CN2691170Y - Two-way multimedia signal transmission device - Google Patents
Two-way multimedia signal transmission device Download PDFInfo
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- CN2691170Y CN2691170Y CNU2004200009440U CN200420000944U CN2691170Y CN 2691170 Y CN2691170 Y CN 2691170Y CN U2004200009440 U CNU2004200009440 U CN U2004200009440U CN 200420000944 U CN200420000944 U CN 200420000944U CN 2691170 Y CN2691170 Y CN 2691170Y
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Abstract
The utility model relates to a two-way multimedia signal transmission device belonging to the technical field of transmission device of audio-video signal and digital signal, comprising a transmitter and a receiver connected by video transmission cable. The transmitter comprises amplitude adjustment circuits, modulation circuits, four-stage amplifiers and shaping filtering circuits connected to the first input signal successively, the shooting and following driving circuits connected with the second input signal, the mixers and stabilized DC power providing power to each device. The receiver comprises a signal output circuit composed of band-pass filters, regulating circuits, shooting and following driving circuits and the other signal output circuit which comprises shooting and following driving circuits. The utility model has the advantage of far transmission distance, easy wire laying, low price, high quality of transmission, anti-jamming, and can transmit different signals in one cable.
Description
Technical field the utility model belongs to the transmission equipment technical field of audio-video signal, digital signal.Be meant especially under situation cheaply, use in the video transmission cable, long-distance transmissions audio-video signal and digital signal, and can in a video transmission cable, transmit the transmission equipment of two kinds of unlike signals.
Background technology is along with development economic and society, and many new technology constantly are applied to the monitoring field.Aspect transmission, the use of optical fiber and optical transceiver not only makes remote monitor become possibility, and makes the delivery quality of monitoring image and pilot signal obtain the lifting of matter.Undoubtedly, several kilometers to the application of up to a hundred kilometers levels, optical transceiver is the optimal selection of transmission equipment.But, about 1KM in, during remote monitor uses, most occasion people still have to use traditional video cables transmission means, reason is that optical fiber and optical transceiver seem that for the supervisory control system of this distance cost is too high.And traditional video cables transmission means in, can only transmit a kind of signal by the single line cable when remote directly audio/video signal transmission and digital signal, and because high fdrequency component is lost too much, cause signal quality obviously to descend, aspect anti-interference, also be difficult to satisfy designing requirement, therefore, audio-video signal about 1KM and digital data transmission become a big bottleneck in monitoring field.
The summary of the invention the purpose of this utility model is in order to overcome the above problems, design a kind of two-way multi-media signal transmitting device, have long transmission distance, wiring is easy, cheap, transmission quality is high, strong interference immunity, and can on the single line cable, transmit the characteristics of two kinds of different signals, be applicable to the supervisory control system of all trades and professions.
A kind of two-way multi-media signal transmitting device of the utility model design, it is characterized in that, it comprises transmitter and the receiver that adopts the video transmission cable to link to each other, this transmitter comprises: amplitude adjusting circuit, modulation circuit, the level Four amplifier that links to each other successively with first via input signal and be connected plastic filter circuit between second, third grade amplifier, with penetrating that the second road input signal links to each other with drive circuit, and blender and be the D.C. regulated power supply of each device power supply; This fourth stage amplifier out links to each other with the input of blender, and this output of penetrating with drive circuit links to each other with the input of blender, and the output of blender links to each other with the video transmission cable; This receiver comprises: by the band pass filter, the demodulator circuit that link to each other successively, penetrate the road signal output apparatus of forming with drive circuit 1; By penetrating another road signal output apparatus of forming with drive circuit 2, and be the D.C. regulated power supply of each device power supply; The input of this band pass filter all links to each other with the video transmission cable with the input of penetrating with drive circuit 2.
Main feature of the present utility model:
A. the applicable signal with interference signal high fields institutes such as elevators, factory, road, transformer station of this device transmits.B. this device circuit integrated level height, transmitter and receiver volume are little, can make things convenient for using and installing of client.C. this device has advantages such as long transmission distance, failure rate be low.D. antijamming capability is strong; Can effectively resist interference signals such as automobile spark plug, forceful electric power cable, radio band.E. this device can transmit the high definition coloured image, and can 24 continuous throughout the twenty-four hour24s.F. adopt standard BNC video interface, can connect video camera and carry out long-distance transmissions.Use the SYWV75 cable can transmit 2KM farthest when G. not adding amplifier.
Owing to adopted above-mentioned technical solution, make the utility model fast, reached long transmission distance on the basis of reliable, low price, wiring is easy, cheap, transmission quality is high, the purpose of strong interference immunity, and can transmit two kinds of different signals on the single line cable.
Description of drawings
Fig. 1 is a general structure block diagram of the present utility model.
Fig. 2 is that transmitter embodiment of the present utility model forms block diagram.
Fig. 3 is that receiver embodiment of the present utility model forms block diagram.
Embodiment is further described the utility model below in conjunction with embodiment and accompanying drawing.
General structure of the present utility model as shown in Figure 1, it comprises transmitter and the receiver that adopts the video transmission cable to link to each other, wherein transmitter receives the multi-media signal (as audio signal, vision signal, digital signal or the like) in two-way unlike signal source 1,2 simultaneously, and road signal is wherein modulated again mix the back and be transferred to receiver by the video transmission cable; Receiver obtains the two paths of signals that transmitter transmits, and wherein modulation signal is carried out demodulation be reduced to original two paths of signals source output signal 1,2, is sent on the various device respectively again.
The structure of the utility model transmitter as shown in Figure 2, comprise amplitude adjusting circuit, modulation circuit, the level Four amplifying circuit that links to each other successively with input signal 1 and be connected plastic filter circuit between second, third grade amplifying circuit, with penetrating that input signal 2 links to each other with drive circuit, and blender and be the D.C. regulated power supply of each device power supply; This fourth stage amplifier out links to each other with the input of blender, and this output of penetrating with drive circuit links to each other with the input of blender, and the output of blender links to each other with the video transmission cable by accessory power outlet.
The embodiment that the function of the utility model transmitter and each device adopt is respectively described below:
Multimedia input signal 1 is by the voltage amplitude of amplitude adjusting circuit control multi-media signal.Because the multi-media signal of input so voltage amplitude is discrepant, obtains unified voltage amplitude in order to guarantee modulation circuit from various signal sources, the amplitude adjusting circuit of present embodiment has adopted potentiometer to adjust mode.
Adjusted multi-media signal enters modulation circuit (present embodiment adopts 8637) and carries out the 38MHz modulation, produces the radiofrequency signal that carrier frequency is 38MHz by modulating the back.Modulation circuit (8637) has adopted the use circuit of integrated circuit manufacturer's recommended.
After the 38MHz radiofrequency signal is passed through first order amplifying circuit and second level amplifying circuit, the 38MHz radiofrequency signal of amplifying is sent into plastic filter circuit.The level Four amplifying circuit embodiment of this transmitter has all adopted the transistor intermediate frequency amplifier circuit, and transistorized model is 3355.
Plastic filter circuit embodiment has adopted SAW (Surface Acoustic Wave) filter, and the 38MHz radiofrequency signal of amplifying is carried out shaping filter, and unwanted unwanted signal and interference signal are got rid of.38MHz radiofrequency signal behind the shaping filter is amplified into blender by third level amplifying circuit and fourth stage amplifying circuit.
Because the 38MHz radiofrequency signal of amplifying and the frequency distance very big (frequency of multi-media signal is between 0～6.5MHz) of multi-media signal get final product so multi-media signal mixes by resistance with the 38MHz radiofrequency signal of amplification.
Multimedia input signal 2 is directly penetrated with the 38MHz radiofrequency signal mixing back that enters blender behind the drive circuit and amplify by one-level and is sent into the video transmission cable by accessory power outlet.
Power supply employing+12V direct voltage the input of transmitter is level Four amplifying circuit and drive circuitry, and produces one+5V voltage by voltage-stabilizing device (7805), is integrated circuit (8637) power supply.
Power supply indicator is that a resistance is connected with light-emitting diode, adds+luminous behind the 5V voltage.
Receiver architecture of the present utility model as shown in Figure 3, it comprises: by the band pass filter, the demodulator circuit that link to each other successively, penetrate a road (signal 1) output circuit of forming with drive circuit 1 and accessory power outlet 1; By penetrating another road (signal 2) output circuit of forming with drive circuit 2 and accessory power outlet 2, and be the D.C. regulated power supply of each device power supply; Wherein, the input of band pass filter all links to each other with the video transmission cable with the input of penetrating with drive circuit 2.This receiver also can comprise the testing circuit that is made of comparison amplifier that links to each other with demodulator circuit.
The embodiment that the function of the utility model receiver and each device adopt is respectively described below:
The receiver input obtains multi-media signal from the video transmission cable and the 38MHz radiofrequency signal is divided into two-way.
The first via is carried out shaping filter by band pass filter (38MHz), and multi-media signal and useless interference signal are filtered out, and sends into demodulator circuit then.Present embodiment adopts 9800 demodulator circuits, and band pass filter (38MHz) adopts the LC filter, and bandwidth is 8MHz, and band is outer to be suppressed for about 30dB.
Demodulator circuit (9800) is the intermediate frequency demodulation integrated package, and it carries out demodulation to the 38MHz radiofrequency signal, and the multi-media signal in the 38MHz radiofrequency signal is restored becomes multi-media signal, sends into then and penetrates with drive circuit.Because demodulator circuit (9800) cost is lower, and technology maturation, the multi-media signal that restores is very little with modulation multi-media signal gap in the past, so can satisfy the requirement of actual use fully.
For useful life that guarantees demodulator circuit (9800) and the load capacity of strengthening receiver, this receiver has designed two altogether and has penetrated with drive circuit, is respectively two different multi-media signals and drives.
The multi-media signal of the first via is delivered to accessory power outlet multi-media signal 1 is provided after penetrating with drive circuit 1.
The second road multi-media signal is directly delivered to penetrate with drive circuit 2 backs provides multi-media signal 2 by accessory power outlet.
The testing circuit of present embodiment adopts comparison amplifier (358), and purpose is that whether AFC voltage correct in the monitoring demodulator circuit (9800), if AFC voltage between 2.5V～3V, power supply indicator is luminous, expression AFC voltage is correct.
Power supply employing+the 9V of this receiver～+ input of 12V direct voltage, produce one+5V voltage by voltage-stabilizing device (7805), be integrated circuit (9800), (358) and drive circuitry.
Power supply indicator adopts a resistance to connect with light-emitting diode, adds+luminous behind the 5V voltage.
The technical parameter of the transmitter of present embodiment:
1). multi-media signal incoming level scope: 0.5-2Vp-p.
2). multi-media signal input impedance: 75 Ω.
3). cable output impedance: 75 Ω.
4). cable Maximum Output Level: 〉=115dB.
5). multi-media signal input socket: BNC seat.
6). cable accessory power outlet: BNC seat.
7). input voltage: DC power supply+12V.
8). maximum power dissipation :≤1.5W.
9). operational environment: 0 ℃ to 40 ℃ of temperature.
10). overall dimension: 100 * 27 * 52.
The technical parameter of receiver:
1). cable incoming level scope: 85-95dB.
2). multi-media signal output impedance: 75 Ω.
3). cable input socket: BNC seat.
4). multi-media signal accessory power outlet: BNC seat.
5). input voltage: DC power supply+12V.
6). maximum power dissipation :≤1.5W.
7). operational environment: 0 ℃ to 40 ℃ of temperature.
8). overall dimension: 100 * 27 * 52.
Claims (3)
1, a kind of two-way multi-media signal transmitting device, it is characterized in that, it is made up of the transmitter and the receiver that link to each other with the video transmission cable, this transmitter comprises: amplitude adjusting circuit, modulation circuit, the level Four amplifying circuit that links to each other successively with first via input signal and be connected plastic filter circuit between second, third grade amplifying circuit, with penetrating that the second road input signal links to each other with drive circuit, and blender and be the D.C. regulated power supply of each circuit supply; This fourth stage amplification circuit output end links to each other with the input of blender, and this output of penetrating with drive circuit links to each other with the input of blender, and the output of blender links to each other with the video transmission cable; This receiver comprises: by the band pass filter, the demodulator circuit that link to each other successively, penetrate the road signal output apparatus of forming with drive circuit (1); By penetrating another road signal output apparatus of forming with drive circuit (2), and be the D.C. regulated power supply of each circuit supply; The input of this band pass filter all links to each other with the video transmission cable with the input of penetrating with drive circuit (2).
2, two-way multi-media signal transmitting device as claimed in claim 1 is characterized in that, described receiver also comprises the testing circuit that is made of comparison amplifier that links to each other with demodulator circuit.
3, two-way multi-media signal transmitting device as claimed in claim 1 is characterized in that, described D.C. regulated power supply is made up of DC power supply, power supply stabilization circuit and the power supply indicator of+9V--+12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200009440U CN2691170Y (en) | 2004-01-09 | 2004-01-09 | Two-way multimedia signal transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200009440U CN2691170Y (en) | 2004-01-09 | 2004-01-09 | Two-way multimedia signal transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2691170Y true CN2691170Y (en) | 2005-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004200009440U Expired - Fee Related CN2691170Y (en) | 2004-01-09 | 2004-01-09 | Two-way multimedia signal transmission device |
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| Country | Link |
|---|---|
| CN (1) | CN2691170Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461087C (en) * | 2006-04-13 | 2009-02-11 | 建碁股份有限公司 | Computer system possessing analog digital video output, host and video transmission device |
-
2004
- 2004-01-09 CN CNU2004200009440U patent/CN2691170Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461087C (en) * | 2006-04-13 | 2009-02-11 | 建碁股份有限公司 | Computer system possessing analog digital video output, host and video transmission device |
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| Date | Code | Title | Description |
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| 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 |