The video extender with cable length detection for auto compensating video signal

• Main Authors: Chen-Wei Ho, 何政衛
• Other Authors: Mu-Der Jeng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/08709369702257343498

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 97 === As the development of computer technology flourishes, and the advancement of peripherals that follows, the demand for video extension in areas such as home entertainment, digital signage in theaters or elevators, or remote data centers management, are all increasing as well. Although the video extension technology is available now to meet the demand, the poor video quality and inconvenient operation of the current technology are often the market response. The objective of this thesis is to discuss video extension technology and to propose a hardware design with corresponding calculations that could enhance the video quality, transfer stability, and user friendly operation. The first discussion in the report involves the technology of video interface and the analysis of its transmission structure over distance and the relative limitations. Under the discussed circumstances, the characteristics of those selections of network cables with better potential can be used to analyze the transmission feature of medium. Furthermore, we could use signal detection techniques to measure signal transmissions and decays, and utilize compensation solution to restore those decayed signals. Another discussion in the report focuses on how the effect of hardware circuit design has on the structure of transmission through network cables over long distances, including detection of signal release, transmission, and reception, as well as to rectify waveform, to compare voltage, and to compensate video signal. Furthermore, through the integration of firmware and hardware, I could develop a set of solution for recurring cycle of compensation process in order to improve manual compensation or less accurate auto compensation methods. With this design, I could improve the compensation result with better speed and accuracy. Although article discussed a lot on the association between hardware circuit and firmware, in order to prove my theory in the article, I developed a real demonstration sample that could explain the methods in my discussions could be done in real life.