Amplitude Modulation (AM) Explained
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Published 2020-07-21
An watching this video, you will learn the following topics:
0:00 Introduction to Amplitude Modulation (AM)
3:07 What is Envelope of the AM signal and brief intro to Envelope Detection
5:33 What is the Modulation Index?
11:54 Modulation Index for Tone Modulation
14:26 Frequency Spectrum of AM signal
16:52 Carrier Power and Sideband Power of AM signal
21:05 Transmission Efficiency of AM signal
Amplitude Modulation:
In Amplitude Modulation, the amplitude of the carrier signal changes according to the message signal.
Modulation Index:
The modulation index defines, to what extent the carrier signal gets modulated by the message signal.
For the asynchronous demodulation of the AM signal (using the envelope detection), the modulation index of the AM signal should be less than or equal to 1.
If the modulation index is greater than 1 (overmodulation), there will be distortion in the demodulated signal.
Frequency Spectrum of AM signal:
In this video, the frequency spectra of the AM signal is explained for the tone modulation as well as for the general message signal.
If the bandwidth of the message signal is B, then after the modulation, the required bandwidth will be 2B. (The Amplitude Modulation requires two times the bandwidth of the modulating signal)
Carrier and Sideband Power:
In Amplitude Modulation, a lot of transmitted power is wasted for transmitting the carrier signal. (Even though it does not carry any information)
For the tone modulation, the total transmitted power
Pt = Pc ( 1 + µ^2/2)
Where Pc - Carrier Power and µ - Modulation Index
Transmission Efficiency of AM signal:
For tone modulation,
Transmission Efficiency (%) = Useful power / Total power = µ^2 / ( 2 + µ^2)
Other Useful videos related to Communication:
1) What is Modulation? Types of Modulation
• What is Modulation ? Why Modulation i...
2) Introduction to Analog and Digital Communication
• Introduction to Analog and Digital Co...
This video will be useful to all students of science and engineering in understanding the Amplitude Modulation (AM).
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All Comments (21)
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Timestamps for the Different Topics covered in the video: 0:00 Introduction to Amplitude Modulation (AM) 3:07 What is Envelope of the AM signal and brief intro to Envelope Detection 5:33 What is the Modulation Index? 11:54 Modulation Index for Tone Modulation 14:26 Frequency Spectrum of AM signal 16:52 Carrier Power and Sideband Power of AM signal 21:05 Transmission Efficiency of AM signal
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No one can teach us like you. You have great explanation skills any person can understand the concept only when he watch your lecture videos. Thank you 🙏🙏❤
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Please turn on automatic translation feature. Your explanation is very nice. Some videos don't have subtitles. Even if we understand in general, there may be missing places, thanks to automatic translation, we can translate it to our own language and watch videos. Good work, thank you
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very good explanation! don't you skip a second or you'll miss some details
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pls make for the FM tho, your explanation was great and clear 🙏
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Please upload SSB, VSB concepts soon. I'm really into your channel's teaching and don't wanna change to any other teaching method or channel. So a huge request to upload these topics soon.
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Please upload video for inter symbol interference.. thank you sir.. you are explanation is very clear.
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Great work sir Thank you
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which software do u use to draw AM signals and in general, signals you usually present in the videos
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Please keep making these videos, sir💪🏻
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Excellent 👌 Very good 👍
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At 20.46, you say the sideband power is m^2(t)/ 2R. By my understanding, that is the general representation of V^2 rms/R. But where does the 2 in denominator come from ? If my understanding is wrong, please correct me. and, THANKU Soo much for these wonderful lectures. I'm totally loving Modulation now !
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Thank you so much
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why u skipped demodulation part for this amplitude modulation.
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Sir Is this communication series covers everything for a competitive exam?
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Best 👌🏻👌🏻👍🏻
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I hope you include the electronics that is used to achieve the modulation and demodulation in the discussion...
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Sir Which Topics of Electronics is reduced for 12th standard. Maharashtra Board. Sir if you make video on it , It is better for 12th Students
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Sir can you share your educational journey ?
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Oh jeesh, just wanted a simple explanation of this and now I need a masters degree to understand :-(
