Optical decoder
First Claim
Patent Images
1. A coded information system, comprising:
- a raster scan display having displayed on the screen thereof at least a first spot which is repetitively regenerated for a plurality of successive fields and blanked for a first predetermined number of successive fields between each regeneration for said plurality of fields, and at least a second spot which is repetitively regenerated for a plurality of successive fields and blanked for a second predetermined number of successive fields between each regeneration for said plurality of fields, said first and second spots being continuously generated for a plurality of sequences of spot regeneration and blanking periods; and
an optical decoder operatively responsive to either of said first and second spots to denote whether said spot was blanked for said first or second predetermined number of fields.
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Accused Products
Abstract
An optical decoder to permit differentiating between at least two flashing spots displayed on a cathode ray tube screen is provided by a photosensor and an electrical circuit which is responsive to the absence of flashes during a flashing sequence which is different for the two spots and not distinguishable by the naked eye.
21 Citations
19 Claims
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1. A coded information system, comprising:
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a raster scan display having displayed on the screen thereof at least a first spot which is repetitively regenerated for a plurality of successive fields and blanked for a first predetermined number of successive fields between each regeneration for said plurality of fields, and at least a second spot which is repetitively regenerated for a plurality of successive fields and blanked for a second predetermined number of successive fields between each regeneration for said plurality of fields, said first and second spots being continuously generated for a plurality of sequences of spot regeneration and blanking periods; and an optical decoder operatively responsive to either of said first and second spots to denote whether said spot was blanked for said first or second predetermined number of fields. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15)
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9. An optical decoder responsive to at least a first spot displayed on a raster scan display which is repetitively regenerated for a plurality of successive fields and blanked for a first predetermined number of successive fields between each regeneration for said plurality of fields, and at least a second displayed spot which is repetitively regenerated for a plurality of successive fields and blanked for a second predetermined number of successive fields between each regeneration for said plurality of fields, said first and second spots being continuously generated for a plurality of sequences of spot regeneration and blanking periods, comprising:
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an optical sensor; and an electrical circuit coupled to said optical sensor for providing a first output responsive to the first spot and a second different output responsive to the second spot. - View Dependent Claims (10, 11, 12, 13, 14)
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16. A coded information system, comprising:
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a raster scan display having displayed on the screen thereof at least a first spot which is repetitively regenerated for a plurality of successive fields and blanked for a first predetermined number of successive fields between each regeneration for said plurality of fields, and at least a second spot which is repetitively regenerated for a plurality of successive fields and blanked for a second predetermined number of successive fields between each regeneration for said plurality of fields; and an optical decoder operatively responsive to either of said first and second spots to denote whether said spot was blanked for said first or second predetermined number of fields, said optical decoder including an optical sensor for converting said displayed spot into electrical signals and an electrical circuit coupled to said optical sensor for providing a first output responsive to said first spot and a second different output respective to said second spot, said electrical circuit including a delay circuit which will respond differently for electrical signals generated in response to said first spot and electrical signals generated in response to said second spot, said delay circuit including a one-shot multivibrator having a time constant which will cause the multivibrator to time out for electrical signals generated in response to said first spot and will not time out for electrical signals generated in response to said second spot.
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17. A coded information system, comprising:
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a raster scan display having displayed on the screen thereof at least a first spot which is repetitively regenerated for a plurality of successive fields and blanked for a first predetermined number of successive fields between each regeneration for said plurality of fields, and at least a second spot which is repetitively regenerated for a plurality of successive fields and blanked for a second predetermined number of successive fields between each regeneration for said plurality of fields; an optical decoder operatively responsive to either of said first and second spots to denote whether said spot was blanked for said first or second predetermined number of fields, said optical decoder including an optical sensor for converting said displayed spots into electrical signals and an electrical circuit couled to said optical sensor for providing a first output responsive to said first spot and a second different output responsive to said second spot; and means for providing a distinctive aural indication denoting whether said optical sensor received information from said first or second spot.
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18. An optical decoder responsive to at least a first spot displayed on a raster scan display which is repetitively regenerated for a plurality of successive fields and blanked for a first predetermined number of successive fields between each regeneration for said plurality of fields, and at least a second displayed spot which is repetitively regenerated for a plurality of successive fields and blanked for a second predetermined number of successive fields between each regeneration for said plurality of fields, comprising:
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an optical sensor; and an electrical circuit coupled to said optical sensor for providing a first output responsive to the first spot and a second different output responsive to the second spot, said electrical circuit including a delay circuit which will respond differently for electrical signals generated in response to the first spot and electrical signals generated in response to the second spot, said delay circuit including a one-shot multivibrator having a time constant which will cause the multivibrator to time out for electrical signals generated in response to the first spot and will not time out for electrical signals generated in response to the second spot.
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19. An optical decoder responsive to at least a first spot displayed on a raster scan display which is repetitively regenerated for a plurality of successive fields and blanked for a first predetermined number of successive fields between each regeneration for said plurality of fields, and at least a second displayed spot which is repetitively regenerated for a plurality of successive fields and blanked for a second predetermined number of successive fields between each regeneration for said plurality of fields, comprising:
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an optical sensor; an electrical circuit coupled to said optical sensor for providing a first output responsive to the first spot and a second different output responsive to the second spot; and means for providing a distinctive aural indication denoting whether said optical sensor received information from said first or second spot.
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Specification