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Explain the concept of modulation and its need in long distance communication. What is the difference between amplitude modulation and frequency modulation?
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Raveena Khanwalkar, studied at Electronics and Communication Engineering
Answered Jan 3, 2018
The basic concept of modulation is that the message signal in its original form cannot be transmitted through the channel as it will get distorted therefore we superimpose our message signal over a carrier having high frequency, energy and amplitude
There are two types of modulation
Frequency modulation
Amplitude modulation
Modulation is used in wireless communication such as
Wifi
Mobile communication
AMPLITUDE MODULATION
When instantaneous amplitude of the carrier varies with respect to instantaneous amplitude the message signal and frequency remains uneffected.
FREQUENCY MODULATION
When the instantaneous frequency of carrier signal varies with respect to instantaneous frequency message signal and amplitude remains constant.
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Al Klein, 46 years of earning a living developing systems - retired
Answered Aug 22, 2015
Modulation is needed for communicvation, whether it's 50 feet or 50,000 miles. A single carrier frequency conveys only 1 piece of information - that it's there (And its level and its frequency - which by themselves don't mean much.) Modulation is the act of adding data of some sort (voice, digital data, etc.) to that carrier. Even morse code - just turning the signal on and off at specific intervals - is modulation (for convention it's called amplitude modulation, although the only amplitudes are on and off, so it might as well be called digital modulation) and, as such, requires bandwidth.
The difference is that with amplitude modulation, it's the amplitude (level) of the sidebands that's variying with the information being carried. With frequency modulation it's the frequency of the sidebands that's varying.
(It's not the level of the carrier that varies with amplitude modulation. There was an article in the April issue of a radio magazine that described a new method of "amplitude modulation" - by swinging the antenna back and forth at an audio rate, so as to change the amplitude of the signal at the receiving end. April? As in April first? As in "April Fool"? Varying the amplitude of the carrier itself, with no sidebands, wouldn't convey much information by demodulating it the way an AM signal is normally demodulated.)
Explain the concept of modulation and its need in long distance communication. What is the difference between amplitude modulation and frequency modulation?
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5 ANSWERS

Raveena Khanwalkar, studied at Electronics and Communication Engineering
Answered Jan 3, 2018
The basic concept of modulation is that the message signal in its original form cannot be transmitted through the channel as it will get distorted therefore we superimpose our message signal over a carrier having high frequency, energy and amplitude
There are two types of modulation
Frequency modulation
Amplitude modulation
Modulation is used in wireless communication such as
Wifi
Mobile communication
AMPLITUDE MODULATION
When instantaneous amplitude of the carrier varies with respect to instantaneous amplitude the message signal and frequency remains uneffected.
FREQUENCY MODULATION
When the instantaneous frequency of carrier signal varies with respect to instantaneous frequency message signal and amplitude remains constant.
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Al Klein, 46 years of earning a living developing systems - retired
Answered Aug 22, 2015
Modulation is needed for communicvation, whether it's 50 feet or 50,000 miles. A single carrier frequency conveys only 1 piece of information - that it's there (And its level and its frequency - which by themselves don't mean much.) Modulation is the act of adding data of some sort (voice, digital data, etc.) to that carrier. Even morse code - just turning the signal on and off at specific intervals - is modulation (for convention it's called amplitude modulation, although the only amplitudes are on and off, so it might as well be called digital modulation) and, as such, requires bandwidth.
The difference is that with amplitude modulation, it's the amplitude (level) of the sidebands that's variying with the information being carried. With frequency modulation it's the frequency of the sidebands that's varying.
(It's not the level of the carrier that varies with amplitude modulation. There was an article in the April issue of a radio magazine that described a new method of "amplitude modulation" - by swinging the antenna back and forth at an audio rate, so as to change the amplitude of the signal at the receiving end. April? As in April first? As in "April Fool"? Varying the amplitude of the carrier itself, with no sidebands, wouldn't convey much information by demodulating it the way an AM signal is normally demodulated.)
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