A high-definition video signal line supporting long-distance transmission
A high-definition video and signal line technology, applied in the field of high-definition video signal transmission, can solve the problems of unable to read high level, insufficient signal rise time, unable to meet long-distance transmission, etc., to achieve the effect of reducing the wire diameter and reducing the cost
Active Publication Date: 2022-05-13
EVERPRO TECH COMPANY
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Problems solved by technology
[0004] If the communication distance is long and the signal rise time is not enough, the receiver may not be able to read the high level, unable to perform EDID communication, and then unable to communicate normally.
Therefore, due to the signal on the IIC data line, the length of the DVI and HDMI cables is limited, and some long-distance transmission needs cannot be met.
[0005] Therefore, how to effectively read EDID signals, overcome the defect of insufficient signal rise time, read high-level signals for normal EDID communication, and realize longer-distance signal transmission has become a technical problem that needs to be solved urgently in the prior art
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[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0035] see figure 1 , shows a schematic diagram of the relationship between frequency and period in the prior art, it can be seen that the relationship between frequency and period is: f=1 / T. The time of one cycle corresponding to the clock rate of 100KHz / 50KHz is as follows:
[0036] T1=1 / f=1 / 100000=0.00001S=10us.
[0037] T2=1 / f=1 / 50000=0.00002S=20us.
[0038] Therefore, the present invention is to set a control signal proxy module at the playback end of the data line, that is, the Source end, to reduce the r...
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A high-definition video signal line supporting long-distance transmission, including a sending end, a receiving end, and a control signal agent module at the sending end, which is used to control the transmission of low-speed control signals on the low-speed control signal line, and the analog playback end, through the IIC signal Read the EDID signal of the display terminal at a speed of 1 / 3~1 / 5 of the normal speed, and when the control signal agent module reads the correct EDID signal, forward it to the playback terminal. The present invention reduces the IIC signal data transmission rate, avoids the influence of long-distance capacitance / load on data transmission, does not cause communication abnormality due to too long rising edge time and high level duration is too short, and then realizes longer-distance transmission. The control signal proxy module has a power-off storage function, which can feed back the stored EDID to the player to solve the problem of some lights not being lit. The control signal proxy module continuously sends the IIC name to judge whether the display is connected correctly, thus saving a lot of time. An HPD copper wire is used to reduce costs and reduce wire diameter.
Description
technical field [0001] The present invention relates to a high-definition video signal line, specifically, to a high-definition video signal line that supports long-distance transmission by reading EDID information at low speed and avoiding the impact of long-distance capacitance / load on communication data. High-definition video signal transmission for DVI and HDMI. Background technique [0002] DVI (Digital Visual Interface) and HDMI (High Definition Multimedia Interface) are widely used in PC, DVD, high-definition television (HDTV), high-definition projectors and other equipment. It is based on TMDS (Transition Minimized Differential Signaling) technology to transmit digital media signals at high speed, that is, audio and video signals based on TMDS are mainly transmitted through high-speed media signal lines. [0003] There are three low-speed control signals connected to the video terminal in the transmission circuit: SDA, SCL, HPD. Among them, HPD is a detection signa...
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IPC IPC(8): H04N5/765H04L67/562
CPCH04N5/765H04L67/562
Inventor 李鸽鸽程鹏李艺江辉汤金宽
Owner EVERPRO TECH COMPANY