ACSB

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ACSSB Amplitude Compandored Single Sideband is a narrow-band modulation using a single sideband with a pilot tone, allowing an expander in the receiver to restore the amplitude that was severely compressed by the transmitter. (Note that most of the noise reduction circuits used in audio recording are also variations of companding.) This mode promised greater robustness and fade-resistance on HF than even SSB, but was pretty much leapfrogged in favor of spread spectrum, which solves the problem even better.

ACSB is being used by air to ground phones, as well as mobile satellites.

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