CN109525797A - A kind of single cable extender of data transmission method, HDMI signal - Google Patents
A kind of single cable extender of data transmission method, HDMI signal Download PDFInfo
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- CN109525797A CN109525797A CN201711342062.0A CN201711342062A CN109525797A CN 109525797 A CN109525797 A CN 109525797A CN 201711342062 A CN201711342062 A CN 201711342062A CN 109525797 A CN109525797 A CN 109525797A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 87
- 239000004606 Fillers/Extenders Substances 0.000 title claims abstract description 67
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- 239000011324 bead Substances 0.000 claims abstract description 96
- 230000005611 electricity Effects 0.000 claims abstract description 12
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- 238000002955 isolation Methods 0.000 claims description 43
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- 238000005859 coupling reaction Methods 0.000 claims description 22
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- 239000003990 capacitor Substances 0.000 claims description 13
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- 238000004891 communication Methods 0.000 abstract description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
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Abstract
The invention discloses a kind of data transmission methods, single cable extender of HDMI signal, data transmission method includes receiving HDMI signal, and four pairs of differential signals in HDMI signal are ac-coupled on four pairs of twisted pairs of single cable, again by the SDA signal in HDMI signal, SCL signal and HPD signal pass through the dc-couple of magnetic bead group on one or more signal wires, to realize single network cable transmission HDMI signal, the present invention completely supports a kind of implementation of the HDMI extender for single cable that HDCP is standardized, it can completely support the HDCP of HDMI interface to encrypt, EDID transmission, CEC communication, HPD passback, and it can support IR remote controller signal return other than HDMI interface function, it can also support to extend HDMI The wherein side of device supplies electricity to the other side, can be with save the cost to reduce the mounting complexity of system installation.
Description
Technical field
The present invention relates to transmission methods, single cable extender, more specifically, it be related to a kind of data transmission method,
Single cable extender of HDMI signal.
Background technique
Due to some characteristics of HDMI signal and HDMI wire material, it is however generally that, HDMI wire is when passing HDMI signal, the length of line
Degree is no more than 15 meters.But in practical applications, it often may require that HDMI signal 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 extender ", 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 transmission of wire transmission, requiring transmission range "=30 meters when, can all use net
Line 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 extender for using cable defeated, 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 technology of Velans company, the U.S., such as VS100 scheme.VS100 scheme is complete transmission 1080P's
100 meters can be passed when HD video, support whole support HDCP encryption, 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 scheme of (Taifa) company and the HDbitT scheme of Xin Lianyang company (ITE) are sent out by Taiwan Thailand；
Or the scheme of China's Mainland Rui Fake company (norelsys), such as NS5530/NS5531 scheme.This 3 kinds of schemes are all HDMI
The transmitting terminal of extender passes through network cable transmission after first HDMI signal compression is handled and encoded again, reaches the reception of HDMI extender
Reverse process again behind end, is reduced to HDMI signal.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 clarity is slightly worse since video is through overcompression, and there is 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 scheme of the Long Xun company (lontium) of MAX3814/MAX3815 scheme or China's Mainland.It is this kind of
Scheme is after transmitter amplifies the TMDS in HDMI signal, then arrives receiving end by network cable transmission, and receiving end passes through one
It is high performance to receive after the low-quality TMDS signal that chip transmits cable carries out integer amplification, it is reduced to normal TMDS
Signal.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, far below upper
The two major classes scheme stated；The disadvantage is that transmission range is shorter, in the full HD resolution ratio of 1080P only up to 50 meters.And in cable
The TMDS of transmission is encrypted without HDCP, this does not just meet the confidentiality requirement of HDCP specification.
Because this scheme by cable pass be directly just HDMI TMDS signal, and HDMITMDS need 4 pairs of difference
Line i.e. 8 piece line transmits, and has thus just all occupied cable.And HDMI must also have this several in normal work
A control signal could work: the channel DDC (channel DDC be by two signal line groups of SCL, SDA at), HPD, GND, 5V, so
In order to allow HDMI signal source, HDMI display end work normally, be 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 agreement the disadvantage is that wiring is complicated, while wanting two cables of cloth, and because a more cable integral into
This also rises.
TMDS signal is only passed between transmitter and receiver, does not transmit control signal.In order to make HDMI signal source normal
TMDS signal is sent out, transmitter can take the method taken advantage of time, directly reply HPD, DDC signal to HDMI signal source；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 and receiver to generate
One channel GND, so wanting
Because we have invented a kind of inexpensive (cost than several schemes of front will be low), and completely support
A kind of implementation of the HDMI extender of single cable of HDCP specification, it can completely support the HDCP of HDMI interface to add
Close, EDID transmission, CEC communication, HPD passback, and can support the IR remote controller signal return other than HDMI interface function, also
It can support that (HDMI extender is by transmitter and receiver the two independent group of individuals by the wherein side of HDMI extender
At) supply electricity to the other side (such as by transmitter by Power-over-Ethernet to receiver, or otherwise supply electricity to send by receiver
Device), it, can be with save the cost (saving a power supply adaptor) to reduce the mounting complexity of system installation.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of data transmission method, HDMI signal
Single cable extender.
To achieve the above object, the present invention provides the following technical scheme that a kind of data transmission method, is applied to HDMI and believes
Number single cable extender transmitting terminal, the data transmission method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
SDA signal in the HDMI signal is loaded into one or more described signal wires by dc-couple mode
On；
SCL signal in the HDMI signal is loaded into one or more described signal wires by dc-couple mode
On；
HPD signal in the HDMI signal is loaded into one or more described signal wires by dc-couple mode
On；
SDA signal, SCL signal, first pair of differential signal of HPD signal, second pair of differential signal, third pair will be coupled with
Differential signal or the 4th pair of differential signal are sent to the receiving end of the mono- cable extender of the HDMI by the cable.
Preferably, the receiving end applied to single cable extender of HDMI signal, the data transmission method include:
Receive the coupling SDA signal that the transmitting terminal of the mono- cable extender 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 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 end handle after export to
The output end of HDMI signal.
A kind of data transmission method, the transmitting terminal of single cable extender applied to HDMI signal, the transmission side data
Method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
CEC signal is loaded on one or more described signal wires by dc-couple mode；
The first pair of differential signal, second pair of differential signal, third of CEC signal will be coupled with to differential signal or the 4th
The receiving end of the mono- cable extender of the HDMI is sent to by the cable to differential signal.
Preferably, the receiving end applied to single cable extender of HDMI signal, the data transmission method include:
First pair of differential signal of the coupling CEC signal that the transmitting terminal of the reception mono- cable extender of HDMI is sent, second pair
Differential signal, third are to differential signal, the 4th pair of differential signal；
By CEC signal and first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair
Differential signal separation；
By the CEC signal isolated, first pair of differential signal, second pair of differential signal, the third
Differential signal, the 4th pair of differential signal are exported after the receiving end is handled to the output end of HDMI signal.
A kind of data transmission method, the transmitting terminal of single cable extender applied to HDMI signal, the transmission side data
Method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
Infrared remote-controlled signal is loaded on one or more described signal wires by dc-couple mode；
To be coupled with the first pair of differential signal, second pair of differential signal, third of infrared remote-controlled signal to differential signal or
The 4th pair of differential signal of person is sent to the receiving end of the mono- cable extender of the HDMI by the cable.
Preferably, the receiving end applied to single cable extender of HDMI signal, the data transmission method include:
It receives the coupling of the transmitting terminal transmission of the mono- cable extender 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 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.
A kind of data transmission method, the transmitting terminal of single cable extender applied to HDMI signal, the transmission side data
Method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
Power supply is loaded on one or more described signal wires by dc-couple mode；
The first pair of differential signal, second pair of differential signal, third of power supply will be coupled with to differential signal or the 4th pair
Differential signal is sent to the receiving end of the mono- cable extender of the HDMI by the cable.
Preferably, the receiving end applied to single cable extender of HDMI signal, the data transmission method include:
Receive the coupling or be superimposed first pair of differential signal of power supply, that the transmitting terminal of the mono- cable extender of HDMI is sent
Two pairs of differential signals, third are to differential signal, the 4th pair of differential signal；
By power supply and 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 processing isolated to power supply receiving end.
A kind of single cable extender of HDMI signal characterized by comprising transmitting terminal, single cable and receiving end, institute
The input terminal for stating transmitting terminal is connect with the TMDS signal input part 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 end, the output end of the receiving end and the TMDS signal input part of receiving end chip
Connection；
The single cable includes four pairs of twisted pairs, and four pairs of twisted pairs are respectively first pair of twisted pair, second pair pair
To twisted pair and the 4th pair of twisted pair, every a pair of twisted pair includes two signal wires for twisted wire, third:
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 part 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 part of the transmitting terminal chip, a resistance group connection
The TMD signal input part 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 the device that high impedance is presented to high-frequency signal by one or two isolation magnetic beads and one
Part, described isolation magnetic bead one end is connected by the device that high impedance is presented to high-frequency signal with the input terminal of HDMI signal, another
End is separately connected one or more signal wires, for realizing the dc-couple of SDA signal；
The second magnetic bead group includes the device that high impedance is presented to high-frequency signal by one or two isolation magnetic beads and one
Part, described isolation magnetic bead one end is connected by the device that high impedance is presented to high-frequency signal with the input terminal of HDMI signal, 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 be isolated magnetic beads one end be separately connected one or
More signal wires, the other end are grounded after being connected；
The receiving end includes: that 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 part of the receiving end 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 part of the receiving end chip, a ground connection electricity
The TMDS signal input part of a pair of receiving end 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 part of receiving end chip；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead passes through by height
The device that high impedance is presented in frequency signal is connected with the output end of HDMI signal, and the other end is connected to one or more signals
On line, 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 passes through by height
The device that high impedance is presented in frequency signal is connected with the output end of HDMI signal, and the other end is connected to one or more signals
On line, 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 passes through by height
The device that high impedance is presented in frequency signal is connected with the output end of HDMI signal, and the other end is connected to one or more signals
On line, 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 present invention has an advantage that a kind of reality of the HDMI extender of the complete single cable for supporting HDCP specification of the invention
Existing scheme, it can completely support the HDCP of HDMI interface to encrypt, EDID transmission, CEC is communicated, HPD is returned, and can be supported
IR remote controller signal return other than HDMI interface function can also support that (HDMI prolongs by the wherein side of HDMI extender
Long device is made of transmitter and receiver the two independent individuals) it supplies electricity to the other side and (cable is such as passed through by transmitter
Supply electricity to receiver, or otherwise transmitter supplied electricity to by receiver), it, can be with to reduce the mounting complexity of system installation
Save the cost saves a power supply adaptor.
Detailed description of the invention
Fig. 1 is that a kind of data of single cable extender transmitting terminal applied to HDMI signal provided in an embodiment of the present invention pass
Defeated flow chart.
Fig. 2 is that a kind of data of single cable extender receiving end applied to HDMI signal provided in an embodiment of the present invention pass
Defeated flow chart.
Fig. 3 is that the circuit of the single infrared IR+Power transmission of cable transmission HDMI (containing SDA, SCL, HPD)+CEC+ of the present invention is real
Existing block diagram.
Fig. 4 is single cable extender structural schematic diagram of the first HDMI signal of the invention.
Fig. 5 is single cable extender structural schematic diagram of second of HDMI signal of the invention.
Fig. 6 is single cable extender structural schematic diagram of the third HDMI signal of the invention.
Fig. 7 is single cable extender structural schematic diagram of the 4th kind of HDMI signal of the invention.
Fig. 8 is single cable extender structural schematic diagram of the 5th kind of HDMI signal of the invention.
Fig. 9 is single cable extender structural schematic diagram of the 6th kind of HDMI signal of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with spy
Fixed orientation construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting 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 of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
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 second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal 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, the transmitting terminal of single cable extender applied to HDMI signal are described
Data transmission method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
SDA signal in the HDMI signal is loaded into one or more described signal wires by dc-couple mode
On；
SCL signal in the HDMI signal is loaded into one or more described signal wires by dc-couple mode
On；
HPD signal in the HDMI signal is loaded into one or more described signal wires by dc-couple mode
On.
The receiving end of single cable extender applied to HDMI signal, the data transmission method include:
Receive the coupling SDA signal that the transmitting terminal of the mono- cable extender 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 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 end handle after export to
The output end of HDMI signal.
SCL, SDA the two signals are added to by the device that high impedance is presented to high-frequency signal respectively transmission
In 1 of TMDS signal 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)；It will be sent to what cable got on
SCL, SDA signal are needed first to carry out signal enhancing, could be sent on cable by magnetic bead, cannot directly be met HDMI
SCL, SDA that mouth is sent are added on cable by magnetic bead, this is because: cable can be long, each line between that cable
Between distribution capacity can be bigger, reach nF rank；And every cable transmitter and receiver-side have one every
Straight capacitor can allow the signal of SCL, SDA can not so these capacitors can seriously cut the voltage change speed of about SCL or SDA signal
It is correctly validated, thus communication failure；For SDA signal, it is two-way, and none 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 none 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 the 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
, it is also possible to 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 by enhanced SDA can be only electric current in terms of enhancing without making to voltage amplitude
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 on cable by magnetic bead；HPD is to be sent to sender side from receiver-side, it can be with
It is directly to be superimposed with TMDS, is also possible to be superimposed with TMDS again 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 be added to simultaneously 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)；HPD can wherein appoint with SCL, SDA, CEC, infrared remote control
After signal of anticipating is superimposed once again, such as HPD is superimposed with SDA, then it 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 only HPD is that height usually just indicates that HDMI shows that equipment has access, at this moment just in HDMI
It needs to be communicated by SCL, SDA with display equipment；The above voltage value is an example, can actually be using difference
Voltage value indicate the state of some signal.
If in certain a pair of of twisted pair the signal that its both threads are superimposed were different, receiver end every
After straight capacitor, it is possible to need with one to TMDS signal in high impedance but to this to the low frequency signal of twisted pair superposition 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, the transmitting terminal of single cable extender applied to HDMI signal, the transmission side data
Method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
CEC signal is loaded on one or more described signal wires by dc-couple mode.
The receiving end of single cable extender applied to HDMI signal, the data transmission method include:
First pair of differential signal of the coupling CEC signal that the transmitting terminal of the reception mono- cable extender of HDMI is sent, second pair
Differential signal, third are to differential signal, the 4th pair of differential signal；
By CEC signal and first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair
Differential signal separation；
By the CEC signal isolated, first pair of differential signal, second pair of differential signal, the third
Differential signal, the 4th pair of differential signal are exported after the receiving end is handled to the output end of HDMI signal.
CEC signal is added to by the device that high impedance is presented to high-frequency signal 1 of transmission TMDS signal
Or in many netting twines；The distribution capacity between each line for CEC signal, if cable is long, between that cable
Can be bigger, reach nF rank；And every cable has a capacitance in transmitter and receiver-side, so these
Capacitor can seriously cut the voltage change speed of about CEC signal, can allow CEC signal that can not be correctly validated, thus communication failure, institute
To need first to carry out signal enhancing to transmit again；For CEC signal, it is two-way, and none 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, be also possible to reverse phase, and voltage amplitude can also be complete
It is different；Such as the high level amplitude in the CEC of the HDMI interface 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 pass through its in this 8 simultaneously
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) or 3.
If in certain a pair of of twisted pair the signal that its both threads are superimposed were different, receiver end every
After straight capacitor, it is possible to need with one to TMDS signal in high impedance but to this to the low frequency signal of twisted pair superposition 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, the transmitting terminal of single cable extender applied to HDMI signal, the transmission side data
Method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
Infrared remote-controlled signal is loaded on one or more described signal wires by dc-couple mode.
The receiving end of single cable extender applied to HDMI signal, the data transmission method include:
It receives the coupling of the transmitting terminal transmission of the mono- cable extender 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 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 signal) can also be superimposed on cable by magnetic bead；IR signal is from infrared receiver
Infrared transmitter side is sent to by cable in device side, it, which can be, is directly superimposed with TMDS, is also possible to by voltage transformation
Be superimposed again with TMDS afterwards, the mode of voltage transformation includes but is not limited to: (such as high level is 3V, and low level is for reverse phase, level translation
1V), carrier modulation (such as AM, FM, ASK, FSK)；
IR signal, which can be, to be only added on a cable, can also be added to simultaneously 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)；
IR signal can be superimposed once again with CEC signal, such as after IR signal and CEC Signal averaging, 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 signal, will be a minimum of
3 kinds of different level values, such as: > 4.5V indicates to receive IR signal；About 2.5V, expression are not received by IR signal, CEC letter
Number remain high level；< 0.5V, expression CEC signal are low level.
The above voltage value is an example, and the shape of some signal can actually be indicated using different voltage values
State.
If in certain a pair of of twisted pair the signal that its both threads are superimposed were different, receiver end every
After straight capacitor, it is possible to need with one to TMDS signal in high impedance but to this to the low frequency signal of twisted pair superposition 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, the transmitting terminal of single cable extender applied to HDMI signal, the transmission side data
Method includes:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, described
TMDS signal includes 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 every a pair of Difference signal pair answers two signal wires；
Power supply is loaded on one or more described signal wires by dc-couple mode.
The receiving end of single cable extender applied to HDMI signal, the data transmission method include:
Receive the coupling or be superimposed first pair of differential signal of power supply, that the transmitting terminal of the mono- cable extender of HDMI is sent
Two pairs of differential signals, third are to differential signal, the 4th pair of differential signal；
By power supply and 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 processing isolated to power supply receiving end.
Power supply transmitting function: power supply can be by cable, by the other end of the power supply transmission cable of external power supply.
It can use wherein one or more progress power delivery in cable；It is also different if transmitted using 2
Provisioning request this two is in a pair of of twisted pair.
It is opposite with external voltage by the voltage of network cable transmission, can be identical, higher, or it is lower be ok, do not limit
It is fixed；
It can be external power supply and be connected to transmitter, receiver then to is sent power supply by cable；It is also possible to 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 < 10mA in advance
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 is 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 the signal that its both threads are superimposed were different, receiver end every
After straight capacitor, it is possible to need with one to TMDS signal in high impedance but to this to the low frequency signal of twisted pair superposition 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
Present embodiments provide a kind of single cable extender of HDMI signal, comprising: transmitting terminal, single cable and reception
End, the input terminal of the transmitting terminal are connect with the TMDS signal input part 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 end, the output end of the receiving end and the TMDS signal of receiving end chip
Input terminal connection；
The single cable includes four pairs of twisted pairs, and four pairs of twisted pairs are respectively first pair of twisted pair, second pair pair
To twisted pair and the 4th pair of twisted pair, every a pair of twisted pair includes two signal wires for twisted wire, third:
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 part 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 part of the transmitting terminal chip, a resistance group connection
The TMD signal input part 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 the device that high impedance is presented to high-frequency signal by one or two isolation magnetic beads and one
Part, described isolation magnetic bead one end is connected by the device that high impedance is presented to high-frequency signal with the input terminal of HDMI signal, another
End is separately connected one or more signal wires, for realizing the dc-couple of SDA signal；
The second magnetic bead group includes the device that high impedance is presented to high-frequency signal by one or two isolation magnetic beads and one
Part, described isolation magnetic bead one end is connected by the device that high impedance is presented to high-frequency signal with the input terminal of HDMI signal, 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 be isolated magnetic beads one end be separately connected one or
More signal wires, the other end are grounded after being connected；
The receiving end includes: that 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 part of the receiving end 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 part of the receiving end chip, a ground connection electricity
The TMDS signal input part of a pair of receiving end 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 part of receiving end chip；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead passes through by height
The device that high impedance is presented in frequency signal is connected with the output end of HDMI signal, and the other end is connected to one or more signals
On line, 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 passes through by height
The device that high impedance is presented in frequency signal is connected with the output end of HDMI signal, and the other end is connected to one or more signals
On line, 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 passes through by height
The device that high impedance is presented in frequency signal is connected with the output end of HDMI signal, and the other end is connected to one or more signals
On line, 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 a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of data transmission method, the transmitting terminal of single cable extender applied to HDMI signal, the data transmission method
Include:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, the TMDS
Signal includes 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 exchange coupling to differential signal, the 4th pair of differential signal
Conjunction mode is loaded into respectively on eight signal wires of a cable, and every a pair of Difference signal pair answers two signal wires；
SDA signal in the HDMI signal is loaded on one or more described signal wires by dc-couple mode；
SCL signal in the HDMI signal is loaded on one or more described signal wires by dc-couple mode；
HPD signal in the HDMI signal is loaded on one or more described signal wires by dc-couple mode；
SDA signal, SCL signal, first pair of differential signal of HPD signal, second pair of differential signal, third will be coupled with to difference
Signal or the 4th pair of differential signal are sent to the receiving end of the mono- cable extender of the HDMI by the cable.
2. a kind of data transmission method according to claim 1, which is characterized in that single cable applied to HDMI signal prolongs
The receiving end of long device, the data transmission method include:
Receive first pair for coupling SDA signal, SCL signal or HPD signal that the transmitting terminal of the mono- cable extender of HDMI is sent
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 first pair of differential signal, second pair of differential signal, third pair
Differential signal, the 4th pair of differential signal separation；
By the SDA signal isolated, the SCL signal, the HPD signal, first pair of differential signal, described second
Differential signal, the third export after the receiving end is handled to HDMI differential signal, the 4th pair of differential signal
The output end of signal.
3. a kind of data transmission method, the transmitting terminal of single cable extender applied to HDMI signal, the data transmission method
Include:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, the TMDS
Signal includes 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 exchange coupling to differential signal, the 4th pair of differential signal
Conjunction mode is loaded into respectively on eight signal wires of a cable, and every a pair of Difference signal pair answers two signal wires；
CEC signal is loaded on one or more described signal wires by dc-couple mode；
The first pair of differential signal, second pair of differential signal, third of CEC signal will be coupled with to differential signal or the 4th pair of difference
Sub-signal is sent to the receiving end of the mono- cable extender of the HDMI by the cable.
4. a kind of data transmission method according to claim 3, which is characterized in that single cable applied to HDMI signal prolongs
The receiving end of long device, the data transmission method include:
Receive first pair of differential signal for coupling CEC signal, the second pair of difference that the transmitting terminal of the mono- cable extender of HDMI is sent
Signal, third are to differential signal, the 4th pair of differential signal；
By CEC signal and first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair of difference
Signal separator；
By the CEC signal isolated, first pair of differential signal, second pair of differential signal, the third to difference
Sub-signal, the 4th pair of differential signal are exported after the receiving end is handled to the output end of HDMI signal.
5. a kind of data transmission method, the transmitting terminal of single cable extender applied to HDMI signal, the data transmission method
Include:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, the TMDS
Signal includes 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 exchange coupling to differential signal, the 4th pair of differential signal
Conjunction mode is loaded into respectively on eight signal wires of a cable, and every a pair of Difference signal pair answers two signal wires；
Infrared remote-controlled signal is loaded on one or more described signal wires by dc-couple mode；
The first pair of differential signal, second pair of differential signal, third of infrared remote-controlled signal will be coupled with to differential signal or
Four pairs of differential signals are sent to the receiving end of the mono- cable extender of the HDMI by the cable.
6. a kind of data transmission method according to claim 5, which is characterized in that single cable applied to HDMI signal prolongs
The receiving end of long device, the data transmission method include:
It receives the coupling of the transmitting terminal transmission of the mono- cable extender of HDMI or is superimposed first pair of difference letter of infrared remote-controlled signal
Number, second pair of differential signal, third be to differential signal, the 4th pair of differential signal；
By infrared remote-controlled signal and first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair
Differential signal separation；
By output after the infrared remote-controlled signal isolated processing to infrared signal sending device.
7. a kind of data transmission method, the transmitting terminal of single cable extender applied to HDMI signal, the data transmission method
Include:
The HDMI signal that HDMI signal input part is sent is received, the HDMI signal includes the TMDS signal of encryption, the TMDS
Signal includes 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 exchange coupling to differential signal, the 4th pair of differential signal
Conjunction mode is loaded into respectively on eight signal wires of a cable, and every a pair of Difference signal pair answers two signal wires；
Power supply is loaded on one or more described signal wires by dc-couple mode；
The first pair of differential signal, second pair of differential signal, third of power supply will be coupled with to differential signal or the 4th pair of difference
Signal is sent to the receiving end of the mono- cable extender of the HDMI by the cable.
8. a kind of data transmission method according to claim 7, which is characterized in that single cable applied to HDMI signal prolongs
The receiving end of long device, the data transmission method include:
It receives the coupling of the transmitting terminal transmission of the mono- cable extender of HDMI or is superimposed first pair of differential signal of power supply, second pair
Differential signal, third are to differential signal, the 4th pair of differential signal；
By power supply and first pair of differential signal, second pair of differential signal, third to differential signal, the 4th pair of differential signal
Separation；
By output after the power supply processing isolated to power supply receiving end.
9. a kind of single cable extender of HDMI signal characterized by comprising transmitting terminal, single cable and receiving end, it is described
The input terminal of transmitting terminal is connect with the TMDS signal input part 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 end, and the output end of the receiving end and the TMDS signal input part of receiving end chip connect
It connects；
The single cable include four pairs of twisted pairs, four pairs of twisted pairs be respectively first pair of twisted pair, second pair of twisted pair,
For third to twisted pair and the 4th pair of twisted pair, every a pair of twisted pair includes two signal wires:
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 part 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 part of the transmitting terminal chip, and a resistance group connection is a pair of
The TMD signal input part 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 signal of a pair of transmitting terminal chip
Input terminal；
The first magnetic bead group includes the device that high impedance is presented to high-frequency signal by one or two isolation magnetic beads and one, institute
It states isolation magnetic bead one end to be connected by the device that high impedance is presented to high-frequency signal with the input terminal of HDMI 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 the device that high impedance is presented to high-frequency signal by one or two isolation magnetic beads and one, institute
It states isolation magnetic bead one end to be connected by the device that high impedance is presented to high-frequency signal with the input terminal of HDMI 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 end 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 part of the receiving end 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 part of the receiving end chip, a ground resistance group
The TMDS signal input part of a pair of receiving end 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 part of chip；
The 4th magnetic bead group includes one or two isolation magnetic beads, and one end of the isolation magnetic bead passes through by believing high frequency
Number present high impedance device be connected with the output end of HDMI signal, 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 passes through by believing high frequency
Number present high impedance device be connected with the output end of HDMI signal, 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 passes through by believing high frequency
Number present high impedance device be connected with the output end of HDMI signal, 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 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.
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Application publication date: 20190326 |
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