Amplitude Modulation

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Amplitude Modulation

1. In general, modulation in which the amplitude of a wave

is the characteristic subject to variation.
2. Specifically, in telemetry those systems of modulation in which each component frequency, f, of the transmitted intelligence produces a pair of sideband frequencies at carrier frequency plus f and carrier minus f.
In special cases: (a) the carrier may be suppressed, (b) either the lower or upper sets of sideband frequencies may be suppressed; (c) the lower set of sideband frequencies may be produced by one or more channels of information and the upper set of sideband frequencies may be produced by one or more other channels of information; (d) the carrier may be transmitted without intelligence carrying sideband frequencies.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use