Introduction to Video Modulation:
There are two kinds in Video modulation:
1. Positive Modulation
2. Negative Modulation
POSITIVE MODULATION
While the intensity of picture brightness results increase in Amplitude of the modulated envelope, it is termed as Positive modulation.
NEGATIVE MODULATION
While the polarity of modulating video signal is so selected that sync tips lie at the 100% level of carrier amplitude and increasing brightness, generates reduce in the modulation envelope, it is termed as Negative modulation.
ADVANTAGES OF NEGATIVE MODULATION
In this, because of noise black dots are created with black back ground. This will comprise minimum influence than the white dots with white background in positive modulation.
DISADVANTAGE
Impulsive interference might occur while there is change in signal strength.
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