From: Alen Koebel <alen@home.com>
Newsgroups: alt.video.laserdisc
Subject: Re: MUSE HiVision LD listing?
Date: Wed, 05 Aug 1998 17:04:24 -0400
Organization: .
Lines: 40
Message-ID: <35C8C8D8.60BD@home.com>
NNTP-Posting-Host: it306.electro.com

Ivar wrote:
> 
> Thad Floryan wrote in message <6q71ud$f3r$1@nntp2.ba.best.com>...
>
> >A Yahoo search on "muse" revealed about eleventy-seven museums, so at this
> >point I don't know the specs.  Stay tuned; when the manuals are translated
> >I could provide some more info,
> 
> They provide very little info, here are some cold facts:
> 
> Hi-Vision production/studio format is fairly close to the SMPTE 240E
> standard.
> 
> Total lines pr. frame: 1125
> Active lines pr. frame: 1035
> Scanning: 2:1 interlaced
> Aspect ratio: 16:9 ( academy 1:1.33 source material will have black vertical
> bars )
> Field rate: 60Hz ( not 59.94Hz )
> 
> Typically stored as color differential component YPbPr.  If analogue
> storage, all components will have 30MHz bandwidth, not just the luma
> component.  

Only on tape. When broadcast and stored on "Hi-vision" 
laserdisc, the most common sources of analog HDTV signals, 
they are MUSE encoded and are hence reduced in bandwidth. 
Out of a MUSE decoder, luma is around 20 - 22 MHz and the 
color difference components are about 6.5 - 7 MHz. The MUSE 
analog compression scheme also subsamples the color difference
signals vertically by 2:1, which the bandwidth numbers can't 
show. Furthermore, the compression scheme causes a reduction 
in the resolution of moving areas of the picture (because it 
employs temporal subsampling in addition to spatial subsampling).
It all works amazingly well. Hi-vision laserdiscs are a joy to 
behold.

--------------------------------------------------------------
Alen Koebel    Video and Display Engineering   Electrohome Ltd
akoebel@electro.com    www.electrohome.com      (519) 744-7111