Circuit unit for automatic measuring length of network transmission line
A technology of transmission line length and circuit device, which is applied in televisions, electrical components, color televisions, etc., can solve problems such as inability to distinguish the operation screen of the display screen 106, video signal attenuation, poor image quality of the display screen 106, etc., and increase convenience and work efficiency
Inactive Publication Date: 2004-05-05
ATEN INT CO
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[0004] Specifically, since different forms of network transmission lines 104, such as shielding twisted pair (Shielding Twisted Pair, STP) or foil twisted pair (Foil Twisted Pair, FTP), have different frequency responses, so that When the video signal is transmitted, the VGA video signal will have the problem of signal attenuation. What is more serious is that when the network transmission line exceeds 10 meters, the video signal will be greatly attenuated, resulting in poor image quality on the display screen 106, or even indistinguishable Display the operation screen on the screen 106
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[0045] The present invention describes in detail a circuit device for automatically detecting the length and frequency response quality of a network transmission line to generate an optimal video signal. The network transmission line can be, for example, an RJ-45 network line. During operation, a wave detection device is used to detect Measure the frequency response of the reference signal passing through the network transmission line, and the frequency response of the reference signal is related to the length of the network transmission line, and use the result of the frequency response to perform signal compensation on the video signal so that the best video signal is output to the display Above, a clearly visible image frame is generated, wherein the video signal can be a video signal with red, green, blue (RGB), for example, a VGA signal, an SVGA signal or other signals with similar specifications.
[0046] See first figure 2 , which is a circuit device 200 for automatica...
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The invented circuit at least includes the detector arrangement, A / D converter, the microprocessor, the frequency compensation circuit and the circuit network transmission line. For example the transmission line can be the RJ-45 circuit network line. The frequency response of the reference signal is sensed by use of the detector arrangement to generate the detection signal. The detection signal is converted to the digital signal by the A / D converter, combining with the controlling signal output from the microprocessor make the frequency compensation circuit be controlled properly based on the RC circuit and the control signal. Thus, the attenuation compensation is carried out for the video signal so as to generate the optimal video signal. So the clear image is formed on the display in order to increase the convenience and operation efficiency.
Description
technical field [0001] The invention relates to a detection circuit for the length of a transmission line, in particular to a circuit device for automatically detecting the length of a network transmission line. Background technique [0002] With the advancement of the electronic industry and the rapid development of computer technology, more and more electronic products are widely used in daily life, which improves the convenience of the work process and the quality of life, especially the display screen in the computer system. For example, industrial computers are used for remote control. In the display screen, the "additive color method" is usually used to deal with the color change, in which three colors red (Red), green (Green) and blue (Blue) are the main colors, and all color changes can be made by these three colors. Color overlap occurs. In addition, because the display screen uses an analog output method, the color of the image screen can be adjusted by controlli...
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IPC IPC(8): H04N5/14
Inventor 陈尚仲
Owner ATEN INT CO