JPH07105522A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable attaining the mounting of high density by making a tracking signal different from a position where information are recorded and reproduced and providing at least pilot signal parts more than two parts. CONSTITUTION:Data transmitted from a higher rank position are subjected to shufflings for dispersing recording oders and added with error correcting data and subjected to channel codings in a recording circuit 901 and then transferred into the inside a drum 2 via recording amplifiers to be recorded on the drum 2. Heads 221a, 221b, 222a, and 222b are used for recording heads. In reproducings, outputs of reproducing heads 211a, 211b, 212a and 212b are amplified by pre-amplifiers then restored through reproducing amplifiers and decoders in a reproducing circuit 902 via the rotary transformer in the drum 2. In such a manner, a tracking control is made possible without using a fixed head and a recording and reproducing device is made at a low cost and the size of an ATF part is made small by using small kinds of frequencies and the mounting of high density is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tracking of a helical scan type recording / reproducing apparatus.

[0002]

2. Description of the Related Art In a system for recording and reproducing a signal on an oblique track on a magnetic tape by using a rotary magnetic head, the rotary magnetic head must be properly traced without leaving the track during reproduction. (Tracking control) is required.

As a conventional tracking control method, V
Some are adopted in HS type VTRs (VHS
Is the trade name of Victor Company of Japan, see FIG. That is,
A dedicated fixed head different from the rotary head is provided on the tape traveling path, and a linear track area for writing a tracking control signal near the upper or lower end of the magnetic tape and in the longitudinal direction of the magnetic tape. The CTL system in which (81) is set on a magnetic tape, and control pulses are recorded and reproduced in a predetermined plurality of intervals in this linear track area is a good one.

Since recording is performed with a dedicated fixed head, a recording / reproducing circuit for the fixed head is required. The tape drive speed is changed by the difference between the reproduction output pulse and the reference pulse, and the rotary magnetic head is controlled so as to be accurately traced on an oblique track.

There is also a method of recording a pilot signal for tracking control using a rotating magnetic head on an oblique track without using a dedicated fixed head.

The tracking control signal recording method is as follows: 1) The information signal and the tracking signal are simultaneously recorded at different frequencies in the information signal writing area adopted in the 8 mm video. There are a simultaneous recording method by multiplexing and 2) an area division method adopted in DAT, in which a tracking control signal is recorded at a position different from an information signal writing area on an oblique track.

The signals used in these pilot systems use signals of a plurality of frequencies, which are lower than the signals for recording information.

In the pilot type tracking,
The tracking error amount is calculated based on the level difference between the pilot signals from both adjacent tracks that are being scanned, and the tape driving means is fed back.

In the above 8 mm video and DAT, positive azimuth and negative azimuth are discriminated, and two tracks are grouped into one frame and this frame is divided into an even frame and an odd frame. In order to discriminate between a frame and an odd frame, that is, to discriminate four tracks, four frequencies are used.

[0010]

In the CTL system, a fixed head can record a signal corresponding to an absolute address such as a time code on the magnetic tape at the same time as a control pulse, so that predetermined information on the magnetic tape can be retrieved at high speed. There are advantages. However, there is a problem that the cost increase due to mounting the fixed head is unavoidable, and the mechanism cannot be downsized because of the fixed head in mounting the mechanism. Further, since the magnetic tape and the magnetic head are directly slid, the running of the magnetic tape becomes unstable, and the magnetic tape is apt to be damaged, which is a reliability problem.

Further, the frequency multiplex pilot system is not suitable for a system requiring high reliability because interference with an information signal occurs due to a recording characteristic of a magnetic tape and a filter characteristic in a reproducing circuit. . Furthermore, it is not suitable for high-speed search.

The area division method can remove the interference of the information signal of the above frequency multiplexing method. However, it is not suitable for high speed search. Also, the conventional method is
Since it is a circulating signal in units of 4 tracks, only 4 tracks can be identified.
It is difficult to perform tracking control capable of identifying all tracks in units of 12 tracks or 24 tracks. For example, it is conceivable to use 12 frequencies in order to carry out tracking control for identifying all 12 tracks, but there is a problem that the frequency filtering accuracy is deteriorated because the circuit scale becomes large and the frequency difference between 12 frequencies becomes small. There is.

[0013]

In a recording / reproducing apparatus for forming oblique tracks on a recording medium, recording information by using a plurality of magnetic heads having different azimuths, and reproducing the information, a part of the tracks is recorded. A tracking signal is recorded, and the tracking signal is composed of a signal group repeated for each first track number of continuous tracks and a signal group repeated for each second track number of continuous tracks. The characteristic recording / reproducing apparatus is used. Alternatively, the tracking signal includes at least a tracking error determination signal portion (hereinafter referred to as a pilot signal portion), a synchronization signal portion for tracking error determination, and a block detection signal portion that is recorded and reproduced for each block including a plurality of tracks. A recording / reproducing apparatus is used which is characterized in that Alternatively, the tracking signal can be realized by using a recording / reproducing device which is different from the position for recording / reproducing information and has at least two pilot signal portions.

Further, in a recording / reproducing apparatus for forming an oblique track on a recording medium, recording information by using a plurality of magnetic heads having different azimuths, and reproducing the information, a tracking signal is applied to a part of the track. This tracking signal is recorded and is composed of at least a pilot signal section and a synchronization signal section for tracking error determination,
And the pilot signal portion and the synchronization signal portion for tracking error discrimination are formed on different tracks,
A recording / reproducing apparatus is used in which a track having the pilot signal portion and a track having the synchronization signal portion for discriminating a tracking error are arranged alternately. Alternatively, a recording / reproducing apparatus is used in which at least 6 or more tracks in one of the tracks are set as one group, and an arbitrary track in the group can be identified by the tracking signal. Alternatively, a recording / reproducing apparatus is used, in which a track having the pilot signal section and a track having the synchronization signal section for discriminating the tracking error are recorded and reproduced substantially at the same time. Also, a recording / reproducing apparatus is provided which is provided with a sync signal of 50 to 500 bytes for synchronizing with an information signal between the tracking signal and an area for recording information. it can. Also, in a recording / reproducing apparatus for forming an oblique track on a recording medium by using a plurality of magnetic heads having different azimuths, recording information, recording a tracking signal on a part of the track, and reproducing the signal. , N (where N is a positive integer) diagonal tracks are divided and recorded collectively, and a drum on which a magnetic head is mounted and 2 × are recorded on the drum.
(M + 1) (where M is a positive integer) heads are arranged and N = I × (2 × (M + 1)) or (2 × (M +
1)) = I × N (I is a positive integer) is used. Alternatively, the 2 × (M + 1) heads arranged on the drum are arranged 180 ° opposite to each other by M + 1, and N = I × (M + 1), or
This can be realized by a recording / reproducing apparatus characterized in that M + 1 = I × N (I is a positive integer).

[0015]

The pilot signal is a pilot signal repeated every first track number Tn1 of continuous tracks,
Since the pilot signal is repeated every second track number Tn2 of continuous tracks, the least common multiple of Tn1 and Tn2 can be identified by the pilot signal. Many tracks can be identified with few frequencies.

By separating the synchronization detecting section and the tracking error determining section, highly reliable detection is possible.

When the tracking control is performed for each track, the controllability is improved. However, the controls and circuits are complex and large. On the other hand, if it is performed for each of a plurality of tracks, the circuit scale becomes smaller, but the controllability deteriorates. However, in a system that records and reproduces two tracks at the same time, for example, the tracking error in the two tracks is equal, and therefore the controllability does not deteriorate even if tracking control is performed for every two tracks.

By forming the pilot signal portion and the synchronization signal portion on different tracks, a tracking signal portion (hereinafter referred to as ATF: Automatic Trac) is formed.
It is possible to reduce the exclusive space in the oblique track direction (called a kFollowing section).

In a system for recording / reproducing information grouped into a plurality of tracks, the head is an integral multiple of the plurality of tracks, or 1 / K times (where K is a positive integer) so that a plurality of tracks can be recorded. Can be easily identified.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a block diagram of the entire system, and FIG. 7 is a block diagram of a servo system that controls the mechanism section. In the recording circuit 901 (FIG. 6), the data sent from the host device is shuffled to disperse the recording order, added with error correction data, channel coded, and recorded with a recording amplifier. It is transmitted and recorded in the through drum 2. The recording heads 221a, 221b, 222
a, 222b (FIG. 5) are used. As shown in FIG. 8, reproduction is performed by the reproduction heads 211a, 211b, and 212.
The outputs of a and 212b are supplied to preamplifiers 251a and 251.
b, 252a, 252b, and then a reproduction amplifier of the reproduction circuit 902 via the rotary transformer 24 in the drum 2.
It is restored through the decoder.

FIG. 2 shows the entire recording pattern recorded on the magnetic tape 1. FIG. 1 shows a tape pattern 1a,
The detailed view of 1b part is shown. On the diagonal track, from the lower end of the magnetic tape 1, the ATF1 part 1a, the preamble 1
b, a data area 1c, a postamble 1d, and an ATF2 section 1e.

The ATF1 section 1a and the ATF2 section 1e are areas in which the synchronizing signal 1aa for auto tracking (FIG. 1) and the pilot signal 1ab are written. The ATF1 portion 1a at the lower end of the track and the ATF2 portion 1e at the upper end are patterns of the same sync signal 1aa and pilot signal 1ab, and tracking control is possible above and below the data area 1c. In the preamble 1b and the postamble 1d, signals indicating the start and end of the data are recorded, respectively.

As shown in FIG. 7, the ATF signal is input to the tracking control system 903 and correct tracking is performed by the cooperative control of the drum 2 and the capstan motor 301.

FIG. 4 shows how the magnetic tape 1 is wound around the drum 2. Further, FIG. 5 shows an arrangement of ten rotary magnetic heads on the drum 2. The magnetic tape 1 is wound around the drum 2 at about 180 ° or less. The effective winding angle is set to 180 ° or less, and the recording circuit 9 of FIG.
01, the recording circuit 901 and the reproducing circuit 902 by switching as shown in the input stage of the reproducing circuit 902.
Can be halved respectively. The recording is azimuth recording having an angle of ± 20 ° with respect to the scanning direction of the rotary magnetic head. Then, the four heads 221a, 221b,
Recording is performed at 222a and 222b, and two heads of positive azimuth and negative azimuth are set as one set, and two sets of heads are arranged on the drum 2 at intervals of about 180 ° (hereinafter, referred to as "opposing arrangement"). ), Positive azimuth, and negative azimuth, and two heads are recorded at substantially the same time. Playback is also 4 heads 2
11a, 211b, 212a, and 212b, and two heads of positive azimuth and negative azimuth having the same azimuth angle as the recording head are set as one set, and two sets of heads are arranged facing each other at about 180 °. , Two negative azimuth heads are set to reproduce at about the same time.

Hereinafter, the positive azimuth head of the recording head will be referred to as a CH0-A head 221a, the negative azimuth head will be referred to as a CH0-B head 221b, and the heads facing each other by 180 ° will be CH1-C heads 222a, CH1. −
It is called a D head 222b. In addition, the CH0-A head 22
1a and CH0-B head 221b are collectively referred to as CH0 head 221, and similarly CH1-C head 222a and CH1-D head 222b are collectively referred to as CH1 head 2
Called 22. The positive azimuth head of the reproducing head is referred to as CH0-A head 211a, the negative azimuth head is referred to as CH0-B head 211b, and the heads facing each other by 180 ° are CH1-C heads 212a and CH1-.
It is called a D head 212b. Also, the CH0-A head 21
1a and CH0-B head 211b are collectively referred to as CH0 head 211, and similarly, CH1-C head 212a and CH1-D head 212b are collectively referred to as CH1 head 2
Call 12. The recording heads 221a, 221b, 2
22a, 222b and reproducing heads 211a, 211b, 2
Different from 12a and 212b. However, the record CH0-
The track recorded by the A head 221a is reproduced by the CH0-A reproducing head 211a. Also, record CH0-
The track recorded by the B head 221b is reproduced by the CH0-B reproduction head 211b. Similarly, record CH1
-The track recorded by the C head 222a is a playback CH.
The track reproduced by the 1-C head 212a and recorded by the recording CH1-D head 222b is reproduced by the reproducing CH1-D head 212b.

The data area 1c (FIG. 2) corresponds to a winding angle of about 162 ° on the drum 2 (FIG. 4), and the ATF 1 section 1a and the preamble 1b and the ATF 2 section 1e and the postamble 1d are about 8. It is equivalent to 1 ° and 8 °.

In this system, the data is divided into a predetermined size and recorded. The signal divided into a predetermined size is added with an error correction signal, and then the error correction capability for a burst error of the signal is enhanced,
Recording is performed by performing a shuffling operation that changes the writing order. The signals divided into a predetermined size are recorded collectively for every 6 tracks. Therefore, recording and reproduction are all performed in units of 6 tracks (hereinafter referred to as "scan group"). In order to record 6 tracks, the drum 2 (Fig. 4) rotates 1.5 times, and the recording CH0 head 221 (Fig. 5), C
H1 head 222 and CH0221 head in this order, or recording CH1 head 222, CH0 head 221, and C
Recording is performed in order of the H1 head 222. Scan glue
The number of tracks is 6 tracks, but the correspondence between each track of the scan group and the head has a periodicity for every 24 tracks. Therefore, by writing a tracking signal that can identify 24 tracks, the correspondence between the tracks and the head can be achieved.

The data area 1c (FIG. 2) is divided into 408 blocks, and one block is used as a sync block. One sync block contains 97 bytes of data.
Although it is composed of data, it has 85 bytes as user data. 8 bytes out of the remaining 12 bytes
For correction, 2 bytes are for synchronization signal 1aa (FIG. 1) and 2 bytes are ID information.

Next, the ATF 1 section 1a and the preamble 1b
Will be described. As described above, the ATF 1 section 1a and the preamble 1b correspond to a drum winding angle of about 8.1 °, which is 1998 bytes. Of the 8.1 °, about 1.8 ° is the preamble 1b, and 6.3 ° is the ATF.
It is 1 part 1a. The preamble 1b part is composed of an unillustrated 146-byte edit gap, a 97-byte track preamble, a 146-byte edit gap, and a 57-byte in-track preamble.

The ATF1 section 1a (FIG. 1) is provided with a synchronization signal 1a.
a, pilot signal 1ab, scan group
It is composed of mosquito 1ac. The ATF1 part 1a is divided into 16 blocks, the physical length of each block is the same as that of the sync block, and the ATF1 part 1a has a length of 16 × 97 bytes.

The synchronization signal 1aa is used to form a signal for synchronization for sampling the pilot signals 1ab written on both adjacent tracks. The pilot signal 1ab is used to calculate the off-track amount according to the magnitude of the reproduction output signal of the pilot signal 1ab written on both sides of a predetermined track.
On the scan group marker 1ac, a signal indicating the start point of the scan group is written. Therefore, record CH
0-A head 221a (FIG. 5) or recording CH1-
The recording is performed every 6 tracks by the C head 222a.

In this embodiment, the synchronization signal 1aa is recorded in positive azimuth and the pilot signal 1ab is recorded in negative azimuth.
The track division recording method is used. Therefore, the detection and reproduction of the pilot signal 1ab is performed by the reproduction CH which is negative azimuth.
This is performed by the 0-A head 211b or the reproducing CH1-C head 212b.

By adopting the track division method,
The ATF area in the longitudinal direction of the track is reduced, and the amount of data is reduced accordingly.
Since the data area 1c can be enlarged, high-density recording is possible. In this method, the tracking control is performed once for every two tracks, and it seems that the tracking performance is deteriorated. However, as described above, since it is the approximately two-track simultaneous recording / reproducing system, the tracking performance is not deteriorated at all. Because the sampling cycle of the tracking error amount is set to 2
This is because the same error amount is obtained for each track because sampling is performed at the same time. That is, since the recording / reproducing system uses about two tracks at the same time, there is little variation in tracking during recording between tracks of positive and negative azimuths recorded at the same time. The effective data amount when sampling the tracking error data for two tracks at the same time is 1
This is because there is no difference from the effective data amount when the tracking error data for the tracks is sampled.

In this embodiment, the write position of the track from the lower edge 1b (FIG. 1) of the magnetic tape 1 of the positive and negative azimuth tracks is different. Negative azimuth truck 11b
Is arranged at a position where the positive azimuth track 11a is moved in the track width direction, the sampling and format of the ATF signal for every two tracks is effective.

In this embodiment, since the same azimuth signal is recorded in a 180 ° opposite arrangement, for example, CH0-A
Signal recorded by head 221a and CH1-C head 22
In order to identify the signal recorded in 2a in the ATF area, the write frequency of the synchronization signal 1aa (FIG. 1) in each head is made different, so-called back track reproduction (other than the reproduction head corresponding to the recorded head). Playback with the head) is prevented.

FIG. 3 shows an example of the reproduction output timing chart of the synchronizing signal 1aa and the pilot signal 1ab and the sampling timing. Each playback head has a sync signal 1a.
After a time T1 corresponding to 3 blocks from the rise of a, the first
The pilot signal 1ab is detected, and after the time T2 corresponding to 6 blocks, the second pilot signal 1ab is detected. Assuming that the respective reproduction outputs are C1 and C2, FIG.
In the reproduction CH0-A head 211a, when C1> C2, the head is behind the predetermined track position, and conversely, when C1 <C2, the head is advanced. On the contrary, in the reproducing CH1-C head 212a of FIG. 3B, when C1> C2, the head is ahead of the predetermined track position, and conversely C1 <C2.
If, then you are late. Tracking is performed based on the difference between these outputs. In this way, the method of discriminating the signal sampled by the reproducing head is changed to determine the tracking method.

Incidentally, when the head crosses the tracks with four tracks displaced at the track start end and the track end, the same head after four tracks is used for recording in order to avoid a so-called pseudo lock phenomenon in which the tracking error amount apparently becomes zero. In the track, the time interval of the sync signal 1aa is changed to serve as a pseudo lock prevention means.

From the ATF pattern described above, the synchronization signal 1a
a and the pilot signal 1ab form a basic pattern with a cycle of 8 tracks. Also, since the scan group marker 1ac is every 6 tracks, it is possible to identify 8 tracks and 24 tracks, which is the least common multiple of 6 tracks.

In the above embodiment, as shown in FIG. 5, the optimum ATF is obtained when four heads are arranged on the drum 2 at intervals of 180 °, that is, two heads are arranged opposite to each other by 180 °. Explaining the pattern. The triple heads shown in FIGS. 9 and 10 will be described below with reference to FIGS.
A system using a total of 6 recording heads and 60 reproducing heads arranged facing each other by 80 °, and a total of 8 recording heads and 8 recording heads in which four continuous heads shown in FIGS. Optimal pattern in a system using a playback head
I will explain. Note that the numerical values enclosed in parentheses in FIGS. 13 to 16 indicate the head numbers of the tracks to be reproduced. In addition, + in the figures of FIGS. 13 to 16 indicates the positive azimuth, and − in the figures indicates the negative azimuth.

FIG. 13 shows an AT when a triple head is used.
It is an F pattern. Track 11 recorded almost simultaneously
1, 112, 113, 114, 115, and 116, the ATF on the central tracks 112 and 115, respectively.
For synchronization signals 1aaa and 1aab are provided. The pilot signals are tracks 111, 113, 114, 11
Written in 6. Therefore, the tracking error determination is performed by using the 251b head and the track 11
The pilot signal amplitudes of 1 and 113 are compared to obtain an error amount, which is fed back to the tracking control system 903 (FIG. 7). Also, using the 252b head, the tracks 114 and 116 are
Similarly, the error amount is obtained by comparing the pilot signals with and, and is fed back to the tracking control system.

The present embodiment is a system for collecting data for every 6 tracks, performing error correction, adding an ID number, and recording as one scan group. Therefore, 3
Since two continuous heads are used to record and reproduce with a total of 6 heads, 1) the matching between the write track and the head is good, 2) the head selection for recording is very simple, and 3) the write ATF. 4) The pattern is simple, and 4) The synchronization timing format for tracking error determination is simple, so that not only can it be constructed at low cost, but the servo pull-in time can be shortened. . Further, in the dual head configuration, by reducing the ATF area, as a result, as shown in FIG. 3, the determination sequence as to whether the head is too advanced or delayed is different for every two tracks. However, in the embodiment shown in FIG.
The discrimination sequence is always constant. That is, a signal sampled after T1 time from the synchronization signals 1aaa and 1aab is C1, and further after T2 time, that is, the synchronization signal 1
Assuming that the signal sampled after T1 + T2 time from aaa and 1aab is C2, if C1> C2, it is always too advanced, and conversely, if C1 <C2, it is always delayed.

Further, the synchronization signals 1aaa, 1aab are 3
This is for each track, and since a certain sync signal and the sync signals on both sides of it are reproduced by heads with different azimuths,
It is possible to prevent the so-called back track reproduction in which the track 112 by the 1b head (FIG. 13) is reproduced by the head 252b. Sync signals 1aaa and 1aa
The track on which b is recorded is the negative azimuth track 11
2. This is because it becomes an alternating signal of the positive azimuth track 115. This is for two kinds of azimuth recording patterns,
This is because the synchronization signal 1aa and the two pilot signals of the tracks on both sides of the synchronization signal 1aa are set as one ATF pattern, and the ATF pattern is repeated for each track.

FIG. 14 shows a modification of the embodiment shown in FIG.
The scan group marker 1ac is deleted.
Even when deleted, the signal time width of the synchronization signal is 1aaa,
The scan groups can be identified by making 1aab and 1aac, 1aad different, that is, different for every 6 track periods.

An AT using a quadruple head is shown in FIGS.
An example of the F pattern will be shown. Using a 4-unit head while controlling the writing timing with an electronic circuit,
It is possible to leave a trace of recording when a continuous head is used.
FIG. 15 shows a pattern in which three tracks, which are two pilot signal tracks and one sync signal track, are sequentially recorded. Since it is a 6-track 1-scan group, the ATF pattern for each 3-track is a scan group.
It is convenient for identifying the group. Further, although the scan group identification signal is recorded in FIG. 15, as in the embodiment of the triple head shown in FIG. 13, the intervals of the synchronization signals are made different to identify the scan group. Is also good.

On the other hand, FIG. 16 shows a pattern in which four tracks are sequentially recorded by two pilot signal tracks, one sync signal track, and one track in which the ATF signal is not written. is there. In the pattern of FIG. 16, the recording pattern is determined for each head, so that the system can be configured with a simple configuration.

13 to 16, the frequencies of the pilot signals are all the same, and the AT
The F2 portion 1e also has substantially the same structure as the ATF1 portion 1a.

[0047]

According to the present invention, tracking control can be performed without using a fixed head, and the cost of the recording / reproducing apparatus can be reduced. Further, since the system records and reproduces the control information collectively for each of a plurality of tracks by using a small number of types of frequencies, the ATF part can be downsized, and high-density mounting is possible.

[Brief description of drawings]

FIG. 1 is a tracking control A according to an embodiment of the present invention.
It is a figure which shows the detail of a TF signal.

FIG. 2 is a tracking control A according to an embodiment of the present invention.
It is a figure which shows the pattern of the tape which recorded the TF signal.

FIG. 3 is a diagram showing tracking error identification timing using a tracking control pilot signal according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which a magnetic tape is wound around a rotary drum in a magnetic recording / reproducing apparatus which is an embodiment of the present invention.

FIG. 5 is a plan view showing an arrangement of magnetic heads on a rotary drum in an embodiment of the present invention.

FIG. 6 is a system configuration diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 7 is a block diagram of a servo system of the magnetic recording / reproducing apparatus in one embodiment of the present invention.

FIG. 8 is a block diagram showing a head configuration and a circuit configuration according to an embodiment of the present invention.

FIG. 9 is a plan view of a base of a magnetic head according to another embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration and a circuit configuration of a magnetic head according to another embodiment of the present invention.

FIG. 11 is a plan view of a base of a magnetic head according to another embodiment of the present invention.

FIG. 12 is a block diagram showing the configuration and circuit configuration of a magnetic head according to another embodiment of the present invention.

FIG. 13 is a diagram showing a tracking control ATF signal in another embodiment of the present invention.

FIG. 14 is a diagram showing another example of the tracking control ATF signal in another embodiment of the present invention.

FIG. 15 is a diagram showing a tracking control ATF signal in another embodiment of the present invention.

FIG. 16 is a diagram showing another example of a tracking control ATF signal in another embodiment of the present invention.

FIG. 17 is a diagram showing a recording pattern of a magnetic tape in a conventional recording / reproducing apparatus.

[Explanation of symbols]

 1 ... Magnetic tape 1 1a ... ATF1 part 1e ... ATF2 part 1c ... Data area 1aa ... Sync signal 1ab ... Pilot signal 2 ... Drum 211 ... Rotating magnetic head 212 ... Rotating magnetic head 221 ... Rotating magnetic head 222 ... Rotating Magnetic head 4 ... Fixed head 5 ... Single reel cartridge 6 ... Capstan

Claims (9)

[Claims] 1. A recording / reproducing apparatus for forming oblique tracks on a recording medium, recording information by using a plurality of magnetic heads having different azimuths, and reproducing the information, wherein a tracking signal is applied to a part of the tracks. Recording, wherein the tracking signal is composed of a signal group repeated every first track number of continuous tracks and a signal group repeated every second track number of continuous tracks. Playback device. 2. The tracking signal comprises at least a tracking error determination signal portion, a synchronization signal portion for tracking error determination, and a block detection signal portion for recording and reproducing for each block composed of a plurality of tracks. The recording / reproducing device according to claim 1. 3. The tracking signal is made different from the position for recording / reproducing information, and at least two or more tracking error discrimination signal portions near the start end and end of an oblique track are provided. The recording / reproducing apparatus according to claim 1. 4. A tracking signal is recorded on a part of the track in a recording / reproducing apparatus for forming an oblique track on a recording medium, recording information by using a plurality of magnetic heads having different azimuths, and reproducing the information. However, the tracking signal includes at least a tracking error determination signal section and a synchronization signal section for tracking error determination, and the tracking error determination signal section and the synchronization signal section for tracking error determination are different from each other. A recording / reproducing apparatus characterized in that a track having the tracking error discrimination signal portion and a track having the synchronization signal portion for discriminating the tracking error are arranged alternately while being formed on the track. 5. The track, wherein at least 6 or more tracks are set as one group, and any track in the group can be identified by the tracking signal. The recording / reproducing apparatus according to item 4. 6. A track having the tracking error discrimination signal section and a track having the synchronization signal section for discriminating the tracking error are recorded and reproduced substantially at the same time. The recording / reproducing apparatus according to the item. 7. A sync signal for synchronizing with an information signal, which is 50 to 500 bytes, is provided between the tracking signal and an area for recording information. The recording / reproducing apparatus according to item 1 or 4. 8. A recording in which an oblique track is formed on a recording medium by using a plurality of magnetic heads having different azimuths, information is recorded, and a tracking signal is recorded on a part of the track and is reproduced. N information in the playback device
(Where N is a positive integer) divided and recorded collectively for each diagonal track, and 2 × (M + 1) (where M is a positive integer) on the drum on which the magnetic head is mounted and on the drum. )
Heads of N = I × (2 × (M + 1)) or (2 × (M +
1)) = I × N (I is a positive integer). 9. The 2 × (M +) disposed on the drum
1) The heads are arranged 180 degrees opposite to each other in M + 1 units, and N = I × (M + 1) or M + 1 = I × N (I is a positive integer). 8th
Recording / reproducing apparatus