class-wide types - definizione. Che cos'è class-wide types
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Cosa (chi) è class-wide types - definizione

CLASSIFICATION OF A RADIO SIGNAL
Class (emission); Emission types; F1B; J3E; A3E; R3e; F3e

wide-angle lens         
  • Cross-section of a typical retrofocus wide-angle lens.
  • How focal length affects photograph composition. Three images depict the same two objects, kept in the same positions. By changing focal length and adjusting the camera's distance from the pink bottle, it remains the same size in the image, while the blue bottle's size appears to dramatically change. Also note that at small focal lengths, more of the scene is included.
  • Field of view in APS-sized digital cameras is the same as that of a longer lens, increased by [[crop factor]], on a full-frame 35 mm format camera.
  • Effective focal length is measured from the sensor to where the light cone going to the sensor is the same size as the lens front opening.
  • Cross-section of a typical short-focus wide-angle lens.
LENS WHOSE FOCAL LENGTH IS SUBSTANTIALLY SMALLER THAN THE FOCAL LENGTH OF A NORMAL LENS FOR A GIVEN FILM PLANE
Wide angle lens; Wide-angle camera; Wide-angle camera lens; Wide-angle photography; Short lens
(wide-angle lenses)
A wide-angle lens is a lens which allows you to photograph a wider view than a normal lens.
N-COUNT
Wide-angle lens         
  • Cross-section of a typical retrofocus wide-angle lens.
  • How focal length affects photograph composition. Three images depict the same two objects, kept in the same positions. By changing focal length and adjusting the camera's distance from the pink bottle, it remains the same size in the image, while the blue bottle's size appears to dramatically change. Also note that at small focal lengths, more of the scene is included.
  • Field of view in APS-sized digital cameras is the same as that of a longer lens, increased by [[crop factor]], on a full-frame 35 mm format camera.
  • Effective focal length is measured from the sensor to where the light cone going to the sensor is the same size as the lens front opening.
  • Cross-section of a typical short-focus wide-angle lens.
LENS WHOSE FOCAL LENGTH IS SUBSTANTIALLY SMALLER THAN THE FOCAL LENGTH OF A NORMAL LENS FOR A GIVEN FILM PLANE
Wide angle lens; Wide-angle camera; Wide-angle camera lens; Wide-angle photography; Short lens
In photography and cinematography, a wide-angle lens refers to a lens whose focal length is substantially smaller than the focal length of a normal lens for a given film plane. This type of lens allows more of the scene to be included in the photograph, which is useful in architectural, interior and landscape photography where the photographer may not be able to move farther from the scene to photograph it.
https://en.wikipedia.org/wiki/Wide-angle_lens
Wide Awakes         
  • A Wide Awakes parade in [[Lower Manhattan]], one of a series of political rallies held in New York, Philadelphia, Chicago, Cleveland, and Boston during the first week of October 1860.
  • A membership certificate for the Wide-Awake Club: “Free speech, free soil, free men. This is to certify that... is a member of the... Wide-Awake Club.”
  • Old Capitol building]], Springfield, Illinois
1860S REPUBLICAN YOUTH ORGANIZATION
Wide Awake Parade; The Wide Awakes; Wide-Awakes; Wide Awake Party
The Wide Awakes were a youth organization and later a paramilitary organization cultivated by the Republican Party during the 1860 presidential election in the United States. Using popular social events, an ethos of competitive fraternity, and even promotional comic books, the organization introduced many to political participation and proclaimed itself as the newfound voice of younger voters.
https://en.wikipedia.org/wiki/Wide_Awakes

Wikipedia

Types of radio emissions

The International Telecommunication Union uses an internationally agreed system for classifying radio frequency signals. Each type of radio emission is classified according to its bandwidth, method of modulation, nature of the modulating signal, and type of information transmitted on the carrier signal. It is based on characteristics of the signal, not on the transmitter used.

An emission designation is of the form BBBB 123 45, where BBBB is the bandwidth of the signal, 1 is a letter indicating the type of modulation used of the main carrier (not including any subcarriers which is why FM stereo is F8E and not D8E), 2 is a digit representing the type of modulating signal again of the main carrier, 3 is a letter corresponding to the type of information transmitted, 4 is a letter indicating the practical details of the transmitted information, and 5 is a letter that represents the method of multiplexing. The 4 and 5 fields are optional.

This designation system was agreed at the 1979 World Administrative Radio Conference (WARC 79), and gave rise to the Radio Regulations that came into force on 1 January 1982. A similar designation system had been in use under prior Radio Regulations.

https://en.wikipedia.org/wiki/Types of radio emissions
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