Image synthesizing circuit

Abstract

Abstract PURPOSE:To make image synthesis by using inexpensive VTRs with no external synchronization, by reading out and synthesizing three primary-color signals reproduced by the VTRs by using common readout clocks after the signals are once written in storing means. CONSTITUTION:Three primary-color and 1st composite synchronizing signals are fetched from NTSC signals reproduced by a VTR 24 by means of an NTSC signal/three primary-color signal converter 201 and synchronizing separator 202 and the former are supplied to a composition converter 23. On the other hand, three primary-color and 2nd composite synchronizing signals are similarly fetched from NTSC signals reproduced by another VTR 25 by means of another NTSC signal/three primary-color signal converter 203 and synchronizing separator 204 and the former are written in a three-face memory 212 by utilizing the 2nd composite synchronizing signals after they are respectively supplied to corresponding AD converters 211 and converted into digitized three primary-color signals. The digitized signals are read out at the timing of the 1st composite synchronizing signals and converted into three primary- color signals by a DA converter 221. After the conversion, three primary-color signals are individually synthesized by the composition converter 23 and further converted into NTSC signals.

Inventors

• 👤 Masakazu Yamaguchi
• 👤 山口　政数

Bibliographic Details