FR2480472A1 - BAND FORMAT FOR RECORDING OR RECOVERY SYSTEM, RECORDING SYSTEM, AND RESTITUTION SYSTEM USING THE SAME - Google Patents

Abstract

THE INVENTION RELATES TO A TAPE FORMAT FOR A RECORDING AND / OR RESTITUTION SYSTEM. ACCORDING TO THE INVENTION, PACKAGES OF SEQUENTIALLY ARISING INFORMATION ARE ARRANGED ON THE MULTI-TRACK BAND A, B, C, AND D IN LOCATIONS SEPARATE BY STATISTICALLY LENGTH OF FALL SSDL OF THE BAND TO ENSURE THAT WHEN FALLS DURING RETURN, EACH PACKAGE OF ERRONEOUS INFORMATION MAY BE RETURNED IN SEQUENCE TO ADJACENT PACKETS OF STATISTICALLY RELIABLE INFORMATION OR ESTIMATED PACKETS OF INFORMATION MAY BE DERIVED TO DISSIMULATE ERRONEOUS PACKAGES. THE INVENTION APPLIES IN PARTICULAR TO MAGNETIC TAPE RECORDING.

Description

-.1 In 1 tape recording, the quality of the tape

  This usually determines the magnitude of the error, the error rate, and the presence of error in the stored error. Two characteristics of the band are predominant in this determination of error, precision. which the particles of the magnetic plane are spotted on the band and the faeFence with which we find the grernide of the oxide

  m gneticQ.ue 0 lou di res dmus over the length of the strip.

  A defect in the presence of particles of magmetic oxide was observed in the background of the recorded information. the cost of a standard band from this point of view is as high as it is. oi an error of no importance, but it must be avoided, especially if a certain number of languages are involved. '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' ^ '' '' '' '' '' '' '' '' ^ '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' , 0 ps? EF-mp! E if 1 Video-editing is saved under foP._e ntnméreco An important error can be made with correction tecniques by adding a data of coding to the information recorded and deter- mined during the rendition9 or by concealment techniques derived from the estimated values of another recorded information to replace the erroneous inference during the rendition. hiding the error are easier to implement, they may be preferred but such techniques are unreliable because the other recorded information used to estimate values

  replacement can also be wrong.

  According to the principles of the invention, by formatting packets sequentially presenting band information at locations separated by the statistically significant fall length (hereinafter SSDL) of the band, the reliability of the concealment techniques the error is increased to a point where the

  fault rate or defect are arbitrarily low.

  Through the SSDL separation, each erroneous information packet is sequentially rendered to adjacent packets of statistically reliable information from which estimated packets of information may be derived to hide or conceal erroneous information packets. In order to obtain the SSDL separation in a tape recording and / or rendering system using this tape format, transducers are particularly arranged on a rotating machine in its embodiment of the system, while delay lines are incorporated in a

  another embodiment of the system.

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

  will become clearer during the description

  explanatory text which will follow 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 a multi-track format for a preferred embodiment of the invention; FIG. 2 shows the restitution sequence of the information packets of the band format of FIG. 1, to show that each packet of erroneous information is disposed between packets of statistically reliable information; FIG. 3 illustrates a transducer scanning arrangement for implementing the tape format of FIG. 1 in a recording and / or playback system; FIG. 4 illustrates a delay line arrangement for implementing the band format of FIG. 1 in a recording system; and FIG. 5 illustrates a delay line arrangement for implementing the band format of the

  Figure I in a rendering system.

  Although the tape format of this

  invention can be used in recording systems.

  In the present invention, a tape portion is shown in FIG. 1 with a multi-path helicoidal exploration format for a preferred embodiment of the invention. In this format, sequentially presented packets of information are arranged on the tape at locations separated by the SSDL of the tape to ensure that when a fall occurs during the rendition, each packet of the erroneous information

  will be arranged adjacent to statistical information packets

  o reliable information packages estimated information

  can be derived to conceal information packages.

  wrong. The number of tracks in the multi-track format is not limited but only four tracks A, B, C

  and D are shown in Figure 1 as illustrative

  tion. A recording and / or reproducing head 10 (shown in FIG. 3) rotates to simultaneously explore these tracks with individual transducers 12, 14, 16 and 18. Consecutive packets of the information are recorded at the SSDL interval on different tracks with the first deck on track A, the second deck on track B, the third deck on track C, the fourth deck on track D, the fifth deck again on track A immediately adjacent to the first deck And so on. The information packets may represent any distinct quantity of the recorded information, such as individual bits of an image sample or a full image sample or a number of image samples in images.

  video recording applications in digital form.

  Each packet of information will contain traditional signal means such as check bits, to detect whether it is wrong during the rendition. It may seem that a large space on the tape is lost by this particular format, but the SSDLs and the angle of the tracks relative to the direction of the course of the tape are shown out of proportion for illustration. If those who are competent in the field consider that the tracks are 40.64 cm long and less than 0.0254 cm wide, while the strip is 2.54 cm wide and that a large SSDL is 0.254 cm in width. the typical helical exploration application, they will understand without further explanation, that there is essentially no room on the tape that

is lost by this format.

  As described above, defects in the length of the band force the head 10 to separate from the band and this causes a drop in the information

  during the registration and / or return operations.

  Although the size and frequency of these defects generally depend on the quality of the tape, the nature of these defects on a tape of any given quality will also vary. Since the size of each defect determines the length of the fall encountered, a dimensional distribution curve can be represented for the defects on any band and the SSDL as being

  determined in terms of the distance of the track on the band.

  Due to SSDL separation on the band between sequential packets of information, adjacent packets of erroneous information are very unlikely when packets of information are restored from the band in the recorded sequence. This improbability is illustrated in FIG. 2 where it is assumed that a defect exists which can cause a fall in the band of FIG. 1, and that therefore the information packets 2, 6 and 10 are erroneous. Each erroneous information packet is represented

  by "B" while each statistical information package

  Relatively reliable is represented by "G" in FIG. 2, and only G's are adjacent to the B's in the retrieved information. Therefore, traditional techniques can be reliably applied to conceal the erroneous packets of the information that has fallen and that is statistically significant (in Figure 2, the information packet restitution sequence is indicated above the horizontal bar while the type of

package is shown below.

  A transducer ex- amination arrangement for recording and / or reproducing the tape format of FIG. 1 is illustrated in FIG. 5 where the transducers 12, 14, 16 and 18 are equally spaced from each other around the periphery of the transducer. the rotary head 10, the same distance equal to the SSDL value of the tape Each transducer 12,:. 16 and 13 is also uniquely placed in the cylindrical headwire of the head and on the left-hand side: the band 24 on a peripheral side of the side 10. The information to be recorded on the tape, in the format according to the invention, is applied

  to the transducers 12, 14, 16 and 18 by collector rings

  triees (nov rerésentées) from a means 26 to quarry this information in packets of the chosen type

  and distribute these sequential pills to the trans-

  iducts 12, 14, 16 and 18 in the chosen way. The means 26 for quantizing and distributing the packets may be conventional counters and switches according to obvious arrangements of those skilled in the art.

  the material. The same arrangement of exploration to trans-

  ductors will also be used to restore the tape format of Figure 1o The information to be restored is captured from the tape by the transducers 12, 14, 16 and 18 and is applied by the slip rings to a means 28

  to accumulate packets in their recorded sequence.

  The accumulation means 28 may also contain conventional meters and switches in arrangements

  obvious to those who are competent in this area.

  A delay line arrangement for recording the tape format of FIG. 1 is illustrated in FIG. 4, where delay lines 30, 32 and 34 are arranged to separate the information packets by the SSDL. The information to be recorded is applied to the band by a transducer exploration arrangement similar to that of FIG. 3 except that the transducers 12, 14, 16 and 18 will be aligned along the axis direction. cylindrical of the head. The delay lines 30, 32 and 34 are disposed between the transducer scanning arrangement and a means 36 for quantizing the packet information of the selected type and distributing the sequential packets to the transducer scanning arrangement at the transmitter. chosen way. The means 36 for quantizing and distributing the packets may contain conventional counters and switches in obvious arrangements of those who are comrétents in the matter. The delay of each line 30, 52, 3: - is provided from the time required to record a distance of the track equal to the value of SSDL and in digital recording systems, this time is equal to a number N-bits. Like every package

  information in track B is recorded sequentially-

  After a packet of the information in the track A for the tape format of FIG. 1, the packets of the information pass directly to the track A and the packets of the information pass through the delay line 30 of N bits to track B. Furthermore, each packet of information on track C is recorded sequentially after a packet of information on track B while each packet of information on track D is recorded sequentially after a packet of information on the track C and therefore the packets of the information pass through the delay line 32 of two N bits to the track C while the packets of the information pass through the delay line 34 of three N bits to the track D. As can be seen in Figure 5, a delay line arrangement similar to that of Figure 4 can be used to restore the band format of Figure 1. However , the order of the delay lines 30, 32 and 34 is inverted, the track D passing without any delay, the track C passing through the delay line 30, the track B passing through the delay line 32 and the track A passing through the delay line 34, to group the

  packets of information according to their recorded sequence.

  The information to be rendered is picked up on the tape by the transducer scanning arrangement and is applied by the delay lines 30, 32, 34 to a means 38 accumulating the packets according to their recorded sequence. The accumulation means 38 may also contain traditional meters and switches in obvious arrangements.

  of those who are competent in the matter.

  When using delay line arrangements such as those described above, in a system for recording and reproducing the tape format according to the invention, the SSDL value of the tape can be flexibly derived. Those who are competent in the field will realize, without further explanation, that circuits can be studied to derive the value of SSDL while recording and to adjust the length of

  delay lines accordingly in the recording system.

  and restitution. On the other hand, if separate recording and playback systems are used, the flexibly derived SSDL values can be recorded on the tape to coordinate the length of the delay lines in the rendering system with those of the DVDD system. recording for each tape unit

o The information is saved.

  Of course, the invention is not limited to the embodiments described and shown which have been given by way of example. In particular, it includes all the means constituting technical equivalents of the means described and their combinations if they are executed according to its spirit and implemented.

  in the context of protection as claimed.

Claims (6)

R E V E N D I C A T I 0 N S   A tape format for a recording and / or playback system, characterized in that sequentially packets of information are arranged on the tape at locations separated by the statistically significant drop length of the tape. to ensure that when the fall occurs during the rendering, each packet of the erroneous information can be retrieved in sequence to adjacent packets of statistically reliable information where estimated packets of the information can be derived for   hide packages of the wrong information.   2. A tape format according to claim 1, characterized in that the packets of the above-mentioned information in sequence are arranged on   separate tracks in a multi-track format.   3. A tape format according to claim 2, characterized in that four individual tracks are   incorporated into the aforementioned multi-track format.   4. A tape recording system advantageously using the tape format according to claim 1, characterized by means (36, 30, 32, 34) for separating packets of information occurring sequentially on said tape, by the length statistically significant drop of the tape to ensure that when the fall will occur during rendering, each erroneous packet of information can be retrieved in sequence to adjacent packets of statistically reliable information from estimated packets of the information can be derived to conceal erroneous information packets.  5. System according to claim 4, characterized in that the aforesaid separation means comprises a rotating head (10) having transducers (12-18) arranged therein to allow the separation of a statistically significant fall length. between packages information.   6. The system according to Claim 49, characterized in that the aforesaid separation means comprises a delay line arrangement (350, 329 34) through which the statially significant fall length separation is obtained.   between packets of information is produced.   7o = tape restitution system using the tape format according to claim 1, characterized by means (38, 3C, 32, 34) for collecting the iiformation packets according to theirequency recorded on the b? where they are separated by the length of fall statiiq-ument simporten'e this band, and ensure that luean. a fall occurs during the restitution, and then the error is returned in sequence to adjacent packets of statisti = Quem information. it is easy to do so. Estimated packets of information can be retrieved to conceal erroneous information packets 8. System according to Claim 7, characterized in that the aforesaid means for collecting the information packets comprise a rotary head (10) with transistors ( 12-18) arranged therein for sensing sequentially recorded packets of information 25.from strip emolences separated by the statistically significant drop length 9 - System according to claim 7, characterized in that the aforesaid means gathering the information packets includes a delay line arrangement (30, 32, 34) for sequentially aligning recorded packets of information of tape locations that are separated by the statistically large fall length.