CN112637537A - HDMI signal extension fixture - Google Patents
HDMI signal extension fixture Download PDFInfo
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- CN112637537A CN112637537A CN202011399128.1A CN202011399128A CN112637537A CN 112637537 A CN112637537 A CN 112637537A CN 202011399128 A CN202011399128 A CN 202011399128A CN 112637537 A CN112637537 A CN 112637537A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 230000008878 coupling Effects 0.000 claims abstract description 23
- 238000010168 coupling process Methods 0.000 claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 claims abstract description 23
- 230000003321 amplification Effects 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 19
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000008054 signal transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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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
-
- 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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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention provides an HDMI signal extension device, which comprises a transmitter and a receiver, wherein the transmitter comprises: the interface circuit comprises a first HDMI interface, a first RJ45 interface, a first network transformer, a signal amplification circuit, a power interface, a first voltage circuit, a second voltage circuit, a third voltage circuit and a first filtering and coupling circuit; the receiver comprises a second HDMI interface, a second RJ45 interface, a second network transformer, a comparator circuit, a voltage stabilizing circuit and a second filtering and coupling circuit. The invention respectively boosts the audio and video signals and the digital control signals to different voltages at the transmitter part and then couples the signals, and arranges the comparator circuit at the receiver part to effectively separate the digital control signals, thereby reducing the interference between the audio and video signals and the digital control signals transmitted by using the same cable, effectively improving the transmission distance and realizing the longer-distance transmission of the HDMI signals.
Description
Technical Field
The invention relates to the technical field of audio and video signal transmission, in particular to an HDMI signal extension device.
Background
HDMI (High Definition Multimedia Interface) is a digital video/audio Interface technology conforming to the High Definition time standard, and can be used in set-top boxes, DVD players, personal computers, and televisions. HDMI can transmit audio and video signals simultaneously, can transmit uncompressed high-definition video and multi-channel audio data with high quality, and has the highest data transmission speed of 5 Gbps. In order to realize long-distance transmission of HDMI signals, a network cable is generally used as a transmission medium.
The existing scheme for transmitting the HDMI signals by adopting the single network cable directly couples the audio and video signals with the digital control signals and transmits the signals through the network cable, and because the audio and video signals and the digital control signals have interference in coupling transmission, the transmission distance of the existing technical scheme is only 30-60 meters, and the signal transmission at a longer distance is difficult to realize.
Disclosure of Invention
In order to solve the above problems, the present invention provides an HDMI signal extension apparatus, wherein a transmitter portion of the HDMI signal extension apparatus respectively boosts an audio/video signal and a digital control signal to different voltages for coupling, and a receiver portion of the HDMI signal extension apparatus is provided with a comparator circuit to effectively separate the digital control signal, thereby enabling a longer distance transmission of the HDMI signal.
The invention is realized by the following technical scheme:
the invention provides an HDMI signal extension device, which comprises a transmitter and a receiver, wherein the transmitter comprises:
the first HDMI interface is used for receiving an HDMI signal from the host;
a first RJ45 interface for connecting with the receiver;
the first network transformer is coupled with the audio and video signal pin of the first HDMI interface and is used for isolating and amplifying the transmitted audio and video signals;
the signal amplification circuit is coupled with a digital control signal pin of the first HDMI interface and used for performing voltage amplification on the transmitted digital control signal;
the power interface is used for connecting an external direct-current power supply;
the first voltage circuit is respectively coupled with the first network transformer and the power interface and is used for providing a first reference voltage for the first network transformer so as to enable the audio and video signal voltage amplitude to be increased to the first reference voltage;
the second voltage circuit is respectively coupled with the signal amplification circuit and the power interface and is used for providing a second reference voltage for the signal amplification circuit so as to increase the voltage amplitude of the digital control signal to the second reference voltage;
a third voltage circuit coupled to the power interface for boosting an external dc power voltage to a third reference voltage to form a power signal;
and the first filtering and coupling circuit is respectively coupled with the first network transformer, the signal amplification circuit, the third voltage circuit and the first RJ45 interface and is used for coupling the digital control signal and the power supply signal to the audio and video signal for transmission.
Further, the receiver includes:
the second HDMI is used for sending an HDMI signal to the display terminal;
a second RJ45 interface for connecting with the transmitter;
the second network transformer is coupled with the audio and video signal pin of the second HDMI interface and used for isolating the transmitted audio and video signals;
a comparator circuit coupled to a digital control signal pin of the second HDMI interface for extracting the transmitted digital control signal;
the voltage stabilizing circuit is coupled with the signal amplifying circuit and used for providing power supply for the comparator circuit;
and the second filtering and coupling circuit is respectively coupled with the second network transformer, the comparator circuit, the voltage stabilizing circuit and the second RJ45 interface and is used for separating the digital control signal and the power supply signal which are coupled with the audio and video signal.
As an improvement, the transmitter further comprises:
a first control signal interface for receiving an external control signal;
and the first microcontroller is respectively coupled with the first control signal interface and the signal amplification circuit and is used for converting the received external control signal into a serial control signal.
As an improvement, the transmitter further comprises:
and the transmitting end HDMI interface chip is respectively coupled with the first HDMI interface and the first network transformer and is used for enhancing the audio and video signals.
As an improvement, the receiver further comprises:
the second control signal interface is used for receiving an external control signal;
the second microcontroller is coupled with the second control signal interface and used for converting the received external control signal into a serial control signal for transmission;
and the receiving end HDMI interface chip is respectively coupled with the second HDMI interface, the second network transformer, the comparator circuit and the second microcontroller, is used for integrating the audio and video signals, the digital control signals and the serial control signals, and transmits the integrated signals to the second HDMI interface.
As a refinement, the first reference voltage differs from the second reference voltage by 30% in magnitude.
As a modification, the first reference voltage is 3.3V, the second reference voltage is 5V, and the third reference voltage is 12V.
The invention has the beneficial effects that:
the invention respectively boosts the audio and video signals and the digital control signals to different voltages at the transmitter part and then couples the signals, and arranges the comparator circuit at the receiver part to effectively separate the digital control signals, thereby reducing the interference between the audio and video signals and the digital control signals transmitted by using the same cable, effectively improving the transmission distance and realizing the longer-distance transmission of the HDMI signals. When CAT5E or CAT6 cable is adopted for transmission, the transmission distance can reach 100-150 meters.
Drawings
Fig. 1 is a schematic structural diagram of an HDMI signal extension apparatus according to the present invention;
FIG. 2 is a schematic diagram of a peripheral circuit of the network transformer of the transmitting end of the present invention;
FIG. 3 is a schematic structural diagram of a main device of a network transformer at a transmitting end according to the present invention;
FIG. 4 is a schematic diagram of a transmit side signal amplification circuit of the present invention;
fig. 5 is a schematic diagram of a transmit side filtering and coupling circuit of the present invention.
Detailed Description
In order to more clearly and completely explain the technical scheme of the invention, the invention is further explained with reference to the attached drawings.
Referring to fig. 1, the present invention provides an HDMI signal extension apparatus, which includes a transmitter 100 and a receiver 200. Transmitter 100 includes HDMI interface 101, RJ45 interface 102, network transformer 103, signal amplification circuit 104, power supply interface 105, first voltage circuit 106, second voltage circuit 107, third voltage circuit 108, and filtering and coupling circuit 109. The HDMI interface 101 is configured to receive an HDMI signal from a host, four pairs of differential ac signal pins (i.e., pins 1, 3, 4, 6, 7, 9, 10, and 12) in the HDMI interface 101 for transmitting audio/video signals are coupled to a signal input terminal of the network transformer 103, a signal output terminal of the network transformer 103 is connected to the RJ45 interface 102 through the filtering and coupling circuit 109, and pins (e.g., pins 15 and 16 for transmitting HDCP and EDID signals and pin 19 for transmitting HPD hot plug signals) in the HDMI interface 101 for transmitting digital signals are connected to the filtering and coupling circuit 109 through the signal amplifying circuit 104. The power interface 105 is used for connecting an external direct-current power supply, the power interface 105 is respectively connected with a first voltage circuit 106, a second voltage circuit 107 and a third voltage circuit 108, the first voltage circuit 106 converts the external direct-current power supply voltage into a first reference voltage and supplies the first reference voltage to the network transformer 103, the second voltage circuit 107 converts the external direct-current power supply voltage into a second reference voltage and supplies the second reference voltage to the signal amplification circuit 104, and the third voltage circuit 108 boosts the external direct-current power supply voltage into a third reference voltage to form a power supply signal and supplies the power supply signal to the filtering and coupling circuit 109.
The peripheral circuit of the network transformer 103 is shown in fig. 2, and the internal structure of its main device U1 is shown in fig. 3, and the first voltage circuit 106 provides the first reference voltage (VCC33) to the network transformer 103, so as to raise the voltage amplitude of the output signal of the network transformer 103 to the first reference voltage (VCC 33).
The signal amplification circuit 104 provides the second reference voltage (5V) to the signal amplification circuit 104 through the second voltage circuit 107, as shown in fig. 4, which will make the voltage amplitude of the digital control signals (e.g., RX _ IR, TX _ IR, and EDID) amplified by the amplifier U3 rise to the second reference voltage (5V).
The filtering and coupling circuit 109 is shown in fig. 5, wherein the digital control signals (e.g., RX _ IR, TX _ IR, EDID) and the power supply signal (12V) are coupled to the audio/video signals (DO +, D0-, D1+, D1-, D2+, D2-, CLK +, and CLK-) and finally transmitted to the receiver 200 through the network cable via the RJ45 interface 102.
The receiver 200 includes an HDMI interface 201, an RJ45 interface 202, a network transformer 203, a comparator circuit 204, a voltage stabilizing circuit 205, and a filtering and coupling circuit 206. The RJ45 interface 202 receives signals from the transmitter 100, the filtering and coupling circuit 206 separates digital control signals and power signals coupled to the audio/video signals, the audio/video signals are transmitted to the audio/video signal pins of the HDMI interface 201 through the network transformer 203, the digital control signals are separated into effective signals by the comparator circuit 204 and transmitted to the digital control signal pins of the HDMI interface 201, and the power signals supply power to the comparator circuit 204 through the voltage stabilizing circuit 205.
The filtering and coupling circuit 206 of the receiver 200 is identical in construction to the filtering and coupling circuit 109 of the transmitter 100. The network transformer 203 of the receiver 200 adopts a network transformer structure having only a signal isolation function. The fourth reference voltage is set by the comparator circuit 204, and when the digital control signal voltage is higher than the fourth reference voltage, the fourth reference voltage will be able to be transmitted to the digital control signal pin of the HDMI interface 201 through the comparator circuit 204.
The working principle of the invention is as follows:
the transmitter adopts a network transformer for boosting and isolating power to boost the voltage amplitude of the audio and video signal to a first reference voltage, adopts a signal amplifying circuit to boost the voltage amplitude of the digital control signal to a second reference voltage, and then adopts a filtering and coupling circuit to couple the boosted audio and video signal with the digital control signal. In addition, in order to ensure the effective separation of the digital control signal, a comparator circuit is specially arranged on the receiver, the digital control signal voltage after transmission is higher than a fourth reference voltage and can be transmitted to the HDMI interface through the comparator circuit, in order to realize the function, a filtering and coupling circuit of the transmitter also boosts the power supply signal to a third reference voltage and couples the third reference voltage to the audio and video signal for transmission, a voltage stabilizing circuit is arranged on the receiver, and the separated power supply signal is supplied with power to the comparator circuit after being stabilized.
When the method is adopted for signal transmission, the audio and video signals adopt the rate of 1.65Gbit/s, the digital control signals adopt the rate of 1 MHz-1 MHz, and when the amplitude difference between the first reference voltage and the second reference voltage is 30%, for example, the first reference voltage is 3.3V, and the second reference voltage is 5V, the interference between the audio and video signals transmitted by the same cable and the digital control signals can be reduced by adopting the method for transmission, and the transmission distance can be effectively increased. When CAT5E or CAT6 cable is adopted for transmission, the transmission distance can reach 100-150 meters. When the power signal is coupled in, the power signal is boosted to a third reference voltage, for example, 12V, which has higher power transmission efficiency, and meanwhile, does not generate interference to the transmitted data signal.
As a modified embodiment, referring to fig. 1, the transmitter 100 further includes a control signal interface 110 and a microcontroller 111. The control signal interface 110 is used to receive external control signals, such as USB signals, infrared signals, and the like. The microcontroller 111 is coupled to the control signal interface 110 and the signal amplification circuit 104, respectively, for converting the received external control signal into a serial control signal. The serial control signal is also amplified by the signal amplifying circuit 104 and then coupled to the audio/video signal by the filtering and coupling circuit 109 for transmission.
As a modified embodiment, referring to fig. 1, the transmitter 100 further includes a transmitter HDMI interface chip 112, which is respectively coupled to the first HDMI interface 101 and the first network transformer 103, for enhancing the audio/video signal.
As a modified embodiment, the receiver 200 further includes a control signal interface 207, a microcontroller 208, and a sink HDMI interface chip 209. The control signal interface 207 is used to receive external control signals. The microcontroller 208 is coupled to the control signal interface 207 for converting the received external control signal into a serial control signal for transmission. The receiving-end HDMI interface chip 208 is coupled to the second HDMI interface 201, the second network transformer 203, the comparator circuit 204, and the second microcontroller 208, respectively, and is configured to integrate the audio/video signal, the digital control signal, and the external control signal, and transmit the integrated signal to the second HDMI interface 201.
Of course, the present invention may have other embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative effort, and all of them are within the protection scope of the present invention.
Claims (7)
1. An HDMI signal extension apparatus comprising a transmitter (100) and a receiver (200), wherein the transmitter (100) comprises:
a first HDMI interface (101) for receiving an HDMI signal from a host;
a first RJ45 interface (102) for connection with the receiver (200);
the first network transformer (103) is coupled with an audio/video signal pin of the first HDMI (101) and is used for isolating and amplifying voltage of the transmitted audio/video signal;
a signal amplification circuit (104) coupled to a digital control signal pin of the first HDMI interface (101) for voltage-amplifying the transmitted digital control signal;
a power supply interface (105) for connecting an external DC power supply;
a first voltage circuit (106) coupled to the first network transformer (103) and the power interface (105), respectively, for providing a first reference voltage to the first network transformer (103) so as to raise the audio/video signal voltage amplitude to the first reference voltage;
a second voltage circuit (107) coupled to the signal amplification circuit (104) and the power interface (105), respectively, for providing a second reference voltage to the signal amplification circuit (104) to increase the magnitude of the digital control signal voltage to the second reference voltage;
a third voltage circuit (108) coupled to the power interface (105) for boosting an external dc supply voltage to a third reference voltage to form a supply signal;
and the first filtering and coupling circuit (109) is respectively coupled with the first network transformer (103), the signal amplification circuit (104), the third voltage circuit (108) and the first RJ45 interface (102) and is used for coupling the digital control signal and the power supply signal to the audio and video signal for transmission.
2. An HDMI signal extension device according to claim 1, said receiver comprising:
a second HDMI interface (201) for transmitting an HDMI signal to the display terminal;
a second RJ45 interface (202) for connection with the transmitter (100);
the second network transformer (203) is coupled with an audio/video signal pin of the second HDMI (201) and used for isolating the transmitted audio/video signal;
a comparator circuit (204) coupled to a digital control signal pin of the second HDMI interface (201) for extracting the transmitted digital control signal;
a voltage stabilizing circuit (205) coupled to the signal amplification circuit (204) for providing power to the comparator circuit (204);
and the second filtering and coupling circuit (206) is respectively coupled with the second network transformer (203), the comparator circuit (204), the voltage stabilizing circuit (205) and the second RJ45 interface (202) and is used for separating the digital control signal and the power supply signal which are coupled on the audio and video signal.
3. The HDMI signal extension means of claim 1, wherein said transmitter (100) further comprises:
a first control signal interface (110) for receiving an external control signal;
a first microcontroller (111) coupled to the first control signal interface (110) and the signal amplification circuit (104), respectively, for converting a received external control signal into a serial control signal.
4. The HDMI signal extension means of claim 1, wherein said transmitter (100) further comprises:
and the transmitting end HDMI interface chip (112) is respectively coupled with the first HDMI interface (101) and the first network transformer (103) and is used for enhancing the audio and video signals.
5. An HDMI signal extension arrangement as claimed in claim 2, wherein said receiver (200) further comprises:
a second control signal interface (207) for receiving an external control signal;
a second microcontroller (208) coupled to the second control signal interface (207) for converting the received external control signal into a serial control signal for transmission;
and the receiving end HDMI interface chip (209) is respectively coupled with the second HDMI interface (201), the second network transformer (203), the comparator circuit (204) and the second microcontroller (208), and is used for integrating the audio/video signal, the digital control signal and the serial control signal and transmitting the signals to the second HDMI interface (201).
6. The HDMI signal extension means of claim 1 wherein said first reference voltage differs from said second reference voltage by 30% in magnitude.
7. The HDMI signal extension apparatus of claim 6, wherein said first reference voltage is 3.3V, said second reference voltage is 5V, and said third reference voltage is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011399128.1A CN112637537A (en) | 2020-12-01 | 2020-12-01 | HDMI signal extension fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011399128.1A CN112637537A (en) | 2020-12-01 | 2020-12-01 | HDMI signal extension fixture |
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| Publication Number | Publication Date |
|---|---|
| CN112637537A true CN112637537A (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011399128.1A Pending CN112637537A (en) | 2020-12-01 | 2020-12-01 | HDMI signal extension fixture |
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Citations (7)
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| CN101765994A (en) * | 2007-07-25 | 2010-06-30 | 雷德米尔技术有限公司 | Self calibrating cable for a high definition digital video interface |
| US20130340024A1 (en) * | 2012-06-14 | 2013-12-19 | Phasehd Inc. | Apparatus for extending hdmi signal transmission |
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| CN207652571U (en) * | 2017-12-17 | 2018-07-24 | 苏州视泰克电子科技有限公司 | A kind of hundred meter level HDMI high definition cable extenders |
| CN108376538A (en) * | 2018-04-27 | 2018-08-07 | 京东方科技集团股份有限公司 | Connector and display device for display device |
| CN207869296U (en) * | 2017-12-28 | 2018-09-14 | 天津益华微电子有限公司 | 4K-HDMI based on high resolution audio and video live broadcast system extends receiver |
| CN214045810U (en) * | 2020-12-01 | 2021-08-24 | 深圳市联鸿泰电子有限公司 | HDMI signal extension fixture |
-
2020
- 2020-12-01 CN CN202011399128.1A patent/CN112637537A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101765994A (en) * | 2007-07-25 | 2010-06-30 | 雷德米尔技术有限公司 | Self calibrating cable for a high definition digital video interface |
| US20130340024A1 (en) * | 2012-06-14 | 2013-12-19 | Phasehd Inc. | Apparatus for extending hdmi signal transmission |
| US20140211095A1 (en) * | 2013-01-28 | 2014-07-31 | Adder Technology Limited | Digital video and data transmission |
| CN207652571U (en) * | 2017-12-17 | 2018-07-24 | 苏州视泰克电子科技有限公司 | A kind of hundred meter level HDMI high definition cable extenders |
| CN207869296U (en) * | 2017-12-28 | 2018-09-14 | 天津益华微电子有限公司 | 4K-HDMI based on high resolution audio and video live broadcast system extends receiver |
| CN108376538A (en) * | 2018-04-27 | 2018-08-07 | 京东方科技集团股份有限公司 | Connector and display device for display device |
| CN214045810U (en) * | 2020-12-01 | 2021-08-24 | 深圳市联鸿泰电子有限公司 | HDMI signal extension fixture |
Non-Patent Citations (1)
| Title |
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| FRANKIE: "让高清信号传得更远——AudioQuest HDMI Extender HDMI延长器", 《家庭影院技术》, 1 March 2008 (2008-03-01) * |
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