Differentiate between positive modulation and negative modulation.

Differentiate between positive modulation and negative modulation.
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1 Answer

Answer :

Positive Modulation
Negative Modulation
When increase in brightness of that picture results in an increase of the amplitude of modulated envelope.it is called positive modulation.
When increase in brightness reduces amplitude of the modulated envelope, it is called negative modulation.
White level of video signal corresponds to 100% total magnitude.
White level of video signal correspondence to 12.5% of the total amplitude
Noise pulses do not affect synchronization but cause white spot in the picture
Noise pulses are seen as less annoying black spot.
More power is required with less efficiency
If peak power available from transmitter is considered them less power is required for more efficiency.
Black level of video signal correspondence to 25% of total magnitude.
Blanking level starts at 75%
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Waveform of positive modulation
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Waveform of Negative modulation 
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