[opendtv] Re: France bids farewell to SECAM

The 405/25 in 5 MHz will definitely have more horizontal sharpness then
525/30 in 6 MHz If VSB band in NTSC is 1.8 MHz the VSB in 405/25 at 5 MHz
would be approximately 1.5 MHz - the baseband bandwidth in 405/25 will be
3.5 MHz In NTSC the baseband bandwidth of 4.2 MHz ideally allows
approximately 267 Horizontal pixels. In the 405/25 system the 3.5 MHz
baseband bandwidth allows 346 Horizontal pixels. So it will give 30%
increase in horizontal resolution. At the same time lower line and frame
count gives 23% drop in vertical resolution and 17% drop in temporal
resolution. Since vertical resolution was masked by interlaced artifacts and
temporal nobody cared at that time the images looked sharper. 

Best Regards,

Mike Tsinberg
http://www.keydigital.com        


-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Mark Schubin
Sent: Wednesday, December 07, 2011 5:42 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: France bids farewell to SECAM

On 12/7/2011 5:00 PM, Olivier Houot wrote:
> There were discussions on a french forum with a canadian guy that has 
> moved a lot and lived under the three standards at one time or 
> another. He experimented from the Montreal island (circa 2006, i 
> believe). He said that by playing with the settings, he could get a 
> nice picture from Radio-Canada, but when turning to american 
> broadcasts (all by air) from ABC, NBC, CBS, chromatic accuracy was 
> degraded, and it was not possible to compensate with the settings in a 
> completely satisfying way. Also, it was different from channel to channel.
Don't ascribe to technology that which can be explained by poor practice.

Post-WWII but pre-NTSC-color, a delegation of Americans evaluated British
television and found it consistently sharper.  That was when the U.S. was
525/30 in 6 MHz channels and the UK was 405/25 in 5 MHz channels.

TTFN,
Mark

 
 
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:

- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org 

- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.


 
 
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:

- Using the UNSUBSCRIBE command in your user configuration settings at 
FreeLists.org 

- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word 
unsubscribe in the subject line.

Other related posts: