Re: Twitter vs Number of Lines
From: DAB sounds worse than FM (dab_is_at_low.quality)
Date: 02/15/05
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Date: Tue, 15 Feb 2005 15:20:25 GMT
Dave Martindale wrote:
> steve41@totalise.co.uk writes:
>
>> So, because the 1080i HDTV format uses significantly more lines than
>> are used on SDTV, is it fair to conclude that twitter will be less
>> of a problem for 1080i HDTV, and therefore the 0.7 factor can be
>> increased for the same amount of perceptible twitter?
>
> I'd say that should be true IF YOU ASSUME THAT THE HDTV AND SDTV
> IMAGES ARE THE SAME SIZE. (More precisely, the same angular size).
>
> However, since a major reason for the existence of HDTV is to give
> images that you can watch from closer (larger angle of view), this is
> a poor assumption. You'd be better off making some reasonable
> assumptions about viewing distances.
>
> If it turns out that the "normal" HDTV viewer sits only half as many
> picture heights from the screen as a normal SDTV viewer, then the
> actual angular spacing of the scanlines is about the same for both
> systems.
> In that case twitter might be expected to be the same too.
Thanks to both of you for your views.
-- Steve - www.digitalradiotech.co.uk - Digital Radio News & Info Find the cheapest Freeview, DAB & MP3 Player Prices: http://www.digitalradiotech.co.uk/freeview_receivers.htm http://www.digitalradiotech.co.uk/dab_digital_radios.htm http://www.digitalradiotech.co.uk/mp3_players_1GB-5GB.htm http://www.digitalradiotech.co.uk/mp3_players_large_capacity.htm
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