JPS6083247A - magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates particularly to tracking control of a rotating hand magnetic recording/reproducing device. [Background of the Invention] In a conventional rotary head type magnetic recording/reproducing device such as a helical scan VTR, a magnetic tape is provided at the end of the magnetic tape for tracking control to ensure that the rotary head correctly scans the tracks formed on the magnetic tape. A method is generally used in which the rotation phase of a rotary head or the running phase of a magnetic tape is controlled based on a control signal recorded on a control track. However, in the conventional method using control signals, the relative positional relationship between the control head that records and reproduces the control signal and the rotary head must be constant for each device, and if this differs, tracking cannot be performed correctly. There was a problem in that the reliability of the device was impaired, such as the loss of data and the difficulty of compatible playback. In order to improve this, instead of using the conventional control signal, a so-called pilot signal is frequency-multiplexed with the signal to be recorded, such as a video signal, and recorded, and the pilot signal reproduced from both adjacent tracks during playback is Some methods have been proposed for tracking control by controlling the tape speed so that the crosstalk amount (t) is equal. A method is known in which trunking control is performed by applying pilot signals at one frequency, two frequencies, six frequencies, or four frequencies. As a method of using a single-frequency pilot signal, for example, as described in the literature (Japanese Patent Publication No. 56-20621), as shown in Fig. 1, the pilot signal is recorded between tracks whose recording positions are adjacent to each other. A method is known in which a plurality of records are recorded in the longitudinal direction of a track so that they are not adjacent to each other in the direction perpendicular to the longitudinal direction of the track. In FIG. 1, if H is the horizontal scanning unit of the video signal, then
With the H deviation amount at the track end being 1.5H, the pilot signals are recorded at the positions shown in the shaded areas of each track A and H so that adjacent tracks are lined up with each other in the direction orthogonal to the longitudinal direction of the tracks. , if the head scans track B1 in the figure during playback, the pilot) bl
Based on the reproduction of A1, the amount of crosstalk of the pilot a21 reproduced from the adjacent track A2 and the adjacent track A1
Tracking control is performed so that the amount of crosstalk between the two is equal, and when the head scans the next track A2, the amount of crosstalk of the pilot a12 reproduced from the pilot a22 is detected. The pilot b2 played from the adjacent track B2 based on
1 and the amount of crosstalk of the pilot b15 reproduced from the adjacent track B1 are detected, and tracking control is performed so that the amount of crosstalk between the two becomes equal (752). In the known example shown in FIG. 1, the basic condition is that adjacent tracks be lined up by H, and tracking error information is obtained at least once from the scanning start point of each track (point indicated by S in the figure). As is clear from the above description of the operation, the recording period TA of the pilot signal required for this is maximum when scanning the track A2, and is given by the following equation. TA = 7, 5 H.(1) Still, the period 1゛E during which tracking error information is obtained per detection is given by the following equation. 'l'B = 1. oH...(2) In the known example shown in FIG. 1, as is clear from the above, the pattern in which tracking error information is detected from both adjacent tracks each time each track is scanned is exactly the same for tracks A and B ( In other words, the timing at which tracking error information is detected is the same for tracks A and B, such that crosstalk is detected from the lower track in the diagram, and then crosstalk is detected from the upper track in each track. Therefore, there is a problem of stabilization in a so-called reverse tracking state (i.e., a state in which head A scans track B: head B: 6: track A), and in order to prevent this, it is necessary to determine whether the track is A or B. Some measures such as identifying crabs are necessary. Next, as a method using two-frequency pilot signals,
For example, as described in the literature (Japanese Unexamined Patent Publication No. 54-3507), a two-frequency pilot signal f is shown in FIG.
A method of recording I, f= alternately by 2H in the longitudinal direction of the track and alternately by 1H between adjacent tracks is known. In this Fig. 2, the amount of H deviation at the track end is
Similarly to the figure, 1.514 is specified so that adjacent tracks are lined up in H in the direction orthogonal to the track longitudinal direction, and the pilot signal f1 is placed at the position shown in the shaded area of each track A1B, and the pilot signal f1 is placed at the position shown in the blank area. The pilot signal f2 is recorded in each of the . For example, when the head scans track B1 in the figure during playback, b and C
The adjacent track A1 based on the playback track A1) ft
The amount of blind crosstalk of the pilot f reproduced from a of the track A2 and the amount of crosstalk of the pilot f1 reproduced from d of the adjacent track A2 are detected, and tracking control is performed so that the two become equal. Furthermore, when the head scans the next track A2, the playback pilot f from d and e
Based on +, the amount of crosstalk of the pilot f2 reproduced from C of the adjacent track B1 and the amount of crosstalk of the pilot f2 that can be reproduced from f of the adjacent trunk B2 are detected, and tracking control is performed so that the two become equal. In the known example shown in FIG. 2, the two basic conditions are that the adjacent tracks are lined up in H75, as in FIG. The pilot signal recording period TA required to obtain tracking error information is maximum when scanning track B1, and is given by the following equation. TA = 6, D H (6) Furthermore, the period TE during which tracking error information is obtained for one detection is given by a quadratic equation. 'l'E = 1, OH...(4) In addition, in this known example, two-frequency pilots are recorded alternately on each track, so it is stabilized in the reverse trunking state as in the known example shown in Fig. 1 above. There are problems with crabs, and truck identification is required. Next, as a method using three-frequency pilot signals,
For example, as described in the literature (Japanese Patent Publication No. 56-20622), there is a method in which three-frequency pilot signals f1, f2, and f5 are sequentially and cyclically recorded every three tracks in the order shown in Fig. 3. It is publicly known. Further, as a method of using four-frequency pilot signals, for example, as described in the document (Japanese Unexamined Patent Publication No. 55-116120), four-frequency pilot signals f1, f2, A method is known in which recording is performed cyclically and continuously in the order of f5 and f4. In both of these, tracking control is performed so that the amount of crosstalk between pilot signals of different frequencies reproduced from both adjacent tracks is equal to each other. In the known examples shown in FIGS. 1 to 4 above, the pilot signal is frequency-multiplexed and recorded on the video signal to be recorded, so the pilot signal mixes with the video signal and generates spurious signals. There is an essential problem, and in order to reduce its influence, the recording level of the pilot signal has to be lowered by an inch compared to that of the video signal, and as a result, the S/N of the reproduced pilot signal becomes insufficient. Performing stable tracking control 75: becomes difficult;
There has been a problem in that the feature of improving tracking accuracy by detecting tracking error information in the longitudinal direction of the track not temporally minutely or continuously can not be fully utilized. Further, in the known examples shown in FIGS. 1 and 2, it is necessary to ensure H alignment between adjacent tracks, which poses a problem that greatly limits the magnetic recording/reproducing apparatus. [Object of the Invention] In view of the above-mentioned prior art, an object of the present invention is to eliminate the need for any restrictions such as H level between adjacent tracks, minimize the recording area of pilot signals used for tracking control, and It is an object of the present invention to provide a magnetic recording/reproducing device capable of performing stable trunking control while obtaining a sufficient S/N ratio. [Summary of the Invention] The first feature of the present invention is that three-frequency pilot signals are distributed in the longitudinal direction and vertical direction of the track in relation to the amount of misalignment between adjacent tracks at the end of the track. The second feature is to minimize the recording area so that the maximum amount of tracking error information can be obtained in terms of time, and the third feature is to eliminate the need for different track positions and achieve stable and reliable l-racking. The fourth percentage point is to obtain sufficient S/N by partially occupying the recording area of the pilot signal in the longitudinal direction of the track so as to obtain a sufficient recording level of the pilot signal. The goal is to make sure that the results are obtained.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to Examples. FIG. 5 is a diagram showing an embodiment of a servo control device during recording when the present invention is applied to a rotating head type helical scan VTR, and FIG. 6 is a waveform diagram of each part for explaining its operation, and FIG. FIG. 7 is a diagram showing the track pattern recorded and formed by this, FIG. 8 is a diagram showing an embodiment of the tracking control device during playback, and FIG. 9 is a waveform diagram of each part for explaining its operation. be. In Figure 5, a magnetic tape capstan motor 2
The capstan motor 20 is rotated at a constant speed by a capstan servo circuit 21. Rotating magnetic heads 180' from each other above 4.5 disks 2
The disk 2 is rotated together with the disk 2 by a disk motor 6. 1806 on 1 tape and 2 disks
Wrapped in a slightly more thread, therefore the seventh on the track
Overlapping portions shown as QI and Q2 in the figure are formed. A magnet 3 is attached to the disk 2, which is detected by the tack head 7 to obtain a norus (a in FIG. 6) synchronized with the rotation of the magnetic head 4.5. This pulse from the tack head 7 is transmitted to the phase adjustment circuit 8.
After the phase is adjusted so that the magnetic head 4.5 and the tape 1 have a predetermined relative positional relationship, the output (6th
The signal b) in the figure is supplied to the pulse forming circuit 11. From this pulse forming circuit 11, a pulse C (c in FIG. 6) with a data ratio of 50 degrees synchronized with 4.50 rotations of the magnetic head (c) i:
Output. It is a 12-digit delay multi-circuit, and the pulse from circuit 11 (
The circuit 12 generates a pulse D (d in FIG. 6) with a width of 10 times, which is triggered by both the rising and falling edges of j, and which corresponds to the amount of misalignment between adjacent tracks at the track ends, which will be described later.
It will be outputted. The delay multi-circuit 16 -C1 is triggered by the falling edge of the pulse D of this circuit 12 or C) and generates a pulse E(of the width of time 21).
e) in FIG. 6 is output. Furthermore, the delay multi-circuit 14
is triggered by the falling edge of pulse E from 1 circuit 13 for a predetermined time! A pulse F (1 in FIG. 6) having a width of 0 is output. It is a 15-digit latch circuit, and the pulse C from circuit 11
is latched at the falling edge of pulse F from circuit 14, so that pulse C from circuit 11 is
-4-to) delayed pulse G (fI in Figure 6)
is output from the circuit 15. The pulse G from this circuit 15 is supplied to one side of the disk servo circuit 16, and to the other side, a vertical synchronization signal of the frame period of the video signal to be recorded is supplied from the terminal 100 as a reference signal for the disk servo Jζ system during recording. be done. In this disk servo circuit 16, the phases of the Norculus G from the circuit 15 and the reference signal from the terminal 100 are compared, and a phase error signal corresponding to the phase difference between the two is outputted from the circuit 16 and supplied to the disk motor 6.
As a result, the pulse G is servo-controlled to be phase-synchronized with the reference signal, and the magnetic head 4.5 is rotated at a rotation speed equal to the frame frequency. 17 is a two-phase split circuit, and the curs E from circuit 16 is
is divided into two phases by the Norculus C from the circuit 11. During the period when the pulse C is "H", the Norculus H (h in Fig. 6) is generated, and during the period when the Norculus C is "L", the pulse l is generated. (i in Figure 6)
) are output alternately. This is a 19-digit pilot generation circuit, and three-frequency pilot signals fO1fI, f= are generated. The frequency of each of these pilot signals is determined using an arbitrary frequency fx, for example, as follows. 18 is a pilot selection circuit, in which the pilot signal fO is selected for a period of pulse width 1 by the pulse D from the circuit 12, and the pilot signal f1 is selected for the period of the pulse width 21 by the pulse H from the circuit 17. , and the pulse I selects the bamboo pilot signal f2 for a period of pulse width 21. Therefore, from the circuit 18, as is clear from FIG.
1, and during the period when pulse C is L" (pulse O is H"), the pilot signal is fI'1. Output can be completed alternately in the order of f2. The pilot signal from this circuit 18 is sent to the magnetic head 4 together with the video signal via the video signal recording processing circuit.
．． 5 are recorded alternately. FIG. 7 is a diagram showing a track pattern recorded and formed by the above recording servo control device. In the same figure, Ql,
Q2 indicates an overlap portion formed by winding the tape 1 around the disk 2 by more than 180°, and the pilot signal is recorded in the area indicated by P of the overlap portion Q1. Still, ■ is the recording area of the video signal formed by winding 180', and the video signal is also recorded in the overlap parts Q1 and Q2 other than ■, so in this case, only P
The pilot signal is frequency-multiplexed and recorded together with the video signal in the region of Therefore, this is true of the purpose of separating the pilot signal recording area and the main signal recording area, which is one of the points of view of the present invention. It goes without saying that in order to completely separate the two, it is sufficient to temporarily stop recording the video signal in the area P. Further, even if signals other than the main signal are recorded in the P area or the areas before and after the P area, this does not depart from the spirit of the present invention. (Notes below) Clarification of the specification (no changes to the content) In this Figure 7, the amount of normal deviation between adjacent tracks at the track end (τ in the figure) is calculated as follows: It is determined according to the rotation speed of the rotary spatula l'4.5, and is determined by the amount of time τ for scanning the rotary head. On the other hand, as described in FIG. 6, the high lot signal fO is recorded rM4 times at a time equal to the above-mentioned normal distortion cover τ, and the pilot signals f1 and f'21, as well as the 10-dimensional signal foe, are subsequently recorded in the above-mentioned normal deviation. It is recorded for a time 2τ equal to twice the amount of wear. Therefore, as shown in FIG. 7, the recording start point of the pilot signal +if+ or J2 on the trunk coincides with the recording start point of the pilot signal JO on the subsequent adjacent track, and Alternatively, the recording end point of f2 coincides with the recording start point of pilot signal fl or f2 on the adjacent trunk that follows it, respectively.Next, FIG. FIG. 2 is a diagram illustrating an embodiment of a tracking control device during playback,
The operation will be explained using the waveform diagram of FIG. 9. It should be noted that although the carho control device during playback is not particularly shown, it can be used in most parts in common with the recording servo control device shown in FIG. A video signal reproduction processing circuit is used instead of 500, a predetermined reference signal of a frame frequency is input to the terminal 100 instead of a vertical synchronization signal of a frame period, and a signal from a tracking control device shown in FIG. Everything else is the same except that the tracking error signal is supplied to the capstan motor 20 via the capstan servo circuit 21. Therefore, the operation shown in FIG. 8 will be explained with reference to FIG. 5 in part. In FIG. 5, during reproduction, a frame frequency reference signal is input to the terminal 100, so the pulse G from the circuit 15 is servo-controlled to be phase-synchronized with the reference signal, as described above, and the magnetic head 4° 5 is rotated at a rotational speed equal to the same frame frequency as during recording. The signals alternately reproduced from the tape 1 by the magnetic heads 4 and 5 are sufficiently amplified in a video signal reproduction processing circuit (not shown) and then input to the low-pass filter 30 via the terminal 60 in FIG. A pilot signal is extracted. 19 in FIG. 8 is a pilot generation circuit;
They are given the same reference numerals because they can be the same as those in the figure. 37
is a pilot selection circuit, and one side of it has pilots <s> from the pilot generation circuit 19: fs and f2.
is input, and the pulse forming circuit 11 of FIG. 5 is input to the other side.
A pulse C from is inputted via terminal 70. In this pilot selection circuit 37, during the period when the pulse C is "H",
That is, during the period when the pilot J'l is selected during recording (k is the period during which the magnetic head 4 scans the tape), the pilot f1 is similarly selected, and during the period of pulse C force L'', that is, during recording, the pilot f2 is selected. is the selected period (
Therefore, the period during which the magnetic head 5 scans the tape is the same as that in A1 (pillowers 1-f2 are selected, and in both A1 and A1, at least the pilot area P in FIG. 7 is selected).
During the scanning period, the pilot signals ft and f2 are selectively output, and during other periods, the pylon I-(M) is not output. The output from this circuit 37 is supplied to the frequency conversion circuit 31 as a local pilot signal. In the frequency conversion circuit 31, the regenerated pilot signal from the filter 30 is frequency-converted by the local pilot signal from the circuit 37, and the difference frequency component between the two is output from the circuit 31. 32 and 38 represent the resonance frequencies 2fx and fx, respectively. 33 and 39 are detection circuits that detect the envelope of the output of 32° and 38. In Fig. 7, when the head scans the same track that was recorded, for example, if the magnetic head 5 When scanning track B1 where pilot signals fo and f2 are recorded (
The waveforms of various parts in FIG. 8 at this time are shown by the peaks in FIG. ),
In the pilot region P, pilot signals fO and f2 are first generated from the main track B1. Additionally, pilot signals fO and f are sent from the adjacent trunk A1 on the upper side of the figure.
t is detected as crosstalk, and the pilot signals fO and fl are also detected as crosstalk from the adjacent track A2 of [downward and downward], and each pilot signal from these two adjacent tracks is detected at different timings, and is Since they are detected with a time lag, the two do not overlap in time. On the other hand, as described above, during the scanning period of the magnetic head 5, the circuit 37 outputs the local pilot signal f2, and the reproduced pilot signals from the main track and adjacent tracks are frequency-converted by the local pilot signal f2 in the circuit 31. Therefore, the difference frequency component from the circuit 31 is the component of fO~f2=fx (a in FIG. 9) and ft~
f2=2fx (#' in FIG. 9)) is output. That is, from the main track B1, the pilot signal f
Only the component of the output fx based on o4 (2 in Figure 9a)?τ
The pilot signal f2 is not detected because the difference frequency becomes zero. Further, from the adjacent tracks A1 and A2, the output 2fX component based on the pilot +-<S number fl is detected for a period of 2τ with a time difference of 2τ from each other, as shown in χ and y of the 9th y+b. It should be noted that the components of the output fX based on the pilot signals fO of these adjacent tracks A1 and A2 (α1, a- in Fig. 9) are also detected, or if the main track is being scanned dominantly, its detection level (-, y) is sufficiently lower than the detection level (Z) based on the pilot signal fO from the main track. The fx component from the circuit 31 is extracted by the tank circuit 38, sufficiently band-limited and amplified, and then sent to the envelope detection circuit 3.
The signal is detected at 9ζ, and further pulse-shaped by a pulse shaping circuit 4° using an appropriate threshold value. Therefore, from the circuit 40, as shown in FIG.
A pulse can be obtained only by the detection output method (Z) based on the signal fo. Furthermore, as is clear from the above, the 2fx component (χ, y) from the circuit 31 contains only the cross-studied component of the pilot signals from both adjacent tracks, and its detection level corresponds to the tracking error, and the main When the center of gravity of scanning for track B1 passes into the upper adjacent track A1, the detection level (2+) in the first 2τ period increases, and the detection level (y) in the next 2τ period decreases. , Similarly, if the center of gravity of the ζ scan is shifted to the lower adjacent track A2, the above relationship becomes completely reversed. Therefore, by comparing the detection levels of these two (2 and y-), it is possible to detect the amount of trunking error and the polarity of both. 2 from the above circuit 31. The fx component is extracted by a tank circuit 32, sufficiently band-limited and amplified, and detected by an envelope waveform circuit 33, the output of which is supplied to one of sample and hold circuits 34 and 35. On the other hand, the pulse from the previous circuit 40 is supplied to a sunfling pulse generation circuit 41, which generates two sampling pulses 8P1♂SP2. The first sampling pulse 8P1 (d in FIG. 9) has a pulse width of 2τ or so! It is generated by being triggered by the rising edge of the pulse from the circuit 40 so that it is less than 1. Further, the second sampling pulse SP2 (e in FIG. 9) is generated with a delay of approximately 2τ from the first sampling pulse 2. This first
The sampling pulse SPI of the circuit 34 is supplied as a sampling pulse of the circuit 34, so that one of the sampling pulses SPI is supplied from the circuit 34.
ean) An error voltage based on the tracking error from the rack (AI) is output 11. Further, the second sampling pulse SP2 is supplied as a sampling pulse to the circuit 35, and therefore from the circuit 35 to the other adjacent track (
An error voltage based on the tracking error from A2) is output. The errors L- from these circuits 34 and 35 are compared in a comparison circuit 36, and the output thereof is connected to a terminal 80 and supplied to the cab stan search circuit 21 shown in FIG. The stun motor 20 is controlled by negative feedback 4). The above operation is performed when scanning the next main track A2%-magnetic track 4 following the main track B1 (the waveforms of each part of FIG. 8 at this time are shown in (11) of FIG. 9). 0) is performed in the same way, and in this case, ζ is the local pilot signal f1 selected from the circuit 37, or P-fA output, everything else is the same, and the waveforms of each part are similar in length. becomes. Through the above operation, the tape speed is controlled so that the magnetic head scans the main track 17, so that the crosstalk of the pilot signals from both M-contact tracks is equal to each other. controlled. Next, FIG. 10 shows the waveforms of each part of FIG. 8 in the reverse tracking state, for example, when the magnetic head 4 scans a different track B1 from the one recorded. In this case, the fx is selected to scan the trunk B1 in which the pilot signals fO and f2 are recorded, and therefore, the circuit 31 outputs <fX component (Z in FIG. 1O) + This is followed by the same 1-pi from rack B1 [j so+'(=<2fX component (10th W) based on f2
Detected 11, both PA dependent tracks A, 1. The kink error information based on the par lot IB'4hζ from A2 is not detected. Therefore, it is clear from the waveform of the 101'J+ that the output − pressure from the circuit 34 and the circuit 3
The output voltage from 5 (the fact that IS is unbalanced with respect to each other. It is clear from 17) is due to the reverse tracking.・Retribution: ・Te (I') Is it possible to obtain a large error intraocular pressure from the circuit 36? The above action is one of the key points of the present invention;
In other words, A' is obtained by alternately switching hJ2 in accordance with the magnetic/\t scanning. i) Automatically performs A to L. Through the above tracking control, the video signals alternately reproduced by the magnetic heads 4 and 5 from the video recording area V in FIG. The signals are switched and one continuous reproduced video signal is output. This reproduced video signal is never mixed with a reproduced Byronto signal. As is clear from the above, the pilot signal recorded in the overlap part Q1 in FIG. It is possible to obtain a regenerated pilot (D number) and perform stable tracking control.The present invention also provides a pylon (pylon) (Q number) in relation to the misalignment amount τ between adjacent tracks at the track end. The amount of normal strain τ can be set arbitrarily, and is not restricted by it as in the above-mentioned known example.Furthermore, related to this amount of normal strain τ [
I can do it. To compare this with the previous known example, ``If the above-mentioned misalignment amount τ is set to τ = 1.5H as in the known example, the recording period l11A of the pilot signal required to obtain at least one tracking error information is It is obtained by the following formula. TA=3τ=4.5H・・・・・・・・・(6)
The period TE during which tracking error information is obtained per detection is given by the following equation. TE=2τ=3. OH・・・・・・・・・・・・(7
) As is clear from comparing equations (6) and (7) above with equations (1) to (4) above, the present invention can minimize TA and maximize TE. I understand. In particular, increasing 1゛E means that more tracking error information can be detected over time, allowing for more accurate tracking control and superior temporal integration effects, resulting in more stable tracking control. You can get the effect. In addition, in the embodiment of FIG. 5, the pilot signals fl and f2
The case is shown in which LLt E is maximized by setting the recording period of 2τ to It is possible to reduce E or to further enhance IllA, thereby obtaining the effect of increasing the recording density in the longitudinal direction of the tape. Although the above embodiment shows the case where the pilot signal is recorded only in the overlap part Ql of FIG. 7, the present invention is not limited to this, and the pilot signal may be recorded in multiple locations in the overlapping parts Ql and Q2. good. Furthermore, instead of recording in these overlap areas Ql and Q2, it may be possible to record in the vertical flanking position of the recorded video signal, and in this case, even if the pilot signal interferes with the video signal, the recording position will not be affected. Since it is a vertical blanking period, it does not appear on the playback screen, which is consistent with the gist of the present invention. Furthermore, in the present invention, the main Gogo to be recorded is not limited to only video signals; for example, when recording any signal such as a PCM Gogo signal obtained by digitalizing a video signal or an audio signal, etc. It can also be applied to Furthermore, in Fig. 5, the wrapping angle of the tape 1 on the disk 2 is set to 1.
The present invention is not limited to this case, but is generally applicable to bean paste manufacturing with any wrapping angle and any number of hands. The recording position of the signal is not limited to the overlapping area; for example, in coloring where the winding angle and number of heads are determined so as not to cause an overlapping area, the main signal is recorded in the longitudinal direction of the track. It can also be applied to cases where recording is performed in a time-division manner so as to separate the recording area from the pilot signal recording area. The effect is the same. [Effects of the Invention] As described above, according to the present invention, it is possible to completely eliminate the restriction on the amount of alignment distortion between adjacent tracks at the track ends, and to reduce the recording area of pilot signals used for tracking control. It is hoped that the tracking error information can be detected in a minimum and maximum amount of time, and that stable and reliable tracking control can be performed.

[Brief explanation of the drawing]

Figures 1, 2, 3, and 4 are conventional track pattern diagrams, Figure 5 is a diagram showing an embodiment of the 1t12 record servo control device according to the present invention, and Figure 6 shows h<l. The waveform diagram of each part, FIG. 7 is a diagram without showing the tape pattern, and FIG. 8 is a diagram showing an embodiment of the tracking control device according to the present invention.
No. 91-1 and FIG. 10 are respective waveform diagrams. 11...Pulse forming circuit. 12.13.14... Delay multi-circuit. 15...Latch circuit. 17...2-phase split circuit. 18.37... Byronto selection, 1! 111th road. ]9...Pilot generation circuit. 31... Circular mantissa conversion circuit. 36...Voltage comparison circuit. Representative Patent Attorney Aki Hashi Akira Shishi, f1 Figure f2 Figure y Figure 3 f4 Figure 6 Figure 1-N Example P P Procedural amendment (method) Description of case Patent Application No. 198766 Name of the invention Name of the patent applicant: L5101 Stock Company 111N Manufacturer's representative Person who amends the recording and reproducing device Subject of amendment: Specification pages 17 to 30 Procedural amendment (voluntary) Amendment Patent applicant's name (5101 material ceremony meeting 1F Hitachi, Ltd. agent) Target of amendment Detailed explanation of the invention in the specification and 1 of the drawings
The following sentence is added between ``distributed arrangement to each'' and ``second'' on page 11, line 5 of the specification. [More specifically, by occupying at least a portion of the parallel diagonal tracks of the magnetic tape, two types of pilot signals having different frequencies are applied to the first portion and the second portion, respectively, to the adjacent tracks at the ends of the tracks. The first portion of each trunk is perpendicular to the first portion of each of the two tracks adjacent to the track, and the first portion of each trunk is perpendicular to the longitudinal direction of the track. The tracks are arranged so that there are no overlapping parts when looking at the direction, and pilot signals of the same frequency are recorded on the second part of each track and the second parts of the two tracks adjacent to it. The first part of each track and the second part adjacent thereto are arranged so that the second parts do not overlap with each other when viewed in the direction perpendicular to the longitudinal direction of the tracks. Pilot signals having different frequencies are recorded in the second portions of the two tracks, and between adjacent tracks, at least a portion of the first portion is more perpendicular to the longitudinal direction of the trunk than at least a portion of the second portion. When viewed in the same direction as the above, it is arranged so that it is close to the scanning start end of each track. 2. Figure 11 of the attached drawings is added after Figure 10 of the drawings. 3. The following sentence is added between lines 5 and 6 on page 28 of the specification. "Based on the above, the track pattern recorded and formed on the magnetic tape 1 is shown in FIG. 11. This FIG.
The case where a time τ smaller than τ is recorded is shown. In Fig. 11 (al is track AI, A2,...K
Pilot signal f. and fl are recorded on tracks B,,B
, . . . is a pattern diagram obtained by recording pilot signals f0 and f. Same <(b) is trunk A,
, A, , record the pilot signals f0 and fl,
Trunk B,,B,. ... is a pattern diagram obtained by recording the pilot signal weight and pilot signal f with different frequencies of the pilot signal f with respect to the pattern of (al). , A, , K pilot signals f. and f are recorded, and track B, , B, ,...
・For the above tbl pattern, the pilot signal f'
. FIG. 3 is a pattern diagram obtained by recording a pilot signal f, which has the same frequency as the pilot signal f. Similarly to FIG. 7, the pilot signal (fo or r'o) recorded in the first part of each track and the pilot signal (fo or r'o) recorded in the second part of each track are shown in FIG.
f+ or f,), and two types of pilot signals having different frequencies are recorded for each track. The effect obtained in any case shown in FIG. 11 is the same, and is consistent with the gist of the present invention. ” 4. “It is a waveform diagram.” in the 11th line of the 30th line of Mei a Homare [
The waveform diagram, FIG. 11, is a diagram showing the pattern of tracks recorded and formed on the magnetic tape. ” is corrected. that's all

Claims (1)

[Claims] 1. Pilot signals j'=, fl, which are recorded together with the main signal to be recorded in the longitudinal direction of a track formed at a predetermined angle on a magnetic tape by a rotary head, having mutually different frequencies; f2, and the first track is provided with the pilot signal in relation to the amount of misalignment between adjacent tracks at the end of the track, which is determined by the rotational speed of the rotary head and the running speed of the magnetic tape. The signal fO and the pilot signal f1 are placed in the order of the second track, and the pilot signal f= and the pilot signal f2 are placed in the order of the pilot signal f= and the pilot signal f2 in at least a part of the longitudinal direction of the track, and these first
And the second track is recorded alternately.
A magnetic recording and reproducing device. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein a recording area for each of the pilot signals and a recording area for the main signal are separated in the longitudinal direction of the track. (b) The magnetic recording according to claim 1, wherein the main signal is a video signal, and each pilot signal is recorded in a vertical blanking portion of the video signal in the longitudinal direction of the track. playback device. 4. Means for generating local pilot signals f1', f2' having the same frequencies as the pilot signals f', f2, respectively, and generating the pilot signals reproduced from the track based on the local pilot signals f', /, and /; A magnetic recording and reproducing apparatus according to any one of claims 1m, 2 and 3, characterized in that tracking is controlled by a detection signal obtained by frequency conversion.