Latest / 70 80 / SETTANTAxOTTANTA: 1972. Arrivano i videodischi in vinile, ma per vedere un film occorre alzarsi dal divano otto volte

Transcript

SETTANTAxOTTANTA: 1972. Arrivano i videodischi in vinile, ma per vedere un film occorre alzarsi dal divano otto volte · 70 80

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  Tyler Reddick here from 2311 Racing. Another
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  Was she brave? She was tired, mostly. But she
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  Did she have to fight a dragon? Nope, she bought
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  it scary? Honey, it was as unscary as car buying
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  could be. Did the car have a sunroof? It did,
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  actually. Okay, good story. Car buying you'll
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  on... Delivery fees may apply. 7080 .it presents
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  70x80. Do you remember? A KVOX production. Welcome
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  to 70x80, the 7080 .it column that deepens the
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  themes of the portal. I'm with the journalist
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  Marco Barsotti. What are we talking about today?
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  Today we are talking about DVDs, but vinyl DVDs.
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  We all know DVDs, small digital discs that can
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  contain, for example, an entire film. But in
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  the 70s, before the war of formats between videocassettes,
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  another type of support was trying to find a
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  market. Let's talk about DVDs. Of the same size
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  as the 33 -round audio and totally analogous,
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  these would have had to invade the homes of the
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  final consumers together with a variety of content,
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  modern term that in the field of the image indicates
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  film, telefilm and videoclip. Today we will talk
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  about three generations of video discs, two that
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  see the light at the dawn of the 70s by BOGEN,
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  GMBH and RCA, very close to the classic vinyl
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  disc. The third was born at the end of the same
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  decade, it is the splendid LaserDisc, an analog
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  format that at first glance seems to be a huge
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  version of our digital DVD. Let's start with
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  that of the BOGEN, completely described by an
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  exhaustive article by Professor Marino Mariani,
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  founder of the 1970s. of the audiovisual magazine.
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  The professor was what would have been called
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  a visionary today. In the article, for example,
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  he explained that video recording, instead of
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  analog, was done through encoded pulses abbreviated
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  in PCM. In short, he was talking about the digital
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  disc with ten years in advance. But let's go
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  back to the Bogen disc. Born to be played by
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  a normal turntable, in the image of the cover
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  on the 7080 .it site, a dual 701, the system
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  provided a disc for half in vinyl, with so many
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  solos, The recording was magnetic and was housed
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  in the most peripheral part of the disc. In the
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  internal half there were the sockets used at
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  the very end to drive the reading arm towards
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  the center. Letting you enjoy great stereo entertainment
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  and movies on your TV tonight. Basic players
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  start at 2 .99. Buy the player now and get Rocky
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  III or Star Trek II or Dumbo free. replace the
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  traditional little head with a magnetic one equipped
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  with a bizarre lateral extension necessary to
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  follow the slopes. The most complex is to bring
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  the reading speed from 78 rpm, which was that
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  of the discs of the 30s, to 156 rpm, the double
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  hand calculator. Turning at 156 rpm, the disc
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  had an average peripheral speed of 2 .04 ms.
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  To make a comparison, the cassette music that
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  we all know works at 0 .047 ms or 4 .75 ms. 5,
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  if you want, centimeters per second, that is
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  50 times slower. All this allowed a duration
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  of 12 minutes per facade. Again with our calculator
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  we can easily recall that a short film would
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  have needed four discs and since these were listed
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  on both facades, the head of the family or the
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  unfortunate person in charge of the family to
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  turn the disc would have had to get up from the
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  sofa an average of 8 times for a normal 90 -minute
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  feature film. No wonder, then, of the failed
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  success of the system, which leads us the one
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  developed by the RCA of the official name CED,
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  but commonly called Videodisco. The supporter
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  had seen the beginning of the development even
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  in 1964. Unlike the first, the RCA disc was partially
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  in vinyls but not a simple layer, as in the communities
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  of Entrategiri. The need to record the video
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  also forced the RCA to use mixed PVC with carbon
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  to make it conductive. Introducing the RCA Videodisc
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  Player, the extraordinary machine that plays
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  records you The duration was almost reasonable,
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  60 minutes per facade, so most of the films needed
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  a single disc and in fact the system managed
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  to make itself discreetly sellable. We are talking
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  about 100 ,000 readers sold in the first years
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  of commercialization, that is in 1981. As I said,
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  120 minutes are enough for most of the films,
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  but not all. In dedicated forums you can find
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  testimonials of enthusiasts who demonstrate how
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  to make us stay in the feature films of the higher
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  duration, the majors often decided to arbitrarily
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  cut scenes or in a case even to speed up some,
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  despite the protection, the dust still managed
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  to insinuate itself in the crevices. The result
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  was similar to that of the classic disco that
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  is enchanted. with the difference that, instead
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  of hearing the same segment of musical piece
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  repeated at the end, they obtained an original
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  broken image effect while the actors continued
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  to repeat the same action at the end. With a
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  method similar to that perfected by Flipper's
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  players, a nice twist on the reader solved the
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  situation. The late commercialization of the
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  RCA record, as we have seen almost two decades
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  after the expected date, caused it to die prematurely.
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  Let's close with the wonderful LaserDisc. To
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  make it understand the size, we photographed
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  it, the photo is always present on the site 7080
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  .it, next to a normal DVD. It is an optical disc,
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  where reading does not happen with magnetic heads,
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  but with a laser beam. The size, 30 cm, appears
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  to be that of a vinyl, 33 rounds, but with the
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  hole in the middle large, like that of a 45 round,
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  and obviously the surface is golden and reflective
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  of the light. Both faces were usable, but it
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  was not easy to explain to consumers the maximum
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  duration of the system or in fact it is necessary
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  to make the user understand first that any rotating
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  disc, therefore not only video discs, is characterized
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  by two speeds, the angular one and the peripheral
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  one. In the CAV system, Constant Angular Velocity,
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  the duration is 30 minutes per side, as in that
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  of RCA, where the handicapped head of the family
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  had to get up from the sofa an average of four
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  times per film. We talked about angular speed,
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  the second is called peripheral speed and it
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  is the one seen from the reading head. function
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  of the distance from the center of the disk the
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  more you go to the edges the more it grows look
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  at this vector in this position the module of
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  this vector does not change but the direction
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  and the verse of this vector that what are they
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  doing the speed of flow is equal to 4 .71 meters
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  per second the double of the bogen disk with
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  which we have opened it is 100 times more than
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  that of a set music keeping this speed constant
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  and therefore varying that of the rotation of
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  the disk we get a duration of Hey, it's Cole
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  Swindell. After I give everything I've got to
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  land a perfect vocal, I usually take five before
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  jumping into the next track. And I've learned
• 7:46
  exactly how to recharge in that time. Some folks
• 7:49
  grab coffee. I hit a quick good luck spin. Next
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