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 Optical Feedback Optical feedback is the optical equivalent of acoustic feedback. The image on the monitor is then captured by the videocamera again, and fed back to
Наименование:

Optical Feedback

автор Lambert M. S. издательство Книга по Требованию Прочие виды транспорта
Cтраниц 96        мягкая обложка       
Аннотация:Optical feedback is the optical equivalent of acoustic feedback. The image on the monitor is then captured by the videocamera again, and fed back to the monitor in a continuous loop. High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The feedback occurs when a loop exists between an optical input, for example, a videocamera, and an optical output, for example, a television screen or monitor. (A simple example of optical feedback is an image cast between mirrors. ) In this GIF movie, and the JPG still image examples (right), light from a candle is received by a videocamera, amplified and then sent by cable to a monitor projecting electron beams on the inside of the monitor screen.
Автор: Lambert M. S.
Издательство: Книга по Требованию
Год:2010
Цена:
1386 руб
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Поиск: Optical Feedback



Радиорелейная связь

Увеличение запаздывания между компонентами многолучевого сигнала при СТР резко увеличивает мультипликативные помехи и, следовательно, кроме ухудшения энергетики приема, вызывает увеличение переходных помех при многоканальной телефонии. При передаче дискретной информации «память» канала ограничивает скорость передачи, поскольку появляются межсимвольные искажения. Однако пропускная способность многолучевого канала падает незначительно (на 17%); более того, она может быть восстановлена оптимальными методами передачи информации. Все существующие методы борьбы с мультипликативной помехой могут быть, -в принципе, разделены на следующие группы: 1. Метод накопления, при котором образуются несколько копий принимаемого сигнала, по-разному пораженного мультипликативной помехой. Эти копии комбинируются. 2. Метод адаптивного приема, при котором производится непрерывное или периодическое измерение характеристик среды распространения. Данные этих измерений используются для оптимизации выбора сигналов на передаче путем использования информационной обратной связи и оптимальной обработки сигналов на приеме. 3. Метод использования исправляющих кодов и обратной связи после решений (pos decisio feedback).
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