Analog modulation
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This document discusses different types of analog modulation techniques used in communication systems. It defines key concepts like signals, carriers, modulation and demodulation. There are three main types of analog modulation covered - amplitude modulation, frequency modulation, and phase modulation. Each works by varying a different property of the carrier signal (amplitude, frequency, or phase respectively) according to the information-bearing signal.
Analog modulation
- 2. Introduction I. Signals II. Carrier Modulation and Demodulation Types of analog modulation technique I. Amplitude modulation II. Frequency modulation III. Phase modulation
- 3. Signals :- Signal is defined as the useful information which is sanded by the transmitter and received by the receiver. Carrier:- Carrier is defined as a very high frequency signal over which information is mounted and sanded through the channel or medium.
- 4. Modulation:- Modulation is defined as the process or phenomenon by which the signal is mounted over the carrier signal and the signal so obtained is called as modulated signal. Demodulation:- Demodulation is defined as extracting the original signal from the received modulated signal. Modulation Demodulation
- 6. Amplitude modulation (A.M.):- In Amplitude modulation the carrier amplitude is changed according to the signal. Frequency modulation (F.M.):- In Frequency modulation the carrier frequency is changed according to the signal. Amplitude Time
- 7. Phase modulation (P.M.):- In Phase modulation the carrier phase is changed according to the signal. In positive amplitude the carrier phase is same and in negative amplitude the carrier phase is reversed to is original phase . Amplitude Time