Modulation is the process of varying one or more properties of a carrier signal with a modulating signal. Modulation is the process of encoding information into a carrier signal for transmission
- 2. Introduction to Modulation • Modulation is the process of varying one or more properties of a carrier signal with a modulating signal. • Modulation is the process of encoding information into a carrier signal for transmission Purpose: Enables transmission of signals over long distances. Basic elements: Carrier signal, Modulating signal, Modulated signal.
- 4. Need for Modulation • Reduces antenna size • Increases communication range • Allows multiplexing of signals • Improves signal quality and reduces noise
- 5. •Types of Modulation 1. Analog Modulation • Uses continuous signals • Analog modulation is a technique where an analog signal (like audio or video) is superimposed on a carrier wave to transmit information over a long distance Types: • - Amplitude Modulation (AM) • - Frequency Modulation (FM) • - Phase Modulation (PM)
- 6. •Amplitude Modulation (AM) • Varies amplitude of carrier signal • Used in AM radio broadcasting • Simple circuitry, lower cost • Amplitude Modulation (AM) is a technique where the amplitude of a high-frequency carrier wave is varied in accordance with the amplitude of a modulating signal, such as an audio or video signal.
- 7. • Frequency Modulation (FM) • Varies frequency of carrier signal • Used in FM radio, audio broadcasting • Better noise immunity than AM • Frequency Modulation (FM) is a technique where information is encoded on a carrier wave by varying the frequency of the wave in proportion to the modulating signal
- 8. • Digital Modulation • Uses discrete signals (0s and 1s) • Digital modulation is a process where digital information, like binary data, is encoded onto an analog carrier signal for transmission Types: • - Amplitude Shift Keying (ASK) • - Frequency Shift Keying (FSK) • - Phase Shift Keying (PSK) • - Quadrature Amplitude Modulation (QAM)
- 9. •Amplitude Shift Keying (ASK) • Transmits data by varying amplitude • Used in low-bandwidth applications • Simple but susceptible to noise
- 10. •Frequency Shift Keying (FSK) • Varies frequency to represent data • Used in modems, RFID • More robust than ASK
- 11. •Phase Shift Keying (PSK) • Changes phase of carrier to represent data • Common in wireless communication • Efficient use of bandwidth
- 12. •Applications of Modulation • Radio and TV broadcasting • Mobile communication • Satellite communication • Internet data transmission • Remote control systems
- 13. •Advantages and Importance • Efficient spectrum usage • Long-distance communication • Signal multiplexing • Improved data security • Enhanced signal quality
- 14. Conclusion Modulation is an indispensable tool for modern communication, enabling efficient, robust, and versatile transmission of data across various mediums and applications. • Modulation is essential for modern communication systems • Different types suit different needs • Enables global connectivity and digital innovation
- 15. THANKS