Re: OT: Better sleep with colored LEDs?

In <nfGdnQLhTp77jwbUnZ2dnUVZ_t7inZ2d@xxxxxxxxxxxxx>, Michael A. Terrell
wrote:

Don Klipstein wrote:

In article <4Z-dnXnZjt16-AXUnZ2dnUVZ_sfinZ2d@xxxxxxxxxxxxx>, Michael A.
Terrell wrote:

"miso@xxxxxxxxx" wrote:

Michael A. Terrell wrote:

Not yet. I gave away five today to different people, and more are
supposed to be picked up tomorrow. It was time to thin the herd a
little.


Amazing that for accurate color, nothing can touch a CRT. CRT
technology is very over a century old. That is a hell of a run.


My HP1130 22" CRT monitor died a few weeks ago. It would do 2048 *
1536 resolution, and had two video inputs. Excellent video.

As a former broadcast engineer, it was amazing the video quality you
could get with NTSC in the studio, only to have it turned to crap with
cheap imported TV sets. A good $14,000 set of matched plumicons, with a
45,000 lens on a 20 year old RCA TK46A studio camera, fed to a $7,000
triangular-dot studio monitor could take your breath away.

As it turns out, getting both brightness and color info at 30 frames per
second through about 4.5 MHz of bandwidth in an analog channel is going to
get some sort or another of horizontal blurring or horizontal smearing. I
never saw color analog broadcast TV look great in anyone's home, not even
back when they still made TVs in the USA, not even back when most TVs had
tubes, even for the high voltage rectifier.

Why would you ever think that tubes give a better picture?

Not that I thought they did even though they were more expensive - I
never saw analog color broadcast on a home TV of any kind look really
great.

What makes you think in studio video was bandwidth limited to 4.5 MHz
or that it was composite video?

I was talking about what I saw in people's homes on color TVs - NTSC.

Also, the US NTSC (System 'M') sound IF
is 4.5 MHZ from the visual carrier, so it is less than 4.2 MHz.
Monochrome had more video bandwidth, because you didn't need the color
subcarrier and guard band.

That explains stuff, though I thought they worked out luminnce and color
info sharing part of a channel - lines in the field get color noise that
is opposite that from previous tracing of the line or something like that.
I remember looking for this with a magnifying glass several years ago when
I heard of this, and saw it.

<SNIP>

- Don Klipstein (don@xxxxxxxxx)
.

Relevant Pages

  • Re: designing of frame grabber
    ... Michael A. Terrell wrote: ... I know color is an add-on to composite video. ... or use a single connector with a harness to ...
    (sci.electronics.design)
  • Re: OT: Better sleep with colored LEDs?
    ... Michael A. Terrell wrote: ... Excellent video. ... second through about 4.5 MHz of bandwidth in an analog channel is going to ... Don Klipstein ...
    (sci.electronics.design)
  • Re: designing of frame grabber
    ... Michael A. Terrell wrote: ... I know color is an add-on to composite video. ... or use a single connector with a harness to ...
    (sci.electronics.design)
  • Re: OT: Better sleep with colored LEDs?
    ... Michael A. Terrell wrote: ... Excellent video. ... second through about 4.5 MHz of bandwidth in an analog channel is going to ... Don Klipstein ...
    (sci.electronics.design)
  • Re: Cheney on Meet the Press
    ... Michael A. Terrell wrote: ... An even more brilliant pun from the stalker. ... You really do have to fire that useless comedy writer ...
    (rec.crafts.metalworking)