Carrier shift
Encyclopedia
In telecommunication
, the term carrier shift has the following meanings:
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.
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...
, the term carrier shift has the following meanings:
- In the transmissionTransmission (telecommunications)Transmission, in telecommunications, is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired, optical fiber or wireless...
of binaryBinary fileA binary file is a computer file which may contain any type of data, encoded in binary form for computer storage and processing purposes; for example, computer document files containing formatted text...
or teletypewriter signals, keyingKeying (telecommunications)Keying is a family of modulation forms where the modulating signal takes one of two values at all times. The goal of keying is to transmit a digital signal over an analogue channel. The name derives from the Morse code key used for telegraph signaling....
in which the carrier frequencyCarrier waveIn telecommunications, a carrier wave or carrier is a waveform that is modulated with an input signal for the purpose of conveying information. This carrier wave is usually a much higher frequency than the input signal...
is shifted in one direction for marking signals and in the opposite direction for spacing signals. - In amplitude modulationAmplitude modulationAmplitude modulation is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent...
, a condition that results from imperfect modulation in which the positive and negative excursions of the modulating envelopeEnvelopeAn envelope is a common packaging item, usually made of thin flat material. It is designed to contain a flat object, such as a letter or card....
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.