CN109302635B - Shared transmission circuit of HDMI signal line and control line and television - Google Patents
Shared transmission circuit of HDMI signal line and control line and television Download PDFInfo
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- CN109302635B CN109302635B CN201811207762.3A CN201811207762A CN109302635B CN 109302635 B CN109302635 B CN 109302635B CN 201811207762 A CN201811207762 A CN 201811207762A CN 109302635 B CN109302635 B CN 109302635B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 31
- 238000007493 shaping process Methods 0.000 claims abstract description 46
- 238000002955 isolation Methods 0.000 claims abstract description 38
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a shared transmission circuit of an HDMI signal line and a control line and a television, wherein a common mode amplitude modulation circuit is arranged on a television box, an isolation shaping circuit is arranged on a display terminal, the common mode amplitude modulation circuit receives a first control signal, the amplitude of the first control signal is adjusted, and a second control signal obtained after the adjustment is output to the HDMI signal line; the isolation shaping circuit obtains the second control signal from the HDMI signal line, and performs filtering and shaping processing on the second control signal to obtain the first control signal, so that the purpose of transmitting the low-frequency control signal by using a standard HDMI signal line is achieved, the purpose of shared transmission of the HDMI signal line and a control line is achieved, and the cost performance of a product is greatly improved.
Description
Technical Field
The invention relates to the field of information transmission, in particular to a shared transmission circuit of an HDMI signal line and a control line and a television.
Background
The existing split televisions (except for wireless connection) all need a large number of signal lines to connect the external box with the display end so as to transmit HDMI signals, key control signals, infrared remote control signals, indicator light signals, voice control signals, I2C signals, USB2.0 signals and the like, but the cost of using the external line of a general special machine is high, which is not economical, if a certain split television uses the external line of the special machine, the connection cost is as follows: line 75 yuan (1.3m) + four fixed posts 6 yuan + two sockets 18 yuan is 99 yuan.
The HDMI is a mainstream interface on the current video multimedia product, almost all televisions, set-top boxes and household game machines can be provided with the HDMI, the cost of a common HDMI wire with the length of 1.3m plus two sockets is less than 20 yuan, some circuits are used for sharing direct current and alternating current signals and alternating current signals, a standard HDMI connecting wire can be used for transmitting various control signals, and the HDMI video multimedia interface is simple, fast, efficient and economical, and greatly improves the cost performance of products.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a shared transmission circuit of an HDMI signal line and a control line and a television, and aims to solve the technical problems that in the prior art, a split television needs a special signal line and a control line to realize signal transmission, and the cost is high.
In order to achieve the above object, the present invention provides a shared transmission circuit of an HDMI signal line and a control line, the circuit comprising: the common mode amplitude modulation circuit is arranged on the television box, and the isolation shaping circuit is arranged on the display terminal; the common-mode amplitude modulation circuit is used for receiving a first control signal, carrying out amplitude adjustment on the first control signal and outputting a second control signal obtained after adjustment to an HDMI signal line; the isolation shaping circuit is used for acquiring the second control signal from the HDMI signal line, and performing filtering and shaping processing on the second control signal to obtain the first control signal.
Preferably, the common mode amplitude modulation circuit includes an amplitude modulation unit, and the amplitude modulation unit is connected to the first HDMI interface of the television box and the first microcontroller of the television box, respectively.
Preferably, the amplitude modulation unit includes a first resistor, a second resistor, and a first triode; the first end of the first resistor is connected with the first microcontroller, the second end of the first resistor is connected with the base electrode of the first triode, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with the first end of the second resistor, and the second end of the second resistor is connected with the first HDMI interface.
Preferably, the resistance value of the second resistor ranges from 4.7 to 10K Ω.
Preferably, the isolation shaping circuit comprises an isolation comparison unit, a filtering unit and a shaping output unit, the isolation comparison unit is respectively connected with the power supply and a second HDMI interface of the display terminal, the filtering unit is respectively connected with the isolation comparison unit and the shaping output unit, and the shaping output unit is respectively connected with the power supply and a second microcontroller of the display terminal.
Preferably, the isolation comparison unit includes a third resistor, a fourth resistor and a second triode; the first end of the third resistor is connected with the power supply, and the second end of the third resistor is grounded through the fourth resistor; the emitting electrode of the second triode is connected with the second HDMI interface, the base electrode of the second triode is connected with the second end of the third resistor, and the collecting electrode of the second triode is connected with the filtering unit.
Preferably, the filtering unit includes a fifth resistor and a capacitor; the first end of the fifth resistor is connected with the collector of the second triode, the second end of the fifth resistor is grounded through the capacitor, and the second end of the fifth resistor is also connected with the shaping output unit.
Preferably, the shaping output unit includes a sixth resistor, a seventh resistor, and a third transistor; a first end of the sixth resistor is connected with a second end of the fifth resistor, and the second end of the sixth resistor is grounded; a first end of the seventh resistor is connected with the power supply, and a second end of the seventh resistor is connected with the second microcontroller; and the base electrode of the third triode is connected with the second end of the fifth resistor, the emitting electrode of the third triode is grounded, and the collecting electrode of the third triode is connected with the second microcontroller.
Preferably, the shared transmission circuit of the HDMI signal line and the control line comprises a plurality of common mode amplitude modulation circuits and a plurality of isolation shaping circuits; the common-mode amplitude modulation circuits are connected in parallel and then are respectively connected with the first HDMI interface and the first microcontroller; and the plurality of isolation shaping circuits are connected in parallel and then are respectively connected with the second HDMI interface and the second microcontroller.
The invention also provides a television which comprises the shared transmission circuit of the HDMI signal line and the control line.
The television set box is provided with the common mode amplitude modulation circuit and the isolation shaping circuit is arranged on the display terminal, the common mode amplitude modulation circuit receives a first control signal, the first control signal is subjected to amplitude adjustment, and a second control signal obtained after the adjustment is output to the HDMI signal line; the isolation shaping circuit obtains the second control signal from the HDMI signal line, and performs filtering and shaping processing on the second control signal to obtain the first control signal, so that the purpose of transmitting the low-frequency control signal by using a standard HDMI signal line is achieved, the purpose of shared transmission of the HDMI signal line and a control line is achieved, and the cost performance of a product is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a shared transmission circuit for HDMI signal and control lines according to the present invention;
fig. 2 is a schematic structural diagram of a shared transmission circuit of an HDMI signal line and a control line according to an embodiment of the present invention.
The reference numbers indicate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, in an embodiment, the circuit includes a common mode amplitude modulation circuit 100 disposed on a television box and an isolation shaping circuit 200 disposed on a display terminal; wherein the content of the first and second substances,
The common mode amplitude modulation circuit 100 is configured to receive a first control signal, perform amplitude adjustment on the first control signal, and output a second control signal obtained after the amplitude adjustment to an HDMI signal line;
the isolation shaping circuit 200 is configured to obtain the second control signal from the HDMI signal line, and perform filtering and shaping processing on the second control signal to obtain the first control signal.
It can be understood that the split tv generally requires signal lines and control lines to connect the tv box and the display terminal, so as to respectively transmit HDMI signals (such as audio signals) and control signals (such as key control signals).
HDMI (High Definition Multimedia Interface) is a digital video/audio Interface technology that transmits digital signals, which can simultaneously transmit audio and video signals, such signals are usually High frequency differential signals.
It should be noted that the first control signal is a low-frequency control signal, such as a dc control signal, an ac control signal, and the like. According to the embodiment, the characteristic of good common mode characteristic of the HDMI signal line is utilized, some low-frequency control signals which change slowly are added properly, then the low-frequency control signals are transmitted to the rear end through the HDMI signal line to be recognized, and the low-frequency control signals are amplified and shaped, so that the normal HDMI signal line can be utilized to transmit the low-frequency control signals.
In addition, the HDMI signal line is generally used for transmitting the low-frequency control signal when the television is in standby, but not when the television is in normal operation, so that the HDMI signal line is used for transmitting the low-frequency control signal without interfering the HDMI signal line to transmit the high-frequency differential signal.
Further, the common mode amplitude modulation circuit 100 includes an amplitude modulation unit 110, and the amplitude modulation unit 110 is connected to the first HDMI interface P1 of the tv box and the first microcontroller U1 of the tv box, respectively.
It can be understood that, the HDMI signal line has a certain ability to resist common mode signals, and the input signal amplitude is allowed to have a certain swing, i.e. can be varied between 150-. With this reasonable swing, some slowly changing dc or ac control signals can be transmitted, and they are amplitude modulated by the common mode amplitude modulation circuit 100, so that they can be transmitted through the HDMI signal line.
It should be noted that the low-frequency control signals to be transmitted are characterized by low frequency, wide frequency band and overlapping, and must be modulated in order to be suitable for HDMI signal line transmission. The modulation is a process of loading a low-frequency control signal to be transmitted to a high-frequency signal, and the essence is to move the low-frequency control signal to the high-frequency signal, so that the purpose of carrying and transmitting the high-frequency signal is achieved.
Further, the isolation shaping circuit 200 includes an isolation comparison unit 210, a filtering unit 220, and a shaping output unit 230, where the isolation comparison unit 210 is connected to a power VCC and a second HDMI interface P2 of the display terminal, the filtering unit 220 is connected to the isolation comparison unit 210 and the shaping output unit 230, and the shaping output unit 230 is connected to the power VCC and a second microcontroller U2 of the display terminal.
It will be appreciated that the HDMI signal line connects the first HDMI interface P1 of the tv box and the second HDMI interface P2 of the display terminal, so that the common mode amplitude modulation circuit 100 is connected to the isolation shaping circuit 200, thereby transmitting the signal in the tv box to the display terminal.
And after the second control signal obtained after modulation is transmitted to a second HDMI interface P2 of the display terminal through an HDMI signal line, a useful low-frequency control signal is obtained through comparison, filtering and shaping, and the purpose of common transmission is realized.
Furthermore, the shared transmission circuit of the HDMI signal line and the control line comprises a plurality of common-mode amplitude modulation circuits and a plurality of isolation shaping circuits; the common-mode amplitude modulation circuits are connected in parallel and then are respectively connected with the first HDMI interface and the first microcontroller; and the plurality of isolation shaping circuits are connected in parallel and then are respectively connected with the second HDMI interface and the second microcontroller.
It should be noted that, the HDMI signal line has four groups of differential lines, that is, four control signals can be shared and transmitted via the high-frequency differential signal. According to different characteristics of the HDMI internal constant current source, the number of the common mode amplitude modulation circuits is increased according to actual conditions, and when one group of the common mode amplitude modulation circuits is added, a group of isolation shaping circuits needs to be added correspondingly.
In the embodiment, a common mode amplitude modulation circuit is arranged on a television box, an isolation shaping circuit is arranged on a display terminal, the common mode amplitude modulation circuit receives a first control signal, amplitude adjustment is carried out on the first control signal, and a second control signal obtained after adjustment is output to an HDMI signal line; the isolation shaping circuit obtains the second control signal from the HDMI signal line, and performs filtering and shaping processing on the second control signal to obtain the first control signal, so that the purpose of transmitting the low-frequency control signal by using a standard HDMI signal line is achieved, the purpose of shared transmission of the HDMI signal line and a control line is achieved, and the cost performance of a product is greatly improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a shared transmission circuit of an HDMI signal line and a control line according to an embodiment of the present invention.
In this embodiment, the amplitude modulation unit 110 includes a first resistor R1, a second resistor R2, and a first transistor Q1; the first end of the first resistor R1 is connected with the first microcontroller U1, the second end of the first resistor R1 is connected with the base of the first triode Q1, the emitter of the first triode Q1 is grounded, the collector of the first triode Q1 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is connected with the first HDMI interface P1.
It can be understood that the first resistor R1 is a current-limiting resistor, the resistance of the second resistor R2 determines the depth of amplitude modulation, and if the resistance of the second resistor R2 is too large, the back end with a small amplitude is not easy to identify, and if the resistance is too small, the reception of high-frequency differential signals during normal operation of the television may be affected, so the value range of the resistance of the second resistor R2 is preferably 4.7 to 10K Ω.
Further, the isolation comparison unit 210 includes a third resistor R3, a fourth resistor R4, and a second transistor Q2; the first end of the third resistor R3 is connected with the power supply VCC, and the second end of the third resistor R3 is grounded through the fourth resistor R4; an emitter of the second triode Q2 is connected to the second HDMI interface P2, a base of the second triode Q2 is connected to the second end of the third resistor R3, and a collector of the second triode Q2 is connected to the filtering unit 220.
It can be understood that the second control signal obtained after modulation is connected to the emitter of the second transistor Q2 after passing through the HDMI signal line, the base of the second transistor Q2 is connected to two voltage dividing resistors, a third resistor R3 and a fourth resistor R4, and the voltage of the voltage dividing point depends on the level of the pull-down signal of the amplitude modulation unit 110, and generally should be greater than the pull-down voltage of the amplitude modulation unit 110 minus 0.7V.
It should be noted that, when the television is in standby, a dc level exists in the HDMI signal line, when the amplitude modulation unit 110 modulates the low-frequency control signal, the dc level is pulled down, the isolation comparison unit 210 compares the actual level with the reference level, when the actual level is lower than the reference level, the second triode Q2 is turned off, and when the actual level is higher than the reference level, the second triode Q2 is turned on, so as to perform filtering processing on the modulated second control signal.
Further, the filtering unit 220 includes a fifth resistor R5 and a capacitor C1; a first end of the fifth resistor R5 is connected to a collector of the second transistor Q2, a second end of the fifth resistor R5 is grounded via the capacitor C1, and a second end of the fifth resistor R5 is further connected to the shaping output unit 230.
It can be understood that the second control signal is a modulated signal, so that besides the low frequency control signal, there is a high frequency signal with a large amplitude, which may interfere with the normal output. Therefore, the filtering unit 220 is configured to filter the high frequency signal in the second control signal to obtain the low frequency control signal.
Further, the shaping output unit 230 includes a sixth resistor R6, a seventh resistor R7, and a third transistor Q3; a first end of the sixth resistor R6 is connected with a second end of the fifth resistor R5, and a second end of the sixth resistor R6 is grounded; a first end of the seventh resistor R7 is connected to the power supply VCC, and a second end of the seventh resistor R7 is connected to the second microcontroller U2; the base of the third triode Q3 is connected to the second end of the fifth resistor R5, the emitter of the third triode Q3 is grounded, and the collector of the third triode Q3 is connected to the second microcontroller U2.
It can be understood that, after the first control signal is amplitude-modulated by the amplitude modulation unit 110, transmitted by the HDMI signal line, and then passes through the isolation comparison unit 210 and the filtering unit 220, although a low-frequency control signal can be obtained, the phase of the signal is not good at this time, and the waveform edge is irregular, so that the low-frequency control signal is rectified, amplified and output for the display terminal.
The sixth resistor R6 is a voltage dividing resistor, and when the base level of the third transistor Q3 is too high, the transistor is always in a saturated conducting state, so the sixth resistor R6 is added to the base of the third transistor Q3 to adjust the base level of the third transistor Q3. Meanwhile, the sixth resistor R6 is connected in parallel with the capacitor C1 to form a discharge circuit of the capacitor C1, so that the capacitor C1 is discharged through the sixth resistor R6.
The seventh resistor R7 is a load resistor, and the filtered signal needs to be pulled up through the seventh resistor R7 when being output through the collector of the third triode Q3.
In the embodiment, the first control signal is subjected to amplitude modulation through the amplitude modulation unit to obtain the second control signal, and then the second control signal passes through the isolation comparison unit, the filtering unit and the shaping output unit to obtain the first control signal, so that the HDMI signal, various direct current control signals and alternating current control signals can be transmitted through only one HDMI signal wire at the television box and the display terminal, the number of interface cables is greatly simplified, the cost is reduced, and the transmission efficiency is improved.
The invention also provides a television, which comprises the shared transmission circuit of the HDMI signal line and the control line, and the circuit structure of the shared transmission circuit of the HDMI signal line and the control line of the television can refer to the embodiment and is not described herein again; it can be understood that, since the television set of this embodiment adopts the above-mentioned technical solution of sharing the transmission circuit between the HDMI signal line and the control line, the television set has all the above-mentioned beneficial effects.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A shared transmission circuit of an HDMI signal line and a control line is characterized in that the circuit comprises a common mode amplitude modulation circuit arranged on a television box and an isolation shaping circuit arranged on a display terminal; wherein the content of the first and second substances,
the common mode amplitude modulation circuit is used for receiving a first control signal, carrying out amplitude adjustment on the first control signal and outputting a second control signal obtained after adjustment to an HDMI signal line; the common-mode amplitude modulation circuit comprises an amplitude modulation unit, and the amplitude modulation unit is respectively connected with a first HDMI interface of the television box and a first microcontroller of the television box; the amplitude modulation unit comprises a first resistor, a second resistor and a first triode; the first end of the first resistor is connected with the first microcontroller, the second end of the first resistor is connected with the base electrode of the first triode, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with the first end of the second resistor, and the second end of the second resistor is connected with the first HDMI interface;
The isolation shaping circuit is used for acquiring the second control signal from the HDMI signal line, and performing filtering and shaping processing on the second control signal to obtain the first control signal.
2. The HDMI signal line and control line sharing transmission circuit according to claim 1, wherein the resistance value of said second resistor ranges from 4.7 to 10 KOmega.
3. The HDMI signal line and control line shared transmission circuit of claim 1, wherein the isolation shaping circuit comprises an isolation comparison unit, a filtering unit and a shaping output unit, the isolation comparison unit is connected to a power supply and a second HDMI interface of the display terminal, the filtering unit is connected to the isolation comparison unit and the shaping output unit, and the shaping output unit is connected to the power supply and a second microcontroller of the display terminal.
4. The shared transmission circuit of the HDMI signal line and control line according to claim 3, wherein said isolation comparison unit comprises a third resistor, a fourth resistor and a second transistor; the first end of the third resistor is connected with the power supply, and the second end of the third resistor is grounded through the fourth resistor; the emitting electrode of the second triode is connected with the second HDMI interface, the base electrode of the second triode is connected with the second end of the third resistor, and the collecting electrode of the second triode is connected with the filtering unit.
5. The shared transmission circuit of the HDMI signal line and control line according to claim 4, wherein the filtering unit comprises a fifth resistor and a capacitor; the first end of the fifth resistor is connected with the collector of the second triode, the second end of the fifth resistor is grounded through the capacitor, and the second end of the fifth resistor is further connected with the shaping output unit.
6. The HDMI signal line and control line sharing transmission circuit according to claim 5, wherein said shaping output unit comprises a sixth resistor, a seventh resistor and a third transistor; wherein the content of the first and second substances,
a first end of the sixth resistor is connected with a second end of the fifth resistor, and the second end of the sixth resistor is grounded;
a first end of the seventh resistor is connected with the power supply, and a second end of the seventh resistor is connected with the second microcontroller;
and the base electrode of the third triode is connected with the second end of the fifth resistor, the emitting electrode of the third triode is grounded, and the collecting electrode of the third triode is connected with the second microcontroller.
7. The shared transmission circuit of an HDMI signal line and control line of claim 1 wherein said shared transmission circuit of an HDMI signal line and control line comprises a plurality of common mode amplitude modulation circuits and a plurality of isolation shaping circuits; the common mode amplitude modulation circuits are connected in parallel and then are respectively connected with a first HDMI interface of the television box and a first microcontroller of the television box; the isolation shaping circuits are connected in parallel and then are respectively connected with a second HDMI interface of the display terminal and a second microcontroller of the display terminal.
8. A television set comprising the shared transmission circuit of the HDMI signal line and the control line according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811207762.3A CN109302635B (en) | 2018-10-16 | 2018-10-16 | Shared transmission circuit of HDMI signal line and control line and television |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811207762.3A CN109302635B (en) | 2018-10-16 | 2018-10-16 | Shared transmission circuit of HDMI signal line and control line and television |
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| CN109302635B true CN109302635B (en) | 2022-06-10 |
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| CN109302635A (en) | 2019-02-01 |
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