JPS58215721A - Automatic scanner for magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To attain correct scanning independently of the accuracy of read at recording/reproduction, by recording a tracking pilot signal on an auxiliary track intermittently with a multigap head and controlling a magnetic head with its reproducing head. CONSTITUTION:Pilot signals 21, 22 are recorded on the auxiliary track alternately in frequencies f1, f2 intermittently at one field interval with the multigap head. When the pilot signals 21, 22 are detected with a plot signal reproducing head 31 at recording/reproduction and the tracking servo is applied so as to make the detecting level of the pilot signals in the frequencies f1, f2 equal, the head 31 scans the center of the track correctly. Thus, an erasing head 32 and a recording/reproducing head 33 with the center of track width matched to that of the head 31 scan the track also correctly.

Description

[Detailed description of the invention] The present invention relates to a helical scan VTR.

The present invention relates to an automatic scanning device for recording and automatically scanning the correct position of the town head.

In a conventional helical scan VTR, the tape travels f:! by a helical guide (hereinafter referred to as lead) formed in the cylinder. - The scanning position of the head relative to the tape during recording and playback has been regulated. However, as the recording track width becomes narrower, it becomes difficult to scan correctly and to ensure compatibility of glazes by relying on mechanical dimensional accuracy as in the past.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an automatic scanning device that is capable of performing consistent scanning during recording and reproduction without depending on read accuracy.

In order to achieve the above object, the present invention provides an auxiliary track separate from the main trunk, and records a tracking pilot signal intermittently on this part, and uses a multi-gap head to which this tracking pilot signal is fixed. During recording and reproduction, this recorded pilot signal is reproduced to perform recording and reproduction at the correct scanning position.

FIG. 1 schematically shows a tape running system according to an embodiment of the present invention, and FIG. 2 schematically shows a pattern recorded on the tape.

In FIG. 1, '1:1' is a magnetic tape, which is fed out from the supply reel 2 and wound onto the take-up reel /l/3.

4 is a full-width erase head, 5 is a 7-do for multi-gap recording,
6 is a fixed reproducing head, 7 is a pinch roller, and 8 is a capstan. Reference numeral 14 indicates a cassette containing the supply reel 2 and the take-up reel 3. In FIG. 1, a magnetic tape 1 is pulled out from a cassette 14 by movable tape guides 10, 11, 12. wear.

The fixed reproduction head 6 may be placed adjacent to the multi-gap recording head 5. The example in FIG. 1 shows an example of a so-called two-head Ω-wound helical scan VTR. 16.1
7 is a rotating magnetic head. 18 is a recording/reproducing head for audio signals. The audio signal recording/reproducing head 18 is unnecessary when recording with a rotary magnetic head by means of multiplexing the audio signal with the video signal or the like.

Figure 2 shows a schematic diagram of the recorded tape pattern.
In FIG. 2, reference numeral 20 indicates a recording track where the main signal is recorded, 21 and 22 indicate locations where the tracking pilot signal is recorded, and audio trunks are omitted. In this example, the frequency f is set to 21.

A pilot signal of frequency fl is recorded at 22. Since FIG. 2 is drawn schematically, the inclination angle θ of the recording track 20 is actually much smaller than that shown in the figure, about 3 to 6 degrees. The multi-gap recording signal is recorded intermittently in advance by a fixed multi-gap recording head 5, as shown in FIG. Ru. For example, four pilot signals surrounded by circles 23 in FIG. 2 are simultaneously recorded by the head 5. Therefore, the pilot signal is recorded in the longitudinal direction of the tape rather than in the direction of the recording track, but as mentioned above, θ is a very small value and the pilot signal is only recorded for a short period of time, so this difference causes a problem. do not have. As is clear from FIG. 2, pilot signals are recorded intermittently, and in the example of FIG. 2, pilot signals of frequencies f and f are alternately recorded.

In the example shown in FIG. 2, the interval between the gap centers of the multi-gap recording head 5 is twice the track pitch, and the time interval of one intermittent recording is one field period. Therefore, during recording, if the magnetic tape 1 is run at a predetermined constant speed and the multi-gap head 5 records pilot signals of frequencies f and f alternately at intervals of one field, as shown in FIG. A pilot signal recording pattern as shown in can be obtained. During recording and reproduction, the scanning position of the rotating magnetic head is controlled by this tracking pilot signal. For this purpose, in addition to the rotary magnetic head for recording and reproducing the main signal, a rotary magnetic head for reproducing the pilot signal is provided, and these are mounted on the same electromechanical transducer. Controls the position in the track width direction.

A suitable example of an electromechanical transducer is a piezoelectric bimorph made of a piezoelectric material.

The positional relationship of these heads is shown in FIG. 4, and the relative position with respect to the recording track is shown in FIG.

In FIG. 4, 6o is a cantilevered piezoelectric bimorph, with a pilot signal reproducing head 31. The erasing head 62 and the main signal recording/reproducing head 33 are arranged so that the center of the head track width is aligned in a straight line in the head scanning direction. These heads may be separate head chips, as shown in FIG. 4, or may be a composite head in which two or three of these heads are combined. Reference numeral 31 denotes a pilot signal reproducing head, which is an azimuth head having an azimuth angle θ. This is for the case where the multi-gap head 5 does not have an azimuth angle.If the multi-gap head has an azimuth angle θ as shown in Figure 6, the azimuth angle is unnecessary. . In the case of an azimuth head, due to the azimuth effect, the reproduction main signal is lowered by s, i.
# < It has the advantage that the pilot signal can be regenerated. Fifth
As is clear from the figure, when the head 61 traces exactly the center of the track, the detection level of the pilot signal of frequency f is equal to the detection level of the pilot signal of frequency f. Therefore, by using the difference between these two levels as a tracking error signal and controlling the piezoelectric bimorph by controlling the tracking servo so that this becomes 0, the head 61 will correctly scan the center of the track. The frequencies f, , f may be, for example, low frequency signals that are not used when the video signal is FM modulated, or signals within the FM signal band by making the recording position of the pilot signal coincide with the horizontal retrace position. 32 is an erasing head, and 33 is a main signal recording/reproducing head. The head trunk width center of the heads 32 and 33 is the head trunk width center of the head 31,
They are arranged to match the scanning direction. Therefore head 6
1 correctly scans the center of the track, the head 52.5
5 is also correct and can scan the trunk. This allows complete erasure and recording at the correct location.

In FIG. 5, 34 is a previously recorded recording track, and 65 is a newly recorded recording track. The above assumes the case of recording, but in the case of playback.

It is clear that by disabling the erasing head 52 and placing the recording/reproducing head 36 in the playback mode, correct operation can be achieved, just as in the case of recording. When a non-azimuth head is used as the pilot signal reproducing head 61, the pilot signal reproducing head 31 can be used as a main signal reproducing head, and the head 63 can be a recording-only head of a so-called recording/reproducing head separated type.

In this case, there is a concern that the detected pilot signal may interfere with the main signal, but since the pilot signal is regenerated intermittently, this position may be placed, for example, during the horizontal retrace period.

Figure 7 shows a block diagram of the tracking servo circuit. In FIG. 7, a signal detected by the pilot signal reproducing head 1 from the magnetic tape 1 is amplified by an amplifier 41, and then supplied to bandpass filters 42 and 43 having center frequencies f and f, respectively. The pilot signal reproduction levels on the left and right sides of the track are reproduced. These left and right pilot signal reproduction levels are held by hold circuits 44 and 45 for a certain period of time until the next pilot is reproduced, and then 1. , low pass filter 4
6.47, and the difference detection circuit 48 outputs a difference signal between the two. As is clear from FIG. 2, since the pilot signal of frequency f and the pilot signal recording position of frequency f are alternately recorded for each recording track on the left and right sides,
The polarity of the output of the differential circuit 48 is inverted by a polarity inverting circuit 49 in accordance with the head switching signal. The output of the polarity inversion circuit 49 is a tracking error signal for detecting track deviation, and its low frequency component is used to control the tape running speed. That is, the tracking error signal is input to the low-pass filter 50, and its output is supplied to a control circuit for controlling the capstan rotation speed, thereby controlling the tape running speed. The tracking error signal is inputted to the hector servo signal generation circuit 51, where appropriate frequency characteristic compensation and gain adjustment are performed, and the output thereof is supplied to the bimorph drive amplifier 52. The piezoelectric bimorph 6o is controlled and the tracking servo is turned off so that the head 31 is correctly positioned at the center of the track. In the above, we have considered using the piezoelectric bimorph 30 to scan the correct position even during one revolution of the head.

When high scanning accuracy is not required, better recording and reproducing operations can be achieved by controlling only the tape running speed using a tracking error signal without using a bimorph. In addition, although the head gaps are arranged in a direction inclined by 0 with respect to the tape width direction in FIG. 2.3.6, this may be in the tape width direction. In this case, the pitch between the gears will be slightly different.

FIG. 8 shows the structure of the cylinder portion of the present invention.

The right half of FIG. 8 is a sectional view, and the right half is a side view. The heads 31, 52, 33 are fixed to the free end of the piezoelectric bimorph 3o. The piezoelectric bimorph 3o is fixed to the pace 36, and the base 36 is fixed to the rotating cylinder 60 by screws or the like. As shown in the figure, a magnetic tape 1 is spirally wound around this rotating cylinder. A window 69 is opened approximately at the center of the rotating cylinder 60 in the direction of the rotational axis, and the heads 31, 32, 33 are disposed therein so as to slightly protrude from the outer peripheral surface. The rotating cylinder 6o is fastened to the disk 61 by screws or other means. Head replacement is achieved by replacing this rotary cylinder 60. The disc 61 has a slip lintaro 5 and a rotary transformer 6.
4 rotors are fixed. The disk 61 is fixed to the shaft 62 by means such as press fitting. The shaft 62 is supported by two upper and lower bearings 66 and 67 provided on the boss 63. The driving means for the shaft 62 is not shown, but it can be driven by a direct drive motor connected directly to the shaft, or a pulley can be fixed to the shaft 62 and the driving force can be transmitted from a motor at a remote location using a belt. You may do so.

68 is a stopper for applying voltage to the bearings 66 and 67. The slip ring 65 is for supplying voltage to the piezoelectric bimorph 30, and although not shown in the figure, a brush on the fixed side contacts this slip ring to form an electrical contact. The rotary transformer 64 has heads 31 and 32
．． 33, and as shown in Figure 1, it may be larger than the outer diameter of the rotating cylinder. As shown in FIG. 8, the present invention does not require precise tape position R regulation in the cylinder section, so a fixed tape guide or a spiral tape guide, usually called a lead, is unnecessary. , a so-called lower cylinder is no longer necessary, and a cylinder having a shape as shown in FIG. 8 can be used. of course.

It is possible to use a conventional lower cylinder having a fixed lead, but in that case, the mechanical precision of the lead can be deteriorated, and inexpensive parts can be used.

FIG. 9 shows a block diagram of the signal recording circuit of the present invention. A vertical synchronization signal is separated from the input video signal by a vertical synchronization separation circuit 71 . The separated vertical synchronization signal is compared with a tack pulse from a tack pulse generator representing the rotational phase of the cylinder section in a phase comparator 73, and its output is input to a control circuit 74 of a cylinder motor 75. At 74, a control signal is supplied to the cylinder motor 75 so that the rotation period of the cylinder motor 75 is synchronized with the frame period of the video signal, and the cylinder rotation speed and phase are controlled. On the other hand, the vertical synchronization signal is supplied to the gate circuit 76. Gate circuit 76
receives the output from the oscillator 77 of frequency f, and the oscillator 78 of f, and alternately outputs burst signals of frequency f and f for each field. The output of the gate circuit 76 is supplied to a recording amplifier 79, and a burst pilot signal is recorded on the magnetic tape 1 by the multi-gap recording radar 5. During recording, the tape speed is kept constant by controlling the capstan motor so that the capstan rotational speed is constant.

In the above embodiment, the so-called fly-in erase is performed using the erasing hect 32, but it is of course possible to erase using the full-width erasing head 4 shown in FIG. In this case, the reproducing head 6 reproduces the pilot signal, and by determining the recording timing of the burst-shaped pilot signal recorded in the multi-gap recording by the reproducing timing of the reproducing head 6, the pilot signal is recorded on the tape at equal intervals. You can also.

By doing this, it is possible to prevent synchronization from being disrupted when the recording signal changes. Of course, the head 6 is not required when synchronization disturbance is not a problem. In this case, a constant voltage is applied to the piezoelectric bimorph 30 to correct the difference in recording position between the already written signal and the newly written signal. The reproducing head 6 does not need to be a ma/l/multi-gap head (it may be a single-gap head).

As is clear from the above description, the embodiments of the present invention are not limited to the on-tape recording pattern shown in FIG. 2, and can be modified in various ways. For example, in the example shown in FIG. 2, the pitch of the gap center of the multi-gap recording head is twice the video signal track pitch, but this is not limited to twice, but can be any integral multiple of 2 or more. Furthermore, although the recording period of the pilot signal is set to the repetition period of the recording track (the field period in the examples shown in FIGS. 1 and 2), this may be any odd multiple of the period of the recording track.

As is clear from Figure 2, the number of tracking error samplings per recording track N is equal to the number of gaps in the multi-gap head.As shown in Figure 2, the total recording width of the video signal is assumed, and the track pitch is If it is P, it becomes NkiB-Hiki■-2aH. Here, nH is the number of horizontal scanning lines in one field, α
■ is the number of H sequences.

When nH=262.5 and aH=0.5 to 5.5, the minimum number of sampling times is close to 5o, and tracking error can be measured with sufficient accuracy.

Therefore, as mentioned above, even if the number of locations where pilot signals are recorded is somewhat reduced, sufficient tracking error detection accuracy can still be obtained. Therefore, it is possible to reduce the number of samplings, that is, the number of gaps.

Further, as shown in FIG. 10, pilot signals of frequencies f and ft may be alternately recorded on adjacent tracks during recording. In the example shown in FIG. 10, the pilot signal is recorded in bursts at one frame period. In this case, the head structure becomes complicated because different signals are recorded depending on the gap. It is preferred to use a so-called multi-channel head. The multi-channel head is made for an audio PCM tape recorder or a combination magnetic recording/reproducing device, and can be used in the present invention by only changing some of the specifications. Additionally, when using a multi-channel head, this device can be used not only as a video recording device, but also as an audio PCM tape recorder.
This is clear from FIG. 1 and the previous description. In this case, it is also possible to use the magnetic tape effectively by providing a mechanism for moving the disks 5 and 6 in steps in the tape width direction to change the recording track position.

FIG. 11 shows a recording pattern on a tape according to another embodiment of the present invention, and FIG. 12 shows its head positional relationship. In the case of this embodiment ψ, unlike in FIG. 2, there is no card band between recording trunks, and it is effective in the case of an overwriting recording method using a so-called azimuth hect. As is clear from FIG. 11, in this embodiment, during recording, the signal that has already been written is erased by the full-width erasure RAD 4, and the burst-like pilot signal of frequency f and the burst-like pilot signal of frequency ft are each Records alternately at field intervals. Tracking is carried out in the same way as described in connection with FIG.
Controls 0. In this example, since the trunk width of the recording/reproducing head 33 is wide, the tracking pilot signal is erased by so-called overwriting. However, as is clear from FIG.
The pilot signal is reproduced by this method, and this pilot signal can play the role of correctly scanning the head during recording. However, in this example, the pilot signal written by the multi-gap recording head has been erased during reproduction and cannot be used. However, regarding auto-tracking during playback, various methods have been devised in the past, and these can be used.

For example, the recording angle hect 33 newly records low frequency pilot signals C':, ft, f's, fa) of four different frequencies on each recording track in order, and crosses them from both adjacent tracks during playback. Due to the level difference of the pilot signal (differentiated by frequency) reproduced as a talk component,
Any method known in the art for detecting tracking errors can be used. In other words, the most basic reason why the lead provided in the cylinder is necessary is correct, including the influence of the head level difference between both heads during recording.

The purpose is to cause the head to scan, and this can be achieved by the present invention. Biloft signal frequency f,.

For f, select a frequency that can be erased as much as possible due to overwriting, but if a sufficient erasure rate cannot be obtained, select the recording position within the horizontal retrace interval to avoid affecting the playback image quality. You can also choose not to give it. Further, during reproduction, the recording/reproducing head 33 can reproduce the tracking pilot signals (f; , f; , f, , f4), and the video signal can be reproduced by the pilot signal reproducing head 31, contrary to the recording. The advantage of this method is that crosstalk components from adjacent tracks are small and good reproduced image quality can be obtained. In this case, the recording/reproducing head 33 does not need to be an azimuth head, and a non-azimuth head can be used. The head positional relationship in this case is shown in FIG. In this case, a multi-gap recording head having the azimuth shown in FIG. 6 is used. In FIG. 13, the head 81 is used for reproducing the pilot signal (f+-'t) during recording, and is used for reproducing the main signal (video signal) during reproduction. The head 83 receives a main signal and a pilot signal (f; + ft * 's I '4) during recording.
For recording, the pilot signal (f;, 't
.

fs, f'4). Of course, the tracking method during playback is the above 4-frequency one (other pilot methods other than the pilot method may also be used (and do not overwrite).
If there is a slight guard error, a so-called wobbling method may be used in which the head is forcibly vibrated to obtain a tracking error.

FIG. 14 shows a recording pattern on a tape according to another embodiment of the present invention. This case is most suitable for recording video signals separately into, for example, a color signal (C signal) and a monochrome signal (Y signal). FIG. 15 shows the head arrangement of this embodiment. 1st
In Figure 4, 96 is the recording track of the main channel, 97
indicates the recording track of the auxiliary channel. 14th. ．． 1
As is clear from FIG. 5, this embodiment is characterized in that the recording track of the auxiliary channel is provided in the guard band portion of FIG. 2. If the main channel is a monochrome signal and the auxiliary channel is a color signal, the color signal does not exist in the horizontal synchronization part, so it is possible to fit the pilot signal into this part. This will be explained in more detail with reference to FIG. As shown in the figure, the pilot signal (frequency f
, and ft) are inserted into the horizontal synchronization portion of the auxiliary track, detected by the pilot signal reproducing head 91, and converted into a tracking error signal. Reference numeral 94 denotes an erasing head for the auxiliary channel, which is in a fixed positional relationship with the recording/reproducing head 95 of the auxiliary channel, and erases other parts except for the horizontal synchronization part. Auxiliary channel recording/playback head 95
records the color signal and does not record the horizontal sync part. 92 is an erase head for the main channel, and 95 is a recording/reproduction head for the main channel. Hects 91°92.95, 94.95 are all fixed on the same piezoelectric bimorph. Also, erasing heads q2 and 94 are integrated, and the pilot signal erased by the erasing head is transferred to the recording/reproducing head 95 of the auxiliary channel.
When recording, it may be possible to re-record exclusively in the horizontal synchronization part. It is also obvious that the auxiliary channel may be an audio signal, for example, instead of a color signal.The above has described an embodiment of a so-called two-head helical scan force type, but of course the present invention also applies to a two-head heli scan force type. It is obvious that the present invention is not limited to this formula, and can also be applied to a so-called 1-head or 1.5-head method in which a tape is wound around a cylinder at nearly 660 degrees. Figure 16 shows a tape pattern for a 1.5 head Ω winding method.

Recording track 101 is recorded with an auxiliary head for vertical blanking period recording, and recording track 102 is recorded with a main head for recording main signals. As shown in FIG. 16, by making the level difference between the main head and the auxiliary head in the rotational axis direction an integral multiple of the track pitch, the recording track 102 recorded by the main head in the scanning direction of the rotating magnetic head and the recording track 102 recorded by the auxiliary head are The recorded recording tracks 101 can be aligned. By doing this, even at the moment when the head currently recording a signal is transferred from the main head to the auxiliary head, there is no jump in the tracking error value, making it possible to perform correct recording and reproduction.

The embodiments have been described above assuming that moving images are recorded and played back. However, the present invention is not limited to this. It is possible to hold the tape still and record one frame of still images, move the tape a certain distance and hold it still, and record images one frame at a time one after another. Thereby, the present device can be used as an image frame device for still images. According to the present invention, since there is no need to provide a fixed lower cylinder as shown in FIG. 8, it is possible to significantly reduce the sliding area between the magnetic tape 1 and the fixed tape guide section. In the rotating cylinder part.

Direct contact between the tape and the cylinder is avoided by the action of the air formed as the cylinder rotates. Therefore, the tape life can be greatly improved, making it suitable for image border devices. It is obvious that the present invention can be used not only for recording and reproducing digital data, but also for producing high-performance data recorders using the present invention. It is also possible to reproduce images recorded one frame at a time by running the tape continuously, and it can also be used as a long-time recording VTR with good image quality.

Further, digital data related to the recorded image can be recorded auxiliary using the pilot signal, and this can be reproduced by the reproduction vector 6.

For this purpose, for example, the signal phase of the signal of frequency f or f may be changed by 180° depending on the value of the digital data 1# and %Q#. Even in this case, tracking signal detection is not affected. At the time of reproduction, the original data 'Xi#%Q# can be distorted by comparing the phase with a signal reproduced on a reference trunk, for example.

In the above, a piezoelectric bimorph was taken as an example of a position control device for a rotating magnetic head, but of course, it is not limited to this, and other devices can be used as well! It is also possible to use the firing machine conversion element 1, for example, one using an electromagnet.

In addition, as tracking pilot signals, two types of frequencies f, , f have been used in the previous embodiments, but instead, two types of frequencies can be used by changing the phase by 180 degrees, for example, by using one type of frequency. It can also be used as a pilot signal. In this case, the pilot signal is a signal synchronized with the horizontal synchronization signal of the video signal, and the phase can be determined based on the horizontal synchronization signal during reproduction.

According to the present invention, in a magnetic recording/reproducing device using a rotating magnetic head, it is possible to record and reproduce signals at correct positions without depending on mechanical accuracy. Therefore, it is possible to produce a magnetic recording/reproducing device that is inexpensive, can achieve a recording density of 1, and has less tape damage.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a tape running system according to an embodiment of the present invention, FIG. 2 is a diagram showing a recording pattern on the tape, FIG. 3 is a diagram showing a multi-gap recording head used in the present invention, and FIG. The figure shows the mounting state of the rotating magnetic head, Figure 5 shows the positional relationship of the rotating magnetic head that passes through the recording track, and Figure 6 shows a multi-gap head with another structure. , FIG. 7 is a block diagram of the servo circuit, FIG. 8 is a diagram showing an example of the cylinder structure, FIG. 9 is a block diagram showing an input signal recording circuit, and FIG. 10 is a block diagram of the present invention. FIG. 11 shows a turn of recording on a tape in another embodiment of
12 is a diagram showing a recording pattern on a tape according to still another embodiment of the present invention, FIG. 12 is a diagram showing the positional relationship of a rotary magnetic head with respect to the recording track, and FIG. 15 is a diagram showing a rotary magnetic head according to still another embodiment of the present invention. 14 is a diagram showing recording turns on a tape according to still another embodiment of the present invention. FIG. 15 is a diagram showing the positional relationship of the rotary magnetic head with respect to the recording track. The figure is a diagram showing a recording turn on a tape according to still another embodiment of the present invention. 1: Magnetic tape 4: Full-width erase head 5: Multi-gap recording head 6: Fixed reproduction head 15 Nijilinda 20: Recording track 30: Piezoelectric bimorph 31. 81, 91: Pilot signal reproduction head 32,
? 2.94: Erasing head 33.83: Main signal recording/reproducing head 93: Main channel recording/reproducing head 95: Auxiliary channel recording/reproducing head O 1 Mouth, c; Mouth, 91 Tora・nokinku errorzu self 5 3rd mouth 3.3 Fang 7 Fig. 7 78 O 70 Mouth O 11 Koku off 2 Koku 3 Further cutting direction blade' / 3 /4 膓オノ5rf3 LJl and Σ direction

Claims (1)

[Claims] (1) In a helical scan VTR, a plurality of channels 7
A fixed multi-gap magnetic head with a dog gap intermittently records a tracking pilot signal, and a rotating magnetic head reproduces the tracking pilot signal during recording of the main signal and/or during horse riding. . An automatic scanning device for a magnetic recording/reproducing apparatus, characterized in that the relative position of a rotating magnetic head and a magnetic tape is controlled by the reproduction pilot signal. Q) Claim 1, characterized in that the tracking pilot signal having a frequency of 2ffi is recorded alternately and intermittently in the multi-gap magnetic head.
An automatic scanning device for a magnetic recording/reproducing device according to paragraph 6), wherein the tracking pilot signal of two types of frequencies is transmitted to the multi-gap magnetic head. 2. The automatic scanning device for a magnetic recording/reproducing device according to claim 1, wherein recording is performed alternately so that frequencies differ between adjacent head gaps. (4) A patent claim characterized in that the recording section of the tracking pilot signal and the horizontal retrace section recording section of the video signal are made to coincide in the width direction of the video signal recording track, so that the former is included in the latter. An automatic scanning device for a magnetic recording and reproducing device according to item 1. (5) The rotary magnetic head divides the recording signal into a main channel and one or more subchannels and records them on separate recording tracks, and records the tracking pilot signal on a part of the recording track of the subchannel. An automatic scanning device for a magnetic recording and reproducing device according to claim 1, characterized in that: (6) The tracking pilot signal recorded by the multi-gap magnetic head is phase-modulated with another information signal, the pilot signal is reproduced and demodulated by a fixed reproduction head, and this information signal is reproduced. An automatic scanning device for a magnetic recording/reproducing device according to claim 1. (7) By continuously recording information signals with the multi-gap magnetic head and reproducing them with a fixed reproducing head, the rotary magnetic head can perform signal recording and reproducing functions, and the fixed multi-head can record signals. An automatic scanning device for a magnetic recording and reproducing device according to claim 1, characterized in that it also has a reproducing function.