Modulation facts for kids
Modulation can mean:
- Modulation (music), the changing of a piece of music from one key to another.
- Frequency Modulation (FM) or Amplitude Modulation (AM), ways to send analog radio signals.
- Phase-shift keying and frequency-shift keying, ways to send digital signals.
Images for kids
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A low-frequency message signal (top) may be carried by an AM or FM radio wave.
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Waterfall plot of a 146.52 MHz radio carrier, with amplitude modulation by a 1,000 Hz sinusoid. Two strong sidebands at + and - 1 kHz from the carrier frequency are shown.
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A carrier, frequency modulated by a 1,000 Hz sinusoid. The modulation index has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.
See also
In Spanish: Modulación (telecomunicación) para niños
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Modulation Facts for Kids. Kiddle Encyclopedia.