Frequency-change signaling
Encyclopedia
In telecommunication
, 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
.
Telecommunication
Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...
, frequency-change signaling is a telegraph signaling method in which one or more particular frequencies
Frequency
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...
correspond to each desired signaling condition of a telegraph code
Code
A code is a rule for converting a piece of information into another form or representation , not necessarily of the same type....
. The transition from one set of frequencies to the other may be a continuous or a discontinuous change in the frequency
Frequency
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...
or phase
Phase (waves)
Phase in waves is the fraction of a wave cycle which has elapsed relative to an arbitrary point.-Formula:The phase of an oscillation or wave refers to a sinusoidal function such as the following:...
.