In
telecommunications, the term carrier shift has the following meanings:
#In the
transmission
Transmission may refer to:
Medicine, science and technology
* Power transmission
** Electric power transmission
** Propulsion transmission, technology allowing controlled application of power
*** Automatic transmission
*** Manual transmission
*** ...
of
binary or
teletypewriter signals,
keying
Keying may refer to:
* Keying (electrical connector), used by electrical connectors to prevent mating in incorrect orientation
* Keying (graphics), a technique for compositing two full frame images together
* Keying (official) (1787–1858), a M ...
in which the frequency of the
carrier signal is shifted in one direction for marking signals and in the opposite direction for spacing signals.
#In
amplitude modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to ...
, a condition that results from imperfect modulation in which the positive and negative excursions of the modulating
envelope are unequal in amplitude.
''Note 1:'' The carrier shift results in a change in
carrier power.
''Note 2:'' The carrier shift may be a shift to a higher or to a lower frequency.
{{FS1037C MS188
Radio modulation modes