EP0205433A1 - Procede de commande d'un appareil a bande video pour la recherche automatique de segments de bande video enregistres et appareil a bande video pour realiser ce procede - Google Patents

Procede de commande d'un appareil a bande video pour la recherche automatique de segments de bande video enregistres et appareil a bande video pour realiser ce procede

Info

Publication number
EP0205433A1
EP0205433A1 EP19850900978 EP85900978A EP0205433A1 EP 0205433 A1 EP0205433 A1 EP 0205433A1 EP 19850900978 EP19850900978 EP 19850900978 EP 85900978 A EP85900978 A EP 85900978A EP 0205433 A1 EP0205433 A1 EP 0205433A1
Authority
EP
European Patent Office
Prior art keywords
ctl
tape
video tape
pulses
video
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19850900978
Other languages
German (de)
English (en)
Inventor
Christian Ebeling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0205433A1 publication Critical patent/EP0205433A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/005—Programmed access in sequence to indexed parts of tracks of operating tapes, by driving or guiding the tape
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
    • G11B15/087—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing recorded signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
    • G11B27/024—Electronic editing of analogue information signals, e.g. audio or video signals on tapes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/22—Means responsive to presence or absence of recorded information signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
    • G11B27/322—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier used signal is digitally coded
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
    • G11B27/322—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier used signal is digitally coded
    • G11B27/324—Duty cycle modulation of control pulses, e.g. VHS-CTL-coding systems, RAPID-time code, VASS- or VISS-cue signals

Definitions

  • the invention relates to a method for controlling a video tape device according to the preamble of patent claim 1 and a video tape device for performing the method, as is known from DE-OS 28 1 721.
  • a control device for magnetic recording and / or reproducing devices 0 in which pulse sequences which can be tapped are stored in the magnetic recording medium.
  • a counter which registers the pulse sequences readable from the magnetic medium, provides a count value assigned to a specific position on the magnetic medium. 5
  • a value corresponding to a specific position on the recording medium is read into a programmable memory.
  • a comparator compares the count value indicated by the counter against the value recorded in the memory.
  • a specific position Q on the magnetic recording medium is approached by a search device which selectively switches on a rapid drive of the magnetic tape device until there is a specific relationship between the two position values compared by the comparator and which then opens the magnetic tape device sets a different operating speed.
  • the magnetic recording device is a cassette video tape recording device.
  • the so-called CTL pulses are used, which actually deoband advocatess are used to synchronize 'the heads of Vi ⁇ .
  • the CTL pulses are counted during the tape pass and thus a specific value is assigned to each tape position. If a specific belt position is to be selected, the corresponding pulse count must be entered in a memory. If the current count of the counter reaches this value, the control device switches to normal belt travel. Since errors can occur during pulse counting, particularly during fast tape forward and reverse search, the desired tape position is not exactly achieved. In addition, the counter values caused by scanning errors and deviating from the real instantaneous position cannot be corrected during the entire search procedure.
  • the invention is based on the object of initially specifying a method which, in a simple and reliable manner, permits the exact finding of recorded video tape sections, in particular in the case of fast tape advance and rewind.
  • This object is achieved in that the information characterizing the beginning of the respective video tape section is imprinted on the tape as a change in the CTL pulses, which are evaluated by the CTL head and a processor which interacts with the CTL head to control the tape run (faster or slower, forward or reverse tape search).
  • this creates the possibility of setting quasi reference marks along the CTL pulse track of a video tape can be used in the search mode to correct the "current count for the compensation of counting errors.
  • the method advantageously makes use of signals that are present on every video tape anyway * and whose purpose can be seen in the synchronization of the video head.
  • the synchronous or CTL pulses are only in those areas of the tape in which video information is actually stored on the video tape and thus field synchronization of the video heads is necessary depending on the CTL pulses. Since the synchronization of the video heads is not necessary, a new task is assigned to the CTL track or the CTL head within this gap, namely to serve as a carrier or detector for the initial information of subsequent video tape areas.
  • Claims 2-6 describe advantageous types of changes in the CTL pulses which can be easily generated and decoded by simple electronic components. If, for example, the change in the CTL pulses is present as a pulse gap, this gap represents, as it were, digital switching information that can thus be evaluated without analog-digital conversion, e.g. can be used to advance an up-down counter or can be used as a stop pulse for fast tape travel.
  • CTL start pulses are used to supply a "reset pulse" to the first up / down counter at the beginning of the tape.
  • Claim 9 makes it possible to assign several changes in the CTL pulses to a specific counter reading of the first up-down counter and thereby to correct the counter reading at a plurality of tape positions, which further improves error suppression.
  • Claim 10 not only uses the number of changes in the CTL pulses to correct the first up-down counter, but also the number of CTL pulses within the video tape sections, i.e. between the changes in the CTL pulses. As a result, a second measure is taken to correct counting errors. With this double security system, video tape sections are correctly determined and found with a high degree of security.
  • Claim 11 teaches a particularly advantageous way of transferring the changes in the CTL pulses from a mother tape to the video tape to be coded during a copying process.
  • CTL pulses pulse conduit in a simple manner either by interruption of the 'signal processing unit with the CTL-head connecting I (producing a pulse gap) or by connecting a frequency * or modulation generator to the pulse line (generating a frequency or modulation change) of the CTL pulses.
  • the (preferably electronic) switches can easily be opened and closed by a corresponding audio signal, so that the components required for carrying out the method can be easily retrofitted to conventional video recorders of all systems, provided that care is taken that in the latter the CTL head remains on the belt during fast forward and rewind.
  • Claims 13-18 describe the device design which is advantageous for carrying out the above-mentioned method.
  • the device in conjunction with the method according to the invention, can solve both the counting problems that arise from the fact that, in most commercially available video recorders, the tape often lifts something off the heads when the tape stops (so that a simple incremental or decremental counting often fails due to the swallowing of CTL pulses per se on the tape), as well as the counting errors resulting from tape slip or tape stretching are compensated and corrected.
  • FIG. 5 shows a fourth type of change in the CTL pulses
  • FIG. 6 shows a fifth type of change in the CTL pulses
  • FIG. 7 shows a visual representation of the essential components of a video tape device for carrying out the method.
  • the video tape designated 1 in FIG. 1 has a video track 2, a sound track 3 and a CTL pulse track 4. The latter are impressed when the tape CTL-Tmpulse 5 is recorded on.
  • a first tape section 7 is described with initial CTL pulses 8, which are followed in the tape scanning direction 9 in a second tape section 10 by a first pulse change 11 in the form of a pulse gap 12, which is used for the initial identification of a first video tape section 13 , whose signals are recorded in a third band section 14.
  • Another pulse gap 15 follows in a fourth tape section 16 and serves to identify a second video tape section 17 in a fifth tape section 18.
  • a band section is shown at 20, on which five different types of changes in the CTL pulses 5 are indicated in a schematic representation one above the other in the drawing.
  • 21 shows a pulse change in the form of a CTL frequency change
  • 22 a change in the CTL pulses in the form of an amplitude reduction or change
  • 23 a modulation change in the CTL pulse envelope
  • 25 a CTL pulse ⁇ gap (see pulse gaps 12 and 15)
  • 26 a frequency modulation change of the CTL pulses.
  • a demodulator is shown at 40, at whose input 41 there are, for example, the output signals of a further video recorder on which a mother tape is played for copying purposes.
  • the demodulator 40 is followed by a signal processing unit 42, in which the audio and video signals are separated and, depending on the video signal, the CTL pulses required to control the video heads are generated.
  • the signal processing unit 42 is connected via an audio head line 43 to a sound head 44, via a video head line 45 to the video heads 46 and a CTL pulse line 47 to a CTL head 48.
  • a first switch 49 is provided (for generating pulse gaps), which is switched into the CTL pulse line and can interrupt it if necessary to generate gaps ( or to "zero potential").
  • This switch is opened and closed as a function of a sound signal detection unit 50, which responds when a sound signal, for example a very specific frequency, is output from the mother tape. For this reason, the audio signal detection unit 50 is also connected to the audio header 43.
  • a modulation or frequency generator 51 is provided for this purpose, which is connected to the CTL pulse line via a second switch 52. device can be activated.
  • the second switch is also opened and closed depending on the sound signal detection unit 50.
  • the arrangement of the switches shown is a simplified arrangement, it is conceivable, for example, that the switch 49 must be opened and the switch 52 closed in order to connect the modulation or frequency generator, or - if the "normal" CTL pulses are superimposed with such a frequency generator 51 for generating a pulse change that both switches 49 and 52 must be closed.
  • the switches 49 and 52 will also not be mechanical but electronic switches.
  • the audio head 44, the video heads 46 and the CTL head 48 are again shown under the designations 44 ', 46' and 48 'for the following description of the processes when playing a coded tape and with the essentials for evaluation the elements provided for the changes in the CTL pulses.
  • the output 53 of the CTL head 48' is connected to a device for controlling the video heads 46 ', which is referred to as head servo 54 for short.
  • the output 53 of the CTL head is provided with a CTL recognition device 55. And with the counting inputs 56 and 57 of a first and third forward.
  • Down counter 58.59 connected. Occur CTL pulses at the output 53 of the CTL head 48, the first and third up-down counters will count up or down, depending on a strip travel direction discriminator (not shown) for detecting the strip travel direction.
  • a first output 60 of the CTL detection device 55 emits a signal whenever a change in the CTL pulses occurs at the output 53 of the CTL head 48 '.
  • the change of state of the output 60 is used via a line 61, to count a 'second forward greed ⁇ Wind lake counter 62 up or down (abhot ⁇ gig from mixessdiskriminato), to which the line 61 to a count input 63 of the second forward Back counter 62 is connected.
  • ⁇ is placed the CTL pulses over a zeroing input 64 of the third forward-Rück ⁇ Wind lake counter to zero upon the occurrence of a change, so that this only the Tenden occurring between the changes of the CTL pulses CTL pulses, so the belongs to the videotape sections.
  • the output 53 of the CTL head 48 ' is also connected to an initial pulse detection device 65, the output 66 of which is connected to further zeroing inputs 67, 68 of the first and second up-down counters 58 and 62 is connected so that the latter are set to zero at the beginning of the tape.
  • the outputs 69, 70 are assigned to the second and third up-down counters Storage 71,72 downstream, in which either a transfer device 73, one or more setpoints will stored can "n or Sollwertab touched 'is automatically stored via a pulse line 74, for example, at a first lang ⁇ seed passage of the coded tape depends on the number of the CTL pulses at the output 53 of the CTL head 48th
  • the second up / down counter 62 will activate the memory 71 when the first CTL pulse occurs, and store the associated setpoint (for example 150) via the set input 75 in the first up / down counter when the second pulse change occurs (Counter reading 2 in the second up-down counter) store the associated setpoint (for example 1520) in the first counter, etc.
  • the third up-down counter 59 and the downstream memory 72 act accordingly, whereby however, not due to the changes in the CTL pulses but depending on the number of CTL pulses / video tape cuts a setpoint assigned to this is taken over the set input 75 in the first up-down counter.
  • the changes in the CTL pulses and the length of the video tape sections thus serve in the same way as "reference marks" for correcting the counter reading of the first up-down counter, the counter reading of which is used to locate a video tape section.
  • a search value can be entered via the input device 73 which corresponds to the beginning of a video tape section.
  • This search value is compared in a comparator 76 with the present counter reading of the first up-down counter, and if differences in the values to be compared occur, a tape drive control for driving the video tape forwards or backwards is influenced.
  • the audio head 44 'and the video head 46' are followed by a signal processing device 42 ', in which the audio and video signals are processed in such a way that they can be made visible on a monitor 78.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

Procédé de commande d'un appareil à bande vidéo pour la recherche automatique de segments de bande vidéo enrégistrés (13, 17), en particulier en cas de déroulement rapide de la bande, où une valeur de recherche introduisible et caractérisant le début du segment de bande vidéo (13, 17) est comparée avec la position d'un compteur (58) qui compte positivement ou négativement en fonction de la direction de déroulement de la bande. Afin d'améliorer la précision de la recherche des débuts des segments de bande vidéo (13, 17), on utilise les impulsions CTL servant à la synchronisation des têtes vidéo pour commander le compteur (58). Au début des segments de bande vidéo est inscrite sur la bande une modification des impulsions CTL, par exemple sous la forme d'un vide d'impulsions CTL (25), qui est lue et évaluée par la tête CTL (48) et qui sert à commander le déroulement de recherche de la bande.
EP19850900978 1984-02-18 1985-02-16 Procede de commande d'un appareil a bande video pour la recherche automatique de segments de bande video enregistres et appareil a bande video pour realiser ce procede Withdrawn EP0205433A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3405910 1984-02-18
DE19843405910 DE3405910C1 (de) 1984-02-18 1984-02-18 Verfahren zur Steuerung eines Videobandgeraetes zum automatischen Auffinden von bespielten Videobandabschnitten sowie Videobandgeraet zur Durchfuehrung des Verfahrens

Publications (1)

Publication Number Publication Date
EP0205433A1 true EP0205433A1 (fr) 1986-12-30

Family

ID=6228153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850900978 Withdrawn EP0205433A1 (fr) 1984-02-18 1985-02-16 Procede de commande d'un appareil a bande video pour la recherche automatique de segments de bande video enregistres et appareil a bande video pour realiser ce procede

Country Status (3)

Country Link
EP (1) EP0205433A1 (fr)
DE (1) DE3405910C1 (fr)
WO (1) WO1985003797A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2252443A (en) * 1991-01-09 1992-08-05 Samsung Electronics Co Ltd Counting tape running time

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ATA399884A (de) * 1984-12-17 1985-11-15 Alfred Ing Benesch Zusatzeinrichtung fuer videorekorder zur ermoeglichung einer nahezu sekundengenauen band-ziel-positionierung zur auswahl bestimmter ron-bildaufzeichnungen
DE3619359A1 (de) * 1986-06-09 1987-12-10 Gen Service Electronics Gmbh Verfahren zum uebertragen eines informationskodes auf der synchronspur eines videobandes, vorrichtung zur durchfuehrung des verfahrens sowie nach dem verfahren hergestelltes videoband
EP0476725A3 (en) * 1987-01-29 1993-12-01 Sony Magnescale Inc Production of pre-recorded tape and tape cassettes
EP0277778B1 (fr) * 1987-01-29 1993-12-29 Sony Magnescale, Inc. Production de cassettes à bandes préenregistrées
FR2616258A1 (fr) * 1987-06-05 1988-12-09 In Formation Sarl Procede, dispositif et bande de magnetoscope pour etablir un dialogue programme interactif entre un magnetoscope et un ordinateur
DE3742469C1 (de) * 1987-12-15 1989-05-24 Graetz Nokia Gmbh Videorecorder mit einer Einrichtung zur Aufzeichnung einer zusaetzlichen Steuersignalspur auf ein Videoband
EP0412156B1 (fr) * 1988-04-14 1993-09-01 Kyodo Printing Co., Ltd. Procede de determination de la validite d'un support d'enregistrement magnetique
NL8802449A (nl) * 1988-10-06 1990-05-01 Philips Nv Systeem voor willekeurige toegankelijkheid tot informatie op een magneetband.
DE4217508A1 (de) * 1992-05-27 1993-12-09 Michael Beyreuther Vorrichtung zum bildgenauen, manuellen elektronischen Schneiden von Videoaufnahmen
DE19528955A1 (de) * 1995-08-07 1997-02-13 Thomson Brandt Gmbh Korrektur der Bandzähleinrichtung eines Recorders
DE10051557A1 (de) * 2000-10-18 2002-04-25 Thomson Brandt Gmbh Spurmarkierung für einen D-VHS Recorder

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US4012784A (en) * 1975-11-28 1977-03-15 Minnesota Mining & Manufacturing Company Voice logging recorder including decks dedicated for both logging and recall operations
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2252443A (en) * 1991-01-09 1992-08-05 Samsung Electronics Co Ltd Counting tape running time
GB2252443B (en) * 1991-01-09 1994-11-16 Samsung Electronics Co Ltd Counting tape running time

Also Published As

Publication number Publication date
DE3405910C1 (de) 1985-12-12
WO1985003797A1 (fr) 1985-08-29

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