NJM2207S データシートの表示（PDF） - Japan Radio Corporation

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NJM2207S

Video super imposer

Japan Radio Corporation  

NJM2207

■ PRINCIPEL OF CHARACTER SUPERIMPOSER

Basic principle is shown at Fig.1.

Usual TV has video (composite) signal output and input terminals to connect VCR or others. There is all information

about picture on video composite signal (Ref. to Fig. 2). Its time signal of horizontal and vertical synchronous signal

indicates the brighten place of TV tube. For brightening TV tube regardless video signal, the video input signal has to be

switched to DC level (luminance level) on that scanning time. On this method, character is shown with background of

usual picture.

Fig.1 Principle of Character Superimposer

Fig.2 Composite Video Signal

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Ver.2006-02-17

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