Talk:Nipkow disk

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Untitled[edit]

The date of invention of the Nipkow disk is 1884, not 1920, based on the Spanish edition of wikipedia and the book "Entorno al video" by Eugeni Bonet and others, Editorial Gustavo Gili, Barcelona, 1980, ISBN 84-252-0988-9; and http://www.teletronic.co.uk/televisiontimeline.htm.

Thanks. --190.209.64.208 (talk) 21:05, 15 August 2010 (UTC)[reply]

I believe a minor correction is required.

Under "Disadvantages" is the phrase

"Unlike the line resolution provided by a Nipkow disk, which is potentially very high, the maximum number of scanlines is much more limited"

I assume the contributor meant to refer to a technique OTHER than the Nipkow disk. I can't correct it as I don't know what technique the contributor had in mind.

Gbwadham 05:28, 14 February 2007 (UTC)[reply]

No, it's meant to contrast the resolution in the two dimensions. E.g. a disk with 30 holes can only resolve 30 scan lines, but potentially hundreds of elements along a scan line. Probably "line resolution" is a poor attempt at expressing that. Now that you know, maybe you can fix it. Dicklyon 05:55, 14 February 2007 (UTC)[reply]

Ok I have done it for you Gbwadham, please both of you revise the change I have made in that section and check it for accuracy. 203.219.105.240 (talk) 00:28, 8 November 2008 (UTC)[reply]

A Nipkow disk does not produce pixels[edit]

Nipkow disk TV is analog TV. There are discrete individual lines, but no pixels. As each hole moves continuously along its path, the photocell produces a continuous signal for each line. To have pixels, one would need to open the hole or trigger the photocell readout only at discrete identifiable points along the line, which Nipkow's apparatus does not do. Ernst Ruhmer's 5x5 photocell array TV system of 1909 produced pixels.

In an edit dating from 12:21, 19 March 2004, a statement was added here, suggesting that the small area visible at each moment is a "pixel", the quotation marks signaling that this should not be taken at face value. In an edit on 04:36, 2 May 2004 the quotation marks were removed. I have now removed the mentioning of the pixel.

Regards --Liberatus (talk) 14:30, 5 March 2019 (UTC)[reply]