Overlay appts. for superposition of digital TV pictures from video recorder - performs multiplication by progressively varying factors of input and retrieved signals for addn. to overlay limitation unit

摘要

The super position process is governed by a controller (10) incorporating a remote control unit (11) for selection of normal or overlay mode and a device (12) producing an input video multiplication factor (A) which gradually increases, and a feedback video multiplication factor (B) which gradually decreases. The video input is multiplied (21) by the increasing factor, and feedback (D) from the single frame memory (41) by the decreasing factor for addn. (23) to the prod. (22) thus obtd. USE/ADVANTAGE - In a video recorder, a chosen special video image can be stored and retrieved easily for display in accordance with the user's wishes.