Re: Currently-Available Highest-Quality Linear PCM Video?

Radium wrote:
<snip>
G-Squared
You really need to go look things up and not argue about things you
apparently know little to nothing about. Bob Myers told you exactly
right about SD TV.

SDTV is not "first class"

You might be surprised if you saw a serial digital feed on a broadcast
monitor. Many folks would find it to be totally satisfactory -- if they
ever got to see it.


You can go look this up- the sample rate is 858 x h
rate = 13.5MHz for luma.

What about the color subcarrier sample rate? The horizontal frequency
sample rate?

There is no subcarrier for component digital. You didn't look it up.
The subcarrier is introduced when the component is encoded into
composite. This does not happen with DVD or SD Digital TV. The
horizontal 'sample rate' is a continuous 13.5 MHz with a new line
starting on every 858th sample and the vertical 262.5 X 858 samples.
The 2 chroma difference channels are each sampled 429 x H for another
858 time periods for a total data rate of 27MHz sample rate. Bump those
numbers up to 150MHz for HD.

The 720 is the active number of samples out of
the 858. That 'dead' time is to allow the CRT based monitors time to
retrace the Horizontal. The 480 line is computer talk for 525 line
system of which 483 are active. The remaining lines are to allow
Vertical retrace of a CRT monitor. If you think about it, LCD and
Plasma do not require retrace since there is no scanning, just counting
off samples.

That is why plasma and LCD are better than CRT. In addition, plasma is
better than LCD.

That has nothing to do with why LCD or Plasma is 'better' than a CRT.
You will find a good number people who think the CRT is a better image
even in HD. Much of what is 'bad' about the CRT is the support
electonics, mainly poor power supply regulation.

HDTV works in a similar fashion but the numbers are all
different.

IIRC, HDTV is a tad closer to "first class" than SDTV. Again, I could
be wrong.

Try ATSC.ORG. The monitor pixel ratios are often 4:3 or 16:9
to make square pixels but none of that is etched in stone. Rectangular
pixels are often used and just re-map the square into rectangular. Now
go study.

GG

GG again

.

Relevant Pages

  • Re: Currently-Available Highest-Quality Linear PCM Video?
    ... What about the color subcarrier sample rate? ... My LCD computer screen is 1280 X 1024 pixels. ... Vertical retrace of a CRT monitor. ... Plasma do not require retrace since there is no scanning, ...
    (sci.electronics.basics)
  • Re: Currently-Available Highest-Quality Linear PCM Video?
    ... What about the color subcarrier sample rate? ... That is why plasma and LCD are better than CRT. ...
    (sci.electronics.basics)
  • Re: Question on Analog vs. Digital Signals for Plasma TV
    ... Plasma or LCD will have a much nicer picture. ... Eventually the stores will no longer be selling CRT type monitors. ...
    (sci.electronics.repair)
  • Re: confused about contrast ratios
    ... the new set would be LCD or plasma. ... off the screen) the camera told me I needed a 1/3 second exposure. ... Well a CRT screen is refreshed once every 1/25 second so any exposure ...
    (uk.tech.digital-tv)
  • Re: confused about contrast ratios
    ... the new set would be LCD or plasma. ... Well a CRT screen is refreshed once every 1/25 second so any exposure faster than this would in my opinion give a false value. ... Why not read users reviews at http://www.avforums.com/forums/index.php then combine this with looking at what's on display in the stores. ...
    (uk.tech.digital-tv)