Vinyl to Digital
in [UK Mac]
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From: Peter Ceresole on 16 Mar 2010 04:08 Rowland McDonnell <real-address-in-sig(a)flur.bltigibbet.invalid> wrote: > If the digits are a poor model of the original signal, as can be the > case if the job of digitising's done badly, you'd be getting no > degradation of a signal that was badly degraded by the digitising > process. That problem is common enough. I was explicitly referring to Digibeta cameras, which cost a huge amount and are professional kit, properly designed, as is everything at that stage of the process. So the results are very good. As for one of your other points, with standards conversion; in the analogue days it used to be a dog's dinner, utterly awful. Since the digital picture chain arrived, it got better even if not perfect, and has since improved hugely (digitally) to the extent that you can even hire an NTSC crew in the States, and get a decent result. -- Peter
From: T i m on 16 Mar 2010 04:42 On Tue, 16 Mar 2010 00:30:02 +0000, real-address-in-sig(a)flur.bltigibbet.invalid (Rowland McDonnell) wrote: >T i m <news(a)spaced.me.uk> wrote: > >> Ian McCall <ian(a)eruvia.org> wrote: >[snip] >> >That said, I have a 28" CRT upstairs with none of these problems, and a >> >20" CRT in the arcade machine that also has none of these problems. >> >Indeed, the multisync nature of the 20" arcade monitor is a revelation, >> >making even 320x128 graphics look superb at that size. >> >> I think displays are like tyres ... they all look similar but it's >> only when you use them hard do you notice the real difference. ;-) > >1993, IIRC, and I saw a demo of what TI called its digital micromirror >array projector video display (re-branded digital light processing >since). I had one of the big 3 crt projectors here for a while but it was just too big to even play with in this small house. Which was a shame apparently because (I think I remember) that solution being less expensive to run from a consumables POV than any high_powered and expensive lamp type also about at the time (not sure what they use now). > >`Use it hard' - but how, when I'm just sat watching a demo? Well, I >could move my eyes. And I saw colour separation - single-beam >projector, displayed RGB time sequentially, and eye movement was enough >to make the colours visibly separate. Then in this case, moving your eyes was enough to tip the process over the edge of good function, for you. For the technology I was citing, using it 'hard' would be fast panning scenes. Not that was particularly hard for the cameraman, an analogue TV or us to view but for (some) digital kit apparently. > >From what the engineers said to me afterwards, it was at the time one of >their bugbears, that problem. They wondered who'd put me up to asking >that particular awkward question - didn't seem hugely surprised when I >told 'em I'd spotted it all on my lonesome (so did a manager ask them to >ask the question?) You never know when a totally innocent observation can drop someone right in the poo. "Ere, did I see your Husband out with your daughter yesterday? ..." > >(There are ways to alleviate the problem, which doesn't exist in the >expensive three beam rigs used for cinema projection. It's just that >they hadn't got it sorted and I've always wondered about the problem >they /didn't/ mention which had caused them to have failed to get the >problem I saw sorted out - but that was an early demo, over 15 years >back.) Talking of demos. Whilst working for Kodak (Microfiche/film support tech) I was invited (by mistake probably) to some marketing champers, nibbles and a very clever 'video' presentation produced by (interestingly for me considering) a wall of Kodak Carousel slide projectors. The presentation was run to music and seemed to go on for much longer than I imagined something running from that hardware might. I always find that sort of thing interesting, when things are made to do what they were never designed to do ... like the 48V / 4 motor (normally 12V and one) Sinclair C5 or even jet powered cycles and stuff. ;-) Cheers, T i m
From: T i m on 16 Mar 2010 05:00 On Mon, 15 Mar 2010 14:02:34 +0000, peter(a)cara.demon.co.uk (Peter Ceresole) wrote: >T i m <news(a)spaced.me.uk> wrote: > >> Sounds very much what I 'hear' 24/7 via my tinnitus. > >Oh yes. Except that tinnitus is quite a bit louder. And rather lower >frequency centred, whitish noise. Is that your tinnitus then? Mine is pretty well the frequency of said CRTs and dog whistles etc and a real whistle (not buzz, white noise, whoosh or rushing sound). > >Although mine is at what I am told is quite a high level, it doesn't >bother me. You are a lucky man. Sitting her in the quiet it's as loud as my pecking on this Apple keyboard and louder than any other noise coming from the world in general. In fact, any noise loud enough to fully mask it would actually make the tinnius worse (and take 'days' to subside). > Apparently it's not so much that some people have worse >tinnitus than others (although clearly some do) but that people's >*tolerance* for tinnitus varies widely. Makes sense and proven by the fact that I can sometimes be distracted from it by stuff. However, it makes reading difficult ... or when you want a bit of quiet to concentrate on something in the tinnitus wades to distract you. I guess it's like having kids running around the house making a noise, all fine and dandy till the day you have a migraine. ;-( > My tolerance is high; others, I >was told, would be driven crazy by the same level. So it's a metter of >luck. Tell me about it. It's also a fine line (for me) to manage. Like, if I wear very good ear plugs when on my motorbike (I had a pair made by an audiologist), all I can hear is the tinnitus. Wear less effective ear plugs and background nose can help to distract from the tinnitus but then suffer the risk of aggravating it. In spite of this my hearing is still reasonable so when camping (where I might be woken by any / all the extraneous noises going on out there) I often take a sedative (Special Brew, Tennants Super or some other tramp juice etc) or wear some earphones plugged into a radio, set off-station (for the white noise). > >> > When the Beeb switched picture to another source (say a >> >studio to an OB) and you lost picture for maybe a frame, you could >> >actually hear it more easily than you saw it. >> >> I wonder if that was ever used as a diagnostic tool? > >Nah. It was always a bloody nuisance... But the general noise level in a >gallery or a tech area (mostly fans and spoken instructions- 'camera >three, five next, stand by Kempton OB, run telecine') was far too high >to use line scan noise as much of an indicator. Ah, ok. Cheers, T i m
From: Geoff Berrow on 16 Mar 2010 05:13 On Tue, 16 Mar 2010 09:00:15 +0000, T i m <news(a)spaced.me.uk> wrote: >>Oh yes. Except that tinnitus is quite a bit louder. And rather lower >>frequency centred, whitish noise. > >Is that your tinnitus then? > >Mine is pretty well the frequency of said CRTs and dog whistles etc >and a real whistle (not buzz, white noise, whoosh or rushing sound). Mine too, with most of it coming from my left ear which is profoundly deaf. Has anyone here /not/ got it? :-} -- Geoff Berrow (Put thecat out to email) It's only Usenet, no one dies. My opinions, not the committee's, mine. Simple RFDs www.4theweb.co.uk/rfdmaker
From: Geoff Berrow on 16 Mar 2010 05:19
On Tue, 16 Mar 2010 08:42:36 +0000, T i m <news(a)spaced.me.uk> wrote: >Talking of demos. Whilst working for Kodak (Microfiche/film support >tech) I was invited (by mistake probably) to some marketing champers, >nibbles and a very clever 'video' presentation produced by >(interestingly for me considering) a wall of Kodak Carousel slide >projectors. The presentation was run to music and seemed to go on for >much longer than I imagined something running from that hardware >might. I used to make shows like that. They were sequenced from a clock track on the (usually) 4 track tape deck. Biggest show I ever did used 18 projectors on 6 screens. Great fun and remarkable image quality under the right conditions. -- Geoff Berrow (Put thecat out to email) It's only Usenet, no one dies. My opinions, not the committee's, mine. Simple RFDs www.4theweb.co.uk/rfdmaker |