| 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 from a selection stored on the video tape reproducers (3, 4, 5--n) and conveys these choices to a central controller (1) via an incoming channel (2). These are then contiguously assembled in a tape assembler (8) perhaps with frames for other users as well, and are then transmitted to the user in a "burst" of such video frames. A local controller (Figure 3 not shown) then selects those frames which have been requested by the user these are then 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 those frames that the user has requested. <IMAGE> |
