Talk:Bernard J. Lechner
 | This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
| |||||||||||
Untitled
[edit]Lechner distance definition is wrong. It should be something like this:
The Lechner distance is the distance between the viewer's eye and the TV's screen. Bernard Lechner estimated the average value in the US to be 9 feet. He derived this from housing plans and the thickness of couches and televisions (built from CRTs at the time).
Given the Lechner distance and knowing the visual acuity of the eye, one can calculate the minimum pixel size that the eye can distinguish. A viewer looking at a 25 inch television that is 9 feet away, cannot see detail finer than standard definition. A higher definition television (with the same 25 inch diagonal) would be unnecessary. As a result, there wasn't much pressure in the US to move to higher definition until televisions could be easily built larger than 25 inches.
The average value in Europe is called the Jackson distance. It is named for Richard Jackson, a researcher at Philips in Britain, who calculated the value to be 3 meters.
The average value in Japan is 4 feet (??? there is a name for this). Since Japanese sat closer, they would have benefited from 25 inch televisions with better than standard definition. In fact, Japan had developed an analog HDTV standard before digital started going in the US and Europe. — Preceding unsigned comment added by Mdnahas (talk • contribs) 22:55, 15 March 2014 (UTC)
External links modified
[edit]Hello fellow Wikipedians,
I have just modified one external link on Bernard J. Lechner. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
- Added archive https://web.archive.org/web/20131020054048/http://www.atsc.org/cms/index.php/communications/awards/322-the-2013-bernard-j-lechner-award to http://www.atsc.org/cms/index.php/communications/awards/322-the-2013-bernard-j-lechner-award
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).
This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).
- If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
- If you found an error with any archives or the URLs themselves, you can fix them with this tool.
Cheers.—InternetArchiveBot (Report bug) 13:23, 31 October 2016 (UTC)
External links modified
[edit]Hello fellow Wikipedians,
I have just modified one external link on Bernard J. Lechner. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
- Added archive https://web.archive.org/web/20090105221402/http://www.smpte.org/about/awards_program/progress_winners to http://www.smpte.org/about/awards_program/progress_winners
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).
- If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
- If you found an error with any archives or the URLs themselves, you can fix them with this tool.
Cheers.—InternetArchiveBot (Report bug) 10:03, 27 November 2017 (UTC)
Lechner Distance
[edit]The paragraph dealing with distance no longer offers references.
"The Lechner Distance chart" correspond to the optimal viewing distance in the ITU BT.500 which presents the optimal distances according to the definition based on the psychophysiological capacity of human vision.
On the subject of "the typical distance between a viewer and their television screen", it does not correspond to the results proposed by more robust and more recent scientific study which compiles different surveys which shows distances twice as large as what is attributed to Lechner. The Ergonomist (talk) 08:19, 10 April 2024 (UTC)