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Question

# ................. is the process of changing the characteristics of an analog signal based on the information on a digital signal.

A
Digital to analog modulation
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B
Analog to digital modulation
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C
Digital to digital modulation
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D
Analog to analog modulation
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Solution

## The correct option is A Digital to analog modulationDigital to analog modulation is the process of changing the characteristics of an analog signal based on the information on a digital signal. Digital-to-analog conversion is the process of changing one of the characteristics of an analog signal based on the information in digital data. Digital data needs to be carried on an analog signal. A carrier signal (frequency fc) performs the function of transporting the digital data in an analog waveform. Digital modulation methods. In digital modulation, an analog carrier signal is modulated by a discrete signal. Digital modulation methods can be considered as digital-to-analog conversion and the corresponding demodulation or detection as analog-to-digital conversion. Common analog modulation techniques are: Amplitude modulation (AM) (here the amplitude of the carrier signal is varied in accordance with the instantaneous amplitude of the modulating signal) Double-sideband modulation (DSB) Double-sideband modulation with carrier (DSB-WC) (used on the AM radio broadcasting band). Viewed from afar, the wave function below may seem smooth and analog, but when you look closely there are tiny discrete steps as the signal tries to approximate values: That's the big difference between analog and digital waves. Analog waves are smooth and continuous, digital waves are stepping, square, and discrete.

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