| 摘要 |
A visual service that employs the full facilities of a television communication channel on an intermittent basis. A user chooses certain still picture television frames that contain subject matter of interest to him, and conveys these choices to a central transmitting facility. These are then contiguously assembled for transmission to the user, perhaps with frames of other users as well, in a "burst" of such video frames. These frames are stored at the user's location, and can be brought up for viewing as often as desired. A vertical interval code may be used in the system for frame identification and to reproduce only what the user has chosen.
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