CN212305487U - Circuit for converting multi-signal analog to digital based on network cable transmission - Google Patents
Circuit for converting multi-signal analog to digital based on network cable transmission Download PDFInfo
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- CN212305487U CN212305487U CN202020515370.XU CN202020515370U CN212305487U CN 212305487 U CN212305487 U CN 212305487U CN 202020515370 U CN202020515370 U CN 202020515370U CN 212305487 U CN212305487 U CN 212305487U
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Abstract
The utility model relates to a circuit based on many signal analog of net twine transmission changes digit, the circuit mainly includes: the system comprises a sending end network cable interface, a power supply monitoring circuit connected with the sending end network cable interface and a rear end modulation conversion circuit; the system comprises a receiving end network cable interface, an isolation power circuit, a protocol circuit and a front end modulation conversion circuit, wherein the isolation power circuit, the protocol circuit and the front end modulation conversion circuit are connected with the receiving end network cable interface; and the network cable is connected with the network cable interface of the sending end and the network cable interface of the receiving end, the network cable is mainly used for connecting a power supply monitoring circuit, a power supply circuit for isolating the power supply circuit and a protocol circuit, and a signal circuit for connecting a rear-end modulation conversion circuit and a front-end modulation conversion circuit, and the power supply circuit and the signal circuit are different groups of twisted-pair lines in the same network cable. The network cable-based long-distance transmission circuit for converting various analog signals into digital signals has the characteristics of convenience in wiring, simplicity in operation, no video disconnection, no blockage, no delay and safety in use.
Description
Technical Field
The utility model relates to a video monitoring equipment field especially relates to a circuit based on net twine transmission multi-signal analog changes digit.
Background
A circuit for converting multiple signal analog to digital based on network cable transmission is used for simultaneously transmitting audio signals, digital video signals, coaxial control signals and power signals in one network cable. The technology is used for engineering wiring, so that the cost is low, the installation is convenient, and the application prospect is good. For the image acquisition terminal supporting network cable power supply, the transmission circuit supplies power to the image acquisition terminal equipment after detection. For the image acquisition terminal which does not support network cable power supply, the transmission circuit can not output power supply voltage, so that the safety of the image acquisition terminal is protected.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a circuit based on net twine transmission multi-signal analog changes digit can be through the level that detects the access image acquisition front end, judges whether the equipment of access supports the net twine power supply, and the security is high.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a circuit for converting multiple signals from analog to digital based on network cable transmission comprises:
the system comprises a transmitting end network cable interface, a power supply monitoring circuit, a protection circuit, a power supply indication and rear end modulation conversion circuit, wherein the power supply monitoring circuit, the protection circuit, the power supply indication and the rear end modulation conversion circuit are connected with the transmitting end network cable interface;
the system comprises a receiving end network cable interface, an isolated power circuit, a short-circuit protection circuit, a power failure indication circuit, a protocol circuit and a front end modulation conversion circuit, wherein the isolated power circuit, the short-circuit protection circuit, the power failure indication circuit, the protocol circuit and the front end modulation conversion circuit are connected with the receiving end network cable interface;
and the network cable is used for connecting the network cable interface of the sending end and the network cable interface of the receiving end, the network cable comprises a power transmission line used for connecting the power monitoring circuit with the isolated power circuit and the protocol circuit, and an analog-to-digital signal transmission line used for connecting the rear-end modulation conversion circuit with the front-end modulation conversion circuit, and the power transmission line and the analog-to-digital signal transmission line are different twisted wire pairs in the same network cable.
Furthermore, the power monitoring circuit comprises a detection circuit, a control circuit and a switch circuit, the detection circuit is connected with the switch circuit and the network cable interface of the sending end, and the control circuit is respectively connected with the signal output end of the detection circuit and the switch circuit and is used for receiving the output signal of the detection circuit and controlling the on-off of the switch circuit.
Preferably, the switch circuit is an MOS (metal oxide semiconductor) tube, the opening of the MOS tube is jointly determined by the detection and control circuit, when the MOS tube is normally conducted, the power switch circuit starts to supply power to the matching end, the indication signal lamp flickers, and the power supply indication circuit normally works.
Furthermore, the multiple analog-to-digital signal long-distance transmission circuit further comprises a power supply, the power supply is connected with the source electrode of the MOS tube, the signal output end of the control circuit is connected with the grid electrode of the MOS tube, and the power input end of the detection circuit is connected with the drain electrode of the MOS tube.
Furthermore, the multiple analog-to-digital signal long-distance transmission circuit further comprises an analog-to-digital signal processing circuit, wherein the analog-to-digital signal processing circuit is connected with the rear-end modulation conversion circuit, and is used for receiving, converting, storing or outputting audio signals and video signals and sending out coaxial signals.
Preferably, the network cable interface is an RJ45 interface, and the network cable model can be selected to use four-core, six-core, eight-core transmission of a standard network cable.
Furthermore, this multiple analog-to-digital signal long distance transmission circuit still includes the video acquisition terminal, the power port at video acquisition terminal is connected keep apart power supply circuit, keep apart power supply circuit output and can supply video acquisition terminal operating voltage, the pilot lamp lights, and analog-to-digital signal processing circuit accessible RJ45 interface transmits audio output signal to audio frequency and video acquisition terminal simultaneously, realizes audio signal's bidirectional transmission, preferred six cores and eight core network cables this moment to realize full function's audio frequency, video, coaxial signal transmission circuit. The signal input/output port is connected with the front-end modulation conversion circuit.
The utility model has the advantages that:
the utility model provides a circuit based on net twine transmission multi-signal analog-to-digital, including modulation conversion circuit, power monitoring circuit and net twine interface; the modulation conversion circuit is used for converting the differential signal into a single-ended audio signal, a single-ended video signal and a single-ended coaxial signal or converting the single-ended audio signal, the single-ended video signal and the single-ended coaxial signal into the differential signal; the network cable interface is used for connecting the modulation conversion circuit and the power supply monitoring circuit with a network cable; the power supply monitoring circuit is used for judging whether the image acquisition terminal supports network cable power supply or not by combining with the protocol circuit and controlling the on-off of a power supply of audio and video acquisition terminal equipment accessed through a network cable interface, and the protection circuit is used for closing the network cable power supply by detecting the short circuit of the output end of the network cable interface and the direct current level quantity of the audio and video acquisition terminal equipment, so that the safety of the image acquisition terminal and the front stage of a long-distance transmission circuit of various analog-to-digital signals is protected. The utility model discloses a multiple analog-to-digital signal long distance transmission circuit based on net twine, in the in-service use, it is simple to have the wiring, characteristics safe in utilization, but the wide application is in video monitoring equipment.
Drawings
Fig. 1 is a block diagram of a circuit for converting analog signals to digital signals based on network cable transmission according to a first embodiment of the present invention.
Fig. 2 is a block diagram of a circuit for converting analog signals to digital signals based on network cable transmission according to a second embodiment of the present invention.
Fig. 3 is a block diagram of a circuit for converting analog signals to digital signals based on network cable transmission according to a third embodiment of the present invention.
Detailed Description
For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.
It should be noted that, hereinafter, analog-to-digital signals including audio signals, video signals, coaxial signals, and the like are transmitted in the back-end modulation conversion and front-end modulation conversion circuits.
Example 1
Fig. 1 is a block diagram of a circuit for converting analog signals to digital signals based on network cable transmission according to a first embodiment of the present invention, the circuit includes:
a transmitting end network cable interface and a receiving end network cable interface, which is preferably an RJ45 interface.
The power supply monitoring circuit, the protection circuit and the rear end modulation conversion circuit are connected with the network cable interface of the sending end, and the isolation power supply circuit, the protocol circuit and the front end modulation conversion circuit are connected with the network cable interface of the receiving end.
And the network cable is connected with the network cable interface of the sending end and the network cable interface of the receiving end, and comprises a power transmission line PA for connecting the power monitoring circuit with the isolation power circuit and the protocol circuit, an analog-to-digital signal transmission line PB for connecting the rear-end modulation conversion circuit with the front-end modulation conversion circuit, and an audio signal transmission line PC for connecting the audio circuit and the audio and video acquisition module, wherein the three are different twisted wire pairs in the same network cable, and the PB transmission line can contain analog-to-digital signals of audio signals, video signals and coaxial signals.
In the circuit, an isolation power supply circuit, a protocol circuit, a power failure indicating circuit and a front end modulation conversion circuit are used for connecting a front end video acquisition terminal, and a power supply monitoring circuit and a rear end modulation conversion circuit are used for connecting a rear end power supply and an analog-to-digital signal processing circuit.
The protocol circuit is used for being matched with the power supply monitoring circuit to realize detection and identification of the image acquisition terminal. Specifically, when the protocol circuit is connected with the image acquisition terminal, after a certain low voltage and weak current signal is applied through the power transmission PA line, the corresponding low voltage and weak current signal can be fed back and transmitted to the power monitoring circuit through the power transmission line PA, so that the power monitoring circuit can determine whether the front end is accessed and whether the accessed image acquisition terminal supports network cable power supply according to the voltage/current signal fed back by the power monitoring circuit, further judge whether the accessed image acquisition terminal needs to be powered, if the detection circuit detects that the corresponding matched image acquisition terminal can be powered, then provide power for the isolated power circuit through the PA transmission line, and therefore the safety and the stability of the image acquisition terminal are protected.
When the power supply is needed to be supplied to the accessed image acquisition terminal, the power supply monitoring circuit is powered on, the power supply indicating circuit works normally at the moment, the indicating lamp is in a flashing state, the fact that the power supply detection control circuit supplies power normally is indicated, needed power is provided and transmitted to the isolation power supply circuit through the transmission line PA, the isolation power supply circuit converts input power supply voltage into voltage matched with the image acquisition terminal and outputs the voltage to the image acquisition terminal, when the isolation power supply circuit successfully converts and matches the voltage needed by the image acquisition terminal, the power failure indicating circuit works, the indicating lamp is normally on, when the power supply is disconnected at the PA end of the power supply transmission line, the power failure indicating lamp is in a power failure state until the PA of the source end network cable recovers power.
The front-end modulation conversion circuit is used for converting a single-end analog-to-digital signal output by the image acquisition terminal into a differential analog-to-digital signal and inputting the differential analog-to-digital signal into the transmission line PB. And the other rear end modulation conversion circuit is used for converting the differential analog-to-digital signals input by the transmission line PB into single-ended analog-to-digital signals and further outputting the single-ended analog-to-digital signals to the analog-to-digital signal processing circuit, and when analog-to-digital audio, video, coaxial and other signals are transmitted to the analog-to-digital signal processing circuit on the PB transmission line, the signal indicating circuit starts to work to indicate that the signal transmission of the network line receiving end is normal at the moment. The PC transmission line is used for transmitting other analog-to-digital signals such as audio and the like, and can be used for outputting the analog-to-digital signals such as the audio and the like to the audio and video acquisition terminal through the PC transmission line so as to realize the input and output of the signals such as the audio and the like.
Above-mentioned the utility model discloses a circuit based on net twine transmission multi-signal analog changes digit through the direct current level parameter of detection and analysis net twine access mouth, can judge whether have image acquisition terminal to insert to whether the image acquisition terminal that further judges to insert supports the net twine power supply, has the wiring convenience, easy operation, the high advantage of security.
Example 2
Fig. 2 is a block diagram of a circuit for converting analog signals to digital signals based on network cable transmission according to a second embodiment of the present invention. The basic structure is the same as the circuit in the first embodiment, and is not described in detail.
As a preferred embodiment, the power monitoring circuit in this embodiment includes a detection circuit, a control circuit, and a switch circuit. The detection circuit is connected with the switch circuit and the sending end network cable interface, and the control circuit is respectively connected with the signal output end of the detection circuit and the switch circuit and used for receiving the output signal of the detection circuit and controlling the on-off of the switch circuit.
Specifically, the detection circuit is used for detecting a level parameter fed back by the protocol circuit on the power transmission line PA accessed through the network cable interface, judging whether an image acquisition terminal is accessed, further judging whether the accessed acquisition terminal supports power supply through the range of the level parameter of the access port, and outputting a corresponding level parameter to the control circuit.
The control circuit determines a level signal output to the switch circuit according to the input level parameter, and the switch circuit performs on and off operations of the switch according to the input level signal.
The detection circuit can judge whether a short circuit exists according to the level parameter of the detection end, so that the power supply MOS is controlled to be switched off until the short circuit disappears in the protection circuit.
The utility model discloses a circuit based on net twine transmission multi-signal analog changes figure of second embodiment through the direct current level parameter of detection and analysis net twine access mouth, can judge whether there is the image acquisition terminal to insert to whether the image acquisition terminal of further judgement access supports the net twine power supply, and the security is high.
Example 3
Fig. 3 is a block diagram of a circuit for converting analog signals to digital signals based on network cable transmission according to a third embodiment of the present invention. The basic structure is the same as the circuit in the second embodiment, and is not described in detail. On the basis of the second embodiment, a power supply, an analog-to-digital signal processing circuit and a video capture terminal are added in the embodiment.
As a preferred embodiment, the switching circuit in this embodiment is a MOS transistor. Furthermore, the multiple analog-to-digital signal long-distance transmission circuit in this embodiment further includes a power supply, the power supply is connected to the source electrode of the MOS transistor, the signal output end of the control circuit is connected to the gate electrode of the MOS transistor, the power input end of the detection circuit is connected to the drain electrode of the MOS transistor, and when the MOS transistor is in an open state, the detection circuit provides a signal to the power supply indicating circuit, so that the power supply indicating lamp is always in a normal flashing state.
The power supply is used for providing 48V direct current level signals, the corresponding isolation power supply circuit is used for converting the 48V direct current level signals accessed through the power transmission line into 12V direct current level signals to supply power to the video acquisition terminal, when the isolation power supply circuit converts the direct current levels, the power failure indicating circuit works, the power failure indicating lamp is normally on, otherwise, the isolation power supply circuit does not provide required levels, and the power failure indicating lamp is turned off.
The analog-to-digital signal processing circuit can be used for receiving, converting, storing and outputting audio signals and video signals output by the rear-end modulation conversion circuit and sending out coaxial signals, meanwhile, the analog-to-digital signal processing circuit can transmit audio output signals to an audio and video acquisition terminal through a PC audio line through an RJ45 interface, bidirectional transmission of the audio signals is achieved, and at the moment, six-core and eight-core network cables are preferably selected to achieve a full-function audio, video and coaxial signal transmission circuit.
The video acquisition terminal is used for acquiring audio signals and digital video signals and receiving coaxial signals.
The utility model discloses a circuit based on net twine transmission multi-signal analog changes digit of third embodiment has further integrated power supply, analog to digital signal processing circuit and video acquisition terminal, can regard as the whole to be applied to in the video monitoring equipment.
The above various implementation circuits may be implemented by those skilled in the art according to common knowledge through different device types and circuit connection modes, and are not illustrated here.
The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (7)
1. A circuit for converting analog signals to digital signals based on network cable transmission, comprising:
the system comprises a transmitting end network cable interface, a power supply monitoring circuit, a protection circuit, a power supply indication circuit, a signal indication circuit and a rear end modulation conversion circuit, wherein the power supply monitoring circuit, the protection circuit, the power supply indication circuit, the signal indication circuit and the rear end modulation conversion circuit are connected with the transmitting end network cable interface;
the system comprises a receiving end network cable interface, an isolated power circuit, a short-circuit protection circuit, a power failure indication circuit, a protocol circuit and a front end modulation conversion circuit, wherein the isolated power circuit, the short-circuit protection circuit, the power failure indication circuit, the protocol circuit and the front end modulation conversion circuit are connected with the receiving end network cable interface;
and the network cable is used for connecting the network cable interface of the sending end and the network cable interface of the receiving end, the network cable comprises a power transmission line used for connecting the power monitoring circuit with the isolated power circuit and the protocol circuit, and an analog-to-digital signal transmission line used for connecting the rear-end modulation conversion circuit with the front-end modulation conversion circuit, and the power transmission line and the analog-to-digital signal transmission line are different twisted wire pairs in the same network cable.
2. The circuit for converting multiple signals from analog to digital according to claim 1, wherein the power monitoring circuit comprises a detection circuit, a control circuit and a switch circuit, the detection circuit is connected to the switch circuit and the network interface of the transmitting terminal, and the control circuit is respectively connected to the signal output terminal of the detection circuit and the switch circuit, and is configured to receive the output signal of the detection circuit and control the on/off of the switch circuit.
3. The circuit for converting multiple signals from analog to digital according to claim 2, wherein the switching circuit is an MOS transistor, the MOS transistor being turned on is determined by the detection and control circuit, and when the MOS transistor is normally turned on, the power switching circuit starts to supply power to the matching terminal, indicating that the signal lamp is flashing, and the power supply indicating circuit indicates that the power supply is working normally.
4. The circuit for converting multiple signals from analog to digital based on network cable transmission of claim 3, further comprising a power supply, wherein the power supply is connected to the source of the MOS transistor, the signal output terminal of the control circuit is connected to the gate of the MOS transistor, and the power input terminal of the detection circuit is connected to the drain of the MOS transistor.
5. The circuit for transmitting multiple signals from analog to digital according to claim 1, further comprising an analog to digital signal processing circuit, wherein the analog to digital signal processing circuit is connected to the back-end modulation conversion circuit, and is configured to receive, convert, store, or output audio signals and video signals, and send out coaxial signals, and when the analog to digital signal processing circuit receives the audio and video signals, the signal indicating circuit operates normally.
6. The circuit for converting analog signals into digital signals based on network cable transmission as claimed in claim 1, wherein the network cable interface is an RJ45 interface, and the network cable type can be selected with four-core, six-core and eight-core transmission of standard network cable.
7. The circuit for converting multiple signals from analog to digital according to any one of claims 1 to 6, further comprising a video capture terminal, wherein a power port of the video capture terminal is connected to the isolated power circuit, the isolated power circuit outputs an operating voltage for the video capture terminal, the indicator light is turned on, and a signal input/output port of the video capture terminal is connected to the front-end modulation conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020515370.XU CN212305487U (en) | 2020-04-11 | 2020-04-11 | Circuit for converting multi-signal analog to digital based on network cable transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020515370.XU CN212305487U (en) | 2020-04-11 | 2020-04-11 | Circuit for converting multi-signal analog to digital based on network cable transmission |
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| Publication Number | Publication Date |
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| CN212305487U true CN212305487U (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020515370.XU Expired - Fee Related CN212305487U (en) | 2020-04-11 | 2020-04-11 | Circuit for converting multi-signal analog to digital based on network cable transmission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117156090A (en) * | 2023-10-30 | 2023-12-01 | 浙江禾川科技股份有限公司 | Remote display device, system and method |
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2020
- 2020-04-11 CN CN202020515370.XU patent/CN212305487U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117156090A (en) * | 2023-10-30 | 2023-12-01 | 浙江禾川科技股份有限公司 | Remote display device, system and method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210105 |