RE: re Digital TV !!!OFF TOPIC!!!

[Mike Griffiths <mike@xxxxxxx>]

For the record
The interlace system was devised to stop flicker
On early TV sets using a non interlaced TX systm produced unacceptable
flicker

Now High Def is going towards Progressive scan (Non Interlaced) they are
having the same problem!!
Mike

-----Original Message-----
From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
Sent: Sat 19 Jan 02 00:39
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] re Digital TV !!!OFF TOPIC!!!


> Why should that be, I wonder?  Sony seem to have acknowledged
> the fact that there can be problems with 100Hz pictures,
> because they're producing 50/100 switchable models now, but I
> don't understand what the issue is in the first place.

Something else I forgot to mention is that the actual format of a video
image makes 100Hz processing difficult ... The way that a full image is
made up of two interlaced frames (to reduce the bandwidth needed) means
that 100Hz processing is trying to create images at a high frame rate
using source data for consecutive frames which hold an image that is
1/25th of a second different to the previous one...

....basically what this means is that if you simply grab two frames and
display then in one go then you get an image which looks like it has
torn.

Phil


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