logging in or signing up am modulation aSGuest131519 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 780 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: April 05, 2012 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript MODULATION: MODULATION BY- SANJAY KUMAR 0900321088 EN-2(A)introduction: introduction Modulation is the process by which some characteristics of a carrier is varied in accordance with a modulation wave . Modulation is the process of putting information onto a high frequency carrier for transmission (frequency translation). such a modification is achieved by mean of a process called modulation .PowerPoint Presentation: In the modulation process, the baseband signle is called “modulating signal” and anther higher frequency signal is called as the “carrier”. The carrier signal will carry the modulating signal to the destination.Different of Modulation Method : Different of Modulation Method Analog modulation - The modulating signal and carrier both are analogue signal. TYPES : Amplitude modulation (AM), Frequency modulation (FM), Phase modulation (PM)PowerPoint Presentation: Figure Types of analog- modulationDigital modulation - The modulating signal is a digital signal , but the carrier is an analogue signal. TYPES : Amplitude Shift Keying (ASK), Frequency Shift keying (FSK), Phase Shift Keying (PSK) : Digital modulation - The modulating signal is a digital signal , but the carrier is an analogue signal . TYPES : Amplitude Shift Keying (ASK), Frequency Shift keying (FSK), Phase Shift Keying (PSK)Amplitude Modulation: Amplitude Modulation Amplitude Modulation is a process of changing the amplitude of a high frequency carrier signal in proportion with the instantaneous value of modulating signal (information). Amplitude Modulation is the simplest and earliest form of transmitters.PowerPoint Presentation: Figure : Amplitude modulationAM – Basic Definitions: AM – Basic Definitions The AM signal: The modulating signal: The Carrier Signal:AM Characteristics : AM Characteristics AM is a nonlinear process Sum and difference frequencies are created that carry the informationmodulation index : modulation index The ratio between the amplitudes between the amplitudes of the modulating signal and carrier, expressed by the equation:Measurement of Modulation Index: Measurement of Modulation IndexOvermodulation: Overmodulation When the modulation index is greater than 1, overmodulation is presentModulation Index for Multiple Modulating Frequencies: Modulation Index for Multiple Modulating Frequencies Two or more sine waves of different, uncorrelated frequencies modulating a single carrier is calculated by the equation:Full-Carrier AM: Frequency Domain: Full-Carrier AM: Frequency Domain Time domain information can be obtained using an oscilloscope Frequency domain information can be calculated using Fourier methods, but trigonometric methods are simpler and valid Sidebands are calculated using the formulas at the rightBandwidth: Bandwidth Signal bandwidth is an important characteristic of any modulation scheme In general, a narrow bandwidth is desirable Bandwidth is calculated by: f C f c +f m f c -f m 2f mapplications Amplitude Modulation: applications Amplitude Modulation AM applications include broadcasting in medium- and high-frequency applications, CB radio , and aircraft communicationsTHANK YOU : THANK YOU You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.