Video signal processing devices
AssigneeCanon Kabushiki Kaisha
InventorsYouichi Yamagishi, Makoto Takayama
Life of this patent
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Abstract
A video signal processing device for separating horizontal and vertical synchronizing signal components from an applied video signal, for forming a field discrimination signal upon discriminating the field represented by each field video signal on the basis of the separated horizontal and vertical synchronizing signal components, and for detecting abnormality or deviation from a predetermined variation in the field discrimination signal due to a defect of the synchronizing signal components or a different type or format of a video signal.
Claims17
A device for processing video signals having horizontal and vertical synchronizing signal components which define video fields, said device comprising:
- (a) first signal separation means for separating horizontal synchronizing components from applied video signals;
- (b) second signal separation means for separating vertical synchronizing signal components from said applied video signals;
- (c) field discrimination signal generating means connected to receive the horizotal and vertical synchronizing signal components separated by said first and second signal separation means and to produce in response thereto, field discrimination signals each having a characteristic which corresponds, respectively, to an associated video field;
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- (d) detection means connected to the output of said field discrimination signal generating means, said detection means being operative to produce an output signal when said field discrimination signals deviate from a predetermined pattern.
A device for processing video signals having horizontal and vertical synchronizing signal components which define video fields, said device comprising:
- (a) first signal separation means for separating horizontal synohronizing signal components from applied video signals;
- (b) second signal separation means for separating vertical synchronizing signal components from said applied video signals;
- (c) field discrimination signal generating means connected to receive the horizontal and vertical synchronizing signal components separated by said first and second signal separation means and to produce in responce thereto, field discrimination signals which correspond, respectively, to associated video fields;
- (d) dummy signal generating means connected to said second signal separating means for receiving said vertical synchronizing signal components and for producing in response thereto a series of signals which simulate interlaced type field discrimination signals;
- (e) output means which operates according to interlaced type field discrimination signals;
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- (f) switch means arranged to selectively connect the outputs of the field discrimination signal generating means and the dummy signal generating means to said output means.
Dependencies are inferred from the claim text.