COMBINED IMAGE PRODUCING APPARATUS

COMBINED IMAGE PRODUCING APPARATUS

A main video signal (1) is selectively replaced by a subvideo signal (11) when the subvideo signal is larger than a first predetermined value (REF1). During periods when the subvideo signal, typically its luminance signal, is larger than a third predetermined value (REF3), the subvideo signal is cla...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: CHIBA, YOSHIHARU
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:A main video signal (1) is selectively replaced by a subvideo signal (11) when the subvideo signal is larger than a first predetermined value (REF1). During periods when the subvideo signal, typically its luminance signal, is larger than a third predetermined value (REF3), the subvideo signal is clamped at a second predetermined value (REF2) that is smaller than the third predetermined value (REF3) when line non-correlation or field non-correlation is detected in the subvideo signal. This prevents noise pulses (B) of high level to be mixed into the main video signal, if their amplitude is larger than the predetermined value REF1.