Tecnología de la televisión: del disco de Nipkow a la revolución numérica [ Carmen Peñafiel] on *FREE* shipping on qualifying offers. Lejona. Nipkow-Disk Category:Nipkow disks enwiki Nipkow disk; eowiki Nipkov- disko; eswiki Disco de Nipkow; frwiki Disque de Nipkow; glwiki Disco de Nipkow . Deep Red Leather-like Accent Chair, Small Office Waiting Area Chair – perfect for small spaces, the clean lines and art deco look of this chair are almost as great.
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March Learn how and when to remove this template message. One of the advantages of using a Nipkow disk is that the image sensor that is, the device converting light to electric signals can be as simple as a single photocell or photodiodesince at each instant only a very small area a pixel is visible through the disk and viewportand so decomposing an image into lines is done almost by itself with little need for scanline timing, and very high scanline resolution.
Another advantage is that the receiving device is very similar to the acquisition device, except that the light-sensitive device is replaced by a variable light source, driven by the signal provided by the acquisition device.
This article needs additional citations for verification. However the maximum number of scanlines is much more limited, being equal to the number of holes on the disk, which in practice ranged nippkow 30 towith rare hole disks tested.
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When spinning the disk while observing an object “through” the risco, preferably through a relatively small circular sector of the disk the viewportfor example, an angular quarter or eighth of the disk, the object seems “scanned” line by line, first by length or height or even diagonally, depending on the exact sector chosen for observation.
By spinning the disk rapidly enough, the object seems complete and capturing of motion becomes possible.
File:Disco nipkow 24.svg
The scanning disk can be replaced by a polygonal mirror, but this suffers from the same problem — lack of integration over time. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. These facts helped immensely in building the first mechanical television accomplished by the Scottish inventor John Logie Bairdas well as the first “TV-Enthusiasts” communities and even experimental image radio broadcasts in the s.
When the disk rotates, the holes trace circular ring patterns, with inner xisco outer diameter depending on each hole’s position on the disk and thickness equal to each hole’s diameter.
This can be intuitively understood by covering all of the disk but a small rectangular area with black cardboard which stays fixedspinning the disk and observing an object through the small area. This page was last edited on 28 Novemberat The resolution along a Nipkow disk’s scanline is potentially very high, being an analogue scan. Summary [ edit ] Description Disco nipkow The devices using them were also noisy and heavy with very low picture quality and a great deal of flickering.
The scanning system simply “picks off” the accumulated charge as it sweeps past each site on the target. This file is made available under the Creative Commons CC0 1. If the sensor is made to control a light behind a second Nipkow disk rotating synchronously at the same speed and in the same direction, the nipjow will be reproduced line-by-line.
Nipkow disk nipokw with 24 holes and window. Unsourced material may be challenged and removed.
Nipkow disk – Wikipedia
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. Archived from the original on The patterns may or may not partially overlap, depending on the exact construction of the disk. From Wikipedia, the free encyclopedia. The device is a mechanically spinning disk of any nipkoow material metal, plastic, cardboard, etc.
Another drawback of the Nipkow nkpkow as an image scanning device: Iconoscopes and their successors accumulate energy on the target continuously, thereby ce energy over time. Some means of synchronizing the disks on the two devices must also be devised several options are possible, ranging from manual to electronic control signals. Views View Edit History. In other projects Wikimedia Commons. These holes are positioned to form a single-turn spiral starting from an external radial point of the disk and proceeding to the center of the disk.
The actual amount of light gathered is instantaneous, occurring through a very small aperture, and the net yield is only a nipkpw percentage of the incident energy. Views Read Edit View history. Simple calculations show that, for equally sensitive photosensitive receptors, the iconoscope is hundreds to thousands of times more sensitive than the disk or the Farnsworth scanner.
A simple acquisition device can be built by nipkos an electrical motor driving a Nipkow disk, a small box containing a single light-sensitive electric element and a conventional image focusing device lens, dark boxetc. A lens projects an image of the scene in front of it directly onto the disk.
So the ideal Nipkow disk should have either a very large diameter, which means smaller curvaturedisfo a very narrow angular opening of its viewport. The acquisition part of the system was not much better, requiring very powerful lighting of the subject.
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. The holes may also be square for greater precision. Television technology History of television German inventions in science in Germany.
This page was last edited on 15 Julyat A Nipkow disk sometimes Anglicized as Nipkov disk; patented inalso known as scanning diskis a mechanical, rotating, geometrically operating image scanning device, patented in by Paul Gottlieb Nipkow.