Dynamic TV pictures
 

Mark Carver wrote:
NY wrote:

The only exception to this is some early sets from Japan (eg Hitachi)
which circumvented a patent by using an inferior decoder at the TV
which didn't apply such good correction.

The early PAL Japanese sets had the hue control to circumvent the PAL
patent.
Every other line was stored in a delay line, but instead of, as per the
PAL spec, being used to combine and average out the previous and present
lines, turning a phase error into a less noticeable saturation change,
it was simply used to repeat the line again.
So any phase errors would have ended up with the wrong hue, (just like
NTSC) hence the hue control to manually adjust for 'best results'!

Happy days! Newly married, we were doing OU courses so had to have BBC2.
We bought a 13" Sony. It was £193. At the time I was earning £13 per
week as a schoolteacher and £30 at the weekend fixing aerials. I fixed a
UHF aerial on our chimney, on the mast of the 'proper' (VHF) aerial.
Bought some 8mm OD coax that had the inner in a hollow tube, kept in
place by a spiral of polythene 'string'. Every visitor was astonished by
the picture quality. The hue control always had to be at 3 o'clock.
Every evening after school we would watch telly, but we both always fell
asleep. Then we would wake, and feeling refreshed would have a cup of
tea and sex. Then we would do our marking, with the telly on so we had
something to think about. Then we would drink some Newcastle Brown and
go to bed, where we would have sex. In the morning we would have sex,
then go to school. On the days when our OU programmes were on we'd get
up to watch them. Usually they were on at 6am. There were no VCRs that
we could afford. After the programme the person whose programme it had
been would be wide awake, so that person would wake the partner and
demand sex. Exhausting times, but happy ones. I have fond memories of
that little Sony.

Bill

Dynamic TV pictures
 

"Bill Wright" wrote in message
...
Mark Carver wrote:
NY wrote:

The only exception to this is some early sets from Japan (eg Hitachi)
which circumvented a patent by using an inferior decoder at the TV which
didn't apply such good correction.

The early PAL Japanese sets had the hue control to circumvent the PAL
patent.
Every other line was stored in a delay line, but instead of, as per the
PAL spec, being used to combine and average out the previous and present
lines, turning a phase error into a less noticeable saturation change, it
was simply used to repeat the line again.
So any phase errors would have ended up with the wrong hue, (just like
NTSC) hence the hue control to manually adjust for 'best results'!

Happy days! Newly married, we were doing OU courses so had to have BBC2.
We bought a 13" Sony. It was £193. At the time I was earning £13 per week
as a schoolteacher and £30 at the weekend fixing aerials.

A bit of an extravagance as OU progs were all b/w in those days.

--
Max Demian

Dynamic TV pictures
 

On Sat, 02 Nov 2013 15:27:23 +0000, Bill Wright
wrote:

Stephen Wolstenholme wrote:

The only problem I notice is at the dark end of the range. The
contrast is too low to see details. The bright end seems much the same
as it was with analog TV.

Adjust the gamma?

Bill

There is no gamma control.

Steve

--
EasyNN-plus. Neural Networks plus. http://www.easynn.com
SwingNN. Forecast with Neural Networks. http://www.swingnn.com
JustNN. Just Neural Networks. http://www.justnn.com

Dynamic TV pictures
 

On Sat, 02 Nov 2013 20:22:30 +0000, Graham. wrote:

Eidophor Projectors anyone?

I worked on one when I was an apprentice about 50 years ago. It used a
layer of oil above the CRTs. The oil was sensitive to the electron
beam producing a charge. It was in the refurbish department but we
never managed to get it working very well. One of my responsibilities
was to get into work at 7AM to switch the thing on as it took hours to
warm up.

Steve

--
EasyNN-plus. Neural Networks plus. http://www.easynn.com
SwingNN. Forecast with Neural Networks. http://www.swingnn.com
JustNN. Just Neural Networks. http://www.justnn.com

Dynamic TV pictures
 

On Sat, 02 Nov 2013 19:24:10 +0000, Graham. wrote:

40 odd years ago I had an argument with a Canadian. His position was
that UK colour televisions were crap because they didn't have the
"hue" control he was used to back home.

In my experience, the quality of performance of domestic technology of
almost any sort is *inversely* related to the number of external
controls, even the ones the user claims to understand.

Rod.

Dynamic TV pictures
 

On Sat, 02 Nov 2013 17:33:30 +0000, Johny B Good
wrote:


The effect of of "dazzlingly bright" effects within a scene are
simply "Simulated" within the much narrower dynamic range of the
display (and transmission system).

In fact, I've seen this effect put to good use by games software
writers in the F1GP racing game with the Monaco GP racing circuit
where your driver's eye PoV suffers the effect of coming back into
daylight at the end of the tunnel stretch of the track.

I don't know about computer games, but I see an effect like the one
you describe on nearly every amateur video clip on Youtube. I thought
it was called "Auto Exposure".

Rod.

Dynamic TV pictures
 

On Sun, 03 Nov 2013 10:39:12 +0000, Roderick Stewart
wrote:

On Sat, 02 Nov 2013 19:24:10 +0000, Graham. wrote:

40 odd years ago I had an argument with a Canadian. His position was
that UK colour televisions were crap because they didn't have the
"hue" control he was used to back home.

In my experience, the quality of performance of domestic technology of
almost any sort is *inversely* related to the number of external
controls, even the ones the user claims to understand.

Rod.

"It's got USB, LSB, AM, RF Gain, AF gain..."

--
Graham.

%Profound_observation%

Dynamic TV pictures
 

On Sun, 03 Nov 2013 09:33:18 +0000, Stephen Wolstenholme
wrote:

On Sat, 02 Nov 2013 15:27:23 +0000, Bill Wright
wrote:

Stephen Wolstenholme wrote:

The only problem I notice is at the dark end of the range. The
contrast is too low to see details. The bright end seems much the same
as it was with analog TV.

Adjust the gamma?

Bill

There is no gamma control.

Steve

You'd be amazed what it has in "service mode".

--
Graham.

%Profound_observation%

Dynamic TV pictures
 

"Graham." wrote in message
...
On Sun, 03 Nov 2013 10:39:12 +0000, Roderick Stewart
wrote:

On Sat, 02 Nov 2013 19:24:10 +0000, Graham. wrote:

40 odd years ago I had an argument with a Canadian. His position was
that UK colour televisions were crap because they didn't have the
"hue" control he was used to back home.

In my experience, the quality of performance of domestic technology of
almost any sort is *inversely* related to the number of external
controls, even the ones the user claims to understand.

"It's got USB, LSB, AM, RF Gain, AF gain..."

Reaction, Luxembourg bandspread, BFO, overdrive, turbo-charger..

--
Max Demian

Dynamic TV pictures
 

Max Demian wrote:


A bit of an extravagance as OU progs were all b/w in those days.

I'd relied on second-hand tellys until then, mostly scrounged from
customers. But no-one would give away one of the new 625 sets, so we had
to buy. It would have been very short sighted to buy a new
black-and-white. Incidentally, we bought the set not long after we
bought our first house, which we furnished for a total of £30.

Bill