Analog to analog conversion
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The document discusses analog-to-analog conversion, also known as modulation, which is used for transmitting analog signals through a bandpass filter. It outlines three methods of modulation: amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). Each modulation type alters a carrier wave's characteristics based on the input signal's intensity or frequency.
Analog to analog conversion
- 1. Presentation topic Analog to analog conversion 3/12/2020 1
- 2. Analog Signal Analog signals are modified to represent analog data. Analog-to-analog conversion also called modulation. Modulation is generally needed when a bandpass channel is required. Bandpass is a range of frequencies which are transmitted through a bandpass filter. 3/12/2020 2
- 3. Analog to Analog conversion Analog to Analog conversion can be done in three ways: 1. Amplitude Modulation 2. Frequency Modulation 3. Phase Modulation 3/12/2020 3
- 4. AMPLITUDE MODULATION Process of changing the amplitude of high frequency carrier wave in accordance with intensity of signal is called AM. 3/12/2020 4
- 5. AMPLITUDE MODULATION Band width of AM signal = twice the bandwidth of modulating signal. B AM = 2 B If the modulation signal frequency increases, the amplitude of the carrier changes at a greater rate. 3/12/2020 5
- 6. FREQUENCY MODULATION Frequency modulation (FM), variation of the frequency of a carrier wave in accordance with the characteristics of a signal. 3/12/2020 6
- 7. PHASE MODULATION The modulation in which the phase of the carrier wave is varied according to the instantaneous amplitude of the modulating signal keeping amplitude and frequency as constant. 3/12/2020 7