Digital video effect system comprising only one memory of a conventional capacity
Device for delineating zones in a video image display
Synchronization of digital memory with TV signal having interlace Patent #: 4281345
ApplicationNo. 06/365775 filed on 04/05/1982
US Classes:348/589, Including insertion of characters or graphics (e.g., titles)345/573, Plural address generators345/629Merge or overlay
ExaminersPrimary: Masinick, Michael A.
Attorney, Agent or Firm
International ClassH04N 9/74 (20060101)
AbstractA system for producing video signals representative of video patterns having operator-selected video attributes is disclosed. A vertical bit memory includes a plurality of vertical entity memories, each vertical entity memory having a memory bit for each line of a video frame. A horizontal bit memory includes a plurality of horizontal entity memories, each horizontal entity memory having a memory bit for each elemental horizontal reference position of a video frame. A vertical address generator is used to access the vertical entity memories in parallel. A horizontal address generator is used to access the horizontal entity memories in parallel. Means are provided for entering in the horizontal entity memories and vertical entity memories, respectively, binary indications of operator-selected horizontal and vertical coordinates defining diagonally opposite corners of operator-selected video patterns for one or more operator-selected entities. A plurality of vertical and horizontal start/stop detectors are provided. Coincidence detectors are provided, one for each entity, each generating an output for its respective entity as a function of coincident outputs from the vertical and horizontal start/stop detectors for the entity. A priority encoder is responsive to the outputs of the coincidence detectors for generating an output designating the highest priority entity that is on at a given time. An entity attribute look-up memory is responsive to the output of the priority encoder to generate output video-representative signals having attributes that were previously stored in said attribute look-up memory.