What is Modulation - Need and Benefits of Modulation - Why Modulation is Required (Necessary)

This video explains what is modulation and what are the Needs and benefits of modulation in detail. Before understanding the need and benefits of modulation, it is important to know what is modulation? Modulation is a process by which some characteristic (amplitude/frequency/phase) of a high frequency carrier wave is varied, in accordance with the instantaneous value of the message signal (modulating signal/ baseband signal). Now let's write down the benefits of modulation. We will discuss each point in detail one by one- #To remove interference problem #Practical height of the antenna #Possibility of multiplexing #Long distance communication #Improved signal quality at the receiver 1.To Remove Interference Problem Modulation helps in removing the interference problem by allocating a separate frequency band to different signal transmissions. Because of this it becomes possible for many stations to transmit their message signals simultaneously without any interference. Ex. The transmission range for audio signals is 20Hz-20kHz. 2.Practical Height of The Antenna The height of antenna used for transmission and reception of the signal also depends on the process of modulation. The transmitting and receiving Antennas must have lengths, comparable to a quarter wavelength (λ/4) of the frequency used for transmission. To understand how the frequency used for transmission of the signal affects the height of the antenna. As mentioned earlier, height of the antenna should be comparable to λ/4 of the frequency used for transmission. height of the antenna= λ/4 Since we know that- c=λ.f here c is speed of light in vacuum= 3×10^8 m/s f is frequency Therefore λ= c/f So height of the antenna would be- (c/f).(1/4) here c and 1/4 are constants Therefore antenna height is inversely proportional to frequency used for transmission. It means as the frequency of modulation increases, height of the antenna used for transmission decreases. We Will understand it will the help of an example- Here we will see, how the height of the antenna reduced when we increased the frequency used for transmission from 4kHz to 5MHz after modulation. Height= λ/4 =(c/f).(1/4) = (3×10^8 m/s)/(4×10^3Hz)× (1/4) =0.187×10^5 meters = 18.7 kilometers !!! This height of antenna is not practical. After modulation- Frequency used is 5MHz H=(c/f).(1/4) =(3×10^8 m/s)/(5×10^6Hz)× (1/4) =0.15×10^2 meters 15meters It is practical height of the antenna. 3.Possibility of Multiplexing Multiplexing can be Defined as a process by which two or more signals can be transmitted simultaneously over the same channel for communication. Modulation can be used to allocate separate frequency bands by using career waves of different frequencies. This type of multiplexing is known as Frequency division multiplexing (FDM). 4.Long Distance Communication Modulation is used for long distance communication. In modulation we use high frequency carrier wave for transmission of the message signal. High frequency signals attenuate less as compared to low frequency signals. Therefore moderation is beneficial for long distance communication. 5.Improved Signal Quality At The Receiver Some techniques of modulation like Frequency Modulation (FM), Pulse Code Modulation (PCM) have the capability to improve quality of the signal received at the receiving end. So it helps in reducing the noise level in the signal, which is a big advantage of modulation. Visit My blog for more information https://www.engineeringmadeeasypro.com/ Please Support me on Patreon https://www.patreon.com/user?u=20310205 Like my Facebook Page https://www.facebook.com/lalitvas/?ref=aymt_homepage_panel Join my Facebook Group https://www.facebook.com/groups/1865786296998316/ PLAYLISTS on different Topics (Choose from the Large Collection of Videos) Electronics and Communication (ECE) Lecture Videos (GATE and IES) /playlist/PLDp9Jik5WjRtkw7q3aaVvMtLJiiw62V-H Communication Systems (Analog and Digital ) /playlist/PLDp9Jik5WjRuUyDT6961r8pkelgJMG8fG Modulation (Analog and Digital) /playlist/PLDp9Jik5WjRsXMtMxv80RTi-9Kvvo4Uvu Continuous Wave Modulation (AM, FM and PM) /playlist/PLDp9Jik5WjRtjhcs_NJrhydaQ8H5zSWPw Amplitude Modulation (AM Modulation) /playlist/PLDp9Jik5WjRs9kfzp-jqV9O5UGfDXAfUc Pulse Modulation Techniques (PAM, PWM, PPM and PCM) /playlist/PLDp9Jik5WjRvjqQ6ruRFC6hZcxnOsp3BE Digital Modulation Techniques Lectures [HD] /playlist/PLDp9Jik5WjRs5ismlsqP_Q3JNlWOe-2an Analog Communication Videos /playlist/PLDp9Jik5WjRu3rNvhqGjqgInU8zF6jE9s Analog and Digital Communication /playlist/PLDp9Jik5WjRsLppnN81bheIwGB8Hsx_Xa #modulation #modulationTechniques

Category