DE1079102B - Method and apparatus for recording television images on film - Google Patents

Description

The invention relates to a method of recording television video signals Television pictures on film.

When recording τοη television pictures on progressively advanced cinema film result Difficulties because, on the one hand, the pauses between the television pictures are determined by television standards and because, on the other hand, the progression of the cinema film within the limits set by the television standards Breaks is not easily achievable.

As is well known, to overcome this difficulty one has the effect of the afterglow on the Fluorescent screen made use of the picture tube. The television images are shown by means of a picture tube and in particular written on the screen of this picture tube by means of a cathode ray and imaged on a movie by means of a lens system. To keep track of the film progression on the In order not to let image parts written down on the screen get lost, these are due to the afterglow effect the fluorescent screens saved. Is the afterglow long enough i. h., that stays with image recorded on the cathode ray with sufficient intensity over a larger part of the The vertical period of the television grid exists as an afterglow image, "o they go during the film advance The recorded parts of the image are not lost, but have a retroactive effect on the film.

The afterglow must be used so that no differences in intensity are noticeable on the film in a disturbing manner last a relatively long time. On the other hand, this afterglow period must not last too long, otherwise with rapid movements cause trailing effects. There was also a synchronized light control those parts of the video signals whose afterglow image is to appear on the film. The one When the lens is closed, the field is written so brightly that the afterglow image decreases shows the same brightness as the other field, which normally appears when the lens shutter is open the movie is recorded.

However, this method has the disadvantage that it is not very easy to control the exact brightness of the to carry out a half image, since the luminance of both sub-rasters is exactly the same over the entire area have to be. Furthermore, sharpness is lost in the brightness control of the writing spot.

An arrangement for recording a television picture on two separate films is also known. In each case, one field is on one film and the other field on the other film recorded, and the film transport takes place in each case at the times when recorded on the other film will. This type of recording seems to be the method and apparatus

for recording television images

on film

Applicant:

TV G. mb H. _F

Darmstadt, Am Alten Bahnhof 6

Dipl.-Phys. Andreas Soeder, Darmstadt,
has been named as the inventor

to be difficult to produce a single projectionable film whose fields are just right Take position.

In addition, a method for recording television images is known in which two optical Systems are used. This is done when the film is moving continuously a shutter alternates the light path through one of the optical systems during field recording blocked and the light path released through the other optical system. To the right one To ensure distance between the two optical systems is made by the optical systems and a light spot is projected through the perforation of the film, and then controls are which should guarantee the correct mapping of the two fields. Despite these controls it is very difficult in practice to place the lines of a field in the middle between the To project lines of the other field.

The invention aims to avoid the aforementioned disadvantages and difficulties.

According to the invention, the television video signals are each two successive fields initially in stored in a buffer. According to a feature of the invention, this is stored information decreased with increased frequency and thus between the signals of two consecutive ones Sub-images created a pause that should at least correspond to the period of time that the Continuation of a film is required. According to a further feature of the invention this taped sequence of television video signals in a known manner for generating images on a Television screen is used and these images are imaged on the film by means of a film camera.

909 7β9 / 213

An endless magnetic tape can be used as temporary storage, on which one place continuously recording the incoming television video signals while at another location of this magnetic tape, the information stored by this recording at increased speed is removed.

It would also be conceivable to use storage tubes or runtime chains as intermediate storage. Included ίο both images should be stored in different places in order to avoid overlaps in the case of even-numbered and avoid odd fields in storage and resampling.

The invention is described in more detail below with reference to FIGS. It shows

1 shows a schematic representation of the storage and scanning process,

2 shows an exemplary embodiment using a magnetic tape buffer,

3 shows an exemplary embodiment using two storage tubes as intermediate storage.

In Fig. 1 sequences of television video signals 5 "are shown, the signal components I to VII correspond to successive fields. The duration of the blanking intervals A is limited by the European television standard (625 lines, 50 fields per second) and is so short that one Continuation of movies during the duration of this blanking interval A could only be carried out technically with great difficulty up to now.

According to the invention, the signal components I and II or III and IV or V and VI etc. are each briefly stored in a buffer and this information is then removed from the memory so quickly that between the now existing signal components Γ and ΙΓ or . III 'and IV ... the sequence of video signals vS "which pause" arise. This sequence S' is fed to a television receiver, made visible as an image on the screen of a cathode ray tube and displayed on a film. The duration of the blanking intervals A ' is now dimensioned in such a way that the film can be indexed step-by-step during this period.

In Fig. 2 the magnetic tape 1 is shown, which runs with the layer inward over a drum 2, over two pulleys 3 and over a drum 4 consisting of two disks. The magnetic tape 1 is driven at a constant speed by means of the drum 2. With the recording head 5 _Λ which the movement of the magnetic tape 1 is 5 "placed in front of the drum 4 with respect to, the television video signals are recorded and, after the drum 4, this recording is erased with the erasing head. 6, the re-sampling is carried out inside the drum 4 through the Scanning head 7, which rotates in an expedient ratio to the image frequency, for example, one revolution of scanning head 7 should correspond to the duration of two rasters (fields).

The magnetic tape 1 can only be scanned in the area in which it rests on the circumference of the drum 4. This part of the circumference of the drum 4 and the unused part of the circumference are matched to the switching ratio of the film recording camera in such a way that during the time in which the unused part is traversed, the recording camera of the recording system switches the film. The switching ratio can be 1: 4, for example. Then the angle α is related to the angular structure α + β as 1: 4, and the magnetic tape speed V ₁ is four times the speed _{V 2 of} the scanning head 7.

The relative tape speed compared to the speed of the scanning head 7 and its The phase position is set up in such a way that the beginning of the first partial image is scanned when the scanning head 7 reaches point 8. At point 9, the end of the second partial image is scanned. Then the The film is switched on and the process repeats itself again.

In some cases it may be useful to have two or more loops of film on drums 2 and 4 to be attached in order to be able to switch quickly from one storage medium to the other if necessary. It can also be advantageous to have several recording heads 5 and several scanning heads 7 on several Provide tracks of a tape.

3 shows a block diagram of a buffer using storage tubes. Of the A television video signal provided with blanking gaps is fed to the circuit at terminal 11 and to the Amplifier 12 forwarded. This also receives a synchronous mix of horizontal and vertical sync pulses.

In the amplifier 12, from the successive signal components I, II, III ... (FIG. I), the signal components II, IV The pulse train is fed to the storage tubes 14 and 15 in such a way that every other field signal component controls one tube. The deflection systems 16 and 17 are alternately supplied with horizontal and vertical frequency breakdown voltages from the breakdown generator K in accordance with the European standard and with breakdown voltages of higher frequencies in accordance with the image sequence Ι ', ΙΓ, ΙΙΓ, etc. These breakover voltages of higher frequencies are fed in via terminal 18. If now the first signal component I corresponding to the first field is stored on the storage disk 20 of the first storage tube 14, the signal component II is stored on the storage disk 19 of the storage tube 15 corresponding to the second field.

The first field (corresponding to the signal component I), which is recorded on the storage disk 20, and the second field (corresponding to the signal component II), which is stored on the storage disk 19, are now scanned briefly one after the other at higher toggle frequencies Signals taken from resistors 21 and 22 and mixed again in stage 23. Since the signal components III and IV or V and VI ... are handled in the same way, a signal S ' is generated, the load gaps A' of which lasts long enough to enable a film camera to be switched on within this period of time.

Claims (3)

Patent claims: 1. A method for recording television video signals or television images on film, characterized in that the television video signals (S) each two successive fields (I and II or III and IV. ..) first in a buffer (1,14,15 ) are stored that this stored information is removed with increased frequency in order to allow a pause (A ') to arise between the signals of two successive fields (II' and III 'or IV and V' ...), which is at least corresponds to the period of time required to advance a Films is required, and that this removed sequence of television video signals (S ') is used in a known manner to generate images on a television screen and these images are displayed on the film by means of a film camera. 2. Apparatus for carrying out the method according to claim 1, characterized in that an endless magnetic tape (1) is used as a buffer, on which the incoming television video signals (S) are continuously recorded at one point, while at another point this magnetic tape through this record stored information is removed at increased speed. 3. Device for performing the method according to claim 1, characterized in that that storage tubes (14,15) are used as intermediate storage (1, 14, 15). Considered publications:
German Patent No. 1,027,714;
French patent specification No. 941775, additional patent specification No. 58 361. 1 sheet of drawings © 909 769/213 3.60