Why we Need Modulation Explained: Smaller Devices, Simultaneous Transmission, Less Interference.

Analog & Digital Modulation playlist. Watch these video to understand more on Analog & Digital Modulation. https://www.youtube.com/watch?v=8BniBC4fuWY&list=PLFxhgwM1F4yzpIC7NeH9oMlc2DDdgww3m For access to this presentation materials, membership is required: I need the Material PPT Sent me an email to [email protected] If you need the whole playlist material, send me email and we discuss. Give me some time to response. Thanks. Modulation Part 1. Define Modulation & Why Modulation is ESSENTIAL in Electronics Communication – Explained Simply! Modulation #1. Why Amplitude, Freq & Phase Modulation Are ESSENTIAL for Wireless Communication. Why Modulation Matters: Key to the Backbone of Electronics Communication Systems. Why Modulation is Essential: The Core of Electronics Communication System. How Modulation Works: The Backbone of Wireless & Electronics Communication! How Modulation Works: The Secret Behind Wireless & Electronics Communication. What is communication? Transfer of information between two or more points: sender (transmitter) recipient (receiver) How is communication being carried out? Simplest form: f2f Long distance communication In the past: Use smoke signals, fires, drum beats, waving coloured flags, pigeons In modern times: Information transfer is done electronically A communication system is a set of devices and protocols that work together to transmit information from one place to another. These systems are integral to modern life, enabling the exchange of data, voice, video, and other forms of information across distances. Transmitter is a collection of electronic devices or circuits that converts the original source information - also called as baseband signal - to a form suitable for transmission. The channel is the medium by which the electronic signal is sent or propagated from one place to another. It provides a means of transporting signals between transmitter and receiver. The receiver is a collection of electronic devices and circuits that accepts the transmitted signals from the transmission medium and then converts those signals back to their original form which is understandable by humans. The medium by which the electronic signal is sent from one place to another. Transmission line - a pair of wires that carry the information in the form of an electrical current Optical fiber - a fine piece of glass that carries the information in the form of light signals Wireless - the medium is the air itself, for example radio Modulation is the process of using the information signal (data) to modify one of the characteristics (Amplitude, Frequency or Phase) of a higher frequency signal before transmission. The information signal is known as the 1) Baseband 2) Intelligent 3) Modulating signal and is usually denoted by em(t). The higher frequency signal helps to ‘carry’ the information signal and hence is known as the carrier signal, ec(t). The ‘modified’ carrier after the process of modulation is called the modulated carrier. Amplitude Modulation (AM): The amplitude of the carrier wave is varied in proportion to the information signal. Frequency Modulation (FM): The frequency of the carrier wave is varied based on the information signal. Phase Modulation (PM): The phase of the carrier wave is changed in accordance with the information signal. Direct transmission of baseband signal like voice, TV signals, etc, without using modulation is undesirable because: 1) Large Antenna Required for Low Frequency Baseband Signal The physical dimension of the antenna is directly proportional to the wavelength of the signal. Large antenna is not practical because of the high cost involved for such an antenna and the difficulty of installing and maintaining it. 2) Simultaneous Transmission of Baseband Signal Cause Interference If there are more than one baseband transmissions through the transmission medium at any one time, then all information will interfere with each other. Example: Imagine if all the radio stations were to simultaneously transmit their deejay’s voice without going through any sort of modulation process. These voices, being almost of the same frequency, would then interfere with each other and makes listening impossible. 3) Noise and Interference. Improved Signal Quality Low-frequency baseband signals are more susceptible to noise and interference due to their proximity to noise sources. Many natural and man-made noise sources, such as electrical appliances, power lines and atmospheric disturbances, produce significant low-frequency components. These components overlap with the frequency range of baseband signals, increasing their vulnerability to interference.