Multichannel display unit for television picture receiver

Abstract

Abstract 09 PURPOSE:To secure the superimpose of a picture of other channel and in an optional size irrespective of the synchronous difference between the main and other channels, by providing several groups of memories to store the other channel signals with every field and then giving a succesive write/read control to those groups with a delay of time each. CONSTITUTION:The signal of other channel is received by the tuner 3 and then applied to the A/D converter 12 vir the IF4. The display memories 13-16 read successively the signals of other channels based on the signal of main channel to form a montage screen. The control signal generating circuit 24 performs the memory reading and writing puls the address switching by the output of the synchronous difference detecting circuit 23 in order to write the secondary channel into the display memory which is not read out to the main channel. Thus the memory block is fractionated to realize a simultaneous reading of the same memory blocks as well as a montage of the screen with an optional size ratio.

Inventors

• 👤 Akira Matsushita

Bibliographic Details