DE1943746B2 - DEVICE FOR TELEVISIONAL PLAYBACK OF FILM RECORDINGS - Google Patents

Description

c Period of film frame change. One recognizes ca * the three verti ^ eblcn ^ penodes to lana are through a minor foreshortening Sng weX Se "on the ring of a film, ^ brought. The shortening changes the original one

^^^ SrTbSSte LBclce Is in the A bezeicnne with Γ2 _{pu iode}

Diagram of the F1 g. ^ 2 ώβ circuit diagram ei ν

indicated ^{Like e} ™haben * ^ ₆ * Schalheit Tl land 2 kn ^ t ^ f ^ in

^ t

but at the te., the through the

still picture with the same brightness as the

to be able to play a running movie. A standing one

Image is particularly important when demonstrating teaching

filming is very often desired. So far it could only be with

projected with significantly reduced brightness.

Furthermore, the time required for the superstructures is no longer necessary

known projection method. The playback is

also possible in a bright room because of the brightness

of a television screen is very large and bright for a large screen

wedge and contrast also in a larger area 10 of FIG. 2 are B "tnche" «they °

are richly adjustable. ^^^ "STSS

The proposal according to the invention for the reproduction of small-format film recordings on the screen of televisions is based on

Laying of the light point scanning method in that the x ₅ and 2 ^^^ ^ f ^ _Uwne screen frequency is changed so that it is with the ger as the ^ «« tlauteeit ii oe ' _{d television}

Film image change frequency is an integer proportionality vertical direction on the Budscnirm α nis forms, and that for the duration of the switching time of the S ^erates · film no playback on the visible part of the Was the

Screen can be done, for which the electron beam corresponds _M follow, is increased not through the visible part of the screen repeated addition deflected or flyback period of the electron nenstrahls in the vertical direction. The technical changes in the television receiver ^, which are necessary for the reproduction of a film, 5 can be put out of operation by switching the television set to broadcast reception so that they do not interfere. The device according to the invention is also less expensive because of the fact that only a tilting part is required for the television picture tube and for the scanning tube operating with a low switch-off steering power. i ^ds ° F ⁿ ^ ^e ? dergabe movies, in part, "el 1 to J * substandard sync signals emanating from the synchronous over the entire impulse of any per se external transmitter that acts The 35 Fümes hardly ^ be used *. . ή ^!

The invention is explained below with reference to the m ^

the F i g. 1 to 3 illustrated diagrams explained in more detail. For illustration purposes, the description is based on the specific exemplary embodiment in which the device is designed for an 8 mm narrow film, and be! which lasts an image period '/, «s = 55.5 ms. The B.ld period is made up of a presentation time of approx. P 52 ms, during which the film image is still, and a 45 tang switching time of approx. 3.5 ms, during which a changeover is made from one film image to another. The times represent the values of commercially available projectors, from which the invention is based.

The vertical deflection frequency of a television set according to the CCIR standard is known to be 50 Hz, and a period accordingly lasts 20 ms. Be, a three-time scanning, ie three-time imaging of the grid on the scan tube dm film was a film image and even a piece of a following shot 55 times T ² image are scanned. Ernndungsgemaß ^ consideration is then he £ two handled at,

in larger YY ^ ^ _da _

_{d Bi} i _dsc Hirmes a proper TvXnan erfindungsgefür a portion of the switching of the screen _is ^ _{FTIR the} portion S with the rear _deflection LIMITATION on that the deflection is increased. ^ _bt

ve

^^ ^ _3ΐ1ζεί1 o is in the fact that the electron beam becomes £ the switching time Tl , oe : _{ate age} -

β ^ suggestion too

^ ^ g _increase . trach Kn d ^ Vertkalabtaik ^ an ^ g _hneten

In the F1g 3 Bt m1 .ag s _AWenk _

Lime die »nubj ed. Un _ika , _{er Rich} .

voltage of the Elek ^ro "™ ¹¹ J _d " _{r F} j _g . 3 should die

^^ JJj ^ f / ffl? 2L just show ^ f J3. If this is visible ™ onenstr ™ _{then it is}

Gr "ze m the points IM * ^ _{so d ß er}

! EVERY part of the screen is cherished. S figures allow

üFriction of the electrical exercise «ch £ ^ ^

J _S 4 is _tbar , with the switching "increase the Ab

4 _ise, for example, the vertical

from the

the

speak. Out of context is straightforward

zS recognize whether z. B. the electron beam, η the Ab d, e

palpation tube, the Fenuahbildiohre or gle.chze.t.g in common to both tubes ».

ÜlSiS ^v

to he g, _deg

Around here the un ^ ^^ ^ _invention ä _ß

for synchronization on the transmitter side

5 6

use. This makes special genera unnecessary

gates for the generation of sync pulses that are interlaced with a still image. The up

known, among other things, very frequency-stable triggering capability is therefore in for a still image

must be leads. The shared use on the transmitter side is advantageously greater than in the case of a moving one

Synchronization impulses produce a picture that is just as calm as 5 film.

when receiving television broadcasts. In detail the derivation of the sync pulses from the film is drawn This part of the subject matter of the invention can be carried out in various ways from the fact that with the reproduction of a moving the. A simple method is, for example, Film and a single film frame the horizon- by the film drive an impeller Move talablenkstufe by the transmitter-side synchronous io, which rotates with the frame rate. the pulses is synchronized. The synchronization number of wings corresponds to the ratio the vertical deflection stage takes place during the reproduction of the vertical deflection frequency for film image change moving film by frequency of the film drive. In the present case, the impeller has initiated impulses and when playing a one-three wing. The impeller interrupts one at a time individual film image through the transmitter-side synchronous 15 optoelectronic receiver falling luminous flux impulses. The switching required for this takes place three times during the duration of a film frame change automatically in a manner to be described. and so generates three pulses, if necessary The synchronization of the vertical deflection stage is converted into pulse shaper and amplifier stages the playback of a moving film has nothing to do with it.

Interlace, as there is no coupling between the ao. Each pulse synchronizes the vertical deflection transmitter Synchronization pulses for the horizontal stage, so that automatically during a film image deflection stage and the alternate phase-locked three-time Verti-sync pulses derived from the film drive for the vertical deflection stage bekalablenkang takes place. To get from the vertical deflection stage stands. In this case, there is no serious disadvantage to the synchronizing pulses on the transmitter side see, since a viewer to keep away from details in as, according to the invention, before the stage for can hardly concentrate on a moving film image. the transmitter-side synchronization impuise an electronic one When playing back a single film frame, a switch, for example a switching transistor, is set, (Freeze frame playback) the film drive is at a standstill, so it always blocks when the film drive is running that no sync pulses for the vertical and thereby generated the sync pulses, and the senlenkstufe be generated. 30 synchronous pulses from the other side are now automatically allowed to pass if the in a manner to be described, the film drive on the transmitter side is out of order. For this the electro-sync pulses effective. As in this case both niche switches with one of the sync pulses the horizontal deflection stage as well as the vertical deflection stage derived from the film drive e is controlled by the synchronizing pulses on the transmitter side.

1 sheet of drawings

Claims (10)

Claims based on the synchronizing pulses of the film antenna: DC voltage is switched and, in the absence of the synchronous pulses of the film antenna, the external 1. Device for playing back film recordings allows synchronous pulses to pass through,
recorded, especially cine film recordings, on 5 the screen of a television set with the help a scanning tube, which points to the film on the radar the television set images synchronous raster, and light-sensitive elements for conversion The invention relates to a device Stromes in elektrsiche, the television receiver part for the playback of small format film recordings, supplied signals, characterized in particular from cine recordings on the images e t that the screen frequency (vertical deflection screens of television sets quenz) is changed so that it is suitable for both black and white with the film device frame rate an integer ratio 15 also for color reproduction on black and white telephoto images and for the duration of the switching time (T 2) of the viewing devices or color television sets. The invention The film does not reproduce the film on which the known light point scanning method is visible Part of the screen is done. found in which the grid of a so-called ab- 2. Device according to claim 1, characterized ge probe tube shown on the film and characterized by that for the reproduction of an ao let light through light-sensitive elements in 8 mm narrow film is converted to electrical signals with a film image change. The vertical deflection frequency of 18 frames / s The reproduction of narrow films on the image made three times larger than the film screens of televisions has not yet been realized. frame rate. been light because it was expected that the effort 3. Device according to claim 1 and 2, characterized in that 25 would be extremely large for this. The cinema indicates that film scanning in studio technology can be known for film image reproduction for the duration of the switching time (T2) of the electrons can only be achieved with considerable effort, beam over the visible part of the screen The methods known and used there distracted beyond. are therefore unsuitable for the private sector. For 4. Device according to claim 1 and 2, there- 30 the motion picture scanning have essentially characterized in that three different procedures are enforced in the film again. There are would be the return duration of the electron beam which would be the scanning of a switching time on a storage tube (T2) is equivalent to. saved image that is for black and white playback 5. Device according to claim 1 to 4, characterized by it is relatively uncomplicated, but for one characterized that for the scanning tube and the 35 color display because of numerous coverage television picture tube a common tilting part is very expensive. The two others is seen. Procedures are based on the so-called light point 6. Device according to claim 1 to 4, characterized from scanning. In one case the film is contiguous, that for the scanning tube and the nuierlich, which on the one hand has the advantage that the TV picture tube separate tilting parts provided 40 stress on the film is low, on the other hand are synchronized between them. However, the effort involved in raster mapping is increased because 7. Device according to claim 1 to 6, characterized in that the grid and film move. characterized in that when the film is played back it is known that the grid is replaced by a horizontal deflection stage of the tilting part or the optical device shown twice to each Detect tilted parts by synchronizing pulses from an external 45 grid point. Less effort and Transmitter, which corresponds to the standard synchronous with jerky movement, like a projector, emits signals, takes place. work the arrangements called the 8. Device according to claim 1 to 6, characterized using high-speed switching mechanism. To the opposite of the characterized in that when playing a vertical blanking time longer switching time for the jerked back Film the synchronization of the vertical 50 wise movement of the film so that they shorten The deflection stage of the tilting part or the tilting parts is equal to the vertical blanking time, becomes a special one synchromeshes derived from the film drive mechanical and pneumatic arrangement for pulse takes place. used the film transport. For that as a demonstration time 9. Device according to claim 8, characterized in the period indicated during which a film image is visible indicates that the from the film drive is unwound, a piece of film from the supply reel is called Teten sync impulses are advanced by means of an impeller loop, which is activated during the indexing one to the ratio of the film from one on the take-up reel side Vertical deflection frequency to the frame rate lying vacuum chamber sucked in very quickly corresponding number of leaves for the under- and thus the switching time accordingly crime one on an optoelectronic pickup 60 ringert. catcher, for example a phototransistor, fall The object of the invention was to provide a single has lcenden luminous flux. to develop a more diversified facility in order to 10. Device according to claims 1 to 9, there would be, in particular narrow films on the image characterized in that the external synchronous screen of televisions to enable. The pre-impulses for vertical deflection of the vertical compartments of such a reproduction compared to the bislenkstufe via an electronic switch, both known playback are like that. that they are as techspielweise a switching transistor, which can be viewed as advances. as the. which is in the locked state by one from the special advantage is the possibility to see one