Phase Modulation PM (Definition, Basics, Formula, Waveforms & Modulator) Explained
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- čas přidán 1. 07. 2018
- In this video, i have explained Phase Modulation (FM) by following outlines:
1. Phase Modulation (FM)
2. Phase Modulation basics
3. Phase Modulation Definition
4. Phase Modulation Formula
5. PM Modulator
6. Waveforms of Phase Modulation PM
Chapter-wise detailed Syllabus of the Analog Communication Course is as follows:
Chapter-1 Introduction to Analog Communication system: • Introduction to Analog...
Communication System block diagram, Classification of Communication system, Advantages of Frequency domain analysis over time domain analysis, Necessity of Modulation, Baseband signals and Passband signals, Classification of modulation techniques.
Chapter-2 Amplitude Modulation: • Amplitude Modulation, ...
Amplitude Modulation, Parameters of Amplitude Modulation, AM Modulator, AM Demodulator, AM Examples, Multitone Amplitude Modulation, DSBSC - Double Side Band Suppressed carrier, DSBSC Modulator, DSBSC Demodulator, Examples on DSBSC, SSBSC - Single Side Band Suppressed Carrier, SSBSC Modulator, SSBSC Demodulator, Examples on SSBSC, VSB - Vestigial Sideband, VSB Modulator, VSB Demodulation, VSB Filter Design, Comparison of DSBFC, DSBSC, SSBSC and VSB.
Chapter-3 Angle Modulation: • Angle Modulation, Freq...
Basics of Angle Modulation, Frequency Modulation, Phase Modulation, Frequency deviation & Modulation Index in FM, Spectral components of Angle Modulation, Bandwidth requirements in angle modulation, Average Power requirement for angle modulation, NBFM - Narrow Band Frequency Modulation, FM Generation, FM Demodulation, Examples on Angle modulation, Examples on Frequency modulation, Examples on phase modulation, Phase Lock Loop.
Chapter-4 Noise: • Noise in Analog commun...
Sources of noise in communication systems, Classifications of Noise in communication system, SNR - Signal to Noise Ratio, Noise Figure, Noise Temperature in communication system, Equivalent Noise figure and noise temperature, Examples on thermal noise, Examples on SNR & Noise Figure & Noise Temperature.
Chapter-5 Receiver: • Receiver in Analog Com...
Parameters of Receiver, Tuned Radio frequency receiver, Super Heterodyne receiver, Parameters of superheterodyne receiver, Selection of local oscillator frequency, Comparison of AM receiver and FM receiver, Examples on superheterodyne receiver.
Chapter-6 SNR of Analog Modulation: • SNR of Analog Modulati...
SNR of Baseband system, SNR of AM system, SNR of DSBSC system, SNR of SSBSC system.
Engineering Funda channel is all about Engineering and Technology. Here this video is a part of Analog Communication and Communication Engineering.
#PhaseModulation #AngleModulation #AnalogCommunication #EngineeringFundaation - Věda a technologie
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PM uses frequency modulator to combine the signals, while FM uses phase modulator to combine the signals. That helped me understand a lot. ty sir.
Thank u so much sir. I searched many videos for the explanation of PM wave. Nearly I have searched 10-12videos. But in this only i got the best explanation and simple too
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Only wanted to know how the PM wave is formed and he explained it perfectly. Great teaching:)
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sir as per the concept of pm when phase chanege is negetive the frequency ofpm wave increases.But in case of sqaure wave after the phase reversal when phase change becomes negetive 180 the picture shows the frequency of the pm wave does not changes.It should increase the frequency..sir i didnot understand ...please help me
In case of square wave, the frequency of PM wave remains unchanged. Reference: BP Lathi Example 5.2
Why is there no phase shift in sine wave just like the square wave?
Sir why don't u do phase reversal for sine wave it's also changing it's phase by 180° naa ?? Give me reply Sir Pardon
Great explanation...
Dear Sir thank you for a beautiful lecture. I have doubt that "How differentiation of frequency will be a phase?" (in Video 5:28). Another query is, in a square wave example we can clearly observe the change in phase and no change in frequency but in the example of the sinusoidal wave, we can observe the change in frequency as well. Please explain this.
sir is wrong
Very good explaining sir,I had many doubts about this topic ,but made all clear
Your positive comments motivates me. Thanks and welcome 🙏
I find the last example, modulating with a square wave, confusing. If the phase changes from +180 to -180 the actual change is 360. And that equals no change.
Sir why we use frequency modulator in phase modulation
The 2 PM plot, you done...is still the same expected output? One, u seem to compressed/expand And another is invert it to 180 degree
Sir its good if drawn carrier signal in between modulating signal and phase modulated wave to show differences in clear
What are the modulation circuit used in fm and pm???
Where is the frequency deviation maximum in PM signal for a sinusoidal modulating signal?
What would be the graph in case of impulse?
I loved the way you draw the graphs
Your positive comments motivates me, Thanks and welcome 🙏
how would pm look for a sawtooth wave
thank you sir
thanks sir.
And what are the benefits using PM instead FM if the only difference is when modulating low frequency on carrier the positive slope becomes spread (lower frequency carrier distortion) and on negative slope becomes denser compressed (higher frequency carrier distortion) and on FM is opposite?
I just know that with FM receiver you can listen both modulations FM and PM with no problem, but then why using PM?
There should be a separate video for the difference of am fm pm
Sir can u plz make video in c mos based multivibrator
why there is no phase change in case of sinusoidal while frequency change is there
Nice explanation tq so much sir
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Thanks you sir..we r very well understanding the concepts by your videos ...one thing that, after completion of this videos ..put that notes ,wt you explained in short method in this video ..it may help full for us ..after seeing this video ..
It means that .. keep a photo of that paper u r explained
The drawing for the phase modulated version of the sinusoidal modulating signal is wrong. The instantaneuos frequency changes in accordance with the derivative of the modulating signal. So, the frequency deviation is positive only when the slope of the message signal is positive.
This will be better understood if carrier wave is also plotted
Difference between frequency and phase modulation dono me phase badal raha h
Nice sir you are my favourite teacher ❤
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why cos used instead of sin in equation
Thank you Prof. Please suggest a reference book for the subject.
Sanjay Sharma
super sir
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THANK YOU SIRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
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What is theta
Why don't you write m(t) sir... It is always confusing....but a good lecture from u.!
Sir....! why haven't you drawn high and low frequencies at low and high amplitudes of the square wave? Will the frequency be constant?
Good question n
Have same doubt
sir please use same notation for modulating signal
it is more confusing
His handwriting is atrocious.
No sir idont think the frequency been changed in pm , from equation freqency is a constant
16:41 thanks
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love uguys
What if message signal doesn't aquire negative values ( means graph above the time axis ) then how we use phase modulation ? Because term [ Kp*m(t) ] will always be positive so no change in phase polarity .
P.S. may be a right explaination is slope of m(t) affect the phase.
+ve slope = Lead
-ve slope = lag
sir please teach on the board,because this is not comfortable and it takes more time to understand concepts.
Cos looking like ws
Why 180 degree?
when amplitude is +1 polar angle is +90deg and when amplitude is -1 polarange is -90deg so difference is 180
Sir as per the definition of phase modulation the phase of the carrier should change but while coming to the modulated wave it is looking similar to frequency modulated wave differentiate both practically and explain don't just dictate or else say
Practically not much difference but one can say it is differentiation phase to get PM and integration results into FM
here the main difference is that the variation in the signal in case of FM is due to sine waveform!
hence we get max and min value on corresponding max and min of msg signal as it is sine wave!!
now PM is varing with derivative of sine function i.e. cosine function!
so we get maxima and minima in PM at zero crossing of sin wave i.e . phase shifted max and min of cosine wave!!
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