AVS Forum banner
Status
Not open for further replies.
1 - 4 of 4 Posts

·
Registered
Joined
·
111 Posts
Discussion Starter · #1 ·
Mark,



Sorry to use such a cheap trick to get your attention, but you expertise is needed over on the DLP forum.


The new Sharp Z9000 projector suffers from a serious video delay when processing interlaced NTSC or PAL images. The question is, do *all* video processors do this?


I just can't get this bl***y thread copying to work, so can you chime in on the 'Sharp lip-sync problems' in the DLP forum?



Thanks in anticipation!
 

·
Premium Member
Joined
·
8,100 Posts
Yes,


All processors add video delay.


* FLI2200 (Faroudja) and ClearMatrix based units (e.g., LEEZA) require 2 fields.


* Sil50X (Vigatec, iScan PRO) require 4 fields.


* Higher end units (Terranex) can use up to 7 fields...


The more fields, the more processing required and the image can (theoretically) be better.


A field is about 1/60th of a second - so more than 2 fields is usually noticeable.


The 3:2 pulltdown technique used by the Sharp 9000 is probably high enough to be noticeable. The same is said about the Panasonic plasma. Both use properietary 3:2 pulldown engines.


This is unavoidable - and requires help from the audio processor to resolve.


Uwe from Vigatec promised that when he gets a second to breathe, he will try and develop a general purpose audio delay engine for digital and audio systems that use Vigatec scalers.
 

·
Premium Member
Joined
·
4,176 Posts
Posted my reply in the DLP/LCD/DILA forum.


Also, the digital display can add a sync delay too (usually just 1/60th of a second), since it has to buffer incoming video for internal refresh rate conversion to the digital display's fixed internal refresh rate.


The video processor is more responsible for a lip sync delay. Some video processors do it better than others, but there is always a delay in video processing that cannot be avoided due to the requirement to buffer the even field and the odd field before you can merge the two fields into a progressive image.


Also, there can be a bigger delay with interlaced input than with progressive input in a digital display, because of the digital display's own internal video processor.
 
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Status
Not open for further replies.
Top