JPH1011950A - Magnetic recording-reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To search for each data without increasing a capacity of a sub code area even when a plurality of kinds of data are recorded to one helical track in a helical scan-type magnetic recording/reproducing method making the search by recording search information to the sub code area. SOLUTION: Helical tracks 11 and control tracks 15 are recorded to a magnetic tape 3. A first data area 13, a second data area 14 and a sub code area 12 are set in the helical track 11. A first search information As for searching for the first data area 13 is recorded to the sub code area 12, and a second search information Bs for searching for the second data area 14 is recorded to the control track 15. Each data is searched for on the basis of the search informations As, Bs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing system such as a video tape recorder (VTR) or a data recorder for recording / reproducing signals on a magnetic tape by a helical scan system, and more particularly to a desired position on a magnetic tape. The present invention relates to an improvement of a search function for searching for and searching for.

[0002]

2. Description of the Related Art In recent years, a magnetic recording / reproducing system for recording a signal on a magnetic tape by a helical scan system has been widely used for a VTR, a data recorder and the like. Many of these magnetic recording / reproducing methods have a search function for searching / locating a desired position on a magnetic tape.

Hereinafter, an example of a search function in a magnetic recording / reproducing method according to the related art will be described.

FIG. 11 is a schematic configuration diagram schematically showing the configuration of a magnetic recording / reproducing system according to the prior art. In FIG. 11, 31 is a rotating drum, and 32 is
The rotating head is mounted at an angle of 80 °. Reference numeral 33 denotes a magnetic tape, which is wound obliquely around the rotating drum 31. 3
4 is a capstan motor for running the magnetic tape 33, and 35 is a pinch roller. 36 is a subcode search information detecting unit, 37 is a search control unit, and 38 is a capstan drive for driving the capstan motor 34.

FIG. 12 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to the prior art. In FIG. 12, 33 is a magnetic tape, and 39 is a helical track recorded on the magnetic tape 33 by the rotary head 32. Reference numeral 40 denotes a subcode area in which information necessary for a search (search information) is recorded, and 41, a data area in which ordinary recording data (for example, video data or the like) is recorded. Reference numeral 42 denotes a scanning trajectory of the rotary head 32 during a search.

A search operation in the magnetic recording / reproducing method according to the related art configured as described above will be described below.

At the time of search, the magnetic tape 3 is moved so that the rotary head 32 scans a desired subcode area 40.
3 is controlled. Then, the sub-code search information detection unit 36 detects the search information recorded in the sub-code area 40. The contents of the search information recorded in the subcode area 40 include date information (year, month, day, day of the week, recording time, etc.) and time information (time from the beginning of the tape, time from the beginning of the program). Etc.), program information (recording source, recording channel number, program number,
Program recording time), index information (index number, recording time from index, etc.), character information, and the like. Based on such search information, the search control unit 37 controls the rotation speed and direction of the capstan motor 34 via the capstan drive 38,
Search for the desired position of No. 3.

[0008]

In the magnetic recording / reproducing system according to the above-mentioned prior art, there is no problem with only one type of subcode area because only one type of data is recorded in the data area. .

However, when there are a plurality of types of data recorded in the data area, if each data is to be searched independently, search information is required for each data. However, there is a problem that the recording capacity of the data area decreases accordingly.

It is an object of the present invention to enable a search for each data without increasing the capacity of the subcode area even when a plurality of types of data are recorded on one helical track.

[0011]

According to the magnetic recording / reproducing method of the present invention, when a plurality of types of data are recorded on one helical track, at least one of the plurality of data search information is controlled. Whether to record on a track, provide a subcode area in each of a plurality of helical tracks continuous in the longitudinal direction of the tape, and record search information of each data individually in each subcode area, or use both of them together Alternatively, a plurality of search information may be recorded on each helical track without increasing the capacity of the subcode area, or a plurality of search information may be recorded on each helical track and one search information may be recorded on the control track. By combining these, multiple types of data can be stored on one helical truck. Even when the recording without increasing the capacity of the sub-code area, to allow the search of each data.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the magnetic recording / reproducing method of the present invention, a helical track is formed on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and a control head is used. A magnetic recording / reproducing method for recording / reproducing a control track on a magnetic tape by performing recording / reproducing, wherein at least two of a subcode area for search and a first data area and a second data area are provided on the helical track. The above-mentioned data area is provided, the first search information for searching the first data area is recorded in the subcode area, and the second search area for searching the second data area is recorded in the control track. 2 is recorded, and when the first data area is searched, the search is performed using the first search information. It was carried out, in the case of searching for the second data area is characterized by performing a search using the second search information. Even when two or more types of data are recorded in one helical track, the search information of one data is recorded in a subcode area, and the search information of another data is recorded in a control track. Each data can be searched independently without increasing the capacity of the subcode area.

According to a second aspect of the present invention, there is provided a magnetic recording / reproducing method in which helical tracks are sequentially formed on a magnetic tape in the longitudinal direction of the tape by a helical scan method using a rotary head mounted on a rotary drum to perform recording / reproducing. In the magnetic recording / reproducing method, a subcode area for search and N data areas (N is a natural number) are provided in the helical track, and the N It is characterized in that search information for searching each of the data areas is individually recorded, and when searching for each data area, a search is performed using the search information for the corresponding subcode area. 1
Even when N kinds of data (N is a natural number) are recorded in one helical track, the search information of each of the N data areas is individually recorded in each subcode area of the continuous N helical tracks. In addition, each data can be searched independently without increasing the capacity of the subcode area as compared with the related art.

According to a third aspect of the present invention, there is provided a magnetic recording / reproducing method in which helical tracks are sequentially formed on a magnetic tape in the longitudinal direction of the tape by a helical scan method using a rotary head mounted on a rotary drum to perform recording / reproducing. In the magnetic recording / reproducing method, a sub-code area for search and M data areas (M is an odd number) are provided in the helical track, and the M sub-code area of M continuous helical tracks includes It is characterized in that search information for searching each of the data areas is individually recorded, and the search speed at the time of the search is set to an odd multiple speed which is a multiple of M. Even when M kinds of data (M is an odd number) are recorded in one helical track, search information of each of the M data areas is individually recorded in each subcode area of the continuous M helical tracks. Accordingly, each data can be searched independently without increasing the capacity of the subcode area as compared with the conventional technique. Moreover, since the search speed is set to an odd multiple speed which is a multiple of M, the search information obtained for each head scan always relates to the same type of data, and the amount of search information obtained per unit rotation of the rotary head increases. , It is possible to perform a more detailed search for desired data.

According to a fourth aspect of the present invention, there is provided a magnetic recording / reproducing method wherein a helical track is formed on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and a helical track is formed on the magnetic tape using a control head. In this magnetic recording / reproducing method, recording and reproducing are performed by forming control tracks on the helical track, and a subcode area for search and N data areas (N is a natural number) are provided in ) Helical tracks in each subcode area have (N−
1) Search information for searching each of the N data areas is individually recorded, and search information for searching one of the N data areas is recorded in the control track. When searching for an area, the search is performed using the search information of the corresponding subcode area or control track. Even if N kinds of data (N is a natural number) are recorded in one helical track, continuous (N-1)
(N-1) in each subcode area of book helical truck
Each search information of each data area is individually recorded,
By recording the search information of one of the N data areas on the control track, each data can be searched independently without increasing the capacity of the subcode area as compared with the related art.

According to a fifth aspect of the present invention, there is provided a magnetic recording / reproducing method, wherein a helical track is formed on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and a helical track is formed on the magnetic tape using a control head. A magnetic recording / reproducing method for recording / reproducing by forming a control track in the helical track, wherein a sub-code area for search and N data areas (N is a natural number) are provided in the helical track, and N continuous helical tracks are provided. Search information for searching each of the N data areas is individually recorded in each subcode area of the track, and one of the N data areas is searched for in the control track. When search information is recorded and each data area is searched, the corresponding subcode area or control It is characterized by performing a search using the search information of the track. Even when N types of data (N is a natural number) are recorded in one helical track, search information of each of the N data areas is individually recorded in each subcode area of the continuous N helical tracks, By recording the search information of one of the N data areas in the control track, the capacity of the subcode area is not increased as compared with the related art.
Each data can be searched independently. For one data area, a search using a control track is also possible.

According to a sixth aspect of the present invention, there is provided the magnetic recording / reproducing method according to the second, fourth, or fifth aspect, wherein a search speed (running speed of the magnetic tape) is recorded in each subcode area. It is characterized in that the speed is an odd-numbered double speed excluding a multiple of the number of types of search information. Since the search information to be obtained changes for each head scan, all data can be searched independently.

According to a seventh aspect of the present invention, there is provided a magnetic recording / reproducing method in which helical tracks are sequentially formed on a magnetic tape in the longitudinal direction of the magnetic tape by a helical scan method using a rotary head mounted on a rotary drum. A magnetic recording and reproducing system for performing
N (N is a natural number) subcode areas and N data areas are provided, and search information for searching each of the data areas is recorded in each of the subcode areas. And Since search information on each data area can be obtained from each subcode area by one head scan, each data can be searched independently and finely.

According to an eighth aspect of the present invention, there is provided the magnetic recording / reproducing method according to the seventh aspect, wherein the N subcode areas are arranged apart from each other in the longitudinal direction of the helical track. Compared to the case where N subcode areas are packed and arranged, the scan locus becomes steeper, so that the search speed can be increased.

According to a ninth aspect of the present invention, in the magnetic recording / reproducing method, a helical track is formed on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and a helical track is formed on the magnetic tape using a control head. A magnetic recording / reproducing method for recording / reproducing by forming a control track on the helical track, wherein each of the helical tracks is provided with N (N is a natural number) data areas and (N-1) subcode areas; In each of the (N-1) subcode areas, search information for searching each of the (N-1) data areas of the N is individually recorded, and in the control track, One of the N
Search information for searching one data area is recorded, and when searching each data area, a search is performed using search information of a corresponding subcode area or control track. Even when N types (N is a natural number) of data are recorded in one helical track, search information of each of (N-1) data areas is individually recorded in (N-1) subcode areas. By recording the search information of one of the N data areas on the control track, the capacity of the subcode area is not increased as compared with the conventional technique.
Each data can be searched independently. Also, 1
Since search information on each data area can be obtained from each subcode area in each head scan, each data can be searched independently and finely.

According to a tenth aspect of the present invention, there is provided a magnetic recording / reproducing system, wherein a helical track is formed on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and a helical track is formed on the magnetic tape using a control head. A magnetic recording / reproducing method for recording / reproducing data by forming a control track in each of the helical tracks, wherein each of the helical tracks is provided with N (N is a natural number) data areas and N subcode areas; Search information for searching each of the N data areas is individually recorded in each of the code areas, and search information for searching one of the N data areas is recorded in the control track. When searching each data area, search information of the corresponding subcode area or control track It is characterized by performing a search using. Even when N types of data (N is a natural number) are recorded in one helical track, search information of each of the N data areas is individually recorded in N subcode areas, and N search areas are recorded in the control track. By recording the search information of one of the data areas, it is possible to increase the capacity of the subcode area as compared with the conventional technique,
Each data can be searched independently. For one data area, a search using a control track is also possible.

A magnetic recording / reproducing method according to an eleventh aspect of the present invention is the magnetic recording / reproducing method according to the ninth or tenth aspect, wherein a plurality of subcode areas are arranged apart from each other in the longitudinal direction of the helical track. . Compared to a case where a plurality of subcode areas are packed and arranged, the scan speed becomes steeper, so that the search speed can be increased.

Hereinafter, embodiments of a magnetic recording / reproducing method according to the present invention will be described in detail with reference to the drawings.

[Embodiment 1] FIG. 1 is a schematic configuration diagram schematically showing a configuration of a magnetic recording / reproducing system according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a rotary drum, and 2 denotes a rotary head mounted on the rotary drum 1 so as to face 180 °. Reference numeral 3 denotes a magnetic tape which is wound obliquely around the rotating drum 1. Reference numeral 4 denotes a control head for recording and reproducing a tracking control signal. 5 is a capstan motor for running the magnetic tape 3, and 6 is a pinch roller.
Reference numeral 7 denotes a subcode search information detection unit, 8 denotes a control search information detection unit, and 9 denotes a search control unit. Reference numeral 10 denotes a capstan drive for driving the capstan motor 5.

FIG. 2 is a schematic diagram showing a recording pattern of a magnetic tape in the magnetic recording / reproducing method according to the first embodiment of the present invention. In FIG. 2, 3 is a magnetic tape, 11 is a helical track, and 12 is a subcode area. In the subcode area 12, search information, which is information necessary for searching time information and program information, is recorded. 13
Is a first data area, and 14 is a second data area.
Reference numeral 15 denotes a control track on which a tracking control signal is recorded. Reference numeral 16 denotes a scan locus of the rotary head 2 during a search.

The search operation of the magnetic recording / reproducing method according to the first embodiment configured as described above will be described below.

Normal data (for example, video signals) is recorded in the first data area 13 and the second data area 14 of the helical track 11 by using the rotary head 2.
Now, it is assumed that data A is recorded in the first data area 13 and data B is recorded in the second data area 14. A control signal for tracking control is recorded on the control track 15 by the control head 4.

A subcode area 12 is provided in a part of the helical track 11, and the first
The first search information As such as time information and program information relating to the data A recorded in the data area 13 is recorded. The contents of the first search information As recorded in the subcode area 12 are date information (year, month,
Date, day of week, recording time, etc.), time information (time from tape start, time from program start, etc.), program information (recording source, recording channel number, program number, program recording time, etc.), index information (Index number, recording time from the index, etc.), character information, etc., and these data can be individually rewritten. On the other hand, the control track 15 has the data B recorded in the second data area 14.
The second search information (Bs) is recorded.

The first code recorded in the subcode area 12
When the data A in the data area 13 is searched, the rotary head 2 scans the subcode area 12 to acquire the data in the subcode area 12, and the subcode search information detection unit 7 detects the first search information As. Is detected. Based on the first search information As, the search control unit 9 outputs the rotation speed of the capstan motor 5 via the capstan drive 10.
The direction is controlled and a desired position on the magnetic tape 3 is searched. Here, the first search information As recorded in the sub-code area 12 is only related to the data A recorded in the first data area 13, and the first search information As is recorded in the sub-code area 12.
Is the same as in the prior art, and the capacity does not increase.

On the other hand, when searching for the data B in the second data area 14 recorded on the control track 15, the control head 4 scans the control track 15 to acquire the data of the control track 15, and The search information detecting section 8 detects second search information (Bs) relating to the data B from the reproduction control signal, and based on this information, the search control section 9 controls the rotation speed of the capstan motor 5 via the capstan drive 10. Control the direction and search for a desired position on the magnetic tape 3. Here, the second search information (Bs) detected from the control signal is elapsed time information and cueing information.

The elapsed time information is obtained by counting the control signal. As the control signal, a pulse signal having a constant period is recorded for performing tracking control of the helical track 11. For example,
In the case of the VHS-VTR, a pulse signal having a period of 1/30 second is recorded as the control signal. By counting the pulses of such a control signal, the elapsed time from the current position on the magnetic tape 3 can be known. Based on the elapsed time information thus obtained, the search control unit 9 controls the capstan drive 10 so that the magnetic tape 3 moves to a desired time position, and performs an elapsed time search.

The cue information is obtained by detecting the modulated control signal. This is the current VH
This is the same as the method used in the search (VISS / VASS) of the S system VTR. Usually, the high / low duty ratio of the control signal is constant. When the cue information is recorded, the duty ratio of the control signal to be recorded is changed at the position where the cue of the magnetic tape 3 is to be performed, for example, at the head position of the program.
Modulate the control signal. At the time of search, the control search information detecting section 8 detects the position where the control signal is modulated, that is, the position where the cue information is recorded. Then, the search control section 9 controls the capstan motor 5 so that the magnetic tape 3 moves to a position where the cue signal is detected, and performs a cue search.

As described above, according to the first embodiment, 1
Even when two types of data A and B are recorded on the helical track 11, the first search information As for one data A is recorded in the subcode area 12 and the second search information As for the other data B is recorded. By recording the search information (Bs) on the control track 15, two data can be independently searched without increasing the subcode area 12 as compared with the prior art.

In the first embodiment, the first data area 13 and the second data area 1
Although the two data areas 4 are provided, three or more data areas may be provided in the helical track 11.
However, in this case, since the number of data areas that can be searched in the first embodiment is limited to two, there are data areas that cannot be searched.

[Second Embodiment] FIG. 3 is a schematic configuration diagram schematically showing a configuration of a magnetic recording / reproducing method according to a second embodiment of the present invention. In FIG. 3, reference numeral 1 denotes a rotary drum, and 2 denotes a rotary head mounted on the rotary drum 1 so as to be opposed to the rotary drum 1 by 180 degrees, and have different azimuth angles. 3 is a magnetic tape, 5 is a capstan motor, 6 is a pinch roller, 7
Is a subcode search information detecting section, 9 is a search control section, 1
Reference numeral 0 denotes a capstan drive, and the above configuration is the same as that in FIG. 1 of the first embodiment. However, the control search information detection unit 8 in FIG. 1 is not provided, and the control head 4 is not shown.

FIG. 4 is a schematic diagram showing a recording pattern of a magnetic tape in the magnetic recording / reproducing method according to the second embodiment of the present invention. In FIG. 4, 3 is a magnetic tape, 11 is a helical track, and L azimuth and R azimuth are formed on the helical track 11 alternately. Reference numeral 21 denotes a subcode area, in which search information necessary for searching time information, program information, and the like is recorded. 2
2 is a first data area, 23 is a second data area, 24
Is a third data area, data A is recorded in the first data area 22, data B is recorded in the second data area 23, and data C is recorded in the third data area 24. Reference numerals 25 and 27 denote scan trajectories of the L azimuth head of the rotary head 2 at the time of search, and reference numeral 26 denotes a scan trajectory of the R azimuth head.

The search operation of the magnetic recording / reproducing method according to the second embodiment configured as described above will be described below.

A subcode area 21 is provided in a part of the helical track 11, and search information such as time information and program information is recorded in the subcode area 21. Here, the first search information on the data A is As
Assuming that the second search information for data B is Bs and the third search information for data C is Cs, in the second embodiment, the first search information As, the second search information Search information Bs and third search information Cs are repeatedly recorded in order. The contents of the search information recorded in the subcode area 21 are the same as those in the first embodiment, and a description thereof will be omitted.

At the time of search, the rotary head 2 scans the subcode area 21 to acquire data in the subcode area 21, and the subcode search information detection section 7 detects search information. Then, based on the detected search information, the search control unit 9 controls the rotation speed and direction of the capstan motor 5 via the capstan drive 10 to search for a desired position on the magnetic tape 3.

In the second embodiment, the search speed is set to 5 times speed. At this search speed, search information to be obtained changes for each head scan. That is, as shown in FIG. 4, when the L azimuth head of the rotary head 2 passes through the scan locus 25, the track No. The first search information As related to one data A can be obtained. When the R azimuth head of the next rotary head 2 has passed the scan locus 26, the track No. When the third L azimuth head has passed the scan locus 27, the third search information Cs relating to the data C of the track No. 6 can be obtained. The second search information Bs relating to the eleventh data B can be obtained. Therefore, for each head scan, the first search information As and the third search information C
Since s and the second search information Bs can be sequentially and sequentially acquired in this order, three types of data A, C, and B can be searched independently. At this time, in each of the helical tracks 11, the search information recorded in the subcode area 21 is related to one type of data.
The size of 1 is the same as in the prior art, and the capacity does not increase.

In the second embodiment, three types of data A, B, and C are recorded on one helical track 11 and the search speed is set to 5 times speed. However, in general, N types (N If the search speed is set to an odd multiple speed excluding a multiple of N, the search information obtained for each head scan changes, so that all data can be searched independently.

[Third Embodiment] The configuration of a magnetic recording / reproducing system according to a third embodiment of the present invention is the same as that shown in FIG. 3 according to the second embodiment, and therefore illustration and description are omitted. . FIG. 5 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to Embodiment 3 of the present invention. In FIG. 5, the same reference numerals as those in FIG. 4 according to the second embodiment denote the same constituent elements. Briefly described, 3 is a magnetic tape, 11 is a helical track, 21 is a subcode area, and 22 is a first data area. , 23 are the second data area, 24 is the third data area, 25 and 27 are the scan trajectories of the L azimuth head of the rotary head 2, and 26 is the scan trajectory of the R azimuth head. The third embodiment differs from the second embodiment in FIG. 4 in that the search speed is tripled. As a result, the intervals between the scan trajectories 25, 26, and 27 are reduced.

The search operation of the magnetic recording / reproducing method according to the third embodiment configured as described above will be described below.

The basic part of the search operation of the magnetic recording / reproducing method according to the third embodiment is the same as that of the second embodiment, and the description is omitted. The difference from the second embodiment is that the search speed is tripled. When the search speed is 3 × speed, as shown in FIG. 5, when the L azimuth head of the rotary head 2 passes through the scan locus 25, the track No. 1st data A
Search information As can be obtained. When the R azimuth head of the next rotary head 2 has passed the scan locus 26, the track No. When the first L azimuth head has passed the scan locus 27, the first search information As related to the same data A of the track No. 4 is obtained. The first search information As related to the same data A of 7 can be obtained. Therefore, the search information obtained every head scan is always As. In this case, since the amount of search information that can be obtained per unit rotation of the rotary head 2 is larger than in the second embodiment, a more detailed search can be performed. At this time, in each of the helical tracks 11, the subcode area 21
Are related to one type of data, so that the size of one subcode area 21 is the same as that of the prior art, and the capacity is It does not increase.

In the third embodiment, three types of data A, B, and C are recorded on one helical track 11 and the search speed is tripled. However, in general, M types (M When the search speed is set to an odd multiple speed which is a multiple of M, the search information obtained for each head scan always relates to the same type of data. , You can search more finely.

[Fourth Embodiment] The configuration of a magnetic recording / reproducing method according to a fourth embodiment of the present invention is the same as that shown in FIG. 1 according to the first embodiment, and therefore illustration and description are omitted. . FIG. 6 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to Embodiment 4 of the present invention. 6, the same reference numerals as those in FIG. 4 according to the second embodiment denote the same components. Briefly described, 3 is a magnetic tape, 11 is a helical track, 21 is a subcode area, and 22 is a first data area. , 23 are the second data area, 24 is the third data area, 25 and 27 are the scan trajectories of the L azimuth head of the rotary head 2, and 26 is the scan trajectory of the R azimuth head. The fourth embodiment differs from the second embodiment in FIG. 4 in that the control track 15 is added and the search information recorded in the subcode area 21 includes one helical track 11. Each time the search proceeds, the first search information As and the second
Is repeatedly recorded in order. And the control track 15 has the third
The third search information (Cs) relating to the data C recorded in the data area 24 is recorded. The contents of the search information recorded in the subcode area 21 are the same as those in the first embodiment, and a description thereof will be omitted. The third search information (Cs
) Are elapsed time information and cueing information.

The search operation of the magnetic recording / reproducing method according to the fourth embodiment configured as described above will be described below.

At the time of searching for the data C recorded in the third data area 24, the control head 4 scans the control track 15 and the control search information detecting section 8 detects the data C from the reproduction control signal.
The search control unit 9 controls the rotation speed and direction of the capstan motor 5 via the capstan drive 10 based on the third search information (Cs) for the magnetic tape 3 based on this information. Search for a location.

When searching for data A recorded in the first data area 22 or data B recorded in the second data area 23, the rotary head 2 scans the subcode area 21 and scans the subcode area 21. And the sub-code search information detecting section 7 detects the search information. The search control unit 9 controls the rotation speed and direction of the capstan motor 5 via the capstan drive 10 based on the detected search information,
Search for the desired position of.

In the fourth embodiment, since the search speed is set to 5 times speed, the search information to be obtained changes every head scan. That is, as shown in FIG. 6, the L azimuth head of the rotary head 2
When passing through the track No. The first search information As related to one data A can be obtained. Then, the R azimuth head of the next rotary head 2 moves to the scanning locus 2
When passing through the track No. 6, The second search information Bs relating to the sixth data B can be obtained. Similarly, the L azimuth head of the next rotary head 2 moves to the scan locus 2
When passing through the track No. 7, 11 data A
Can be obtained as the first search information As. Therefore, the first search information As, the second search information
Can be sequentially and cyclically acquired. At this time, in each of the individual helical tracks 11, the search information recorded in the subcode area 21 is related to one type of data. And the capacity does not increase.

Further, in the second embodiment (FIG. 4), new search information can be obtained every three head scans, whereas in the fourth embodiment, new search information can be obtained every two head scans. Therefore, a more detailed search is possible.

[0052] In the fourth embodiment, one of the helical tracks 11 on three types of data A, B, and record C, and was the search speed and 5x speed, generally, N ₁ to one track
When (= N + 1) kinds of data (N ₁ and N are natural numbers) are recorded and the search speed is set to an odd double speed excluding a multiple of (N ₁ −1 = N), the search information obtained for each head scan is Because it changes, all data can be searched independently.

In the fourth embodiment, the search speed is set to 5 times speed, but the search speed may be any speed as long as the data of the subcode area 21 can be acquired.

Further, in the fourth embodiment, the search information As and Bs are repeatedly recorded in the subcode area 21, but the search information As, Bs and Cs are recorded in the subcode area 21.
You may record s repeatedly. In this case, the search information recorded on the control track 15 may be related to any of the data A, B, and C.
Generally, it is sufficient to provide N data areas and N subcode areas and record search information on one of the N data areas in the control track.

[Fifth Embodiment] The configuration of a magnetic recording / reproducing method according to a fifth embodiment of the present invention is the same as that shown in FIG. 3 according to the second embodiment, so that illustration and description are omitted. . FIG. 7 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to Embodiment 5 of the present invention. In FIG. 7, 3 is a magnetic tape, and 11 is a helical track. Reference numerals 21a, 21b, and 21c denote first to third subcode areas, in which search information necessary for searching time information, program information, and the like is recorded. Although there are three subcode areas, the total capacity of the first to third subcode areas 21a, 21b, and 21c is the same as that of the second embodiment (FIG. 4). 22
Denotes a first data area, 23 denotes a second data area, and 24 denotes a third data area. Data A, data B, and data C are recorded in the respective data areas. Reference numeral 28 denotes a scanning locus of the rotary head 2 during a search.

The search operation of the magnetic recording / reproducing method according to the fifth embodiment configured as described above will be described below.

The first to third subcode areas 21a, 21b, 21 provided in a part of the helical track 11
In c, search information such as time information and program information is recorded. Here, the first search information for data A is As, the second search information for data B is Bs,
Assuming that the third search information for data C is Cs, in the fifth embodiment, the first subcode area 21a has the first
Is stored in the second sub-code area 21b, and the second search information Bs is stored in the third sub-code area 21c.
Records the third search information Cs.
Such first to third subcode areas 21a,
21 b and 21 c are provided for each of the helical trucks 11.

At the time of the search, the rotary head 2 is moved from the first to the third
To the first to third search information As and Bs.
, Cs at once, and the sub-code search information detecting section 7 detects the search information. Then, based on the detected search information, the search control unit 9 sets the capstan drive 10
, The rotational speed and direction of the capstan motor 5 are controlled, and a desired position of the magnetic tape 3 is searched. As described above, in the fifth embodiment, the search information on each data area can be obtained by one head scan.
Each data can be searched independently and finely.

In the fifth embodiment, the first to third
Subcode areas 21a, 21b and 21c are arranged continuously in the longitudinal direction of the helical track 11,
The three subcode areas 21a, 21b, 21c may be arranged apart from each other in the longitudinal direction of the helical track 11. FIG. 8 shows a schematic diagram of the recording pattern of the magnetic tape in this case. In FIG. 1 and the track number. 5, the second search information Bs and the track No. Nine third search information Cs has been obtained by one head scan. Thus, when the subcode areas 21a, 21b, 21c are arranged apart from each other in the longitudinal direction of the helical track 11, each subcode area is small and located apart from each other in the longitudinal direction of the magnetic tape 3, and the scan is performed. Because the inclination of the locus 28 becomes steep,
The search speed can be made higher than in the case of FIG. 7 in which the subcode areas 21a, 21b, 21c are continuously arranged in the longitudinal direction of the helical track 11.

In the fifth embodiment, three data areas and three subcode areas are provided on the helical track 11, but the number of data areas and subcode areas provided on the helical track 11 is arbitrary. .

[Embodiment 6] The configuration of a magnetic recording / reproducing system according to Embodiment 6 of the present invention is the same as that shown in FIG. 1 according to Embodiment 1, so that illustration and description are omitted. . FIG. 9 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to Embodiment 6 of the present invention. In FIG. 9, the same reference numerals as those in FIG. 7 according to the fifth embodiment denote the same components. Briefly described, 3 is a magnetic tape, 11 is a helical track, and 21a and 21b are necessary for searching for time information and program information. First and second subcode areas in which various search information is recorded, 22
Is a first data area in which data A is recorded, 23 is a second data area in which data B is recorded, 24 is a third data area in which data C is recorded, and 28 is a rotation in search. 6 is a scanning locus of the head 2.

The difference from FIG. 7 according to the fifth embodiment is that a control track 15 is added and that two subcode areas 21a and 21b are provided. Although there are two subcode areas, the combined capacity of the first and second subcode areas 21a and 21b is the same as in the first embodiment (FIG. 2). In the first subcode area 21a, first search information As related to data A is recorded, and in the second subcode area 21b, second search information Bs related to data B is recorded. And
In the control track 15, third search information (Cs) of elapsed time information and cue information of the data C is recorded.

The search operation of the magnetic recording / reproducing method according to the sixth embodiment configured as described above will be described below.

At the time of searching for the data C recorded in the third data area 24, the control head 4 scans the control track 15 and the control search information detecting section 8 detects the data C from the reproduction control signal.
The search control unit 9 controls the rotation speed and direction of the capstan motor 5 via the capstan drive 10 based on the third search information (Cs) for the magnetic tape 3 based on this information. Search for a location.

When searching for data A recorded in the first data area 22 or data B recorded in the second data area 23, the subcode areas 21a, 21a
The first and second search information As and Bs are obtained at a time by the rotary head 2 scanning the rotary shaft 1b, and the search controller 9 controls the capstan motor 5 via the capstan drive 10 based on the search information. Control the rotation speed and direction,
A desired position on the magnetic tape 3 is searched. in this way,
In the sixth embodiment, each data can be searched independently.

In the sixth embodiment, the first and second subcode areas 21a and 21b are arranged continuously in the longitudinal direction of the helical track 11, but the two subcode areas 21a and 21b are The helical tracks 11 may be arranged apart from each other in the longitudinal direction. FIG. 10 shows a schematic diagram of the recording pattern of the magnetic tape in this case. FIG.
In the track No. 6 first search information As
And track No. Ten second search information Bs can be obtained by one head scan. As described above, when the subcode areas 21a and 21b are arranged apart from each other in the longitudinal direction of the helical track 11, each subcode area is small and located apart in the longitudinal direction of the magnetic tape 3,
Since the inclination of the scan trajectory 28 becomes steep, the search speed can be made higher than in the case of FIG. 9 in which the subcode areas 21a and 21b are continuously arranged in the longitudinal direction of the helical track 11.

[0067] Further, in Embodiment 6, it is provided with the three data areas and two sub-code area in the helical track 11, N ₁ to the helical track 11 (=
N + 1) data areas (N ₁ and N ₂ are natural numbers) and (N
₍ 1-1-1 = N) subcode areas may be provided.

Further, in the sixth embodiment, the first and second sub-code areas 21a and 21b have the first and second sub-code areas.
Is repeatedly recorded, but after adding the control track 15, the subcode area is divided into three, and the first to third search information As, Bs and Cs are respectively repeated. You can record it. In this case, the search information recorded on the control track 15 may be related to any of the data A, B, and C. Generally, it is sufficient to provide N data areas and N subcode areas and record search information on one of the N data areas on the control track 15.

[0069]

According to the magnetic recording / reproducing method of the present invention, even when a plurality of types of data are recorded on one helical track, each data can be searched without increasing the capacity of the subcode area. Is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram schematically showing a configuration of a magnetic recording / reproducing method according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to the first embodiment.

FIG. 3 is a schematic configuration diagram schematically showing a configuration of a magnetic recording / reproducing method according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to a second embodiment.

FIG. 5 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to a third embodiment of the present invention.

FIG. 6 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to a fourth embodiment of the present invention.

FIG. 7 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to a fifth embodiment of the present invention.

FIG. 8 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to an embodiment to which Embodiment 5 of the present invention is applied.

FIG. 9 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to a sixth embodiment of the present invention.

FIG. 10 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to an embodiment to which Embodiment 6 of the present invention is applied.

FIG. 11 is a schematic configuration diagram schematically showing a configuration of a magnetic recording / reproducing method according to a conventional technique.

FIG. 12 is a schematic diagram showing a recording pattern of a magnetic tape in a magnetic recording / reproducing method according to a conventional technique.

[Description of Signs] 1 ... Rotating Drum 2 ... Rotating Head 3 ... Magnetic Tape 4 ... Control Head 5 ... Capstan Motor 6 ... Pinch Roller 7 ... Subcode Search Information Detection Unit 8 ... Control Search Information detection unit 9 Search control unit 10 Capstan drive 11 Helical track 12 Subcode area 13 First data area 14 Second data area 15 Control track 16 Scan trajectory 21... Subcode area 21a... First subcode area 21b... Second subcode area 21c... Third subcode area 22... First data area 23. ... Third data area 25... Scan trajectory of L azimuth head 26... Scan trajectory of R azimuth head 27. Scan trajectory 28 ...... scan trajectories As ...... first search information Bs ...... second search information Cs ...... third search information Masuheddo

Claims (11)

[Claims] 1. A magnetic recording and reproducing method in which a helical track is formed on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and a control track is formed on a magnetic tape using a control head. A recording / reproducing method, wherein a subcode area for search and at least two or more data areas of a first data area and a second data area are provided in the helical track, and the first code area is provided in the subcode area. The first search information for searching the data area is recorded, the second search information for searching the second data area is recorded on the control track, and the first data area is searched for. When the search is performed, a search is performed using the first search information, and when the second data area is searched, the search is performed. A magnetic recording / reproducing method, wherein a search is performed using the second search information. 2. A magnetic recording / reproducing method in which helical tracks are sequentially formed on a magnetic tape in a longitudinal direction of a tape by a helical scan method using a rotary head mounted on a rotary drum, and recording / reproduction is performed. A subcode area for search and N (N is a natural number) data areas are provided, and a subcode area of N consecutive helical tracks is searched for searching each of the N data areas. A magnetic recording / reproducing method in which information is individually recorded, and when searching each data area, a search is performed using search information of a corresponding subcode area. 3. A magnetic recording / reproducing method in which helical tracks are sequentially formed on a magnetic tape in a longitudinal direction of a tape by a helical scan method using a rotary head mounted on a rotating drum, and recording / reproducing is performed. A subcode area for search and M data areas (M is an odd number) are provided, and a subcode area of M continuous helical tracks is a search for searching each of the M data areas. A magnetic recording / reproducing method, wherein information is individually recorded, and a search speed at the time of a search is set to an odd multiple which is a multiple of M. 4. A magnetic head for forming a helical track on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum and forming a control track on the magnetic tape using a control head for recording and reproducing. In the recording / reproducing method, a subcode area for search and N data areas (N is a natural number) are provided in the helical track, and each subcode area of the continuous (N-1) helical tracks is Search information for searching each of the (N-1) data areas of the N pieces is individually recorded, and one of the N data areas is searched for in the control track. When the search information is recorded and each data area is searched, the corresponding subcode area or control track A magnetic recording / reproducing method, wherein a search is performed by using search information. 5. A magnetic recording and reproducing method in which a helical track is formed on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and a control track is formed on a magnetic tape using a control head. In the recording / reproducing method, a subcode area for search and N data areas (N is a natural number) are provided in the helical track, and each of the N subcode areas of N consecutive helical tracks has the N number of data areas. Search information for searching each of the data areas is individually recorded, and one of the N data is recorded in the control track.
A magnetic recording / reproducing method for recording search information for searching one data area and performing a search using search information of a subcode area or a control track corresponding to each data area when searching the data areas; . 6. The search speed (moving speed of the magnetic tape) is set to an odd multiple speed excluding a multiple of the number of types of search information recorded in each subcode area.
A magnetic recording / reproducing method according to claim 4 or claim 5. 7. A magnetic recording / reproducing system in which helical tracks are sequentially formed on a magnetic tape in a longitudinal direction of the magnetic tape by a helical scan system using a rotary head mounted on a rotary drum, and recording / reproducing is performed. Each of the tracks is provided with N (N is a natural number) subcode areas and N data areas, and search information for searching each of the data areas is recorded in each of the subcode areas. A magnetic recording / reproducing method. 8. The magnetic recording / reproducing method according to claim 7, wherein N subcode areas are arranged apart from each other in the longitudinal direction of the helical track. 9. A magnetic head for forming a helical track on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum, and forming a control track on the magnetic tape using a control head for recording and reproducing. In the recording / reproducing method, each of the helical tracks includes N data areas (N is a natural number)
1) subcode areas are provided, and in each of the (N-1) subcode areas, search information for searching each of the (N-1) data areas of the N is provided. Individually recorded, search information for searching one of the N data areas is recorded in the control track, and when each data area is searched, a corresponding subcode area or control track is searched for. A magnetic recording / reproducing method, wherein a search is performed using the above search information. 10. A magnetic head for forming a helical track on a magnetic tape by a helical scan method using a rotary head mounted on a rotary drum and forming a control track on a magnetic tape using a control head for recording and reproducing. In a recording / reproducing method, each of the helical tracks is provided with N (N is a natural number) data areas and N subcode areas, and each of the N subcode areas is provided with the N data areas. Are individually recorded, search information for searching one of the N data areas is recorded on the control track, and when searching each data area, Is characterized by performing a search using the search information of the corresponding subcode area or control track. Recording and playback method. 11. The magnetic recording / reproducing method according to claim 9, wherein a plurality of subcode areas are arranged apart from each other in a longitudinal direction of the helical track.