WO1984000636A1 - Procede et dispositif de montage de bandes magnetiques - Google Patents

Procede et dispositif de montage de bandes magnetiques Download PDF

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Publication number
WO1984000636A1
WO1984000636A1 PCT/US1983/001145 US8301145W WO8400636A1 WO 1984000636 A1 WO1984000636 A1 WO 1984000636A1 US 8301145 W US8301145 W US 8301145W WO 8400636 A1 WO8400636 A1 WO 8400636A1
Authority
WO
WIPO (PCT)
Prior art keywords
tape
head
erase
record
playback
Prior art date
Application number
PCT/US1983/001145
Other languages
English (en)
Inventor
Frederick L Mills Iii
Original Assignee
Frederick L Mills Iii
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 Frederick L Mills Iii filed Critical Frederick L Mills Iii
Publication of WO1984000636A1 publication Critical patent/WO1984000636A1/fr

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Classifications

    • 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
    • G11B27/029—Insert-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
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
    • G11B27/13—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier the information being derived from movement of the record carrier, e.g. using tachometer

Definitions

  • the invention relates to tape recorders which are utilized to record information on a magnetic tape and to play back the information which is stored on the tape. More particularly, the invention relates to an. apparatus and method for adding newly recorded material to a previously recorded tape, so that the newly recorded material starts at a precisely determined position on the tape and is recorded in a manner that avoids playback distortion at the beginning of the added recording.
  • music or other audible sounds may be recorded and reproduced with high fidelity on magnetic tape recording machines.
  • Such machines utilize an erase head and a spaced recording head to respectively erase and record audio signals on a moving magnetic tape.
  • a magnetic tape is initially moved over the erase head so that any previously recorded audio signals are erased and the tape is then moved over the record head to selectively induce in the tape a magnetic field that corres ⁇ ponds to the sound being recorded.
  • the erase head is deactivated and the tape is moved over a play ⁇ back head which senses the magnetic field of the tape and generates a corresponding electrical signal which is applied to reproduce the recorded sound.
  • the sensing or playback head may be the same head as was employed to record magnetic signals on the tape or may be an independently operable head that is positioned adjacent to the record head.
  • the tape In adding a new audio recording to a previously recorded tape, the tape is initially positioned so that a desired start-edit point of the old recording is over the record head. The new recording is then started at this point.
  • a start-edit point on the tape is posi ⁇ tioned over the record head and the tape recorder is then activated to begin recording new audio signals from this point.
  • the erase head operates to erase the previously recorded material and the recording head operates to record the new material.
  • the pre ⁇ viously recorded portion of tape which lies between the start-edit point and a point initially positioned over the erase head does not move over the erase head in the editing process and is therefore not erased.
  • This segment of tape instead passes over the record head so that the segment has new audio signals recorded over the previously recorded audio signals. The playback of the combined signals produces a garbled or distorted sound.
  • Another object of the invention is to provide such an apparatus and method which insures that the leading por ⁇ tion of a previously recorded tape segment is erased before it reaches the record head to record new audio signals.
  • Another object of the invention is to provide such a system wherein positioning of the start-edit point is achieved by causing the tape transport apparatus of a re ⁇ corder to selectively move tape slowly over the playback head in the playback mode.
  • a further object of the invention is to provide a tape editing apparatus with a tape transport mechanism that precisely positions a start-edit point of a tape over a re ⁇ cord head and an edit control mechanism which operates auto- matically to insure that the leading portion of an edited segment of the tape does not contain overlapping audio sig ⁇ nals.
  • the tape edit ⁇ ing method and apparatus of the invention includes a mech ⁇ anism for selectively moving the magnetic tape of a tape recorder in a reverse or forward direction with respect to a playback head.
  • the speed of movement is sufficiently slow to allow monitoring of the tape and precise stopping of the tape at a desired start-edit point.
  • An edit control mechanism is provided to insure that the tape segment between the erase head and the start- edit point is erased before edit recording of the tape is started.
  • the desired start-edit point of the tape is initially positioned over the playback head.
  • an edit function switch is selected to initiate an automatic erase sequence for the edit.
  • the erase sequence starts when a pinch roller presses the magnetic tape of the recorder against a rotating capstan which then moves the tape backward.
  • a counter is reset to zero and thereafter begins counting the rotations of the capstan to a predefined count state which is reached when the backwardly moving start-edit point reaches the erase head.
  • the control circuit disengages the pinch roller and stops the backward movement of the tape so that the start-edit point is posi ⁇ tioned over the erase head. Thereafter, the direction of rotation of the capstan is reversed and the pinch roller is again engaged with the tape and capstan to move the tape forward.
  • the coun ⁇ ter When the pinch roller engages the capstan the coun ⁇ ter is again reset to zero and begins counting the rotations of the capstan to a predetermined count state which is reached by the counter when the start-edit point of the tape moves forward from the erase head to the record head. As " the tape moves forward the erase head is activated and the record head is deactivated. When the counter indicates that the start-edit point of the tape has reached the record head, the pinch roller is disengaged and the forward movement of the tape is stopped. At this point the tape between the record head and the erase head has been erased.
  • the recording function is thereafter initiated to record new audio signals on the tape.
  • FIGURES 1A-1B show a diagrammatic perspective view of the relation between a previously recorded magnetic tape, erase head and record/playback head in a prior tape editing system.
  • FIGURES 2A-2C show a diagrammatic perspective view of the relation between a previously recorded magnetic tape, record/playback head and erase head in the tape editing sys ⁇ tem of the invention.
  • FIGURES 3A-3D show a diagrammatic perspective view of the relation between a previously recorded magnetic tape, record head, playback head and erase head in the tape editing system of the invention.
  • FIGURE 4 shows a diagrammatic illustration of a tape recording apparatus which provides the editing features of the invention.
  • FIGURE 5 is a perspective view of a mechanism for monitoring the rotation of the capstan of the tape recording apparatus of FIG. 4.
  • FIGS. 1A and IB show a perspective view of a mag ⁇ netic tape 1 of a prior art tape recorder in relation to an erase head 3 and a record/playback head 5 of the recorder.
  • FIGS. 1A and IB are not drawn to scale and are provided mere ⁇ ly to show the relative longitudinal orientation of the heads 3 and 5.and associated tape 1 in a prior art tape editing system.
  • the cross-hatched lines of the tape 1 indicate that the tape has audio information recorded on its illustrated segment.
  • the tape is positioned to record new audio signals, beginning at a start-edit point Tl.
  • FIG. IB illustrates the condition of the tape 1 after it has been moved forward a distance in the direction of the arrow 7 to record new audio signals from the start- edit point Tl.
  • the tape is moved forward in a manner known to the art and the head 5 is operated to record
  • OMPI ⁇ .. ⁇ ?o the desired audio signals on the tape, while the erase head 3 is operated to erase the tape.
  • the new audio signals are indicated by cross hatching which is angled differently than the cross hatching of the previously recorded material of FIG. 1A.
  • the new audio signals are recorded over the old audio signals on the segment of tape between the points Tl and T2 and therefore, when the tape is rewound and played, the portion of the tape between Tl and T2 will produce a distorted sound.
  • the tape after the point T2 has a proper new recorded signal because the erase head 3 operated to erase this section of the tape before it reached the recording head 5.
  • FIGS. 2A, 2B and 2C illustrate the tape editing method of the invention.
  • the tape 1 is ini ⁇ tially positioned for editing as shown in FIG. 1A.
  • an automatic editing sequence is initiated to provide the tape movement illustrated in FIGS. 2A-2C.
  • the start-edit point Tl of the tape 1 is initially automatically moved in the direction of the arrow 9 from the record/playback head 5 to the erase head 3, at which point the tape is stopped.
  • the " erase head 3 is activated
  • the record/playback head 5 is de ⁇ activated and the tape 1 is moved forward in the direction of an arrow 7 until the start-edit point Tl is again over the record/playback head 5.
  • FIGS. 3A, 3B, 3C and 3D illustrate the operation of the editing system of the invention with a recording mech ⁇ anism that utilizes an erase head 3 and a separate record head 17 and playback head 19.
  • FIG. 3A, 3B, 3C and 3D illustrate the operation of the editing system of the invention with a recording mech ⁇ anism that utilizes an erase head 3 and a separate record head 17 and playback head 19.
  • 3A illustrates the posi- tioning of the previously recorded tape 1 in relation to the heads 3, 17 and 19 when the tape is set to begin adding an edited segment at the start-edit point Tl.
  • the start-edit point Tl is positioned over the play head 19 and according to the convention established above, the point over the erase head 3 is designated T2.
  • the tape When the automatic editing sequence is initiated the tape is moved backward in the direction of the arrow 9 until the start-edit point Tl is positioned over the erase head 3. Thereafter, as shown in FIG. 3C, the tape is moved forward with the erase head operating and the record and play heads deactivated. The forward movement of the tape is stopped when the start-edit point Tl is opposite the record head 17. At this point the erase head 3. has erased the seg- - ment of tape between the point Tl and a point T3. The tape is thereafter started to begin recording the new edited segment with the erase head 3 operating to erase tape and the record head 17 operating to record audio signals on the tape. As shown in FIG. 3D, there is no dis ⁇ tortion between the points Tl and T2 of the tape.
  • FIGS. 3A-3D may be implemented by a tape recording apparatus illustrated in diagrammatic form in FIG. 4. It should gener ⁇ ally be understood that FIG. 4 is illustrative of an embodi ⁇ ment of a tape recorder that will provide the desirable edit- ing features of the invention, but is not the sole means by which the functions of the invention may be achieved. As will be apparent to those skilled in the art, the invention may be embodied in other apparatus known in the art. The apparatus of FIG. 4 is therefore illustrative and not limit- ing.
  • magnetic tape 1 is moved from a supply reel 21 to a take-up reel 23 in either the recording or playback operation of the appara ⁇ tus.
  • An erase head 3 and a record/playback head 5 operate to respectively erase and record or play in a manner known to the art.
  • a capstan 25 is rotated by a capstan motor 27 -5 to precisely move the tape between the supply reel 21 and take-up reel 23.
  • a supply reel motor 29 and take-up reel motor 31 operate to turn their respective reels and thereby provide the tension required to move the tape smoothly over the erase head 3 and record/playback head 5. 0
  • the capstan 25 engages and thereby moves the tape
  • the capstan motor 27 can rotate the capstan 25 to move the tape 1 in the forward direction of the arrow 7 or the reverse direction of the arrow 9. More particularly, the motor 27 will turn the capstan in a counterclockwise 0 direction with respect to the drawing of FIG. 4 to move the tape in the forv/ard direction of the arrow 7 and will rotate the capstan in the clockwise direction to move the tape iri the reverse direction indicated by the arrow 9.
  • a capstan transducer 41 generates either one elec- 5 trical signal or a fixed number of signals for each rotation of the capstan.
  • the signals from the transducer 41 are applied through a tape transport control 47 to a counter 43 which counts the number of signals and hence the number of rotations of the capstan.
  • a brake mechanism 45 such as is known in the art is provided to quickly stop the supply and take-up reels 21 and 23 when the pinch roller 33 is disengaged from the cap ⁇ stan 25.
  • the tape transport control mechanism 47 is pro- 5 vided to control the operation of the take-up and supply reel motors, the direction of rotation and speed of the cap ⁇ stan motor 27, the actuation of the solenoid 35 and brake mechanism 45 and the activation of the erase head 3 and record/playback head 5.
  • the tape transport control 47 operates in accordance with instructions that are received from button-actuated control select switches including a stop switch 48, record switch 49, play switch 51, rewind switch 53, fast forward switch 55, edit enable switch 57 and precision edit switch 59.
  • the tape ' transport control 47 may include a micro ⁇ processor and a suitable interface circuit for receiving status signals from the various components of the system and generating control signals to operate the components.
  • a microprocessor could, for example, include the counter 43 and a memory device for storing the required count state of the counter and the program steps for the above-described automatic edit sequence.
  • the microprocessor could utilize a quartz clock to provide the necessary timing signals for the system.
  • simultaneous pressing of the record and play switches 49 and 51 will cause the tape 1 to be moved in the forward direction 7 for normal recording of audio signals.
  • the tape is erased as it moves over the activated erase head 3 and the record/playback head 5 is operated to selectively magnetize the tape to re ⁇ cord audio signals.
  • the tape is moved forward in the normal record mode when the tape transport control 47 energizes the sole ⁇ noid 35 and thereby causes the pinch roller 33 to press the tape 1 against the capstan 25.
  • the tape transport control 47 operates the motor 27 to rotate the capstan at a desired recording speed in the counterclockwise direction and oper ⁇ ates the motors 29 and 31 to control the unwinding and wind ⁇ ing of tape on the reels 21 and 23.
  • the above-described recording operation of the apparatus of FIG. 4 is stopped by pressing the stop switch 48.
  • the activation of the stop switch 48 causes the tape transport control 47 to deenergize the solenoid 35 and there ⁇ by disengage the pinch roller 33 and capstan 25.
  • OMPI and supply reel motors 29 and 31 are also deenergized and, when the pinch roller 33 is disengaged, the brake mechanism 45 is actuated to stop the supply and take-up reels.
  • the rewind switch 53 may be selected to instruct the tape transport control 47 to operate the motors 29»and 31 in a manner known to the art to quickly wind tape from the take-up reel 23 to the supply reel 21.
  • the fast forward switch may be pressed to cause the tape transport control 47 to operate the- reel motors 29 and 31 to quickly wind tape from the supply reel to the take-up reel.
  • the edit enable switch 57 is pressed when it is desired to precisely position a start-edit point of the tape 1 adjacent to the record/playback head 5 and to provide an automatic sequence of controlled tape movements which prepare a tape for editing.
  • the edit mode and any associated editing operations can be terminated at any time during an edit se ⁇ quence by pressing the edit enable switch 57 an additional time.
  • the tape will stop and the control 47 will return the recorder to normal record ⁇ ing and playback operation.
  • the edit enable switch is pressed -to define a tape edit mode for the tape transport control 47. Thereafter either the rewind switch 53 or fast forward switch 55 may be actuated to move the tape at a relatively slow speed in a selected direction. More particularly, in the edit mode the tape transport control 47 energizes the sole ⁇ noid 35, which causes the pinch roller to engage the rotating capstan 25 and thereby moves the tape 1 at a predefined speed and in a direction determined by the actuation of either the rewind or fast forward switch. For as long as the fast for ⁇ ward switch is pressed, the tape is moved in a forward direc ⁇ tion slowly over the head 5 and the audio signals produced by the head 5 are monitored by speakers (not shown).
  • an operator can monitor the contents of the slowly moving tape and thereby readily identify the start-edit point at which he wishes to insert new audio material.
  • the operator monitors the start-edit point, he releases the fast forward switch 55 to stop the tape and to thereby place the tape in the position shown at FIG. 1A. If the tape moves forward beyond the start-edit point, the rewind switch is pressed to cause the tape to slowly move backward for as long as the switch is pressed.
  • start-edit positioning system will enable an operator of a cassette recorder to precisely define the starting point for an edited segment of tape.
  • This edit positioning system also has application for reel-to-reel recorders which have heretofore been set at edit positions by manually manipulat ⁇ ing relatively bulky reels.
  • the above-described system for defining a start- edit position utilizes relatively slow moving capstan and reel motors to provide the required continuous slow tape movement for as long as either of the switches 53 or 55 are pressed in the edit enable mode.
  • a different mode of operation may be provided by modifying the control 47 to move the tape at a relatively slow speed, for example one half of normal playback speed, when the fast forward switch 55 is initially pressed in the edit enable mode. If the switch remains pressed, the control 47 automatically increases the speed of movement of the tape to a predefined maximum, for example two times normal play ⁇ back speed.
  • the rewind switch 54 operates in a similar fashion in the edit enable mode to initially move the tape backward at a predefined slow speed which is automatically increased to a predefined maximum speed while the switch 53 is pressed. In such a modified system a tape is quickly scanned to determine a rough position for the start-edit point and thereafter the rewind and fast forward switches are operated to move the tape back and forth within the area of interest. When the start-edit point of the tape 1 has been precisely located over the record head 5 the depressed fast forward or rewind switch is released to stop the tape in the
  • the precision edit switch 59 is pressed to initiate the following sequence of automatic tape-editing operations.
  • the tape transport control 47 initially operates the capstan motor 27 to rotate the capstan 25 to a predetermined speed in the clockwise direction and then engages the pinch roller 33 with the capstan 25 to move the tape 1 in the reverse direction indicated by the arrow 9.
  • the microswitch 61 is operated to signal the engagement to the tape transport control 47.
  • the tape transport control 47 then resets the counter 43 to an initial count state, for example a zero count state.
  • the capstan transducer 41 gener- ates a predetermined number of signals for each rotation of the capstan 25 and these signals are applied to increment the counter 43.
  • the counter 43 counts the signals from the capstan transducer 41 and generates a tape stop output signal when a predetermined number of counts is reached.
  • the pre- determined number of counts corresponds to the distance be ⁇ tween the record/playback head 5 and erase head 3.
  • the counter 43 generates a tape stop output signal when the start-edit point Tl of FIG. 2A is positioned over the erase head 3.
  • the stop-tape signal from the counter 43 is applied to the tape transport control 47 which then disengages the pinch roller 33 from the capstan 25, stops the reel motors 29 and 31 and actuates the brake mechanism 45 to stop the reels 21 and 23.
  • the start-edit point Tl of the tape 1 is at the position shown in FIG. 2A.
  • the tape transport control 47 thereafter reverses the direction of rotation of the capstan 25 so that the cap ⁇ stan rotates at a predetermined speed in the counterclockwise direction with respect to FIG. 4.
  • the solenoid 35 is then energized again so that the pinch roller 33 engages the cap ⁇ stan 25 and the microswitch 61 signals the engagement.
  • the control 47 resets the counter 43 ' when it receives the pinch roller engagement signal from the microswitch 61.
  • the capstan transducer 41 generates signals which are coun ⁇ ted by the counter 43 as the tape 1 moves in the forward direction of the arrow 7.
  • the tape transport control 47 also deactivates the record/play ⁇ back head 5 and activates or energizes the erase head 3.
  • the tape that passes over the erase head 3 is erased as it moves in the forward direction and the tape that passes over the record/playback head 5 is unaffected.
  • the counter 43 reaches its pre ⁇ determined count state and generates a tape stop output sig ⁇ nal to the control 47 to indicate the end of the automatic edit sequence.
  • the tape transport control 47 therefore dis- engages the pinch roller 33, stops the capstan motor 27 and take up reel motors 29 and 31 and actuates the brake mechan ⁇ ism 45 to stop the tape in the position shown in FIG. 2B.
  • the control 47 then automatically returns the recorder to its normal operational mode.
  • the edit enable switch may be pressed to terminate the edit sequence at any time before the automatic end of edit point is reached.
  • the tape recording apparatus of FIG. 4 will remain in its disengaged and stopped position until the record and play buttons are simultaneously pressed to start recording the new edited material on the tape.
  • the edited material will be provided on the tape following the point Tl and there will be no signal distortion between the points Tl and T2.
  • the mechanism of FIG. 4 has been described with respect to an erase head and a single additional head that incorporates both the record and playback functions. It should be understood that the mechanism could be easily modi ⁇ fied to operate with an erase head and separate record and playback heads. In this case the system would operate to move the tape in the manner described with respect to FIGS. 3A-3D.
  • the counter 43 would count to a first count state to move the start-edit point Tl backward from the playback head 19 to the erase head and would count to a second count state to move the point Tl from the erase head to the record head 17.
  • the apparatus of FIG. 4 would necessarily be modified so that the counter 43 would generate a tape stop Output signal at the first count state when the tape is moving in the reverse direction and at the second count state when the tape is moving in the forward direction. This change in operation could be easily implemented for the tape transport control of FIG. 4.
  • FIG. 5 illustrates a perspective view of a capstan transducer mechanism that could be employed to generate sig- nals corresponding to the rotation of the capstan.
  • the capstan 25 is supported on a capstan flywheel 63 which is rotated by the capstan motor 27.
  • a light-emitting diode 65 is supported over the flywheel 63 and directs a continuous beam of light adjacent to but spaced from the outer periphery of the flywheel. The beam of light is re ⁇ ceived by a phototransistor 67 which is disposed opposite the LED.
  • An opaque tab 69 is affixed to the outer rim of the flywheel 63, for example by an adhesive, to periodically interrupt the beam of light from the LED 65 to the photo- transistor 67 as the flywheel rotates. The interruptions in the beam thereby provide an indication of the rotation of the flywheel.
  • a single tab is pro ⁇ vided to interrupt the beam once for each rotation of the flywheel.
  • any number of tabs can be employed to provide any predeter ⁇ mined number of interruptions of the beam for each rotation of the flywheel.
  • the phototransistor 67 generates a signal for each interruption of the beam in a manner well-known to the art and applies the signal to the input of- the counter 43 through the tape transport control 47.
  • the coun ⁇ ter counts the signals from the phototransistor 67 and gener ⁇ ates an output signal when a predetermined count state is reached.
  • the optical trans ⁇ ducer of FIG. 5 may be constructed in many different ways.
  • one or more passages could be drilled through the flywheel 63 to intermittently pass the light of the LED 65 to the phototransistor 67.
  • the flywheel 63 could be painted black and reflecting strips could be adhered at the periphery of the flywheel to intermittently reflect the beam of light from the LED to a phototransistor posi ⁇ tioned on the same side of the flywheel as the LED. It will be appreciated by those skilled in the art that other types of transducers could be used without depart ⁇ ing from the invention.
  • one or more magnets- could be mounted at the periphery of the flywheel 63 and a coil could be positioned in spaced relation to the flywheel to detect the fields of the rotating magnets.
  • the flywheel could periodically actuate a mechanical switch and thereby provide the required electrical signal indicative of the number of rotations.
  • the apparatus of FIG. 4 was described with respect to the operation of a single capstan 25 that is rotated in opposite directions to change the direction of movement of the tape 1. It should be understood that the invention is not limited to such a single capstan system.
  • the ap ⁇ paratus of the invention could include two or more capstans operating to move the tape in desired directions.
  • the capstans would rotate in a manner known to the art to define opposite directions of movement of the tape.
  • the capstan.25 illustrated in FIG. 3 would rotate in a known manner in association with an addi ⁇ tional capstan to move the tape in the forward direction of the arrow 7.
  • the tape transport control 47 would operate the capstan motors to provide a desired speed and direction of tape motion for the above-described opera ⁇ tional modes of the recorder.
  • the invention has been particularly described with respect to an audio tape recording system. However, the invention may also be used to advantage in video tape systems to avoid recording undesirable overlapping signals at a lead ⁇ ing portion of an edited segment of video tape.
  • the inven ⁇ tion is therefore not limited to audio applications and may be embodied in many other forms without departing from its spirit or essential characteristics.
  • the present described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the in ⁇ vention being indicated by the claims rather than by the foregoing description. All changes which come within the meaning and range of the equivalents of the claims are there ⁇ fore intended to be embraced therein.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Management Or Editing Of Information On Record Carriers (AREA)

Abstract

Un dispositif amélioré d'enregistrement de bandes est utilisé pour enregistrer de nouvelles informations sur une bande déjà enregistrée (1) sans créer un enregistrement présentant des distorsions ou des mutilations dans la portion d'attaque du segment de bande nouvellement enregistrée. Lors du fonctionnement, les commandes de transport de bandes (47) de l'enregistreur sont actionnées pour faire défiler la bande (1) lentement sur la tête de reproduction (5) en mode reproduction. La bande (1) est contrôlée et arrêtée lorsqu'un point désiré de départ-édition est positionné sur la tête de reproduction. Une commande d'édition automatique (57) fait alors revenir en arrière la bande (1) d'une distance donnée sans enregistrement, de sorte que le point de départ-édition est décalé depuis la tête de reproduction (5) à la tête d'effacement (3). Ensuite la tête d'enregistrement (5) de l'enregistreur est désactivée, la tête d'effacement (3) est activée et la bande (1) défile vers l'avant jusqu'à ce que le point de départ-édition soit à nouveau positionné devant la tête d'enregistrement (5) et le segment de bande entre la tête d'enregistrement et la tête d'effacement (3) est effacé. L'enregistreur est alors activé pour commencer l'enregistrement de nouvelles informations à partir du point de départ-édition.
PCT/US1983/001145 1982-07-30 1983-07-27 Procede et dispositif de montage de bandes magnetiques WO1984000636A1 (fr)

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US40435182A 1982-07-30 1982-07-30

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283745A (en) * 1980-04-11 1981-08-11 Sony Corporation Editing apparatus
US4351007A (en) * 1979-08-20 1982-09-21 Minnesota Mining And Manufacturing Company Editor for combining digitally recorded audio signals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4351007A (en) * 1979-08-20 1982-09-21 Minnesota Mining And Manufacturing Company Editor for combining digitally recorded audio signals
US4283745A (en) * 1980-04-11 1981-08-11 Sony Corporation Editing apparatus

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