DE2315032A1 - PICTURE PLAYBACK DEVICE - Google Patents

Description

PAl E NT 4HWÄ), TE

H. LEINWEBER dipl-ing. H. ZIMMERMANN DIPPING. A. Gf. ν.WENGERSKY

8 Munich 2, Rosental 7, 2nd ed.

Part addr. Lelnpat Munich phone (0811) 2605989

Postal check account: Munich 22045

_the 26th

Unier sign

i - ^ - Lö'Joüiic. üijüC ± vau Ι ^ -ϋϋοι '^ Ιϋΐ GO. LL-u. , uaaka / Japan

vie i.rfindu% uses, based on an electronic viaeo- ^ ufseiclmunase: .nricntun ₆ (LVa-Linreicatung) "LBDaiüi'Ei ^ eiii ^ uf-calibrationnun ^ smaterial, on your successive rialbbilder aui ^ eze ± ü, iL £ ü & ind, on di.sv/aulvveise reproduction of these pictures as L ^ t _L xe oaer Etci.eude pictures, as well as on the alignment of the fields.

further advantages, features and characteristics of the invention ^ Γ ^ Θϋβϊ. ί -.:. οι. ? from the following description. On the drawing is: -. Ie ^ rfindun ^ shown for example and ^ v / ar soaps:

ii ^. 1 a Lraufsicüt on a known SV ^ -Filin,

ι · 1 _ο . 2 is a perspective view of part of the house of the known HV. _{i.-EinriCijtun>} = ',

/ iü. 5 is a view showing the known image performance of an Lv ^ film,

309842/0845

Fig. 4 is a view of a known device

Deriving a synchronous signal from the EVU FiIm, . '.

Fig. 5 is a view of the mutual arrangement of EVa film and scanning grid to explain the known äYu device,

i'ig. 6 is a perspective view showing the structure of a Tape recording material drive for use in a picture display device according to the invention,

7 is a schematic view for explaining an embodiment of the picture reproducing device according to the invention,

8 is a plan view of the known EVE film,.

9 is a plan view of a tape-shaped recording material according to the invention,

Fig. 10 is a plan view of a tape-shaped record; material according to the invention, and

11 is a plan view of a modified embodiment of the tape-shaped recording material according to the invention.

In the following, the known ¹ EVü device is described with reference to FIGS. 1 to 5.

The EVii device (electronic video recording device) is a device developed by the American company Columbia Broadcasting Corporation (CBS). According to this device, a television signal is recorded by means of an electron beam recording device (EBu) on a Recorded black and white film and used the recording as a hat negative for making copies; in the The film capacity contained in a cassette is displayed in a

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device is played and the reproduced black ¥ ice signal or VideofarD-Signai is used in an ordinary television receiver made visible.

Fii -,. 1 show a typical üV-u film. The film is £ 0.75 wide and has two parallel image recording tracks 1 and 2, which are arranged in sets. In track 1 aas luminance signal is recorded and in track 2 the chrominance or color signal, in a coded form suitable for nui zeicrmung and Iviedergsbe. A synchronizing signal track is provided between the two tracks, in which a transparent synchronizing signal marker 3 is recorded for each field. These markings serve as a vertical sync signal during the playback of the television picture. Magnetic recording tracks 4 for storing the audio signals are provided on the opposite sides of the film.

The ΙΛ / u movie thus constructed is played by adding is moved at a certain speed through a film drive of the playback device (i.e. in the HTSC system 60 Ealo frames per second and in the Jri-Jr system 50 fields per Second), whereby its surface is raster scanned with a light point scanning tube to achieve luminance and chrominance signals by photomultiplier.

Fig. 2 shows an embodiment for the film drive. In this embodiment, the ÜTu-Pilm 5 from its cassette 6 at a certain 'speed' by means of a Banö drive spindle 7 and a pressure roller 8 unwound and tuf a take-up reel 9 wound up. Mn Drive motor 10 drives the film drive. Its torque is transmitted to a flywheel 12 via an endless belt 11, around diesec and the associated Bandarittriebsürinde1 7 ifc rotation to set.

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Line with the flywheel 12 firmly connected stepper roller 13 drives a rubber roller 14 and also a lollipop roller 15 at. The rotation of the - roller 15 is via a key element 16 of the take-up reel 9 transmitted to set it in rotation. Due to the iieibelement 1b the film transport by simply stopping the rotation of the film cassette 6 and.release. Of the pressure roller 8 are stopped without daii the drive motor 10 needs to be switched off in the magnetic head 17 for reproducing the audio signals is in contact with the running film. ".

The field signals of the film are raster scanned by a light spot tube 18. A scanning raster area is thereby used 19 through converging lenses 20 and 21 and le flexions prisms 22 and 23 on a field area of the film focused. This creates a "vice" through the two lens-prism pairs thrown through onto two adjacent fields. The one falling through the respective fields Light is subjected to an intensity modulation depending on the luminance and chrominance signals. and to obtain corresponding electrical playback signals through optical guides 24 and 25 in photoelectrons-multiplier tubes-26 and 27 initiated.

To achieve the synchronous signal, light coming from a light source 28 is guided through an optical fiber 2 ^ onto the synchronous signal track. The light passing through the mark sync signal light is supplied as by an optical Syr.chronsignallicht Löhre 30 passes to a photoelectric] converter 31, ^Ζ · · Β a phototransistor, ro that it is read out as a synchronous signal. This synchronizing signal is used as a vertical synchronizing signal for the video signal and can be used just as well as a control signal for controlling the speed of the film run.

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In order to be able to read out the signals by scanning the film fields described above with a Lechteckraster, the screen size on the field area must be twice as large as the field in the field direction, ie you have to use the so-called "jumping scanning system", in which the scanning point follows the field just being scanned, the reason for the need for double the field length for the vertical raster amplitude is evident from FIG. The vertical deflection beginning at the upper part of the field 1, which is indicated with an arrow in the film position (a), reaches the lower part of the same field, which is also indicated with an arrow in the film position (b), after one frame period has elapsed.

In order to begin the vertical scanning of the next field, the scanning point must now go back to Jump position (c). Consequently, the vertical raster amplitude must be twice as long as the length of the field, i.e. the vertical scan speed must be twice the film speed.

For the sampling of the vertical sync signal, the sync mark is usually in one place provided, which is exactly one field length behind the assigned scanning raster, as shown in FIG is. Theoretically, it can be a whole multiple of the field length away from the truck. However, the bigger the , distance, however, the greater the likelihood that the synchronization due to elongation or shrinkage of the film or fluctuations in the sync signal frequency. place the sync mark exactly next to the assigned iiaster, then sicii also result in multiple difficulties, such as through the mechanical Construction-related limitations.

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Fig. 5 shows in detail the Hasterstellun ^ and the Position of the assigned synchronizing signal! Mark. 'At the same time the shaded area 33, which is delimited within the bold printed triangular half-image, is the diagram area which is twice as large as the frame length in the direction of film movement or vertical scanning direction. The assigned sync signal area is on the sync signal track an image length behind the! button. If the vertical deflection begins, if the vertical sync is in this relative arrangement then it is an accurate sample the fields possible.

The üvTi facility enables the above-described even reproduction of moving pictures and also has the advantage that any desired field can be stably reproduced as a still picture. Usually one obtains a still picture by stopping the film transport ^ and reduced the vertical grid size to half the size, which the Easter has while the film is running, i.e. the screen size corresponds to a length of a field, so that only a single field is scanned. At this point, the vertical sync signal is from a separate Frequency standard generated, e.g. an AC power line or also from a separate oscillator. Thereby, a single field can be reproduced as a still picture will. Now, however, the position of the field does not always match the position of the lasters or is not always precisely aligned in relation to it. In the event of a poor alignment, what is known as an uncaptured one would appear of the image arise which comprises two adjacent fields. The alignment of the fields is usually done while one looks at the reproduced, standing image through one made manually operable film transport mechanism.

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However, it is very tedious to find the position of the fields every time realign. to have to if a still picture is displayed should be, especially if you want to look at still pictures very often. Hence, it is desirable that see the position of the fields in each case automatically adjusts a still image.

The object of the invention is to provide an automatic post-L division of a signal field on an EVIi-FiIm as well as the projection of the light point scanning tube raster the film, if a still picture is reproduced with the EVii transfer device.

The image display device according to the invention has the particular advantage that optionally movable and still images from a tape-like recording material on which images in the form of successive fields are recorded, can be reproduced and that a simple and automatic field spacing can be achieved is.

The image display device according to the invention is shown below described with reference to FIGS. 6 to 11. FIG.

1. Face image adjustment mechanism according to the invention;

Fig. Β shows a field adjustment mechanism according to the invention. So far, as already described, the field adjustment has been achieved by operating a manual film transport mechanism; according to the invention, however, this is done by means of an auxiliary motor 35. The auxiliary motor 35 is put into operation by clutch when the playback mode (for the reproduction of moving images) is switched to the standing mode (for the reproduction of still images), and it is stopped by a field setting signal to be described below. The motor torque is transferred to a film cassette 6 through reduction gears 36 to 43.

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wear, which is driven thereby and 5-unwinds film. This mechanism is - as shown in the drawing - below the cassette corresponding to the cassette according to FIG 6 arranged. The torque transmission gears 41 and 42 sit on a lever 44 around the rotating shaft of gears 39 and 40 is rotatable. The gears 42 and 43 can by the pivoting movement of the lever 44 in or out of Mn handle can be brought together. The opposite of the gears 41 and 42 dead of the lever 44 carries a dip . core coil 45 and is biased by a spring 46. "At In playback mode, the plunger core coil is not fed or is kept active or in the operating state, so that the lever 44 assumes a position in which he due to the tensile force the spring 46 the gear 42 out of engagement with the gear _43 holds. When switching from playback mode to standing mode, the plunger core is coupled to the switching mode driven and causes a pivoting movement of the Lever 44 against the tensile force of the spring 46, so that the gears 42 and 43 are brought into engagement with one another. Consequently, the torque of the auxiliary motor 35 is increased to Transfer cassette 6. During the standing operation, the Plunger core coil 45 in the active or working state and the Pressure roller 8 at distance from the tape drive spindle 7 held. If playback is switched back to, the pressure roller 8 comes into engagement with the tape drive spindle 7 via the film 5 and unwinds the film at a predetermined speed. -

If, with the setup described, the field is not precisely aligned when switching on to standby mode, the film is driven by the auxiliary motor 35 at a suitable offset rate and at a suitable speed until the correct alignment of the field is determined; whereupon the auxiliary motor 35 from

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stops, .this way an automatic field adjustment can be achieved. At this point, the Film unwinding speed should not be too slow. The reduction ratio is such that the film oversize or the i. '' i line α tra vors chub due to the inertia based rotation of the auxiliary motor 35 after it is switched off is sufficiently low.

2. Method of obtaining a control signal for controlling the auxiliary motor.

The easiest and most practical way to achieve the field adjustment signal is that - as in playback mode - - a signal used by the vertical sync signal! mark is derived on the sync signal track. In other words, after switching to standing mode eier auxiliary motor 35 are switched off as soon as an output signal is received due to the aligned position between field synchronous windows or aperture and sync signal scanning position is present. However, if this method were applied directly, the reproduced still image would be reduced by exactly half a Field differ, as can be seen from FIG. 5. Fig. 5 shows that the film is stopped just when the Synchronizing signal sampling position 32 coincides with the synchronizing signal marking. At this point the itaster size is for the standing operation is reduced to half its size during playback operation, i.e. the sawtooth-shaped vertical scanning amplitude is reduced by half. That means, that the standing mode raster in the middle of the playback mode is arranged, as from the cross-shaded field surrounded by a dashed Ite-rectangle is apparent, so that the scanning extends over half of two adjacent fields. Consequently the reproduced field is deflected by the length of half a field.

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2a. First measure in the event of inaccurate alignment of a standing film half-frame opposite the master division.

A first measure to rule out inaccurate alignment can be that the position; des üasteijs on the light point tube by exactly half a ■ field length can be shifted in the vertical scanning direction. This can easily be done by applying a direct current or a direct voltage the required amplitude as direct current bias to the vertical deflection coil or the deflection electrode of the light spot tube. One can, too Let direct current flow through a Hi If sable nk yoke specially provided for the relocation. On this foeise'kann durojh Reduce the vertical raster amplitude to half the value given during playback operation and through Shifting the division of burden by half a picture length and at the same time as switching to standing mode, a static display of a precisely aligned field be achieved.

2 B. Second measure in the event of inaccurate alignment of a standing half-image in relation to the caster position.

This second measure consists in providing an additional synchronizing signal sampling device which corresponds to position 47 in FIG. In other words, a scanning device is provided for the smiley position of a standing film field, with which a synchronous signal scanning mark located at 47 is to be detected, that is, which is a distance of half a field length or any multiple thereof from the position of the Sampling mark 32 is arranged for the sync signal in playback mode. Corresponding to the synchronous signal scanning device provided at 32 are a light source 48, an optical fiber 49, an optical tube 50 and a photo-electrical converter 51, for example errrPhototransistor for "ttte"";

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additional scanning device arranged at 47 is provided. The output signal given by the scanner can be coupled with switching to steamer mode, see above It is only switched on during standing mode and switched off during playback mode. The auxiliary engine 35 can be switched off by this output signal. This means that even if the vertical raster amplitude is reduced by half when the film is detected when a sync mark is detected by the detection device is stopped according to position 47 - the field and the uaster according to the cross shading 34 according to FIG. 7 are aligned. In this way there is a still reproduction of a precisely aligned field achievable. In playback mode, the sync signal is derived from the sync signal marker in position 32. In this case too, the two light sources 28 and 48 can be replaced by a single common light source e.g. the light source 28. Kit In other words, the light coming from a common light source can pass through the respective optical fibers 29 and 49 are guided to the locking positions 32 and 47.

2c. JThird action to take if a is inaccurately aligned standing film half image opposite the aasterstellung.

In this third measure, which is a modification of the second measure described above, can on the synchro-signal scanning device for playback operation, as well as on the one assigned to it «= light source 28, the optical fiber 29, the optical tube 30 and the photoelectric Converter 31 can be dispensed with, rather the scanning device provided in position 47 is used alone both to generate the field adjustment signal at the time of standing operation and to increase the vertical

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Synchronization signal in playback mode. In this case it is however, the output pulse sampled as a vertical sync signal by a period corresponding to half the field length delayed, e.g. 1/60 χ 1/2 second in the case of a film speed of 60 fields per second, -and the delayed Signal is used as a sync signal to initiate caster scanning. Because the film speed in playback mode is constant, this corresponds to this delay time delayed signal to a synchronous signal derived in position 32, that is removed by half a field length from the scanning position of the non-delayed signal, so that an aligned image can be reproduced in playback mode.

With regard to the field adjustment at the time of switching from playback mode to standing mode, it should also be noted that the field alignment can also be achieved if the standing mode of a certain field is followed by a standing mode of the next field or a field that follows one or more fields later follows. In particular when standing, when the auxiliary motor 35 by the. the output signal originating from the synchronous signal marking is kept in the switched-off state, the motor 35 is switched on again by temporarily switching off the output signal by means of a manually operated switch provided for this purpose, in order to initiate the film transport. As a result, the output signal disappears from the sync mark. By actuating the switch again as soon as this condition occurs, the film is stopped again when the output signal from the synchronizing _{signal marking appears for the next field t} so that a permanent display of the next field is possible. If the switch is left in the switched-off state for a long time, the film can be trended over more than one field.

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VJie already described, is according to the invention for Time of the standing playback always automatically an aligned field achievable, so that the conventional laborious manual operation is no longer necessary; this is particularly advantageous when there are very frequent static images can be reproduced. With the mechanism according to the Srfindun it is also possible to record successive fields as still images, so that it is particularly advantageous when used as a search system for image-wise Check records should be used.

Although the above description is based on one direction, the same principles can apply can be applied to other devices for recording and reproducing fields, but those of the EVR device for reproducing moving and still images are similar.

3. Automation of the standing mode and the alignment of the half image «

G-emea of the above description is automatic Field alignment can be achieved if the user of the playback device is to show a still image selects desired moving field from a program. For teaching purposes in particular, however, it is advantageous if not only moving fields, but also Half-images to be reproduced as still images can be used accordingly in the program management and if the playback of moving images can be switched automatically to standing playback as soon as the field ei the standing image reaches the scanning position.

Ui-; such an automatic circuit and fieldsq tv .. ::.! work is usually done beforehand on the Special control signals, e.g. automatic shutdown, are recorded at the appropriate points in the recorded film, so that

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The operating status changes when such a signal is scanned of the playback device switches automatically. Fig. 8 shows a recording film with auto-stop signals. at In this film, the automatic shutdown signal consists of alternating black and white areas in a constant sequence, the recorded on the sync signal track. The black area In contrast to the white area, does not allow light to pass through, so that an output signal of a certain frequency can be determined by the synchronizing signal detector. Since the film speed is constant it is ensured that an output signal is obtained at a certain fixed frequency. This change signal is transferred to a suitable section in front of the assigned automatic shutdown signal field to be reproduced as a standing image recorded. If this alternating signal section following the normal moving field reaches the sync signal detector, it gives a signal of a certain frequency, so that due to the operation switching mechanism of the player is operated. However, this requires a frequency & discriminator, which complicates the setup of the facility.

A device is described below with which an automatic shutdown signal is generated in a very simple manner in the automatic switching and field alignment mechanism below Using two such synchronizing signal detection devices' can be made usable ... In the film, as shown in Fig. 9, additional sync marks 3 'are centered between the adjacent ordinary field sync marks 3 provided. In other words, there is a row of sync markers arranged whose distance from each other is exactly half the length of the field. These markings are used instead of the alternating signals 8 as an automatic shutdown signal.

nauf

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Two synchronous signal detectors are used to determine this signal series, which are spaced around a center-to-center distance are arranged from one another corresponding to half an image length or any multiple thereof. With this arrangement, an automatic shutdown mechanism can be operated when one of these two detectors output signals are issued at the same time.

The pattern of automatic shutdown signals according to FIG. 9 can be recorded and determined much more simply and easily than the alternating signal pattern according to ί'ίς ·. 8. Numerous effects can be achieved by using the automatic shutdown signal. In the former case, for example, it is necessary to record sync signals having the same shape as the ordinary sync marks on the center between adjacent marks, and according to the invention, it is not necessary to separately provide alternating signal patterns. _/ You don't need a frequency discriminator for scanning either, but a coincidence circuit with two inputs.

4. Automatic standing mode and field alignment without changing the itaster size.

Fig. 10 shows one of the films in which fields are recorded for automatic standing operation, which in the Opposite to. double the ordinary moving fields are as long as the usual fields in the vertical scanning direction, and a method of recording one Image in this Auto Standing Playback movie. This kind of field is used to move the still picture with the scanning raster in ordinary playback operation of moving Reproduce images. When playing back moving images, a jump scan is necessary because of the necessity of jumping the size of the scanning grid twice as large as

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the field size on the film in the vertical scanning direction. Accordingly, one should stand for an accurate reproduction the half-image without changing the size of the scanner half image have the same size as the scanning raster. the end this Qund must be the field for exclusive use have double the length of the moving normal field in the case of standing display.

J ¹ Ig * 11 shows a film in which the field for the automatic standing mode has the same size as the raster and the field for the moving picture. One of the greens for the fact that neither the size of the field for the autOQHfci

see standing on double the size of the field for that Moving image is increased, nor the process of ... contraction the scanning grid size is applied to half the size in standing mode, is that the contraction the scanning grid size- brake parts in the phosphor screen the light point scanning tube in the area of the contracted master. In other words, the brightness in the contracted, upper section becomes probable due to the deterioration of the screen at this point less than that in the rest of the phosphor screen. Is this If so, at the time of reproducing the moving images, the brightness is no longer uniform. this is also the case when a moving picture is displayed as a still picture. In this case, however, the The duration of the standing operation is usually relatively short. On the other hand, in the case of the automatic standing mode the still image field is often paused for a relatively long time to be explained and viewed closely so that the likelihood of burns is much greater and countermeasures are much more urgent must be taken. A second reason is that a field that is used exclusively as a still picture

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should be reproduced, a higher resolution is granted shall be. In a stationary picture, details are often more important than in a moving picture. Consequently, the playback of still images in the same master size used as for the reproduction of moving pictures, so that a deterioration in resolution is due to a contraction of the grid size is avoided.

The film of Fig. 11 is provided with synchronous signal marks for the automatic field alignment in the case of a reproduction of moving fields as still images, which are recorded on the synchronous signal track at positions which are from the center line of the scanning raster perpendicular to the vertical scanning direction by a distance which one half of the field length or any multiple thereof. These sync markers can also be used for automatic field alignment in automatic standing mode. For this purpose, the synchronous signal markings can be provided as automatic standing mode half-image synchronizing signals on the synchronous signal track of the film at those points which correspond to the described scanning position for the alignment of the automatic standing image half-image and the scanning raster. Currency c. If the positions of the synchronous signal markings are away from the center line of the assigned automatic still image field by any multiple £ (where Jt is the distance from the front end of a movable field to the front end of the next, adjacent movable field), these synchronous signal markings belong to either row a or the .aeihe b, as shown in FIG. 11. Each of these rows is used selectively depending on the position of the sync markers with respect to the sync sample position. This also means that the position of the detector can be determined in such a way that

it corresponds to either the no a or the -no b.

By providing sync signal markings inside of the fields for automatic standing operation is thus an automatic field alignment by means of a common detector is possible, which "operated the fields for lorma! and at the same time the fields for standing operation what is used for playback as standing Image is very beneficial.

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Claims (8)

Patent claims: QJ image reproducing device in which the information recorded on a tape-shaped recording material in successive fields image information field image · as read out is available sur playback of moving images from signals that are derived from the Biidinformation by continuous feed of the Aufzeichnungsiiiaterials with its associated drive and · the Images by holding one of the fields, characterized in that synchronous signal markings are recorded on the recording material for the reproduction of moving recording images, which are also used to generate a control signal for controlling a drive device for the Yorscnub of the tape-like recording material for the purpose of reproducing still images . 2. Mnrichtung according to claim 1, characterized in that that for the reproduction of a still picture, the drive device for the tape-shaped recording material can be switched to an auxiliary drive for the advance of the tape-shaped recording material. 3. A device according to claim 2, characterized in that a first scanning device is provided for determining synchronous signal markings at the time of playback of moving images, as well as a second scanning device for scanning synchronous signals which are at a distance Ί / 2 from the first Device is arranged, wherein -u is the distance from the front end of a movable!] Field to that of a subsequent adjacent movable field. 309842/0845 -20- 4. Device according to claim 3, characterized in that that the drive device can be switched to the auxiliary drive when a stationary image is displayed, and that the auxiliary drive by a upon detection of a synchronous signal marking for a moving picture by the second synchronous signal marking scanning device obtained signal can be stopped. 5. Set up after. Claim 1 characterized by means of ensuring that a scanning area of a haster at the time of playback of a still picture to half of the area given at the time of reproducing a moving picture. can be reduced and that at the same time an alignment between the position of the reduced scanning range and the position of one on the. tape-shaped recording material stored field is achievable. 6. Device according to claim 5, characterized in that the alignment between the position of the reduced Hasterabtastbereichas and the position of a field when reproducing a still image by delaying the synchronsignalmarklerungsdetektorsignals for reproducing the moving image by a delay time can be achieved during which the tape-shaped recording material over a distance -c / 2 advances, and by stopping the tape drive device by the delayed scan signal, where ⁴ C is the distance from the leading end of a moving field to that of a subsequent adjacent moving field. -21- 309842/0845 7. Device according to claim 3, characterized in that the tape-shaped recording material is a Includes the stationary field which is twice as long as the field of the moving image in the direction of tape travel, as well as synchronizing marks on a synchronizing track are provided at a distance of -C / 2 from the center of the respective still picture mode fields, that the spell drive device can be switched to the auxiliary drive when a synchronous pattern is detected both sync mark scanners, and that then when a synchronous signal marking is detected by the second locking device, the auxiliary drive can be switched off. - - 8. Device according to claim 7, characterized gekennzeicnnet that between two adjacent synchronizing signal markings For the reproduction of moving pictures, a further sync mark in front of the still picture field is foreseen. 309842/0845