Re: Help me if you can!
- From: "Frank Raffaeli" <SNIPrf_man_frTHIS@xxxxxxxxx>
- Date: 30 Nov 2006 01:55:44 -0800
On Nov 30, 4:23 am, "Myauk" <aungkokot...@xxxxxxxxx> wrote:
Hi
I am studying the T.V systems for different regions for the DVD
Recorders I am working on. The regions are Asia Pacific, LATAM, NAFTA
and Europe.
I found a document explaining about the systems athttp://en.wikipedia.org/wiki/Broadcast_television_systems. I came to
realize that there are monochrome standards are assigned a letter
designation (A-M) in combination with color systems. (NTSC, PAL,
SECAM)
And the product I am working has tuners for systems described as: PAL
B/G, PAL D/K, SECAM L/L', PAL I. At the same time some documents
sometimes describe again: B/G, I, L/L', D/K whithout color system
designations for the same product.
After studying the table provided by wikipedia and the reference
documents, I wonder what systems they really are using for the regions
APAC, LATAM and Europe.
Is there any NTSC B/G or NTSC I ?
Aganin it describes for LATAM there are only systems M and N.
Can anybody explain to me about it clearly?
There are three layers: Channel standard, Video (Chroma) standard, and
Sound (stereo) standard.
Channel standard refers to the spacing between the (analog) video and
audio carrriers:
L, D/K : (France, China, Czech(old) = 6.5 MHz)
I : UK, HK = 6.0 MHz
B/G : Italy, Germany, Australia, Sweeden (others) = 5.5 MHz
M : North America, Japan, Korea, Taiwan = 4.5 MHz
Chroma or video standard refers to the color encoding
SECAM : used with D/K or L has two separate chroma components on each
alternate line, combined later.
PAL : used with D/K or B/G (and sometimes M) encodes color hue in the
phase of the subcarrier. Alternate lines shift phase by 180 degrees to
equalize some channel errors.
NTSC : used with M, transmits color hue as the phase of the chroma
subcarrier. An additional phase reference is transmitted during the
vertical interval for hue correction.
L' is a notation that means the local oscillator is low-side, rather
than high-side injected.
Sound standards are:
A2 - some of Europe, Korea, Some of China, others
NICAM - some of Europe, UK, HK, Sweeden, others
BTSC - North America
EIAJ - Japan
Looking at tuner specs?
Regards,
Frank Raffaeli
http://www.aomwireless.com/
.
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- From: Myauk
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