JPH08194994A - Tracking error information detector for vtr and vtr equipped therewith - Google Patents

Abstract

PURPOSE: To detect tracking error information from the output signal of an integrated circuit for outputting good signals selectively among signals read out through a double azimuth head. CONSTITUTION: Inclination angle of the central shaft of a drum is set such that the rotary locus plane of a rotary magnetic head is aligned with the recording locus at the time of trick play. Recorded information is then read out from a magnetic tape by means of a double azimuth head and the output from an integrated circuit board, producing a readback signal having higher signal level, is detected through an amplitude detection circuit 6 before being fed through an integrator 7i to a peak hold circuit 7p. The integrator is reset by a signal RST to allow the operation for integrating a signal being detected and read out through one head selected by a head selection signal HDSW but interrupt the operation for integrating the detected readout signal during an interval when the other head is selected by a head selection signal. The peak hold circuit is provided with an output from the integrator, i.e., the level signal read out through one head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a VTR for selectively using a good signal among reproduced signals from two magnetic heads arranged adjacent to each other and having different azimuth angles.
And a VTR equipped with the tracking error information detecting device.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of the peripheral surface of a drum composed of an upper drum and a lower drum is run at a predetermined running speed, and a recording / reproducing operation is performed by using a rotary magnetic head. Video tape recorder
In the (VTR), as one means for achieving high density recording, successive recording marks on a magnetic tape are recorded and reproduced by rotary magnetic heads having different azimuth angles. That is, in the above VTR,
A rotating drum having a pair of rotating magnetic heads having opposite azimuth angles at 180-degree symmetric positions is rotated at a predetermined rotation speed, and is inclined to at least a part of the peripheral surface of the drum. The magnetic tape running at a predetermined running speed V in a state where the position of the reference edge of the magnetic tape wound around the drum is regulated by the guide portion provided on the drum is sequentially and alternately helically rotated by the pair of rotary magnetic heads. When scanned, in response to the 180 ° rotation of each rotary magnetic head in the pair of rotary magnetic heads described above, a sequential recording mark by the video signal of the sequential 1-field period in the video signal to be recorded is recorded. , Are sequentially formed on the magnetic tape in a state of being adjacent to each other, or the recorded information in the recording trace is reproduced.

By the way, the pattern of recording marks formed on the magnetic tape by the rotary magnetic head is the relative linear velocity between the rotary magnetic head and the magnetic tape, the surface of the rotary locus of the rotary magnetic head and the magnetic tape. Determined by the angle formed by the reference edge of. In using the VTR, in addition to normal reproduction (normal reproduction) in which the recording information is reproduced at the same magnetic tape traveling speed as during recording, the traveling speed and traveling direction of the magnetic tape during recording are also referred to. Although trick play is also performed in which a magnetic tape is run at different running speeds and running directions to perform a reproducing operation, it is well known that the rotational trajectory of the rotary magnetic head differs as the running speed of the magnetic tape changes.

That is, the rotation locus of the rotary magnetic head drawn on the magnetic tape by the rotary magnetic head of the VTR during normal recording / reproduction (normal recording / reproduction) and the rotation drawn on the magnetic tape by the rotary magnetic head during trick play. The rotation trajectory of the magnetic head is, for example, as shown in FIG.
As shown in FIG. The recording track indicated by the frame shown by the solid line in FIG. 12 corresponds to the rotation locus of the rotary magnetic head drawn on the magnetic tape by the rotary magnetic head during normal recording / reproducing (normal recording / reproducing). A recording track indicated by a frame indicated by a dotted line in FIG. 12 is a rotation locus drawn on the magnetic tape by the rotary magnetic head during trick play, and a hatched area in the drawing indicates a recording on the magnetic tape. The region where a reproduction signal is generated from the rotary magnetic head having the same azimuth angle as the rotary magnetic head used for forming the trace is shown.

As described above, during trick play, the rotary locus of the rotary magnetic head traverses the recording trace. Therefore, the signal level of the frequency-modulated wave signal of the reproduced signal reproduced from the rotary magnetic head is recorded by the rotary magnetic head. The state of the rotary head changes greatly every time it crosses the track.
6A, the envelope of the frequency-modulated wave signal of the reproduction signal in one vertical scanning period in the case of being inclined is as shown by the waveform of PBFM in FIG. 6B, for example. The image shows a large undulation during one vertical scanning period, and the S / N of the reproduced image during trick play deteriorates, resulting in a reproduced image of poor quality. When the S / N is further deteriorated, a noise bar appears in the image.

Therefore, in order to prevent a noise bar from being generated in an image during reproduction even in the reproducing operation in which the traveling speed of the magnetic tape during the reproducing operation is different from the traveling speed of the magnetic tape during the recording operation. From [1]
With a rotary magnetic head having the same azimuth angle as that of the rotary magnetic head formed on the magnetic tape, the trace to be traced on the magnetic tape has a structure capable of favorably tracking the trace on the magnetic tape. Used in VTR. [2] Modulated wave signal form obtained by reproducing in a state where the rotation loci of two rotary magnetic heads arranged adjacent to each other and having different azimuth angles cross the recording marks on the magnetic tape A configuration is adopted in the VTR in which a head reproduction signal having a large signal level is selected from the head reproduction signals and is used as a reproduction signal. Etc. means have been proposed.

Here, a concrete example of [1] of the conventional proposals will be described. For example, an actuator provided in an automatic tracking control system (any of the electrodynamic type, the piezoelectric type, and the electromagnetic type can be used). The rotational magnetic head is driven and displaced according to the following) so that the recording head traces the rotational magnetic head (see, for example, Japanese Patent Laid-Open No. 5-110973), and the inclination of the drum is adjusted according to the running speed of the magnetic tape. By changing the running direction of the magnetic tape and the direction of the rotation locus surface of the rotary magnetic head, the rotary magnetic head is traced to the recording track.
(For example, see JP-A-6-162456), the height of the guide roller of the magnetic tape provided on the inlet side or the outlet side of the drum is defined as the running speed of the magnetic tape in correspondence with the running speed of the magnetic tape. Correspondingly, by changing the running direction of the magnetic tape and the direction of the rotational locus surface of the rotary magnetic head relative to each other, the rotary magnetic head can be traced to a recording mark (for example, Japanese Patent Application No. Flat 5-2
No. 25128), the guide of the magnetic tape provided on the inlet side or the outlet side of the drum corresponding to the traveling speed of the magnetic tape while changing the inclination of the drum corresponding to the traveling speed of the magnetic tape. By changing the height of the roller in correspondence with the running speed of the magnetic tape and changing the running direction of the magnetic tape and the direction of the rotational locus surface of the rotary magnetic head relatively, the rotary magnetic head records. To be tracked (for example, Japanese Patent Application No. 5-75252)
Various specific means such as Japanese Patent Application No. 5-93593) have been proposed.

[0008]

During various trick play operations in a consumer VTR, the running speed of the magnetic tape during the reproducing operation differs from the running speed of the magnetic tape during the recording operation as described above. However, in the conventional consumer VTR, due to the cost problem, the above-mentioned means [2], that is, two adjacent VCRs having different azimuth angles are arranged. The head reproduction signal with a large signal level is selected from among the head reproduction signals in the form of the modulated wave signal obtained by performing reproduction in such a manner that the rotation locus of the rotating magnetic head crosses the recording trace on the magnetic tape. The VTR is generally configured to be used as a reproduction signal so as to improve a reproduced image at the time of various trick play operations at low cost. It was.

However, with respect to consumer VTRs, in recent years, attempts have been made to further improve the image quality of reproduced images of various trick-plays. The adoption of means such as various concrete examples belonging to [1] among the above-mentioned proposals has come to be considered. The applicant company also changes the inclination of the drum and the path of the reference edge of the magnetic tape in correspondence with the running speed of the magnetic tape, so that the running direction of the magnetic tape and the direction of the rotation locus surface of the rotating magnetic head are relative to each other. Of the magnetic head so that the rotary magnetic head can be traced to a recording mark. For example, Japanese Patent Laid-Open Nos. 6-208701 and 6-318.
We are studying the practical application of a VTR having the structure as proposed in Japanese Patent Application No. 351 and Japanese Patent Application No. 6-23406.

By the way, by changing the inclination of the drum and the path of the reference edge of the magnetic tape in correspondence with the running speed of the magnetic tape, the running direction of the magnetic tape and the direction of the rotation locus surface of the rotary magnetic head are relatively changed. By changing the direction of the surface of the rotary locus of the rotary magnetic head relative to the track, the amount of deviation between the locus of the rotary magnetic head and the track of recording is detected in an attempt to trace the track of the rotary magnetic head. However, when it is attempted to automatically control the inclined state of the drum and the position of the path of the reference edge of the magnetic tape so that the above-mentioned deviation amount becomes zero, the rotation locus of the rotating magnetic head is It is necessary to detect information on the amount of deviation from the recording trace. The information on the amount of deviation between the rotation track of the rotary magnetic head and the recording trace can be detected by knowing the magnitude of the head reproduction signal in the form of the modulated wave signal reproduced by the rotary magnetic head.

However, as already mentioned, V for consumer use
In TR, a head reproduction signal having a large signal level is reproduced from a head reproduction signal in the form of a modulated wave signal reproduced from two rotary magnetic heads which are adjacently arranged and have different azimuth angles during a trick play operation. Since an integrated circuit board configured to select a signal and output it as a reproduction signal is used, reproduction is performed from two rotary magnetic heads that are adjacently arranged and have different azimuth angles. Since the head reproduction signal in the form of the modulated wave signal cannot be individually taken out from the integrated circuit board, the rotary magnetic head showing the amount of deviation between the rotary locus of the rotary magnetic head and the recorded trace from the consumer VTR. It is not possible to take out the head reproduction signal in the form of the modulated wave signal which is individually reproduced from. Therefore, in order to further improve the image quality of reproduced images of various trick-plays in the conventional consumer VTR, various concrete examples belonging to [1] of the proposals already described for the consumer VTR are described. Even if I tried to adopt an example, I couldn't, so I needed a solution.

[0012]

According to the present invention, a recording / reproducing operation is performed on a magnetic tape wound on a part of the peripheral surface of a drum by using a rotary magnetic head. When a reproducing operation is performed in a state where the magnetic tape is traveling at a traveling speed different from the traveling speed of the magnetic tape during operation, the rotation locus surface of the rotating magnetic head is made to coincide with the recording trace formed on the magnetic tape. Under the operation of the component functioning as described above, among the head reproduction signals in the form of modulated wave signals reproduced by two rotary magnetic heads arranged adjacent to each other and having different azimuth angles, A detection device for tracking error information in a VTR in which a large head reproduction signal is selectively output from the integrated circuit and is used as a head reproduction signal. Means for obtaining a detected reproduced signal and detecting the reproduced signal, and for each section obtained by dividing one vertical scanning period into N (where N is a natural number of 1 or more), corresponds to the signal level of the detected reproduced signal. Means for generating a level signal, a peak hold circuit for holding the level signal over the length of each section, and a head reproduction signal having a large signal level from the head reproduction signals from the two rotary magnetic heads. By means of the head selection signal used in order to permit the generation of the level signal during the period when one of the predetermined rotary magnetic heads is selected, and by the head selection signal, And a means for stopping the above-mentioned level signal generating operation during a period in which a rotary magnetic head that is not one of the predetermined rotary magnetic heads is selected. Detector of the tracking error information in the VTR made, and V, the
In a tracking error information detecting device in TR, a means for detecting a head reproduction signal output from an integrated circuit to obtain a detection reproduction signal, an integrator for performing an integration operation on the detection reproduction signal, and two rotating magnets. Among the head reproduction signals from the head, a head selection signal used for selecting a head reproduction signal having a large signal level is used to select one of the predetermined rotary magnetic heads during the period when the rotary magnetic head is selected in advance. Means for allowing the integrating operation of the detection reproduction signal in the integrator, and the above-mentioned integration during the period when the rotary magnetic head other than the one predetermined rotary magnetic head is selected by the head selection signal. Means for stopping the integration operation of the detection reproduction signal in the detector and dividing one vertical scanning period by N (where N is a natural number of 2 or more) A device for detecting tracking error information in the VTR, which comprises means for holding the integrated value of the detection reproduction signal at that time point by the peak hold circuit and resetting the integrated value of the integrator at each time point of the end of each section, In addition, among the head reproduction signals in the form of modulated wave signals reproduced by the two rotating magnetic heads arranged adjacent to each other and having different azimuth angles, the head reproduction signal having a large signal level is selectively integrated. In a VTR equipped with a device for detecting tracking error information in a VTR output from a circuit and used as a head reproduction signal, means for detecting the head reproduction signal output from the integrated circuit to obtain a detection reproduction signal, and one vertical scanning For each section obtained by dividing the period into N (N is a natural number of 1 or more), the above-mentioned detected reproduction signal is obtained. A means for generating a level signal corresponding to the signal level, a peak hold circuit for holding the level signal over the length of each section, and a head having a large signal level among the head reproduction signals from the two rotary magnetic heads. Means for permitting the generation of the level signal during the period when one of the rotary magnetic heads, which is predetermined by the head selection signal used for selecting the reproduction signal, is selected; A means for stopping the level signal generating operation described above while the rotary magnetic head other than the predetermined one rotary magnetic head is selected by the signal, and a change in the running speed of the magnetic tape. Means for changing the inclination angle of the central axis of the drum, and the value of the level signal described above after the inclination angle of the central axis of the drum is changed. So as to have a predetermined relative relationship, the means for changing the inclination angle of the central axis of the drum to an appropriate state, and the drum after the inclination angle of the central axis of the drum is made to an appropriate state. A VTR having means for performing tracking adjustment by controlling the rotation phase of the capstan motor with respect to the motor rotation reference signal, and detecting a head reproduction signal output from the integrated circuit in the VTR. And a level signal corresponding to the above-mentioned signal level of the detected reproduction signal is generated for each section obtained by dividing one vertical scanning period into N (where N is a natural number of 1 or more). Means, a peak hold circuit for holding the level signal over the length of each section, and a signal level of the head reproduction signals from the two rotary magnetic heads. A head selection signal used for selecting a large head reproduction signal, means for permitting the generation of the level signal during a period in which one of the predetermined rotary magnetic heads is selected, Means for stopping the above-mentioned level signal generating operation during a period in which the rotary magnetic head other than the one predetermined rotary magnetic head is selected by the head selection signal, and the change of the running speed of the magnetic tape. Correspondingly, the means for changing the inclination angle of the central axis of the drum and the value of the level signal after the inclination angle of the central axis of the drum are changed have a predetermined relative relationship. Means for changing the inclination angle of the central axis of the drum to an appropriate state, and after the inclination angle of the central axis of the drum is set to an appropriate state, the rotation reference signal of the drum motor is compared. Means for performing tracking adjustment by controlling the rotation phase of the capstan motor, and the operation of changing the inclination angle of the central axis of the drum by the means for changing the inclination angle of the central axis of the drum and the rotation reference of the drum motor. (EN) A VTR having means for enabling a tracking adjustment operation by controlling a rotation phase of a capstan motor for a signal to be sequentially and alternately performed.

[0013]

When the magnetic tape wound around a part of the peripheral surface of the drum is reproduced at a running speed different from the running speed of the magnetic tape during the recording operation, the reproducing operation is performed. Then, the inclination angle of the central axis of the drum is set so that the surface of the rotational locus of the rotary magnetic head coincides with the recording trace. The reproducing operation of the recorded information from the recording marks formed on the magnetic tape is performed by two rotary magnetic heads which are arranged adjacent to each other and have different azimuth angles. The head reproduction signal in the form of a modulated wave signal reproduced individually from the above two magnetic heads is
It is supplied to a circuit board integrated into a circuit. On the circuit board, the head reproduction signal having the larger signal level is selected by the head selection signal from the head reproduction signals in the form of modulated wave signals reproduced individually from the two rotary magnetic heads. It is selected by the operation and output from the integrated circuit.

Of the head reproduction signals output from the integrated circuit, that is, the head reproduction signal in the form of the modulated wave signal reproduced individually from the two rotary magnetic heads, the head reproduction having the larger signal level is reproduced. A head reproduction signal in a modulated wave signal form in which signals are sequentially selected and arranged in series on the time axis is detected by an amplitude detector and then supplied to a peak hold circuit via a sampler, or It is supplied to the peak hold circuit via the integrator. When the output signal from the amplitude detector is supplied to the sampler, the sampler performs a sampling operation by the signal RST to generate a level signal for each predetermined sampling period. The level signal obtained by the sampling operation is held in the peak hold circuit only during the period when one of the two rotary magnetic heads selected in advance is selected by the head select signal described above. To be able to give to.

The integrator, to which the output signal from the amplitude detector is supplied, selects the head reproduction signal having a large signal level from the head reproduction signals from the two rotary magnetic heads. The head select signal used allows the integration operation of the detection reproduction signal in the integrator during the period when one of the rotary magnetic heads selected in advance is selected. , The operation is performed so that the integrating operation of the detection reproduction signal in the integrator is stopped during the period when the rotary magnetic head other than the predetermined one rotary magnetic head is selected, and the integrator output The level signal obtained as is given to the peak hold circuit. The peak hold circuit and the integrator are reset by the signal RST.

The signal RST is generated for each section obtained by dividing one vertical scanning period into N (where N is a natural number of 1 or more). When the above N is set to 2 or more, detection reproduction obtained by amplitude detection of the head reproduction signal (reproduction frequency modulated wave signal) in the form of the modulated wave signal reproduced from the magnetic tape by the rotary magnetic head The tilt angle of the central axis of the drum is changed under the control of the control unit so that the magnitudes of the respective level signals obtained on the basis of the signals become equal. After the inclination angle of the central axis of the drum is set to an appropriate state, tracking adjustment is performed by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor under the control of the controller (in this case, N
May have the value 1). The recording mark formed on the magnetic tape is sequentially changed by alternately performing the operation of changing the inclination angle of the central axis of the drum and the tracking adjustment operation by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor. It is possible to achieve a noiseless reproduction state at the time of high-speed reproduction by setting the rotation locus surface of the rotary magnetic head to coincide with the rotation locus surface.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, referring to the accompanying drawings, a preferred one of the reproduced signals from two magnetic heads adjacent to each other and having different azimuth angles according to the present invention is selectively used. The specific contents of the tracking error information detecting device in the VTR and the VTR having the tracking error information detecting device will be described in detail. 1 and 2 are tracking errors in a VTR in which a good signal among the reproduced signals from two magnetic heads adjacent to each other and having different azimuth angles according to the present invention is selectively used. A block diagram showing a schematic configuration of a component part of a VTR including an information detection device, FIGS. 3 to 5 are block diagrams showing a part of a configuration mode of the device of the present invention, FIGS. 6 to 9
10 is a waveform diagram for explaining the operation, FIG. 10 is a cross-sectional view and a perspective view of a part of the mechanism of the VTR, FIG. 11 is a diagram for explaining a state of inclination of the drum, and FIGS. FIG. 6 is a plan view for explaining a relationship between a recording trace and a rotation locus of a rotary magnetic head.

A tracking error information detecting device in a VTR which selectively uses a good signal among the reproduced signals from two magnetic heads adjacent to each other and having different azimuth angles. , And before entering the description of the VTR equipped with the tracking error information detecting device, a recording / reproducing operation is performed on a magnetic tape wound around a part of the peripheral surface of a drum by using a rotary magnetic head. VT
In R, when the reproducing operation is performed in a state where the magnetic tape is traveling at a traveling speed different from the traveling speed of the magnetic tape during the recording operation, the rotational trajectory surface of the rotary magnetic head during the reproduction is formed on the magnetic tape. As an example of a mechanism that embodies one of the above-mentioned plurality of solving means that can be applied when realizing a reproduction state in a noiseless state in conformity with a recorded trace, a magnetic tape sliding contact is used. The center axis of the drum provided with the surface and the passage of the magnetic tape are inclined so that the recording trace formed on the magnetic tape and the rotation locus surface of the rotary magnetic head are aligned. A configuration example will be described with reference to FIG.

In FIG. 10A, DB is a drum base, DA is a drum structure DA composed of an upper drum Du, a lower drum Dd, and a lead ring Lr, and the upper drum constituting the above-mentioned drum structure DA. Du and lower drum Dd
And the lead ring Lr are concentrically configured with respect to the central axis of the drum structure. In FIG. 10A, in order to facilitate understanding of the structure, the drum motor, the central axis of the drum structure, and 90 degrees −2 of the drum structure DA, which will be described later, are used.
Illustration of the tilt fulcrum and the like provided in the direction of 70 degrees (the radial direction of the upper drum Du in the plane including the center line in FIG. 10 and perpendicular to the paper surface) is omitted. In the case of the drum structure DA in which the upper drum Du is fixed to the rotation shaft of the drum motor, the rotation shaft of the drum motor is the central axis of the drum structure DA (upper drum Du, lower drum Dd, The center axis of the lead ring Lr) and the upper drum DA is fixed to the rotor of the drum motor,
In the case of the drum structure DA in which the upper drum Du is rotatably supported by the bearing provided on the shaft fixed to the central position of the stator of the drum motor, the stator of the drum motor described above is used. The axis fixed to the center position of the drum is the central axis of the drum structure DA (the central axis of the upper drum Du, the lower drum Dd, the lead ring Lr, etc.).
Becomes Now, as shown in FIG.
Hb is a rotary magnetic head portion provided at positions 180 degrees symmetrical to each other in the outer peripheral direction of the upper drum Du, and the rotary magnetic head portions Ha and Hb are two with different azimuth angles. The rotary magnetic heads are arranged adjacent to each other (double azimuth head). When a drum motor (not shown) rotates at a predetermined rotation speed, the upper drum Du rotated by the drum motor rotates the rotary magnetic heads Ha and Hb fixed to the upper drum Du at a predetermined rotation speed. Let

Upper drum D shown in FIG. 10 (a)
The lower drum Dd, which is provided concentrically with u and in a non-rotating state, refers to the lower surface 38 of the lower drum Dd.
First inclination degree changing screw 3 with which the tip portion 39a is in contact
According to the forward / backward movement of 9, the drum structure DA 90
Degree-270 degree rotation about the tilt fulcrum provided in the direction {the radial direction of the upper drum Du in the plane including the center line in FIG. 10 and perpendicular to the paper}, In the mode, the tilted state is changed in response to the change of the tilted state of the central axis of the drum. Gears 40 and 43 are fixed to the above-described first inclination changing screw 39. The gear 40 is a motor 11 via a gear 41 and a rotary shaft 42.
(The rotating shaft 42 is rotated while being decelerated by the decelerator). In addition, the gear 43
Is the gear 4 fixed to the second inclination changing screw 45.
It is meshed with 4. The above-described first inclination change screw 39 and the second inclination change screw 45 are
It is meshed with a screw hole provided in the drum base DB fixed to the fixed portion of the VTR.

The tip portion 45a of the above-described second inclination changing screw 45 is in contact with the lower surface 53 of the lead ring Lr. A gear 47 is meshed with a gear 46 provided on the second inclination changing screw 45, and the gear 47 is a rotating shaft 48 of the reference position detector PS.
It is stuck to. The amount of change Δθ1 in the inclination angle of the drum caused by the advancing / retreating of the first inclination degree changing screw 39 with respect to the unit rotation amount of the motor 11 and the first amount of rotation with respect to the unit rotation amount of the motor 11 described above. 2 inclination change screw 4
Amount of change in the inclination angle of the drum caused by the advance / retreat of 5 Δθ2
And .DELTA..theta.1.apprxeq.2.DELTA..theta.2 (change directions are the same). As shown in the drawing, when the connection between the first inclination changing screw 39 and the second inclination changing screw 45 is performed by the gear 43 and the gear 44,
A right screw is used as one of the two screws for changing the inclination of the first inclination changing screw 39 and the second inclination changing screw 45, and a left screw is used as the other. To use. Motor 1 shown in FIG. 10 (a)
1, the rotary encoder RE, the reference position detector PS, etc. correspond to the motor 11, the rotary encoder RE, the reference position detector PS, etc. shown in FIGS. 1 and 2.

The outer peripheral upper edge portion 54 of the lead ring Lr serves as a guide surface of the base edge of the magnetic tape. Further, by fitting the inner peripheral end portion 55 of the lead ring Lr to the outer periphery of the downward protruding portion 56 of the fixed drum Dd, the lead ring Lr and the upper drum Du and the lower drum Dd are concentrically coupled. To do so. The driving force from the motor 11 drives the rotary encoder RE and
When the driving force from the motor drives the gear 41 fixed to the rotary shaft 42, the driving force of the motor 11 is the gear 41 → the gear 40 → the first inclination degree changing screw 39 and the gear 43 → the gear 44 → the second. 2, the inclination change screw 45 and the gear 46 → the gear 47 → the transmission to the rotary shaft 48 of the reference position detector PS, the rotary encoder RE, the reference position detector PS, etc. are shown in FIGS. It is driven by the rotational force of the motor 11 as shown in (a) of FIG.

The above-described first inclination degree changing screw 39 is
By moving back and forth in the screw holes provided in the drum base DB, the lower drum Dd and the upper drum Du move in the direction of 90 degrees to 270 degrees of the drum structure DA (perpendicular to the paper surface including the center line in FIG. 10). The center axis of the lower drum Dd and the upper drum Du (the central axis of the rotation axis) is set to the original center with the tilted fulcrum provided in the upper surface of the upper drum Du in the horizontal plane as the center of rotation. The drum structure DA is inclined in the direction of 0 ° to 180 ° (the horizontal direction of the paper surface in FIG. 10A and FIG. 11) with respect to the central axis. In addition, the above-mentioned second screw 45 for changing the inclination is the drum base DB.
By moving back and forth in the screw hole provided in the lead ring Lr, the center axis of the lead ring Lr (the center axis of the rotating shaft) is moved to the original center axis with the tilt fulcrum described above as the center of rotation. With respect to the direction of 0 ° -180 ° of the drum structure DA {left and right direction of the paper surface in FIG. 10A and FIG. 11}
Will be inclined at.

For example, if the VTR has a fast-forward playback mode (F
When the VTR is operating in the normal reproduction mode as in the example in which the upper drum Du indicates the position by the dotted line in FIG. 11 and is displayed as a small angle when operating in F). Upper drum D shown in solid line in FIG.
It is in a state of being inclined downward to the right with respect to the position of u. Also, if the VTR is, for example, rewinding reproduction mode (FB)
11 in the case where the VTR is operating in the normal reproduction mode, as in the example in which the upper drum Du indicates the position by the broken line in FIG. 11 and is displayed as a large angle. The upper drum Du shown by the solid line in FIG.
It will be in a state of inclining to the left with respect to the position of.

FIG. 10B shows a position sensor PS {FIG. 1,
2 and FIG. 10 (a), the position sensor PS shown in FIG. It is possible to use the photo interrupter 50 having such a configuration that the arc-shaped light shielding plate 49 can move in the optical path between the light emitting element 51 and the light receiving element 52 that are arranged. The arc-shaped light shield plate 49 is fixed to the rotary shaft 48 to which the gear 47 described above is fixed. The reference position of the center axis of the drum and the reference position of the center axis of the lead ring Lr are
The light shielding plate 49 provided on the rotary shaft 48 of the position sensor PS is disengaged from the optical path between the light emitting element 51 and the light receiving element 52, which are opposed to each other, and the light emitting element 51 is removed.
Is the position of the light shielding plate 49 at the moment when the light is received by the light receiving element 52.

Therefore, the size and direction of inclination of the central axis of the drum, and the size and direction of inclination of the central axis of the lead ring Lr are determined from the reference position of the central axis of the drum described above. It can be known by knowing the amount of rotation of 49. The amount of rotation of the arc-shaped light shielding plate 49 described above can be known by the number of output pulses of the rotary encoder RE provided in the motor 11.
Therefore, the magnitude of the inclination angle of the central axis of the drum and the direction of the inclination, and the magnitude of the inclination angle of the central axis of the lead ring Lr and the direction of the inclination are the same as the central axis of the drum and the central axis of the lead ring Lr. When in the reference position, the rotary encoder RE described above is controlled by a counter preset to a predetermined numerical value by the output signal of the photo interrupter 50 used as the position sensor PS.
It can be detected by counting the number of rotation pulses output from the.

A tracking error information detecting device in a VTR according to the present invention for selectively using a good signal among the reproduced signals from two magnetic heads arranged adjacent to each other and having different azimuth angles. 1 and 2 which are block diagrams showing a schematic configuration of a component part of a VTR including the following, 1 is an input terminal for a reproduction signal (reproduction FM signal), 2 is an input terminal for a head selection signal HDSW, and 3 is a drum rotation reference An input terminal for the signal DFF, 4 is an input terminal for the mode signal MOD, and 5 is an input terminal for the control pulse CTLP. The reproduced FM signal (refer to the signal PBFM in FIG. 6 to FIG. 9B) supplied to the input terminal 1 is individually output from two rotary magnetic heads that are adjacently arranged and have different azimuth angles. Among the reproduced head reproduced signals in the form of the modulated wave signal, the head reproduced signal having the larger signal level is detected by the amplitude detector 6, and the amplitude detector 6 outputs the detected signal (c) of FIGS. The envelope signal Sa of the reproduced FM signal PBFM as exemplified by Sa is output. The envelope signal Sa of the reproduced FM signal PBFM output from the amplitude detector 6 as described above is
In the block diagram shown in FIG. 1, it is supplied to the sampler 7s,
In the block diagram shown in FIG. 2, it is supplied to the integrator 7i.

First, as shown in the block diagram of FIG. 1, the envelope signal Sa of the reproduced FM signal PBFM output from the amplitude detector 6 is supplied to the sampler 7s. , Reset signal RST generated by timing signal generator 13
Using {(d) of FIG. 6 and (d) of FIG. 7} as a sampling pulse (sampling signal), sampling is performed from the envelope signal Sa. In the sampler 7s, the sample Sb (see (e) of FIG. 6 and (f) of FIG. 6) extracted from the envelope signal Sa at the time of the reset signal RST is at the time of the reset signal RST described above. The peak hold circuit 7p performing the peak hold operation performs peak hold, and the peak hold circuit 7p supplies a signal Sc as shown in (f) of FIG. 6 and (g) of FIG. 7 to the analog-digital converter 8. It

The specific example illustrated in FIG. 6 (the same applies to FIG. 8, which will be described later with respect to the block diagram of FIG. 2), shows the recording marks formed on the magnetic tape and the rotary magnetic head during the reproducing operation. The relationship with the movement trajectory is shown in FIG.
(A), that is, in a state where the switching of the rotary magnetic head by the head selection signal HDSW is not performed during the reproducing operation, the rotary magnetic head crosses one recording mark and outputs the reproduced signal. This is for the reproduction signal in the state where it is occurring. Further, the specific example illustrated in FIG. 7 (the same applies to FIG. 9, which will be described later with respect to the block diagram of FIG. 2) is the recording trace formed on the magnetic tape and the movement trajectory of the rotary magnetic head during the reproducing operation. 7A and FIG. 9A, that is, in the state where the rotary magnetic head crosses a plurality of recording marks at the time of reproduction to generate a reproduction signal. This is an example of the case, and relates to a reproduction signal in a state where the rotary magnetic head is switched by the head selection signal HDSW.

In FIG. 5A showing a concrete configuration example of the sampler 7s shown in the block diagram of FIG. 1, SWa is the high level of the reset signal RST supplied as a sampling pulse. It is a switch that is turned on during the period, and SWb is a selection signal H.
It is a switch that is turned off during the high level period of DSW. Therefore, when the reproduction FM signal PBFM as shown in FIG. 6B is input to the input terminal 1 in FIG. 1, the reproduction FM signal PBFM is detected by the amplitude detector 6 and the amplitude detector 6 The envelope signal Sa of the reproduced FM signal PBFM illustrated in FIG.
However, the sequential sampling signal Sb shown in FIG. 6 (e) sampled at each time of each reset signal RST in the sampler 7s is switched by the head selection signal HDSW. In the case of FIG. 6 for explaining the example of the state where the switch SWb is not turned on, since the switch SWb is held in the on state, all of the successive sampled values are supplied to the peak hold circuit 7p.

Therefore, when the reproduced FM signal PBFM as shown in FIG. 6B is input to the input terminal 1 in FIG. 1, the peak hold circuit 7p holds the successive sampled values. , The signal Sc supplied from the peak hold circuit 7p to the analog-digital converter 8, that is, the head reproduction signal reproduced separately from two rotary magnetic heads which are adjacently arranged and have different azimuth angles. The signal Sc obtained in correspondence with the head reproduction signal from one of the predetermined rotary magnetic heads is as shown in FIG. 6 (f). Next, FIG.
Even when the reproduced FM signal PBFM as shown in FIG. 7B is input to the input terminal 1 in the middle, the reproduced FM signal PBFM is detected by the amplitude detector 6 and output from the amplitude detector 6. The reproduced FM signal P illustrated in FIG.
For the envelope signal Sa of BFM, sampler 7
At s, sampling is performed at each time point of each reset signal RST.

However, in the example of FIG.
As shown in (e) of FIG.
Since the rotary magnetic head is switched by W, the sample value signal Sb supplied from the sampler 7s to the peak hold circuit 7p is the head selection signal H described above.
The sampled signal Sb obtained by the DSW corresponding to the reproduction signal from one of the two rotary magnetic heads which are adjacently arranged and have different azimuth angles and which is predetermined. Only the peak hold circuit 7p is supplied to the peak hold circuit 7p via the switch SWb. Therefore, in the above case, the peak hold circuit 7p holds the sampled value and the signal Sc supplied from the peak hold circuit 7p to the analog-digital converter 8, that is, the signal Sc arranged adjacently and having different azimuth angles 2 Of the head reproduction signals reproduced individually from the individual rotary magnetic heads, the signal Sc obtained in correspondence with the reproduction signal from one of the predetermined rotary magnetic heads is illustrated in FIG. 7 (g). It becomes something like.

Next, as shown in the block diagram of FIG. 2, when the envelope signal Sa of the reproduced FM signal PBFM output from the amplitude detector 6 is supplied to the integrator 7i, the magnetic tape is used. The record marks formed on the top,
The relationship with the moving track of the rotary magnetic head during the reproducing operation is as shown in FIG.
At the time of the reproducing operation, the rotary magnetic head is not switched by the head selection signal HDSW, and the rotary magnetic head is generating a reproduction signal across one recording mark, and the recording mark formed on the magnetic tape. The relationship with the moving track of the rotary magnetic head during the reproducing operation is as shown in FIG. 9A, that is, the rotary magnetic head generates a reproduction signal across a plurality of recording tracks during reproduction. The signal Sci supplied from the integrator 7i to the analog-digital converter 8 through the peak hold circuit 7p when the rotary magnetic head is switched by the head selection signal HDSW will be described.

In FIG. 5B showing a concrete configuration example of the integrator 7i shown in FIG. 2, V / I is a voltage-current converter, and SWc is a selection signal HDSW whose high level is high level. A switch that is turned off during a period, a switch SWd that is turned on during a period when the reset signal RST is at a high level, and a capacitor C, which is an integrator 7i.
Of the current output from the voltage-current converter V / I,
An operation is performed such that the current during the period when the switch SWc is on is accumulated in the capacitor C, and the accumulated charge (integral value) of the capacitor C is reset by the switch SWd that is turned on by the reset signal RST. Therefore, the integrator 7i uses the head selection signal HDSW, which is used to select a head reproduction signal having a large signal level from the head reproduction signals from the two rotary magnetic heads, and determines one of the predetermined rotation magnetic fields. During the period when the head is selected, the integration operation of the detection reproduction signal is allowed, while the head selection signal HDSW causes
During the period in which the rotary magnetic head other than the predetermined one rotary magnetic head is selected, the integrating operation of the detection reproduction signal in the integrator 7i is stopped, and the reset signal RST (signal RST) The level signal obtained as the integrated value (integral value signal) is reset by the operation. The level signal output from the integrator 7i is given to the peak hold circuit 7p.

First, the operation of the integrator 7i when the rotary magnetic head is not switched by the head selection signal HDSW will be described with reference to FIG. That is, for the input terminal 1 in FIG. 2, the reproduced FM signal PBFM as shown in FIG.
Is input, the reproduced FM signal PBFM is detected by the amplitude detector 6. FIG. 8 output from the amplitude detector 6
The envelope signal Sa of the reproduction FM signal PBFM exemplified in (c) of (3) is supplied to the integrator 7i to charge the capacitor C, and the accumulated charge (integrated value of the envelope signal Sa described above) of the capacitor C becomes , Play FM signal P
It is an integrated value of the envelope signal Sa of BFM. The charge accumulated in the capacitor C (integrated value of the envelope signal Sa) is turned on for each reset signal RST shown in (d) of FIG.
While being reset by Wd, the peak hold circuit 7p is supplied with a signal Sbi having a sequential integrated value shown in (e) of FIG. 8 in which the envelope signal Sa is integrated for each section between the reset signals RST. To be done.

As described above, when the reproduced FM signal PBFM as shown in FIG. 8B is input to the input terminal 1 in FIG. 2, the peak hold circuit 7p integrates the signals for each successive section. The signal Sbi of the value is held, and the signal Sci supplied from the peak hold circuit 7p to the analog-digital converter 8, that is, the two rotating magnetic heads which are arranged adjacent to each other and have different azimuth angles are individually provided. Among the reproduced head reproduced signals, the signal Sci obtained in correspondence with the head reproduced signal from one of the rotary magnetic heads, which is predetermined, is as shown in FIG. 8 (f). Become.

Next, the operation of the integrator 7i when the rotary magnetic head is switched by the head selection signal HDSW will be described with reference to FIG. That is, for the input terminal 1 in FIG. 2, the reproduced FM signal PBFM as shown in FIG.
Is input, the reproduced FM signal PBFM is detected by the amplitude detector 6. FIG. 9 output from the amplitude detector 6
The envelope signal Sa of the reproduction FM signal PBFM exemplified in (c) of (3) is supplied to the integrator 7i to charge the capacitor C, and the accumulated charge (integrated value of the envelope signal Sa described above) of the capacitor C becomes , Play FM signal P
It is an integrated value of the envelope signal Sa of BFM. The charge accumulated in the capacitor C (the integrated value of the envelope signal Sa) is turned on by the switch S for each reset signal RST shown in FIG. 9D.
While being reset by Wd, the integrator 7i performs the integration operation only while the head selection signal HDSW shown in (e) of FIG. 9 is at the low level, and the head selection signal HDSW is at the high level period. Is held in the integrated value immediately before the head selection signal HDSW changes from the low level period to the high level period until the next reset signal, which is illustrated in FIG. 9 (f). It operates like this.

As described above, when the reproduced FM signal PBFM as shown in FIG. 9B is input to the input terminal 1 in FIG. 2, the sequential integration held in the peak hold circuit 7p is performed. Of the peak value signal Sci of the value signal Sbi, that is, one of the predetermined ones of the head reproduction signals reproduced individually from the two rotary magnetic heads arranged adjacent to each other and having different azimuth angles. The signal Sci obtained in correspondence with the head reproduction signal from the rotary magnetic head is shown in FIG.
(G), and this signal Sci is supplied from the peak hold circuit 7p to the analog-digital converter 8.

The reset signal RST (signal RS
T) can be sampled from a predetermined portion in the envelope signal Sa corresponding to the reproduced FM signal reproduced in one vertical scanning period based on the drum rotation reference signal DFF supplied via the input terminal 3. It is generated by the timing signal generator 13 at such a time position. That is, the signal RST is generated for each section obtained by dividing one vertical scanning period into N (where N is a natural number of 1 or more). However, when N is set to 2 or more, Each of the sequential level signals obtained based on the detected reproduction signal obtained by amplitude detection of the head reproduction signal (reproduction frequency modulated wave signal) in the form of the modulated wave signal reproduced from the magnetic tape by the rotary magnetic head is This can be used when changing the inclination angle of the central axis of the drum or the inclination angle of the central axis of the lead ring Lr under the control of the control unit so that the magnitudes of the respective successive level signals become equal.

By changing the tilt angle of the central axis of the drum and the tilt angle of the central axis of the lead ring Lr under the control of the control unit so that the magnitudes of the above-mentioned respective level signals become equal. After the inclination angle of the central axis of the drum and the inclination angle of the central axis of the lead ring Lr are set to appropriate states, the rotational phase of the capstan motor with respect to the rotational reference signal of the drum motor is controlled under the control of the controller. Tracking adjustment by control is performed (in this case, the value of N may be 1). An operation of changing the inclination angle of the central axis of the drum or the inclination angle of the central axis of the lead ring Lr,
The tracking adjustment operation by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor is sequentially and alternately performed so that the recording trace formed on the magnetic tape and the rotation locus surface of the rotating magnetic head coincide with each other. In this way, the noiseless reproduction can be set in the trick play reproduction.

In the block diagrams of FIGS. 1 and 2, the output signal from the peak hold circuit 7p described above is individually analog-digital converted by the analog-digital converter 8 and then includes a microcomputer unit. It is supplied to the configured control unit 9. A mode signal MOD is also supplied to the control unit 9 via the mode signal input terminal 4. As described above, when the reproducing operation is performed by traveling the magnetic tape at a traveling speed different from the traveling speed of the magnetic tape at the time of recording, the rotation locus of the rotating magnetic head during the reproducing operation and the magnetic tape The recorded traces were recorded, for example, in Figure 1.
In the case where adjacent recording marks are recorded by a rotating magnetic head having magnetic gaps having different azimuth angles due to the deviation as illustrated in FIG.
Only the signal of the portion in which the portion of the frame surrounded by the solid line and the portion of the frame surrounded by the dotted line in the inside overlap is reproduced.

Due to the deviation between the rotation trace of the rotary magnetic head and the recording trace recorded on the magnetic tape when the reproducing operation is performed by traveling the magnetic tape at a traveling speed different from the traveling speed of the magnetic tape during recording. , Play FM
Envelope signal Sa obtained by amplitude detection of signal PBFM
Becomes as illustrated in each of (c) of FIGS. 6 to 9, for example, in the envelope signal of one vertical scanning period, each section in a state where one vertical scanning period is divided into a plurality of sections. The magnitudes of the signals sampled from are not the same, but the magnitudes of the signals sampled from a plurality of sections in one vertical scanning period are the same with respect to the envelope signal Sa obtained by amplitude detection of the reproduced FM signal PBFM. As described above, by changing the inclination angle of the central axis of the drum and the inclination direction, and the inclination angle of the central axis of the lead ring Lr and the inclination direction, the rotation locus of the rotary magnetic head during the reproducing operation can be obtained. , The direction of the recording mark recorded on the magnetic tape can be matched.

By the way, as described above, the magnitude of the tilt angle of the central axis of the drum and the direction of the tilt, and the magnitude of the tilt angle of the central axis of the lead ring Lr and the direction of the tilt are changed, and the rotating magnetic field during the reproducing operation is changed. The direction of the rotation track of the head and the recording marks recorded on the magnetic tape are the same,
Regarding the envelope signal Sa obtained by amplitude-detecting the reproduced FM signal PBFM obtained in that state, it is assumed that the size of the signal sampled from each section in the state where one vertical scanning period is divided into a plurality of sections is the same. In some cases, however, the overlapping state of the two may be a part of the recording trace in the width direction as illustrated in FIG. However, in the case of FIG. 13, if the rotational phase of the capstan motor is phase-shifted and tracking is performed, both of them can be overlapped.

In the VTR of the present invention, the mode signal MOD indicating the running speed of the magnetic tape determined in correspondence with the reproducing operation mode is given to the control section 9 via the input terminal 4 and controlled by the control circuit 10. The data C1 indicating the current inclination angle of the central axis of the drum is given to the section 9, and the control section 9 outputs the signal Sg for rotating the motor 11 in the reverse direction.
Is generated and supplied to the control circuit 10. Further, the control section 9 supplies the motor stop target count value data D1 corresponding to the running speed of the magnetic tape according to the reproducing operation mode to the control circuit 10 and then the motor. A signal St for rotating 11 in the forward direction is supplied to the control circuit 10. As a result, the control circuit 10 drives and controls the motor 11 in a predetermined rotation direction, and stops the motor 11 at the position determined by the motor stop target count value data D1. The motor 1
1 is rotated at a low speed so that the motor can be reliably stopped at the position defined by the stop target count value data D1 of the motor.

By the drive by the above-mentioned motor 11, the inclination angle of the central axis of the drum is set to an angle which is determined to be suitable for the running speed of the magnetic tape which is determined corresponding to the reproducing operation mode. When the difference in the magnitudes of the signals sampled from N points in one vertical scanning period in the envelope signal Sa obtained by amplitude detection of the reproduced FM signal PBFM reproduced by the rotary magnetic head is equal to or more than a predetermined value, That is, when the direction of the rotation locus of the rotary magnetic head during the reproducing operation and the direction of the recording trace recorded on the magnetic tape deviate from a predetermined value, the direction is such that the deviation can be corrected. The motor 11 is driven so that the inclination angle of the central axis of the drum is changed.

In the correction operation described above, the difference in the magnitudes of the signals sampled from a plurality of points in one vertical scanning period in the envelope signal Sa obtained by amplitude-detecting the reproduced FM signal PBFM reproduced by the rotary magnetic head is determined in advance. Repeat until the value falls below the specified value. The reproduced FM signal PBF reproduced by the rotary magnetic head by the correction operation described above.
1 in the envelope signal Sa obtained by amplitude detection of M
If the difference in the magnitude of the signals sampled from a plurality of locations in the vertical scanning period is less than or equal to a predetermined value, if the sampled signal is small, that is,
Even when the direction of the rotation track of the rotary magnetic head during the reproduction operation and the direction of the recording track recorded on the magnetic tape match, the overlapping state of the two may be a part as illustrated in FIG. 13, for example. Then, the rotation phase of the capstan motor is shifted to perform tracking so that the both are superposed. This makes it possible to control the rotation locus of the rotary magnetic head and the recording trace so that they substantially coincide with each other. The mode signal supplied to the control unit 9 through the mode signal input terminal 4 is information for setting the inclination angle of the central axis of the drum, which has already been described, and the operation of the magnetic recording / reproducing apparatus. When the mode is the normal recording mode, the recording / reproducing operation is performed with the inclination angle of the central axis of the drum fixed to the standard inclination.

The two control circuits 14 shown in FIG.
The control circuit 14 of 10 is a control circuit for controlling the rotational phase of the capstan motor 15, and a specific configuration example thereof is illustrated in the block diagram of FIG. The control circuit 14 is supplied with the data D2 indicating the value for shifting the phase of the comparison reference signal from the control section 9 and the input terminal 3
The drum rotation reference signal DFF and the control signal CTLP from the input terminal 5 are also supplied to the control circuit 14. From the control circuit 14 described above to the capstan motor 1
5, a motor drive signal MD2 is supplied, and a signal CAPFG generated by a frequency generator attached to the capstan motor 15 is supplied to the control circuit 14 from the capstan motor 15 side. .

Further, the control circuit 10 in FIG. 1 carries out a drive control operation of the drive motor 11 for changing the inclination angle of the central axis of the drum. In the figure, a block 12 shown adjacent to the motor 11 is a sensor such as a rotary encoder RE provided in the motor 11 and a photo interrupter (see FIG. 10) used as a position sensor PS. Motor 11 performed by control circuit 10
The drive control operation of is performed as follows. The control unit 9 supplies the motor stop target count value data D1 and the signal St for rotating the motor 11 in the forward rotation direction to the control circuit 10, and the control circuit 10 supplies the control unit 9 with the signal St. On the other hand, data C1 indicating the current value of the inclination angle of the central axis of the drum is supplied. In addition, the control circuit 1 described above
From 0 to the motor 11, the motor drive signal MD1
Is supplied to the control circuit 10 from the sensor 12,
Rotation pulse RPL generated by rotary encoder RE
S and the reference position signal STA generated by the position sensor PS
Is supplied.

In the control circuit 10 shown in FIG. 3, 19 is a counter, and in the counter 19, the reference position signal STA generated by the position sensor PS in the sensor 12 is supplied to the preset terminal. At that time, the numerical value set in the numerical register 20 is preset, and the sensor 1
The rotation pulse RPLS generated by the rotary encoder RE in 2 is used as the counted pulse to perform the counting operation, and the count value C1, that is, the current value of the inclination angle of the central axis of the drum is given to the comparator 16 and the control section 9 is also given. Supply. As described above, the signal indicating the signal level of the reproduced FM signal and the envelope signal Sa corresponding to the reproduced FM signal reproduced from each section of N sections obtained by dividing one vertical scanning period into N is converted into the analog-digital converter 8 The control unit 9 to which the analog-to-digital converted data is given by calculates the difference between the data given from the analog-to-digital converter 8, and based on the value of the difference between the data, the center of the drum. The stop target count value data D1 of the motor corresponding to the target value of the shaft inclination angle is determined and given to the control circuit 10.

In the control section 9, the reproduced FM signal reproduced from each one section of the N sections obtained by dividing the above-mentioned one vertical scanning period into N sections and the signal indicating the signal level of the envelope signal Sa corresponding to the reproduced FM signal are sequentially output. The value of the difference between the data is 1
If the difference between the data due to the signal level signal before the section becomes larger than the value of the difference between the data, the direction of the central axis of the drum is reversed in the direction opposite to the direction of the change of the inclination angle of the central axis of the drum performed last time. Motor 1 for changing the inclination angle by a predetermined amount
A signal Sg for rotating 1 in the reverse direction is generated and supplied to the control circuit 10. As described above, the motor 11
When the control unit 9 generates a signal St for rotating the control circuit 10 in the normal direction and the control unit 9 supplies the signal St to the control circuit 10,
The set reset flip-flop 1 of the control circuit 10 is controlled by the signal St for rotating the motor 11 in the normal direction.
7 is set. Further, when a signal Sg for rotating the motor 11 in the reverse direction is generated by the control unit 9 and is given from the control unit 9 to the control circuit 10, the signal Sg described above is given.
This sets the set / reset flip-flop 18 of the control circuit 10.

When the set / reset flip-flop 17 in the control circuit 10 is set, the high level signal output from the Q output terminal of the set / reset flip-flop 17 is switched to the switch SW.
Turn 1 on. When the switch SW1 is turned on, the positive power source 22 is connected to the motor drive circuit 24, so that the motor drive circuit 24 transfers to the motor 11.
A motor drive signal MD1 that causes the motor 11 to rotate normally is supplied. By the normal operation of the motor 11, the first inclination degree changing screw 39 and the second inclination degree changing screw 45 are rotationally driven via gears (predetermined one of 41 to 44), Inclination angle of central axis of drum and lead ring Lr
The tilt angle of the central axis of is changed.

When the set / reset flip-flop 18 in the control circuit 10 is set, a high level signal output from the Q output terminal of the control circuit 10 turns on the switch SW3. When the switch SW3 is turned on, the negative power source 23 is connected to the motor drive circuit 24, so that the motor drive circuit 24 causes the motor 11 to drive the motor 11 in the reverse direction.
1 is supplied. By the reverse operation of the motor 11, the first
Inclination change screw 39 and second inclination change screw 45
Are rotationally driven via gears (predetermined one of 41 to 44), and the inclination angle of the central axis of the drum and the inclination angle of the central axis of the lead ring Lr are changed.

By the forward rotation operation or the reverse rotation operation of the motor 11 as described above, the target position or the inclination angle in the direction in which the inclination angle of the central axis of the drum and the inclination angle of the central axis of the lead ring Lr increase becomes small. The count value C1 of the counter 19 indicating the current value of the inclination angle of the central axis of the drum changes as it changes toward the target position in one direction. Then, the count value C1 of the counter 19 supplied to the comparator 16 and the comparator 16 from the controller 9
When the stop target count value data D1 of the motor supplied to the above is matched, the set reset flip-flop 18 is reset by the match pulse output from the comparator 16 and a high level output signal is output from the NOR circuit 21. When output, it turns SW2 on. When the switch SW2 is turned on, the ground potential is applied to the input side of the motor drive circuit 24, the driving operation of the motor 11 by the motor drive circuit 24 is stopped, and the inclination angle of the central axis of the drum is controlled by the controller. The target position set in 9 will be held. As described above, in the VTR of the present invention, by the control operation by the control unit 9 and the control circuit 10 described above,
The inclination angle of the central axis of the drum is repeatedly changed,
The rotation locus of the rotary magnetic head and the recording trace are controlled so as to substantially coincide with each other.

However, with respect to the envelope signal Sa obtained by amplitude-detecting the reproduced FM signal PBFM as described above, the reproduced FM signal reproduced from each one section of N sections obtained by dividing one vertical scanning period into N sections. By changing the tilt angle of the central axis of the drum and the tilt angle of the central axis of the lead ring Lr so that the sequential data by the signal indicating the signal level of the envelope signal Sa corresponding to The rotation trajectory of the rotating magnetic head,
Even when the directions of the recording marks recorded on the magnetic tape can be matched, the reproduction FM signal PBFM is low in the case where the overlapping state of the two is as illustrated in FIG. 13, for example. It will be reproduced at the signal level. In such a case, the rotational phase of the capstan motor is phase-shifted to perform tracking, whereby the above two are well superposed and a high-level reproduced FM signal PBFM is obtained.

Therefore, in the VTR of the present invention, the signal obtained by dividing the output signal of the capstan frequency generator and the periodic signal related to the vertical synchronizing signal of the input video signal are delayed so that the reproduction output becomes maximum. The rotation phase of the capstan motor is controlled by the signal obtained by phase comparison with the obtained signal. The relationship between the recording trace to be newly recorded and the control pulse is recorded on the magnetic tape at a time point immediately before the start of the recording operation by controlling so as to maintain the state immediately before the start of the recording operation. The above problem is solved by making the relationship between the recorded trace and the control pulse the same, and the control operation is performed by the control unit 9 and the control circuit 14.

FIG. 4 showing a specific example of the configuration of the control circuit 14.
, The drum rotation reference signal DFF, which repeats the high level state and the low level state every one vertical scanning period in synchronization with the input video signal, is supplied to the subtraction counter 27 and the monostable multivibrator 32. The subtraction counter 27 is supplied with the data D2 indicating the value for shifting the phase of the comparison reference signal from the control section 9 and the clock signal from the AND circuit 26. Further, a control signal CTLP is given as a signal to be counted to the programmable frequency divider 30 whose frequency division ratio is changed by the mode signal. The subtraction counter 27 is preset with the data D2 indicating the value for shifting the phase of the comparison reference signal when the drum rotation reference signal DFF is applied to its preset terminal. The numerical value preset in the subtraction counter 27 is subtracted by the clock pulse oscillated by the oscillator 25 being supplied through the AND circuit 26.

When the value of the subtraction counter 27 reaches zero, a high level signal is output from the zero detector 28, which supplies it to the phase comparator 29 and the monostable multivibrator 33. To be done. By supplying the drum rotation reference signal DFF to the preset terminal,
At the time when the subtraction counter 27 is preset, the output signal from the monostable multivibrator 32 triggered by the drum rotation reference signal DFF is supplied to the set terminal to set the flip-flop 31, and the Q value of the flip-flop 31 is set. When the output terminal becomes high level,
The clock pulse oscillated by the oscillator 25 is supplied to the subtraction counter 27 via the AND circuit 26, and the subtraction counter 27 starts counting.

The flip-flop 31 outputs the output signal of the monostable multivibrator 33 triggered by the high level signal output from the zero detector 28 when the value of the subtraction counter 27 becomes zero. It is reset at the time when it is supplied to the reset terminal, whereby the Q output terminal of the flip-flop 31 becomes low level, so that the clock pulse is not supplied from the oscillator 25 to the subtraction counter 27 via the AND circuit 26. That is, the AND circuit 26, to which the gate signal is applied from the flip-flop 31 as described above, outputs zero or more high-level outputs twice or more during one cycle of the drum rotation reference signal DFF. In order to prevent the clock from being output from the device 28, the operation of limiting the input of the clock pulse supplied from the oscillator 25 to the subtraction counter 27 is performed.

The data D2 indicating the value for shifting the phase of the comparison reference signal supplied from the control unit 9 to the control circuit 14 is a high level signal output from the zero detector 28 from the time of the drum rotation reference signal DFF. The rotation phase of the capstan motor, which uses the data D2 indicating the value for shifting the phase of the comparison reference signal as the rotation target phase, is the data D indicating the value for shifting the phase of the comparison reference signal.
It changes with the change of 2. The error signal generated by the phase comparator 29 and the signal CA generated by the frequency generator
The output signal from the subtractor 35, to which the signal obtained by converting the PFG into the voltage by the frequency-voltage converter 34 is applied, is phase-compensated by the phase compensating circuit 36. It is given to the stun motor 15. Then, since the change of the rotation phase of the capstan motor changes the rotation locus of the rotary magnetic head in the width direction of the recording mark, the tracking control can be performed by changing the rotation phase of the capstan motor as described above. You can do it.

[0060]

As is apparent from the above detailed description, the tracking error information detecting device in the VTR of the present invention and the VTR equipped with the tracking error information detecting device described above are provided on one surface of the drum. When performing a reproducing operation with the magnetic tape wound around the magnetic tape running at a running speed different from the running speed of the magnetic tape during the recording operation, the recording marks of the rotary magnetic head The tilt angle of the center axis of the drum is set so that the surfaces of the rotation loci coincide with each other, and the reproducing operation of the recorded information from the recording marks formed on the magnetic tape is performed by changing the azimuth angle of the adjacent recording elements. And the head reproduction signal in the form of a modulated wave signal individually reproduced by the two magnetic heads described above is integrated into a circuit board. The head reproduction signal having the larger signal level among the head reproduction signals in the form of modulated wave signals reproduced individually from the two magnetic heads is supplied to the circuit board by the head selection signal. The head reproduction signal output from the integrated circuit, which is selected by the selection operation performed and output from the integrated circuit,
Of the head reproduction signals in the form of modulated wave signals reproduced individually from the two magnetic heads, the head reproduction signal with the larger signal level is sequentially selected and arranged in series on the time axis. The head reproduction signal in the form of the modulated wave signal is detected by the amplitude detector and then supplied to the peak hold circuit via the sampler, or is supplied to the peak hold circuit via the integrator, and is supplied from the amplitude detector described above. When the output signal is supplied to the sampler, the sampler performs a sampling operation at each predetermined sampling period to generate a level signal, but the sampler uses the head selection signal described above. Of the two rotary magnetic heads, the level obtained by the sampling operation is obtained only during the period when one of the rotary magnetic heads, which is predetermined, is selected. It gives a signal to the peak hold circuit,
On the other hand, the integrator, to which the output signal from the amplitude detector is supplied, is reset by the signal RST, and the head reproduction signal having a large signal level among the head reproduction signals from the two rotary magnetic heads. By the head selection signal used to select one of the rotary magnetic heads, the integration operation of the detection reproduction signal in the integrator is allowed during the period when one of the rotary magnetic heads selected in advance is selected. The head selection signal of 1 operates so that the integration operation of the detection reproduction signal in the integrator is stopped during the period in which the rotary magnetic head other than the predetermined one is selected. The level signal obtained as the integrator output is applied to the peak hold circuit. The signal RST is N for one vertical scanning period.
(Where N is a natural number of 1 or more) is generated for each section obtained by division, and when N is set to 2 or more, the modulated wave reproduced from the magnetic tape by the rotary magnetic head. The tilt angle of the central axis of the drum is set so that the levels of the respective level signals obtained on the basis of the detected reproduction signal obtained by amplitude detection of the head reproduction signal (reproduction frequency modulated wave signal) in the signal form become equal. Or the tilt angle of the center axis of the lead ring is changed under the control of the control unit, and after the tilt angle of the center axis of the drum or the tilt angle of the center axis of the lead ring is adjusted to an appropriate state, the control is performed. The tracking adjustment is performed by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor under the control of the unit. Altering the tilt angle of the central axis of the drum and the tilt angle of the central axis of the lead ring, and the tracking adjustment operation by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor are alternately performed in sequence. The recording trace formed on the magnetic tape and the surface of the rotary locus of the rotary magnetic head are aligned with each other so that noiseless reproduction can be achieved during trick play reproduction. During the reproducing operation of various trick play in which the reproducing operation is performed at the traveling speed of the magnetic tape different from the traveling speed of the magnetic tape during the recording operation, the two rotating magnetic heads that are adjacently arranged and have different azimuth angles are used. Head reproduction signal in the form of a modulated wave signal obtained by reproducing in a state where the rotation trajectory crosses the recording trace on the magnetic tape. In the VTR, a head reproduction signal having a large signal level is selected and used as a reproduction signal to improve a reproduced image during various trick play operations at low cost. In order to further improve the quality of the reproduced image, the inclination of the drum and the path of the reference edge of the magnetic tape are changed in accordance with the running speed of the magnetic tape, and the running direction of the magnetic tape and the rotary magnetic head Rotation direction of the rotary magnetic head is relatively changed by relatively changing the direction of the rotation track surface of the rotary magnetic head, and the rotation of the rotary magnetic head is tried to trace the rotary magnetic head to a recording mark. The amount of deviation between the locus and the recording mark is detected, and the position of the above-mentioned drum inclination and the position of the reference edge path of the magnetic tape are automatically controlled so that the amount of deviation becomes zero. The information about the amount of deviation between the rotational trajectory of the magnetic head and the recording trace, which is required when performing the operation, is two pieces that are arranged adjacent to each other and have different azimuth angles as in a conventional consumer VTR. Among the head reproduction signals in the form of the modulated wave signal reproduced from the rotary magnetic head, the head reproduction signal with a large signal level is selected and output as a reproduction signal. However, the head reproduction signal in the form of a modulated wave signal reproduced from two rotary magnetic heads arranged adjacent to each other and having different azimuth angles could not be individually taken out from the integrated circuit board. The reproduced signal output from the integrated circuit board is reproduced individually from the rotary magnetic head indicating information on the amount of deviation between the rotation track of the rotary magnetic head and the recording trace. Since the head reproduction signal in the form of the modulated wave signal can be taken out, the present invention can satisfactorily solve the above-mentioned conventional problems.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of components of a VTR including a tracking error information detection device in the VTR of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of components of a VTR including a tracking error information detection device in the VTR of the present invention.

FIG. 3 is a block diagram showing a partial configuration mode of the device of the present invention.

FIG. 4 is a block diagram showing a partial configuration of the device of the present invention.

FIG. 5 is a block diagram showing a partial configuration of the device of the present invention.

FIG. 6 is a waveform diagram for explaining the operation.

FIG. 7 is a waveform diagram for explaining the operation.

FIG. 8 is a waveform diagram for explaining the operation.

FIG. 9 is a waveform diagram for explaining the operation.

FIG. 10 is a cross-sectional view and a perspective view of a mechanical portion of a VTR.

FIG. 11 is a diagram for explaining a tilted state of a drum.

FIG. 12 is a plan view for explaining the relationship between the recording trace of the magnetic tape and the rotation trajectory of the rotary magnetic head.

FIG. 13 is a plan view for explaining the relationship between the recording trace of the magnetic tape and the rotation locus of the rotary magnetic head.

[Explanation of symbols]

DB ... Drum base, DA ... Upper drum Du and lower drum D
Drum structure consisting of d and lead ring Lr, Ha, H
b ... Revolving magnetic head portions provided at 180-degree symmetrical positions in the outer circumferential direction of the upper drum Du, RE ... Rotary encoder, PS ... Reference position detector, SWa-SWd ...
Switch, V / I ... voltage-current converter, C ... capacitor,
Reference numeral 1 ... Playback signal (playback FM signal) input terminal, 2 ... Head selection signal HDSW input terminal, 3 ... Drum rotation reference signal DFF input terminal, 4 ... Mode signal MOD input terminal,
5 ... Input terminal of control pulse CTLP, 6 ... Amplitude detector, 7s ... Sampler, 7i ... Integrator, 7p ... Peak hold circuit, 8 ... Analog-digital converter, 9 ... Control unit, 10, 14 ... Control circuit, 11 ... motor, 12 ... sensor, 13 ... timing signal generator, 15 ... capstan motor, 16 ... comparator, 17,18 ... set / reset flip-flop, 19 ... counter, 20 ... register, 21
... NOR circuit, 22 ... Positive power supply, 23 ... Negative power supply, 24 ... Motor drive circuit, 25 ... Oscillator, 26 ... AND circuit, 27 ...
Subtraction counter, 28 ... Zero detector, 29 ... Phase comparator, 3
DESCRIPTION OF SYMBOLS 1 ... Flip-flop, 32, 33 ... Monostable multivibrator, 38 ... Lower surface of lower drum Dd 39 ... 1st inclination change screw, 40, 41, 43, 44 ... Gear, 49
... Arc-shaped shading plate, 50 ... Photo interrupter, 51 ...
Light emitting element, 52 ... light receiving element, 53 ... lower surface of lead ring Lr,

Claims (4)

[Claims] 1. A recording / reproducing operation is performed on a magnetic tape wound around a part of a peripheral surface of a drum by using a rotary magnetic head, and a running speed of the magnetic tape during the recording operation. When a reproducing operation is performed while the magnetic tape is traveling at a traveling speed different from the above, the operation of the component functioning to match the rotational locus surface of the rotary magnetic head with the recording trace formed on the magnetic tape. under,
Of the head reproduction signals in the form of modulated wave signals reproduced by two rotary magnetic heads arranged adjacent to each other and having different azimuth angles, a head reproduction signal having a large signal level is selectively output from the integrated circuit. A device for detecting tracking error information in a VTR which is used as a head reproduction signal and has means for detecting a head reproduction signal output from an integrated circuit to obtain a detection reproduction signal and N (where N is a vertical scanning period). Means for generating a level signal corresponding to the signal level of the detected reproduced signal, and a peak hold for holding the level signal for each section length. The circuit and the head reproduction signal from the two rotary magnetic heads are used to select a head reproduction signal having a large signal level. Means for allowing the generation of the level signal during the period when one of the rotary magnetic heads is selected by the selection signal, and one rotary magnetic head that is predetermined by the head selection signal. The tracking error information detecting device in the VTR, which comprises means for stopping the level signal generating operation during the period when the other rotary magnetic head is selected. 2. A recording / reproducing operation is performed on a magnetic tape wound on a part of a peripheral surface of a drum by using a rotary magnetic head, and a running speed of the magnetic tape during the recording operation. When a reproducing operation is performed while the magnetic tape is traveling at a traveling speed different from the above, the operation of the component functioning to match the rotational locus surface of the rotary magnetic head with the recording trace formed on the magnetic tape. under,
Of the head reproduction signals in the form of modulated wave signals reproduced by two rotary magnetic heads arranged adjacent to each other and having different azimuth angles, a head reproduction signal having a large signal level is selectively output from the integrated circuit. A device for detecting tracking error information in a VTR, which is used as a head reproduction signal, including means for detecting a head reproduction signal output from an integrated circuit to obtain a detection reproduction signal, and an integrating operation for the detection reproduction signal. One of the rotary magnetic heads predetermined by the integrator to be performed and the head selection signal used to select the head reproduction signal having a large signal level from the head reproduction signals from the two rotary magnetic heads. A means for allowing the integrating operation of the detection reproduction signal in the integrator during the selected period, and the head selection signal By means of means for stopping the integrating operation of the detection reproduction signal in the integrator during the period when the rotary magnetic head other than the predetermined one rotary magnetic head is selected, and one vertical scanning period is N (Where N is a natural number of 2 or more) A means for holding the integrated value of the detection reproduction signal at that time point by the peak hold circuit and resetting the integrated value of the integrator at each end point of each section obtained by division. A device for detecting tracking error information in a VTR, comprising: 3. A recording / reproducing operation is performed on a magnetic tape wound around a part of a peripheral surface of a drum by using a rotary magnetic head, and a running speed of the magnetic tape during the recording operation. When a reproducing operation is performed while the magnetic tape is traveling at a traveling speed different from that of the recording tape formed on the magnetic tape and the rotary magnetic head, the central axis of the drum having the sliding contact surface of the magnetic tape is Modulated wave signal form reproduced by two rotary magnetic heads which are adjacently arranged and have different azimuth angles under the operation of the tilt drive means for tilting so as to match the rotation locus plane. Of the head reproduction signals, a head reproduction signal having a large signal level is selectively output from the integrated circuit and is used as a head reproduction signal. A VTR provided, means for detecting a head reproduction signal output from the integrated circuit to obtain a detection reproduction signal, and one obtained by dividing one vertical scanning period into N (where N is a natural number of 1 or more) Means for generating a level signal corresponding to the signal level of the detected reproduction signal for each section, a peak hold circuit for holding the level signal for each section length, and a head from two rotary magnetic heads The above-mentioned level signal is generated during a period in which one of the rotary magnetic heads, which is predetermined, is selected by the head selection signal used for selecting the head reproduction signal having a large signal level among the reproduction signals. And the head selection signal described above is used during the period in which the rotary magnetic head other than the one predetermined rotary magnetic head is selected. Means for stopping the operation of generating the level signal, means for changing the inclination angle of the central axis of the drum in response to the change in the running speed of the magnetic tape, and the means after the inclination angle of the central axis of the drum is changed. Means for changing the inclination angle of the central axis of the drum into an appropriate state so that the value of the level signal has a predetermined relative relationship, and the inclination angle of the central axis of the drum is in an appropriate state. And a means for enabling tracking adjustment by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor. 4. A recording / reproducing operation is performed on a magnetic tape wound around a part of a peripheral surface of a drum by using a rotary magnetic head, and a running speed of the magnetic tape during the recording operation. When a reproducing operation is performed while the magnetic tape is traveling at a traveling speed different from that of the recording tape formed on the magnetic tape and the rotary magnetic head, the central axis of the drum having the sliding contact surface of the magnetic tape is Modulated wave signal form reproduced by two rotary magnetic heads which are adjacently arranged and have different azimuth angles under the operation of the tilt drive means for tilting so as to be in a state of being coincident with the plane of the rotation locus. Of the head reproduction signals, a head reproduction signal having a large signal level is selectively output from the integrated circuit and is used as a head reproduction signal. A VTR provided, means for detecting a head reproduction signal output from the integrated circuit to obtain a detection reproduction signal, and one obtained by dividing one vertical scanning period into N (where N is a natural number of 1 or more) Means for generating a level signal corresponding to the signal level of the detected reproduction signal for each section, a peak hold circuit for holding the level signal for each section length, and a head from two rotary magnetic heads The above-mentioned level signal is generated during a period in which one of the rotary magnetic heads, which is predetermined, is selected by the head selection signal used for selecting the head reproduction signal having a large signal level among the reproduction signals. And the head selection signal described above is used during the period in which the rotary magnetic head other than the one predetermined rotary magnetic head is selected. Means for stopping the operation of generating the level signal, means for changing the inclination angle of the central axis of the drum in response to the change in the running speed of the magnetic tape, and the means after the inclination angle of the central axis of the drum is changed. Means for changing the inclination angle of the central axis of the drum into an appropriate state so that the value of the level signal has a predetermined relative relationship, and the inclination angle of the central axis of the drum is in an appropriate state. Means for performing tracking adjustment by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor, and the inclination of the central axis of the drum by the means for changing the inclination angle of the central axis of the drum described above. The angle changing operation and the tracking adjustment operation by controlling the rotation phase of the capstan motor with respect to the rotation reference signal of the drum motor are sequentially performed alternately. VTR consisting comprise Naruto and means for.