DE1512104C - Electronic editing system for a spiral scan video tape recorder and playback device - Google Patents

Description

The invention relates generally to the correction of video signals recorded on magnetic tape and in particular an electronic editing system for a spiral scan video tape recording and playback device.

The correction of spirally scanned videotape recordings has hitherto been carried out mechanically been. The tape was cut, leaving segments to produce a corrected tape spliced together. Apart from physical disadvantages, which can be seen in the implementation As a result of such a mechanical cutting operation, it is practically impossible to achieve perfectly smooth Maintain tape edges at the splice point. As the spiral scan during recording and playback scanning operations depends on the edge guidance, results from the edge disturbances of the mechanical Splice typically a picture disturbance in the displayed picture.

The electronic correction of spiral-scanned video tape recordings results in essentials Benefits. The electronic correction is essentially carried out automatically and quickly, while the belt is moving at normal speed. It also arises from an electronic Splice no edge inaccuracy. Although an electronic editing arrangement has long been used in the correction of transversely scanned videotape recordings is a broadcast on spirally scanned recordings because of the difference in the geometries of the recorded ones Signals not possible. The recorded tracks of a transversely scanned recording deviate only slightly from the transverse direction and are therefore essentially vertical. Therefore, a vertically oriented erase head can be used to erase a selected one Segments of video information recorded on the tape. The erase head is around one predetermined distance in front of the video heads. By applying a time delay to the Program excitation of the video heads with the new video material, which corresponds to the time that the Tape needed to move the specified distance, recording the new material will be accurate started at the beginning of the deleted segment. However, the tracks are scanned in a spiral Recordings are essentially diagonal and run at a large angle against the transverse direction. For this reason, the tracks are very long. The beginning of the deletion of a tape segment in the Space between its tracks cannot be carried out by a vertically oriented erase head will. The use of a diagonally oriented erase head is impractical because the head is a must be of substantial length and its precise orientation is critical. For these reasons is a Electronic editing system that is suitable for transversely scanned videotape files, for spiral scanned recordings unsuitable.

Hs was found to be the electronic correction of spirally scanned video frames can be carried out using the following procedure. Kur /, said, is doing a deletion of a video signal recorded on a magnetic tape, while simultaneously generating a new video signal is recorded on the erased part of the halide, with no use of an erase head is made. Specifically, a new video signal is placed directly over an existing video signal recorded on a magnetic tape, with the exact matching between the high-frequency carriers of the corresponding signals is maintained. This is achieved by the fact that the Kapstan- and the head drum drive servo system of the video tape recording and reproducing apparatus in the reproducing mode is held while the video electronics of the device switched from playback to recording to initiate the recording of a new video signal on top of the previously recorded signal. Overwriting with the new signal will result in a high degree of erasure of the existing one Signal reached; there is only a small allowable amount of high frequency interference during playback of the new signal. This procedure is also with a perfect »LangeinsatZK correction operation Erasure of the tape by a video erase head usable, which in relation to the Direction of tape movement in front of the head drum of the spiral-scanned video tape recorder and player is arranged. "Long-term use" is understood here to mean a use which covers a band area occupies which is greater than the distance between the video erase head and the head drum. Included the video electronics switch to recording mode at the same time as the video erase head is excited switched. Initially, the new signal is picked up directly over the existing signal so that a small amount of interference is included. Then there are the recorded tracks of the new signal on progressively increasing parts of the tape which are completely processed by the erase head are deleted; after all, the recorded tracks are on a completely erased one Tape. The interference therefore quickly decreases to zero. A »short-term corrective operation, d. H. an insert which occupies an area on the belt that is less than the distance between the video erase head and the head drum, is performed without erasing by the erase head; the new signal is simply recorded over the existing signal.

It is of course desirable to have "long-term", short-term "and other electronic corrective operations according to the method described above under the control of an operator can be carried out selectively in an automatic manner.

The present invention has therefore set itself the task of an electronic editing system for a To provide a helical scan video tape recording and playback system capable of a number of different selected corrective modes under the control of an operator automatically are.

As part of this task, the electronic Correction system a new video signal is inserted into or to an existing tape recording can be added; the collection at a llaupthaud should continue to be made easier, with only minor interference and thus a high one Accuracy occurs on the corrected transitions. Hs should for all selectable Konekliirbelriebsarlen of the system a / eitbe / ugskoiilinuiliit to the corrected Transitions are maintained. In addition, the electronic .Sehnillsyslem should be a visual indication of the execution of the selectable

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Have correction modes. Finally, the selector switch is supposed to be in the "Normal" -Betricbsart-Toggle the electronic correction system prevents the tape cut recording switch from being set that undesired empty spaces in the corri- logical circuit are decoupled, that the logical yawed uptake occur. Switching when the tape cutting mode is set an electronic editing system for a 5 selection switch in the »Kurzcinsatze-Betricbsart-spiral scanning-video-tape recording- and playback switch position has a through-connected Schaltcinheitcngerät with rotating tape supply and recording combination, which - as a function of spool on a plate, one of the trigger impulses recorded on the plate - the video tape Spiral scanning arrangement, which excites a guide receiving part and - as a function of a two-way for guiding the magnetic tape between the io th pulse of the trigger pulse - the excitation of the Supply and take-up reels in a spiral-shaped video recording section interrupts that the logical Wrap around at least one video high frequency circuit upon setting the tape cut mode sequence head having rotating head drum on selector switch in the "long use" switch position has, a drive assembly mounted on the plate, a further through-connected switching unit combination assembly with a Kapstan shaft for the movement of the 15 nation, which - as a function of a first Tape between the supply and take-up reels, pulse of the trigger pulse - at the same time the a video recording part and the video extinguishing oscillator in drive connection with the Kapstan shaft Kapstan motor, one with the head current- excites and - as a function of a second pulse of the with the drive-connected head drum trigger impulses - the excitation of the video erasure oscilloscope motor, a driven by the head drum 20 lators and after a predetermined time delay Tachometer device for generating which interrupts the excitation of the video recording device and Head drum position corresponding speed pulse - that the logic circuit when setting the tape, a cut operating mode selector switch attached to the plate across the tape in the »collective« - th video erase head, which with respect to the tape mode switch position through a third through-movement direction in front of the spiral scanning arrangement 25 dene switching unit combination, which is arranged, one with the video high - as a function of a first pulse of the trigger frequency heads coupled recording part for Aufimpulse - at the same time the video recording part and would take a video signal, one excited by the video-erasing video-erasing oscillator, the second input Head-coupled video extinguishing oscillator for feeding the head drum servo system with one source Solution of an erase current in the video erase head, 3 ° one derived from the video signal to be recorded a vertical sync signal coupled to the head drum motor, the output of the Head drum servo system for controlling the head capstan servo system with a nominal speed drum motor as a function of a head drum keits reference potential connects the second input Error signal, which unite by comparing signals at the capstan servo system with its output first and second input of the head drum 35 binds, as well as the control track head of the second one-servo system is derived, one switches off with the Kapgang of the Kapstan servo system and him stan motor coupled capstan servo system to connect with the tachometer device and Control of the capstan motor as a function of which - as a function of a second pulse of the Kapstan error signal obtained by comparing Si trigger pulses - the excitation of the video recording signal interrupts at a first and second input of the 4 ° part and the video extinguishing oscillator and Kapstan servo system is derived and with a second input of the head drum servo system on the disk attached control track head, which reconnects to the reference signal source, the for recording a control track on the tape or output of the capstan servo system from the denominator Play a. Rogelspur from the tape disconnects the tape speed reference potential is arranged adjacently, the pre-45 second input of the capstan servo system is desnanntcn for the solution Task provided according to the invention, sen output switches off and the control track head of that a tape cut mode selector switch with the tachometer device turns off and him Selectable »normal«, »short-term use«, »long-time operation again with the second input of the capstan servo set« and »Collecting operating mode switching positions systems connects.

it is provided that the tape cut operating mode 5 ° Further details of the invention result

Selector switch a tape cut recording switch from the following description of execution

is coupled, the trigger impulses rungsbeispiclen when actuated on the basis of the figures. It shows

on the tape cut mode selection switch, Fig. 1 is a plan view of a conventional one

that a logic circuit for coupling the spiral scan video tape recording and playback

Sectional mode selector switch on the 55 devices in which the electronic information cor-

Video recording part, the video release oscillator, the rectification system according to the invention can be used,

Head drum servo system, the capstan servo system, Fig. 2 is a schematic circuit diagram of the electronic

the tachometer device and the control track - already Iiiformationskoirektursvstenis,

head is provided that the logic Schallung a Fi g. Λ a graphic representation of a »long-term

the first time the Köpftrnmmel-Scrvosystcnis ^6o salt ", which through the electronic information

ulid ilen first input of the Knpstati-Servosystonis CORRECTURSYSTENi on a video magic tape

Ab- is connected with the Drehzalilnessereimmachunji, and

nahinekopf, an ilen / wide Ι '! ίιιι>: ιιιμ of the head Fig. 4 is a graphic representation of a Sanimel-

li'oinniel-Scrvosyslenis normally with an insert, which by the electronic Inl'orinazugssignalquelc connecting belt unit and a 65 tion correction system on a video magic tape.

the second outlet of the Kapslan servo system is normal.

uially connecting with the Rcgelspuikopl 'In its fundamental aspects, the lirliu-

As a rule, that the main line of communication contains an electronic error correction system

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for use in spiral-scanned video tape-up signal during recording over the latter acceptor before to close the selective insertion of. According to the next actuation of the _; With a new video program at a predetermined tape cut switch, the logic points of an existing video tape record to circuit make it easier to switch off the video recording part, whereby the continuity between the respective signals is maintained. The editing system If the operating mode switch is in its "Long contains a device for selective feed set" position, it switches on the logic switching of the desired video signals in the video recording in such a way that when the tape editing head or the video recording heads of a sound recorder are operated, a " Long-term Correction Operational Scan Video Tape Recorder when pre-io tion is effected. Just as in the case of given points on an existing video tape, the video recording part recorded will be located in the area of the head. It is switched and the Kapstan- and Kopftrommcl-Servowciterhin a device for selective actuation systems in the playback mode, a video erase head of the recording device in front Video, tuiig of the tape in front of the video head drum across the erase head. This creates an initial splice; Tape is arranged; the actuation of the video erasure is caused, in which initially a partial clearing of the head takes place essentially simultaneously with the extensive erasure of the existing signal I of the supply of the video recording head. The system by directly overlying the recording of the new is further designed to produce the video recording signal; thereafter, the new heads in a predetermined delayed relationship signal is progressively recorded on the tape that has been selectively completely erased by the video eraser to turn off the video eraser head, switched so that the recording is terminated If no erase is actuated, the logic circuit switches the gap on the tape. The video erase head is still off Back-head drum servo systemc of the recording and laying the distance between the erasing head and the playback device during the recording of the new head drum is required, the video recording part signal is kept in playback mode or switched off, thereby recording the new Si.; Your tape selectively record a return track, 30 times ended on the tape wi approx. Thereby manufacturing j which both the herein are subject to "r recorded as pre called Endverspleißung is essentially a j with the added signals in Synchronis- inverse counterpart of ^{Anfangsverspleißung.!} Mus is. Thus, the possibility is given that there is the Bandabschnittbetricbsart- If the new signal is sent directly to the old selector switch in its "collecting position, it closes, so that in accordance with the proposed method described above the logical circuit as a function of actuation, the deletion of the tape cut pick-up switch leads to a" collecting " - the old signal "is restored" simultaneously with the up-correction operation. The first actuation of the; would take is made of the new signal. "The switch triggers the logic circuit such that j Aufrcchtcrhaltung a correct time reference to be corrosion-operated video recording part and the video erase head! rigicrtcn transitions between recorded Si 40 simultaneously. At the same time causes the lo- I gnalscgmcntcn is This also facilitates the writing of a new control circuit for carrying out the various correction operation signals on the tape. For this latter purpose, the correct interacting error signal is used, which is normally used to operate the aforementioned devices by regulating the capstan -Servosystcms in the re- ύ cine an associated logic circuit brought about, 45 output mode of the device is used, from which this servo system is decoupled by a tape cut mode selection input; at its switch and a tape cut take-up switch place a constant signal, which is the denominator. The selector switch has the selection belt speed that corresponds to the input that gives the barc »normal«, »short duty«, »long duty« and this servo system. At the same time, the "Sammck operating mode. The setting of the 5 ° control track head in its recording state switched the selection sounder to its »normal position and decoupled the logic circuit from the recording part to the head drum speed table for reception, by knife. The control track head therefore switches off the correction system, so that the up-speed pulse can be used as a new control track on the tape recording part in its normal recording and re-recording, so that the tape position can be used during playback. 55 of the new video material. In this way, if the selector switch is in its "brief operation" - if a phase adjustment is made between the original position, the logic circuit through this control track and the start of the new control track is switched on in a suitable manner in order to hold. When the cut tape recorder switch is operated next time to operate the tape recorder operation, the logic switch turns on a shortcut correcting operation 60 circuit to perform the video recording part and at the same time. As a function of a first actuation, the video erase head is switched off and the tape cut record switch is switched on, the video capstan servo system and the control track head in their recording part of the video electronics are switched on in order to restore the original playback conditions, the video heads with a new video signal. The Kapstan switches in one of the aforementioned switch positions and head drum servo systems are located accordingly, so the logic circuit is kept in a playback mode so that the sound recording part of the device is switched on so that the new Signal exactly to the existing one in order to erase parts of the original soundtracks

1 512 1C4

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and record audio signals which offset the supply reel 19 to the new direction. The videotaped person Include video footage. , erase head is arranged adjacent to the belt path in this way

To describe a preferred embodiment that it extends across the central part of the die shape of the spiral-scanned video magnetic tape recording - tape containing diagonal video tracks and playback device as well as one in the above 5 stretches. One. Head stacker assembly 42 is on top of the basically described electronic tape-disk-in one in relation to the tape motion direction cutting system should now the F i g. 1 and 2 considered device located behind the scanning arrangement 22 which a device and the associated cor- position are attached; this head stacking system show. The one denoted by 17 in FIG. 1 is located in the middle between the scanning arrangement The recording and playback device is essentially io and the take-up reel 21. The head stacks align Conventional type, the device contains an order contains a Tonkopfstapcl 43, which for Plate 18, on the supply and take-up reels 19 selective recording or playback of audio tracks and 21 are rotatably mounted; these coils ren lengthways along one edge of the tape have a longitudinal distance from one another. In which is provided. The head stack also contains the middle between the supply and take-up reels there is a 15 order control track head 44 (see FIG. 2) a spiral scanning arrangement 22 is provided which, when recording or playing back a Rcgelspur in the illustrated embodiment a hollow cylindrical longitudinal direction along the other edge of the belt, has drical guide 23, in which a rotating When considering a bcvorzug-

Head drum 24 is assigned. A magnetic tape 25 th embodiment of the in Fi g. The basket shown in FIG. 2 runs from the supply reel around a tensioning system, it should first be noted that the setting arm 26 and an input guide pin 27 take and reproduce device 17 in a conventional manner to the scanning arrangement. The tape runs in a manner a recording part 46, a sound recording part helical turn of 180 ° around the cylindrical 47, a video erasing oscillator 48, a head drum guide 23 and then around an output guide servo system 49 and a capstan servo system 51 pin 28 as well as between a Includes Kapstans 29 and 25. The video or The audio recording part is connected to a pinch roller 31 on the take-up reel 21. A video high-frequency heads 33 and 34 or to the motor 32 (FIG Movement of the erase oscillator tape to the erase video head 41 is angckop between the supply and take-up reels in a pelt. The video and audio signals are brought into the spiral loop via the guide 23 of the radio frequency heads 33 and 34 and the audio head probe assembly. Furthermore, stacks 43 of the receiving parts 46 and 47 in disguised motors are not coupled to the supply and receiving dependency of a feed reel provided thereon, in order to feed unwinding and receiving. The video erase head will generate an erasure current with the tape pulled by the Kapstan wave, depending on the pre-excitation. At the periphery of the drum 24 a 35 of the extinguishing oscillator 48 is fed.
Pair of high frequency video heads 33 and 34 on the head drum servo system 49 is for control

diametrically opposite points in front of the head drum motor 36 switched on while see; a motor 36 (see Fig. 2) is in driving the capstan servo system 51 for control of the Connection coupled to the drum to this capstan motor 32 is switched on. In this regard opposite to the direction of movement of the belt 40, the scrvo systems generate motor rcgcl error signals in order to make the cylindrical guide 23 rotate by comparing the decontamination rates of the rotary counter. For every 180 ° rotation of the head drum, head 39 scans the generated speed pulse with a difference one or the other of the heads 33 and 34 the NEN selectable reference signals which of the through spirally wound tape diagonally to perform a functional operation of the device 17 Record or play back a track. Thereby 45 kind depend. The device 17 includes not shown a head begins scanning the tape in the device for appropriate related Moment when the other head finishes scanning the actuation of the various elements of the tape. So in every revolution of the recording and playback device to execute the Drum scanned two tracks. In addition, functional modes of operation in accordance with are diametrically opposed magnetic 50 of the setting of a tape cut mode off inserts 37 and 38 selector switches 5-6 at locations in the drum. The switch contains playback beds, which a suitable angular distance from and receiving contacts as well as further contacts, have the heads and relative to a rotary which, for the sake of clarity, is not a magnifier removal head 39 are so localized that are placed; these contacts are through a dialup then a Drchzahlimpuls is generated, 55 arm 48 can be connected to the bias + Kl. the if one of the recording heads has a track on the bias + Fl is therefore selected on the The tape begins to feel. The Drchzahlimpulse ent- switching contact given to a not shown speak of the instantaneous position of the head circuit to operate and the elements of the reel and are conventionally auditing and reproducing devices for executing the applies to control a servo control of the head drum and 60 corresponding functional operating mode, to ease the Kapstans, so that a high if. For example, the switch 5-6 is in the degree of time reference stability in the reversed position, with the selector arm 48 at the input is achieved. There is receiving contact, the video erase head 41

On the disk 18 is also a video erase head with an erase stream and the video and audio 41 fed with signals to be recorded at a point adjacent to tape 25 in 65 acquisition part, With respect to the direction of movement of the band before the Ab- Simultaneously, the head drum and capstan assembly 22 arranged; this head is therefore fed to the servo system with suitable error signals, in other words against the scanning arrangement in order to increase the speeds of the head drum and the cap-

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stans to regulate constantly. The control trackhead 44 is connected which is adjustable to feed a time to achieve a control track on the tape that corresponds to the time that to take. the tape to cover the distance between the

When the switch 5-6 is in its playback position video erasure head 41 and the point of the scanning arrangement, the selector arm 48 on the playback 5 requires the contact between the heads 33 and 34, the video erase head is switched off on the tracks Start to scan the tape. The circuit tet, wherein the video high-frequency heads 33 and 34 57 preferably contains a variable resistor .such as the audio head stack 43, the tape end signals on 58 and a parallel capacitance 59, which between the video and sound reproduction parts, not shown, the contact of the bank513-D and the Give pretension. The control track head 44 reads which are switched on the tape ίο - V 2 . The connection between the recorded control track, where the control track-resistance-capacitance combination and the signal is used to generate suitable error signals for switching contact is via series-connected transistors, which on the head drum and Kapstan stages β 1 and Ql to the can be given at the switching contact 2 He servo system. This means that the head end of the relay K 20 is switched on. The counter drum and the capstan are pre- 15 bar 4 of the switch bank 513-D is with a collective position. These "normal" operating modes relay K21 , which in turn is connected to earth, are connected to a recording and playback device. The contacts 4 of banks 513-D and 513-C are conventional; The selector arm 54 of the bank 513-C is shown in detail with the dependency of the settings of the switch S-6 ao excitation input of the video extinguishing oscillator 48 and described. bound.

For the following more detailed description of the band- A normally open contact K20-D des

Cutting mode selection switch and the associated holding relay K 20 couples the playback contact to the logic circuit of the correction system, a selection switch 5-6 with a recording relay must next determine that the tape cutting mode 35 K6, which in turn is connected to earth. A normal selector switch 513 five with A, B, C, D, E designating open contact K6-D this relay is networked has banks, which have four selectable, as applies to the bias voltage - V2 with an adjustment 1, 2, 3 , Have 4 designated contacts. To connect delay circuit 61, which causes a relative To each bank one of several equally short time delays that are sufficient for stabilizing the selector arms to make contact with the contact of the components of the video recording part 46 clock positions 1, 2, 3, 4. The delay circuit 61 preferably contains

The selector arms in banks A, B, C, D, E are wise a transistor amplifier stage β 5, which is designated on a correspondingly with 52, 53, 54, 55, 56. The side of a capacity 62 lies. The other side of these switch positions 1, 2, 3, 4 of the selection switch 513 capacitance is connected to earth. A second capacitance 63 represents the "normal", "short-term use", "long-term" 35 via a normally open contact K21-B of the "use" and "Sammck tape cut modes"; Collective relay K 21 with a capacity of 62 connected in parallel, these contacts are connected to the logic circuit. The common connection point of the capacitors, which automatically perform the various modes of operation in acts 62 and 63 and the output of the transistor. The selector arm 52 of stage QS is connected to the input of a transistor amplifier bank 513- / 1 with a bias voltage + V2 via 40 stage Q4 , which in turn connects a line to a tape cut pick-up switch 510. transistor amplifier stage Q 3 controls. When the tape cut pick-up switch is operated, stage β 3 is connected to a delay pick-up relay so the bias -l · V2 is connected through the selector arm # 23, which in turn is applied to the bias-52 on the selectable contacts, around the voltage + V2 .

processes to be described in the following are to be carried out. 45 A normally open contact K23-A des. Delay recording lais K23 lies between the

The logic circuit for the implementation of the contact K6-D and a pre-excitation input of the various correction modes contains an in-video recording part 46; the selector arm 53 of the switching pulse relay K24, which with one side to the Kon- bank £ 13-0 is also at the pre-excitation input clocks 2, 3 and 4 of the switching bank 513-1 and with the 50 of the video recording part 46. The switching positions 1, 2 others Side is connected to earth. If the and 3 of the switching bank 513-Λ are not connected, if the switch 513- / i is in one of the positions 2, 3, 4, then the switching position 4 is connected to a servo control relay, the pulse relay is connected depending on the beta KH, which in turn is due to the earth,
operation of the tape cut recording switch 510 bc- A in series with a normally open contact. The pulse relay is designed in such a way that its 55 clock K23-C , normally open contacts, contacts K24-A and K24-B , depending on Kd-C of the receiving relay K 6, couples the pre-tensioning of its first actuation and declines - \ V2 to a bank .Vl 1- / 1 of a tone-dependent operation are opened by the next actuation. art-Aiiswahlschallers 511. This switch bank is its - In other words, the relay contacts are connected in Ab- scits to a pre-excitation input of the tone dependence of successive actuations 60 of acquisition elements 47.

by operating the band-neck scarf When looking at the way in which the

ters510 alternately closed and open; The logic circuit with your Kopflminniel-Sorvosystein impulse relay contact K 24- / 1 connects the selector arm 47 and the Kapslan servo system 51 is connected, 55 of the switch bank 51 3-D with the bias voltage should first be established that the Diehznhlmesser-Ab-I V2. The contact 2 of the bank.V13 - /> is connected with a measuring head 39 to a Ιϋημηημ of each of these servo-Ilaltcrelais # 20, which in turn is coupled to the upstream systems. The servo control system KH voltage V2 is connected. Through contact 3 of the is used to feed the bank 513- /) with a /.citvcr/.ögcrungskreis 57 equal signals in /. Meanwhile the Scrvosyslcnio

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to regulate. In this regard, a normal diode 74 couples connected. The switch positions 1, 2, 3, closed contact K8-A, the second inputs and 4 correspond to the operating modes "video" alone, output of the head drum servo system 48 to a "video - (- Toni", "video + sound 2" and "Video line sync source 64. A normally open + tone 1 and 2." These operating modes correspond to contact K8-B couples the second input to a 5 different tone functions, which in the tone-up-vertical sync source 66, of which the vertical sync part 47 can be selected by appropriate The second input of the Kapstan- 511- / 1 is controlled. If the selector arm 78 is in the servo system 51, it is switched via a normally switched position 1 and the recording of a smart contact KS- C to the control track head 44 io new signal, the sound lamps 69 and 71 and do not glow via a normally open contact K8-D , while the video lamp 68 gl immt. This is coupled to the capstan servo system output. it is indicated that only the video part of the Si-A normally open contact K8-E couples the signal is recorded. In the switch position 2 control track head 44 on the tachometer acceptance glows, both the lamp 71 of the audio channel 1 as head 39. 15 as well as the video lamp 68, which indicates

So that an operator can operate the cable that the video signal and the audio signal in channel 1

can visually monitor the rectification system, which contains are recorded. In the switch position 3 glows

logic circuit a series of indicator lights. both the lamp 69 of the sound channel 2, as well as the

In this regard, there are tape cut, video on, video lights 61 to indicate that the video signal

and channel 1 and channel 2 sound recording 20 and the sound signal of channel 2 are recorded

lamps 67, 68, 69 and 71 are provided. Contains the. In switch position 4, both the lamps

System only has a single sound channel, so the sound channels 1 and 2 as well as the video lamp are pen

also only one sound recording lamp provided. All 68; this indicates that the video signal and

Lamps are neon or similar lamps with the sound signals of both sound channels added

a .Shrwellwertpotential, which are exceeded 25.

must be in order to cause a breakdown and the opening of the switch 513 of the glowing of the lamps above. The corrected circuit arrangement in the switching control lamp 67 is fed by a circuit which is 1 (normal operation), so the correction circuit contains a switching bank 513-E. Switching position 1 does not have any bias voltage, since switching position 1 of all of this bank is not connected, while the switch positions 30 switching banks of the switch are not connected. The lungs 2 to 4 together to the playback contact switch 5-6 can therefore be selectively switched to recording and the switch 5-6. The selector arm 56, playback and other (not shown) switches of bank 513-E is connected via a resistor 72 to the positions to connect the various anodes of the tape cut lamp 67, whose respective normal functions, other than the tape cathode, are connected to ground. A capacity 73 is to be carried out over 35 cutting processes in the tape recording and playback, a contact K24-B of the pulse relay K24 and device 17.

a normally open connection in series. To carry out the »short-term operation« contact K2Q-E of the holding relay20 parallel to the lamp, the switch513 is switched to switch position 2 and the. A normally closed contact switch 5-6 is switched to the playback position. K2Q-A of the holding relay forms a shunt to the 40. If the brief operation is to be started, the resistor 72 is. So if the switch bank 513-E in switch 510 is momentarily closed. The pulse of the tape cut switch positions 2, 3, 4, so relay K24 is thus momentarily excited. The lamp 67 lights up. At the point in time at which the prelims K24-A and K24-B are closed, a new piece of information is activated in a correction by the holding relay K20 . Therefore opens cycle begins, and during this recording 45 the contact K 20- / 1 flashes, and the contact K20-E closes, the correction flange 67 by opening the contact causing the correction lamp 67 to glow gc- K20-A and by closing the contact K20-E. is brought. Contact K20-C is closed. During this time, the capacitance 73 is periodically charged via the exciter circuit of the video lamp 68 for the Beden resistor 72 and discharged via the lamp driven by the subsequent closing of the contact. 50 K23-1) of the delay admission lais

The anode of the video acoustic lamp 68 is over ten. The contact K20-D closes to excite the receptacle of a diode 74 and normally open contacts relay K 6, whereby the contacts K 6-C K23-D and K20-D in series to re-establish contact and Κ6-Π are closed. Switched over the closed switch 5-6, while the cathode NEN contact K 6- /), the negative bias of this lamp is on Hrde. So when the delay 55 V2 on the transistor amplifier stage Q 5 of the Verrungsaufnahmerelais K 23 is excited and the new delay circuit 61 is given, whereby the capacity video information is recorded, the 62 glows over the amplifier stage to a spa level video recording lamp. is charged, which levels Q4 and Qi

The cathodes of the tomography tubes 69 and 71 are transmitted through; thus the delay notice

are connected to earth, dialing their anodes with 60 acceptance relays Λ, '23 energized. After the charging delay;> e-

In switching positions 2 or 3 of the sound bank 511- / J rungs /. Part of the capacitance 62 are therefore the contacts

of the sound mode selector switch connected to the delay input λ'23 is operated. the

are. The Sehaltstelliing 1 der.Schaltbank is imbe- Contact K 23- /) is closed to the "Video-

switches while the exhibition 4 au ilen y.iisani recording clamp 68 and one of the sound lamps 69 and

to bring positive terminals of a pair of 65 71 / um (ilimmcn, the enlsprc-

Diodeu 76 and 77, the negative terminals of which are connected to the chemical Tonlnmpe by the switch .Vl I.

the exhibition 2 or 3 of the Scliallbank aiigcsehal- selected special Toubelriebsail is determined.

let are. The selector arm 78 of the Sehallbank is niit the contact KIi-A- is closed to a He-

13 14

Tricbsvorspann to the Vidcoaufnahmeteil 46 to voltage is given via the transistor stages Ql and QI , whereby the new video signal is given to the video on the Haltcrelais K 20 and simultaneously charges heads 33 and 34 and given over the existing, the capacitance 59 on. The excitation of the holding relay recorded diagonal tracks on the tape causes the circuit to operate as assumed. The Koniakt K23-C is enclosed in the brief description of the short-term deployment described above in order to have an operating bias on the switchboard. In "long-term use" mode, the recording SH-A begins, which in turn feeds the sound recording of the new video signal but at the same time with part 47 with a bias voltage; This means that the signal is deleted at a point which, in relation to the direction of movement of the head, lies on the tape on the audio drum in the corresponding audio signal for recording. This results in an initial splice of the head stack 43. The Servorcgclrelais KS is reached as shown in Fi g. 3 is shown. A point X during the above-described switching functions of the magnetic tape 25 which does not excite existing spiral. Therefore, the tracks 79 recorded on the head drum are included, the point is the servo system 49 given signal for comparison and the tape which is adjacent to one of the video high frequency for deriving an error signal for the control 15 heads 33 or 34 at the moment the Head drum motor 36 from the tachometer-Ab- in which the video recording part 46 by closing recording head 39 and the Zcilcnsynchronquellc 64 ab- of the contact K23-A of the delay recording guide. The counter relay is excited on the capstan servo system 51. A point Y of the tape which, as signals for generating an error voltage with respect to the direction of tape movement, lies before that for driving the capstan motor 32 from point X , is the point which the Videor tachometer pick-up head 39 and the control erase head 41 is adjacent at the moment when track head 44 is derived. The tape take-up and re-erase oscillator 48 by closing the contact of the output device is therefore located in the playback- K24-A of the pulse relay is energized. In the figure, the video material originally recorded on the tape is synchronized with the video material originally recorded on the tape. Exact information through O, the new and the new signal to be used about the original match between the high frequency carriers of the formation recorded and a small amount of existing recorded signal on the band of radio frequency carrier interference is thus recorded information by X and the ones on the right. A high degree of erasure is also achieved by the erase head 41 of the completely erased of the existing signal, even though any new video information recorded on 30 tape remains by high-frequency carriers which are represented in permissible points. It is found that a dia measure generates interference. agpnale, electronic initial splice line 81

At the end of the "short-term deployment", the one which is temporarily closed by point X ver-SchaltcrSlO is called to run the impulse. The band part, which with respect to the band relay A'24 to be briefly energized, causing the contacts 35 to move behind. the splice line K 24-A and K24-B are opened. By opening it contains traces of the original video signal, the contact K24-B becomes the capacitance 73 of the transition area XY. which decouples with respect to the correction planar 67, so that it no longer flashes in the direction of tape movement in front of the splice line, but instead glows steadily. By opening the Hegt, contains traces of the new video signal together-contact K24-A , the excitation of the holding relay 40 men with a small amount of high-frequency / C20 is interrupted, causing all of its contacts in interference, which up to point Y progressively to their normal position return and the correct zero decreases. Complete a relatively small number of full cycle. permanent traces in the initial area of the transitional

It should be mentioned that the »KurzcinsatZÄ-Betrieb zone contains a small amount of interference, ξI is used when the mission is to be carried out over a relatively short distance while in the end area of the transition zone the inter-short distance, that is, when segments containing distance follow one another Distance is smaller than the tape movement tracks become progressively shorter and decrease in point Y on the distance between the video erase head and the video zero. The tracks, soft in relation to the high frequency heads. This operating mode is necessary because the tape movement direction is before point Y , because in the long-term use of the video erase head 50 are complete tracks of the new signal, which would erase part of the tape that would contain the Vidco high-frequency heads recorded on the completely erased tape only reached when they are. During playback the transition zone usage period has ended. To carry out the appears in the "I-angcinsatz" mode of operation "which follows immediately, the switch S 13 is set in the line following repeated image of the new" Schaltstcllung3 and the switch 510 55 video signal is initially pressed a small amount of high momentum the use of new frequency interference, which then rapidly progressively diminishes as vertical fade-out video material in the existing recorded video.
Material to begin on the tape. The impulse To end the "long-term use", the Korrclais K24 is excited and the contacts K24-A and rekturaufnahmeschalterSlO are pressed momentarily, to K24-B are closed. The positive bias 60 to excite the pulse relay K 24 again, whereby voltage f- V2 is opened via the switch 3 of the switch whose contacts. This causes the excitation of bank S1 3-D to delay circuit 57 and, via video extinguishing oscillator 48, to switch position 3 of switching bank S 13-C to the and the deletion of video extinguishing oscillator 48 on the band. The erasure stream of the video signal ends. At the same time, it therefore hears the video erasing head 41, so that the erasing 65 correction lamp 67 stops flashing and glows steadily, the existing video tape signal is immediately maintained, however, by the transistor stages Q 1 and indulge. Q2 given to the holding relay K 20 charge of the

The given to the delay circuit 57 pre-capacitance 59 energized this relay until the

15 16

Capacitance is picked up through the variable resistor 58 to the sound pickup part 47, which is discharged to a sufficiently small value, thereby disabling correspondence with the switching of the video to the transistor stages. This delay part due to the logic switching on and off time is switched on by adjusting the variable counter. In FIG. 3, the soundtracks belonging to the original state are set to the time which the tape on the video signal borrowed is required to pass between the video erase head and the drawn strip, while the to the new output point of the head drum; After this time, the correction cycle is ended after the soundtracks belonging to the signal used. The dashed stripes are shown,
When the end splice has been achieved, the tape cut mode selection switch is also shown in FIG. 3. The point M corresponds to the IO 513 in its "collective" switching position (switching point of the tape, which at the moment of subsection 4) Korrckturaufnahmesem is adjacent, while the point N corresponds to the point switch 510 automatically at the end of an existing tape, which at that moment collected the recording on the tape. As with the scanning high-frequency video head, the pulse relay K24 is activated. The area of the belt between transverse lines is momentarily excited, whereby its contacts K 24-A through points M and N is therefore closed in the time and K24-B .. The collective relay point is completely deleted when the excitation of K21 is over Switch bank 513-D and the Vidco video erase head is interrupted. Because of the pre-erase oscillator 48 energized at the same time over the switch mentioned delay, which corresponds to the time, 20 bank513-C. The erase current sent to the video erase head 41 by the tape to cover the distance NM therefore begins, each time required, but the high-frequency video heads pick up the video signal recorded on the tape in a continuous manner until the point M increases delete which is adjacent to the unpolluted part of the scanning head. At this point the tape immediately precedes
the video recording part 46 is no longer excited and 25 The excitation of the collective circuit leads to the conclusion that the recording of the new video signal is ended. The ßcn of his contacts. The Haltcrclais K 20 is recording the new video material is therefore excited up to the contact Κ2Χ-Λ. The contacts of this continued to the point on the tape in which the relay was terminated causing an erase in the manner described above; therefore, no blank flashes of the correction lamp 67 and excitation are generated on the tape. An electronic 30 of the recording circuit K 6. The recording circuit causes end splice line 82 runs diagonally through which, in the manner described above, the excitation of point M; on the part of the tape caused by the delay circuit 61 with respect to the tape movement delay recording circuit K 23 after a short distance in front of this splice line there are complete traces of the original delay: the delay is in the case of the initially recorded signal. In the band part, the collective mode of operation is greater than in the case of the operational modes with respect to the direction of movement of the band, since the contact K2i-B, the capacitance is immediately behind the splice line, bcfin- 63 connects the capacitance 62 in parallel. The excitation is a transition area, which is the inverse of the delay recording relay causes an excitation counterpart of the transition area of the beginning of the video and sound recording parts 46 and 47, splicing. In this regard, tracks 40 contain, as a result of which the recording of new video and audio switches is not started by a cross-line through the point Λ / signals on the tape in a way that is in their entirety the new - which is analogous to the ob ^ n described initial acceptance signal on the completely deleted lock of the "long use" mode is. In the band. Tracks, which are cut through this Oucrlinic-Sammck-Bctricbsart, however, are divided into two segments, 45 Servorcgelrclais KS over the switching position 4 of which one the ncuaufgcnommcnc signal to full - - switching bank 51 3-ß energized. This causes the contact to come containing the erased tape, while its KS-A is opened and the contact KS-B is closed, while the other contains the newly recorded signal with a vertical sync signal from the new low level of high-frequency carrier interference video signal as a reference to the head drum servo. The lengths of the interference containing 50 system 49 is given. The error output signal Spurscgmcnie increases progressively as the capstan scrvosyslcmsSl is reached via the contacts of point A / against the direction of tape travel. Λ'21-C and K23-B clamped to earth potential in order to generate the capstan drive motor 32 during the reproduction of the obcrgangsbcrichs of a nominal speed wedge Fchlersignallxv.ug for end splices. The picture shows a vertical fade-out of the interference in 55 contact KS-C opens, and contact K8-D closes, a direction which generates the output signal of the Kapslan servosyslcms as an indication during playback of the initial reference to it Input. To give, whereby a split is opposite. The interference ends abruptly at the compression comparison with that of the Drchzahlmesscr acceptance clinic 82, since the speed signal derived from the repeater 39 is derived. would give the original signal. starts again. It 60 At the same time the contact KS-E closes, whereby it can be established that before, during and after the Rcgelspurkopf 44 from the tachometer acceptance "Langcinsatz" the recording and playback device head 39 records the density pulses derived. The Sammek lock-up resulting from the correction system in the playback mode is shown in FIG. The capstan servo system 51 regulates the shown, in which the extended, recorded tape position in accordance with the original video recording track recorded on the tape in accordance with the original signal pulse of the control track 83, while the dashed Imsignal associated control track 83. pulse the Play back new control track, which together-In addition, the sound tracks 84 and 86 are played with the new signal by the control track head

is recorded. This new regular track begins at the transition between the existing recorded material and the "collected" new material. The point Z, at which the recording of the new control track begins, is adjacent to the control track head at the moment in which the servo control relay ΑΓ8 is energized. With respect to the direction of tape movement, this point lies behind point X, since the control track head is offset in the direction of tape movement relative to the spiral scanning arrangement 22 of the recording and reproducing device 17. It should be noted that there is no discontinuity between the original and newly recorded control track and therefore no loss of synchronicity occurs in the transition.

The termination of the collective mode is initiated by momentarily closing the correction recording switch 510, which causes the contacts K 24-A and K24-B of the pulse relay to open and the »Sammek correction mode is terminated.

In order to generate a completely corrected main volume a number of recorded To splice segments, a control track is preferably first pre-recorded on the main tape. Then the »LangcinsatZÄ mode of operation is used to move the segments in continuous Way with a small overlap between successive segments at the corrected Record transitions on the main tape. The phase continuity at the transitions is maintained, since the Kapstan and head drum servo systems of the recording and reproducing device 17 in Playback operation can be held and thus regulated by the pre-recorded control track. Based A preferred embodiment of the invention has been described above. The invention however, it is not limited to this embodiment. For example, the relays in the logic circuit of the correction system is of a relatively illustrative nature. It is possible through them to be replaced by solid-state electronic switches or equivalent switching units. The term »relay« In this context, denotes a switching unit with one that closes or opens a circuit Switching mechanism that is actuated as a function of the excitation of an actuating element.

Claims (13)

Patent claims: 1. Electronic tape cutting system for a spiral-scanned Vidco tape recorder and player with rotating tape supply and take-up reels on a plate, a spiral scanning arrangement mounted on the plate, which is a guide for guiding the magnetic tape between the supply and take-up reels in a spiral around a , has at least one video high-frequency head, rotating head drum, a drive arrangement mounted on the disk with a capstan for moving the tape / wiping the supply and take-up reels, a capstan motor in drive connection with the capstan shaft, one with the Head drum in a drive vurbincliing standing head drum motor, a tachometer device driven by the head drum for generating speed pulses corresponding to the head drum position, a video erase head mounted on the plate transversely to the tape, which in relation to the tape movement direction in front of the spiral btastordnung is arranged, a recording part coupled to the video high-frequency head (s) for recording a video signal, a video erasing oscillator coupled to the video erasing head for feeding an erasing current into the video erasing head, a head drum servo system coupled to the head drum motor for controlling the head drum motor as a function of a head drum motor Error signal, which is derived by comparing signals at a first and second input of the head drum servo system, a capstan servo system coupled to the capstan motor for controlling the capstan motor as a function of a capstan error signal, which is determined by comparing signals to a first and second input of the capstan servo system is derived, and with a mounted on the disk control track head, which is arranged for receiving a control track on the tape or the playback of a control track from the tape adjacent to the tape, characterized in that a tape editing bsart selection switch (513) with selectable “normal”, “short use”, “long use” and “Sammek operating mode” switching divisions is provided that a tape cut take-up switch (510) is coupled to the tape cut mode selection switch (513) when actuated, trigger pulses on the edge cutting mode selection switch (513) are that a logic circuit for coupling the tape cutting mode selection switch (513) to the video recording part (46), the video delete oscillator (48), the head drum servo system (49), the capstan Servo system (51), the tachometer device (37, 38) and the control track head (44) is provided that the logic circuit connects the first input of the head drum servo system (49) and the first input of the capstan servo system (51) with the tachometer device (37, 38) connecting the recording head (39), a switching unit (K 8. K S-A) and a switching unit (K8, K8-C) which normally connects the second input of the capstan servo system (51) to the reverse track head (44), so that the tape cutting mode selection switch (513) is in the »normal operating mode switch position (I. ) the tape cut recording switch (510) decoupled from the logic circuit that the logic circuit when the tape cut operating mode selection switch (513) is set in the "short-term use" operating mode sound position (2) has a through-connected switching unit combination which - As a function of a first pulse of the trigger pulses - licn Vicleoaufnahmeteil (46) excited and - As a function of a momentary impulse of the trigger impulses - the excitation of the video recording device (46) that interrupts the logic circuit when setting the tape cut mode selector (513) in the »I.angcinsat /. position (3) another connected switching unit combination has, which - as a function of a first pulse of the trigger pulses - at the same time energizes the video recording part (46) and the video extinguishing oscillator (48) and - as a function of a second pulse of the trigger pulses - the excitation of the video extinguishing oscillator (48) and after a predetermined time delay the excitation of the video recording part (46) interrupts, and that the logic circuit bsi setting the tape cutting mode selection switch (513) in the »Sammek operating mode switch position (4) has a third switching unit combination connected through, which - As a function of a first pulse of the trigger pulses - at the same time the video recording part (46) and the video delete oscillator (48) energized, the second input of the head drum servo system (49) with a source (66) of a vertical sync derived from the video signal to be recorded Chronsignals connects the output of the capstan servo system (51) with a nominal speed reference potential connects, connects the second input of the capstan servo system (51) with its output and connects the control track head (44) from the second input of the capstan servo system (51) and connect it to the tachometer device (37, 38) connects and which - as a function of a second pulse of the trigger pulses - the excitation of the video recording part (46) and the video delete oscillator (48) interrupts and the second input of the head drum servo system (49) reconnects to the reference signal source (64), the output of the capstan servo system (51) from the nominal speed potential switches off, switches off the second input of the capstan servo system (51) from its output and the control track head (44) switches off the tachometer device (37, 38) and connects it again to the second input of the capstan servo system (51). 2. Tape cutting system according to claim 1, characterized in that the logic circuit has a first relay (K23) and an excitation element and associated, normally open switching contacts (K23- / 4, K23-B, KH-C, £ 23-D) for closing of electrical circuits when the excitation element is excited, that bias voltages (+ Fl, + V2, -V2) are provided as excitation supply voltage, that a first switching contact (£ 23- / 1) of the first relay (K 23) the bias voltage (- V 2 ) coupled to the video recording part (46) that the logic circuit has a second relay (K 6) with an excitation element and associated, normally open switch contacts (£ 6-C, K6-D) , that a first switch contact (K6-D) of the second relay (K 6) the bias voltage (- V2) on the excitation element of the first relay (£ 23) couples that the tape cut switch type selection device (S 13) several switch banks (5 13- / 1, 513-ß, S 13- C, 513-D, S 13-E) each with »normal«, »short deployment«, »long deployment« and »Sammek mode switching Stcllungen (1, 2, 3 or 4) and one / between the switching positions unischallbarcn selector arm (52, 53, 54, 55, 56) that the rolling lines of the switch banks are designed to run in the same direction, that the Uaiulschnittaiifnahmcscliallci · (ΛΊ0) clic bias (+ f 2) to the selector arm (52) of the first switch bank (513- / 1) that the logic circuit a third relay (£ 24) with an excitation element and associated, normally open, alternately closing with successive excitations of the excitation element and opening switch contacts (K 24- / 1, K24-B) that the exciter element of the third relay (K24) to the "short use" -, "long use" - and "collective" contact (2, 3, 4) of the first switch bank (513- / 1) is switched on together that a first switch contact (K24-A) of the third relay (K 24) the bias voltage (-1- V2) to the selector arm (55) of the second switch bank (513- /) ) couples that the logic circuit is a fourth relay (K 20) with an excitation element and a normal The switching contacts (K20-C, K20-D, K20-E) are closed (K 20- / 1) and normally open, so that the excitation element of the fourth relay (K 20) is connected to the »short-term use« contact (2nd ) the second switch bank (513-D) is switched on, that the first switch contact (K20-D) of the fourth relay (K 20) couples the bias voltage (+ Fl) to the excitation element of the second relay (K 6), that a delay circuit ( 57, Ql, Q2) couples the "long use" contact (3) of the second switch bank (513-D) to the exciter element of the fourth relay (K 20) so that the "long use" contact (3) of the second switch bank (513 -D) and the "long use" contact (3) of the third switch bank (513-C) are connected together, that the selector arm (54) of the third switch bank (513-C) is connected to the video delete oscillator (48), that the logical Circuit a fifth relay (K 21) with an excitation element and associated, normally open switch contacts (K21-A, K21-B, K21-C) that the excitation element of the fifth Relay (£ 21) is connected to the »Sammek contacts (4) of the second and third switch bank (513-D, 513-C) together, so that the first switch contact (£ 21- / 1) of the fifth relay (£ 21) the selector arm (55) of the second switch bank (513-D) is coupled to the exciter element of the fourth relay (£ 20) so that the second switch contact (£ 21-C) of the fifth relay (£ 21) and the second switch contact (£ 23- ß) of the first relay (£ 23) are in series and couple the output of the capstan servo system (51) to the nominal speed reference potential so that the logic circuit is a sixth relay (£ 8) with an excitation element and associated, normally open (£ 8-ß, £ SD, £ SE) and normally closed switch contacts (£ 8- / 1, £ 8-C) means that the error element (£ 8) is connected to the "collective" contact (4) of a fourth switch bank (513 -ß) is switched on, that the selector arm (53) of the fourth switch bank (513-ß) is connected in series to the first switch contact (£ 23- / 1) of the first relay (£ 23), that the first of the no Sometimes open switching contacts (£ 8- / i) of the sixth relay (£ 8) couples the second input of the head drum servo system (49) to the vertical synchronizing source (66) that the first of the normally closed switching contacts (£ 8- / 1) of the sixth relay (£ 8) couples the / wide input of the Kopttruinmel Scrvosystem (49) to the lkv.ugssignalquelle (64) that the second of the normally olTe- Inen switching contacts (K8-D) of the sixth relay (KS) the output of the capstan scrvo system (51) ^; to its second input that a second of the normally closed switching contacts (K8-C) of the sixth relay (K8) couples the Rcgclspurkopf (44) to the second input of the capstan scrvo system (51) and that a third, normally open contact ( K8-E) of the sixth relay (K 8) couples the control track head to the tachometer device (37, 38). 3. Tape cutting system according to claim 1 and 2, characterized in that a further delay circuit (61, Q 3, Q 4) couples the first switching contact (K6-D) of the second relay (K 6) to the Erregcrclcmcnt of the first relay (K23) . 4. Bandschnittsystcm according to claim 1, 2 or 3, characterized in that a tape cutting indicator lamp (67) is provided with a predetermined Entladungsschwcllwertpotential that a fifth switching bank (S13-E) with its "short use" -, "long use" - and "collecting" -Contact (2. 3, 4) is coupled together to the bias voltage (+ Fl) that a resistor (72) the Wiihlarm (56) of the fifth switch bank (S13-E) to the Bandschnittanzeigclampc (67) that the normally closed switching contact (KlO-A) of the fourth relay (K20) is parallel to the resistor (72) that a capacitance (73) via the transmission circuit of the second, normally open switching contact (K 20- £) of the fourth relay (K 20) and of the second switching contact (K24-B) of the third relay (K24) of the tape cut indicator lamp (67) is connected in parallel and that a video signal lamp (68) on the one hand via the Senensclialtuii: »a first diode (74). of the third, normally open switch contact <\ s (K20-C) · of the fourth relay (A'20) and of the third, normally open switch contact « (K23-D) of the first relay (K 23) to the bias voltage (-! Fl ) is coupled and on the other hand reads to earth. 5. Tape cutting system according to one of claims 1 to 4, characterized in that the "Langeinsat." - contact (3) of the second Sdiallbnnk (S \ 3-D) with the Errcgcrelcment of the fourth element (K20) coupling a delay circle Transistor amplifier (oil, Q2) and a parallel circuit connected to the input of the transistor amplifier and made up of a variable resistor (58) and a capacitance (59) and that the variable resistor (58) is set in such a way. that it forms a time constant with the capacitance at which the transistor amplifier remains switched on for a time which the tape needs to move between the video erase head (41) and the head drum. 6. Bandschnitlsystem according to one of claims 1 to 5, characterized in that a sound recording part (47) is provided that a sound mode selection sounder (SIl) with two Schaltbänkcn (SU-A. SW-Ii) is provided that '. the switch banks of the audio mode selector switch »Vidco-allcin«, »Video I-audio channel 1«, »Video H- audio channel 2« and »Video + audio channels 1 and 2« switching contacts and associated selector arms that can be switched between the switching positions ( 78), that the selector arms of the switching banks of the audio mode selector switch are designed to run simultaneously, that the contacts of the first switching bank (SIl-A) of the audio mode selector switch via the series connection of the second switching contact (K 6-C) of the second relay (K 6 ) and the second switching contact (K 23-C) of the first relay (K 23) are coupled to the sound recording part (47) in order to give a pre-excitation in selective, predetermined control ratios to the sound recording part as a function of the supply of a bias voltage to the first switching bank that audio channel 1 and audio channel 2 indicator lamps (69, 71) are provided with a predetermined discharge threshold value potential, that the connection point of the first diode (74) and the video recording clamp PE (68) is connected to the selector arm (78) of the second switching bank (SIl-B) of the audio drive mode selector switch so that the audio channel 1 indicator lamp (71) between the "video + audio channel!" contact of the second switching bank (511 -B) of the audio mode selection switch and earth is switched, that the audio channel 2 display Iainpe (69) is switched between the "video + channel 2" contact of the second switch bank (S 11 -B) of the audio mode selection switch and earth, that a second diode (76) between the "video + audio channel 1 and 2" contact and the "video + audio channel 1" contact of the second switch bank (5 II-Z?) of the audio mode selection switch is connected and that one third diode (77) between the »video + audio channel 1 and. 2 "contact and the" video + audio channel 2 "contact is switched. 7. tape cutting system according to one of claims I to 6, characterized in that the first relay (K 23) is used as a delay receiving relay. 8. Bandschnittsystcm according to one of claims 1 to 7, characterized in that the second relay (K 6) is used as Aufnahmerclais. . 9. tape cutting system according to one of the claims 1 to 8, characterized in that the third relay (A'24) is used as a pulse relay. 10. tape cutting system according to one of the claims 1 to 9, characterized in that the fourth relay (K20) used as holding relay, finds. 11. Tape cutting system according to one of claims 1 to 10, characterized in that the fifth relay (K21) is used as a collecting relay. 12. Bandschnittsystcm according to one of claims 1 to 11, characterized in that the sixth relay (K 8) is used as a Servoregclrclais. . 13. Bandschnittsystcm according to one of claims 1 to 12, characterized in that the increasing speed reference potential earth potential is. 1 sheet of drawings