--- On Wed, 8/31/11, Rieni <[email protected]> wrote:
> Again, the Tascam stays in sync for at least 30 minutes without
> requiring a Genlock. It's the minimum a device like that
> should be able to do, they are designed for musicians originally and
> you don't want the recording go off-beat by 1/24th of a second after
> 5 minutes already, right? That's what the Zoom does and it's really
> bad. I'm not ditching Zoom though, they make great pre-amps/effect
> boxes for electric guitars.
>
> And all 24fps camera capture at 23.976 fps exactly. Have
> some trust in modern technology please :-)
>
> (could someone pls explain briefly the reason for 23.976
> instead of 24fps? I keep forgetting)
Google for pulldown.
Mostly it goes back to when color was added to NTSC analog television. BC
(before color) NTSC was 60 fields (30 frames) per second, mainly due to using
the common 60 Hz AC line frequency for a timing signal.
By the time color came along it was possible to build a timing signal generator
circuit into the TV. The frame rate was changed to 29.976 Hz for two main
reasons. First, some extra bandwidth was needed for the chroma information and
second, the "odd" rate prevented harmonic interference between the AC line
frequency and the TV circuitry which could cause distortions and noise in the
video image.
When transistors came along and transmission equipment improved, NTSC could
have gone back to a true 30 frames per second, but that would have instantly
made obsolete every existing color NTSC TV.
I never thought about this before, how did pre-color monochrome TVs handle the
29.976 rate? Or were true monochrome NTSC broadcasts made at 30 FPS?
I'm pretty certain that ATSC monochrome broadcasts are really just greyscale
color - especially the ones that have the annoying station ID bug in color.
So the people to blame for 23.976 are the men who came up with 29.976 for
analog color NTSC broadcast television.
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Adobe-Premiere/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/Adobe-Premiere/join
(Yahoo! ID required)
<*> To change settings via email:
[email protected]
[email protected]
<*> To unsubscribe from this group, send an email to:
[email protected]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
