Signal

Characterization of the amount of modulation in a signal

Characterization of the amount of modulation in a signal
  1. Which of the characteristics of a signal can be modified by modulation?
  2. How do you calculate modulating signals?
  3. What is the ideal percentage of modulation?

Which of the characteristics of a signal can be modified by modulation?

The parameters of the carrier that can be modified are the amplitude, the frequency, and the phase.

How do you calculate modulating signals?

The equation for the overall modulated signal is obtained by multiplying the carrier and the modulating signal together. The constant A is required as it represents the amplitude of the waveform. Note also that the sidebands are separated from the carrier by a frequency equal to that of the tone.

What is the ideal percentage of modulation?

The ideal condition for AM is when or , which gives 100 percent modulation. This results in the greatest output power at the transmitter and the greatest output voltage at the receiver, with no distortion. Preventing overmodulation is tricky.

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