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Phase-shift keying (psk)
| Fiber Optic Glossary |
1) in digital transmission, angle modulation in which the phase of the carrier discretely varies in relation, either to a reference phase or to the phase of the immediately preceding signal element, in accordance with data being transmitted. 2) in a communications system, the representation of characters, such as bits or quaternary digits, by a shift in the phase of an electromagnetic carrier wave with respect to a reference, by an amount corresponding to the symbol being encoded. also called biphase modulation, phase-shift signaling.
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Transmission, английский
- Passage of electromagnetic radiation through a medium.
- Transmisión
- The property in a merchantman, or a share therein, transmitted in
- Передача; привод; коробка передач; трансмиссия; прохождение; распространение ~ of loads передача нагрузок
- The transport of high voltage electricity. this is achieved with a transmission network (or grid). generally the network will connect large generators to lower voltage distribution networks where it will be transported to the majority of electricity consumers. alternatively, large scale electricity users may connect directly to the transmission network. management of transmission is a natural monopoly due to the economies of scale inherent to it. transmission system operator (tso) (also transmission network operator-
- The sending of information over a communications line or a circuit.
- The transportation of electric energy in bulk from a source or sources of supply to other systems or parts of a single system.
- Transfer of pathogens from one host to another
Modulation, английский
- Изменение характеристик несущей в соответствии с информативным сигналом
- Модуляция
- The process, or results of the process, whereby some characteristic of one signal is varied in accordance with another signal. the modulated signal is called the carrier. the carrier may be modulated in three fundamental ways: by varying the amplitude, called amplitude modulation; by varying the frequency, called frequency modulation; by varying the phase, called phase modulation.
- The process by which some characteristic (i.e., amplitude, phase) of one rf wave is
- The process by which some characteristic (i.e., amplitude, phase) of one rf wave is varied in accordance with another wave (message signal).
- The coding of information onto a carrier frequency. may use amplitude, frequency, phase, or time, plus many forms of on/off digital coding
- The ability to superimpose an external signal on the output beam of the laser as a control.
- The process by which the characteristic of one wave (the carrier) modifies another wave (the signal). examples include amplitude modulation (am), frequency modulation (fm), and pulse-coded modulation (pcm).
- N модуляция modul|e
Immediately, английский
Немедленно; непосредственно
Accordance, английский
Соответствие
Communications, английский
- Средства связи; связь 158
- Средства связи; связь
- [1] general: the transfer of information according to agreed conventions. [2] information technology; the representation, transfer, interpretation, and processing of data between and
- Связь; система связи; коммуникации; пути сообщения
Representation, английский
- N репрезента- ция, представление knowledge ~ представление знаний internal ~ псхл. внутреннее представление mental ~ ментальная репрезентация
- A collateral statement of such facts not inserted on the policy of insurance, as may give the underwriters a just estimate of the risk of the adventure. (see warranty.)
- A representation is a set of conventions about how to describe a class of things. representation will generally consist of four parts: 1. a lexicon that determines which symbols are in it vocabulary; 2. a structural part that describes the constraints on the symbols; 3. a collection of methods or procedures that allow the symbols to be manipulated and queried; and 4. a semantics that specifies the meaning of the symbols and their relationships. re-ranking in handwriting and text recognition systems, the task of re-ranking allows the candidate interpretations developed by the recognizer to be ranked or scored according to the language model. see also: word n-gram re-ranking, word-tag model.
- If something stands in place of or is chosen to substitute for something else, the former is considered a representation of the latter. e.g., representation of constituencies in government, linguistic representation of an event (->symbol). the 66 belief that all knowledge is a representation of the properties of the real world is as unacceptable as the insistence that all descriptions or messages are about something else.
Characters, английский
Certain marks invented for shortening the expression of mathematical calculations, as +,—, ?, ?, =, : :: :, [sq], &c.
Quaternary, английский
- Квадратурный quaternary logicчетырехзначная логика
- The period of the cenozoic era of geologic time, extending from the end of the tertiary period (about 1.6 million years ago) to the present and comprising two epochs, the pleistocene (ice age) and holocene (recent); also, the corresponding (time-stratigraphic) "series" of earth materials. gg
Electromagnetic, английский
Corresponding, английский
Соответствующий
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Double-window fiber (dual window fiber), английский
1) multimode fibers optimized for 850 nm and 1300 nm operation. 2) single-mode fibers optimized for 1310 nm and 1550 nm operation.
Medium access control (mac), английский
1) a service feature or technique used to permit or deny use of the components of a communication system. 2) a technique used to define or restrict the rights of individuals or application programs to obtain data from, or place data onto, a storage device, or the definition derived from that technique.
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