Frequency-change signaling

In telecommunications, frequency-change signaling is a telegraph signaling method in which one or more particular frequencies correspond to each desired signaling condition of a telegraph code. The transition from one set of frequencies to the other may be a continuous or a discontinuous change in the frequency or phase.<ref>Template:Cite book</ref>

See also

• Frequency-shift keying
• Frequency modulation

References

Template:Asbox