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प्रश्न
Define the term modulation. Draw a block diagram of a simple modulator for obtaining AM signal ?
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उत्तर
Modulation is the process in which low frequency message signal is superimposed on high frequency carrier wave so that they can be transmitted over long distances.
The block diagram for a simple modulator for obtaining AM signal is shown below:
संबंधित प्रश्न
The process of superimposing a low frequency signal on a high frequency wave is_______ .
Define modulation and transducer
Define modulation index.
Draw a sketch of a sinusoidal carrier wave along with a modulating signal and show how these are superimposed to obtain the resultant amplitude modulated wave
A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?
Due to economic reasons, only the upper sideband of an AM wave is transmitted, but at the receiving station, there is a facility for generating the carrier. Show that if a device is available which can multiply two signals, then it is possible to recover the modulating signal at the receiver station.
Why is Modulation index kept low?
In the block diagram of a simple modulator for obtaining an AM signal, shown in the figure, identify the boxes A and B. Write their function.
A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation. The frequencies of the sidebands will be ______.
A transmitting antenna has a height of 320 m and that of receiving antenna is 2000 m. The maximum distance between them for satisfactory communication in line of sight mode is 'd'. The value of 'd' is ______ km.
