Contents
How is AM signal generated?
AM generation involves mixing of a carrier and an information signal. In low level modulation, the message signal and carrier signal are modulated at low power levels and then amplified. The advantage of this technique is that a small audio amplifier is sufficient to amplify the message signal.
How does the bandwidth of an AM signal relate to the information signal?
In other words the bandwidth occupied by the AM signal is twice the maximum frequency of the signal that is used to modulated the carrier, i.e. it is twice the bandwidth of the audio signal to be carried.
What is the basic difference between an AM signal and a narrowband FM signal?
What is the basic difference between an AM signal and a narrowband FM signal? In the case of sinusoidal modulation, the basic difference between an AM signal and a narrowband FM signal is that the algebraic sign of the lower side frequency in the narrow band FM is reversed.
What are the three signals involved in the modulation process?
All three types of modulation AM, PM, and FM may be caused by the continuous (analog or impulse) and digital modulating signals.
What is the bandwidth of the modulated signal?
The bandwidth occupied by such a frequency-modulated wave is defined as the distance between the two frequencies beyond which none of the side frequencies is greater than 1 per cent of the carrier amplitude obtained when the modulation is removed.
What are the advantage of AM over FM signal?
The main advantages of FM over AM are: Improved signal to noise ratio (about 25dB) w.r.t. to man made interference. Smaller geographical interference between neighboring stations. Less radiated power.
How does modulation improve quality of reception?
The attenuation reduces with increase in frequency of the transmitted signal, and they travel longer distance . The modulation process increases the frequency of the signal to be transmitted . Therefore, it increases the range of communication.