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Ask iit jee aieee pet cbse icse state board experts Expert Question: when you want to take a film from tv screen by mobile phone u see noise bands on film why?
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saeed (0)

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when you want to take a film from tv screen by mobile phone you see noise bands on film why?
    
eistien (343)

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both the equipments we are speaking of consists of circuits inside withe the cell working on wireless communication which is based on tracking of resonant frequency as we pass by the tv with our cell phone the cell phone which detects waves matching the resonant frequency show high electric and magnetic field amplitude which affects the transmission of signals accross the cables nearby which causes distortion !!! suresan sir am i rite!!! comment on this sir!!! rate me if useful!!!!
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edison (4384)

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This is due to the slow refresh rate (25 Hz) of our TV screens, as u know for illusion of motion to our eyes it needs a refresh rate of atleast 25 Hz.

Now when u take a video of the TV screen the camcoder also has a similarly low refresh rate. Since while taking the picture the refreshing of the Tv and the camcoder are occuring differently at different times, we observe the flicker.

The most incomprehensible thing about the world is that it is

at all comprehensible.
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