DE1462010A1 - Magnetic tape recording and playback system - Google Patents

Description

PATENT LAWYERS

DR. F. ZUMSTEIN - DR. E. ASSMANN DR. R. KOENIQSBERQER - DIPL-PHYS. R. HOLZBAUER

TELEPHONE: 22347Θ and 22191t

TELEQFiAMME: ADDITIONAL CHECK ACCOUNT: MÖNCHEN 9113β

BANK ACCOUNT: BANKHAUS H. AUFHÄUSER

Dr.

S MUNICH 2.

BRAUHAUSSTRASSE 4 / III

Jüiii ΟϋΙ "ίΓΟ., Αιΐϊϋιί, 20-x.yo / Japan

Tape record and replay

give sys υ β!;: ..

The force incrang relates to an agiieiisches tape recorder and , / iedergabesysteci, un.i especially a üysten, iui an unmoved Picture, heraux-parteii. *

υ ie iirfinlimg is primarily aimed at the older.-mn.eIdUn ^; L ^^ 'Jb--]. Vorr; eLGiiiagene Aufzeielmunga- and how-i permit a rs tem to verbeoaem.

In aar

ν er v; end et en. ' üjoteüien, with which visible images

üail · :. recorded or reproduced by di'eseu ..i.o!, agiioteinrieb.bung xli axigexueiiien a bestiiamte ia'ige, una therefore a longer loan from Vi & eo-

n non-online interruption recorded for a long period of time

ne, igo, so far aufgetre.t.e> ecological

ίν-oioJUiOt wez'ueii. u.u

avoid ten, according to the invention an i-magnetic tape recorder

809803/0467

n- and playback system provided in which the G-rösae der The riagnet device used can be reduced by half can. To do this, only video signals from special Fields, e.g. those of odd-numbered Feluern a continuous series of fields., successively on one . • ■ agneteinrichtung recorded and then "wi-cd when playing back the video signal of that field successively reproduced twice, in order to get a .kiehe of signals, whose Number is equal to the original number of signals ict. • In this case, there is every frame of the reproduced signals from the video signals only the odd-numbered fields of the original Video signals, but the picture quality is practically not deteriorated because there is no noticeable difference in the information ion content of each frame of the original video signals occurs, i.e. there is practically no variation or change in the information content of the video signals of the fields of the same field of view "

The main object of the invention is to provide an improved magnetic tape recorder. and reproducing system by reducing the length of magnetic tape used during recording, accordingly the percentage of fields or image fields recorded. ■.

Another object of the invention is a video tape recorder with a device to the vertical synchronizing pulses to create.

"^ ⁰ ^ tI9 8 0 6/0467 ^ßAD

Another object of the invention is a video tape recorder, which can generate normal signals for a moving picture and signals for a still picture.

Highly an object of the invention is an apparatus of simple construction to provide a stable, normal, moving image and a fixed one To reproduce the image.

Other objects, features and advantages of the invention are provided by the The following description is explained in more detail with reference to the drawing, in which

J? Y. 1 shows, in block form, various video signal arrangements.

i'ig. ά shows schematically an arrangement of signals that are recorded on an i-magnetbana.

I'ig. Fig. 3 is a schematic view showing a. example a rotary magnetic head assembly for use in iiagnet recorders Playback ayster.i of the invention.

i'ig. , · Is a side view of the in J? Ig. j, represented

ü'ig. ^% j shows see: .a ti sen the * Lagnet, spur en, aie on a xiagnetband des in the i? ig. ■) and £ ; en jüreii aufbau.es are formed.

-ΐί'ίίΐ · ^ is a Blockdiagrai ^ a and shows a Beiopiel of electrical rule system, dao when your in 'FIG. i im; - ■ aar ^ estea.iten e ^ coxjfaufbau ver \ venaec v ^ erden i ^ ann.

i _o . ^: / eats a S ^ Ecen.diagra ^ ni and zei ^ t cciie..aticci a. jJ.el des .jagiietbaiidaufseiciiinuigs ™ u: io. • .iieue_ ⁱ gaüe; / £ jte: .i £ ae :: ·

09 ^ 0 6/04

Invention. .

Jig. 8 to 10 schematically show magnetic tracks on a magnetic:.

'' [■ band & ur explanation of the system of the invention. * ■.,

With reference to the drawing, the invention is described in detail below. 1A shows, in block form, an interwoven Original video structure, with the appropriate fields of view odd-numbered fields such as the first, third, fifth, etc., and even-numbered fields such as the second, fourth and sixth, consist.

In order to record such original video signals S, the Video signals from, for example, only the odd fields such as the first, third, fifth, etc., denoted by S ″ in FIG. 1B are recorded successively on a magnetic tape T ', as shown in FIG. Vertical synchronization pulses are inserted between the video signals. When playing each of the fields recorded on the magnetic tape 3L is reproduced twice to obtain a series of reproduced video signals S as shown in Fig. 10, where the reproduced video signals S the information content only of the odd fields of the original video signals S. ·

The basic system of the invention has been described above. In the earlier application S 9o 564 mentioned was a new one Apparatus proposed for such recording and reproduction.

80 9 80 6/046 7

, In fig. 3 and 4 is a rotatable disc 1 on a rotatable

"Baren shaft 3" attached, the shaft 3 and thus the disc ·. 1 is rotated by a motor 2. _{Two magnetic heads H a} and H ^ are attached around the circumference of the disk '1 ■'. The heads H _a * 'and H ^ have a predetermined angular distance 0 and a predetermined axial distance M, as shown in FIGS. The magnetic tape 5 is guided around a cylindrical guide member 4 with the aid of guide rollers 6 which are arranged at an angle to the direction of movement of the tape. In the in the ffig. In the embodiment shown in FIGS. 3 and 4, the magnetic tape 5 runs around eAp: 18O ⁶ amounting arc of the guide member 4, and during this movement around the guide member 4 it contacts the magnetic heads H and

With the. in the! ig. In the apparatus shown in Figs. 3 and 4, video signals consisting of an image field with gtyei fields are recorded on the magnetic tape 5 by the magnetic head IL, the recording having the SOrm of parallel oblique magnetic tracks OL, Tp: I ^, etc. as in lig '. 5, the signals of the odd-only fields can be recorded on each of the tracks QL, T ₂ , I ^, etc. by appropriately setting and selecting the following variables

Q = s speed of the magnetic head e iL and Ej ₃ j θ minute,

• 0 = angular distance between the heads H and K, _v ,

D = 'Durohmesser d ^ p Bandführungsgli.edes 4, /'. "·." ■. ^:

1 "= effective width of the

Tik; '

Because the rotary magnetic head H_ is in contact with every half revolution

el

comes with the magnetic tape 5, and the duration of this contact corresponds to that of approximately one field, the original video signals from fields such as the first, second, third, etc., as shown in Fig. 1A, are selectively so recorded that only the odd-numbered fields, such as the first, third, fifth, etc., are recorded on the magnetic tape 5, and on these form the magnetic tracks 3J ^, ΐ ₂ »ϊϊ, etc., as shown in FIG. 5 ¹ Ig. 1B By appropriately selecting and dividing the above variables, only every second field is recorded. A comparison of FIGS. 1A and 1 shows that the odd-numbered fields were recorded, while the even-numbered fields were unfortunately suppressed the odd-numbered fields are suppressed and the even-numbered fields are recorded.

During playback, the magnetic heads H _a and ik would _{cause the magnetic tracks S 1} , I ₀ , S, etc. on the magnetic tape 5. This registration _t is made by suitable selection 'the distance M between the heads H_ and Hx.' performed, as shown in Fig. 4 * Therefore, the reproduction of the magnetic head _E track I ^ tastetbei from, thereby the video signal of the first _o ffl <lep reproduce, and then the other magnetic head BL scans the same track 3L from, thereby the

: To reproduce the video signal of the first field »Thereby

, ..> sg ^r ib% a perfectly reproduced, composite

λ signal, as shown in FIG. 10, ie two first image fields, * ■ '", ■■■■' ^v

third image fields, two fifth image fields, etc. Ia Fig. 1D

6/0467

in the

1462Ö1 ο

.rtig · is ** tj (f ^

. add signals

to _: forms ^ A.

; 'With 4s - iM§ $ 04 Feldir des

lying, fe ^ tit ^ ip ^ M ^ imltrll ^ lp'r ^ -i ^ ier. Reproduction © :; ~ ye $ §MM ^; die4ufgö # ti | he ^^: ^ || #r 'M ^^^ J; l | i | ^ gigeben, im ;; ^:. 3j | ^ jt ^ * aierlioheß ^ ttlteifel ^^ to " ^: tr || ^ | ^^ ^<o i # lj | n duration moving | ^{ii: ftäiv-:} v $ of Originiii.f "ldi <| prop ^ tt $ | .. | (.iiöt # ΐ ν - ,,? _r >'■ V. ■ ί

shown,

Signal. joint site

herds only atiwecnsfeliid '. · " and the

The throwing marks ^ ii ^ en-fte. d ^^ Ü ^ le »: 'Fig. .3 · and 4 d'a ^ © .stiilH ^

ten ^ ehmagnetk ^ | if & ufbau siiii / $$ i &: $ p% g $ pjlent ■ "^

'■ ■■ ■ r ■■■' ■■: ■■; ■ 'V ■ - ■■■■:.; - ■■■ .-; ■■ ■ ■: - ^:. ■ -. ■: ■. ; -Ή

»-Ti ^: vf: i ;; v ;. '^. ^; Ä |

'V *' ■ '(£ &&. F';':ΐ> Υν. ■' ■ '■■ V-:.;:. ■.> V {I

In this case, F is the frequency of the external field atif gedel ";
Magnetic track, η is, <| ie number, the ^ iiite'tköpf e, ¥ the distance;
neighboring Spu ^ in * P the distance between the Aiafangspurik'frgft
from neighboring §puren and D ä t iferchmesser the BanafÜhriiag · | ^ Ι ^ The .riablen £ UN4 M are the BfeinigungeÄ, dabs the Jiagnttkipjff ^ in re Gabi and -de ^ '- ^^ f ^ ichnupg same Üünelr-'"ΐ - '^ ν, ι ^^ ΙΑ ^^ ι ^^ κ ^ -. ^^ Ι ^ ΙΛ & η are in a <2 & / ~ BM.g «SU

ims ^

4 and 5 shown. In a typical device, for example, · η = 2, F = 60 Hz. ^{, 0-170 °, K 0} a -10 ·, M = 0.6 mm and D - 80 mm «[V

■ In Fig. 6 the bloek diagram for the electrical circuit 'ί is shown, the "in the shown in Figs. 3 and 4 for- ■' VJ,

* ir direction is used. In the recording of .werden '; optionally, a video signal source 7 broadcasted video signals on a * "j frequency- or Sasenmodulator 8, to obtain the conventional modulated signal" Bas modulated signals it from', ■ the amplifier 9 and the contact 1OB. Of a switch 10

it

_{m given} the magnetic head H _& . % & is / is desired to reproduce the recorded "signal, the reproducing output of the magnetic head H 'is applied to a mixer circuit 11 via the contact' 1OP of the switch 10. The signal from the head 1EL is also applied to the mixer circuit 11. The outputs ^ seP ^ xAXSgSSseJCCC of the heads BL. and HJ ₃ are thereby mixed by the mixing circuit 11, and both ^ output signals are then given to a demodulation circuit 12, from which the desired reproduction output is given to a terminal; 13. Hit the in the Pig. 3 and 4, the video signals are only recorded on ^:

given the ilagnetkopf ü, but not on the liagnetkopf H,.

. ■ * ■ jjalier only the video signals of each second field recorded by the iiagnetkopf H _a on the magnetic tape 5 to form on this i-jagnetspuren ^r IL, T _2, T _x, etc. as in Fig. 5. During playback, the ^ .iagnet traces [iL, ΐ _? , T., etc. 'successively scanned twice, each once by the magnetic heads - ~~~ • H _a and Ii-J ₃ . Therefore, only the video signals of every two-th field are recorded, and therefore the length of that is never used

8 0 9 8 0 6/0467 8AD ORIGINAL

BandeB reduced by half.

During playback, however, the γοη overlap the magnetic ■ head H and H, -played video signals in time at their Start and end points so that when the two signals come together are given to the mixing circuit 11, beats arise between the two signals, whereby a in the output signal Floating noise occurs. Since the beat noise in the Tertical synchronization period is generated, so the synchronization comes out of step.

in order to avoid this, a device 21 is provided according to the invention provided for generating pulses, which is arranged around the rotating shaft to thereby additionally produce vertical synchronizing pulses to obtain. The additional vertical synchronization pulses are converted into a series of video signals from the output terminal 13 brought to stabilize video signals with fcsasiaicfesiüfC. to receive vertical synchronization impulses. 3? Ig. 7 shows a system diagram to illustrate the additional vertical To enter synchronization pulses into the video signals / Ligur are parts that are similar to those of the. Fig. 3, 4 and 6 are denoted by the same reference numerals and iij. this description cannot be explained in detail "» '- Au'f'

' ' ■ - the rotary shaft 3 is, for example, a turntable 14 attached;

• ■ - - *. *: ' Circumference magnetic pieces i £ a and 15b in one turn

360 ° / n or iöO ^p are arranged in this example,

/κ.γ^λαα, v-t .- ,,. ν

1462OtQ,;

- ίο -

17 is secured with ein.er pickup coil 16 to the iPührungsglied 4, a recording head, said this- head a pulse is generated in cooperation with the magnet pieces 15a and 15b whenever the magnetic heads H _A and H ^ corresponding to the vertical synchronization signals on the magnetic tape S recorded, play back. The pulse generated by the head 17 is applied to a pulse shaping amplifier 18 to obtain an additional vertical synchronizing pulse, and the additional vertical synchronizing pulse is then applied to a composite circuit 19 provided after the output terminal 13. As a result you get video signals at terminal 20 with additional vertical synchronization • pulses or a vertical synchronization pulse, combined with the additional vertical synchronization pulse.

By using the system described above, video signals can be reproduced, the constant (stabilized) vertical synchronizing signals have further according to the invention can also use the so-called still image signals are reproduced at ¹ using the above-described playback. · Systems,

; , With reference to lig, 5 a description has been made in conjunction with

• The magnetic track formed on the magnetic tape 2 _{& is} given. Bi e,, * "Magnetic track is used in connection with " Sig. 8 in single

, newly described * In Fig. 8, in balanced lines i! ' Magnet-. ^fc ^ -> acidic f _At Io »Ϊ · * u & w. · illustrated, the gum purposes of illustrative-"

6/0487

tion ver. Band £
Band des ... eiriem W

is gofrrä on the

"■■■

& yerlauf t Μφχ -dem Apsohnitt AB at the top

■ ÖD ßk ifat & cen volume of the volume in f

from the point of the hormones:

above".'

le «*:

air rank of the band,
G.' 5 described /, furthermore is a
h i & Bohnitt ^ / j || S ^ $ 2 $ iohnet. _f and the
t E denotes * % in vertical Syhchronisief dei ^ Ieil B ^ '- ^ kfgeBöäjbhnet, that perpendicular to
Γοί-fe AO verL ^ L ^ / - | m following will be the "Wieäei ^ - Tmlaewegte4; | ^ lisignale from the

durah dt @ ^ gnetäföpf e K ^ and H ^. '^ esbhrieben when the: r magnetic tape * ¥ ^ ni ^ JoNt the mLi $ jjkQi! B & ' Pjoskt O ^ the track Q-. If the upper tape 4 of the magnetic tape T coincides exactly with the middle pipe 0 of the magnet, the spxir 0 ^ runs roughly into one, 'angle Θ', d4r smaller than the angle θ is, vqm AWscämitt A-JB ^ on the upper hand of the magnetic tape SL down to the section Ö-.D, on the lower sand, with its middle point exactly; iait'dem middle point P-. on the lower hand between the m ^ ne% gpuren OL and ^ Φα Corresponds. On the other hand, the 'Sp ^ ir Q of the magnetic head H runs obliquely at an angle Q * from the absolute AB on the lower hand of the magnetic tape ΐ ^ whose center coincides with the center O _& on the upper band between the magnetic tracks Io and T ^, downwards to the section CD aa'Tont-eren band * whose center point P _& coincides with the point P of the Magj & et ^ pOX 'tD ₂ .ei ^. That way you can

d, ureji die. ^, ^ # | heads E and Η _{Ή againgehea}

di © Magnets pair In

ä ^ | 3 $ agnetspuren and the not, mag-

- 12 -

netized ropes in the width ratio 2s 1. * Accordingly, the end point of the track Q- ^ overlaps in this JPaIl of the magnetic head H, that of the magnetic track OIL, during the The starting point of the track Q of the! Magnetic head H_ corresponds to that of the

Or et

netspur I * overlaps. However, since the two magnetic heads H and H, the 'magnetic track', which is practically a single line the so-called still image signal can be reproduced. · '

However, the vertical synchronization signal is recorded on the magnetic track Ip ^ ^η a position which is a distance Ii from the center of the track 'Up ^{on the} upper edge of the magnetic tape T. V / hen deiugexuäss in the track. the vertical synchronization signal is reproduced by the head E at a time corresponding to the distance L _& , while in general the spar X3 _b aaö vertical synchronization signal is reproduced by the head H at a time corresponding to the distance L-. corresponds to, where this is different from the distance L. This will be

el

the vertical sync signals are reproduced at different times. Therefore, when the still picture signal is obtained and an additional vertical _S-t Tnchronisierungssignal einge- closed by the .Impulserzeugimgseinrichtung 21 in the video signal, v / ie i: u connection nix i'ig. 7 described, the reproduced image is unstable in a vertical clearing, since the vertical synchronizing impulse deviates strongly from the vertical synchronizing signal reproduced above in the case of neaen Jj'eld. x ».h. , aas iiila moves cioii up and down. Jies stems from this nex, 'aas ^. der uiniielabotand 0 sv.-iscLen cen x ^ gnetköpf ή

BAD ORIGINAL "^ ■ 80.9806 / 0467

H _{13 is} 180 ° + Σ. .

In order to avoid this part, according to the invention, the magnetic tape T is started during playback, whereupon the magnetic heads II and EL move at the same speed as during the. Rotate the recording in order to reproduce the still image signal. In this case, the vertical synchronization signal in the reproduced video signal is fed from a demodulator 12 to the output terminal 20 in order to use it without the pulse from the pulse generator 21 being given to the mixer circuit 19. In this way, extremely constant (stabilized), immobile image signals can be generated during normal playback without the vertical synchronizing signals becoming unstable and. ^: during the reproduction of the still image signals, these can be easily reproduced if only the line from the pulse generating device 21 to the mixing circuit 9 is interrupted «

.Fig. 7 shows an example in which a switch 22 is provided is to contribute to the additional vertical sync pulses reproducing the still image signal between the pulse generating means 21 and the fiischkreis 19.

Vewa. the axial distance M between the. , Magnetic head en. IL and IL W / 2 is, as shown in Pig, 7, the magnetic heads H _a. And R ^ scan exactly the same magnetic tracks during normal playback, but when a still image is played back, neither one or both scans Simultaneously adjacent 'magnetic track eil, ζ.Β,

JOi,

I .. and. Ig »off. Accordingly, it is possible here that in the a beat noise is generated on the reproduced signal, thereby deteriorating the picture quality.

In order to avoid this, according to the invention, the axial distance M between the magnetic heads H and H is selected so that a distance M ¹ results which is smaller than W / 2. At one of the-. like arrangement shifts when the magnetic head H _& scans the magnetic track Ip, as in S ¹ Ig. 9 shown, in normal playback, the track C ^, the magnetic head H, in the direction of the magnetic track T ^ and parallel to this. However, it is possible to obtain an image without beat noise by selecting the distance M so that the magnetic head L cannot scan the magnetic tracks OL and Ip simultaneously, and the tracks Q _a and Q overlap during reproduction of the still image , the magnetic heads H and H, the magnetic tracks OIL and I ^ not, as in Pig. 10, so that no beat sound is generated and a steady image can be reproduced.

It is clear from the foregoing that, according to the invention, Because image signals can be obtained by using a system

can the length of the magnetic tape used iryaem on - half can be reduced and can be prevented in such lall comparable · that vertical Synchronisierungösignale.

become unstable, and thus a still picture without safe boy noise can be achieved. Accordingly, the # Irfi & aüng can be purposeful—

809806/0407

massive at eisieia such Ma ^ netviäeoaufzeiohnungs- and Playback system can be used

4- ι »*

While the invention is described with reference to a system

was, in the video signals of each. ^ wide field magnetically T \ drawn and / barren be reproduced, the invention ■■ * may be used in other Systemem in which Videosig-

Q -ι · »α ο · prj ÖVl"] "f *

nale of any desired field or. Field of view aarjmriwt: herds. In this! "All means Q = in the above equation

to be selected '

the factor P is the frequency of the χ ^^ $ Χΰΰ®3 && Ά suffering or image feeding.

Many modifications and variations can of course be made without departing from the scope of the novel conception of the invention.

Claims (1)

Pa ten tans ρ back 1.V Magnetic tape recording and playback system, consisting of a plurality of heads, an execution for that plurality. turning of heads, passing out a recording medium, a Einrich- · ■ tung to this recording medium at the heads, \ a means for additional vertical Synchronesierungsimpulse accordance with the rotation of the heads to produce, a ■ where. not all of these heads : Circuit, 3ßS £ when recording a »« 5ffiä3 ^ operated v / earth ££%, which means less than record the original visual image signals, one Means for scanning all of these signals recorded on this recording medium with all of these heads when playing, thereby creating a continuous train of reproduce visible image signals, the duration of which is identical to the originally present visible image signals, furthermore with a device in order to reproduce these additional vertical synchronizing devices during playback on them to abandon visible image signals. 2. i'iagnetband recording and playback system according to claim 1, characterized in that a device is provided through which the "agnetic" successively follow the same path on the recording medium scan, whereby still image signals -. are given; that further a device is provided to _B09806 these additional vertical oynQhroaisierungsimpulse "in the Turn off playback of these still image signals. 5. i-iagnetbandaufzeiohnungs- and Wiedergäbest star according to claim Z, characterized,. that the still image signals were recorded vertical synchronization impulses including 4. Magnetic tape recording -um. Iv'iedergabesystern according to ^ aioprach 2 or " 5, characterized by a device to arrange the heads in such a way that they are better 8 0 9 8 0 6/0 β $ .7