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Orchid XP v7 wrote:
> I don't know about *sound*, but the picture on my monitor goes wobbly
> just before I recieve a text message or phone call.
We had a ham radio operator up the street you could hear talking through
the electric organ (as in, piano-like musical device) we had. We
complained, but managed to convince him it was coming out the light
bulbs. Was very amusing.
--
Darren New / San Diego, CA, USA (PST)
Remember the good old days, when we
used to complain about cryptography
being export-restricted?
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47192dff$1@news.povray.org...
> Orchid XP v7 wrote:
>> I don't know about *sound*, but the picture on my monitor goes wobbly
>> just before I recieve a text message or phone call.
>
> We had a ham radio operator up the street you could hear talking through
> the electric organ (as in, piano-like musical device) we had. We
> complained, but managed to convince him it was coming out the light bulbs.
> Was very amusing.
>
> --
LOL
I was sound engineer for a open air festival in the early 80's.
The mixing desk was a cheap one with unbalanced line outs (i.e. very
sensitive to electro-magnetic fields)
During the sound check I heard a very clear and loud voice coming out of
the stage monitors :
"Hey dude I'm hearing myself speaking thru a PA! that's so funny!"
I didn't thought it was, so I ran across the street and told to the driver
chatting thru his CB to go and play some miles away.
Marc
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Darren New wrote:
> We had a ham radio operator up the street you could hear talking through
> the electric organ (as in, piano-like musical device) we had. We
> complained, but managed to convince him it was coming out the light
> bulbs. Was very amusing.
Down the road there's a guy with an arial bigger than his house. (It
even rotates from time to time.) Back when I had that cheap portable
stereo, I used to be able to hear muted mumblings through the speakers
while it was plugged in [but not necessarily turned on]. Very annoying.
Especially annoying when you realise you've actually recorded it on that
tape you did the other day...
[This is the same stereo that was rated at "20 W", but when we took it
apart to fix something, we found the speaker drivers were cheap little
things from Maplin or something. Two had "0.25 W" printed on them, and
the other two (the bass drivers) had "0.5 W" printed on them.]
Speaking of light bulbs... I recall one time at school, I walked into a
room, and there was a small group of kids staring at the ceiling. I'm
like "WTH? Is this the most exciting thing going?" And they're all like
"no, no, come over here and LISTEN!"
It turns out the light bulb was making a weird sound, like
WAB WAAB WAB WAHAHAHAB WALALALAAAAA WALALL WAAAAB AB WABALALAL...
And then suddenly, as we watched it, the pitch suddenly changed, and the
light slowly faded to black, and went out, and the noise stopped.
I've seen bulbs pop before, but THAT was just weird!
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Orchid XP v7 <voi### [at] dev null> wrote:
>> Speaking of light bulbs... I recall one time at school, I walked into a
> room, and there was a small group of kids staring at the ceiling. I'm
> like "WTH? Is this the most exciting thing going?" And they're all like
> "no, no, come over here and LISTEN!"
>
> It turns out the light bulb was making a weird sound, like
>
> WAB WAAB WAB WAHAHAHAB WALALALAAAAA WALALL WAAAAB AB WABALALAL...
>
> And then suddenly, as we watched it, the pitch suddenly changed, and the
> light slowly faded to black, and went out, and the noise stopped.
>
> I've seen bulbs pop before, but THAT was just weird!
Don't worry it goes away with age :)
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And lo on Sat, 20 Oct 2007 09:15:39 +0100, Orchid XP v7 <voi### [at] devnull>
did spake, saying:
> Darren New wrote:
>
> Speaking of light bulbs... I recall one time at school, I walked into a
> room, and there was a small group of kids staring at the ceiling. I'm
> like "WTH? Is this the most exciting thing going?" And they're all like
> "no, no, come over here and LISTEN!"
>
> It turns out the light bulb was making a weird sound, like
>
> WAB WAAB WAB WAHAHAHAB WALALALAAAAA WALALL WAAAAB AB WABALALAL...
>
> And then suddenly, as we watched it, the pitch suddenly changed, and the
> light slowly faded to black, and went out, and the noise stopped.
>
> I've seen bulbs pop before, but THAT was just weird!
Not bulbs, but I know the tubes hum seem to increase in pitch and they
start flickering before they go. I spot it more often in shops (prevalence
of such lights), but the wierd thing if I point it out to someone or a
sales guy they just get a blank look. If it was all of the lights doing it
I'd say it was me, but it's just some. Oh and for some reason the flicker
shows up more in reflecting light, browsing one section of DVDs I had to
stop as it was like a strobe effect.
Anyone else with the same thing or should I just submit myself to the
nearest lab for scientific study and dissection :-)
--
Phil Cook
--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com
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> Not bulbs, but I know the tubes hum seem to increase in pitch and they
> start flickering before they go. I spot it more often in shops (prevalence
> of such lights), but the wierd thing if I point it out to someone or a
> sales guy they just get a blank look. If it was all of the lights doing it
> I'd say it was me, but it's just some. Oh and for some reason the flicker
> shows up more in reflecting light, browsing one section of DVDs I had to
> stop as it was like a strobe effect.
>
> Anyone else with the same thing or should I just submit myself to the
> nearest lab for scientific study and dissection :-)
Yeh, I think your eye is more sensitive to flicker away from the centre
high-resolution bit. Often on my gf's parents old CRT (the only one I ever
use nowadays) I can see it flicker out of the corner of my eye when
displaying a whitish image (eg google website), but when I stare directly at
it it looks fine.
Also, as I understand, the amount of flicker visible varies quite a lot
person to person. What you see as annoying flicker someone else might not
even notice.
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And lo on Mon, 22 Oct 2007 11:14:05 +0100, scott <sco### [at] laptopcom> did
spake, saying:
>> Not bulbs, but I know the tubes hum seem to increase in pitch and they
>> start flickering before they go. I spot it more often in shops
>> (prevalence of such lights), but the wierd thing if I point it out to
>> someone or a sales guy they just get a blank look. If it was all of the
>> lights doing it I'd say it was me, but it's just some. Oh and for some
>> reason the flicker shows up more in reflecting light, browsing one
>> section of DVDs I had to stop as it was like a strobe effect.
>>
>> Anyone else with the same thing or should I just submit myself to the
>> nearest lab for scientific study and dissection :-)
>
> Yeh, I think your eye is more sensitive to flicker away from the centre
> high-resolution bit. Often on my gf's parents old CRT (the only one I
> ever use nowadays) I can see it flicker out of the corner of my eye when
> displaying a whitish image (eg google website), but when I stare
> directly at it it looks fine.
CRT-wise I generally need to run at 72Hz or higher; LCDs I can get away
with 60Hz, but I get this odd 'sensation' in my eyes/head that something's
not quite right. CRT TVs at 50Hz are okay at a distance and for short
periods of time, but as I've mentioned the LCD ones just do my head in.
Heh all sounds totally contradictory, but that's how I see things not as
if I can take my complaints to the designer.
> Also, as I understand, the amount of flicker visible varies quite a lot
> person to person. What you see as annoying flicker someone else might
> not even notice.
Just odd I've not bumped into anyone else with the same ability. Oo no I
tell a lie there was a girl with similiar abilities, less on the flicker
more on the tone and feeling things like TVs being turned on and off.
--
Phil Cook
--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com
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> CRT-wise I generally need to run at 72Hz or higher;
I think that's about average from my limited sample size :-) For me, even
at 72/75Hz, when showing large white areas I can see the flicker. I used to
have mine set at 85 IIRC.
> LCDs I can get away with 60Hz, but I get this odd 'sensation' in my
> eyes/head that something's not quite right.
Is that with all LCDs? Although light output from LCD remains virtually
constant during a frame, badly designed/adjusted LCDs can have slightly
different brightnesses between odd and even frames. This is because the
average voltage needs to be 0V across LC otherwise bad things happen, you
get around this by applying (eg) 4V one frame, -4V next frame, then 4V, etc.
Usually each horizontal line is driven with opposite polarity, so even if
there is some small difference it averages out spatially each frame. Even
better LCDs drive each pixel with opposite polarity (in a checkerboard
pattern) so it is virtually impossible to notice any flicker even when the
+/- are matched very badly.
Standard test patterns we use here are black/white horizontal lines and 1
pixel checkerboard patterns, these highlight any problems that would
otherwise be disguised with areas of plain colour. Maybe give it a try?
> CRT TVs at 50Hz are okay at a distance and for short periods of time, but
> as I've mentioned the LCD ones just do my head in. Heh all sounds totally
> contradictory, but that's how I see things not as if I can take my
> complaints to the designer.
You can tell me :-) Do you have the problems with LCD with static images
too, or is it just moving pictures?
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And lo on Mon, 22 Oct 2007 12:08:30 +0100, scott <sco### [at] laptopcom> did
spake, saying:
>> CRT-wise I generally need to run at 72Hz or higher;
>
> I think that's about average from my limited sample size :-) For me,
> even at 72/75Hz, when showing large white areas I can see the flicker.
> I used to have mine set at 85 IIRC.
>
>> LCDs I can get away with 60Hz, but I get this odd 'sensation' in my
>> eyes/head that something's not quite right.
>
> Is that with all LCDs? Although light output from LCD remains virtually
> constant during a frame, badly designed/adjusted LCDs can have slightly
> different brightnesses between odd and even frames. This is because the
> average voltage needs to be 0V across LC otherwise bad things happen,
> you get around this by applying (eg) 4V one frame, -4V next frame, then
> 4V, etc. Usually each horizontal line is driven with opposite polarity,
> so even if there is some small difference it averages out spatially each
> frame. Even better LCDs drive each pixel with opposite polarity (in a
> checkerboard pattern) so it is virtually impossible to notice any
> flicker even when the +/- are matched very badly.
>
> Standard test patterns we use here are black/white horizontal lines and
> 1 pixel checkerboard patterns, these highlight any problems that would
> otherwise be disguised with areas of plain colour. Maybe give it a try?
>
>> CRT TVs at 50Hz are okay at a distance and for short periods of time,
>> but as I've mentioned the LCD ones just do my head in. Heh all sounds
>> totally contradictory, but that's how I see things not as if I can
>> take my complaints to the designer.
>
> You can tell me :-) Do you have the problems with LCD with static
> images too, or is it just moving pictures?
Not something I've exactly made a scientific test of ;-) Anyway hmm
thinking about it 'name' brand LCD seem better then no-namers. TV-wise
both static and moving, but moving more so.
--
Phil Cook
--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com
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"Phil Cook" <phi### [at] nospamrocainfreeservecouk> wrote:
>
> Not bulbs, but I know the tubes hum seem to increase in pitch and they
> start flickering before they go. I spot it more often in shops (prevalence
> of such lights), but the wierd thing if I point it out to someone or a
> sales guy they just get a blank look. If it was all of the lights doing it
> I'd say it was me, but it's just some. Oh and for some reason the flicker
> shows up more in reflecting light, browsing one section of DVDs I had to
> stop as it was like a strobe effect.
>
> Anyone else with the same thing or should I just submit myself to the
> nearest lab for scientific study and dissection :-)
>
> --
> Phil Cook
You probably see it using your peripheral vision as we have groups of cells
in that area, which act as motion detectors. The flickering excites them
and draws your attention to them. Then you can see nothing amiss.
Stephen
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