Thank you! I am studying for my UK Amateur Radio Full license exam and I have been finding FM a bit difficult to understand. I don't need to learn as much detail as you offer here, but it has helped me a lot to spend more time with the basic idea. I have just seen that you also have another video on Frequency Deviation and Modulation Index, so I will go watch that next. Again, thank you for taking the time and effort to make your videos.
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In case of rectangular pulse you said that frequency deviation will be constant, but the deviation is proportional to area of x(t), so the deviation should linearly increase, similarly you said that in sine case deviation will be max at peak, but again area increases in first half, so freq should keep on increasing and then decrease and come back to normal after one full cycle. Isn't?
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Your positive comments motivates me. Teachers like me just wants positive comment from student. Love from you guys means a lot to me. My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.
Your positive comments motivates me. Teachers like me just wants positive comment from student. Love from you guys means a lot to me. My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.
When you teach in whiteboard, it's much much much better. that way i can take screenshot of whatever you wrote at end and that is like short note for entire video which is very helpful in revising.
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Yeah the explanation is fine but i have a doubt that as fc should be varying wrt m(t) but u have changed the phase as equals to kf*integral(m(t?)) . Y?
Hi, sir, thank you for the great video. I have some confusion about the frequency of the FM wave. In the last part, should Δf change linearly rather than stay constant? Since Δf represents the area enclose under the square wave, and such area varies with time linearly.
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In case of PULSE wave if we are taking time integral then the next negative half should gradually reduce the integral to zero right? Then why we are just taking it as negative. Please reply
Hello sir, I have exam tomorrow for Principle of Communication Engg. What questions should I do pls guide me. Should I solve B.P.lathi questions at this moment? I have today's night and tomorrow's morning only
@ 9:20 you wrote "derivation" below the integration sign. Did you mean to write integration instead? That doesn't make sense? Also when you say the max frequency occurs at the top of the sinusoid represented by m(t), that doesn't make sense with regards to the formula since the formula is integration and the max value for the integral value of m(t) occurs at T/2 and then it starts to decrease as we add negative area from m(t) and thus at the end of m(t) the integral the area of m(t) should be zero, correct?
Amazing series sir! I have a question regarding the block diagramm 6:50 .Is K_f (freq sensitivity) being introduced at the integrator or is it being introduced at the Phase modulator? And also can we regard the phase modulator as an adder of phases (angles)? Thank you so much for providing us with your knowledge!
Sir ,jo apne 5:13 me x(t) likha hai (vah eqn kisi bhi signal ko frequency modulate kerne ke liye hai kya ) Jaise x(t) ke place per sine wave , cosine wave ya square wave me se kuch bhi aa sakta hai n. Am I right ?
There is no channel to draw and explain circuit diagram of modulation can u pls do that....bcoz in interviews they r expecting to draw circuits more than block diagrams
The frequency is in terms of integration of m(t) over time, so even if m(t) is constant (as in case of square wave input, in 14th minute) the frequency increases linearly. so as you move further the frequency keeps increasing. But while drawing waveforms who have simply taken fm=fc+delta(f) and fm=fc-delta(f) i.e. constant, for positive and negative inputs respectively. Isn't something wrong here?
Also one more question sir! At 11:10 your graph implies that when the frequency of FM wave increases due to the positive portion of the above modulating signal (time interval when x(t) >0) it stays at a constant high frequency . Is that true? My intuition tells me (due to integration) that the frequency should keep on increasing gradually at higher rate till we reach time t_max where amplitude of x(t) is maximum and then gradually the rate of increment should decrease till we reach the zero crosing of the x(t).. Again for the negative portion of x(t) the frequency should keep on decreasing at gradually higher rate till time t_min where amplitude of x(t) is minimum and then the rate of decrement should be gradually lower till we reach the second zero crossing of x(t) Could you please clarify? Thank you!
See, if Amplitude is positively increasing then frequency will increase and if Amplitude is negatively increasing then frequency will decrease with respect to carrier frequency
Thank you, I think we can shall may vphv understand the importance value and truth of frequency wavelength and difference between wave and particle nature with speed of particles and at any cost understand the negative wave nature in eating non vegetarian or having sexual abuse or sexual intercourse and prevent them at any cost by maintaining proper speed pitch and frequency in ourself nerves neurons or connections in around us in the environment........
Their is a confusion x(t) and m(t). Topic is not clearly understandable. if you explain it with some block diagram then the formula based explanation is easily understandable.
