An improved equalization system has been developed for video cable. Equalizer design is based on an analysis of cable performance, which shows that an analytic expression can be obtained for the loss and phase of the cable over the video band. Fixed equalizers were designed to handle the loss characteristics of a nominal cable pair and manually-adjustable equalizers to handle expected variations. New wideband approximation methods were used to match arbitrary impedance or loss characteristics to close tolerances. With these equalizers an initial cable distortion of a hundred or more db may be reduced to less than 0.05 db.
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Rounds et al. (1955) studied this question.
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