CN203761494U - DVI video signal transmission device - Google Patents
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- CN203761494U CN203761494U CN201420174247.0U CN201420174247U CN203761494U CN 203761494 U CN203761494 U CN 203761494U CN 201420174247 U CN201420174247 U CN 201420174247U CN 203761494 U CN203761494 U CN 203761494U
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Abstract
The utility model discloses a DVI video signal transmission device comprising a shell and a circuit board disposed therein. The circuit board is provided with a balance module, a decoding module and an encoding module which are connected in order. The balance module is connected with an input port disposed on the shell. The input port is used for being connected with a first DVI transmission link. The encoding module is connected with an output port disposed on the shell. The output port is used for being connected with a second DVI transmission link. The DVI video signal transmission device has the advantages that DVI video signals transmitted in the links can be subjected to data recovery, quality of signals transmitted to terminal display equipment is guaranteed, and the DVI video signal transmission device is applicable to long-range transmission.
Description
Technical field
The utility model relates to video transmission technologies, relates in particular to a kind of DVI video signal transmission device.
Background technology
Digital visual interface (Digital Visual Interface, be called for short DVI) is transmission of video showing by numeral that working group (DDWG) releases and the standard of demonstration, and along with liquid crystal display becomes main flow display device, DVI is widely used.The DVI standard of formulating according to DDWG, its effective propagation path is 5 meters.And in actual commercial Application, often can run into the situation of the long distance D VI video signal transmission that surpasses 5 meters.
In prior art, for remote DVI video signal transmission, a kind of method is to adopt DVI cable transmission, by Signal Booster, carry out signal enhancing again, because the quality of cable product has material impact to vision signal, therefore DVI vision signal is after long Distance Transmission, especially after low quality cable transmission, signal is gross distortion, even strengthen processing by Signal Booster, can not recover the good signal of quality, thereby cause the monitor signal distortion of transmission terminal.For the DVI vision signal that the reduces low-cost electric cable transmission distorted signals in terminal display, be necessary to provide a kind of economical and practical DVI video-signal transmission method.
Utility model content
The utility model provides a kind of DVI video signal transmission device, in order to the DVI vision signal to transmitting in link, carries out data recovery, guarantees to be transferred to the signal quality on terminal presentation facility.
The utility model provides a kind of DVI video signal transmission device, comprise: shell and setting circuit board in the enclosure, on described circuit board, be provided with the balance module, decoder module and the coding module that connect successively, described balance module is connected with the input port being arranged on shell, described input port is for being connected with a DVI transmission link, described coding module is connected with the output port being arranged on shell, and described output port is for being connected with the 2nd DVI transmission link
In one embodiment, described balance module, carries out equilibrium treatment for the DVI vision signal that the DVI transmission link obtaining is transmitted, and obtains the transition minimized differential signaling of low jitter;
Described decoder module, for described transition minimized differential signaling being carried out to string transforms decode processing, obtains the parallel rgb signal of low skew;
Described coding module, processes for the parallel rgb signal of described low skew being carried out to parallel-serial conversion coding, obtains the DVI vision signal of transmitting in the 2nd DVI transmission link.
In one embodiment, described balance module also connects with the balanced selector switch being arranged on shell, and described balanced selector switch, for according to the length of a described DVI transmission link cable, is selected balanced grade;
Described balance module, specifically for according to the balanced grade of selecting, described DVI vision signal being carried out to equilibrium treatment, obtains the transition minimized differential signaling of low jitter.
In one embodiment, described balance module comprises:
The first phase locked-loop unit, carries out phase-locked processing for the clock signal in the DVI vision signal that the DVI transmission link obtaining is transmitted, and obtains the first sampled clock signal of low jitter;
Balanced unit, carries out high frequency compensation processing for the data-signal in the DVI vision signal that the DVI transmission link obtaining is transmitted;
Data recovery unit, is reference clock for take described the first sampled clock signal, and the data-signal after high frequency compensation is processed carries out data recovery, obtains the transition minimized differential signaling of low jitter.
In one embodiment, described decoder module comprises:
The second phase locked-loop unit, for the clock signal of described transition minimized differential signaling is carried out to phase-locked processing, obtains the second sampled clock signal;
Decoding unit, is reference clock for take described the second sampling clock, respectively the data-signal of each passage in described transition minimized differential signaling is gone here and there and transforms decode is processed, and obtains the parallel rgb signal of each passage;
Lock unit, for described parallel rgb signal is carried out to Channel Synchronous processing, obtains the parallel rgb signal of low skew.
In one embodiment, on described circuit board, be also provided with the configuration module being connected with coding module respectively at decoder module, for decoder module and coding module are carried out respectively to parameter configuration.
The utility model can reduce the shake of signal by the balance module on circuit board, by decoder module, can reduce the skew of signal between different channels, by coding module, signal can be reverted to the DVI vision signal of transmitting in channel, thereby realized the recovery of DVI vision signal after the long Distance Transmission of low quality cable, make terminal can obtain the vision signal of low jitter, low skew, thereby guarantee the quality of terminal presentation facility epigraph; And DVI video signal transmission device has, and site operation is simple, overall plan price is lower, individual equipment can be supported 30 meters of above transmission ranges, and can make for increasing signal transmission distance by cascade, but also can support single-link and two kinds of mode of operations of dual link.
Accompanying drawing explanation
The structural representation of the DVI video signal transmission device embodiment that Fig. 1 provides for the utility model;
Fig. 2 is the structural representation of circuit board in Fig. 1;
Fig. 3 is the structural representation of balance module in Fig. 2;
Fig. 4 is the structural representation of decoder module in Fig. 2;
Fig. 5 is the structural representation of coding module in Fig. 2;
Fig. 6 is the structural representation that the utility model DVI video signal transmission device is applied to DVI Video transmission system;
Fig. 7 is the utility model DVI video signal transmission device application of the manystage cascade connection structural representation;
The flow chart of the DVI video-signal transmission method embodiment that Fig. 8 provides for the utility model;
Fig. 9 is the detail flowchart to DVI vision signal equilibrium treatment in Fig. 8;
Figure 10 is the detail flowchart that in Fig. 8, decoding is processed to DVI vision signal.
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with accompanying drawing, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.
The structural representation of the DVI video signal transmission device embodiment that Fig. 1 provides for the utility model, as shown in Figure 1, the device of the present embodiment, comprise: shell 1 and be arranged on the circuit board 2 in shell 1, on described circuit board 2, be provided with the balance module 21 connecting successively, decoder module 22 and coding module 23, described balance module 21 is connected with the input port 4 being arranged on shell 1, described input port 4 is for being connected with a DVI transmission link, described coding module 23 is connected with the output port 5 being arranged on shell 1, described output port 5 is for being connected with the 2nd DVI transmission link, described balance module 21, for the DVI vision signal that the DVI transmission link obtaining is transmitted, carry out equilibrium treatment, obtain transition minimized differential signaling (the Transition Minimized Differential Signaling of low jitter, be called for short TMDS), described decoder module 22, for described transition minimized differential signaling being carried out to string transforms decode processing, obtains the parallel rgb signal of low skew, described coding module 23, processes for the parallel rgb signal of described low skew being carried out to parallel-serial conversion coding, obtains the DVI vision signal of transmitting in the 2nd DVI transmission link.
Signal can be decayed in long Distance Transmission process, and the noise in channel also can cause clock signal or data-signal to change with respect to the phase place of canonical reference signal, be can produce the distorted signals such as shake and skew in signal transmission, these distorted signals phenomenons are especially serious in low-quality cable, and the transmission of the signal of low jitter and low skew contributes to reduce the error rate of transmission, improve the communication quality of high-speed serial communication.The DVI video signal transmission device that the present embodiment provides can recover to live again to the DVI vision signal through long Distance Transmission, reduce signal skew, the signal that makes DVI vision signal can grow Distance Transmission still has higher signal quality, thereby guarantees to be transferred to the signal quality on terminal presentation facility.
Specifically, input port 4 can with long distance D VI video signal transmission cable, the output of a DVI transmission link connects, it can receive the vision signal through the DVI of long Distance Transmission, the balance module 21 being connected with input port 4 can carry out equilibrium treatment to the DVI vision signal receiving, obtain the TMDS signal of low jitter, afterwards, by the processing of decoding of 22 pairs of these TMDS signals of the decoder module being connected with balance module 21, and carry out inter-channel synchronization, obtain the rgb signal of the low skew of interchannel, for the continuation of rgb signal after decoding is processed is transmitted in channel, also need be encoded by 23 pairs of rgb signals of the coding module being connected with decoder module 22, regenerate the DVI vision signal of transmitting for channel, finally this DVI vision signal is sent in the 2nd DVI transmission link by the output port 5 being connected with coding module 23, thereby the signal that completes DVI vision signal recovers to live again.
The present embodiment can reduce the shake of signal by the balance module 21 on circuit board 2, by decoder module 22, can reduce the skew of signal between different channels, by coding module 23, signal can be reverted to the DVI vision signal of transmitting in channel, thereby realized the recovery of DVI vision signal after the long Distance Transmission of low quality cable, make terminal can obtain the vision signal of low jitter, low skew, thereby guarantee the quality of terminal presentation facility epigraph.
In the embodiment shown in fig. 1, described balance module 21 also connects with the balanced selector switch 3 being arranged on shell 1, and described balanced selector switch 3, for according to the length of a described DVI transmission link cable, is selected balanced grade; Described balance module 21, the balanced grade of specifically selecting according to balanced selector switch 3 is carried out equilibrium treatment to described DVI vision signal, obtains the transition minimized differential signaling of low jitter.Balanced selector switch 3 can be selected balanced grade according to the length of different DVI video signal transmission cables, makes can both guarantee the quality of terminal presentation facility epigraph when different cable length transmission.
In the embodiment shown in fig. 1, on shell 1, also dispose input power port 6 and out-put supply port 7, the two is all connected with circuit board 2, input power port 6 can directly access civil power, for DVI video signal transmission device provides power supply, out-put supply port 7 can externally directly be exported civil power, can be to the DVI video signal transmission device of cascade or display device power supply.
Because the components and parts in modules on circuit board 2 will produce a large amount of heat at work, temperature raises and will be unfavorable for the normal performance of the function of components and parts, for making components and parts keep normal work, in the embodiment shown in fig. 1, on shell 1, also dispose fan 8, for circuit board 2 is carried out to radiating and cooling.On shell 1, also dispose window 9, window 9 can keep on shell interior circuit board inner air and outer air circulation, thereby fan 8 and window 9 provide good heat radiation for described DVI video signal transmission device.
DVI interface can be divided into single-link DVI and dual link DVI, single-link DVI can support bandwidth up to 165MHz, dual link DVI can support bandwidth up to 330MHz, the dual link DVI of take below describes as example, when adopting single-link DVI, the secondary link portions in figure be can close, as balance module and the coding module of secondary link closed.
Fig. 2 is the structural representation of circuit board in Fig. 1, Fig. 3 is the structural representation of balance module in Fig. 2, Fig. 4 is the structural representation of decoder module in Fig. 2, Fig. 5 is the structural representation of coding module in Fig. 2, as shown in Figure 2-5, the DVI vision signal of transmitting in long distance D VI cable is input to input port 4, wherein both comprised high speed analog signal TMDS Difference signal pair (D0+/D0-, D1+/D1-, D2+/D2-, D3+/D3-, D4+/D4-, D5+/D5-, C+/C-), also comprise low speed digital signal (+5V, hot plug detect HPD, DDC_CLK, DDC_DAT).Due to DVI standard definition two links: primary link and secondary link, two links share clock channel C +/C-, two links respectively comprise 3 data channel, primary link comprises D0+/D0-, D1+/D1-, D2+/D2-, secondary link comprises D3+/D3-, D4+/D4-, D5+/D5-.The balance module of primary link 3 circuit-switched data passages and clock passage input primary link, the clock passage of secondary link 3 circuit-switched data passages and the output of primary link balance module is inputted the balance module of secondary link, balance module can reopen the eye pattern window of TMDS signal effectively, makes up signal amplitude decline and Signal Degrade that signal brings when growing Distance Transmission by cable.The TMDS signal of the low jitter of obtaining after balance module conditioning is input to decoder module 22, TMDS signal is carried out to signal decoding, be converted to parallel rgb signal, each data channel is carried out to Channel Synchronous processing simultaneously, eliminate interchannel skew, parallel rgb signal is divided into two groups: dual pixel signal group (RE[7:0], GE[7:0] and BE[7:0]) and strange picture element signal group (RO[7:0], GO[7:0] and BO[7:0]).Two groups of signals are only exported one group of shared synchronizing signal: vertical synchronizing signal Vsync, horizontal-drive signal Hsync, clock signal clk and enable signal DE.Parallel rgb signal is inputted respectively the coding module of primary link and the coding module of secondary link, and the coding module of primary link and the secondary link rgb signal that will walk abreast is respectively converted to TMDS signal.Two-way coding module shares one group of synchronizing signal and clock signal, the coding module of dual pixel signal group input primary link, strange picture element signal group is inputted the coding module of secondary link, after coding module coding, can again obtain meeting the low skew of DVI standard, the TMDS signal of low jitter, improved the fault-tolerance of signal, last TMDS signal is through output port output.
26 pairs of DDCs of I2C driver module in Fig. 2 (Display Data Channel is called for short DDC) signal (DDC_CLK and DDC_DAT) drives again, so that its transmission range to be provided.Balanced selector switch 3 can be selected balanced grade according to the cable length in different DVI links, because grade is improper, can cause the decline of transmission performance.Decoder module 22, coding module 23 all needs to carry out parameter configuration could carry out optimization configuration to transmission performance, parameter configuration action need is completed by configuration module 24, therefore, on circuit board 2, be also provided with the configuration module 24 being connected with coding module 23 with decoder module 22 respectively, for decoder module 22 and coding module 23 are carried out respectively to parameter configuration with optimized transmission performance, this configuration module 24 can have microcontroller etc. to complete, configuration module 24 is also connected with positioning indicator 25, positioning indicator 25 can provide the state indication of channel, also can provide the indication of power supply status simultaneously.
Balance module 21 can comprise: the unit modules such as the first phase locked-loop unit 213, balanced unit 211, data recovery unit 212, the first phase locked-loop unit 213 wherein, for the clock signal in the DVI vision signal that the DVI transmission link obtaining is transmitted, carry out phase-locked processing, obtain the first sampled clock signal of low jitter; Balanced unit 211, carries out high frequency compensation processing for the data-signal in the DVI vision signal that the DVI transmission link obtaining is transmitted; Data recovery unit 212, is reference clock for take described the first sampled clock signal, and the data-signal after high frequency compensation is processed carries out data recovery, obtains the transition minimized differential signaling of low jitter.As shown in Figure 3, balance module can also comprise terminal resistance network, input buffer cell and for the output driver element of driver output, balanced unit 211 can compensate the every a pair of TMDS signal of input, improves its radio-frequency component, and its frequency response is contrary with the frequency response of DVI cable.The first phase locked-loop unit 213 can recover clock difference separated time centering the sampling clock of a road low jitter, supplies data recovery unit 212 conducts with reference to clock.Data recovery unit 212 independent actions carry out data recovery in each TMDS data channel, reduce the transmission shake of passage.Balance module 21 can reduce the signal jitter of clock and data simultaneously, and drives by output the TMDS signal that a low jitter is provided for subsequent conditioning circuit.
Decoder module 22 can comprise: the unit modules such as the second phase locked-loop unit 223, decoding unit 221 and lock unit 222, the second phase locked-loop unit 223 wherein, for the clock signal of described transition minimized differential signaling is carried out to phase-locked processing, obtain the second sampled clock signal; Decoding unit 221, is reference clock for take described the second sampling clock, respectively the data-signal of each passage in described transition minimized differential signaling is gone here and there and transforms decode is processed, and obtains the parallel rgb signal of each passage; Lock unit 222, for described parallel rgb signal is carried out to Channel Synchronous processing, obtains the parallel rgb signal of low skew.As shown in Figure 4, clock passage and data channel in TMDS signal are all sent to input sample unit, the sampling of realization to TMDS signal, the second phase locked-loop unit 223 can recover the sampling clock of a road low jitter in clock passage, can be used as the reference clock of decoding unit 223, the channel data that output obtains is sent into follow-up lock unit 222, lock unit 222 can complete passage and go skew, Channel Synchronous, pixel alignment function, thereby can improve the fault-tolerance of signal, raising is to second-rate cable with compared with the tolerance of adverse circumstances, the TMDS signal of the low jitter of balance module 21 outputs is decoded and synchronously after processing, is become parallel rgb signal through decoder module 22, this parallel rgb signal has lower skew.
The parallel rgb signal of the low skew of encoded module 22 outputs, must be through the coding of coding module 23 and the DVI signal that serialization could generate standard in order to revert to the DVI signal of standard.As shown in Figure 5, parallel rgb signal can obtain red (RED), green (GREEN) and blue (BLUE) three tunnel color data after data capture unit, sending into respectively coding unit encodes, coding adopts the 8B/10B coding that meets DVI standard, clock signal input the 3rd phase locked-loop unit, generate the reference clock signal of coding unit, the signal after coding is through exporting the externally DVI vision signal of outputting standard of driver element.
Fig. 6 is the structural representation that the utility model DVI video signal transmission device is applied to DVI Video transmission system, Fig. 7 is the utility model DVI video signal transmission device application of the manystage cascade connection structural representation, as shown in Figure 6 and Figure 7, the one DVI transmission link 101 is cables of a long distance transmission, its one end connects DVI video signal source 200, the interface at DVI video signal transmission device 100, the one DVI transmission link 101 two ends that other end connection the utility model provides is DVI interface.The 2nd DVI transmission link 102 is one section 10 meters following cables, the DVI video signal transmission device 100 that one termination the utility model provides, another termination DVI display device 300.DVI vision signal is sent to and in DVI video signal transmission device 100, is carried out signal and process the DVI vision signal of obtaining low jitter, low skew by a DVI transmission link 101 from DVI video signal source 200 sends, by the 2nd DVI transmission link 102, sending it to DVI display device 300, so that video image is shown, power supply line 103 in figure, can directly access civil power so that DVI video signal transmission device is powered.
If the DVI video signal transmission device 100 that does not use the utility model to provide, only 5 meters of distances between DVI video signal source and DVI display device, after the DVI video signal transmission device 100 that use the utility model provides, transmission range can be extended to more than 30 meters, and this distance has only been calculated the length of a DVI transmission link 101, if add the length of the 2nd DVI transmission link 102, distance will reach more than 40 meters.For convenience of using, the also integrated power module (not shown) that exchanges conversion direct current in the DVI video signal transmission device 100 that the utility model provides, externally fed input can directly be used alternating current 220V, simultaneously, can externally export 220V civil power, facilitate a plurality of equipment cascadings to use.Therefore, the DVI video signal transmission device 100 that the utility model provides has that site operation is simple, overall plan price is lower, individual equipment can be supported 30 meters of above transmission ranges, and can make for increasing signal transmission distance by cascade, but also can support single-link and two kinds of mode of operations of dual link.
The utility model can carry out signal transmission to list/dual link DVI vision signal, and high bandwidth can reach 330MHz, and data transfer rate can reach 9.9Gbps.Can support the DVI vision signal of the 3D display mode of 1920*1080@120Hz, by individual equipment, can make signal transmission distance by 5 meters of standard, expand to more than 30 meters, if carry out cascade, can also further extend its transmission range, thereby it is simple to have circuit, the advantages such as reliability is high, and cost is low, easy to use.
The flow chart of the DVI video-signal transmission method embodiment that Fig. 8 provides for the utility model, as shown in Figure 8, the operating procedure in the present embodiment method can be carried out by the DVI video signal transmission device of above-described embodiment, and its corresponding operating procedure comprises:
Step 801, obtain the DVI vision signal of transmitting in a DVI transmission link;
Step 802, described DVI vision signal is carried out to equilibrium treatment, obtain the transition minimized differential signaling of low jitter;
Step 803, described transition minimized differential signaling is carried out to string and transforms decode is processed, obtain the parallel rgb signal of low skew;
Step 804, the parallel rgb signal of described low skew is carried out to parallel-serial conversion coding process, obtain the DVI vision signal of transmitting in the 2nd DVI transmission link.
In the present embodiment, step 802 can the 21 pairs of DVI vision signals of balance module in said apparatus embodiment be carried out equilibrium treatment, obtain the transition minimized differential signaling of low jitter, step 803 can be processed by 22 pairs of described transition minimized differential signalings execution strings of decoder module transforms decode, obtain the parallel rgb signal of low skew, step 804 can be carried out by the parallel rgb signal of 23 pairs of described low skews of coding module the processing of parallel-serial conversion coding, obtains the DVI vision signal of transmitting in the 2nd DVI transmission link.DVI vision signal after processing by above-mentioned steps has the excellent properties of low jitter, low skew, therefore be conducive to guarantee to be transferred to the signal quality on terminal display, its operation principle of method in the present embodiment and the technique effect reaching and said apparatus embodiment are similar, are no longer described in detail.
Fig. 9 is the detail flowchart to DVI vision signal equilibrium treatment in Fig. 8, above-mentioned embodiment illustrated in fig. 8 in, step 802 can specifically comprise:
Step 8021, the clock signal in the DVI vision signal of transmitting in the DVI transmission link obtaining is carried out to phase-locked processing, obtain the first sampled clock signal of low jitter;
Step 8022, the data-signal in the DVI vision signal of transmitting in the DVI transmission link obtaining is carried out to high frequency compensation processing;
Step 8023, described the first sampled clock signal of take are reference clock, and the data-signal after high frequency compensation is processed carries out data recovery, obtains the transition minimized differential signaling of low jitter.
In above-mentioned steps, to data-signal carry out high frequency compensation process can be before the phase-locked processing of clock signal, carry out afterwards or simultaneously, be that sequencing the utility model that step 8021 and step 8022 are carried out does not specifically limit, by above-mentioned steps, can obtain clock signal and the data-signal of low jitter in transmission.
Figure 10 is the detail flowchart of in Fig. 8, DVI vision signal decoding being processed, above-mentioned embodiment illustrated in fig. 8 in, step 803 can specifically comprise:
Step 8031, the clock signal in described transition minimized differential signaling is carried out to phase-locked processing, obtain the second sampled clock signal;
Step 8032, described the second sampling clock of take are reference clock, respectively the data-signal of each passage in described transition minimized differential signaling are gone here and there and transforms decode processing, obtain the parallel rgb signal of each passage;
Step 8033, described parallel rgb signal is carried out to Channel Synchronous processing, obtain the parallel rgb signal of low skew.
In above-mentioned steps, first decoder module 22 carries out phase-locked processing to obtain reference clock to the clock signal in the TMDS signal after the balanced conditioning of balance module 21, then take this reference clock as benchmark, data-signal in TMDS signal is decoded to process and obtain rgb signal, because the rgb signal in each data channel exists channels offset, therefore decoder module 22 is last, also the rgb signal after decoding processing is synchronously processed, obtained the parallel rgb signal of low skew.
In the above-described embodiments, for making the DVI vision signal of transmitting length cables by difference can both obtain effective equilibrium treatment, balance module 21 is before carrying out equilibrium treatment to described DVI vision signal, the method of the present embodiment also comprises: according to the length of cable in a described DVI transmission link, select balanced grade, thereby make balance module 21 to described DVI vision signal, carry out equilibrium treatment according to the balanced grade of selecting, obtain the transition minimized differential signaling of low jitter.
In the above-described embodiments, for making decoder module 22 and coding module 23 be operated in best performance state, before described transition minimized differential signaling being carried out to string transforms decode processing, also comprise: decoder module 22 and coding module 23 are carried out respectively to parameter configuration with optimized transmission performance; Thereby make decoder module 22 to described transition minimized differential signaling, carry out string transforms decode processing according to parameter configuration, obtain the parallel rgb signal of low skew; Coding module 23 carries out parallel-serial conversion coding according to parameter configuration to the parallel rgb signal of described low skew to be processed, and obtains the DVI vision signal of transmitting in the 2nd DVI transmission link.
Finally it should be noted that: above embodiment is only in order to the technical solution of the utility model to be described but not be limited, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can be modified or be equal to replacement the technical solution of the utility model, and these modifications or be equal to replacement and also can not make amended technical scheme depart from the spirit and scope of technical solutions of the utility model.
Claims (5)
1. a DVI video signal transmission device, it is characterized in that, comprise: shell and setting circuit board in the enclosure, on described circuit board, be provided with the balance module, decoder module and the coding module that connect successively, described balance module is connected with the input port being arranged on shell, and described input port is for being connected with a DVI transmission link, and described coding module is connected with the output port being arranged on shell, described output port is for being connected with the 2nd DVI transmission link
Described balance module, carries out equilibrium treatment for the DVI vision signal that the DVI transmission link obtaining is transmitted, and obtains the transition minimized differential signaling of low jitter;
Described decoder module, for described transition minimized differential signaling being carried out to string transforms decode processing, obtains the parallel rgb signal of low skew;
Described coding module, processes for the parallel rgb signal of described low skew being carried out to parallel-serial conversion coding, obtains the DVI vision signal of transmitting in the 2nd DVI transmission link.
2. device according to claim 1, is characterized in that, described balance module also connects with the balanced selector switch being arranged on shell, and described balanced selector switch, for according to the length of a described DVI transmission link cable, is selected balanced grade;
Described balance module, specifically for according to the balanced grade of selecting, described DVI vision signal being carried out to equilibrium treatment, obtains the transition minimized differential signaling of low jitter.
3. device according to claim 1, is characterized in that, described balance module comprises:
The first phase locked-loop unit, carries out phase-locked processing for the clock signal in the DVI vision signal that the DVI transmission link obtaining is transmitted, and obtains the first sampled clock signal of low jitter;
Balanced unit, carries out high frequency compensation processing for the data-signal in the DVI vision signal that the DVI transmission link obtaining is transmitted;
Data recovery unit, is reference clock for take described the first sampled clock signal, and the data-signal after high frequency compensation is processed carries out data recovery, obtains the transition minimized differential signaling of low jitter.
4. device according to claim 1, is characterized in that, described decoder module comprises:
The second phase locked-loop unit, for the clock signal of described transition minimized differential signaling is carried out to phase-locked processing, obtains the second sampled clock signal;
Decoding unit, is reference clock for take described the second sampling clock, respectively the data-signal of each passage in described transition minimized differential signaling is gone here and there and transforms decode is processed, and obtains the parallel rgb signal of each passage;
Lock unit, for described parallel rgb signal is carried out to Channel Synchronous processing, obtains the parallel rgb signal of low skew.
5. according to the device described in any one in claim 1～4, it is characterized in that, on described circuit board, be also provided with the configuration module being connected with coding module with decoder module respectively, for decoder module and coding module are carried out respectively to parameter configuration.
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| CN103916619B (en) * | 2014-04-11 | 2017-02-15 | 公安部第一研究所 | DVI video signal transmission method and device |
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| CN103916619B (en) * | 2014-04-11 | 2017-02-15 | 公安部第一研究所 | DVI video signal transmission method and device |
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