CN207910906U - A kind of single cable extender of HDMI signals - Google Patents
A kind of single cable extender of HDMI signals Download PDFInfo
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- CN207910906U CN207910906U CN201721746488.8U CN201721746488U CN207910906U CN 207910906 U CN207910906 U CN 207910906U CN 201721746488 U CN201721746488 U CN 201721746488U CN 207910906 U CN207910906 U CN 207910906U
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Abstract
The utility model discloses a kind of single cable extenders of HDMI signals,Data transmission method includes receiving HDMI signals,And four pairs of differential signals in HDMI signals are ac-coupled on four pairs of twisted-pair feeders of single cable,Again by the SDA signal in HDMI signals,SCL signal and HPD signal are by the dc-couple of magnetic bead group on one or more signal wires,To realize single network cable transmission HDMI signals,The utility model completely supports a kind of implementation of the HDMI extenders of single cable of HDCP specifications,It can completely support the HDCP of HDMI interface to encrypt,EDID is transmitted,CEC is communicated,HPD is returned,And it can support IR remote controller signal return other than HDMI interface function,It can also support the wherein side of HDMI extenders supplying electricity to the other side,To reduce the mounting complexity of system installation,It can be with cost-effective.
Description
Technical field
The utility model is related to single cable extenders, more specifically, it is related to a kind of single cable extension of HDMI signals
Device.
Background technology
Due to some characteristics of HDMI signals and HDMI wire material, it is however generally that, HDMI wire when passing HDMI signals, line
Length is no more than 15 meters.But in practical applications, it often may require that HDMI signals can pass more farther.
In consideration of it, the product for occurring various HDMI long distance transmissions on the market is (simple behind for simple description,
Referred to as " HDMI extenders ", mainly based on wire transmission.Although being wirelessly transferred, line is simple, and anti-interference is poor, and cost
Height, market occupancy are extremely low.
For the product of the HDMI long distance transmissions of wire transmission, transmission range is being required》At=30 meters, can all it use
Cable transmits, and without being transmitted using HDMI wire, the reason is that the cost of cable is more, and can pass farther.
For in a variety of implementations for the HDMI extenders for using cable defeated, with using the connection type of double cables
Scheme is that technology is simplest, and product cost is low, but construct complicated (needing to be laid with two cables), and wire rod is adopted
Purchase cost is also high (because to use two cables).So occurring the implementation of a variety of single cables on the market at present, mainly
Have：
The scheme HDBaseT technologies of Velans companies of the U.S., such as VS100 schemes.VS100 schemes are complete transmission 1080P's
100 meters can be passed when HD video, support whole support HDCP encryptions, and have ultralow transmission delay.The scheme of Velans is
The scheme of industry best performance at present, but the disadvantage is that cost also highest.
The TF680 schemes of (Taifa) company and the HDbitT schemes of Xin Lianyang companies (ITE) are sent out by Taiwan Thailand；
Or the scheme of China's Mainland Rui Fake companies (norelsys), such as NS5530/NS5531 schemes.This 3 kinds of schemes are all HDMI
The transmitting terminal of extender first HDMI Signal Compressions are handled and are encoded after again by network cable transmission, reach connecing for HDMI extenders
Reverse process again after receiving end, is reduced to HDMI signals.Advantage is long transmission distance, in the full HD resolution ratio of 1080P up to 130
Rice, cost ratio Velans it is low it is upper very much；The disadvantage is that since video is through overcompression, clarity is slightly worse, and has certain transmission
Delay.
TMDS amplifies the remote transmission plan of integer, and the representative of this respect has：U.S.'s Maxim (Maxim)
The LT86102/LT86101 schemes of the Long Xun companies (lontium) of MAX3814/MAX3815 schemes or China's Mainland.This
Class scheme is after the TMDS in HDMI signals is amplified by transmitter, then by network cable transmission to receiving terminal, receiving terminal passes through
After the low-quality TMDS signals that one high performance reception chip transmits cable carry out integer amplification, it is reduced to normal
TMDS signals.The advantages of this kind of scheme, is that video does not compress, so clarity is high, and transmission delay is close to 0, at low cost, remote low
In above-mentioned two major classes scheme；The disadvantage is that transmission range is shorter, in the full HD resolution ratio of 1080P only up to 50 meters.And
The TMDS of network cable transmission is encrypted without HDCP, this does not just meet the confidentiality requirement of HDCP specifications.
Because this scheme by cable pass be directly just HDMI TMDS signals, and HDMI TMDS need 4 pairs of difference
Line i.e. 8 piece line transmits, and has thus just all occupied a cable.And HDMI must also have this several in normal work
A control signal could work：The channels DDC (channels DDC be by two signal line groups of SCL, SDA at), HPD, GND, 5V, so
In order to allow HDMI signal sources, HDMI display ends to work normally, it is subdivided into following several implementations:
An another plus cable carrys out special gate control signal (SCL, SDA, HPD, GND, 5V).The advantage of this scheme is can be complete
Whole support HDCP agreements the disadvantage is that wiring is complicated, while wanting two cables of cloth, and because a more cable integral into
This also rises.
TMDS signals are only passed between transmitter and receiver, do not transmit control signal.In order to make HDMI signal sources normal
TMDS signals are sent out, transmitter can take the method taken advantage of time, directly reply HPD, DDC signal to HDMI signal sources；Receiver is then
Directly show that equipment sends out 5V to HDMI, to allow HDMI to show equipment work.Also, in order to allow transmitter to be generated with receiver
One channel GND, so wanting
Because our utility models are a kind of inexpensive (cost than several schemes of front will be low), and completely prop up
A kind of implementation of the HDMI extenders of single cable of HDCP specifications is held, it can completely support the HDCP of HDMI interface to add
Close, EDID transmission, CEC communications, HPD passbacks, and can support the IR remote controller signal return other than HDMI interface function,
It can also support that (HDMI extenders are by transmitter and receiver the two independent individuals by the wherein sides of HDMI extenders
Composition) supply electricity to the other side (such as by transmitter by Power-over-Ethernet to receiver, or on the contrary supply electricity to send by receiver
Device), it, can be with cost-effective (saving a power supply adaptor) to reduce the mounting complexity of system installation.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of single cables of HDMI signals
Extender.
To achieve the above object, the utility model provides following technical solution：
A kind of single cable extender of HDMI signals, which is characterized in that including：Transmitting terminal, single cable and receiving terminal, institute
The input terminal for stating transmitting terminal is connect with the TMDS signal input parts of transmitting terminal chip, and the output end of the transmitting terminal passes through the list
Root cable is connect with the input terminal of the receiving terminal, the output end of the receiving terminal and the TMDS signal input parts of receiving terminal chip
Connection；
The single cable includes four pairs of twisted-pair feeders, four pairs of twisted-pair feeders be respectively first pair of twisted-pair feeder, second pair it is double
Twisted wire, third include two signal wires per a pair of twisted-pair feeder to twisted-pair feeder and the 4th pair of twisted-pair feeder：
The transmitting terminal includes：Eight ac coupling capacitors, the first magnetic bead group, the second magnetic bead group, third magnetic bead group and four
A resistance group：
One end of each ac coupling capacitor is connected with the TMDS signal input parts of the transmitting terminal chip, the other end
One end for connecting a signal wire, for realizing first pair of differential signal, second pair of differential signal, third to differential signal
With the AC coupled of the 4th pair of differential signal；
Four resistance components are not connect with the TMDS signal input parts of the transmitting terminal chip, a resistance group connection
The TMD signal input parts of a pair of transmitting terminal chip, each resistance group include two resistance, and the one of two resistance
End is connected and is connected to first voltage source, and the other end of two resistance is separately connected the TMDS of a pair of transmitting terminal chip
Signal input part；
The first magnetic bead group includes one or two isolation magnetic beads and a device that high impedance is presented to high-frequency signal
Part, described isolation magnetic bead one end is connected by the way that the device of high impedance is presented to high-frequency signal with the input terminal of HDMI signals, another
End is separately connected one or more signal wires, for realizing the dc-couple of SDA signal；
The second magnetic bead group includes one or two isolation magnetic beads and a device that high impedance is presented to high-frequency signal
Part, described isolation magnetic bead one end is connected by the way that the device of high impedance is presented to high-frequency signal with the input terminal of HDMI signals, another
End is separately connected one or more signal wires, for realizing the dc-couple of SCL signal；
The third magnetic bead group include two isolation magnetic beads, two it is described isolation magnetic beads one end be separately connected one or
More signal wires, the other end are grounded after being connected；
The receiving terminal includes:Eight isolation capacitances, the 4th magnetic bead group, the 5th magnetic bead group, the 6th magnetic bead group and four connect
Ground resistance group；
One end of each isolation capacitance is connected with the TMDS signal input parts of the receiving terminal chip, other end connection
One end of a piece signal wire is used for transmission first pair of differential signal, second pair of differential signal, the third pair
Differential signal and the 4th pair of differential signal；
The four grounded resistance component is not connect with the TMDS signal input parts of the receiving terminal chip, a ground connection electricity
The TMDS signal input parts of a pair of receiving terminal chip of resistance group connection, each ground resistance group include two ground connection electricity
Resistance, one end of two ground resistances are connected and are grounded, and the other end of two ground resistances is respectively connected to a pair of of institute
State the TMDS signal input parts of receiving terminal chip；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead is by believing high frequency
Number present high impedance device be connected with the output end of HDMI signals, the other end is connected to one or more signal wires
On, for realizing the separation and output of SCL signal；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead is by believing high frequency
Number present high impedance device be connected with the output end of HDMI signals, the other end is connected to one or more signal wires
On, for realizing the separation and output of SDA signal；
The 5th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead is by believing high frequency
Number present high impedance device be connected with the output end of HDMI signals, the other end is connected to one or more signal wires
On, for realizing the separation and output of SCL signal；
The 6th magnetic bead group include one or two isolation magnetic beads, be isolated magnetic bead one end be connected to one or
On more signal wires of person, other end ground connection.
The utility model tool has the advantage that：The utility model completely supports a kind of HDMI of single cable of HDCP specifications to prolong
The implementation of long device, it can completely support the HDCP of HDMI interface to encrypt, EDID transmission, CEC is communicated, HPD is returned,
And can support IR remote controller signal return other than HDMI interface function, it can also support wherein the one of HDMI extenders
Side (HDMI extenders are made of transmitter and receiver the two independent individuals) supplies electricity to the other side (such as by sending
Device by Power-over-Ethernet to receiver, or otherwise transmitter supplied electricity to by receiver), it is complicated with the installation for reducing system installation
Property can save a power supply adaptor with cost-effective.
Description of the drawings
Fig. 1 is a kind of number for single cable extender transmitting terminal applied to HDMI signals that the utility model embodiment provides
According to transfer process figure.
Fig. 2 is a kind of number for single cable extender receiving terminal applied to HDMI signals that the utility model embodiment provides
According to transfer process figure.
Fig. 3 is the electricity that the utility model list cable transmits the infrared IR+Power transmission of HDMI (containing SDA, SCL, HPD)+CEC+
Realize block diagram in road.
Fig. 4 is single cable extender structural schematic diagram of the first HDMI signal of the utility model.
Fig. 5 is single cable extender structural schematic diagram of second of HDMI signal of the utility model.
Fig. 6 is single cable extender structural schematic diagram of the third HDMI signal of the utility model.
Fig. 7 is single cable extender structural schematic diagram of the 4th kind of HDMI signal of the utility model.
Fig. 8 is single cable extender structural schematic diagram of the 5th kind of HDMI signal of the utility model.
Fig. 9 is single cable extender structural schematic diagram of the 6th kind of HDMI signal of the utility model.
Specific implementation mode
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
In the description of the present invention, it should be understood that term "center", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable
The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the utility model and simplify description, specific side must be had by not indicating or implying the indicated device or element
Position, with specific azimuth configuration and operation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.The meaning of " plurality " is two or two in the description of the present invention,
More than, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be
Mechanical connection can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two
The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it
"lower" may include that the first and second features are in direct contact, and can also not be to be in direct contact but lead to including the first and second features
Cross the other characterisation contact between them.Moreover, fisrt feature second feature " on ", " top " and " above " include the
One feature is right over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.First is special
Sign second feature " under ", " lower section " and " below " include fisrt feature immediately below second feature and obliquely downward, or only
Indicate that fisrt feature level height is less than second feature.
Referring to Fig.1 shown in-Fig. 9, the specific implementation process of following five embodiments is elaborated.
Embodiment one
A kind of data transmission method of the present embodiment is applied to the transmitting terminal of single cable extender of HDMI signals, described
Data transmission method includes：
The HDMI signals that HDMI signal input parts are sent are received, the HDMI signals include encrypted TMDS signals, described
TMDS signals include first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair of differential signal；
First pair of differential signal, second pair of differential signal, third pass through friendship to differential signal, the 4th pair of differential signal
Stream coupled modes are loaded into respectively on eight signal wires of a cable, and two signal wires are answered per a pair of Difference signal pair；
SDA signal in the HDMI signals is loaded into one or more described signal wires by dc-couple mode
On；
SCL signal in the HDMI signals is loaded into one or more described signal wires by dc-couple mode
On；
HPD signal in the HDMI signals is loaded into one or more described signal wires by dc-couple mode
On.
The receiving terminal of single cable extender applied to HDMI signals, the data transmission method include：
Receive the coupling SDA signal that the transmitting terminal of the mono- cable extenders of HDMI sends, SCL signal or HPD signal the
A pair of of differential signal, second pair of differential signal, third are to differential signal, the 4th pair of differential signal；
By SDA signal, SCL signal or HPD signal and described first pair of differential signal, second pair of differential signal,
Three pairs of differential signals, the 4th pair of differential signal separation；
By the SDA signal the isolated, SCL signal, the HPD signal, first pair of differential signal, described
Second pair of differential signal, the third to differential signal, the 4th pair of differential signal through the receiving terminal processing after export to
The output end of HDMI signals.
By SCL, SDA, the two signals have had transmission by the way that the device of high impedance is presented to high-frequency signal and is added to respectively
In 1 of TMDS signals or many netting twines.
The cable quantity that SCL, SDA are respectively used is unlimited, as long as there is enough cables that can use, as SCL can be used
One, SDA is with two (arbitrary two, be not necessarily with two in a pair of of twisted-pair feeder)；It will be sent to what cable got on
SCL, SDA signal are needed first to carry out signal enhancing, could be sent to by magnetic bead on cable, cannot directly be met HDMI
SCL, SDA that mouth is sent are added to by magnetic bead on cable, this is because：Cable can be long, each line between that cable
Between distribution capacity can be bigger, reach nF ranks；And every cable transmitter and receiver-side it is all each there are one every
Straight capacitance can allow the signal of SCL, SDA can not so these capacitances can seriously cut the voltage change speed of about SCL or SDA signal
It is correctly validated, to communication failure；For SDA signal, it is two-way, and neither one is used to indicate transmission side
To indication signal, so to its signal enhancing being compared because of difficult thing；This just needs one can fit level signal biography automatically
Then the circuit in defeated direction carries out the signal enhancing of corresponding direction according to present transmission direction；For SCL signal,
It is similarly two-way, and neither one is used to indicate the indication signal of transmission direction, so the signal enhancing to it is
Compare because of difficult thing；This just needs a circuit that can fit level signal transmission direction automatically, then according to present transmission side
Always the signal enhancing of corresponding direction is carried out；But in practice, unidirectional also possible, this direction is exactly the level of SCL
Always determined by sender side；For the signal enhancing of SCL, SDA, enhanced signal can be same phase with input signal
, can also be reverse phase, and voltage amplitude can also be completely different；Such as the SDA of the HDMI interface in transmitter
High level amplitude be 5V, and can be enhancing only in terms of electric current without making to voltage amplitude by enhanced SDA
It is required that, that is to say, that even if the voltage of enhanced high level is 1V, low level is 0.5V also possible, as long as it can be incited somebody to action
The signal of input can quickly be transmitted to the other end of cable, and can be connect correct identification.
HPD signal can also be superimposed by magnetic bead on cable；HPD is to be sent to sender side from receiver-side, it can be with
It is directly to be superimposed with TMDS, can also be to be superimposed again with TMDS after voltage transformation, the mode of voltage transformation includes but unlimited
In：Reverse phase, level translation (such as high level is 3V, low level 1V), carrier modulation (such as AM, FM, ASK, FSK)；HPD can be
Only be added on a cable, can also simultaneously be added in arbitrary many netting twines (if be added to two cables when, not
It is limited to be added to in the both threads in a pair of of twisted-pair feeder)；HPD can wherein appoint with SCL, SDA, CEC, infrared remote control
One signal of meaning is superimposed once again, such as after HPD is superimposed with SDA, then is added on one or more cable by magnetic bead.Because
HPD is a direct current signal, and SDA or SCL are a low frequency signals (about 100KHz).Once in this way, this is folded
The cable for having added HPD+SDA, by a minimum of 3 kinds of different level values, such as：>4.5V indicates the HPD of input for low level (i.e.
HPD signal is inverted)；About 2.5V indicates that the HPD of input is high level, and SDA is also high level state；<0.5V is indicated defeated
The HPD entered is Gao Ping, and SDA is low level state.
Theoretically, HPD shares 4 kinds of different assembled states with the high level everywhere in SDA, low level combine, and on
Face only embodies 3 kinds, this is because in HDMI, only HPD is that height usually just indicates that HDMI shows that equipment has access, at this moment
It needs to be communicated with display equipment by SCL, SDA；The above voltage value is an example, can essentially use difference
Voltage value indicate the state of some signal.
If in certain a pair of of twisted-pair feeder, the signal that its both threads are superimposed is different, then receiver end every
After straight capacitance, it is possible to need the low frequency signal being superimposed to TMDS signals in high impedance but to this to twisted-pair feeder with one or directly
Low-impedance circuit (such as inductance/magnetic bead/inductance+magnetic bead) is presented to eliminate crosstalk of the low frequency signal to TMDS in stream signal.
Embodiment two
A kind of data transmission method is applied to the transmitting terminal of single cable extender of HDMI signals, the transmission side data
Method includes：
The HDMI signals that HDMI signal input parts are sent are received, the HDMI signals include encrypted TMDS signals, described
TMDS signals include first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair of differential signal；
First pair of differential signal, second pair of differential signal, third pass through friendship to differential signal, the 4th pair of differential signal
Stream coupled modes are loaded into respectively on eight signal wires of a cable, and two signal wires are answered per a pair of Difference signal pair；
CEC signals are loaded by dc-couple mode on one or more described signal wires.
The receiving terminal of single cable extender applied to HDMI signals, the data transmission method include：
Receive the mono- cable extenders of HDMI transmitting terminal send coupling CEC signals first pair of differential signal, second pair
Differential signal, third are to differential signal, the 4th pair of differential signal；
By CEC signals and described first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair
Differential signal detaches；
By the CEC signals isolated, first pair of differential signal, second pair of differential signal, the third
Differential signal, the 4th pair of differential signal are exported after receiving terminal processing to the output end of HDMI signals.
CEC signals there is 1 of transmission TMDS signals by the way that the device of high impedance is presented to high-frequency signal and is added to
Or in many netting twines；For CEC signals, if cable is long, the distribution capacity between each line between that cable
Can be bigger, reach nF ranks；And every cable transmitter and receiver-side it is all each there are one capacitances, so these
Capacitance can seriously cut the voltage change speed of about CEC signals, can allow CEC signals that can not be correctly validated, to communication failure, institute
To need first to carry out signal enhancing to transmit again；For CEC signals, it is two-way, and neither one is used to indicate biography
The indication signal in defeated direction, so to its signal enhancing being compared because of difficult thing；This just needs one can fit automatically not believe
The circuit of number transmission direction, then carries out the signal enhancing of corresponding direction according to present transmission direction；For the signal of CEC
Enhancing, enhanced signal can be same phase with input signal, can also be reverse phase, and voltage amplitude can also be complete
It is different；Such as the high level amplitude of the CEC in the HDMI interfaces of transmitter is 3.3V, and passing through enhanced CEC can
To be enhancing only in terms of electric current without being required to voltage amplitude, that is to say, that even if the voltage of enhanced high level is
1V and low level are that 0.5V is also possible, if the signal of input can be quickly transmitted to the other end of cable by it, and
Correct identification can be connect.
CEC can be transmitted only with any one of 8 lines in cable, can also be simultaneously by its in this 8
In several transmit, as long as there is enough cables that can use.Such as with two (arbitrary two, be not necessarily with a pair
Two in twisted-pair feeder) or 3.
If in certain a pair of of twisted-pair feeder, the signal that its both threads are superimposed is different, then receiver end every
After straight capacitance, it is possible to need the low frequency signal being superimposed to TMDS signals in high impedance but to this to twisted-pair feeder with one or directly
Low-impedance circuit (such as inductance/magnetic bead/inductance+magnetic bead) is presented to eliminate crosstalk of the low frequency signal to TMDS in stream signal.
Embodiment three
A kind of data transmission method is applied to the transmitting terminal of single cable extender of HDMI signals, the transmission side data
Method includes：
The HDMI signals that HDMI signal input parts are sent are received, the HDMI signals include encrypted TMDS signals, described
TMDS signals include first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair of differential signal；
First pair of differential signal, second pair of differential signal, third pass through friendship to differential signal, the 4th pair of differential signal
Stream coupled modes are loaded into respectively on eight signal wires of a cable, and two signal wires are answered per a pair of Difference signal pair；
Infrared remote-controlled signal is loaded by dc-couple mode on one or more described signal wires.
The receiving terminal of single cable extender applied to HDMI signals, the data transmission method include：
It receives the coupling of the transmitting terminal transmission of the mono- cable extenders of HDMI or is superimposed first pair of difference of infrared remote-controlled signal
Sub-signal, second pair of differential signal, third are to differential signal, the 4th pair of differential signal；
By infrared remote-controlled signal and described first pair of differential signal, second pair of differential signal, third to differential signal,
Four pairs of differential signal separation；
By output after the infrared remote-controlled signal isolated processing to infrared signal sending device.
Infrared remote-controlled signal (lower abbreviation IR signals) can also be superimposed by magnetic bead on cable；IR signals are connect from infrared
It receives device side and infrared transmitter side is sent to by cable, it can be directly superimposed with TMDS, can also be to become through overvoltage
It is superimposed again with TMDS after changing, the mode of voltage transformation includes but not limited to：(such as high level is 3V, low level for reverse phase, level translation
For 1V), carrier modulation (such as AM, FM, ASK, FSK)；
IR signals can be only added on a cable, can also simultaneously be added in arbitrary many netting twines (if
Be added to two cables when, however it is not limited to can only be added to in the both threads in a pair of of twisted-pair feeder)；
IR signals can be once again superimposed with CEC signals, such as after IR signals and CEC Signal averagings, then be superimposed by magnetic bead
Onto one or more cable.Once using this stacked system, this has been superimposed on the cable of IR+CEC signals, will be a minimum of
3 kinds of different level values, such as：>4.5V indicates to receive IR signals；About 2.5V, expression are not received by IR signals, CEC letters
Number remain high level；<0.5V, expression CEC signals are low level.
The above voltage value is an example, and the shape of some signal can essentially be indicated using different voltage values
State.
If in certain a pair of of twisted-pair feeder, the signal that its both threads are superimposed is different, then receiver end every
After straight capacitance, it is possible to need the low frequency signal being superimposed to TMDS signals in high impedance but to this to twisted-pair feeder with one or directly
Low-impedance circuit (such as inductance/magnetic bead/inductance+magnetic bead) is presented to eliminate crosstalk of the low frequency signal to TMDS in stream signal.
Example IV
A kind of data transmission method is applied to the transmitting terminal of single cable extender of HDMI signals, the transmission side data
Method includes：
The HDMI signals that HDMI signal input parts are sent are received, the HDMI signals include encrypted TMDS signals, described
TMDS signals include first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair of differential signal；
First pair of differential signal, second pair of differential signal, third pass through friendship to differential signal, the 4th pair of differential signal
Stream coupled modes are loaded into respectively on eight signal wires of a cable, and two signal wires are answered per a pair of Difference signal pair；
Power supply is loaded by dc-couple mode on one or more described signal wires.
The receiving terminal of single cable extender applied to HDMI signals, the data transmission method include：
Receive the coupling or be superimposed first pair of differential signal of power supply, that the transmitting terminals of the mono- cable extenders of HDMI is sent
Two pairs of differential signals, third are to differential signal, the 4th pair of differential signal；
By power supply and described first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair of difference
Signal separator；
By output after the power supply isolated processing to power supply receiving terminal.
Power supply transmitting function：Power supply can be by cable, by the other end of the power supply transmission cable of external power supply.
Wherein one or more progress power delivery in cable can be utilized；If be transmitted using 2, also not
It is in a pair of of twisted-pair feeder centainly to require this two.
It is opposite with external voltage by the voltage of network cable transmission, can identical, higher, or it is lower can, do not limit
It is fixed；
It can be that external power supply is connected to transmitter, receiver then to is sent power supply by cable；It can also be outside
Power supply is connected to receiver, then sends power supply to transmitter by cable；
As the side for sending power supply, it cannot directly pass through cable power transmission；It needs to send out a supply current in advance<10mA
Voltage to the power port of cable on, then accessed by a certain or many netting twines to detect the other side, and to spy
Fixed back-signalling could formal power transmission to cable；This specific back-signalling includes but not limited to：Certain root or many netting twines
Specific voltage is presented, or some specific wave mode is presented；
The side for sending power supply, can determine to send out different voltage according to the difference of back-signalling.
If in certain a pair of of twisted-pair feeder, the signal that its both threads are superimposed is different, then receiver end every
After straight capacitance, it is possible to need the low frequency signal being superimposed to TMDS signals in high impedance but to this to twisted-pair feeder with one or directly
Low-impedance circuit (such as inductance/magnetic bead/inductance+magnetic bead) is presented to eliminate crosstalk of the low frequency signal to TMDS in stream signal.
Embodiment five
A kind of single cable extender of HDMI signals is present embodiments provided, including：Transmitting terminal, single cable and reception
End, the input terminal of the transmitting terminal are connect with the TMDS signal input parts of transmitting terminal chip, and the output end of the transmitting terminal passes through
The single cable is connect with the input terminal of the receiving terminal, the output end of the receiving terminal and the TMDS signals of receiving terminal chip
Input terminal connects；
The single cable includes four pairs of twisted-pair feeders, four pairs of twisted-pair feeders be respectively first pair of twisted-pair feeder, second pair it is double
Twisted wire, third include two signal wires per a pair of twisted-pair feeder to twisted-pair feeder and the 4th pair of twisted-pair feeder：
The transmitting terminal includes：Eight ac coupling capacitors, the first magnetic bead group, the second magnetic bead group, third magnetic bead group and four
A resistance group：
One end of each ac coupling capacitor is connected with the TMDS signal input parts of the transmitting terminal chip, the other end
One end for connecting a signal wire, for realizing first pair of differential signal, second pair of differential signal, third to differential signal
With the AC coupled of the 4th pair of differential signal；
Four resistance components are not connect with the TMDS signal input parts of the transmitting terminal chip, a resistance group connection
The TMD signal input parts of a pair of transmitting terminal chip, each resistance group include two resistance, and the one of two resistance
End is connected and is connected to first voltage source, and the other end of two resistance is separately connected the TMDS of a pair of transmitting terminal chip
Signal input part；
The first magnetic bead group includes one or two isolation magnetic beads and a device that high impedance is presented to high-frequency signal
Part, described isolation magnetic bead one end is connected by the way that the device of high impedance is presented to high-frequency signal with the input terminal of HDMI signals, another
End is separately connected one or more signal wires, for realizing the dc-couple of SDA signal；
The second magnetic bead group includes one or two isolation magnetic beads and a device that high impedance is presented to high-frequency signal
Part, described isolation magnetic bead one end is connected by the way that the device of high impedance is presented to high-frequency signal with the input terminal of HDMI signals, another
End is separately connected one or more signal wires, for realizing the dc-couple of SCL signal；
The third magnetic bead group include two isolation magnetic beads, two it is described isolation magnetic beads one end be separately connected one or
More signal wires, the other end are grounded after being connected；
The receiving terminal includes:Eight isolation capacitances, the 4th magnetic bead group, the 5th magnetic bead group, the 6th magnetic bead group and four connect
Ground resistance group；
One end of each isolation capacitance is connected with the TMDS signal input parts of the receiving terminal chip, other end connection
One end of a piece signal wire is used for transmission first pair of differential signal, second pair of differential signal, the third pair
Differential signal and the 4th pair of differential signal；
The four grounded resistance component is not connect with the TMDS signal input parts of the receiving terminal chip, a ground connection electricity
The TMDS signal input parts of a pair of receiving terminal chip of resistance group connection, each ground resistance group include two ground connection electricity
Resistance, one end of two ground resistances are connected and are grounded, and the other end of two ground resistances is respectively connected to a pair of of institute
State the TMDS signal input parts of receiving terminal chip；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead is by believing high frequency
Number present high impedance device be connected with the output end of HDMI signals, the other end is connected to one or more signal wires
On, for realizing the separation and output of SCL signal；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead is by believing high frequency
Number present high impedance device be connected with the output end of HDMI signals, the other end is connected to one or more signal wires
On, for realizing the separation and output of SDA signal；
The 5th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead is by believing high frequency
Number present high impedance device be connected with the output end of HDMI signals, the other end is connected to one or more signal wires
On, for realizing the separation and output of SCL signal；
The 6th magnetic bead group include one or two isolation magnetic beads, be isolated magnetic bead one end be connected to one or
On more signal wires of person, other end ground connection.
The above is only the preferred embodiment of the utility model, and the scope of protection of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the scope of protection of the utility model.It should refer to
Go out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (1)
1. a kind of single cable extender of HDMI signals, which is characterized in that including：Transmitting terminal, single cable and receiving terminal, it is described
The input terminal of transmitting terminal is connect with the TMDS signal input parts of transmitting terminal chip, and the output end of the transmitting terminal passes through described single
Cable is connect with the input terminal of the receiving terminal, and the output end of the receiving terminal connects with the TMDS signal input parts of receiving terminal chip
It connects；
The single cable include four pairs of twisted-pair feeders, four pairs of twisted-pair feeders be respectively first pair of twisted-pair feeder, second pair of twisted-pair feeder,
Third includes two signal wires per a pair of twisted-pair feeder to twisted-pair feeder and the 4th pair of twisted-pair feeder：
The transmitting terminal includes：Eight ac coupling capacitors, the first magnetic bead group, the second magnetic bead group, third magnetic bead group and four electricity
Resistance group：
One end of each ac coupling capacitor is connected with the TMDS signal input parts of the transmitting terminal chip, other end connection
One end of a piece signal wire, for realizing first pair of differential signal, second pair of differential signal, third to differential signal and
The AC coupled of four pairs of differential signals；
Four resistance components are not connect with the TMDS signal input parts of the transmitting terminal chip, and a resistance group connection is a pair of
The TMD signal input parts of the transmitting terminal chip, each resistance group include two resistance, one end phase of two resistance
Connect and be connected to first voltage source, the other end of two resistance is separately connected the TMDS signals of a pair of transmitting terminal chip
Input terminal；
The first magnetic bead group includes one or two isolation magnetic beads and a device that high impedance is presented to high-frequency signal, institute
It states isolation magnetic bead one end and is connected with the input terminal of HDMI signals by the way that the device of high impedance is presented to high-frequency signal, other end difference
One or more signal wires are connected, for realizing the dc-couple of SDA signal；
The second magnetic bead group includes one or two isolation magnetic beads and a device that high impedance is presented to high-frequency signal, institute
It states isolation magnetic bead one end and is connected with the input terminal of HDMI signals by the way that the device of high impedance is presented to high-frequency signal, other end difference
One or more signal wires are connected, for realizing the dc-couple of SCL signal；
The third magnetic bead group includes two isolation magnetic beads, and one end of two isolation magnetic beads is separately connected one or more
Signal wire, the other end are grounded after being connected；
The receiving terminal includes:Eight isolation capacitances, the 4th magnetic bead group, the 5th magnetic bead group, the 6th magnetic bead group and four grounded electricity
Resistance group；
One end of each isolation capacitance is connected with the TMDS signal input parts of the receiving terminal chip, and the other end connects one
One end of the signal wire is used for transmission first pair of differential signal, second pair of differential signal, the third to difference
Signal and the 4th pair of differential signal；
The four grounded resistance component is not connect with the TMDS signal input parts of the receiving terminal chip, a ground resistance group
The TMDS signal input parts of a pair of receiving terminal chip of connection, each ground resistance group include two ground resistances, and two
One end of a ground resistance is connected and is grounded, and the other end of two ground resistances is respectively connected to a pair of reception
Hold the TMDS signal input parts of chip；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead by being in high-frequency signal
The device of existing high impedance is connected with the output end of HDMI signals, and the other end is connected on one or more signal wires, uses
In the separation and output of realizing SCL signal；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead by being in high-frequency signal
The device of existing high impedance is connected with the output end of HDMI signals, and the other end is connected on one or more signal wires, uses
In the separation and output of realizing SDA signal；
The 5th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead by being in high-frequency signal
The device of existing high impedance is connected with the output end of HDMI signals, and the other end is connected on one or more signal wires, uses
In the separation and output of realizing SCL signal；
The 6th magnetic bead group includes one or two isolation magnetic beads, and one end that magnetic bead is isolated is connected to one or more
On root signal wire, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721746488.8U CN207910906U (en) | 2017-12-14 | 2017-12-14 | A kind of single cable extender of HDMI signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721746488.8U CN207910906U (en) | 2017-12-14 | 2017-12-14 | A kind of single cable extender of HDMI signals |
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| Publication Number | Publication Date |
|---|---|
| CN207910906U true CN207910906U (en) | 2018-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721746488.8U Active CN207910906U (en) | 2017-12-14 | 2017-12-14 | A kind of single cable extender of HDMI signals |
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| Country | Link |
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| CN (1) | CN207910906U (en) |
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