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S/n
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- Signal-to-noise ratio
- Shipping note
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Уведомление об отгрузке, русский
Signal-to-noise ratio, английский
- (snr) is the ratio of the signal amplitude to the total noise
- The ratio between useful television signal and disturbing noise or snow.
- Signal to noise ratio, a measurement of the noise level in a signal expressed in db (decibels). in a video signal values from 45db to 60db produce an acceptable picture. less than 40db is likely to produce a “noisy” picture.
- Отношение сигнал
- The ratio of signal power to noise power in a detector
- The ratio in decibels between an audio signal voltage and noise voltage. a device with a low signal-to-noise ratio is considered noisy, and a device with a high signal-to-noise ratio is considered clean or quiet, with little background noise accompanying the signal.
Shipping note, английский
Уведомление об отгрузке
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Shipping note, английский
Уведомление об отгрузке
Sailings, английский
A navigator’s collective term for various methods of calculating course, distance, latitude, longitude, and departure. a dozen examples are given, some of which are no longer used. • plane sailing: following a course plotted without considering the curvature of the earth. • spherical sailing: a sailing that does consider the spherical (spheroidal) shape of the earth. • traverse sailing: uses the principles of plane sailing to determine the equivalent course and distance made good while following a track consisting of a series of rhumb lines. • middle-latitude sailing: a method of converting departure into difference of longitude, or vice versa, by assuming that such a course is steered at the middle or mean latitude. • parallel sailing: occurs when the course is 090° or 270° true. • meridian sailing: occurs when the course is 000° or 180°. • mercator sailing: applies when the various elements are considered in their relation on a mercator projection. • rhumb-line sailing: the term used when a rhumb line is followed. • great-circle sailing: occurs when a great circle track is followed. • composite sailing: a modification of great circle sailing used when it is desired to limit the highest latitude. • current sailing: a term occasionally used to refer to the process of determining the effect of a current on the direction of motion of a vessel or its predicted course made good. • dead reckoning: not really a sailing so much as an estimate of position arrived at by calculating course, speed, and drift, without the benefit of observations (see also estimated position).
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