Advertisements
Advertisements
प्रश्न
Why is a AM signal likely to be more noisy than a FM signal upon transmission through a channel?
उत्तर
In AM, the carrier wave's instantaneous voltage is varied by modulating wave voltage. On transmission, noise signals can also be added and the receiver assumes noise is a part of the modulating signal.
However, in FM, the carrier frequency is changed as per modulating wave's instantaneous voltage. This can only be done at the mixing/ modulating stage and not while the signal is transmitting in a channel. Hence, noise doesn’t effect the FM signal.
APPEARS IN
संबंधित प्रश्न
Explain any two factors that justify the need of modulating a low-frequency signal.
For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude is found to be 2 V. Determine the modulation index μ. What would be the value of μ if the minimum amplitude is zero volt?
How is amplitude modulation achieved?
Explain any two factors which justify the need for modulating a low frequency base-band signal.
Draw a schematic sketch showing how amplitude modulated signal is obtained by superposing a modulating signal over a sinusoidal carrier wave.
Write three important factors which justify the need of modulating a message signal. Show diagrammatically how an amplitude modulated wave is obtained when a modulating signal is superimposed on a carrier wave.
What is meant by term ‘modulation’? Draw a block diagram of a simple modulator for obtaining an AM signal.
In amplitude modulation ______.
The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V respectively. The percentage modulation index will be ______.
A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal are ______.
