FRAME SIGNAL INSERT CIRCUIT

PURPOSE:To make a level of an inserted frame signal stable independently of the level of a video signal by inserting the frame signal from a frame signal level setting means to a video signal whose DC level is recovered by a DC level recovery means. CONSTITUTION:A video signal outputted from a video...

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Bibliographic Details
Main Authors HIRAHATA SHIGERU, TORIGOE SHINOBU, KATSUMATA KENJI, KONNO MITSUHISA, MATSUURA SHIGEO
Format Patent
LanguageEnglish
Published 13.02.1992
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:PURPOSE:To make a level of an inserted frame signal stable independently of the level of a video signal by inserting the frame signal from a frame signal level setting means to a video signal whose DC level is recovered by a DC level recovery means. CONSTITUTION:A video signal outputted from a video signal processing means 103 is clamped by a DC level recovery means 106 to recover a DC level. Then a frame signal from a frame signal level setting means 107 through a frame signal insert means 108 is inserted to the video signal whose DC level is recovered by the DC level recovery means 106. Thus, the frame signal is inserted to the video signal after the DC level is recovered. Thus, the DC level of the frame signal is not fluctuated with respect to a reference level of the video signal, the stable frame signal is obtained.
Bibliography:Application Number: JP19900148766