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Video-scramble-system-and-equipment

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Video scramble system and equipment

Details

Inventors: Hashimoto, Takashi;
Assignee: Pioneer Electronic Corporation (Tokyo, JP)
Primary Examiner: Buczinski; Stephen C.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, Turner; Richard C., Baisvent; Marie Claire

The object of the present invention is to provide various scramble systems and equipments for embodying the scramble systems for omitting unqualified viewers in a pay TV system such as CATV. One of the scramble system according to the present invention is characterized in that a horizontal blanking interval and a video signal interval in at least one specified horizontal scanning line are shifted with respect to the time axis thereof to be transmitted in combination with other horizontal scanning lines in which no shifting operation is conducted. Another scramble system is characterized in that a horizontal line in which a horizontal blanking interval is deleted and the remained video signal interval is shifted within the time interval equal to the thus deleted horizontal blanking interval in addition to the above system. A further scramble system apart from these systems is characterized in that a pedestal part of a specified horizontal scanning line within a vertical blanking interval is compressed with respect to the time axis thereof, whereas a pedestal part of another desired horizontal scanning line within the same field is expanded for a time interval corresponding to the thus compressed pedestal part. And, a still further scramble system is characterized in that an audio signal as well as the video signal is also scrambled.

DETAILED DESCRIPTION A first scramble system according to the present invention is characterized in that two kinds of horizontal scanning lines are transmitted in a combined form, wherein one type is a horizontal scanning line in which a Horizontal Blanking Interval (hereinafter this may be referred to simply as HBI) signal and a Video Signal Interval (hereinafter this may be referred to simply VSI) signal are shifted in time series mode each other, and the other type is a horizontal scanning line (hereinafter this may be referred to simply as H line) in which no shifting operation is conducted therein.
A second scramble system according to the present invention is characterized in that three kinds of horizontal scanning lines are transmitted in a combined form, wherein one type is a horizontal scanning line in which HBI signal and a VSI signal are shifted in time series mode each other, the second type is a horizontal scanning line in which no shifting operation is conducted therein, and the other type is a horizontal line in which a HBI signal is deleted and the remained VSI signal is shifted within the time interval equal to the thus deleted HBI signal.
A third scramble system according to the present invention is characterized in that a pedestal part of the specified horizontal scanning line within a vertical blanking interval is compressed with respect to the time axis thereof, and a pedestal part of another desired horizontal scanning line within the same field is expanded for a time interval corresponding to the thus compressed pedestal part.
A fourth scramble system according to the present invention is characterized in that a sound signal is also scrambled in addition to any of the above first, second and third video signal scramble systems.
A first scramble equipment according to the present invention is composed by applying the first scramble system, and has a feature which has such means that a HBI signal and a VSI signal in a horizontal scanning line are shifted in time series mode each other

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