JPS60119654A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain stable tracking control by arranging a pilot signal to detect a tracking error amount and a pilot signal to detect its location dispersedly relating to the shift amount so as not to be overlapped mutually. CONSTITUTION:When a magnetic head 4b scans a track B1 where pilot signals f0, f2 are recorded, a filter 32 extracts only f1-f2 components and the output is subject to envelope detection by a detection circuit 33. Only an output based on the pilot signal f1 from both adjacent tracks A1, A2 is detected for a period of 2tau while being shifted by 2tau each mutually as shown in x, y in Fig. (b). An output from a filter 38 is subject to envelope detection by a detection circuit 39, and an output Z based on the pilot signal f0 from the main track B1 and outputs U, V based on the pilot signal f0 from both adjacent tracks A1, A2 as shown in Fig. (a) are detected respectively for a period of tau. Thus, only the required component is detected with high S/N.

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to a rotating head type magnetic recording/reproducing device, particularly to a device suitable for tracking control. [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 recorded on the magnetic tape. A method is generally used in which the rotational 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 this control signal, the relative positional relationship between the controller/l/head that records and reproduces the control signal and the rotary head must be constant for each device, and if this differs, tracking may not be accurate. This has caused problems such as the difficulty of compatible playback and the loss of reliability of the device. In order to improve this, instead of using the conventional control signal, a so-called pilot signal is used to frequency-multiplex the signal to be recorded, such as a full video signal, and record the pilot signal, which is reproduced from both adjacent tracks during playback. Some methods have been proposed for tracking control by controlling the tape speed so that the amounts of crosstalk are approximately equal. One frequency and two frequencies are used as this pilot signal. A method is known in which tracking is controlled by applying three or four frequencies. As a method using a single-frequency pilot signal, for example, as described in the literature (Japanese Patent Publication No. 56-20621), the pilot signal is tracked between tracks whose recording positions are adjacent to each other, as shown in Figure 1. A method is known in which a plurality of tracks are recorded in the longitudinal direction so that they are not adjacent to each other in the direction orthogonal to the longitudinal direction of the track. This first
In the figure, if the horizontal scanning unit of a Hi video signal is assumed, the H deviation amount between adjacent tracks at the track end is 15H, and each track is If all pilot signals are recorded in the positions shown in the shaded areas of A and H, and the head scans, for example, track B1t in the same figure, during playback,
Based on the reproduction of pilot b11, one adjacent track A
The amount of crosstalk of the pilot a21 reproduced from 2 and the pilot a1 reproduced from the other adjacent track A1
Tracking control is performed so that the crosstalk amounts of both tracks are equal, and when the head scans the next track A2, one adjacent track is detected based on the reproduction of pylon a22. Track B2
The amount of crosstalk of the pilot b2t reproduced from B1 and the pilot b1s reproduced from the other adjacent track B1
The amount of crosstalk between the two is detected, and tracking control is performed so that the amount of crosstalk between the two becomes equal. In the conventional example shown in Fig. 1, the basic condition is that adjacent tracks are lined up in H, and it is necessary to obtain tracking error information at least once from the scanning start point of each track (the point indicated by S in the figure). The required pilot signal recording period TA is:
As is clear from the above explanation of the operation, it is maximum when scanning track A2, and is given by the following equation. TA"-7,51 (...(1) Also, the period TE during which tracking error information can be obtained per detection is given by the following formula. TE = 1.0 H-(2) In this figure 1. In the conventional example, as is clear from the above, tracking error information is detected from both adjacent tracks each time each track is scanned. Tracks A and B are exactly the same (i.e., each track has the same tracking error information from both adjacent tracks). Since the timing at which tracking error information is detected is the same for tracks A and B (i.e., crosstalk is detected and then crosstalk is detected from the upper track), it is in a so-called reverse tracking state (i.e., when the head is recording There is a problem of stabilization when scanning a different track than when scanning a different track, and in order to prevent this, some kind of countermeasure such as identifying whether the track is A or B is required.Next, the two-frequency As a method using pilot signals,
For example, as described in the literature (Japanese Unexamined Patent Publication No. 54-3507), a two-frequency pilot signal fl as shown in FIG.
A method is known in which recording is performed by alternately arranging +h by 2H in the longitudinal direction of the track and by 1H alternately between adjacent tracks. In FIG. 2, the amount of H deviation at the track end is 1.51 (as in FIG. A pilot signal fl is recorded at the shaded positions of tracks A and H, and a pilot signal f2 is recorded at the blank position.For example, when the head scans track B1 in the figure during playback, b And based on the reproduced pilot f2 from C, the crosstalk amount of the pilot fs reproduced from a of one adjacent track A1 and the crosstalk amount of the pilot fl reproduced from d of the other adjacent track A2 are detected, and both are equal. When the head scans the next track A2, the crosstalk amount of the pilot f2 reproduced from C of the adjacent track B1 and the adjacent Byron) fz (played from f of track B2) crosstalk amount is detected and both are equal.

Tracking is controlled so that [-]. In the conventional example shown in Fig. 2 above, the basic condition is that adjacent tracks be arranged in H order as in Fig. 1 above, and it is necessary to obtain tracking error information at least once from the scanning start point of each track. pilot signal recording period T
A is maximum when scanning track B1, and is given by the following equation. TA = &OH (3) Moreover, the period Tg during which tracking error information is obtained per detection is given by the following equation. TE=1. D H...(4) In the conventional example shown in FIG. 2, two-frequency pilots (ft+f2) are recorded alternately on each track, so as for track A, focus is placed on the pilot f2 from the adjacent track, as explained above. However, even if track B is differentiated by focusing on the pilot f1 from the adjacent track, it is not possible to identify whether the currently scanned track is A or B, and the track B is in a reverse tracking state as in the conventional example shown in FIG. There is a problem with stabilization, and some kind of countermeasure is required in this case as well. Next, as a method using three-frequency pilot signals,
For example, as described in the literature (Japanese Patent Publication No. 56-20622), a method is known in which pilot signals of five frequencies fl+fz*fs are sequentially and cyclically recorded every three tracks in the order shown in FIG. 3. be. In addition, as a method using a four-frequency pilot signal, for example, there is a literature
-116120) iAs shown in FIG.
fg*f3. A method of sequentially and cyclically recording continuously in the order of f4 is known. 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 all of the conventional examples shown in Figures 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 causes beat interference, etc. If the main signal that generates spurious signals or is to be recorded is a digitally encoded PCM signal, there is an inherent problem such as a code error occurring due to the mixing of this pilot signal, so it is necessary to reduce this effect. Therefore, the recording level of the pilot signal must be made sufficiently lower than that of the main signal, and the recording band of the main signal must be narrowed.As a result, the recording density of the main signal is substantially reduced, and the S/ N becomes insufficient and it becomes difficult to perform stable tracking control.
Improve tracking accuracy by detecting tracking error information in the longitudinal direction of the track, not minutely or continuously.
Furthermore, in the conventional example shown in FIGS. 1 and 2, H between adjacent tracks cannot be fully utilized.
Since it is necessary to ensure that all magnetic recording devices are lined up, there is a problem that poses a major constraint on magnetic recording and reproducing devices. [Object of the Invention] An object of the present invention is to solve the above-mentioned prior art, eliminate the need for any restrictions such as H alignment between adjacent tracks, minimize the recording area of pilot signals used for tracking control, and Sufficient S without interfering with the recording main signal
An object of the present invention is to provide a magnetic recording/reproducing device that can perform stable tracking control by obtaining /N. [Summary of the Invention] The present invention combines a pilot signal for detecting a tracking error amount and a pilot signal for detecting its location in relation to misalignment leaves between adjacent tracks at track ends. By distributing the recording positions of pilot signals so that they do not overlap between adjacent tracks in a direction perpendicular to the longitudinal direction of the track, maximum tracking can be achieved in terms of time with a minimum recording area. The error information can be detected with good S/N without mutual interference between pilot signals, and the recording area is partially occupied in the longitudinal direction of the track so that a sufficient recording level of the pilot signal can be obtained. This is characterized in that a sufficient S/N ratio can be obtained. [Examples of the Invention] The present invention will now 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, FIG. 6 is a waveform diagram of each part for explaining its operation, and FIG. 7 8 is a diagram showing an example of the tracking control device during playback, and FIG. 9 is a waveform diagram of various parts for explaining its operation. In FIG. 5, the magnetic tape 1 is connected to the capstan motor 2.
The capstan motor 20 is rotated at a constant speed by a capstan servo circuit 21. The magnetic heads 4a and 4b have different azimuth angles, are mounted on the disk 2 at an angle of 180 degrees, and are rotated together with the disk 2 by a disk motor 6. The tape 1 is wound by the disk 2 in a strip from 180°, so that so-called overlap portions shown in FIG. 7, Ql and Q2, are formed at the portions where the magnetic heads 4a and 4b are simultaneously in contact with each other on the tape 1, that is, on the tracks. be done. Two magnets 5a5b are attached to the disk 2 at an angle of 180° to each other, and the tack head 7 detects this and sends a pulse A (a in Fig. 6) to the tack in synchronization with the rotation of the magnetic head 4a4b. Obtained from 7. The pulse A from this tack head 7 is sent to the magnetic head 4a by a phase adjustment circuit 8.
, 4b and the tape 1 are phase-adjusted so that they have a predetermined relative positional relationship, and then the output is supplied to the pulse forming circuit 9. From this pulse forming circuit 9, a magnetic head 4a,
Pulse B (with a duty ratio of 50 voices synchronized with the rotation of 4b)
b) in FIG. 6 is output. Reference numeral 10 denotes a delay multi-circuit, which is triggered by both the rising and falling edges of the pulse B from the pulse forming circuit 9 and outputs a pulse C (C in FIG. 6) having a width of a predetermined time τ0. The value of τ0 is arbitrary, but here, τ0=
It is set so that τ stops. In the delay multi-circuit 11,
Triggered by the fall of pulse C from this circuit 10, a pulse D (d in FIG. 6) having a width of a predetermined time τ1 is output. Here, the value of τ1 is determined to be equal to the value of τ (τl=τ). In addition, in the delay multi-circuit 12,
Triggered by the falling edge of pulse D from this circuit 11, pulse E (e in FIG. 6) having a width of a predetermined time τ2 is output. The value of τ2 is determined so that τ2=2τ. Further, in the delay multi-circuit 13, the pulse E from the circuit 12 is
A pulse F(
f) in FIG. 6 is output. Here, the value of τ3 is τ3=2
1. In addition, the delay multi-circuit 14
, a pulse G (g in FIG. 6) having a width of a predetermined time τ4 is output triggered by the fall of the pulse F from the circuit 1. Although the value of τ4 is arbitrary, it is determined here to be τ4−τ. Furthermore, the delay multi-circuit 15 is triggered by the falling edge of the pulse G from the circuit 14, and outputs a pulse H (h in FIG. 6) having a width of a predetermined time τ5. 16 is a latch circuit, in which the pulse B from the circuit 9 is latched at the falling edge of the pulse H from the circuit 15, and therefore the pulse B from the circuit 9 is
The pulse ■ (i in FIG. 6) delayed by 4+τ5) is output from the circuit 16. The pulse (2) from this circuit 16 is supplied to one side of the disk servo circuit 17, and to the other side, a vertical synchronization signal of the frame period of the power video signal No. 1 to be recorded is supplied to the terminal 10 as a reference signal for the disk servo system during recording.
Supplied from 0. In this disk servo circuit 17, the pulse I from the circuit 16 and the reference signal from the terminal 100 are phase-compared, and a phase difference signal corresponding to the phase difference between the two is output to the circuit 1.
7 and supplied to the disk motor 6. For this reason, servo control is performed so that the pulse (2) is phase-synchronized with the reference signal, and the magnetic heads 4a, 4b are rotated at a rotation speed equal to the frame frequency. Reference numeral 60 denotes a video signal processing circuit, into which a video signal to be recorded is inputted from a terminal 200a, processed appropriately in the circuit 30, and then processed based on the servo control described above.
．． b allows recording to be completed densely on tracks A and B in FIG. 7, respectively, without guard bands. Next, 18 is a two-phase dividing circuit, in which the pulse F from the circuit 13 is divided into two phases by the pulse B from the circuit 9, and during the period when the pulse B is 1H", the pulse J (j in FIG. 6) is
During the period when pulse B is 'L', pulse K (k in Figure 6) is output.It is a 25-digit pilot generation circuit and generates three pilot signals fo, f++ f2'e.The frequency of each of these pilot signals is are magnetic heads 4a, 4
The azimuth loss is determined to be relatively small with respect to the azimuth angle b, the frequencies of the pilot signals f1 and f2 are different from each other, and the frequency of the pilot signal fO is determined arbitrarily. o 26 is a blanking signal generation circuit. and each of the above pilot signals fo, fl+f
2 generates a blanking signal fB with a different frequency,
Here, as an example, a frequency is given at which the azimuth loss becomes sufficiently large with respect to the azimuth angle of the magnetic heads 4a and 4b. Reference numeral 19 denotes a selection circuit, in which the pilot signal fo from the circuit 25 is selected for a period of its pulse width τ1 (=τ) by the pulse D from the circuit 11, and the pilot signal fo from the circuit 25 is selected by the pulse J from the circuit 18 for a period of its pulse width τ1 (=τ). The pilot signal f1 is selected for a period of 2τ), and the pilot signal f2 is selected by the pulse K from the circuit 18 for a period of its pulse width τ3 (=2τ). Further, in this selection circuit 19, the blanking signal fB from the circuit 26 is selected by the pulse C1 from the circuit 10, the pulse E from the circuit 12, and the pulse G from the circuit 14 for a period of each pulse width. These selected pilot signals and blanking signals are arranged in chronological order and output as shown in FIG.
), during the period when pulse B is ``H'', the pilot signal fo + fl is in order, and during the period when pulse B is ``L'', the pilot signal is fO. The output signal from this circuit 19 is outputted in a burst form with fB inserted.
0 recorded in the area shown in FIG. 7, the amount of misalignment between adjacent tracks at the track end (τ in the figure) depends on the running speed of the tape 1 and the rotational speed of the magnetic heads 4a, 4b. The amount of time for scanning by the magnetic head is determined by τ. On the other hand, as described in FIG. 6, the pilot signal fQ is recorded for a time equal to the amount of misalignment τ, and the pilot signal
and f2 are recorded for two times following the pilot signal fO after a time 2τ equal to twice the above-mentioned misalignment time. Therefore, as shown in FIG. 7, the recording start point of the pilot signal f1 or f2 on the track coincides with the recording end point of the pilot signal fo on the subsequent adjacent track, and the pilot signal f+ or f2
The recording end point coincides with the recording start point of the pilot signal f1 or f2 on the subsequent adjacent track, respectively. As is clear from the pattern in FIG. 7, even though the recording positions of pilot signals f1 and f2 partially overlap between adjacent tracks in the direction perpendicular to the longitudinal direction of the tracks, pilot signal f + comrade or pilot signal f2 The recording position of the pilot signal fo (in the direction perpendicular to the longitudinal direction of the track with respect to the recording position of the pilot signal f1 or f2) does not overlap between adjacent tracks, and Tracks do not overlap each other, and pilot signals fO do not overlap between adjacent or adjacent tracks. Figure 8 shows an example of a tracking control device during playback using the above pilot signals. 9, and its operation will be explained using the waveform diagram in FIG. 9.The servo control device during playback is particularly shown in FIGS. During playback, circuits 18, 19, and 26 are not used, and a predetermined reference signal with a frame frequency is input to the terminal 100 instead of a vertical synchronization signal with a frame period. In particular, a tracking error signal from a tracking control device shown in FIG.
The only difference is that the video signal and pilot signal reproduced from the magnetic tape 1 by the magnetic heads 4a and 4b are processed appropriately and the reproduced video signal is output to the terminal 200b and the reproduced pilot signal is output to the terminal 200c. All are the same. Therefore, regarding the operation shown in FIG. 8, since the reference signal of 7 lem frequency is input to the terminal 100 during playback, the pulse I from the circuit 16 is input as described above. The magnetic heads 4PL and 4b are servo-controlled to be phase-synchronized with the reference signal, and rotated at a rotational speed equal to the same frame frequency as during recording. magnetic head 4a
The signals alternately reproduced from tape 1 by circuit 4b are connected to circuit 3.
After being sufficiently amplified at 0, the video signal and the pilot signal are separated and a reproduced pilot signal is output to the terminal 200c. In FIG. 8, 25 is a pilot generation circuit;
They are given the same reference numerals because they can be the same as those in the figure. S7
is a pilot selection circuit, one of which receives the pilot signals fl and f2 from the pilot generation circuit 25, and the other receives the pulse B from the pulse forming circuit 9 shown in FIG. input via In this pilot selection circuit 57, during the period when the magnetic head 4a scans the tape and the pulse B is 1H", that is, during the period when the pilot signal fl was selected during recording, the pilot signal fl is selected as well. Also, the magnetic head 4b
In the period in which the pulse B scans the tape and the pulse B is 'L'', that is, in the period in which the pilot signal f2 was selected during recording, the pilot signal f2 is selected as well, and in any of these cases, at least The pilot signal fl+f2 is selectively output during the scanning period of the pilot region P, and no pilot signal is output during other periods.The output from this circuit 57 is supplied to one side of the frequency conversion circuit 31 as a local pilot signal. The other side of the frequency conversion circuit 31 is supplied with the regenerated pilot signal from the terminal 200c in FIG. The frequency is converted by the signal □, and the difference frequency component between the two is output from the circuit 31. In FIG. When the recorded track B1 is scanned (the waveforms of each part of FIG. 8 at this time are shown in FIG. 9 (i)), pilot signals fo and f2 are reproduced from the main track B1 in the pilot area P. .Furthermore, pilot signals fO and fl are sent from both adjacent tracks A1 and A2.
is detected as crosstalk. As is clear from the pattern in FIG. 7, the crosstalk from these two adjacent tracks is detected at different timings, and each has a 2τ
Since they are detected with a time lag of , the two do not overlap in time. On the other hand, as described above, the magnetic head 4b
During the scanning period, the local pilot signal f is output from the circuit 37.
2 is output, and the reproduced pilot signals from the main track and both adjacent tracks are frequency-converted by the local pilot signal f2 in the circuit 61.
1 outputs the fo-f2 component and f1 to f2 components as difference frequency components. Of these two components, only the f l-f 2 component is extracted by the filter 32, and its output is subjected to envelope detection in the detection circuit 36. Note that the difference frequency between the pilot signal f2 of the main track B1 and the local pilot signal f2 is zero, so the detection circuit 3! It is never detected from I. Further, as described above, since the recording position of the pilot signal fO does not overlap in the direction orthogonal to the longitudinal direction of the track with respect to the recording position of the pilot signals fi and f2, the recording position of the pilot signal fO does not overlap between adjacent and adjacent tracks. Since the two components (fo=f2) and (f+~fz) from are never detected temporally coincident, only the component (fl~fz) can be detected as s/ without unnecessary components being mixed in. It is possible to detect N well. From this detection circuit 33, only the output based on the pilot signal f1 from both adjacent tracks A1 and A2 is detected for a period of 2τ with a time difference of 2T from each other as shown in FIG. The output from the detection circuit 36 contains only crosstalk components from both adjacent tracks, and its output levels X and y correspond to the amount of tracking error. If it shifts to the A1 side, the detection level , the above relationship is exactly the opposite. Therefore, by comparing these two detection levels X and yk, it is possible to detect the amount of tracking error and the polarity of the deviation. The output from this circuit 66 is supplied to one of sample and hold circuits 34 and 35. Next, 38 is a filter for extracting the pilot signal foe from the reproduced pilot signal from the terminal 60, and the output from this filter 38 is subjected to envelope detection in a detection circuit 39. From this detection circuit 39, as shown in FIG. Detected for a period of τ. Also in this case, since pilot signals f1 and f2 are not detected simultaneously, only the pilot signal fO component can be detected with a good S/N. The output from the detection circuit 39 is pulse-shaped by a pulse shaping circuit 40 using an appropriate threshold value, and a pulse (C in FIG. 9) related to the output 2 based on the pilot signal fo of the main track is generated.
is output. 41 is a delay multi-circuit having a delay time of 6τ or more, and is triggered by the rising edge of the pulse from the circuit 40. Since the delay time is set to 6τ or more, for example, even if the pilot signal fo is mistakenly detected in connection with the reproduction of the pilot signal f1 or f2, it will be inhibited and no malfunction will occur. In other words, the frequency of the pilot signal fO may be set to the same frequency as the pilot signal f1 or f2, and generally any frequency can be selected. The output pulse from this circuit 41 (d in FIG. 9) is output from the sampling pulse generation circuit 42.
are supplied with two sampling pulses SP1 and SF3
is generated. First sampling pulse 5P1 (9th
The signal e) in the figure is generated with a phase delayed by 2τ from the rise of the pulse from the circuit 41 so that the pulse width is 2τ or less. Further, the second sampling pulse SP2 (f in FIG. 9) is generated by delaying the first sampling pulse by approximately 2τ. This first sampling pulse sP1 is supplied as a sampling pulse to the circuit 34, so that the circuit 34 outputs an error voltage based on the tracking error from one adjacent track (A1). It is supplied as a sampling pulse to the circuit 65, and therefore the circuit 35 outputs an error voltage based on the tracking error from the other adjacent track (A2). The error voltages from these circuits 34 and 35 are compared in a voltage comparator circuit 36, and the output is output from a terminal 8 as a tracking error signal.
The signal is supplied to the terminal 22 of the capstan servo circuit 21 shown in FIG. The above operation is the same when the next main track A2 following the main track B1 is scanned by the magnetic head 4a having the same azimuth angle. In this case, the local pilot signal f+ is selected from the circuit 67. The only difference is that everything else is the same, and the waveforms of each part are the same as above. Through the above operations, the tape speed is controlled and tracking control is performed so that the crosstalk amounts of the pilot signals from both adjacent trunks are equal to each other, that is, the center of the king track is scanned. Next, waveforms tl at various parts in FIG. 8 and (i) in FIG. 9 show a state of reverse dragging, for example, when the magnetic head 4a scans a track B1f different from that recorded. In this case, fl is selected as the local pilot signal and the pilot signal f is selected. and f2 are recorded, and therefore sampling pulses SP1 and SP2 (e and f in FIG. 9) are generated by the output 2 from the circuit 39 based on the pilot signal fo from the currently scanned track B1. generated. On the other hand, from the circuit 36, components f1 to f2 based on the pilot signal f2 from the current scanning track B1 (see FIG.
if) W) of b is detected and both adjacent tracks AI, A
Tracking error information based on the two-piece pilot signal f+ is not detected. Therefore, as is clear from the waveforms in FIG. 9(ii), the output voltage from the circuit 34 and the circuit 65
The output voltages from the circuit 36 do not match and are unbalanced with each other, and the circuit 36 outputs a large error voltage. As is clear from this, the system is not stabilized in the reverse tracking state, and in the reverse tracking state, a thick table error signal is obtained, which acts to return the system to the normal tracking state. This has the effect of reducing time. The above-mentioned effect is obtained by alternately switching the local pilot signals f] and 12 corresponding to the scanning of the magnetic head, which is one of the points of focus of the present invention.In other words, this enables track identification. is done automatically. Note that the blanking signal fB recorded before and after the pilot signal fO and the pilot signal fl or f2 (in the shaded area in Fig. 7) is not directly related to the detection of tracking error information, but is When a head wider than the track pitch is used for 4a and 4b, it is used to erase pilot signals recorded over adjacent tracks, or to erase unnecessary signals that have already been recorded. This allows the desired pilot signal to be
The effect of N good detection can be obtained. Through the above tracking control, the video signals which are alternately reproduced by the magnetic heads 4a and 4b in the recording area V of the video signal shown in FIG. , one continuous reproduced video signal is output to the terminal 200b, and the reproduced pilot signal is not mixed into this reproduced video signal. As is clear from the above, the pilot signal recorded in the overlap part Q1 in FIG. A reproduced pilot signal can be obtained and stable tracking control can be performed. Further, the present invention arranges the pilot signal in relation to the amount of misalignment τ between adjacent tracks at the end of the track, and the amount of misalignment τ can be arbitrarily set.
Unlike the conventional example described above, there is no restriction due to this. Furthermore, by arranging it in relation to the misaligned cover τ, it is possible to reduce the recording area of the pilot signal and obtain the maximum amount of tracking error information in terms of time. In order to compare this with the previous known example, if the above alignment deviation amount τ is set to τ = 1.5H, the recording period TA of the pilot signal necessary to obtain at least one tracking error information is given by the following equation. . TA=5τ=15H (5) Furthermore, the period TE during which tracking error information is obtained per detection is given by the following equation. Tg=2τ=5.0H (6) As is clear from comparing the above equations (5) and (6) with the previous equations (1) to (4), according to the present invention, TA? It can be seen that TE can be maximized without increasing it. In particular, making the TI thicker means that more tracking error information can be detected over time, and a temporal integration effect can also be obtained, resulting in more accurate and stable tracking control. As is clear from the above explanation of the operation, the first feature of the present invention is to track the pilot signals (h and fz) for detecting the amount of tracking error and the pilot signal (fo) for detecting the location thereof. In relation to the misalignment amount (τ) between adjacent tracks at the end, the recording positions of both pilot signals are arranged so that adjacent and adjacent tracks do not overlap in a direction orthogonal to the longitudinal direction of the track. By doing so, these two pilot signals can be detected well without mutual interference. Also,
The second feature of the present invention is that the pilot signals (pilot signal f + pilot signal or pilot signal f2) for tracking error amount detection are arranged so that they do not overlap between adjacent tracks in a direction perpendicular to the longitudinal direction of the tracks. In addition, a pilot signal (fo
) are also arranged so that they do not overlap between adjacent and adjacent tracks, each of these pilot signals (fo+
f+, fz)' can be detected with good SA without self-interference. Accordingly, FIG. 10 shows a track pattern diagram based on another embodiment other than the embodiment shown in FIG. 7 in keeping with the gist of the present invention. FIG. 10(i) shows the respective delay times τl, τ2, and 73 of circuits 11, 12, and 15 in FIG. 5 as τ1×τ, τ2〉
The track pattern obtained as 2ττ3<2τ is shown. FIG. 10(ii) shows a track pattern obtained by alternately switching the delay time τ2 of the circuit 12 of FIG. 5 to τ2-2 for track A and τ2=5τ for track B. In particular, according to the embodiment shown in FIG. 10 (+i), the recording positions of the pilot signals f1 and fz differ from track to track and do not overlap between adjacent tracks, so that the frequencies of the pilot signals f1 and fz can be changed. Even if they are the same, the amount of tracking error can be detected correctly, and furthermore, as mentioned above, the frequency of the pilot signal fO can be arbitrarily selected, so these pilot signals fO+fl+f
You can obtain the effect of making all 2 the same. In this case, tracks can be automatically identified by utilizing the property that the timing at which the pilot signals f+ and fz are reproduced differs from track to track based on the pilot signal fo'. Although the above embodiment shows the case where the pilot signal is recorded only in the overlap part Q1 of FIG. 7, the present invention is not limited to this, and the pilot signal may be recorded also in the overlap part Q2 of FIG. These overlap portions Q1. Q2D may be recorded at multiple locations. Also, instead of recording in these overlap areas Qs and Q2, it may be possible to record in the vertical blanking 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 change. Since it is a vertical blanking period, it does not appear on the playback screen, which is the gist of the present invention. Furthermore, the present invention is not limited to a video signal as the main signal to be recorded, but can also be applied to the case of recording any other signal such as a PCM signal obtained by digitizing a video signal or an audio signal. It is possible. Furthermore, although Fig. 5 shows the case where two heads are used with the winding angle of tape 1 (Df disk 2) being 180°, this is not limiting, and in general, the tape can be configured with any winding angle and any number of heads. In addition, the recording position of the pilot signal is not limited to the overlap area; for example, in a device configured so that no overlap area occurs, the recording area of the main signal is in the longitudinal direction of the track. It can also be applied to time-division recording to separate the pilot signal recording area from the pilot signal recording area.Also, the pilot signal may be recorded directly, or the main signal may be used as a bias or the main signal may be recorded as a bias. It is also possible to record a signal different from the signal as a bias. In any of the above cases, the gist of the present invention is not deviated from and the effect obtained is the same. [Effects of the Invention] As described above. As described above, according to the present invention, it is possible to eliminate any restriction on the amount of misalignment between adjacent tracks at the end of the track, and it is possible to eliminate interference with the main signal of the pilot signal used for tracking control. To minimize a signal recording area, to be able to detect temporally maximum tracking difference information to S, and to perform stable and reliable tracking control by automatically performing track identification. Effects such as being able to do this can be obtained.

[Brief explanation of the drawing]

1, 2, 3, and 4 are track pattern diagrams of a conventional magnetic recording/reproducing device, and FIG. 5 is a block diagram showing an embodiment of the servo control device of the magnetic recording/reproducing device of the present invention. 6 is a waveform diagram of each part thereof, FIG. 7 is a track pattern diagram thereof, FIG. 8 is a block diagram showing an embodiment of the tracking control device according to the present invention, FIG. 9 is a waveform diagram of each part thereof, and FIG. The figure is a track pattern diagram based on another embodiment. 9...Pulse forming circuit 10, 11.12.15.14.15...Delay multi circuit 16...Latch circuit 18...2 phase division circuit 1
9... Selection circuit 25... Pilot generation circuit 26... Blanking signal generation circuit 61... Frequency conversion circuit Liu 1 Figure 2 Figure 3 Whisper 3 Figure 4 Procedural amendment (voluntary) Incident display 1981 Patent Application No. 226'g15 Name of the invention
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Claims (1)

[Scope of Claims] 1. The first . means for generating second and third pilot signals, the second and third pilot signals being generated in relation to the amount of misalignment between adjacent tracks at the track ends, which is determined by the rotational speed of the rotary head and the running speed of the magnetic tape; The first pilot signal and the second pilot signal are placed in the order of the first pilot signal on the first track, and the first pilot signal and the third pilot signal are placed on the second track in the order of the first pilot signal and the third pilot signal in the order of the first pilot signal and the third pilot signal, respectively, at the least longitudinal direction of the track. The first and second tracks are alternately recorded, and the recording position of the first pilot signal is adjacent to the recording position of the second and third pilot signals in a direction orthogonal to the longitudinal direction of the track. and a magnetic recording/reproducing apparatus characterized in that recording is performed between adjacent tracks so that they do not overlap with each other. 2. The recording position of the fifth pilot signal is recorded so that the recording position of the fifth pilot signal does not overlap between adjacent tracks in a direction orthogonal to the longitudinal direction of the track with respect to the recording position of the second pilot signal. A magnetic recording and reproducing apparatus according to claim 1. 3. Claim 2, characterized in that the frequencies of the second and third pilot signals are the same.
Magnetic recording and reproducing apparatus described in Section i. 4. The first pilot signal and the second or third pilot signal.
The middle of the pilot signal recording area or the area before and after these areas ζ, 1st, 2nd, . Claim 1 or 2, characterized in that a blanking signal of a frequency different from that of the third pilot signal is recorded.
6. The magnetic recording and reproducing device according to any one of item 6 and item 6.