🚀 go-pugleaf

In <58q2ke$dun$1@aggedor.rmit.edu.au>, rnuto@minyos.its.rmit.EDU.AU (Tim O'Connor) writes:
>Can anyone explain to me the difference in quality between a standard 50
>Hz PAL TV and the so-called 100Hz models, like the Loewe 100 Hz Calida Vs
>the 50 Hz Calida?
>
>Are there any drawbacks to such technology?
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>~   Timothy O'Connor, Multimedia programmer for the Faculty of Nursing,  ~
>~   RMIT.  All opinions expressed are my own, and do not represent RMIT. ~
>~                Home page: http://toc.nu.rmit.edu.au                    ~
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>

Normal 50Hz TV's display 25 frames per second. These frames are interlaced. When the 
TV "draws" onto the scren using the electron gun, it draws the odd lines first, then
goes back to the top and draws the even numbered lines. It draws top to bottom 50 times
every second (our 240V mains is 50Hz, in the USA they have 60Hz mains, hence 30 frames
per second) therefore 25 full frames are displayed.

This causes some flicker which may be annoying. A 100Hz TV digitally stores the picture and
then displays it at twice the rate as normal. This reduces the flicker to un-noticable levels.
It is a simialr principal to the refresh rate of computer monitors.

I don't know of any disadvantages other that they tend to be very expensive ;-)


Leon Gross

Reiter Electronics / Becker Automotive Systems
PO Box 307  Surry Hills  NSW  2010  Australia
reiter@ibm.net  or  leon@ibm.net
Ph.  +61 2 9380 6599
Fax +61 2 9380 5910