CN104243873A - Transmission method and device for TMDS clock signal - Google Patents
Transmission method and device for TMDS clock signal Download PDFInfo
- Publication number
- CN104243873A CN104243873A CN201410485794.5A CN201410485794A CN104243873A CN 104243873 A CN104243873 A CN 104243873A CN 201410485794 A CN201410485794 A CN 201410485794A CN 104243873 A CN104243873 A CN 104243873A
- Authority
- CN
- China
- Prior art keywords
- tmds
- clock signal
- signal
- receiver
- clock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a transmission method and device for a TMDS clock signal. The technical problem that the wiring cost is high is solved. According to the method, two single-ended differential clock signals are superposed on common mode levels of differential signals of two sets of data signals respectively at the transmitting end to form a differential clock signal pair, and the received differential clock signal pair is combined to be the clock signal at the receiving end by the adoption of band-pass filtering. According to the device, a transmitter and a receiver are connected through three twisted-pairs and provided with two circuit structures, for transmitting the clock signal, of the twisted-pairs, and the receiver is provided with a band-pass filter. Compared with the prior art, all the data signals and the clock signal are transmitted only through three twisted-pairs, a remaining twisted-pair in a standard network cable can be used for transmitting a USB signal and other signals, transmission is stable and reliable, wiring difficulty is lowered, the wiring cost can be reduced by more than half.
Description
Technical field
The present invention relates to a kind of to Digital Visual Interface and/or the method for transmitting signals of high-definition media interface and the transmission method of device, particularly a kind of transition minimized differential signaling and device.
Background technology
Transition minimized differential signaling TMDS (Transition Minimized Differential Signaling) is a high speed transmission data technology of Silicon Image company of U.S. exploitation, can be used for the image transmitting to Digital Visual Interface DVI (Digital Visual Interface) and/or high-definition media interface HDMI (High-Definition Multimedia Interface).TMDS utilizes the voltage difference between 2 pins to carry out transmission signal, namely transmission of one line signal is carried out with one group of twisted-pair feeder, TMDS has 4 passages (Channel), need to transmit TMDS signal with 4 groups of twisted-pair feeders, wherein three groups of twisted-pair feeders are used for transmitting TMDS Data data-signal, other one group is used for transmitting TMDS Clock clock signal, and unified sequential required during to ensure to transmit, is generically and collectively referred to as 1 and connects or Single-link.
As shown in Figure 1, TMDS transmitter Tx receives the parallel data that graphics controller sends, and then encodes to parallel data and serialization process.RGB RGB or chromatism data and clock transmit with independent differential path respectively, altogether need 4 twisted-pair feeders to 4 passages formed, wherein, three groups of twisted-pair feeders are to difference transmitting R-G-B RGB or chromatism data signal TMDS Data, and 1 group of twisted-pair feeder is to transmit clock signal TMDS Clock.
TMDS receiver Rx receives serial data and clock, then carries out decoding process to serial data, exports parallel data and image clock, give display controller process.
According to DVI and the HDMI cable of DVI and HDMI normalized definition, the maximum length connecting TMDS Tx to TMDS Rx is less than 15 meters, but this distance is greater than 15 meters in many application scenarios, so there is a lot of DVI and/or HDMI (DVI/HDMI) extender in prior art.As shown in Figure 2, extender is provided with two boxes, one is extender transmitter (transmitting terminal, transmitter), be connected to the source equipment such as video card by DVI/HDMI line, another one is extender receiver (receiving terminal, receiver), be connected to the receiving device such as display or TV by DVI/HDMI line, connected by CAT5e/6 netting twine or DVI/HDMI line between transmitter and receiver.
DVI/HDMI extender utilizes special chip, carries out equilibrium, preemphasis and process of postemphasising to TMDS signal, by the transmission range of TMDS signal on CAT5e/6 netting twine or DVI/HDMI line, can extend to 30 ~ 50 meters.When using extender, CAT5e/6 netting twine or DVI/HDMI line transmit or TMDS signal, i.e. three groups of Double-strand transmission TMDS Data data-signals, one group of Double-strand transmission TMDS Clock clock signal, needs four groups of twisted-pair feeders altogether.There are four groups of twisted-pair feeders in the CAT5e/6 netting twine of a standard, just in time exhausted.
In some applications, except DVI/HDMI signal, also need other signals such as transmission USB, the way of prior art is the TMDS signal extended with a standard C AT5e/6 netting twine in DVI/HDMI, and an other standard C AT5e/6 netting twine extends usb signal; Also have a kind of way to be transmit with self-defining non-standard netting twine, as used the customization line of 5 groups of twisted-pair feeders to transmit, wherein 4 groups for transmitting TMDS signal, other one group of transmission usb signal.Which not only adds the cost of cable, also add the difficulty of wiring.
Summary of the invention
The object of this invention is to provide a kind of transmission method and device of TMDS clock signal, the technical problem that solve reduces wiring cost.
The present invention is by the following technical solutions: a kind of transmission method of TMDS clock signal, three groups of TMDS data-signals are transmitted from transmitting terminal to receiving terminal, at described transmitting terminal by single-ended for the two-way of TMDS clock signal differential clock signal, be superimposed upon on the common mode electrical level of the differential signal of two groups of TMDS data-signals in three groups of TMDS data-signals respectively, making the level signal of two common mode electrical levels form differential clock signal pair, adopting bandpass filtering by the differential clock signal received to synthesizing TMDS clock signal at described receiving terminal.
Amplify after method bandpass filtering of the present invention.
Method common mode electrical level of the present invention, in transformer-coupled circuit, is produced by the centre cap of Transformer Winding.
Method transformer of the present invention is separately positioned on transmitting terminal and receiving terminal.
Method common mode electrical level of the present invention, in capacity coupled circuit, is formed with the inductance be symmetrical arranged on the twisted-pair.
Method inductance of the present invention is separately positioned on transmitting terminal and receiving terminal.
A kind of transmitting device of TMDS clock signal, be provided with transmitter and receiver, through three groups of twisted pair line connections between transmitter and receiver, described transmitter and receiver are provided with the circuit structure of two groups of Double-strand transmission TMDSClock clock signals, and described receiver is provided with band pass filter.
Apparatus, with bandpass filter of the present invention is connected with amplifier.
Device circuit structure of the present invention is made up of with the primary centre cap being arranged on receiver the transformer secondary output centre cap being arranged on transmitter, the primary centre cap connecting band bandpass filter of receiver.
Device transmitter of the present invention is provided with three groups of transmitting terminal capacitors, receiver is provided with three groups of receiving terminal capacitors, described circuit structure is formed by being symmetricly set on inductance in parallel on transmitter and receiver two ends, twisted-pair feeder, the inductance connecting band bandpass filter of receiver.
The present invention compared with prior art, adopt multiplexing method signal transmission, TMDS Clock clock signal is superimposed upon on the TMDS Data data-signal of differential transfer, utilize the common mode electrical level of wherein any two groups of TMDS Data data-signals, transmit single-ended differential clock signal TMDS Clock+ and TMDSClock-respectively, the common mode electrical level of these two groups of TMDS Data data-signals forms a pair differential signal again, therefore only need to arrange filter and differential amplifier at receiving terminal, just can recover TMDS Clock clock signal well, thus only use three groups of twisted-pair feeders, just transmit all TMDS Data data-signals and TMDS Clock clock signal, remaining one group of twisted-pair feeder in straight through cable, can be used for transmitting other signals such as USB, like this by CAT5e/6 netting twine or the DVI/HDMI line of a standard, transmit other signals such as TMDS signal and USB simultaneously, transmit reliable and stable, reduce the difficulty of wiring, the wiring cost that can reduce by more than 50.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that TMDS transmits data.
Fig. 2 is the schematic diagram that extender TMDS transmits data.
Fig. 3 is the schematic diagram of extender of the present invention transmission TMDS signal and usb signal.
Fig. 4 is the schematic diagram of the embodiment of the present invention 1.
Fig. 5 is that the common mode electrical level of the embodiment of the present invention 1 follows clock signal change schematic diagram.
Fig. 6 is the schematic diagram of receiving terminal through the TMDS Data signal of reduction of the embodiment of the present invention 1.
Fig. 7 is the schematic diagram of the TMDS Clock+ signal that the receiving terminal of the embodiment of the present invention 1 takes out.
Fig. 8 is the schematic diagram of the TMDS Clock signal that the receiving terminal of the embodiment of the present invention 1 recovers.
Fig. 9 is the schematic diagram of the embodiment of the present invention 2.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.The transmission method of TMDS clock signal of the present invention, any two groups of twisted-pair feeders in three groups of twisted-pair feeders in transmission TMDS Data data-signal are utilized to transmit TMDS Clock clock signal, by three groups of TMDS Data data-signals from transmitting terminal to receiving terminal transmitting procedure, a pair single-ended differential clock signal in TMDS Clock clock signal is inputted respectively at transmitting terminal, be superimposed upon on the common mode electrical level of the differential data signals of two groups of TMDS Data data-signals, the level signal of two common mode electrical levels is made to form differential clock signal pair, bandpass filtering is adopted by the differential clock signal received to carrying out filtering at receiving terminal, then amplify, final reduction synthesis TMDS Clock clock signal.Following examples, by adopting transformer-coupled circuit and adopting capacity coupled circuit, illustrate the device of transmission method of the present invention and all employings thereof respectively.
Embodiment 1, as shown in Figure 4, in the transformer-coupled circuit of employing, utilizes the centre cap of Transformer Winding, transmits TMDS Clock clock signal.
By three groups of TMDS Data data-signals, adopt the mode of transformer alternating coupling to transmit to receiving terminal from transmitting terminal, utilize the centre cap of any two windings of transformer, transmission TMDS Clock differential clock signal.Three armature windings of transmitting terminal transformer input three groups of TMDS Data data-signals respectively.On the centre cap of any two secondary winding of transmitting terminal transformer, input the single-ended differential clock signal in TMDS Clock differential clock signal Zhong mono-tunnel (Single-endded Differential Signal) respectively, the i.e. centre cap transmission of one line single-ended differential clock signal TMDS Clock+ of a secondary winding, the centre cap of another secondary winding transmits another road single-ended differential clock signal TMDS Clock-, after single-ended differential clock signal is transferred to receiving terminal, from the centre cap of two windings of primary, extract a road single-ended differential clock signal TMDS Clock+ and another road single-ended differential clock signal T MDS Clock-respectively, then after filtering, amplify process, revert to TMDS Clock differential clock signal, with the TMDS Data data-signal that other three transformer secondary output windings are coupled out, be reduced into four groups of TMDS signals together, processed by subsequent conditioning circuit.Additional one group of twisted-pair feeder on standard C AT5e/6 netting twine or DVI/HDMI line, just can be used for other signals such as transmission USB, audio frequency, DDC, UART and various switching signals.
About TMDS signal, according to digital visual interface 1.0 editions (Digital Visual Interface Revision1.0, Digital Display Working Group, on April 2nd, 1999) definition (the TMDS Electrical Specification of the 4th chapter TMDS electrical code, 33-34 page, Fig. 4 .1, Fig. 4 .2 and Fig. 4 .3), the transmission principle that one group of TMDS differential lines is right is: on the solid wire that one group of twisted-pair feeder is right, transmit amplitude respectively identical, two single-ended differential signals that phase place is contrary, the common mode electrical level of these two single-ended differential signals is identical.After this group differential signal enters differential receiver, because differential receiver has very strong common-mode rejection ratio, so common-mode signal is removed, only remaining amplitude doubles the differential signal of 2*Vswing.
TMDS signal in DVI/HDMI has three groups of data and one group of clock, for convenience of description, three groups of data-signals are respectively TMDS Data0 (two-way single-ended differential data signals TMDS Data0+ and TMDS Data0-), TMDS Data1 (two-way single-ended differential data signals TMDS Data1+ and TMDS Data1-), TMDS Data2 (two-way single-ended differential data signals TMDS Data2+ and TMDS Data2-), one group of clock signal is TMDS Clock (two-way single-ended differential clock signal TMDS Clock+ and TMDS Clock-), the frequency of TMDS Clock clock signal is 1/10 of TMDS Data data-signal bit clock frequency.
In the method for the invention, by TMDS Data data-signal by after transformer coupled, on transformer secondary output, flip-flop is removed, the only alternating component of remaining TMDS Data data-signal, at this moment change the voltage of coupling transformer secondary centre tap, the common mode electrical level of the differential signal of TMDS Data data-signal can be changed.Because the symmetry of transformer center tap, make to be superimposed upon the voltage on transformer secondary output centre cap, can obtain identical common mode electrical level at transformer secondary output winding two ends, be conducive to follow-up differential receiver process, identical common mode electrical level can be removed completely by differential receiver.
When the level change of transformer center tap, the common mode electrical level of TMDS Data data-signal also changes thereupon.Below for TMDS Data1, introduce signal stacking method.At transmitting terminal, during the centre cap of the transformer secondary output of TMDS Clock+ signal input transmission TMDS Data1, as shown in Figure 5, the common mode electrical level of the two-way single-ended differential data signals TMDS Data1+ and TMDS Data1-of the TMDS Data data-signal that solid line represents, follow the road single-ended differential clock signal TMDS Clock+ that dotted line represents to change, two-way single-ended differential data signals TMDS Data1+ is identical all the time with the common mode electrical level of TMDS Data1-.
At receiving terminal, one tunnel single-ended differential clock signal TMDS Clock+ is equivalent to be added to the TMDS Data1+ common mode disturbances identical with amplitude on TMDS data1-, because TMDS Data1+ is identical with the common mode electrical level of superposition on TMDS Data1-, after differential signal receiver, common mode electrical level is completely removed, so as the TMDS Clock+ signal of common mode disturbances, will be removed by differential signal receiver, do not affect differential signal receiver and restore correct TMDS Data1 signal, as shown in Figure 6.In like manner, the single-ended differential clock signal in another road TMDS Clock-does not affect differential signal receiver yet and correctly restores an other road TMDS Data0 signal.
As shown in Figure 7, on the centre cap that receiving-end transformer is elementary, the common-mode signal of taking-up is TMDS Clock+ signal.
The twisted-pair feeder of the other one group of TMDS Data transmitted by transformer-coupled mode, to upper, adopted and is used the same method, and can transmit TMDS Clock-signal.
At receiving terminal, the TMDS Clock+ taken out respectively from primary centre cap and TMDS Clock-signal, form differential signal again, after differential filtering, amplification, as shown in Figure 8, reverts to correct TMDS Clock clock signal.
Like this, revert to the TMDS Clock clock signal of differential signal, the TMDS Data data-signal with other three transformer secondary output windings are coupled out, is reduced into four groups of TMDS signals together, is processed by subsequent conditioning circuit.Additional one group of twisted-pair feeder on standard C AT5e/6 netting twine or DVI/HDMI line, just can be used for other signals such as transmission USB.
There are four clock signals that are mutually related, respectively: pixel clock Pixel Clock, encoded clock or chip clock Character Clock, link clock Link Clock (TMDS Clock) and sampling clock Sampling Clock in whole TMDS link.These four clock signals are connected with corresponding drive circuit via phase-locked loop circuit PLL, TMDS receiver Rx shown in Fig. 1, utilize PLL that the link clock signal TMDS Clock being equal to pixel clock frequency is carried out ten frequency multiplication conversion, generate sampling clock, the inner sampled signal sampling clock of acquisition being divided into four kinds of phase places of TMDS receiver Rx, the TMDS Data data of input are sampled, thus realize four speed sampling 4 × Over Sampling, therefore, TMDS Clock is not the Direct Sampling clock of TMDS Data.
The device of the present embodiment, transmitting terminal transformer is provided with at extender transmitter (transmitter), receiving-end transformer is provided with at extender receiver (receiver), the elementary of secondary and receiving-end transformer of transmitting terminal transformer is connected through standard C AT5e/6 netting twine or DVI/HDMI line, and the centre cap of any two armature windings of receiving-end transformer connects filter and differential amplifier (filtering and amplifying circuit).Transmitting terminal transformer elementary for respectively input data signal TMDS Data0, TMDS Data1 and TMDS Data2, receiving-end transformer secondary for respectively outputting data signals TMDS Data0, TMDS Data1 and TMDS Data2, the centre cap of two secondary winding of transmitting terminal transformer is for inputting TMDS Clock clock signal, these two secondary winding be connected with filtering and be communicated with respectively with receiving-end transformer two armature windings of amplifying circuit, the centre cap of receiving-end transformer two armature windings exports TMDS Clock clock signal to filtering and amplifying circuit.
In the present embodiment, transmitting terminal and receiving terminal adopt the transformer of 10G BASE-T specification, CAT6 netting twine or CAT5e shielding netting wire is used to connect transmitting terminal and receiving terminal, receiving terminal filter adopts 25MHz ~ 165MHz band pass filter, by out-of-band noise filtering, amplifying circuit input impedance 1K ohm, output impedance 100 ohm, voltage gain is 5 times, the TMDS Clock clock signal recovered through above-mentioned filtering and amplifying circuit and transformer coupled data-signal TMDS Data out, give extender receiving chip MAX3815A together, utilize the full-automatic equalization function of MAX3815A, recover the standard TMDS signal meeting specification, thus the function realized with three groups of Double-strand transmission standard TMDS signals.
Embodiment 2, as shown in Figure 7, in the capacity coupled circuit of employing, the inductance be symmetrical arranged on the twisted-pair is utilized to form common mode electrical level, and TMDS Clock clock signal is added on TMDS Data data-signal by inductance and transmits, transmission method and embodiment 1 adopt the transmission method of transformer identical.
By three groups of TMDS Data data-signals, the mode of electric capacity AC coupled is adopted to transmit from transmitting terminal to receiving terminal, utilize the inductance on the symmetrical differential signal line be connected between transmitting terminal and receiving terminal respectively, TMDS Clock+ and TMDS Clock-signal are input on the differential data signals line of transmitting terminal two-way TMDS Data respectively, are transferred to receiving terminal.After sending-end inductance is connected in parallel on transmitting terminal electric capacity, receiving terminal inductance in parallel is before receiving terminal electric capacity.Three groups of TMDS Data data-signals are inputted respectively in three group capacitor one end of transmitting terminal.With any two groups in the differential signal line of three groups of TMDS Data data signal channels, transmit TMDS Clock+ and TMDS Clock-signal respectively, the other end of any two groups of three groups of transmitting terminal electric capacity is parallel with sending-end inductance respectively, be input on the differential signal line of one group of TMDS Data data-signal by a road single-ended differential clock signal TMDS Clock+ through sending-end inductance respectively, another road single-ended differential clock signal TMDS Clock-is input on the differential signal line of another group TMDS Data data-signal through sending-end inductance.After TMDS Clock+ and TMDS Clock-signal are transferred to receiving terminal, on the differential signal line of TMDS Data data signal channel, from being connected to the receiving terminal inductance before two groups of receiving terminal electric capacity, extract a road single-ended differential clock signal TMDS Clock+ and another road single-ended differential clock signal TMDS Clock-respectively, then after filtering, process is amplified, revert to TMDS Clock differential clock signal, with other three groups of capacitive coupling TMDS Data data-signal out, be reduced into four groups of TMDS signals together, processed by subsequent conditioning circuit.Additional one group of twisted-pair feeder on standard C AT5e/6 netting twine or DVI/HDMI line, just can be used for other signals such as transmission USB, audio frequency, DDC, UART and various switching signals.
In the present embodiment, appropriately choose the sensibility reciprocal of transmitting terminal and receiving terminal inductance, as 2.2uH, the impedance that inductance is formed relative to TMDS Data signal is more than the high impedance of 3K ohm, considerably beyond the line impedance of 100 ohm, so just can be implemented in receiving terminal and successfully extract TMDS Clock clock signal and TMDS Data data-signal.
The device of the present embodiment, three groups of transmitting terminal capacitors are provided with at extender transmitter, three groups of receiving terminal capacitors are provided with at extender receiver, transmitting terminal capacitor is connected through CAT6 netting twine or CAT5e shielding netting wire with receiving terminal capacitor, and one end (connecting that one end of CAT6 netting twine or CAT5e shielding netting wire) of any two group capacitors of receiving terminal connects filter and differential amplifier (filtering and amplifying circuit) through the receiving terminal inductance L 5-L8 of parallel connection.One end of transmitting terminal three group capacitor is used for input data signal TMDS Data0 respectively, TMDS Data1 and TMDS Data2, the other end outputting data signals TMDS Data0 respectively of receiving terminal three group capacitor, TMDS Data1 and TMDS Data2, the transmitting terminal two group capacitor other end (connecting that one end of CAT6 netting twine or CAT5e shielding netting wire) is parallel with sending-end inductance L1-L4, sending-end inductance L1-L4 is for inputting TMDS Clock clock signal, the other end of this two group capacitor is communicated with respectively with two the receiving terminal capacitors being parallel with receiving terminal inductance L 5-L8, receiving terminal inductance L 5-L8 exports TMDS Clock clock signal to filtering and amplifying circuit.
In the present embodiment, transmitting terminal capacitor and receiving terminal capacitor (coupling capacitance) are 0.01uF, to ensure the smooth transmission of TMDS signal, sending-end inductance and receiving terminal inductance are 2.2uH, CAT6 netting twine or CAT5e shielding netting wire is used to connect transmitting terminal capacitor and receiving terminal capacitor, receiving terminal filter adopts 25MHz ~ 165MHz band pass filter, by out-of-band noise filtering, amplifying circuit input impedance 1K ohm, output impedance 100 ohm, voltage gain is 5 times, the TMDS Clock signal recovered through above-mentioned filtering and amplifying circuit and by capacitive coupling TMDS Data signal out, give extender receiving chip MAX3815A together, utilize the full-automatic equalization function of MAX3815A, recover the standard TMDS signal meeting specification, realize the function with three groups of Double-strand transmission standard TMDS signals.
Method of the present invention, in order to transmit TMDS Clock clock signal, on the common mode electrical level of two-way TMDS Data differential data signals, superpose TMDS Clock+ and TMDS Clock-respectively, two common mode electrical level signals are utilized again to form Difference signal pair, when receiving terminal extracts TMDS Clock clock, use outer (beyond the TMDS Clock clock signal frequency) noise of the band of band pass filter filtering common mode signal, by two-way common-mode signal synthesis differential signal, like this, utilize the common-mode rejection properties of band pass filter and differential receiver, effectively reduce environment common-mode noise common in long range propagation to the interference of useful clock signal TMDS Clock.Method of the present invention solves the problem of common mold noise interference in TMDS transmission well, realizes TMDS Clock clock signal and passes through common mode transmission.The apparatus structure that the present invention adopts is simple, and reliably, cost is low for transmission, stable output.
Claims (10)
1. the transmission method of a TMDS clock signal, three groups of TMDS data-signals are transmitted from transmitting terminal to receiving terminal, it is characterized in that: at described transmitting terminal by single-ended for the two-way of TMDS clock signal differential clock signal, be superimposed upon on the common mode electrical level of the differential signal of two groups of TMDS data-signals in three groups of TMDS data-signals respectively, making the level signal of two common mode electrical levels form differential clock signal pair, adopting bandpass filtering by the differential clock signal received to synthesizing TMDS clock signal at described receiving terminal.
2. the transmission method of TMDS clock signal according to claim 1, is characterized in that: amplify after described bandpass filtering.
3. the transmission method of TMDS clock signal according to claim 1, is characterized in that: described common mode electrical level, in transformer-coupled circuit, is produced by the centre cap of Transformer Winding.
4. the transmission method of TMDS clock signal according to claim 3, is characterized in that: described transformer is separately positioned on transmitting terminal and receiving terminal.
5. the transmission method of TMDS clock signal according to claim 1, is characterized in that: described common mode electrical level, in capacity coupled circuit, is formed with the inductance be symmetrical arranged on the twisted-pair.
6. the transmission method of TMDS clock signal according to claim 5, is characterized in that: described inductance is separately positioned on transmitting terminal and receiving terminal.
7. the transmitting device of a TMDS clock signal, be provided with transmitter and receiver, through three groups of twisted pair line connections between transmitter and receiver, it is characterized in that: described transmitter and receiver are provided with the circuit structure of two groups of Double-strand transmission TMDS Clock clock signals, and described receiver is provided with band pass filter.
8. the transmitting device of TMDS clock signal according to claim 7, is characterized in that: described band pass filter is connected with amplifier.
9. the transmitting device of TMDS clock signal according to claim 8, it is characterized in that: described circuit structure is made up of with the primary centre cap being arranged on receiver the transformer secondary output centre cap being arranged on transmitter, the primary centre cap connecting band bandpass filter of receiver.
10. the transmitting device of TMDS clock signal according to claim 8, it is characterized in that: described transmitter is provided with three groups of transmitting terminal capacitors, receiver is provided with three groups of receiving terminal capacitors, described circuit structure is formed by being symmetricly set on inductance in parallel on transmitter and receiver two ends, twisted-pair feeder, the inductance connecting band bandpass filter of receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410485794.5A CN104243873A (en) | 2014-09-22 | 2014-09-22 | Transmission method and device for TMDS clock signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410485794.5A CN104243873A (en) | 2014-09-22 | 2014-09-22 | Transmission method and device for TMDS clock signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104243873A true CN104243873A (en) | 2014-12-24 |
Family
ID=52231117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410485794.5A Pending CN104243873A (en) | 2014-09-22 | 2014-09-22 | Transmission method and device for TMDS clock signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104243873A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110933333A (en) * | 2019-12-06 | 2020-03-27 | 河海大学常州校区 | Image acquisition, storage and display system based on FPGA |
| TWI692235B (en) * | 2019-03-08 | 2020-04-21 | 大陸商北京集創北方科技股份有限公司 | Half-duplex data transmission method and communication system using the same |
| CN111817928A (en) * | 2019-04-12 | 2020-10-23 | 苏州裕太微电子有限公司 | Enhanced 100Base-TX Ethernet design |
| CN111901012A (en) * | 2020-07-23 | 2020-11-06 | 深圳市奥拓电子股份有限公司 | Ethernet communication module and electronic system for simultaneously transmitting two signals |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426120A (en) * | 2008-10-23 | 2009-05-06 | 宁波奥科电子技术有限公司 | Method for expanding HDMI and/or DVI interface by single Ethernet cable for long distance connection |
| CN101931538A (en) * | 2010-09-01 | 2010-12-29 | 深圳市必联电子有限公司 | Capacitor coupling circuit and Ethernet network equipment |
| CN201928376U (en) * | 2010-12-22 | 2011-08-10 | 深圳市优特普科技有限公司 | Twisted pair video transmission device |
| TW201132109A (en) * | 2010-03-05 | 2011-09-16 | Aten Int Co Ltd | Transmitter, receiver and extender system |
| CN102684724A (en) * | 2011-03-15 | 2012-09-19 | 宏正自动科技股份有限公司 | Signal transmission device and transmitter and receiver thereof |
| CN202663366U (en) * | 2012-05-31 | 2013-01-09 | 上海大郡动力控制技术有限公司 | Filtering device for rotary transformer |
| US20130329828A1 (en) * | 2012-06-12 | 2013-12-12 | Silicon Image, Inc. | Simultaneous transmission of clock and bidirectional data over a communication channel |
-
2014
- 2014-09-22 CN CN201410485794.5A patent/CN104243873A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426120A (en) * | 2008-10-23 | 2009-05-06 | 宁波奥科电子技术有限公司 | Method for expanding HDMI and/or DVI interface by single Ethernet cable for long distance connection |
| TW201132109A (en) * | 2010-03-05 | 2011-09-16 | Aten Int Co Ltd | Transmitter, receiver and extender system |
| CN101931538A (en) * | 2010-09-01 | 2010-12-29 | 深圳市必联电子有限公司 | Capacitor coupling circuit and Ethernet network equipment |
| CN201928376U (en) * | 2010-12-22 | 2011-08-10 | 深圳市优特普科技有限公司 | Twisted pair video transmission device |
| CN102684724A (en) * | 2011-03-15 | 2012-09-19 | 宏正自动科技股份有限公司 | Signal transmission device and transmitter and receiver thereof |
| CN202663366U (en) * | 2012-05-31 | 2013-01-09 | 上海大郡动力控制技术有限公司 | Filtering device for rotary transformer |
| US20130329828A1 (en) * | 2012-06-12 | 2013-12-12 | Silicon Image, Inc. | Simultaneous transmission of clock and bidirectional data over a communication channel |
| WO2013188022A1 (en) * | 2012-06-12 | 2013-12-19 | Silicon Image, Inc. | Simultaneous transmission of clock and bidirectional data over a communication channel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI692235B (en) * | 2019-03-08 | 2020-04-21 | 大陸商北京集創北方科技股份有限公司 | Half-duplex data transmission method and communication system using the same |
| CN111817928A (en) * | 2019-04-12 | 2020-10-23 | 苏州裕太微电子有限公司 | Enhanced 100Base-TX Ethernet design |
| CN110933333A (en) * | 2019-12-06 | 2020-03-27 | 河海大学常州校区 | Image acquisition, storage and display system based on FPGA |
| CN111901012A (en) * | 2020-07-23 | 2020-11-06 | 深圳市奥拓电子股份有限公司 | Ethernet communication module and electronic system for simultaneously transmitting two signals |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8462759B2 (en) | Multi-media digital interface systems and methods | |
| US10169286B2 (en) | Devices and methods for providing reduced bandwidth DisplayPort communication | |
| KR101307011B1 (en) | Transmit, receive, and cross-talk cancellation filters for back channelling | |
| US9203597B2 (en) | Systems and methods for duplex communication | |
| US8213532B2 (en) | Information processing device and bidirectional transmission method | |
| CN101426120B (en) | Method for expanding HDMI and/or DVI interface by single Ethernet cable for long distance connection | |
| CN104243873A (en) | Transmission method and device for TMDS clock signal | |
| CN102547195A (en) | Electronic device, electronic device control method, and electronic device system | |
| US10193710B2 (en) | System for transmitting control signals over twisted pair cabling using common mode of transformer | |
| CN101420572B (en) | Implementing method for function of DP interface and television set | |
| TWI419545B (en) | Transmitter, receiver and extender system | |
| CN102684724B (en) | Signal transmission device and transmitter and receiver thereof | |
| CN106162228B (en) | Signal transmitting apparatus | |
| CN204089996U (en) | The transmitting device of TMDS clock signal | |
| CN103037222A (en) | Compression transmission device and method of parallel digital video signal | |
| CN209000510U (en) | It can cascade LED display control card | |
| CN102196226B (en) | Transmitter, receiver and signal extender system | |
| CN202435514U (en) | HDMI input wireless conversion device | |
| CN101799973A (en) | Signal transmission circuit and method | |
| EP2977982B1 (en) | Extender and method of recovering differential signal | |
| CN202652410U (en) | Video signal long-distance transmission apparatus | |
| CN202364224U (en) | Four-core optical fiber HDMI optical transceiver | |
| CN206650769U (en) | The device of single network cable transmission high definition HDMI signals | |
| CN206313864U (en) | A kind of OVER IP audio frequency and video extenders | |
| CN214045810U (en) | HDMI signal extension fixture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141224 |
|
| RJ01 | Rejection of invention patent application after publication |