CN102710295B - Repeater - Google Patents

Repeater Download PDF

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Publication number
CN102710295B
CN102710295B CN201210182266.3A CN201210182266A CN102710295B CN 102710295 B CN102710295 B CN 102710295B CN 201210182266 A CN201210182266 A CN 201210182266A CN 102710295 B CN102710295 B CN 102710295B
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CN
China
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described
signal
interface
sdi
cable
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CN201210182266.3A
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Chinese (zh)
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CN102710295A (en
Inventor
刘明学
蔡茂
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成都微迪数字系统技术有限公司
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Priority to CN201210182266.3A priority Critical patent/CN102710295B/en
Publication of CN102710295A publication Critical patent/CN102710295A/en
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Abstract

The invention discloses a repeater which comprises a first interface, a first signal separator, a waveform processor, a second interface, a second signal processor, a controller and an electronic switch, wherein the first interface, the first signal separator and the waveform processor are connected with a first cable; the second interface, the second signal separator and the controller are connected with a second cable; the electronic switch is respectively connected with the second interface, the second signal separator and the controller; the first interface is used for acquiring a first mixing signal transmitted in the first cable; the first signal separator is used for separating a first SDI (Serial Digital Interface) signal from the first mixing signal; the waveform processor is used for recovering the separated first SDI signal into a standard SDI signal and transmitting the standard SDI signal to the second interface; the second interface is used for acquiring a second mixing signal transmitted in the second cable; the second signal separator is used for separating a first power signal from the second mixing signal; and the controller is used for controlling the electronic switch to be closed when the condition that a load meeting the preset condition is connected to the first interface is detected, and thus the transmission of the power signal and the SDI signal on one coaxial cable is realized and the use amount of the coaxial cable is reduced.

Description

A kind of repeater

Technical field

The application relates to field of signal transmissions, particularly a kind of repeater.

Background technology

Along with the development in safety monitoring system digitlization and high Qinghua, by broadcast level standard SDI(SerialDigital Interface, digital serial interface) be incorporated in security protection application.As, employing has the image of the camera collection guarded region of high definition, the package images collecting is sent to watch-dog in sdi signal and shows, is convenient to monitor staff and checks.

Because the effective propagation path of sdi signal is limited, so, when the distance of camera and watch-dog surpasses the effective propagation path of sdi signal, in order to reach predetermined transmission range, need to adopt one or more repeaters to carry out relay transmission to sdi signal, this just need to provide repeater operation required electric power signal, and because electric power signal and sdi signal are two contrary signals of transmission direction, so, at present electric power signal and sdi signal are respectively in transmission over coaxial cable independently, strengthened like this layout difficulty of coaxial cable, and increase the use amount of coaxial cable, further increased operation cost.

Summary of the invention

The application's technical problem to be solved is to provide a kind of repeater, to solve electric power signal and sdi signal respectively in transmission over coaxial cable independently, strengthen the layout difficulty of coaxial cable, and increased the use amount of coaxial cable, and then increased the problem of operation cost.

In order to address the above problem, the application discloses a kind of repeater, comprising:

The first interface being connected with the first cable, first signal separator, waveform processor, the second interface being connected with the second cable, secondary signal separator, controller and the electronic switch being connected with described the second interface, secondary signal separator and described controller respectively; Wherein,

Described first interface is for obtaining the first mixed signal that described the first cable transmits, and described the first mixed signal comprises the first sdi signal and the second electric power signal;

Described first signal separator is for isolating described the first sdi signal from described the first mixed signal;

Described waveform processor is sent to described the second interface for after the first sdi signal of separating is reverted to standard sdi signal;

Described the second interface is for obtaining the second mixed signal that described the second cable transmits, and described the second mixed signal comprises the second sdi signal and the first electric power signal;

Described secondary signal separator is for isolating described the first electric power signal from described the second mixed signal;

Described controller, for being connected with while meeting pre-conditioned load described first interface being detected, is controlled described electronic switch closes.

Above-mentioned repeater, preferred, described first interface and described the second interface are respectively arranged with lightning arrester.

Above-mentioned repeater, preferred, described waveform processor comprises:

Equalizer, for carrying out level amplification and waveform shaping to described the first sdi signal of separating;

Clock recovery device, for extracting SDI clock signal from the first sdi signal after over level amplification and waveform shaping, and through over level, amplify and waveform shaping described with standard clock signal, and the first sdi signal extracting after SDI clock signal reverts to standard sdi signal.

Above-mentioned repeater, preferred, described to meet pre-conditioned load be the load in preset range of the difference of resistance value and default resistance value.

Above-mentioned repeater, preferred, described the second mixed signal also comprises the first control signal;

Accordingly, described repeater also comprises:

Be connected with described the second interface, isolate the 3rd demultiplexer of described control signal;

Be connected with described first interface with described the 3rd demultiplexer respectively, by the frequency modulation(FM) of the described control signal of separating to the modulator that is sent to described first interface after preset value.

A transmission system, comprising:

Repeater as above;

By described the first cable, be connected with described repeater, send the HD-SDI video camera of sdi signal;

By described the second cable, be connected with described repeater, the power supply of described repeater required electric power signal is provided;

By described the second cable, be connected with described repeater, the controller transmitting control signal

From such scheme, a kind of repeater that the embodiment of the present application provides is isolated sdi signal by first signal separator, and the sdi signal of separating is sent to the second interface after shaping from the mixed signal of first interface input; By secondary signal separator, from the mixed signal of the second interface input, isolate electric power signal, and be connected with while meeting pre-conditioned load first interface being detected, by closed electronic switch, the electric power signal of separating is sent to first interface, electric power signal and sdi signal have been realized a transmission over coaxial cable, reduced the layout difficulty of coaxial cable, reduce the use amount of coaxial cable, and then reduced operation cost.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the structural representation of a kind of repeater of providing of the embodiment of the present application;

Fig. 2 is the structural representation of the another kind of repeater that provides of the embodiment of the present application;

Fig. 3 is the structural representation of the 4th demultiplexer that provides of the embodiment of the present application.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.

Embodiment mono-

With reference to figure 1, show the structural representation of a kind of repeater that the embodiment of the present application provides, comprising:

The first interface 11 being connected with the first cable, first signal separator 12, waveform processor 13, the second interface 14 being connected with the second cable, secondary signal separator 15, controller 16 and the electronic switch 17 being connected with described first interface, secondary signal separator 15 and described controller 16 respectively; Wherein,

The first mixed signal that first interface 11 transmits for obtaining described the first cable, described the first mixed signal can comprise the first sdi signal and the second electric power signal; Preferably, first interface 11 can be RJ45 interface

First signal separator 12 is for isolating described the first sdi signal from described the first mixed signal, concrete, because electric power signal is direct current signal, sdi signal is high-frequency signal with respect to electric power signal, so first signal separator 12 can be high pass filter, by high pass filter, the first sdi signal transmitting in the first cable is separated from described the first mixed signal;

Waveform processor 13 is sent to described the second interface 14 after the first sdi signal of separating being reverted to standard sdi signal, by the second cable being connected with the second interface 14, described standard sdi signal is sent;

Concrete, waveform processor 13 can comprise: equalizer 131 and clock recovery device 132;

Equalizer 131 is for carrying out level amplification and waveform shaping to described the first sdi signal of separating.

Although vision signal becomes digit data stream through coding, but sdi signal remains simulation in itself, and still can be subject to the impact of the distortions such as decay and phase shift, longer cable easily produces dropout and phase shift, make signal occur distortion, therefore at receiving terminal, adding an extra equalizer 131(can be cable equalizer) with compensating distortion.In cable transmission, frequency response characteristic due to cable, signal can produce loss and the distortion such as phase shift, and equalizer 131 can afford redress for distorted signal, can also be by adding the characteristics such as balanced scope, noiseproof feature of longer cable butting receiving end to make an appraisal.

Clock recovery device 132 is for extracting SDI clock signal from the first sdi signal after over level amplification and waveform shaping, and through over level, amplify and waveform shaping described with standard clock signal, and the first sdi signal extracting after SDI clock signal reverts to standard sdi signal.

Because equalizer cannot be removed shake intrinsic in signal and noise, therefore in order not make the shake of whole signal link stacked, utilize clock recovery device 132 to regenerate clean sdi signal, it should be noted that clock recovery device needs the amplitude of equalizer reconstruction signal before again producing data and opens eye pattern.

The second mixed signal that the second interface 14 transmits for obtaining described the second cable, described the second mixed signal can comprise the second sdi signal and the first electric power signal; Sdi signal in described the second cable is, by waveform processor 13, the first sdi signal of separating is carried out to the sdi signal after shaping; Preferably, the second interface 14 can be also RJ45 interface

Secondary signal separator 15 is for isolating described the first electric power signal from described the second mixed signal, concrete, because electric power signal is direct current signal, sdi signal is high-frequency signal with respect to electric power signal, so, secondary signal separator 15 can be low pass filter, by low pass filter separated first electric power signal from described the second mixed signal.

Controller 16, for being connected with while meeting pre-conditioned load described first interface being detected, is controlled described electronic switch 17 closures;

Concrete, the initial condition of electronic switch 17 is opening, when secondary signal separator 15 is isolated the first electric power signal, controller 16 detects first interface and whether is connected with legitimate device, whether detect first interface is connected with and meets pre-conditioned load, concrete, whether controller 16 can meet the pre-conditioned legitimate device that judges whether to be connected with by detecting the characteristic impedance value of first interface 11, preferably, the difference that the characteristic impedance value of first interface 11 and default characteristic impedance value (described default characteristic impedance value can be the characteristic impedance value of the repeater that provides of the embodiment of the present application) detected when controller 16 is in preset range time, think that described first interface 11 is connected with legitimate device, control described electronic switch 17 closures, electric power signal is sent to the first cable by described first interface 11 to be transmitted.

Preferably, for the ease of outdoor application, prevent the unexpected failures such as thunderbolt, at first interface 11 and the second interface 14 places, all added lightning Protection Design, for example, lightning arrester is set.

A kind of repeater that the embodiment of the present application provides is isolated sdi signal by first signal separator, and the sdi signal of separating is sent to the second interface after shaping from the mixed signal of first interface input; By secondary signal separator, from the mixed signal of the second interface input, isolate electric power signal, and be connected with while meeting pre-conditioned load first interface being detected, by closed electronic switch, the electric power signal of separating is sent to first interface, electric power signal and sdi signal have been realized a transmission over coaxial cable, reduced the layout difficulty of coaxial cable, reduce the use amount of coaxial cable, and then reduced operation cost.

Embodiment bis-

Preferably, when the second mixed signal of transmitting in described the second cable also comprises control signal, the structure of the another kind of repeater that the embodiment of the present application provides as shown in Figure 2, comprising:

The first interface 21 being connected with the first cable, the 3rd demultiplexer 22, waveform processor 23, the second interface 24 being connected with the second cable, the 4th demultiplexer 25, controller 26 and the electronic switch 27, the 5th demultiplexer 28 and the modulator 29 that are connected with described first interface, the 4th demultiplexer 25 and described controller 26 respectively;

The first mixed signal that first interface 21 transmits for obtaining described the first cable, described the first mixed signal can comprise the first sdi signal, the second electric power signal and the second control signal; Preferably, first interface 21 can be RJ45 interface.

The 3rd demultiplexer 22 is for isolating described the first sdi signal from described the first mixed signal, preferably, described first signal separator 12 can be high pass filter, be specifically as follows the first capacitance, described the first capacitance only allows described the first sdi signal or described the second control signal to pass through, and does not allow described the second electric power signal to pass through; Described first signal separator can also be high-pass filtering circuit.

Waveform processor 23 is sent to described the second interface 24 for the first sdi signal of separating is carried out after shaping, by the second cable being connected with the second interface 24, the first sdi signal of separating is sent;

Concrete, waveform processor 23 can comprise: equalizer 231 and clock recovery device 232;

Equalizer 231 is for carrying out level amplification and waveform shaping to described the first sdi signal of separating;

Clock recovery device 232 is for extracting SDI clock signal from the first sdi signal after over level amplification and waveform shaping, and through over level, amplify and waveform shaping described with standard clock signal, and the first sdi signal extracting after SDI clock signal reverts to standard sdi signal.

The second mixed signal that the second interface 24 transmits for obtaining described the second cable, described the second mixed signal can comprise the second sdi signal, the first electric power signal and the first control signal; Sdi signal in described the second cable is, by waveform processor 23, the first sdi signal of separating is carried out to the sdi signal after shaping; Preferably, the second interface 24 can be also RJ45 interface

The 4th demultiplexer 25 is for isolating described the first electric power signal from described the second mixed signal;

Concrete, the structural representation of the 4th demultiplexer 25 as shown in Figure 3, can comprise:

The inductance (L1, L2, L3) of the plural serial stage being connected with the second interface 24, wherein, every one-level inductance in parallel has a resistance (L1 is in parallel with R1, L2 is in parallel with R2, L3 in parallel with R3), and the capacitor C 1 of connecting with described plural serial stage inductance, the common port of described plural serial stage inductance and described electric capacity is the output of described the first electric power signal.

Controller 26, for being connected with while meeting pre-conditioned load described first interface being detected, is controlled described electronic switch 27 closures;

Concrete, the initial condition of electronic switch 27 is opening, when the 4th demultiplexer 25 is isolated the first electric power signal, controller 26 detects first interface and whether is connected with legitimate device, whether detect first interface is connected with and meets pre-conditioned load, concrete, whether controller 26 can meet the pre-conditioned legitimate device that judges whether to be connected with by detecting the characteristic impedance value of first interface 21, preferably, the difference that the characteristic impedance value of first interface 21 and default characteristic impedance value (described default characteristic impedance value can be the characteristic impedance value of the repeater that provides of the embodiment of the present application) detected when controller 26 is in preset range time, think that described first interface 21 is connected with legitimate device, control described electronic switch 27 closures, electric power signal is sent to the first cable by described first interface 21 to be transmitted.

The 5th demultiplexer 28 is for isolating described control signal from described the second mixed signal; The 5th concrete demultiplexer 28 can comprise: be connected with described the second cable, the second capacitance of the electric power signal described in filtering in the second mixed signal, be connected with described the second capacitance RC low pass filter.

Modulator 29 for being sent to described first interface 21 by the frequency modulation(FM) of the described control signal of separating, by control signal described in described the first cable transmission after preset value.

The application also provides a kind of transmission system, comprising:

Repeater as above;

By described the first cable, be connected with described repeater, send the HD-SDI video camera of sdi signal;

By described the second cable, be connected with described repeater, by the power supply of electric power signal described in described repeater;

By described the second cable, be connected with described repeater, send for controlling the controller of the control signal of described HD-SDI video camera work.

It should be noted that, each embodiment in this specification all adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.For device class embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.

Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.

While for convenience of description, describing above device, with function, being divided into various unit describes respectively.Certainly, when implementing the application, the function of each unit can be realized in same or a plurality of software and/or hardware.

As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the application can add essential general hardware platform by software and realizes.Understanding based on such, the part that the application's technical scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the application or embodiment.

The explanation of above embodiment is just for helping to understand the application's method and core concept thereof; Meanwhile, for one of ordinary skill in the art, the thought according to the application, all will change in specific embodiments and applications, and in sum, this description should not be construed as the restriction to the application.

Claims (5)

1. a repeater, is characterized in that, comprising:
The first interface being connected with the first cable, first signal separator, waveform processor, the second interface being connected with the second cable, secondary signal separator, controller and the electronic switch being connected with described the second interface, secondary signal separator and described controller respectively; Wherein,
Described first interface is for obtaining the first mixed signal that described the first cable transmits, and described the first mixed signal comprises the first sdi signal and the second electric power signal;
Described first signal separator is for isolating described the first sdi signal from described the first mixed signal;
Described waveform processor is sent to described the second interface for after the first sdi signal of separating is reverted to standard sdi signal;
Described the second interface is for obtaining the second mixed signal that described the second cable transmits, and described the second mixed signal comprises the second sdi signal and the first electric power signal;
Described secondary signal separator is for isolating described the first electric power signal from described the second mixed signal;
Described controller, for being connected with while meeting pre-conditioned load described first interface being detected, is controlled described electronic switch closes;
Wherein, described waveform processor comprises: equalizer, for described the first sdi signal of separating is carried out to level amplification and waveform shaping; Clock recovery device, for extracting SDI clock signal from the first sdi signal after over level amplification and waveform shaping, and through over level, amplify and waveform shaping described with standard clock signal, and the first sdi signal extracting after SDI clock signal reverts to standard sdi signal.
2. repeater according to claim 1, is characterized in that, described first interface and described the second interface are respectively arranged with lightning arrester.
3. repeater according to claim 1, is characterized in that, described to meet pre-conditioned load be the load in preset range of the difference of resistance value and default resistance value.
4. repeater according to claim 1, is characterized in that, described the second mixed signal also comprises the first control signal;
Accordingly, described repeater also comprises:
Be connected with described the second interface, isolate the 3rd demultiplexer of described control signal;
Be connected with described first interface with described the 3rd demultiplexer respectively, by the frequency modulation(FM) of the described control signal of separating to the modulator that is sent to described first interface after preset value.
5. a transmission system, is characterized in that, comprising:
Repeater as described in any one in claim 1-4;
By described the first cable, be connected with described repeater, send the HD-SDI video camera of sdi signal;
By described the second cable, be connected with described repeater, the power supply of described repeater required electric power signal is provided;
By described the second cable, be connected with described repeater, the controller transmitting control signal.
CN201210182266.3A 2012-06-05 2012-06-05 Repeater CN102710295B (en)

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US9077557B2 (en) * 2013-02-13 2015-07-07 Fairchild Semiconductor Corporation Data-on-supply repeater

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN101304393A (en) * 2007-02-16 2008-11-12 格努姆有限公司 Multi-media digital interface systems and methods
CN102340646A (en) * 2011-09-14 2012-02-01 福建金钱猫电子科技有限公司 High-frequency and low-frequency multipurpose coaxial cable bridge
CN202261275U (en) * 2011-09-21 2012-05-30 天津市亚安科技股份有限公司 Data transmission circuit for increasing return loss of HD-SDI (high definition serial digital interface)

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Publication number Priority date Publication date Assignee Title
CA2713618A1 (en) * 2009-09-01 2011-03-01 Embrionix Design Inc. Small form factor pluggable transceiver module-sdi

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101304393A (en) * 2007-02-16 2008-11-12 格努姆有限公司 Multi-media digital interface systems and methods
CN102340646A (en) * 2011-09-14 2012-02-01 福建金钱猫电子科技有限公司 High-frequency and low-frequency multipurpose coaxial cable bridge
CN202261275U (en) * 2011-09-21 2012-05-30 天津市亚安科技股份有限公司 Data transmission circuit for increasing return loss of HD-SDI (high definition serial digital interface)

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