Picture-in-picture television receivers.

摘要

In a picture-in-picture television receiver, the subpicture signal is A-D converted (8); the converted digital subpicture signal is latched (92) in response to a subpicture clock signal (fw) which is in synchronism with a subpicture synchronising signal; the latched signal is latched again (93) and stored in an image memory (10) in response to a main picture synchronising signal; and the latched signal is read from the image memory (10) in synchronism with the main picture synchronising signal, in order that the subpicture can stably be inserted in a predetermined area of the main picture by eliminating an unstable data duration or interval during which variation in the subpicture signal is different for each of a plurality of bits thereof.