Modulation

Modulation involves altering aspects of a periodic phenomenon, such as frequency, amplitude, or phase of a waveform. In FM radio, the frequency of the radio signal is modulated to carry audio signals.

What is the general concept of modulation?

• Changing the color of a signal

• Decreasing the volume of a signal

• Altering some aspect of a periodic phenomenon

• Increasing the speed of a signal

Which of the following is NOT an aspect of a waveform that can be modulated?

• Color

• Phase

• Amplitude

• Frequency

In FM radio, what aspect of the radio signal is modulated?

• Amplitude

• Frequency

• Phase

• Wavelength

What does FM stand for in FM radio?

• Frequency Modulation

• Fast Modulation

• Full Modulation

• Frequency Management

Which of the following is an example of modulation in communication systems?

• Increasing the speed of a car

• Changing the color of a light bulb

• Adjusting the volume of a speaker

• Modulating the frequency of a radio signal