Bro... You are doing social service (I don't think is there any better social service than giving free education/Knowledge). Now I am thinking if there is at least one teacher in my studies like you, I could have been in better position than at present. I just can't say thanks because Thanks is a very small word for the help which you are doing.
Good explanation, as information I got from the content of this channel that I used to build my communication device,which I made and uploaded the DIY in my channel
Thankyou for your help sir, Sir if possible please can you give the classes on aptitude sir . Or please suggest the good aptitude classes chanel which are in eng. Thankyou
That's what I am going to do. But I feel some basics of Fourier Series and Fourier Transform is important to understand the modulation. So, I am covering basics of Fourier Series and Fourier Transform first. Just couple of videos on that, and then will cover the main topics of communication.
In the analog communication, the signal which we are transmitting is in the analog form. In the digital communication, the signal is in the form of 1s and 0s.
I really want to know that in transmission section we do modulation and we turn the signal into modulating signal but again y we will demodulate in receiver section and why we will amplify it again plz answer this question
At the receiver end, to recover our message signal back, we used to demodulate the received signal. Also during the transmission, the signal will get attenuated. So, after the demodulation, once again the signal is amplified. For more information, please check the video on modulation. Your doubts will get clear. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-mHvV_Tv8HDQ.html
For digital transmitting the data, analog signal is first converted to digital form using ADC, and on the receiver using DAC, it is converted into analog form .For example, in the voice call that we are doing now a days, the typical analog speech signal is first converted into digital signal using ADC and then it is modulated and transmitted and at the receiver after demodulation, using DAC it is converted into analog signal once again.
The analog to digital conversion is required when the message is transmitted in the digital form. The digital signal has some advantages like noise immunity and it is possible to implement the error correction mechanism. (will talk about it in the future videos) So, when the message needs to be transmitted in the digital form, then using the analog to digital converter it is converted into the digital form, and at the receiver, to retrieve the original message (e.g voice signal), the digital signal is converted into the analog signal using the D/A converter. I hope it will clear your doubt.
To convert the analog signal into digital domain. First we need to sample the signal at specific interval and then sampled value is converted into specific code using ADC. I hope it will clear your doubt.
