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प्रश्न
What is meant by term ‘modulation’? Draw a block diagram of a simple modulator for obtaining an AM signal.
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उत्तर
The process of superimposing information contained in a low frequency signal on a high frequency signal is called modulation.
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संबंधित प्रश्न
How is amplitude modulation achieved?
Define the term 'amplitude modulation'
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.
Why is frequency modulation preferred over amplitude modulation for transmission of music?
Solve the following question.
A message signal of frequency 20 kHz and peak voltage 10 V is used to modulate a carrier of frequency 2 MHz and peak voltage of 15 V. Calculate the modulation index. Why the modulation index is generally kept less than one?
Define amplitude modulation in a communication system.
Identify the mathematical expression for amplitude modulated wave ______.
Compute the LC product of a tuned amplifier circuit required to generate a carrier wave of 1 MHz for amplitude modulation.
An amplitude modulated wave is as shown in figure. Calculate
- the percentage modulation
- peak carrier voltage and
- peak value of information voltage.
A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal are ______.
