Digital video modulation and demodulation system
First Claim
1. A system for communicating a binary-coded, digital message from a message originating source to a raster scan display, comprising:
- synchronization means including means for generating raster scan vertical and horizontal synchronization signals;
means for generating message signals corresponding to a binarycoded, digital message at a rate greater than the vertical synchronization rate;
means for generating composite video signals including said synchronization signals and said message signals representing a raster scan picture on a raster scan display;
means for applying the message signals to the composite video signal generating means in timed relation to the synchronization signals so that the message appears as binary-coded, digital brightness modulation at a rate greater than the vertical synchronization rate in one or more viewing areas of the raster scan display picture;
a raster scan display for receiving the composite video signals; and
means at the display for optically detecting the brightness modulation in the areas of the raster scan display picture.
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Abstract
In a television system, a digital video system permits the transmission of data along with the usual television picture. The television picture field includes one or more selectively addressable areas and the data is imprissed on these areas as digital, binary-coded brightness modulations at rates greater than the vertical field rate. At the receiving end of the system, the viewer positions one or more light sensors opposite these screen areas. The light sensors respond to the binary-coded brightness modulations by developing corresponding binary-coded digital electrical signals. The data stream from a light sensor can then be decoded by a demodulator/decoder operated by the viewer.
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Citations
18 Claims
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1. A system for communicating a binary-coded, digital message from a message originating source to a raster scan display, comprising:
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synchronization means including means for generating raster scan vertical and horizontal synchronization signals; means for generating message signals corresponding to a binarycoded, digital message at a rate greater than the vertical synchronization rate; means for generating composite video signals including said synchronization signals and said message signals representing a raster scan picture on a raster scan display; means for applying the message signals to the composite video signal generating means in timed relation to the synchronization signals so that the message appears as binary-coded, digital brightness modulation at a rate greater than the vertical synchronization rate in one or more viewing areas of the raster scan display picture; a raster scan display for receiving the composite video signals; and means at the display for optically detecting the brightness modulation in the areas of the raster scan display picture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of communicating binary-coded, digital messages from a message originating source to a raster scan display, comprising the steps of:
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generating message signals corresponding to a binary-coded digital message; generating vertical and horizontal synchronization signals; combining the message signals and synchronization signals to generate a composite signal; applying the message signals to generate the composite signal at a rate greater than the vertical synchronization rate; displaying the message signals in one or more viewing areas of a raster scan display as a brightness modulation; and optically detecting the brightness modulation. - View Dependent Claims (16)
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17. A system for providing display of a binary-coded, digital message spatially related to a displayed video program presentation on a raster scan display, comprising:
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synchronization means including means for generating raster scan vertical and horizontal synchronization signals; means for generating message signals corresponding to the digital coded message to be displayed; means for generating signals corresponding to a video program presentation; means for generating composite video signals including said synchronizing signals, said message signals and said video program presentation signals; and means for applying the message signals to the composite video signal generating means in timed relation to the synchronization signals so that the message appears as binary-coded, digital brightness modulation in one or 15 more predetermined areas of the raster scan display picture spatially related to the video program presentation. - View Dependent Claims (18)
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Specification