FR2477353A1 - BAND FORMAT AND RECORDING AND RESTITUTION SYSTEM WITH MOVIOLA MODE - Google Patents

Abstract

THE PRESENT INVENTION RELATES TO A BAND FORMAT OF THE TYPE OR A DIGITAL COLOR VIDEO SIGNAL SAMPLE AT A PREDETERMINED MULTIPLE OF COLOR SUB-CARRIER FREQUENCY IS RECORDED, EACH IMAGE OR VIDEO GRID BEING ARRANGED ON A GROUP OF TRACKS, ONLY ONE PART OF L RECORDED INFORMATION FOR RESTITUTION TO REBUILD THE COLOR VIDEO SIGNAL DURING MOVIOLA MODE. ACCORDING TO THE INVENTION, ONLY GROUPS OF IMAGE SAMPLES RELATING TO COMPLETE COLOR SUB-CARRIER CYCLES 1-4, 5-8, 9-12, ETC ... ARE RECORDED ON TRACKS 1, 2 OR 3 SO THAT A VIDEO SIGNAL WITH GOOD COLOR INFORMATION CAN BE EASILY RECONSTRUCTED DURING MOVIOLA MODE. THE INVENTION APPLIES IN PARTICULAR TO COLOR TELEVISION.

Description

The present invention relates to a recording and

  rendering a sampled color video signal or in digital form, where each image or video grid is recorded on a group of tracks of a tape. During the search or moviola mode of this system, the recorded media is rendered at a very fast speed of the tape and a color video signal relating to a reduced quality picture or grid is reconstructed only from a part of the tape.

  information recorded on multiple images or grids.

  Although traditional techniques (described

  after) can adapt to a system to work in moviola mode, the moviola image resulting from these

  techniques will be of poor quality.

  According to the principles of the invention, in order to improve the quality of the image in moviola, only whole cycles of color subcarrier are recorded on the tracks in the recording and reproduction system according to the invention, thus a video signal can be reconstructed with good color information. In a preferred embodiment, groups of image samples relating to sequential cycles of the subcarrier are recorded on separate tracks of the band in the group of multiple tracks, groups of picture elements. to use for reconstructing the video signal during the moviola mode being recorded on a single track and repeating itself in sequence a number of times to derive a fill or load information for the other tracks. A convenient arrangement for recording a color video signal according to this invention comprises a buffer for each track and a multiplexer by which groups of elements

  image relating to whole cycles of sub-

  color carrier are directed in sequence to the buffers. Then, the pixel information is stored in the buffers during each cycle of the multiplexer and is simultaneously extracted.

  to the tracks at the end of each cycle of the multiplexer.

  A handy arrangement for the playback of a moviola signal according to this invention comprises a converter for presenting groups of picture elements of a single color subcarrier cycle of a single track, in parallel format, each picture element being available at a separate output. A multiplexer receiving the outputs of the converter undergoes repeated cycles to pass each group of picture elements moviola a number of times, equal to the number of tracks in the group of multiple tracks and thus instantaneously produce consistent information

  during a restitution in moviola mode.

  The invention will be better understood and other purposes, features, details and advantages of it

  will appear more clearly during the description

  following explanatory diagram with reference to the accompanying schematic drawings given solely by way of example illustrating several embodiments of the invention and in which: - Figure 1 illustrates the general concept of the present invention for a single scan line of the frame that is illustrated on three tracks of the band; FIG. 2 illustrates a rendering technique for reconstructing the scan line of the frame of FIG. 1 from a single track during the moviola mode; FIG. 3 illustrates a means of formatting by means of which tape can be recorded in a recording system according to the invention; FIG. 4 illustrates a format and reproduction means by which tape formats can be restored in the recording system according to the invention; FIG. 5 illustrates an embodiment of the invention where comparable cycles of color subcarrier of each scan line of a frame are recorded in the same order on the tracks; Fig. 6 illustrates an arrangement of the format selector means of Fig. 3 for the tape format of Fig. 5; FIG. 7 illustrates the vertical alignment of the raster segments that are obtained when the raster scan lines of FIG. 3 are restored using the same technique as that illustrated in FIG. 2; FIG. 8 illustrates another embodiment of the invention where comparable color subcarrier cycles of adjacent scan lines in a frame are recorded on the tracks in a different order; Figure 9 illustrates another arrangement of the format selector means of Figure 3 for the tape format of Figure 8; and FIG. 10 illustrates the diagonal alignment of the frame segments that are obtained when another rendering technique is used to reconstruct

  the raster scan lines of Figure 8.

  In systems for recording and reproducing sampled or digital color video signals,

  o A group of multiple tracks is used to record

  trer each image or grid, the very high speed of the recorded media during active search or moviola mode requires that a video signal be reconstructed only from a part of the recorded information, For such a system, the recorded video signal is brought under

  digital form by sampling it at a certain multiple.

  predetermined frequency of its color subcarrier.

  In this system, traditional techniques can be used to render the information in moviola mode only from a single track while the recorded medium is moving at high speed, for example, recording the track in moviola at the same time. by means of a head having an azimuthal angle space and restoring it by means of a head of a corresponding but oversized type As the moviola image is only restored by part of the recorded information only a reduced quality image is possible with such recording and playback systems during the moviola mode. Furthermore, the moviola rendered frame contains increments of many images or grids recorded due to the difference of

  the recorded media speed during recording modes.

  and in moviola. However, the quality of the image in moviola is greatly improved in the recording and playback system according to the invention where only groups of image samples relating to entire cycles of color subcarrier are recorded on individual tracks o a video signal containing good color information can easily be reconstructed by restoring a part

  of these groups of picture elements during the moviola mode.

  As will be described hereinafter, conventional digital hardware can be readily available to construct a format means for directing only groups of picture elements of entire color subcarrier cycles to either tracks when

  the recording - or tracks during the restitution.

  Since the moviola mode is most frequently used in systems having both recording and playback capabilities, recording and playback formatting means will generally be described for a recording and playback system. according to the invention, however, those skilled in the art will notice, without further explanation, that the recording and

  restitution can be accomplished by

  separate and separate systems with a recording formatting means according to the invention in a subsystem, a restitution formatting means according to the invention in the other subsystem, and a tape format according to the inventon

  saved in one subsystem and restored in the other.

  A preferred tape format for use in the recording and playback system according to the invention is illustrated in FIG. 1 with groups of image samples relating to sequential cycles of color subcarrier of a single frame scan line are recorded on separate tracks in the group of multiple tracks. Only

  for the present description, four elements or samples

  images are taken during each color subcarrier cycle, and three tracks are embedded in the track group. Therefore, the first four image samples which are represented by dots, relate to the first color subcarrier cycle and are recorded on the track 1; the four second samples

  of images that are represented by triangles, se -

  report to the second color subcarrier cycle and are recorded on track 2; the four third elements or image samples that are represented by

  squares, relate to the third cycle of sub-

  color carrier and are recorded on track 3; this same format is represented for each sequence of three cycles of subcarrier color until

  the entire frame scan line has been recorded.

  Then, during a moviola playback, the video signal for that line is reconstructed only from a portion of the image element groups of the recorded color subcarrier cycles, for example groups of only one of the three tracks as will be described below. However, the color information is preserved because this reconstruction is accomplished with the entire cycles of color subcarrier and therefore the quality of the resulting image is improved over that which can be achieved with systems

traditional registration.

  Without further explanation, those skilled in the art will easily understand that groups

  elements or image samples of sub-cycles

  Color carrier for all the frame scan lines of each grid or image will be recorded in the recording and playback system according to the invention. Furthermore, the track order in which the groups of elements or image samples of the color subcarrier sequential cycles are recorded in Fig. 1 is not a limitation to the recording and rendering system. according to the invention and in fact, other orders have been used to obtain the best results of restitution in moviola

as will be described below.

  When reconstructing a normal video signal for the frame scan line of Fig. 1, all groups of image samples of the recorded color subcarrier cycles are rendered in the sequence

  recorded, tracks in the group of multiple tracks.

  However, during the moviola mode, the video signal for this frame scan line must be reconstructed only of a portion of the picture element groups of color subcarrier cycles recorded with instantly coherent information which is derived from each group of picture elements for visualization as a segment of the frame in moviola. Although the portion of the image sample groups of the color subcarrier cycles to be rendered during the moviola mode may be scattered on all the tracks of the group of tracks according to the concept of the invention, these groups of elements images are recorded on a single track in moviola of the group of tracks in a traditional tape format, such as track 1 in the tape format of Figure 1. So the instantaneous consistent information for display in the form of a The segment of the moviola frame is derived by repeating each group of color subcarrier cycle picture elements in moviola a number of times, equal to the number of tracks in the group. For example, the groups of image samples relating to the first and fourth color subcarrier cycles in the raster scan line of Fig. 1 are three times in sequence when using this rendering technique, as is 2 of course, any number X of tracks may be used in the group of tracks and any number Y of sample samples may be used for each color subcarrier cycle in the recording system and of restitution according to the invention. Consequently, this restitution technique generally applies to a recording and reproduction system according to the invention, by repeating X every group of Y

  image samples pertaining to a sub cycle of

  color carrier in moviola on the track in moviola.

  A preferred means of formatting to direct only groups of frame samples of entire subcarrier cycles to the individual tracks upon recording is shown in FIG. 3s Groups of Image Samples sequential color subcarrier cycles representing each grid or image of the video signal are distributed to the group of multiple tracks by individual buffers for each track of the group. A multiplexer 12 operates per cycle to apply an image sample clock signal as a write clock signal and the image samples of the color subcarrier cycles to each buffer memory 10 in one sequence. set by a record format selector means 14 for controlling the multiplexer 12 to determine the input order in the buffers 10 of the sequential groups of image samples. The color subcarrier cycle image sample groups are stored in the buffers 10 during each cycle of the multiplexer 12 and are simultaneously extracted to the tracks at the end of each cycle of the multiplexer when the signal d! orlog is applied as a read clock signal by a frequency divider 16 which divides by a number equal to the number of tracks in the group. The horizontal synchronization signal and the image sample clock signal are applied to drive the format selector means 14. The image sample groups of the color subcarrier cycles can be processed by the means of recording format in the form of a serial or parallel digital word, with parallel-series serial converters 18 used to pass the output of each buffer memory

  when using a form of digital word in parallel.

  During the normal reconstruction of a video signal of the group of multiple tracks, all groups of samples of the color subcarry cycles recorded on the tracks are processed by a formatting means formatting identical structure but inverse to that of the means of formatting recording. Therefore, such rendering format means will direct the groups of picture elements of the color subcarrier cycles of the tracks to an arrangement of

  Parallel memory is buffed by serial converters

  parallel when necessary, and buffers to a reproduction circuit by a multiplexer under the general control of a format selector means during a moviola reconstruction of a video signal, however, the nature of the formatting means of restitution depends on the distribution of groups of image samples of the color subcarrier cycles in moviola in the group of tracks. Moreover, instantaneous coherent information must be derived from

  each group of picture elements of the sub-cycles

  color carrier in moviola that is restored. Accordingly, a recording and playback system which derives this information with the reproducing technique of the picture element groups of the previously described color subcarrier cycles will include a means for formatting and reproducing playback for lead

  groups of image samples of subcycle cycles

  color carrier in moviola of the group of tracks and repeat each group of image samples of the color subcarrier cycles during playback to produce the information When the video signal is reconstructed from a single track during the mode in moviola in the manner described above with respect to FIG. 2, such a means for formatting and reproducing reproduction can be represented as illustrated in FIG. 4. A format converter 20 is arranged in this arrangement to present each group of samples. image of color subcarrier cycle in moviola on the track in moviola in parallel format, each

  Image sample being available at a separate output.

  A multiplexer 24 receiving the outputs of the format converter 20, undergoes repeated cycles to pass each group of image samples of the color subcarrier cycles in moviola, a number of times, equal to the number of tracks in the group. Depending on the desired video display format, the signal at the output of the multiplexer 24 may pass directly to the display or display circuit, as will be better described hereinafter. A track image sample clock signal is applied to the converter 20 to pass

  in sequence the groups of image samples of the cycles-

  of color subcarrier and is also applied to control the multiplexer 24 through a series arrangement of a frequency multiplier 28 by a number equal to the number of tracks in the group and a modulo counter 30 having an equal count to the number of image samples in each group of image samples of

color subcarrier cycles.

  Fig. 5 shows a particular tape format for the recording and playback system according to the invention; groups of image samples of the corresponding color subcarrier cycles; of each scan line of a frame, are recorded in

  the same order on the tracks of the group of tracks. Unique-

  in the context of this description, the number of

  of image samples in each group relating to each color subcarrier cycle and the number of tracks in the track group, are the same as those previously selected for the single raster scan line recorded in Figure 1 Therefore, image samples 1-4 relating to the first color subcarrier cycle of each frame scan line are recorded on track 1; the image samples 5-8 relating to the second color subcarrier cycle of each frame scan line are recorded on the track 2; image samples 9-12 pertaining to the third subcarrier cycle

  the color of each raster scan line are recorded

  very on track 3; the image samples 13-16 relating to the fourth color subcarrier cycle in each frame scan line are also recorded on the track 1; the image samples 17-20 relating to the fifth color subcarrier cycle of each frame scan line are also recorded on the track 2; the image samples 21-24 relating to the sixth color subcarrier cycle of each raster scan line are also recorded on the track 3; and so on until groups of image samples of color subcarrier cycles of all scan lines

  frame are saved. Thus, sub-cycles

  corresponding color carrier1-4, 13-16 and others of line 1, track 1 are in the same order for the lines

  2, 3 and others on track 1 (P: track, L: line).

  The recording format means or the format mioe and reproduction reproduction means which are illustrated in FIGS. 3 and 4 respectively, can be used with the tape format of FIG. 5. As can be seen in FIG. 6, the format selector means 14 in the registration formatting means of FIG. 3 will then comprise a modulo counter 32 and a frequency divider 34. The modulo counter 32 will have an account equal to the number of tracks the group of tracks and its output will be applied as the control signal of the

  multiplexer of Figure 3. The signal at the output of the divi-

  34 will be applied to the increment input increment of the modulus counter 32 and divide the image sample clock frequency by the number of image samples in each image sample group. a color subcarrier cycle while the horizontal sync signal will be applied to the input of

  reset or reset the modulo 32 counter.

  Accordingly, the signal at the output of the modulo counter 32 in Fig. 6 advances the multiplexer 12 of Fig. 3 to a new buffer position for each series of sample clock pulses.

  equalization, in duration, to the duration of a group of samples

  image of a color subcarrier cycle and returns the multiplexer 12 to the first buffer

  after each horizontal sync pulse.

  As previously described, the rendering format and reproducing means of FIG. 4 reconstructs the video signal in moviola from groups of image samples of color subcarrier cycles on a track mule. Each of these groups of image samples is separated into individual image samples at the outputs of the converter 20 and is then repeated for display by the multiplexer 24 that the modulator counter operates a number of cycles, equal to the number of tracks. in the group of tracks for each group of image samples. Assuming that track 1 of the tape format of Figure 5 is used for such moviola rendering, a video signal for a full color image will be reconstructed from the image sample groups 1-4 and 13-. 16 in each frame scan line as illustrated by the playback format of Fig. 7 where each group of image samples is repeated three times in sequence to provide instantaneously consistent information for display as a segment of the frame in moviola. Like groups of samples

  image relating to corresponding cycles of sub-

  color carrier in each frame scan line are recorded in the same tracks of the tape format of Figure 5, corresponding image segments produced by repeating the groups of image samples of the color subcarrier cycles in moviola however, will be aligned in a vertical pattern. Although the resulting moviola image has a better quality as previously described, the vertical pattern will limit its quality due to the horizontal resolution

  restricted causing the formation of colored stripes.

  This vertical pattern can be avoided by using another tape format for the recording and playback system according to the invention, or groups of image samples of corresponding color subcarrier cycles in adjacent scan lines. frame are recorded on the separate tracks in the group of

  multiple tracks, as can be seen in Figure 8.

  Only in the context of this description,

  the number of image samples of each group relating to each subcarrier cycle and the number of tracks in the group of tracks, are the same as those previously chosen for the only frame scan line recorded in the figure Therefore, frame scan line 1 is recorded with its image sample groups 1-4, 13-16, and others on track 1; its groups of image samples 5-6, 17-20 and others, on lane 2; its groups of image samples 9-12, 21-24 and others, on lane 3; while the bSay frame 2 line is recorded with its sample groups 5-8, 17-20 and others on track 1; its groups of image samples 1-4, 13-16, and others on lane 2; its groups of image samples 9-12, 21-24 and others, on lane 3; and the frame scan line 3 is recorded with its image sample groups 9-12, 21-24, and others on track 1; groups of image samples 5-8, 17-20 and others on lane 2; its groups of image samples 1-4, 13-16 and others on track 3. Thus, the corresponding cycle of color subcarrier 1-4 for example is recorded on track 1 for line 1, track 2 for

  line 2 and track 3 for line 3.

  - The tape format of Figure 8 can be recorded

  The format selector means 14 will then control the multiplexer 12 by a read-only memory 36, as shown in FIG. 9. The outputs of two counters modulo 38 and 40 are applied to advance the read-only memory 36 by its program which is set up to record groups of corresponding color subcarrier cycle image samples in addacent frame scan lines on separate tracks of the group of tracks. Each modulo counter 38 and 40 has an count equal to the number of tracks in the track group and the horizontal synchronization signal is applied to the increment input increment of the modulo counter 40 and to the reset or reset input Zero modulo counter 38. The clock signal

  image sample is applied to the increase input

  incrementally incrementing the modulo counter 38 by a frequency divider 39 which divides by a number equal to the number of image samples of each group of color subcarrier cycle image samples, Accordingly, the multiplexer 12 of FIG. 3 directs the bits of a group of full color subcarrier cycle image samples to an individual buffer memory for each pulse that the ROM 36 receives from the modulo counter 38 and changes the multiplexer 12 to each pulse that the ROM 36 receives from the modulo counter, To record the tape format of FIG. 8, the switching sequence of the multiplexer 12 is by the buffers 1, 2, 3 and others for the line 1; buffers 2, 1 3 and others for line 2; buffers 3, 2, 1 and others for line 3; and a repetition of these sequences up to that all the raster scan lines have been recorded, the tape format of FIG. 8 can be reproduced by the format and reproducing reproduction means of FIG. 4, with another multiplexer 42 incorporated for staggering. the rendering of each frame baying line with respect to adjacent lines and thus giving a restitution format having a pattern

  diagonally of repeated groups of image samples, -

  not corresponding in adjacent lines of frame bSay as shown in Fig. 10. The multiplexer 42 has a single output and a number of sequential inputs equal to the number of tracks in the group of tracks, and these inputs are arranged from a first entry to a last entry. The successive inputs between the first and the last are interconnected by a delay of a duration equal to the duration of a color subcarrier cycle and the output of the multiplexer 24 is applied to the first input. The multiplexer 42 is controlled by the horizontal synchronization signal which is applied by a modulo counter 46 having an count equal to the number of tracks in the group of tracks. Accordingly, when the multiplexer 42 is placed at its first input, the repeated sample groups of the multiplexer 24 pass for display without delay. While the input position of the multiplexer 42 is switched for each horizontal sync signal however, the display or display of these image sample groups is delayed by an additional duration of a subcarrier cycle

  color at each sequential entry.

  The format and reproduction reproduction means of FIG. 4 then functions to reproduce the tape format of FIG. 4 in the rendering format of FIG.

  frame scan 1 is displayed with the sample group

  image slits 1-4 repeated three times to fill the image sample locations 1-12, the image sample group 13-16 being repeated three times to fill the image sample locations 1324 And so on; the raster scan line 2 is displayed with a dummy group of image samples filling the locations 1-4 during a delay, the image sample group 5-8 being repeated three times to fill the locations 5- 16, the image sample group 17-20 being repeated three times to fill the locations 17-28 and so on; the raster scan line 3 is presented with two groups of dummy image samples filling in the slots 1-8 for two delays, the image sample group 9-12 being repeated three times to fill the locations 9-20 the image sample group 21-24 being repeated three times to fill the locations 21-32 and so on; the frame scan line 4 is reproduced in the same way as the line 1 and the playback format is reproduced next

  until the frame or video image is complete.

  The traditional border conditions of a frame eliminate any importance to the nature of the dummy image sample groups because many image samples at the beginning and at the end of each frame scan line are invisible. For example, a typical frame sweep line contains 910

  image samples of which only 768 are visible.

  However, the dummy groups for any frame scan line can be derived in many ways to use the image sample groups at the end of the immediately preceding frame scan line or simply to leave the offset distance in White. A moviola image of a very acceptable quality results from the diagonal pattern of groups of non-corresponding image samples in the format of Figure 10. Those skilled in the art will understand without further explanation that other reasons diagonally, groups of non-corresponding image samples are also possible as a moviola rendition system which presents higher quality images in comparison with the previously described rendering format of FIG. 7 where the vertical pattern of the groups of samples corresponding image is formed. Of course, the invention is not limited to the embodiments described and shown which have been given by way of example. In particular, it comprises all the means constituting technical equivalents of the means described as well as their combinations if they are executed according to its spirit and implemented in the context of the protection as claimed,

Claims (11)

R E V E N D I C A T I 0 N S ___________________________   1. A type of tape format where a digital color video signal sampled at a predetermined multiple of the color subcarrier frequency is recorded with each frame or video grid arranged on a group of multiple tracks, and with only a part of the recorded information that is intended for playback to reconstruct the color video signal during a mode   moviola, characterized in that only groups of samples   images relating to cycles   color carriers (1-4; 5-8; 9-12; and others) are recorded on the tracks (1, 2, or 3) so that a video signal having good color information can   to be easily reconstructed during the moviola mode.   2, The format according to claim 1, characterized in that groups of image samples of color subcarrier cycles are recorded on tracks.   in the group of tracks, the groups of samples   image to be rendered during the moviola mode being recorded on a single track (1), so that the groups of image samples of color subcarrier cycles in moviola on the single track can be repeated in sequence when of the reconstruction of the video signal during the moviola mode, to give instantly coherent information, The format according to claim 2, characterized in that groups of corresponding color subcarrier cycle image samples of each raster scan line are recorded in the same order on the tracks of the track group so that each repeated sequence of a group of color subcarrier cycle image samples of a raster scan line in vertical alignment with the repeated sequence of groups of color subcarrier cycle image samples Corresponding other lines   frame scan during moviola mode.   A format according to claim 2, characterized in that groups of corresponding color subcarrier cycle image samples in adjacent raster scan lines are recorded on separate tracks of the track group, thus dummy groups of Image samples can be embedded during the moviola mode to shift the rendition of each frame scan line with respect to   adjacent lines and thus derive a restitution format   repeated sampling of groups of samples   image of color subcarrier cycles not corre-   in adjacent raster scan lines   are aligned in a diagonal pattern.   A recording system advantageously utilizing the tape format of claim 1, characterized by formatting means for directing only groups of image samples of entire subcarrier cycles to the individual tracks when the record. The system of claim 5, characterized in that said registration formatting means comprises: a buffer memory (10) for each track of the group of tracks; a multiplexer (12) passes separately from sequential groups of color subcarrier cycle image samples to said buffer memories, said groups of image samples being stored in said buffers during each cycle of said multiplexer and being simultaneously extracted to said tracks at the end of each cycle of the multiplexer; and a recording format selector means (14) for controlling said multiplexer and determining the input order in said buffers of said groups   sequential image samples.   7. System according to claim 6, characterized in that the aforementioned selector means (14) controls the above-mentioned multiplexer (12) by a modulo counter (32; 38) for recording groups of sub-cycle image samples. corresponding color carrier of each frame scan line in the same order on the aforementioned tracks of the group of tracks, said modulo counter (32; 38) having an count equal to the number of tracks and having the horizontal synchronization signal applied to its input reset while the clock signal   sample of image is applied to its input of   incrementally by a divisor (34; 39) which divides by a number equal to the number of image samples in   each group of sub-cycle image samples color carrier.   8 ,. System according to claim 6, characterized in that said selector means (14) controls said multiplexer (12) by a read-only memory (36) programmed with the multiplexing sequence necessary to record groups of cycle image samples. corresponding color subcarrier in adjacent frame scan lines on separate tracks of the group of tracks, said ROM receiving the horizontal synchronization signal by a first modulo counter (40) having an count equal to the number of tracks in the group of multiple tracks and receiving the output of a second modulo modulator (38) having an count equal to the number of tracks in the group of multiple tracks, said second counter (38) receiving the horizontal synchronization signal at its input resetting and the image sample clock signal applied to its input incrementally increasing by a divisor (39) which divides by an equal number l the number of image samples in each sample group   image of color subcarrier cycles.   A rendering system advantageously utilizing the tape format according to claim 1, characterized by formatting and reproducing reproduction means (20, 24, 28, 30) for directing the groups of image samples of the cycles. sub-carrier color in moviola of the group of tracks and repeat each group of image samples a number of times to give a consistent and instantaneous information during the mode in moviola.   The system of claim 9, characterized in that the groups of sequential color subcarrier cycle image samples are recorded on separate tracks in the group of tracks, corresponding image sample groups of each frame scan line being recorded in the same order on the tracks of the group of tracks; and in that only groups of imae samples on a single track are processed by said means for formatting and reproducing movi-ola playback which comprises: a format converter (20) for presenting   groups of image samples of subcycle cycles   colored carrier in moviola on said single track in   format in parallel with each sample of   ge available at a separate exit; and a multiplexer (24) to which the outputs of said converter are applied, said multiplexer operating per cycle to repeatedly pass each group of color subcarrier cycle image samples in moviola a number of times, equal to number of tracks in said group of tracks, so that when displayed, each repeated sequence of groups of image samples of a raster scan line is vertically aligned with the corresponding repeated sequence of groups of samples d image of color subcarrier cycles of other scan lines frame.   System according to claim 9, characterized in that the groups of image samples of sequential color subcarrier cycles are recorded on separate tracks in the group of tracks, groups of corresponding image samples in adjacent raster scan lines being recorded on separate tracks of the track group; and in that the groups of single-tracked image samples are processed by the aforementioned format and reproduction reproduction means which comprises: a format converter (20) for presenting the groups of moviola color subcarrier cycle image samples on said track in a parallel format, each image sample being available at a separate output; a first multiplexer (24) to which the outputs of said converter are applied, said first multiplexer operating in cycles to repeatedly pass each group of image samples a number of times, equal to the number of tracks in the group of tracks ; and a second multiplexer (42) having a single output and a number of inputs, equal to the number of tracks in the group of tracks, said sequential inputs being arranged from a first input to a last input, each successive input therebetween being interconnected by a delay (44) of a duration equal to the duration of a color subcarrier cycle, said first input receiving the output of said first multiplexer, said second multiplexer operating per cycle through the successive inputs by the signal of horizontal synchronization (by 46) so that, during the display, each raster scan line is shifted with respect to the adjacent lines, each repeated sequence   of a group of sub-cycle image samples   color carrier in a raster scan line being diagonally aligned with repeated sequences   groups of sub-cycle image samples   color carrier in adjacent lines that do not do not fit.