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In telecommunication, the term carrier shift has the following meanings:
- In the transmission of binary or teletypewriter signals, keying in which the carrier frequency is shifted in one direction for marking signals and in the opposite direction for spacing signals.
- In amplitude modulation, 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.