EP0823113A1 - Appareil d'enregistrement et de lecture de pistes en spirale de donnees - Google Patents

Appareil d'enregistrement et de lecture de pistes en spirale de donnees

Info

Publication number
EP0823113A1
EP0823113A1 EP96914947A EP96914947A EP0823113A1 EP 0823113 A1 EP0823113 A1 EP 0823113A1 EP 96914947 A EP96914947 A EP 96914947A EP 96914947 A EP96914947 A EP 96914947A EP 0823113 A1 EP0823113 A1 EP 0823113A1
Authority
EP
European Patent Office
Prior art keywords
recording device
atf
lane keeping
head
servo
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.)
Ceased
Application number
EP96914947A
Other languages
German (de)
English (en)
Inventor
Jürgen Kaaden
Dietmar Bräuer
Gerhard Reiner
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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
Priority claimed from DE1995115074 external-priority patent/DE19515074A1/de
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0823113A1 publication Critical patent/EP0823113A1/fr
Ceased 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
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/20—Signal processing not specific to the method of recording or reproducing; Circuits therefor for correction of skew for multitrack recording
    • 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
    • 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
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/463—Controlling, regulating, or indicating speed by using pilot tracking tones embedded in binary coded signals, e.g. using DSV/CDS values of coded 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
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
    • G11B15/4673—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating
    • G11B15/4675—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking
    • G11B15/4676—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction
    • G11B15/4677—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction using auxiliary signals, i.e. pilot signals
    • G11B15/4678—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction using auxiliary signals, i.e. pilot signals superimposed on the main signal track

Definitions

  • the invention relates to a helical track recording and playback device for data according to the preamble of claim 1.
  • the disadvantage in case (a) is the necessary restriction of the data channel bandwidth and the exact compliance with the pilot carrier amplitudes to avoid interference from harmonics.
  • the disadvantage in case (b) is the low amplitude, since use is made of a method of digital sum variation in the clock of the pilot carrier frequency, which allows only low pilot carrier energy.
  • the pilot tones can be interleaved in time division multiplexing (burst ATF). Since no data is transmitted at the same time, the energy of the pilot frequencies is very high. The duration of the pilot tone keying, which is reduced to the necessary settling time of the evaluation filter, is disadvantageous.
  • the processing of the ATF information (including burst ATF) for the DVC (Digital Video Cassette) format is integrated into a microcontroller system, so that all the correction signals are processed by it and the corresponding motor control signals are provided depending on the operating modes.
  • the area of the embedded ATF is used for tracking in normal playback mode, while the burst ATF area is used for overwriting mode and search playback of recorded data to find predetermined track components, e.g. MPEG data.
  • the ATF signal is obtained in a filter module, which also rectifies the filtered pilot tones.
  • the two DC voltage values are queried and processed in the servo microcontroller with A / D converters. Coupled to the rotation of the head drum, pulses are generated by the servo system, which switch the ATF preparation between direct mode and hold mode, so that an evaluation is achieved by the microcontroller during the fast ATF burst phase.
  • the digital magnetic tape recorder for lane keeping signals is equipped with a partially short duration, with a head drum, a tape drive mechanism, a head amplifier, a servo control system and a lane keeping signal processing with filter stages and rectifiers.
  • the lane keeping signal processing is maintained at the previous value for the duration of a hold pulse output by the servo control system, depending on the operating mode.
  • the stop pulse is from the head drum revolution derived.
  • the hold state is used to suppress faults and to evaluate signals of a short period of time, based on the total evaluation time.
  • the position and length of the hold pulse depends on the operating state and is determined from the head drum position and changed by the servo and microcontroller.
  • the crosstalk components are evaluated in normal operation and in overwrite operation as a criterion for tracking.
  • the position of the lane keeping signals with a partially short duration is evaluated in search run reproductions relative to the head drum rotation for lane keeping. Instead of the crosstalk components, the pilot signal read directly from the track is evaluated.
  • Fig. 8 oscillograph image of the filter outputs.
  • the DVC system is based on inclined track recording.
  • 5a shows the necessary head drum T, the read / write heads 1/2 are also shown. In the case shown, you dip one after the other into band B.
  • the schematic of the tracking frequencies and the resulting tracks is shown in simplified form in FIG. 5b.
  • the heads 1/2 have different azimuth angles, the crosstalk signal suppression being low at low frequencies.
  • the low-frequency tracking frequencies F1, F2 change from turn to turn when recording for a head changed, an FO signal is generated for the other head, which suppresses portions of Fl and F2 contained in the video, audio and data signal to be recorded in general.
  • the FO tracks are therefore free of pilot carriers.
  • the head 2 is used for the evaluation during the reproduction. The following applies:
  • the head 2 (and because of the fixed geometric coupling on the head drum also head 1) optimally follows the track if the crosstalk components Fl / F2 from the neighboring tracks have the same amplitude.
  • the lane keeping signals used for tracking and recorded on the tape can be seen in FIG. 2 in the lower image area.
  • a magnetized piece of tape of a DVC recording coated with bitter liquid reflects the light in accordance with the tape magnetization.
  • the beginning of the track is shown, in which the low-frequency ATF structures F0, F1, F2 are particularly well visible due to the high-energy burst recording. Data areas outside the burst ATF section can be seen in the upper image area.
  • Fig. 1 shows the signal separated at the filter output of the selection stage for pilot tone F1, which was read by the head 2 after appropriate amplification.
  • the higher burst ATF amplitude can be clearly seen, but also the short time period in which the evaluation must take place.
  • FIG. 3 shows the areas defined in the DVC standard in track format, burst ATF and embedded ATF alternating within an active write area of a track.
  • a burst ATF area that has already been written is no longer deleted, new sections (inserts) are only inserted after it.
  • the ITI area (.Insert and Track Information) contains the burst ATF section and important information for the subsequent track organization.
  • Area 2 (margin) contains no relevant data and represents a security area.
  • Area 3 (post-amble) marks the end of the one used Recording section.
  • the post-amble (area 5) marks the end of the ITI area, the pre-amble (area 8) announces it.
  • TAA Track Information Area
  • SSA S_tart-S_ynchblock-Area
  • FIG. 4 shows the block diagram of the system according to the invention.
  • the head drum T with the heads 1 and 2 is controlled by the scanner driver 10, which receives its input information from the servo microcontroller 11 via sc-control 12. Information about the speed and phase of the motor is created on a combined signal line sc-FG / PG on the microcontroller.
  • the belt propulsion takes place via the capstan 13, which is controlled by the capstan driver 14, which in turn receives its input information from the servo microcontroller 11 through the output C-control 19.
  • the information about the current tape feed speed is obtained directly on the circumference of the motor via a magnetic speedometer, the pick-up coil 20 of which is shown above the three-strand motor coil package, and is connected to the servo microcontroller 11 via the line c-FG.
  • the ATF signal for phase control of the tape feed is obtained from the playback signal, which is read from the tape with the head and amplified.
  • the ATF processing 12 provides the pilot tone signals ATF +/- at analog / digital converter inputs of the servo microcontroller.
  • the ATF hold state is triggered via line DMA 1, the signals DMA control the switching processes at the head amplifiers.
  • the position and length of the DMA / DMA1 signals depend on the operating state from the head drum position of the servo Microcontrollers determined and changed. Also shown are the playback head 15, the playback head amplifier 16, the unit equalizer, PLL and detection 17 with the outputs clock and data.
  • the ATF signal processor 18 has the filters for the pilot tones, the nominal frequency values being indicated, but these can vary in the case of special operators.
  • a signal according to FIG. 1 can be measured at the output of the filter.
  • the outputs of the rectifier stages G are followed by "sample and hold" S / H stages, the output signals of which are processed directly by the servo microcontroller 11 as tracking information for phase control of the tape feed.
  • the modules shown in FIG. 4 are also shown.
  • FIG. 7 shows the evaluation voltage of a pilot tone filter for the playback state.
  • the signals shown are the playback amplifier signal Pbs, the filtered signal fil, at 697.5 kHz and processed signal aft.
  • the increase in amplitude during the burst ATF phase A can be clearly seen.
  • embedded ATF B or burst ATF A can be evaluated, whereby the crosstalk of the neighboring tracks is used.
  • FIG. 8 shows the signals at the filter outputs for search speed.
  • the signals shown are the filter output FA1 at 465 kHz, the head amplifier output HA and the filter output FA2 at 697.5 kHz. In this operating mode, only the burst ATF pulse from the main track is evaluated.
  • a phase synchronization between the head drum servo system and the tape feed servo system is carried out, in which the position of the read burst ATF information / s, based on the head switching signal, is used as a measured variable for the phase deviation.
  • a separate target variable is specified for each search speed.
  • the burst ATF sections are detected by comparing the amplitude with the mean value of the embedded ATF information.
  • the filters are tracked, the clock pulse obtained from the data in a PLL being available as the manipulated variable, or the servo system specifying the control information and a reference clock pulse being used.
  • a phase synchronization between the read head position and the tape feed drive is carried out, the temporal position of a predetermined level difference of the output signal of the tracking signal processing in relation to the position of the head switching signal being used as measurement information.
  • Pilot carrier frequency is evaluated.
  • the level difference between embedded ATF and burst ATF signals is determined by the servo control system.
  • the amplitude reference value is changed.
  • the change in the center frequency of the bandpass filter is compensated for the pilot tone frequency filtering in the search mode.
  • the filters have a fixed reference and the center frequency via the servo system is tracked in a defined manner.
  • the filters get their reference from the resynchronized data clock.
  • the phase synchronization, head switching signal generation and ATF evaluation are carried out by a microcontroller.
  • the signal STXT (Servo tone exceeds treshhold) is routed to an edge-sensitive input of the microcontroller.
  • the signals STHA (Servo tone high amplitude) and STLA (Servo tone low amplitude) are routed to level-sensitive inputs of the microcontroller.
  • Low / high indicate only lane deviations, ie deviating from the center of the lane in one direction means increasing STHA and reducing STLA. Deviation in the other direction means reducing STHA and increasing STLA.
  • FIG. 9 shows the playback signal Pb, which is separated at the output of the selection stage for the pilot tone frequency Pf 465 kHz, and the signal S available after the peak value rectification.
  • the high burst ATF amplitude A can be seen at the beginning of the track.
  • FIG. 10 shows the search information interleaving method used in the DVC standard for MPEG recording.
  • an amount of data D is interleaved in the recording tracks for the search.
  • the servo system must ensure that the points of the reading phases are filled with relevant data information. Image sequences with low detail resolution are formed in the MPEG decoder from the completely read information.
  • FIG. 11 shows the block diagram of the ATF filter solution according to the invention.
  • the input signal E (sum pilot signal) is fed to the bandpass filters BF. Downstream are rectifiers GL and high-frequency filters H.
  • the ATF pilot tone amplitudes are available simultaneously at the outputs STHA and STLA.
  • the ATF pilot signals are fed to a comparator V, it being possible to use a multiplexer M to select which pilot carrier frequency is to be evaluated.
  • a comparison amplitude is defined by the digital analog converter (DAC) controlled by the servo system, the level of which changes when the STXT output is exceeded or undershot.
  • the bandpass filters BF are shown for a design with center frequency tracking via serial registers SR and internal digital analog converter. Also shown are a programmable amplifier PV, an operational amplifier OP at whose output the Siganl STDA is present.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

On connaît le procédé qui consiste à intercaler des tonalités pilotes dans des pistes de données à des fins d'alignement dans des appareils d'enregistrement et de lecture numérique de pistes en spirale de données audio, vidéo et autres. Les tonalités pilotes peuvent être intercalées par couplage de fréquences (a) ou par superposition (b) en même temps que les données sont enregistrées. L'objet de l'invention est de créer un système d'enregistrement et de lecture de pistes en spirale qui se caractérise par un alignement aisé. A cet effet, le signal d'alignement automatique est généré dans un composant de filtrage qui redresse également les tonalités pilotes filtrées. Les deux valeurs de tension continue sont lues et traitées dans un microprocesseur asservi de commande avec des convertisseurs analogiques/numériques. Le système asservi génère des impulsions synchronisées avec la rotation du tambour de tête qui font alterner l'alignement automatique entre un mode direct et un mode de maintien, de sorte que le microprocesseur de commande puisse effectuer l'évaluation pendant la phase rapide des salves d'alignement automatique. L'invention est particulièrement utile dans des magnétoscopes numériques.
EP96914947A 1995-04-28 1996-04-19 Appareil d'enregistrement et de lecture de pistes en spirale de donnees Ceased EP0823113A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE1995115074 DE19515074A1 (de) 1995-04-28 1995-04-28 Schrägspuraufnahme-/ und Wiedergabegerät für digitale Daten
DE19515074 1995-04-28
DE19535226 1995-09-28
DE19535226 1995-09-28
PCT/EP1996/001632 WO1996034385A1 (fr) 1995-04-28 1996-04-19 Appareil d'enregistrement et de lecture de pistes en spirale de donnees

Publications (1)

Publication Number Publication Date
EP0823113A1 true EP0823113A1 (fr) 1998-02-11

Family

ID=26014611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914947A Ceased EP0823113A1 (fr) 1995-04-28 1996-04-19 Appareil d'enregistrement et de lecture de pistes en spirale de donnees

Country Status (7)

Country Link
US (1) US6094319A (fr)
EP (1) EP0823113A1 (fr)
JP (1) JPH11509026A (fr)
KR (1) KR100392066B1 (fr)
CN (1) CN1144202C (fr)
AU (1) AU5689996A (fr)
WO (1) WO1996034385A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6094319A (en) * 1995-04-28 2000-07-25 Deutsche Thomson-Brandt Gmbh Method and apparatus for tracking a helical track recording

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7801318A (nl) * 1978-02-06 1979-08-08 Philips Nv Werkwijze voor het regelen van de positie van een schrijf-leeskop en inrichting voor het uitvoeren van de werkwijze.
JPS6318565A (ja) * 1986-07-11 1988-01-26 Pioneer Electronic Corp デジタル信号記録再生装置
JP2537498B2 (ja) * 1986-09-20 1996-09-25 パイオニア株式会社 回転ヘツド式デジタルオ−デイオ再生装置
JPH0740340B2 (ja) * 1988-09-05 1995-05-01 三菱電機株式会社 ヘリカルスキャン方式テープ再生装置のトラッキング制御回路
DE69419646T2 (de) * 1993-03-03 2000-04-13 Matsushita Electric Industrial Co., Ltd. Signalaufzeichnungs- und Wiedergabegerät
JP3420286B2 (ja) * 1993-05-28 2003-06-23 キヤノン株式会社 記録再生装置
JPH087408A (ja) * 1994-06-24 1996-01-12 Hitachi Ltd トラッキング制御装置
EP0646915A3 (fr) * 1993-10-01 1995-11-29 Hitachi Ltd Système de commande de suivi des pistes automatique dans un système d'enregistrement/reproduction magnétique d'un signal numérique.
US6094319A (en) * 1995-04-28 2000-07-25 Deutsche Thomson-Brandt Gmbh Method and apparatus for tracking a helical track recording

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9634385A1 *

Also Published As

Publication number Publication date
WO1996034385A1 (fr) 1996-10-31
CN1144202C (zh) 2004-03-31
CN1183159A (zh) 1998-05-27
US6094319A (en) 2000-07-25
JPH11509026A (ja) 1999-08-03
KR19990008136A (ko) 1999-01-25
KR100392066B1 (ko) 2003-11-20
AU5689996A (en) 1996-11-18

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