CN104618677A - TMDS (transition minimized differential signaling) bidirectional transmission system of signal - Google Patents
TMDS (transition minimized differential signaling) bidirectional transmission system of signal Download PDFInfo
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- CN104618677A CN104618677A CN201510066507.1A CN201510066507A CN104618677A CN 104618677 A CN104618677 A CN 104618677A CN 201510066507 A CN201510066507 A CN 201510066507A CN 104618677 A CN104618677 A CN 104618677A
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Abstract
The invention discloses a TMDS (transition minimized differential signaling) bidirectional transmission system of a signal. The TMDS bidirectional transmission system of the signal comprises a master control MCU (micro controller unit), an HDMI (high definition multimedia interface) signal interface A, an HDMI signal interface B, a TMDS switch drive circuit A where the TMDS signal can be input through the HDMI signal interface A and output through the HDMI signal interface B, a TMDS switch drive circuit B where the TMDS signal can be input through the HDMI signal interface B and output through the HDMI signal interface A and a TMDS bidirectional transmission circuit. The TMDS bidirectional transmission system of the signal can achieve transmission of the signal from the HDMI signal interface A to the HDMI signal interface B and further can achieve transmission of the signal from the HDMI signal interface B to the HDMI signal interface A through drive switches provided by the TMDS switch drive circuit A and the TMDS switch drive circuit B, achieves bidirectional transmission on a unified channel, saves a large space, and can further reduce unnecessary resource waste.
Description
Technical field
The present invention relates to the field of high-definition data transmission communication electronics, mainly for based on the TMDS signal bi-directional conversion of HDMI/DVI and transmission.
Background technology
In all multimedia audio-video high definitions and ultra high-definition circuit, transition minimized differential signaling (TMDS:Transition Minimized Differential signal), hereinafter referred to as TMDS signal, also by title transition modulation differential signal, refer to and convert original signal data to 10 by the logical algorithm such as XOR and XNOR, front 8 bit data are obtained after computing by primary signal, the mode of the 9th instruction computing, 10th is used for corresponding DC balance (DC-balanced, just refer to and ensure that in channel, direct current offset is zero in an encoding process, level translation realizes the coupling between Different Logic interface), data after conversion are with the transmission of the difference kind of drive.This algorithm makes the upper punch and the undershoot reduction that are transmitted signal transition process, and the data of transmission are tending towards DC balance, and signal is reduced the electromagnetic interference of transmission line, improve speed and the reliability of Signal transmissions.Digital Visual Interface (Digital Visual Interface), hereinafter referred to as DVI.High-definition media interface (High Definition Multimedia Interface) is hereinafter referred to as HDMI.TMDS signal is a kind of consensus standard of the interface data signal transmission such as HDMI and DVI.
It can only be with one-way transmission that usual HDMI or DVI signal transmits in circuit.Therefore be all with two independent channel transfer TMDS signals in circuit application.There is the TMDS input channel that special, also have the TMDS output channel that special, that is need the autonomous channel of at least two HDMI.The application of autonomous channel in a lot of product of two HDMI can take more space, also can increase by cost.In application with two independent channel transfer TMDS signals, always have that passage is on the shelf causes the wasting of resources at ordinary times.
Summary of the invention
The present invention, in order to solve problems of the prior art, provides a kind of TMDS bidirectional transmission system of signal.
In order to realize above-mentioned object, technical scheme of the present invention is: a kind of TMDS bidirectional transmission system of signal, comprise main control MCU, and HDMI signaling interface A, HDMI signaling interface B, and TMDS signal inputs from HDMI signaling interface A, from the TMDS switch driving circuit A that HDMI signaling interface B exports, and TMDS signal inputs from HDMI signaling interface B, from the TMDS switch driving circuit B that HDMI signaling interface A exports.
Preferably, the pin of HDMI signaling interface A connects diode D7 negative electrode, and diode D7 anode and resistance R51 connect to form AND circuit; R51 is connected in TMDS switch driving circuit A provides " 0 " or level"1" to control the K2 delivery outlet with door switch; Diode D7 anode connects the pin delivery outlet of electric capacity C19 to HDMI signaling interface B;
The pin of HDMI signaling interface B connects diode D8 negative electrode, and D8 anode and resistance R43 connect to form AND circuit; R43 is connected in TMDS switch driving circuit B provides " 0 " or level"1" to control the K1 delivery outlet with door switch, and diode D8 anode connects the pin delivery outlet of electric capacity C11 to HDMI signaling interface A.
Preferably, the automatic identification module of port for detecting HDMI signaling interface A, HDMI signaling interface B signal mode is also comprised.
Bidirectional transmission system provided by the invention, by the driving switch that TMDS switch driving circuit A, B provide, the transmission of TMDS signal from HDMI signaling interface A to HDMI signaling interface B can be realized, also can realize the transmission of TMDS signal from HDMI signaling interface B to HDMI signaling interface A.Achieve again the transmitted in both directions on same HDMI passage, and more spaces can be saved, also can reduce the unnecessary wasting of resources.
Accompanying drawing explanation
Fig. 1 shows the block diagram of bidirectional transmission system of the present invention.
Fig. 2 shows the circuit theory diagrams of bidirectional transmission system of the present invention.
Embodiment
The technical problem solved to make the present invention, the technical scheme of employing, the technique effect easy to understand obtained, below in conjunction with concrete accompanying drawing, be described further the specific embodiment of the present invention.
With reference to figure 1, Fig. 2, the invention provides a kind of TMDS bidirectional transmission system of signal, comprise main control MCU, and HDMI signaling interface A, HDMI signaling interface B, and TMDS signal inputs from HDMI signaling interface A, from the TMDS switch driving circuit A that HDMI signaling interface B exports, and TMDS signal inputs from HDMI signaling interface B, from the TMDS switch driving circuit B that HDMI signaling interface A exports.
Main control MCU can detect HDMI signaling interface A or detect pin 18 signal voltage of HDMI signaling interface B input, judgement is input signal pattern or output mode signal, then export control signal to TMDS signal switching drive circuit from S1 or S2, the change-over circuit being outputed signal control TMDS transmitted in both directions by TMDS switch driving circuit is transformed into sense the pattern wanted.
Particularly, input from HDMI signaling interface A with reference to figure 2, TMDS, be transferred to HDMI signaling interface B and export, configure as follows:
A. in described circuit, the pin 1 of HDMI signaling interface A connects D7 negative electrode, and D7 anode and resistance R51 connect to form AND circuit.R51 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data2+ " signal of TMDS, " Data2+ " signal is transferred to pin 1 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C19 be connected with D7 anode.
B. in described circuit, the pin 3 of HDMI signaling interface A connects D9 negative electrode, and D9 anode and resistance R52 connect to form AND circuit.R52 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data2-" signal of TMDS, " Data2-" signal is transferred to pin 3 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C20 be connected with D9 anode.Signal passes through the TMDS signal differential of the above HDMI signaling interface A transmission to (Data2+; Data2-/hereinafter referred to as A mono-group) be transferred to the negative electrode of A mono-group of TMDS to D7, D9.
C. in described circuit, the pin 4 of HDMI signaling interface A connects D11 negative electrode, and D11 anode and resistance R53 connect to form AND circuit.R53 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data1+ " signal of TMDS, " Data1+ " signal is transferred to pin 4 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C21 be connected with D11 anode.
D. in described circuit, the pin 6 of HDMI signaling interface A connects D13 negative electrode, and D13 anode and resistance R54 connect to form AND circuit.R54 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data1-" signal of TMDS, " Data1-" signal is transferred to pin 6 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C22 be connected with D13 anode.Signal passes through the TMDS signal differential of the above HDMI signaling interface A transmission to (Data1+; Data1-/hereinafter referred to as A bis-groups) be transferred to the negative electrode of A bis-groups of TMDS to D11, D13.
E. in described circuit, the pin 7 of HDMI signaling interface A connects D15 negative electrode, and D15 anode and resistance R55 connect to form AND circuit.R55 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data0+ " signal of TMDS, " Data0+ " signal is transferred to pin 7 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C23 be connected with D15 anode.
F. in described circuit, the pin 9 of HDMI signaling interface A connects D17 negative electrode, and D17 anode and resistance R56 connect to form AND circuit.R56 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data0-" signal of TMDS, " Data0-" signal is transferred to pin 9 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C24 be connected with D17 anode.Signal passes through the TMDS signal differential of the above HDMI signaling interface A transmission to (Data0+; Data0-/hereinafter referred to as A tri-groups) be transferred to the negative electrode of A tri-groups of TMDS to D15, D17.
G. in described circuit, the pin 10 of HDMI signaling interface A connects D19 negative electrode, and D19 anode and resistance R57 connect to form AND circuit.R57 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data Cock+ " signal of TMDS, " Data Cock+ " signal is transferred to pin 10 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C25 be connected with D19 anode.
H. in described circuit, the pin 12 of HDMI signaling interface A connects D21 negative electrode, and D21 anode and resistance R58 connect to form AND circuit.R58 is connected to the K2 delivery outlet of TMDS switch driving circuit A, K2 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data Cock-" signal of TMDS, " Data Cock-" signal is transferred to pin 12 delivery outlet of HDMI signaling interface B, with reference to figure 2 by the electric capacity C26 be connected with D21 anode.Signal passes through the TMDS signal differential of the above HDMI signaling interface A transmission to (Data Cock+; Data Cock-/hereinafter referred to as A tetra-groups) be transferred to the negative electrode of A tetra-groups of TMDS to D19, D21.
TMDS inputs from HDMI signaling interface B, is transferred to HDMI signaling interface A and exports, configure as follows:
A. in described circuit, the pin 1 of HDMI signaling interface B connects D8 negative electrode, and D8 anode and resistance R43 connect to form AND circuit.R43 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data2+ " signal of TMDS, " Data2+ " signal is transferred to pin 1 delivery outlet of HDMI signaling interface A by the electric capacity C11 be connected with D8 anode.
B. in described circuit, the pin 3 of HDMI signaling interface B connects D10 negative electrode, and D10 anode and resistance R44 connect to form AND circuit.R44 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data2-" signal of TMDS, " Data2-" signal is transferred to pin 3 delivery outlet of HDMI signaling interface A by the electric capacity C12 be connected with D10 anode.
Signal passes through the TMDS signal differential of the above HDMI signaling interface B transmission to (Data2+; Data2-/hereinafter referred to as B mono-group) be transferred to the negative electrode of B mono-group of TMDS to D8, D10.
C. in described circuit, the pin 4 of HDMI signaling interface B connects D12 negative electrode, and D12 anode and resistance R45 connect to form AND circuit.R45 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data1+ " signal of TMDS, " Data1+ " signal is transferred to pin 4 delivery outlet of HDMI signaling interface A by the electric capacity C13 be connected with D12 anode.
D. in described circuit, the pin 6 of HDMI signaling interface B connects D14 negative electrode, and D14 anode and resistance R46 connect to form AND circuit.R46 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data1-" signal of TMDS, " Data1-" signal is transferred to pin 6 delivery outlet of HDMI signaling interface A by the electric capacity C14 be connected with D14 anode.
Signal passes through the TMDS signal differential of the above HDMI signaling interface B transmission to (Data1+; Data1-/hereinafter referred to as B bis-groups) be transferred to the negative electrode of B bis-groups of TMDS to D12, D14.
E. in described circuit, the pin 7 of HDMI signaling interface B connects D16 negative electrode, and D16 anode and resistance R47 connect to form AND circuit.R47 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data0+ " signal of TMDS, " Data0+ " signal is transferred to pin 7 delivery outlet of HDMI signaling interface A by the electric capacity C15 be connected with D16 anode.
F. in described circuit, the pin 9 of HDMI signaling interface B connects D18 negative electrode, and D18 anode and resistance R48 connect to form AND circuit.R48 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data0-" signal of TMDS, " Data0-" signal is transferred to pin 9 delivery outlet of HDMI signaling interface A by the electric capacity C16 be connected with D18 anode.
Signal passes through the TMDS signal differential of the above HDMI signaling interface B transmission to (Data0+; Data0-/hereinafter referred to as B tri-groups) be transferred to the negative electrode of B tri-groups of TMDS to D16, D18.
G. in described circuit, the pin 10 of HDMI signaling interface B connects D20 negative electrode, and D20 anode and resistance R49 connect to form AND circuit.R49 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data Cock+ " signal of TMDS, " Data Cock+ " signal is transferred to pin 10 delivery outlet of HDMI signaling interface A by the electric capacity C17 be connected with D20 anode.
H. in described circuit, the pin 12 of HDMI signaling interface B connects D22 negative electrode, and D22 anode and resistance R50 connect to form AND circuit.R50 is connected to the K1 delivery outlet of TMDS switch driving circuit B, K1 delivery outlet can provide " 0 " or level"1" to control the switch with door, thus open or close " Data Cock-" signal of TMDS, " Data Cock-" signal is transferred to pin 12 delivery outlet of HDMI signaling interface A by the electric capacity C18 be connected with D22 anode.
Signal passes through the TMDS signal differential of the above HDMI signaling interface B transmission to (DataCock+; Data Cock-/hereinafter referred to as B tetra-groups) be transferred to the negative electrode of B tetra-groups of TMDS to D20, D22.
Bidirectional transmission system provided by the invention, by the driving switch that TMDS switch driving circuit A, B provide, the transmission of signal from HDMI signaling interface A to HDMI signaling interface B can be realized, also can realize the transmission from HDMI signaling interface B to HDMI signaling interface A.Achieve again the transmitted in both directions on same HDMI passage, and more spaces can be saved, also can reduce the unnecessary wasting of resources.
Bidirectional transmission system of the present invention, can be applicable to all products with transmission TMDS signal, may be used for allly there is the electronic product of the high-definition interfaces such as HDMI or DVI and the circuit of relevant TMDS Signal transmissions, such as high definition DVD (comprising HDMI high definition 3D blue-ray DVD, HDMI ultra high-definition 4K DVD etc.); High resolution audio and video digital product as, digital camera, panel computer, desktop computer, DV etc.; Home appliance as, high definition display device (comprising ultra high-definition) television set, projector, computer monitor etc.; Outdoor display device is as, outdoor high-definition advertisement screen etc.; Engineering project as, subway display system, the display of building high definition and supervisory control system, conference system, family's display system etc.
The present invention is by preferred embodiment having carried out detailed explanation.But, by studying carefully above, concerning the change of each execution mode with to increase be apparent for one of ordinary skill in the art.Being intended that these changes all and increasing of applicant has all dropped in scope that the claims in the present invention protect.
Claims (3)
1. the TMDS bidirectional transmission system of a signal, it is characterized in that: comprise main control MCU, and HDMI signaling interface A, HDMI signaling interface B, and TMDS signal inputs from HDMI signaling interface A, from the TMDS switch driving circuit A that HDMI signaling interface B exports, and TMDS signal inputs from HDMI signaling interface B, from the TMDS switch driving circuit B that HDMI signaling interface A exports.
2. bidirectional transmission system according to claim 1, is characterized in that:
The pin of HDMI signaling interface A connects diode D7 negative electrode, and diode D7 anode and resistance R51 connect to form AND circuit; R51 is connected in TMDS switch driving circuit A provides " 0 " or level"1" to control the K2 delivery outlet with door switch; Diode D7 anode connects the pin delivery outlet of electric capacity C19 to HDMI signaling interface B;
The pin of HDMI signaling interface B connects diode D8 negative electrode, and D8 anode and resistance R43 connect to form AND circuit; R43 is connected in TMDS switch driving circuit B provides " 0 " or level"1" to control the K1 delivery outlet with door switch, and diode D8 anode connects the pin delivery outlet of electric capacity C11 to HDMI signaling interface A.
3. bidirectional transmission system according to claim 1, is characterized in that: also comprise the automatic identification module of port for detecting HDMI signaling interface A, HDMI signaling interface B signal mode.
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Cited By (2)
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| CN106454183A (en) * | 2016-08-31 | 2017-02-22 | 北京竞业达数码科技有限公司 | Configurable multi-way video switching device with various control interfaces |
| TWI692235B (en) * | 2019-03-08 | 2020-04-21 | 大陸商北京集創北方科技股份有限公司 | Half-duplex data transmission method and communication system using the same |
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| TWI692235B (en) * | 2019-03-08 | 2020-04-21 | 大陸商北京集創北方科技股份有限公司 | Half-duplex data transmission method and communication system using the same |
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Application publication date: 20150513 |