A apparatus and apparatus for compensating for video insertion loss due to transmission
over long twisted pair cable lines is presented. Transmission of video over twisted
pair cable is advantageous because of its superior cost advantage over coaxial
cable. However, twisted pair cables have significant loss characteristics at the
higher frequencies (i.e., broadband) compared to coaxial cables. At a transmitter
station, the video signal is amplified in the high frequency region for possible
skin effect losses thereby brute forcing the high frequency components to the receiving
station. At the receiver station, the video signal is further compensated for diffusion
line and skin effect losses. The total skin effect compensation applied in both
the transmitter and receiver stations is such that the square root of frequency
characteristics of skin effect losses is compensated for. Thus, at the receiving
station, the high frequency compensation added at the transmitter to brute force
the high frequency components to the receiving station may be removed if found
excessive. Additionally, compensation is included to adjust for skew that may occur
because of irregularities between the various twisted pairs used to transmit the
individual video components. Non-minimum phase type filters are used to inject
delay into the faster arriving signals so that they may coincide in phase with
later arriving signals resulting in a true reproduction of the video.