | 16 | 40 | 32 | 80 | 64 | 16 0 | ||||||
| Every group 0.05 on AV line (is example with 10 meters) | 16 | 0.8 | 32 | 1.6 | 64 | 3.2 | ||||||
| Remote control audio frequency and video/radio frequency converter (3) | 1 | 3 | 2 | 6 | 4 | 12 | ||||||
| Every group 0.75 of radio frequency line (is example with 500 meters) | 1 | 0.7 5 | 1 | 0.7 5 | 1 | 0.7 5 | ||||||
| Remote control transmitter (2) | 1 | 2 | 1 | 2 | 1 | 2 | ||||||
| Other auxiliary device | ||||||||||||
| Expense | 87 | 17 | 32 | 32. | 63. | 122 |
Claims (2)
1, a kind of radio frequency transmission fixed point supervising device, comprise video camera, audio signal gate (30), vision signal gate (31), double audio coding device (40) with output (4a), double audio decoder (41) with input (4b), radio-frequency modulator (50), the monitor that has radio-frequency (RF) demodulator, it is characterized in that: the audio signal output end of video camera, VT is connected to the audio signal input end of audio signal gate (30) respectively, the video signal input terminal of vision signal gate (31), the audio signal output end of audio signal gate (30) is through being capacitively coupled to the audio signal input end of radio-frequency modulator (50), the VT of vision signal gate (31) is through being capacitively coupled to the video signal input terminal of radio-frequency modulator (50), the radiofrequency signal output of radio-frequency modulator (50) is connected to the radio-frequency (RF) signal input end of the monitor that has radio-frequency (RF) demodulator through coaxial cable, latch the input (4b) of the output (4a) of double audio coding device (40) through being capacitively coupled to double audio decoder (41), the address code of audio signal gate (30) end and the address code of vision signal gate (31) latch holds the address code output that is connected to double audio decoder (41) after in parallel.
2, a kind of radio frequency transmission fixed point supervising device according to claim 1, it is characterized in that: the quantitative range of video camera is between 1～1488 the tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320131378 CN2673008Y (en) | 2003-12-29 | 2003-12-29 | Fixed point monitor for radio frequency transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320131378 CN2673008Y (en) | 2003-12-29 | 2003-12-29 | Fixed point monitor for radio frequency transmission |
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| Publication Number | Publication Date |
|---|---|
| CN2673008Y true CN2673008Y (en) | 2005-01-19 |
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ID=34477465
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320131378 Expired - Fee Related CN2673008Y (en) | 2003-12-29 | 2003-12-29 | Fixed point monitor for radio frequency transmission |
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| Country | Link |
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| CN (1) | CN2673008Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100421470C (en) * | 2005-05-26 | 2008-09-24 | 北京中天技源电子科技有限公司 | Acoustic-video multi-way restoring device for monitoring trade |
-
2003
- 2003-12-29 CN CN 200320131378 patent/CN2673008Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100421470C (en) * | 2005-05-26 | 2008-09-24 | 北京中天技源电子科技有限公司 | Acoustic-video multi-way restoring device for monitoring trade |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |