Modulation is nothing charter of technology and singnal that various are messages
there are three types
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TYPES OF MODULATION :-
1)"Modulation is defined as the precess by which some characteristics, usually amplitude, frequency or phase, of a carrier is varied in accordance with instantaneous value of some other voltage, called the modulating voltage."
Frequency modulation is a change in the carrier frequency (fc) with all other factors remaining constant.
Phase modulation is a change in the carrier phase angle (θ ). The phase angle cannot change without also affecting a change in frequency. Therefore, phase modulation is in reality a second form of frequency modulation.
In the Pulse modulation, the continuous signal is converted into a series of pulses, each proportional to the amplitude of the signal and corresponding in time to it.
•According to the question, amessage signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage 400 V.
• So,Fm = 100MHz = 10^8 MHz
(Vm)o = 100V , ( Ve)o =400 V
So the modulation index = (Vm)o /( Ve)o
= 100/400 = 1/4 = 0.25
UBF or Upper Band Frequency = Fe + Fm
LBF or Lower Band Frequency= Fe – Fm
so,the difference between the two side band frequencies are [UBF — LBF] = 2Fm = 2× 10 ^8 Hz
So, the answer is (D) 0.25 ; 2 × 10⁸ Hz
in frequency modulation,frequency of message signal can be changed.
Modulation is the process of superimposing electrical audio signal on high frequency carrier wave.
it is of three types
1. Amplitude modulation
2. Frequency modulation
3. Phase modulation.
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Amplitude Modulation (AM): Amplitude of the carrier is modulated.
Frequency Modulation (FM): Frequency of the carrier is modulated.
Phase Modulation (PM): Phase of the carrier is modulated.
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The modulation is the process of varying the carrier wave (transmitting wave) with the modulating wave (information wave). The modulation is done to transmit the signal for longer distance. The device used to vary the information is called modulator.Types of modulation: Amplitude modulation Frequency modulation Phase modulation Polarization modulation Pulse-code modulation Quadrature amplitude modulation The meaning of Amplitude modulation:
In this modulation, the amplitude or intensity or height of the wave is varied to transfer the data.
motion of a direction in straight line is called linear motion
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