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What is positive and negative modulation?

in order to transmit the video signal amplitude modulation is used. the composite video signal has distinct polarity of black and white levels in the picture.1.positive modulation :- in this type of modulation, increase of brightness toward white causes increase in carrier amplitude peak white has 100% modulation while black and sync level have lower and minimum modulation respectively2.negative modulation :-in this type of modulation,the sync tip level are at 100%.blanking level correspond to black is at 75%and increase in brightness toward white causes decrease in carrier amplitudeNegative modulation is preferred over positive modulation because impulse interference is difficult to deal with and random increase in signal is similar to existing sync pulse.these interference result in generation of black spot and white blobs.


What does AM and FM stand for in radios?

AM - Amplitude Modulation FM - Frequency Modulation


Need for modulation?

modulation


What are the two types of angle modulation?

Frequency Modulation and Phase Modulation


When modulation frequency is double the modulation index is halF and the modulating voltage remains constant the modulation system is?

frequency modulation..


How velocity modulation and density modulation related to each other?

due to velocity modulation density modulation occurs in TWT


What is the difference between frequency modulation and phase modulation?

The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.


When modulation frequency is doubled modulation index also doubled in case of FM or pm or am?

In Frequency Modulation (FM), if the modulation frequency is doubled, the modulation index does not necessarily double; it depends on the amplitude of the modulating signal. In Amplitude Modulation (AM), the modulation index is defined as the ratio of the peak amplitude of the modulating signal to the carrier amplitude, so it remains unchanged with varying modulation frequency. For Phase Modulation (PM), similar to FM, the modulation index is influenced by the amplitude of the modulating signal and does not inherently double with the modulation frequency. Thus, modulation frequency and modulation index are not directly linked in this way for FM, PM, or AM.


When modulation frequency is doubled the modulation index is halved and the modulating voltage remains constant the modulation system is?

the modulation system is of FM


Why frequency modulation and phase modulation are called angle modulation?

i dont know ans. of this.


How does quadrature amplitude modulation works?

QAM is a combination of phase modulation & amplitude modulation.


In which Analog to analog modulation methods does the peak amplitude?

Frequency modulation Phase modulation