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Frequency-exchange signaling
From Wikipedia, the free encyclopedia
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In telegraphy, frequency-exchange signaling or two-source frequency keying is frequency-change signaling in which the change from one significant condition to another is accompanied by decay in amplitude of one or more frequencies and by buildup in amplitude of one or more other frequencies.
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (May 2020) |
Frequency-exchange signaling applies to supervisory signaling and user-information transmission.
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References
This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).
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