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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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.
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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
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.
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.
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 ..
All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏
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?
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
Your Appreciations, care and share matters a lot to me. #EnginneringLove. All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏
Your Appreciations, care and share matters a lot to me. #EnginneringLove. All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏
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
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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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
Only wanted to know how the PM wave is formed and he explained it perfectly. Great teaching:)
Your positive comments motivates me, my goal is to create largest community of engineers in entire globe, so please help me for that by sharing this lecture series(playlist) with your friends in social media (watsapp, telegram etc). Thanks and welcome 🙏
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
Nice sir you are my favourite teacher ❤
Your Appreciations, care and share matters a lot to me. #EnginneringLove.
All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us.
Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏
Very good explaining sir,I had many doubts about this topic ,but made all clear
Your positive comments motivates me. Thanks and welcome 🙏
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
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
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.
I loved the way you draw the graphs
Your positive comments motivates me, Thanks and welcome 🙏
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
Why is there no phase shift in sine wave just like the square wave?
Why don't you write m(t) sir... It is always confusing....but a good lecture from u.!
Sir its good if drawn carrier signal in between modulating signal and phase modulated wave to show differences in clear
Nice explanation tq so much sir
Your positive comments motivates me, Thanks and welcome 🙏
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.
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
THANK YOU SIRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us.
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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?
Great explanation...
There should be a separate video for the difference of am fm pm
This will be better understood if carrier wave is also plotted
Thank you Prof. Please suggest a reference book for the subject.
Sanjay Sharma
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Sir why we use frequency modulator in phase modulation
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
super sir
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Where is the frequency deviation maximum in PM signal for a sinusoidal modulating signal?
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
What would be the graph in case of impulse?
No sir idont think the frequency been changed in pm , from equation freqency is a constant
What are the modulation circuit used in fm and pm???
Sir can u plz make video in c mos based multivibrator
sir please teach on the board,because this is not comfortable and it takes more time to understand concepts.
thank you sir
how would pm look for a sawtooth wave
sir please use same notation for modulating signal
it is more confusing
His handwriting is atrocious.
16:41 thanks
Your Appreciations, care and share matters a lot to me. #EnginneringLove.
All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us.
Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏
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!!
Difference between frequency and phase modulation dono me phase badal raha h
why cos used instead of sin in equation
thanks sir.
Why 180 degree?
when amplitude is +1 polar angle is +90deg and when amplitude is -1 polarange is -90deg so difference is 180
What is theta
Cos looking like ws
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Subtitle pls🙏
Please say in hindi.
why there is no phase change in case of sinusoidal while frequency change is there