[HDCblGuy]

I am going to be purchasing a Toshiba DST3000 and I am having trouble on finding information on how it handles 720P feeds. I have heard of some STBs downconverting 720p feeds to 480i/p (Panasonic?). I was wondering if the DST3000 would downconvert or upconvert 720p. I will also soon have a Toshiba 65HX81 which converts 480i/p to 540p and leaves 1080i alone; it does not accept 720p.


HDCblGuy

 

[Ken Blauvelt]

Accepts 720p.


Sideconverts (or downconverts) to 1080i.


See: 720p > 1080i
http://www.alvyray.com/DigitalTV/Naming_Proposal.htm

 

[Allen A]

It is my understanding that most later generation boxes convert 720P to 1080i. I am reasonably sure that the DST-3000 is one of those. I won't use the term "upconvert" or "downconvert" here because that is controversial when applied to conversion from 720P to 1080i. My RCA DTC-100 does convert 720P to 1080i, but my Panasonic TU-DST50 downconverts to 480P. I usually do not watch ABC HD programs on the Panasonic for that reason.

 

[mkerdman]

"My RCA DTC-100 does convert 720P to 1080i, but my Panasonic TU-DST50 downconverts to 480P. "


Are you certain 720P is downconverted by the DST50 to 480P. I have watched ABC HD this season on my DST50 and it looks better than 480P to me.



Murray Kerdman

 

[proufo]

Quote:

Originally posted by Ken Blauvelt Sideconverts (or downconverts) to 1080i. See: 720p > 1080i http://www.alvyray.com/DigitalTV/Naming_Proposal.htm

> Proposal: 1080I Should Be Renamed 540I - and 480I Should Be Renamed 240I


This would be truer but less marketable. It's all a matter of money.


But average resolution of 540i is still quite high, if the physical display can keep 1080 lines in the right position (no overlap and no gap between fields). With the right display and perhaps for most images, 1080i should be equal or better than 720p if done right.


1080i provides a longer obsolescence path, that may end with true 1080p with full horizontal resolution. 720p is already here, not as much money in it.

 

[Ken H]

Quote:

Originally posted by mkerdman "My RCA DTC-100 does convert 720P to 1080i, but my Panasonic TU-DST50 downconverts to 480P. " Are you certain 720P is downconverted by the DST50 to 480P. I have watched ABC HD this season on my DST50 and it looks better than 480P to me.

Yes, for the component video output, TU-DST tuners downconvert 720p to 480p, assuming you have the output switch set in the 1080i/480p mode.


The TU-DST51 has an all native mode (everything output in it's native format) a 1080i/480p mode (1080i in 1080i, everything else in 480p), a 480p mode (everything to 480p) and a 480i mode (everything to 480i). I think the 50 is identical, perhaps someone can confirm this.


The ABC 720p signal does look better in 480p, than, for example Fox's native 480p.


If your display will do 480p, 720p and 1080i, and the TU-DST is set for all native, the ABC 720p will look a lot better than a 480p downconversion.

 

[mkerdman]

On my Toshiba 65H80 and DST-50W the ABC 720p signal on for instance "Alias" does look far better (in 480p) than, for example Fox's native 480p and some lesser DVD's.


Murray Kerdman

 

[proufo]

Quote:

Originally posted by mkerdman On my Toshiba 65H80 and DST-50W the ABC 720p signal on for instance "Alias" does look far better (in 480p) than, for example Fox's native 480p and some lesser DVD's. Murray Kerdman

Any idea on how 720p is scaled to 480p?


Is it just a simple elimination of every third line or a full scaling across the complete image?


Thanks in advance.