What are amplitude modulation principles regarding carrier waves and message signals?
Understand the Problem
The question is discussing the principles of amplitude modulation, specifically focusing on the relationship between the carrier wave and the message signal, including conditions for full modulation and the time domain presentation of the modulated wave.
Answer
AM varies the carrier wave's amplitude with the message signal. 100% modulation occurs when levels match.
Amplitude modulation involves varying the amplitude of a carrier wave in proportion to the message signal. When the message signal matches the carrier signal level, 100% modulation occurs. The modulated wave's peaks mirror each other, and carrier frequency remains higher than the message frequency.
Answer for screen readers
Amplitude modulation involves varying the amplitude of a carrier wave in proportion to the message signal. When the message signal matches the carrier signal level, 100% modulation occurs. The modulated wave's peaks mirror each other, and carrier frequency remains higher than the message frequency.
More Information
100% modulation means the amplitude of the carrier wave is fully varied by the message signal, showing maximum amplitude decrease and increase.
Tips
Avoid confusing amplitude modulation with frequency or phase modulation. Ensure the carrier frequency is always greater than the message frequency to maintain integrity.
Sources
- Amplitude modulation - Wikipedia - en.wikipedia.org
- What is Amplitude Modulation? — Keysight Oscilloscope Glossary - keysight.com
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