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Old 10-03-2012, 03:00 PM   #13681
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and i have a flat screen CRT in my basement.
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Old 10-03-2012, 03:02 PM   #13682
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It never bothered me, but I'm curious what it is exactly that I'm hearing.
Yeah, I sometimes hear this on single-tube NTSC sets.

What you're hearing is the flyback transformer.

Remember that the path of the electron beam is steered across the screen by two sets of deflection coils which are wrapped around the yoke (neck) of the tube. They produce an electromagnetic field which pushes and pulls the beam around to make it move across the screen.

The horizontal scan occurs at a fairly high rate. On a standard NTSC TV, the beam has to scan from left to right 15,735 times per second: 525 lines x 29.97 frames per second. (This is from whence derives the old 15.75 Khz timing standard. Back in the B&W era it was in fact 15.75, because the framerate was 30 FPS instead of 29.97.)

Because the horizontal coil has to do its work at such an extremely high rate of speed, and in particular the part where it has to whip back to the other side of the screen almost instantaneously at the end of each visible scanline, it requires an extremely large amount of energy to drive.

The flyback transformer is used to generate this energy. It is driven by a sawtooth wave (slow ramp up represents the visible scan, sharp ramp down represents the beam flipping back to the other end of the screen). It is the nature of transformers in general to exhibit mechanical vibration in sympathy with their operating frequency. With small transformers this effect is so tiny as to be inaudible, but I'm sure everyone has been outside near a very large AC mains transformer and has heard it growling along at 60 Hz. The flyback transformer does exactly the same thing, but at 15.75 Khz instead of 60 Hz.

Further reading:
Flyback transformer - Wikipedia, the free encyclopedia
flyback transformers secrets and tips
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Old 10-03-2012, 03:16 PM   #13683
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CRT Stuff

I have a ~2006 model RCA D56W20 1080i CRT in my bedroom, and I'm really not thrilled with it. Convergence is a maddening 25 or 169 (!) point procedure. Detail still kind of sucks afterward, especially near the edges of the screen, and even more especially with whites and bright colors, making that the white text on the HUD of Call Of Duty all but illegible.

The poor thing has been moved half a dozen times, which doesn't help I'm sure, but that's pretty much the state of any HD CRT TV you're going to find these days. I would gladly trade mine for a 50ish inch LCD that didn't make 'in the know' TV guys happy.
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Old 10-03-2012, 03:24 PM   #13684
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I love when mines in 4:3 mode and the black bars on the side bow out like your mom's fat belly.
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Old 10-03-2012, 04:36 PM   #13685
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Old 10-03-2012, 05:18 PM   #13686
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Ok, so this link is NSFW

its the redband trailer for movie 43. If you dont know what a redband trailer is, you'll probably be offended by it.

For the rest of us straight people, enjoy.

"Movie 43" | Movie Trailer | MTV
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Old 10-03-2012, 05:27 PM   #13687
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Old 10-03-2012, 05:44 PM   #13688
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Quote:
Originally Posted by vehicular View Post
I have a ~2006 model RCA D56W20 1080i CRT in my bedroom, and I'm really not thrilled with it. Convergence is a maddening 25 or 169 (!) point procedure. Detail still kind of sucks afterward, especially near the edges of the screen, and even more especially with whites and bright colors, making that the white text on the HUD of Call Of Duty all but illegible.
Oh, yeah. Mine does exactly the same thing. The convergance procedure on the Toshiba Theaterview set is only 18 steps (9 points, once each for red and blue) and afterwards, I always get some kind of chromatic seperation where there is white text starkly superimposed over a darker background at the extreme edges of the screen.

In my case, however, I use my TV mostly for watching TV, and not for playing videogames. With the exception of the credits, such material does not contain picture elements which reveal this flaw. The human eye is amazingly sensative to luminance information, and at the same time amazingly insensative to chroma information. Did you know, for instance, that most of the consumer analog videotape formats of the 80s and 90s had an effective chroma resolution of less than 50 lines? When viewed on a vectorscope they looked like absolute garbage, but the human eye and brain are miraculous devices which are capable of filling in the missing detail based on the available luma information and our intuative uderstanding of what things are "supposed" to look like.

If I were a "serious console gamer" then I am sure I would vastly prefer an LCD display. The very things which make LCDs unsitable for use with normal video are totally irrelevant to gaming use with an uncompressed digital video interconnection. Likewise, the features which make an analog CRT such as mine most suitable for video presentation are of little concern in a gaming application, where the source is completely free of noise, is of exactly the same resolution as the display, and does not contain film-originated fluid motion in a way that inter-frame motion interpolators could create objectional artifacts from it.

Two totally different applications, two totally different "ideal" display technologies.


Would you like to trade your RCA for a Plasma of the same size?
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Old 10-03-2012, 07:24 PM   #13689
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Old 10-03-2012, 08:45 PM   #13690
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I've always wondered if the soap opera mode effect was partly due to a linear algorithm. When people walk, it is in a parabolic movement, so a linear interpolation may not be accurate. Now, if they took 3 frames and created a curve based on that, maybe it would look more natural? I mean, when I look out the window at people walking around, it doesn't look like it does on a TV with the interpolation turned on. There is also going to be a motion blur on each frame from the source media. I'm guessing it would look much different if a movie was recorded at 120fps.

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Old 10-03-2012, 08:45 PM   #13691
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I've always wondered if the soap opera mode effect was partly due to a linear algorithm. When people walk, it is in a parabolic movement, so a linear interpolation may not be accurate. Now, if they took 3 frames and created a curve based on that, maybe it would look more natural? I mean, when I look out the window at people walking around, it doesn't look like it does on a TV with the interpolation turned on. There is also going to be a motion blur on each frame from the source media. I'm guessing it would look much different if a movie was recorded at 120fps.

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Old 10-03-2012, 09:31 PM   #13692
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Old 10-03-2012, 09:58 PM   #13693
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tl;dw
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Old 10-03-2012, 10:45 PM   #13694
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Old 10-03-2012, 11:14 PM   #13695
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It looks like another bear. That looks like the head right there.
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Old 10-03-2012, 11:16 PM   #13696
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I heard the dead body sing "I am the walrus"...
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Old 10-04-2012, 12:18 AM   #13697
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It's a momma and her cubs. The cub on the right just has a big chunk of ice, probably licking blood and brains off of it... definitely a seal that was killed. I am the Polar Bear Whisperer.
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Old 10-04-2012, 12:43 AM   #13698
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It's a momma and her cubs. The cub on the right just has a big chunk of ice, probably licking blood and brains off of it... definitely a seal that was killed. I am the Polar Bear Whisperer.
yes, but do you want a coke?
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Old 10-04-2012, 12:50 AM   #13699
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Ok gotcha thought the ball of ice was a head.
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Old 10-04-2012, 02:06 AM   #13700
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