| 摘要 |
A CATV terminal unit descrambling operation is disclosed wherein unrecovered video pulse portions, existing because a scrambling compression period is longer than a descrambling expansion period, are eliminated. The unrecovered pulse portions are eliminated by substituting a signal having a level equal to or near a pedestal level of the video signal during time intervals when an unrecovered pulse portion is expected. The elimination of the unrecovered pulse portions removes the undesirable effects of luminance changes and turnover noises.
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