Browse Prior Art Database

Video Directory System

IP.com Disclosure Number: IPCOM000074849D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Mathis, JR: AUTHOR [+2]

Abstract

Any video terminal in a multiterminal system can choose one of many pictures for display. The number of pictures from which one can be chosen is limited only by the size of the data medium that is used to store the pictures. The number of terminals (TV sets) attached on the system is limited by the distribution capabilities of the CATV system. Communication capability from the terminals to the Control Unit (CU) where the video signal originates is not required.

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Video Directory System

Any video terminal in a multiterminal system can choose one of many pictures for display. The number of pictures from which one can be chosen is limited only by the size of the data medium that is used to store the pictures. The number of terminals (TV sets) attached on the system is limited by the distribution capabilities of the CATV system. Communication capability from the terminals to the Control Unit (CU) where the video signal originates is not required.

The CU produces a continuous video signal of the form shown over the CATV system. Each frame of composite video data is preceded by a frame identifier (FID). The interframe time gap is not critical. The frames need not have any time dependency on each other to maintain sync or for any other reason. Neither is there any time relationship between the FID and the frame (e.g., see frame 2). This will simplify the initial recording of the video tape or other medium. The maximum response time for the system would be T. The terminal consists of the following: 1) Storage capable of storing one video frame
2) A 10 position keyboard 3) Logic circuits. The terminal operates as follows: 1) The FID of the desired frame is entered in the keys of the terminal. Each frame lists the FIDs for the next frame of the sequence. 2) Once the FID has been entered, the terminal searches the signal received from the CU for the matching FID. Once a match has been found, the write circuits of the video storage u...