DE1512362A1 - Color image recording with limited bandwidth - Google Patents

Description

Dlpl.-lng. Erioh E. Walther 2000 hamburq 1.

p «t.« i «w _e ! · SSSSKf ^T

ρ _{15 12} 362.3 1512362

FV Philips'Gloeilampenfabrieken My file: PHN 1599

Where

"Color image recording with limited bandwidth"

The invention relates to a method of recording and / or reproduction of color image signals on or from a recording medium in tracks which each contain at least one type of information relating to at least one field period of a color image signal.

If you want to use such a device for recording and / or reproducing color image signals, then one solution would be to record each of the η information of this color image signal as a separate track. this brings about an increase in tape consumption by a factor η.

This is avoided according to the invention in that of

all kn sub-picture information of kn consecutive Fields, where k is a positive integer and η is the number of types of information of a color image signal represents, in each case kn field information is recorded in η tracks, the η information types with a length of at least one field period always in the same order in these η tracks on the Record carriers are recorded and when playing η playback elements at the same time the Scan tracks in such a way that each of these tracks is scanned n times, the η playback elements at the same time each a different type of information of the color image signal and each one after the other all types of information in

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scan cyclically.

While this entails a slight loss of movement information, this weighs heavily for most of them Purposes the considerable saving of record carrier material, namely by a factor n.

According to one embodiment of the method according to the invention record η recording elements at the same time η types of information from k partial images and skip them then k (n- 1) sub-images, while with the simultaneous display by η display elements, each scanning a different type of information at the same time, each display element one after the other all recorded Scans tracks.

In another embodiment of the invention Method draws only one recording element in each case only one type of information of all partial images which changes in cyclic order after each field period while in playback η display elements each simultaneously scan a different type of information and each display element one after the other scans all recorded tracks.

In a device for recording and / or reproducing color image signals according to the method with η recording or reproducing elements, in which a tape-shaped recording medium is looped helically around a drum with a slot perpendicular to the drum axis, in which the recording or reproducing elements are located rotate around the axis mentioned, according to a further feature of the invention, m groups of η recording and / or. Display elements with each other in the circumferential direction of the slot each by an angle of " ⁷ ^ Q ⁰

m 909848/021 1 - 3 _

and the recording / reproducing elements each Group shifted from one another by a distance ρ a cosec a in the longitudinal direction of the tape, with m and ρ are positive integers, a is the angle between the tracks and the longitudinal direction of the record carrier, and a represents the center-to-center spacing of the tracks, with the record carrier after the yyy. Rotation of the recording or reproducing elements has shifted by a distance a in the axial direction and by an angle of almost * - = - of each group of recording or reproducing elements is coated.

In this device, the η recording elements draw during the -. Revolutions in a row η Adjacent traces of a complete color image signal and then draw during ~~ rotation not on. During this time the recording medium has shifted so far that, at the beginning of the (■ ■■■ ■ ■). Rotation, η tracks can be recorded again, which follow the first η tracks. When playing the η display elements η are adjacent Scan tracks simultaneously, after which the first playback element scans the second track again and the other elements the next tracks up to and including the (n + 1). Track so that each track is scanned η times will. With this method, the associated tracks of a partial image are generated during one of the η revolutions is scanned and with the (n-1) following revolutions a track of this original one is in each case Sub-image less and a track of a next sub-image more scanned. Although these too different The difference is that information belonging to partial images is not exactly the same as the original information but so small that it is almost imperceptible.

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^r ei fvirpr ^ rdorfin device ¹⁷ ur recording before. Pildsirnslen, dip nit a Auf ^ eichnurgseler.ent is reversed and at Ί ° γ d <=> r hand ^ örnige '.uf ^ ei obn'inge- -t-γΊ-ΐr-pT · «^ ο ^ τ ^ τΊ ^ ο ^ Ι ^Ί '■ · * ^ ^ "f ^ r ^ i ^T un a TT ¹ OT ^1-1 ^ eI. mi 1" a «delighted 7nr Trorrne] ac> ine attached slot

¹ T ¹ the armored chse is drifting around, the reiohrnrrstr ^^ er u ™ pin V. ^r inkel of almost of m recording se "! eggs spread among each other

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s un eirer ^T 7 ir ¹ ^ e] of 360 in the Umfargsri ohtunr

So ^v lit ^ es versr ^v above are ¹ ^ where m is a positive

integer u ^ :: v / obei never} ¹ An "f '^ verifiable security institutions

ι
avenge the -. Rotation of the. ^ Ufi ^ eichnungnplpmentes m οϊ ^ ΡΓ; Distance 3 has shifted in the axial direction, where η is the Ki tten distance of the tracks.

"With this device one uses m simple recording elements, v / with each? Flenert dpr one after the other eir.e srde ^ e Jn " ¹ Or ^ a ti or part is recorded in cyclical order. After -. Rotation has turned

■ Reichni3r.n: shifted by a distance, el ^e i.cj ⁿ the I-litter distance between two tracks, shifted and a new, straight next to the harvested track is described. It is clear that this type of recording is also possible with a device with η recording elements per group, with only one recording element being excited.

In such a device for reproducing color image signals, in which also a band-shaped Recording medium helically around a Drum with a slot perpendicular to the drum axis, into which the playback elements turn around the mentioned axis are m groups

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of η display elements to each other by an angle of · —— in the circumferential direction of the Slot and the display elements of each group from each other by a distance p.a.cosec a shifted in the longitudinal direction of the recording exciter, where m and ρ are positive integers, a is the angle between the tracks and the longitudinal direction of the recording medium, and a is the center distance of the Is tracks, where the record carrier is after the -. Rotation of the display elements by a distance a has shifted in the axial direction and by an angle of nearly ■ from each group of display elements is coated.

With this device it is also possible if the display elements are also suitable for recording are to use only one reproducing element for recording by energizing it and the remaining elements be left unexcited.

In this device, when k is odd, there are display elements a group by a distance of 2.a. cosec a one below the other in the longitudinal direction of the recording medium postponed.

This will make each group of display elements at the same time η tracks are scanned, with a non-scanned track between every two scanned tracks is located. This ensures that the η display elements are all either an even or an odd number Scan partial image.

In such a device, in which k is odd and ρ = 1, it is also possible to use the display elements a group scanning adjacent tracks, one below the other in the direction of the tracks

909848/021 1 - ⁶ -

also by a distance corresponding to half a distance Line time, ^ u move. This will be at the same time achieves that the playback elements of a group at the same time the tracks of either an even number or scan an odd-numbered field a.

One and the other will be explained in more detail with reference to the following figures. Ks show:

Fig. 1 shows a device with a triple recording and / or playback element, which simultaneously the records three pieces of information from only one partial image, and in which the recording medium is at an angle of almost 360 ° from the recording or playback elements is coated,

Fig. 2 the track position if k is odd, Fig. 3 the track position if k is even, 4 shows a device in which the recording medium is rotated by an angle of 180 from two simple Recording elements is concerned, which only record one piece of information each, 5 shows the resulting track position on the tape,

6 shows the track position during the recording with the triple scanning element, with the reproduction elements being shifted by half a line time in the direction of the tracks. _{r of} the triple scanning element scan three tracks at the same time, with a non-scanned track between all two scanned tracks,

BAD ORIGINAL 909848/0211

^ iγ. ⁽ λ the same as " ¹ Mr, 8, but V = 2.

^ iΓ. "* Zei ^ a ° device t to d <= r ^T? Rfir.dung, lie j of the tape-shaped recording medium 1 sohraubenlinienförmir pit around a drum 2 a is wound perpendicular to the Tro ^ m ^ -lachse 3 attached to slot 4, in which only one troop 5 of three recording or reproducing elements 6, 7 and 8 turn around, the recording or reproducing elements 6, 7 and 8 being displaced from one another by a distance a cosec a in the longitudinal direction of the recording medium 1 a the action] between the tracks 9 and the longitudinal direction of the recording medium 1 and a is the center-to-center spacing of the f.tracks 9, the recording medium moving after a single rotation of the recording or playback elements 6, 7 and 8 by a distance a in the direction of the "Ohse 3 shifted hn * and is swept by the group 5 of the display elements 6, 7 and 8 at an angle of almost 360 °. In this device, m = 1 and η = 3.

In Fig. 2 the track position is shown if k is odd, namely equal to 1. The group 5 of the three recording elements 6, 7 and 8 records three tracks, with ^ each track only one of the three color information of a color image signal, for example R, G and B, which only belong to one field, for example the odd-numbered field F ... During the two following rotations the recording elements 6, 7 and 8 are not excited, and during the fourth rotation they now record the even-numbered field Fg ¹ on the recording medium which has shifted by a distance 3a during the previous rotations. While scanning are

909848/0211

the playback elements 6, 7 and 8 are constantly switched on and they key one after the other the tracks R, G and B of P ₁ , G and B of F ₁ and R of P ₂ '* B of P ₁ and R and G of P ₂ ¹ , R, G and B from P ₂ ¹ and so on. It can be seen from this that during two of the three revolutions the display elements 6, 7 and 8 scan two pieces of information of an even-numbered field and one piece of information of an odd-numbered field or vice versa, so that special measures are necessary, e.g. to convert the information of the even-numbered fields into information via a delay line convert odd-numbered fields or vice versa. This difficulty is avoided, as shown in FIG. 3, by making k an even number, for example equal to 2, so that the three display elements 6, 7 and 8 then scan one after the other: R, G and B of P ₁ and P ₁ ', G and B from P ₁ and P ₁ ' and R from F, and P. ', B from P ₁ and P ₁ ' and R and G from P * and P. ¹ and R, G and B from F * and P. ¹ . The information R, G and B can relate directly to the signals for the colors red, green and blue, but also to the NTSC signals Y, RY and BY or Y, I and Q. In the above device, the recording medium is swept over an angle of 360 ° by the recording or reproducing elements 6, 7 and 8, where m is therefore 1; however, it will be understood that this device can readily be built for other values of m; For example, with m = 2 the recording medium is swept by these elements over an angle of 180 ° and with m = 3 over an angle of 120 °. At m = 2 there are then two groups of recording or reproduction elements which are each shifted by an angle of 180 ° from one another, whereby they are excited during half a revolution and not during the next half revolution.

909848/021 1

- y -

are excited. If m = 3, where there are three groups of recording or reproducing elements, you can avoid switching the recording elements on and off during recording by only one Group is excited. The same is true for m = 2 when only two pieces of information aaf are drawn, that is, when η = 2, where each group of recording resp. Display elements consists of two such elements.

In the type of recording described in FIG. 3, information is included at certain moments a difference of three images are combined together into a color image signal. This difference can can be reduced by using a recording method which is illustrated in FIGS. 4, 5 and is explained in more detail.

In Fig. 4, the tape-shaped recording medium is helical around a drum 22 with a perpendicular to the axis 23 is looped slot 24 in which there are two recording elements and 26 'turn around each other at an angle are shifted by 180 °, the recording medium 21 extending over an angle of almost 180 ° from each of the recording elements 26 and 26 'is swept after half a revolution of the recording elements 26 and 26 'is displaced by a distance a in the direction of the axis 23. In this device iet m = 2.

In Fig. 5 the track position is shown if k and ρ are equal to 1 and η = 3. The recording elements 26 and 26 ', which can be switched on at all times,

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record the R, G and B signals fed to them from successive fields, i.e. R from F ₁ , G from P ₁ ', B from F ₂ , ^{R from} ^ 2 *' G from F ,, B from F , ¹ etc. During the scanning of this recording, two groups 25 and 25 'of three display elements 26, 27, 28 or 26 ·, 27 ^f and 28 · simultaneously scan three tracks, for example R of F ₁ , G of F ₁ ¹ and B of F ₂ ; G from F ₁ ^f , B from F _g and R from Fg '; B of F ₂ , R of F ₂ 'and G of F ₅ ; R of F ₂ ', G of F ₅ and B of F, ¹ etc. It can be seen from this that two of the three scanned items of information belong to an even-numbered or odd-numbered field and the third information belongs to an odd-numbered or even-numbered field, so that special measures are necessary to make this information equal to one another, for example by converting an odd-numbered field to an even-numbered field or vice versa via a delay line. As in the case of the figure, this difficulty can be avoided by making k an even number; but if this is impossible, you can, as Flg. 6 shows the gap of the middle display element 27 or 27 'in the direction of the tracks with respect to the display elements 26 and 28 or 26 * and 28' by a length corresponding to half the line time t, so that the three items of information are now always displayed refer to similar partial images. A second possibility to make the partial images equal to one another is, as shown in FIG. 7, in that ρ = 2 is chosen, ie the display elements are each shifted from one another by a distance of 2.a.cosec a in the longitudinal direction of the recording medium, so that there is still a track between the tracks that are scanned by two successive elements, for example 26 and 27. Even with this device

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it is of course possible to use other values of m.

8 shows the track position in such a device, in which η = 2 and k = 1. This is possible in principle in that the brightness signal Y is recorded in one track and the color signal 0 is recorded in the other track. The brightness signal Y from F ₁ , the color signal C from F ₁ ·, the brightness signal Y from F and the C signal from F · are recorded here one after the other. When scanning, Y of F ₁ with C of F ₁ ', C of F ₁ ' and Y of F ₂ , Y of F ₂ with C of F 'etc. are scanned one after the other Way can be decoded into two separate color pieces of information, which change after each line duration in the tracks. Another problem could be that with this method the brightness signal Y is recorded only from the odd-numbered fields. This can again be avoided by choosing either ρ = 2, or that the columns of the two adjacent display elements are also shifted in the direction of the tracks by a distance corresponding to half the line time t or by choosing k = 2, in which case, as shown in FIG. 9, the following are recorded in succession: Y of F ₁ and F ₁ ', C of F ₂ and F ₂ ¹ , Y of F, and F « ¹ , C of F. and F. ¹ etc. The following combinations now occur during scanning: Y of F ₁ with C of F ₂ , Y of F ₁ · with C of F ₂ ¹ , <3 · νοη F ₂ with Y of F ,, C of F ₂ 'with Y from F- ¹ , Y from F "with C from F, Y from F ^ ¹ with G from Fj 'etc.

When recording a color picture signal according to the SEGAM system, one needs to use FM modulation

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only to modulate the Y-signal in frequency, since the O-Sipnai b ^ reita is frequency-modulated.

Patent claims:

BAD ORIOiNAL

909848/021 1

Claims (1)

Claims; 1. A method for recording and / or reproducing color image signals on or from a Aufzelchrungstr ^ f-er in tracks that each contain at least nine types of information relating to at least one field period of a color image signal, characterized by 2
that of all kn partial images in the format of kn consecutive partial images, where Ic is a positive integer and η is the number of information types of a color image signal, kn partial image information is recorded in η tracks, the η information types having a length of at least one field period are always recorded in the same order in these η tracks on the recording medium and during playback η playback elements simultaneously scan the tracks in such a way that each of these tracks is scanned η times, with the η playback elements at the same time each having a different information type of the color image signal and each one after the other Scan types of information in cyclical order. 2. The method according to claim 1, characterized in that η recording elements at the same time η Tnformationsarten record of k fields and then skip k (n-1) fields while at the same time Reproduction by η display elements, which each simultaneously scan a different type of information, each display element one after the other scans all recorded tracks. 3. The method according to claim 1, characterized in that only one recording element in each case only one - 14 9098A8 / 0211 - 1A- Tn form "tionnrrfc τ.! '» Τ? Toilet pictures * ", the .T'.irh r ..? Oh every part of the picture period changes in cyclic order, while during the playback η V / iedergnbee" learns .p ie at the same time one Other type of information. ^r ibt'i? -ter. ii ': ·] ^; each /i.ed output element one after the other scans all fHif "°", p ^{wages tf 1} » ¹ Spnrpn. Yorri ch tun'- only recording and / or playback of ^v nrbbiidsignalen. ^; : em-M? the procedure n-Tch 5. VorrLcbtur! - ^T r'.ur '-u ^p ^ eiing of according to ^ ¹ ? the procedure according to 'nsnruoh '*>. 6. Apparatus: for the reproduction of color image signals rerr ^ i? the procedure according to claim 3. 7. Device according Ar.nrruoh 4, wherein a handförmi r ^r ^ he recording cräger helices förmlr uir. a! Tromme] is wrapped with a perpendicular r ^ for Trommelachs' ¹ attached slot in which the recording or Yiedergabeelemente to rotate around the axis er.ahnte, characterized in that m groups of η recording and playback elements with each other in the circumferential direction of the slot at an angle of - and the recording - br; w. Playback elements of each group are shifted from one another by a distance pacosec a in Längsriohtur.g of the recording medium, where m and ρ are positive whole millings, a is the angle between the tracks and the longitudinal direction of the recording medium, and a is the center-to-center spacing of the tracks, where the record carrier after the -. Rotation of the recording or reproducing elements has shifted by a distance a in the axial direction and is swept at an angle of almost - by every group of recording or reproducing elements. - 15 9098Λ8 / 021 1 ORIGINAL BATHROOM - 1 ¹ S - . Claim ^c i, called a band-shaped support helically around a pine drum with a vertical drum axis angpb ^ Oi + on ^ chl ^ t "g <» Schlünden ipt, in which the on " ^ιΛ ίohrur ^ n ^ lpmpnt around the exp ? ^; th axis around- rotate, characterized in that the ^{Aufzeichrmngsiri:} "'P ^r U: pinene angle of almost -r - is of η mf ^ eiobnungselementen bestrioher to each other by an angle of in ^ mfanrsrichtunp dee: *" h l ^ tT -Pf are shifted, v / obei m is a positive number and where Pich of the recording tr Ιψβτ * ^η τ -. Fmdrp} Hin ^iT den Aiif'nioiinimfnelPinentes um m a distance a has shifted in ^ ohFenrichtiir-f, v / ob where a is the center-to-center spacing of the ^ tracks. ?. Device r> ach ^A -nf? Prnch 6, in which a band-shaped recording carrier is wound helically around a drum " ¹ with a vertical only drum-hπ * ^: attached slot, in which dip display elements around the mentioned Turning the axis around, characterized in that the groups in front of η display elements are shifted from one another in the circumferential direction of the slot by an angle of ~ j and the display elements are shifted from one another by a distance pa cosec a in the longitudinal direction of the recording medium, where m and ρ are positive integers , a is the angle between the tracks and the longitudinal direction of the recording medium, and a is the center-to-center spacing of the tracks , the recording medium having shifted after the rotation of the reproducing elements by a distance a in the axial direction and over a Angle of nearly ■ ■ ■ of;) 6 of the group of display elements is swept. - 16 - 909848/021 1 Π. .Recorded on ^ pieL'rmnrntr ^ rPf ¹ »according to the procedure imch ^ rnnruch 2 or 3. 11. Vorrichtunf raoh claim 9, in the k ungerndznhl ir TRt, rLTiuroli r ^^ pnnzei r-hrpt, da /? (Γρ V / Eachpabeelemente ro "ner Gru-npe, iev / ei ^ s around a part of? A coneo η Change in length to dgß 1ΐΡΓ. are. "■. Apparatus rp ^ h / mSarration 9, in the k odd numberJr and r> - = 1 int, characterized in that the V / each fabeelomerte" iner orupfe, the adjacent traces left inard "undo ^ ndpr ir ""'i ^ htunr the tracks are shifted by an interval, corresponding to half a line of line ^' t. BAD ORIGINAL 9098 ^ 8/021 1