JPH06338181A - Recording and reproducing method - Google Patents

Abstract

PURPOSE:To obtain a recording and reproducing method by which a plurality of items can be recorded as sub-codes and, in addition, can perform edition at every item. CONSTITUTION:A sub-code area having a plurality of sync blocks is provided at part of an inclined track on a tape. Each sync block is composed of a sync section 100, ID section 100 containing ID data, and data section 120 containing sub-data. Two or more kinds of each of ID data blocks in which inter-track ID data parts are recorded in the same content and sub-data blocks in which inter-track sub-data are recorded in the same content, are formed over a plurality of adjacent tracks in the advancing direction of the tape. In addition, at least one boundary of the ID data blocks in the tape advancing direction is shifted from the boundary of the sub-data blocks. Moreover, common data and the characteristic data of each block are recorded in each ID data block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing method for recording information such as video (video), audio, and data on a tape together with a subcode and reproducing the recorded information, and particularly recording an editable subcode. And a recording / reproducing method. Here, the editing is a function of changing the recording content including rewriting of a predetermined recording area, erasing of a predetermined recording area, continuous additional recording after the predetermined recording area, and the like.

[0002]

2. Description of the Related Art Recently, video tape recorders (hereinafter referred to as V
A magnetic recording / reproducing apparatus using a magnetic tape as a medium, such as TR), has been put into practical use and is in widespread use. In addition, further miniaturization of devices by higher density recording and development of digitization are being carried out.

Usually, when an information signal is recorded on a recording medium as a digital signal, it is recorded including a subcode. Here, the subcode is a cue ID that indicates the recording start position of data, an absolute time code that indicates the absolute position on the tape, a user time code that is determined by the user, and the like. An example of recording such a subcode is D
AT (Digital Audio Tape recorder), 8mm VTR
And so on. It is well known that, in the DAT or 8 mm VTR standard, it is possible to edit the recorded video signal or audio signal while retaining the recorded video signal and re-recording only the subcode.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the standard of 8 mm VTR and 8 mm VTR, information about a plurality of items (the above-mentioned cue ID, absolute time code, user time code, etc.) is recorded in the subcode area of one track, and one of the items ( For example, editing such as rerecording only the cue ID, absolute time code or user time code cannot be performed.

An object of the present invention is to solve the above-mentioned problems, and even when a subcode attached to a video signal or an audio signal includes a plurality of items, each item can be edited and high speed. It is intended to provide a recording / reproducing method with enhanced subcode detection capability at the time of search.

[0006]

In order to solve the above-mentioned problems, a recording / reproducing method of the present invention has N (where N is an integer of 1 or more) sync blocks in a part of an inclined track on a tape. A recording / reproducing method in which a sub-code area is provided, the sync block has a sync part, an ID part, and a data part, the ID part includes ID data, and the data part includes sub-data. A first ID data block in which the ID data portions between tracks are recorded in the same content or almost the same content over the adjacent P1 (where P1 is an integer of 2 or more) of the inclined tracks,
I between the tracks over P2 adjacent P-shaped tracks (where P2 is an integer of 2 or more) in the tape traveling direction.
A second ID data block in which the D data portion is recorded with the same or almost the same content as another, forms at least two types of the ID data blocks in the tape advancing direction, and the adjacent Q1 pieces in the tape advancing direction ( However, Q1
Is an integer of 2 or more) and the first sub-data block in which the sub-data portion between the tracks is recorded with the same or almost the same content over the inclined tracks, and Q2 adjacent to each other in the tape traveling direction (where Q2 is 2 or more). An integer) of the sub-data blocks between the tracks over the slanted tracks, the second sub-data blocks having the same or almost the same contents are recorded, and at least two types of the sub-data blocks are formed in the tape traveling direction. However, at least one boundary of the ID data block in the tape traveling direction is displaced from the boundary of the sub data block, and further, common data and data unique to each block are recorded in each ID data block. It is a feature.

[0007]

According to the present invention, at least one boundary of the ID data block in the tape traveling direction is offset from the boundary of the sub data block. Therefore, a plurality of data or sub data recorded in each block of the ID data block are recorded. After reproducing multiple data recorded in each block of the block,
It is possible to rewrite each data while correcting, re-recording and saving as necessary. Further, by recording common data in each ID data block, it is possible to improve the detection probability of the common data during high-speed search.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a recording operation of a magnetic recording / reproducing apparatus in an embodiment to which the recording / reproducing method of the present invention is applied.

In FIG. 1, 1 is a magnetic tape, 2a, 2
Reference numeral b is a rotary head attached to a cylinder (not shown), and 24-0 to 24-9 are tracks formed on the magnetic tape 1. Reference numeral 7 denotes a tape running device, which is composed of a capstan motor 4, a pinch roller 5, and a capstan control circuit 6. Reference numeral 8 is a video signal generator, 9 is a clock generator, 10 is a segmenting circuit, 11 is a frame synchronization signal generator, and 12 is a tracking signal generator. 21 is a subcode generator,
It is composed of an ID data 1 generator 13, an ID data 2 generator 14, a sub data 1 generator 15, a sub data 2 generator 16, a sync generator 17, and a combiner 20. further,
Reference numeral 22 is a recorder, and 23 is a rotary head controller. This embodiment is an example in which two tracks are recorded and reproduced substantially simultaneously by the rotary heads 2a and 2b. FIG. 2 is a view showing the arrangement of the rotary heads on the cylinder in this embodiment.
Is a cylinder.

In each track on the magnetic tape shown in FIG. 1, a tracking signal area 2 formed at the beginning of the track.
A positioning signal area 27 is provided in a part of 8 to record the positioning signal. A relatively high frequency is selected for this positioning signal, which is unlikely to be affected by the adjacent track. Further, a tracking pilot signal is frequency-multiplexed and recorded in the tracking signal area 28. This pilot signal has two different frequencies f1 and f for every other track.
Alternately recorded at 2. The frequencies of these two types of pilot signals are selected to be relatively low frequencies that are less likely to be affected by the azimuth loss of the rotary heads 2a and 2b. Also,
A video signal is recorded in the video signal area 25, and a subcode is recorded in the subcode area 26.

Next, the recording operation in FIG. 1 will be described. At the time of recording, the magnetic tape 1 travels by a capstan motor 4 and a pinch roller 5 whose rotation speed is controlled by a capstan control circuit 6.

The video signal generator 8 produces a signal equivalent to 30 frames per second (one frame is one screen of a television). In the segmenting circuit 10, one frame of signal is
Divide into 0 segments. Finally, one frame of the video signal is divided into 10 tracks and recorded. The segmented video signal (segmented video signal) including the segment number is input to the recorder 22.

The clock generator 9 produces a clock synchronized with the input video signal. Here, 30 per second
The video signal of the frame is input, and a 150 Hz clock synchronized with the video signal is generated.

The tracking signal generator 12 has two different frequencies f depending on the clock of the clock generator 9.
A tracking signal including the pilot signals 1 and f2 and the positioning information signal is generated. This tracking signal is input to the recorder 22.

The frame sync signal generator 11 generates a 30 Hz frame sync signal which is synchronized with the frame of the input video signal.

In the ID data 1 generator 13, an application ID (hereinafter abbreviated as APID), a tape counter value, a block identification code, and a cue ID (hereinafter SRID).
(Abbreviated) and the program number is generated. Detailed contents will be described later. ID data 1
Is input to the synthesizer 20.

The ID data 2 generator 14 generates ID data 2 including an APID, a tape counter value, a block identification code, and a control ID (hereinafter abbreviated as COID). Detailed contents will be described later. The ID data 2 is input to the synthesizer 20.

The sub data 1 generator 15 generates sub data 1 including absolute position information (tape counter value, absolute time code, etc.) and text information. Detailed contents will be described later. The sub data 1 is input to the synthesizer 20.

In the sub data 2 generator 16, the sub data 2 including user information (recording date, recording time, minute, second, etc.) is included.
Is generated. Detailed contents will be described later. The sub data 2 is input to the synthesizer 20.

The sync generator 17 generates a sync signal. Although details will be described later, in a subcode area in one track, a plurality of subcodes, for example, 1
It is recorded in two small areas. Note that, hereinafter, this small area is called a sync block (SB). Now, the sync signal is a signal indicating the recording start position of the sync block.
The sync signal is input to the synthesizer 20.

In the synthesizer 20, first, the clock generator 9
Of the segmented video signal input to the recorder 22 by the clock of the clock and the frame sync signal of the frame sync signal generator 11 (0
~ 9) is recognized. Then, the combination of ID data and sub-data to be input to the recorder 22 is switched according to the segment number. Specifically, the segment number is 0,
When the number is 1 or 2, the sub-code that combines the sync signal, the ID data 1 and the sub-data 1 is used. When the segment number is 3 or 4, the sub-code that combines the sync signal, the ID data 2 and the sub-data 1 When the numbers are 5 and 6, the sub-code that combines the sync signal, the ID data 2 and the sub-data 2, and when the segment numbers are 7, 8 and 9 the sub-code that combines the sync signal, the ID data 1 and the sub-data 2 The code is input to the recorder 22.

The ID data 1 has a segment number of 0,
The data is input to the recorder 22 in the case of 1, 2, 7, 8, and 9, but the ID data has the same content within one frame regardless of the segment number.

The ID data 2 has a segment number of 3,
The data is input to the recorder 22 at 4, 5, and 6, but the ID data has the same content in one frame regardless of the segment number.

The sub data 1 has a segment number of 0,
Although the data is input to the recorder 22 in the case of 1, 2, 3, and 4, the sub data has the same content in one frame regardless of the segment number.

The sub data 2 has a segment number of 5,
The data is input to the recorder 22 at the time of 6, 7, 8 and 9, but the sub-data has the same content within one frame regardless of the segment number.

Therefore, in the present embodiment, the ID data 1, the ID data 2, the sub data 1, and the sub data 2 are included in the sub code in a plurality of consecutive segment numbers (3 or more).

The recorder 22 outputs a recording signal to the rotary heads 2a and 2b so as to record the segmented video signal, the subcode and the tracking signal in different areas in response to the clock output of the clock generator 9.

The rotary head controller 23 synchronizes with the clock output of the clock generator 9 so that the rotary heads 2a and 2a are synchronized with each other.
Controls the rotation speed of the cylinder 3 in which b is mounted.

As a result of the above operation, the track as shown in FIG. 1 is formed on the magnetic tape 1. Here, the detailed structure of the subcode area in one track is shown in FIG.
FIG. 3B shows the detailed configuration of 1SB of the subcode. First, as shown in FIG. 3A, the subcode area in one track consists of 12 SBs (SB0 to SB).
11). As shown in FIG. 3B, 1SB is a sync unit 1.
00, an ID section 110, and a data section 120.
As described above, 2 bytes of the signal indicating the SB recording start position is recorded in the sync unit 100. The ID section 110 is
2 bytes of ID data 111 (1 byte each for ID0 and ID1) and 1 byte of IDP 112 are recorded. That is, 3 bytes are recorded in the ID part 110. Details of the ID data 111 will be described later with reference to FIG. A parity signal is recorded in the IDP 112. This IDP 112 is an ID from the sync unit 100 in the SB.
This is a signal for detecting (and further correcting) an error in reading the signal up to the section 110. By recording the IDP 112 at this position in 1SB, the ID data 111 recorded in ID0 and ID1 can be read if the sync unit 100 to the ID unit 110 can be read. At this time, it is not necessary to read the entire 1SB (from the sync section 100 to the data section 120). This is advantageous for data reproduction when the scanning locus of the rotary head crosses the track on the tape diagonally during high-speed search. Now, in the data section 120, 5 bytes of sub-data 121, DP (D
2 bytes of ATA_PARITY) 122 are recorded.
Details of the sub data 121 will be described later with reference to FIG. A parity signal is recorded in the DP 122. The DP 122 is a signal for detecting (and further correcting) a reading error of the signal from the sync unit 100 to the data unit 120 in the SB. When all the signals from the sync part 100 to the data part 120 can be read,
The sub data of the data section 120 can be read.

4A and 4B and FIGS. 5A and 5B show an example of the contents and arrangement of the ID data 111 and the sub data 121 of the sub code. FIG. 4A shows track number 0,
The case of 1 and 2 is shown. 4B shows the case of track numbers 3 and 4, FIG. 5A shows the case of track numbers 5 and 6, and FIG. 5B shows the case of track numbers 7, 8 and 9. The track number is the same as the segment number, that is, the ID data 1
The contents of 11 are recorded by switching between ID data 1 and ID data 2, and the contents of the sub data 121 are recorded by switching between sub data 1 and sub data 2 in the same manner.

First, track number 0, shown in FIG.
The case of 1 and 2 will be described. In this case, the ID section 11
ID data 1 is recorded as the ID data 111 of 0. Note that ID data 1 is also recorded as ID data in the case of track numbers 7, 8, and 9 (shown in FIG. 5B), which will be described later. In other words, considering the adjacent frames as well, the ID portion of the subcode area is I
D data 1 is recorded. The ID portion of the adjacent track on which the same ID data is recorded is called an ID block. Similarly, a data portion of an adjacent track in which the same sub data is recorded is called a sub data block.

The ID data 111 of the ID data 1 (ID block 1) will be described in the order of head scanning. First, the SB number 113 is recorded in 4 bits. This is the S in the subcode area 26 in one track.
This is for identifying any of B0 to SB11 and is recorded in the ID section 110 of all SBs. For other data, the content of the recorded data differs depending on the SB. First, SB0 and SB11 will be described. In this case, following the SB number, APID 118 of 4 bits and tape counter value TCA 117 of 8 bits are recorded. The tape counter value is represented by 5 bytes, and the upper 8 bits (1 byte) are recorded as the TCA 117 here. As will be described later, the tape counter value is also recorded as the sub data 121 of the data section 120. AP
The ID 118 is ID information that instructs the description content of the ID section 110 and the data section 120. By recording this signal, for example, the contents recorded in the ID part or the data part can be changed between the case of the user tape and the case of the soft tape. Next, SB1 to SB5, SB7 to SB1
1 will be described. In this case, following the SB number,
First, 2 bits of the block identification code 114 are recorded. There are four blocks that can be formed by combining ID data 1 and 2 and sub data 1 and 2 in one frame.
It is for identifying the block. And S
One bit of RID115 is recorded. Further, the program numbers PN2 to PN0 (116) are recorded in 9 bits in total. SRID in all SBs in one frame
115 and program numbers PN2 to PN0 (116) and T
The same CA 117 is recorded.

The block identification code 114 of track numbers 0, 1 and 2 is b'00 ', the block identification code 114 of track numbers 3 and 4 is b'01', and the block identification codes of track numbers 5 and 6. 114 is b'1
0 ', block identification code 1 of track numbers 7, 8 and 9
14 is b'11 '. The SB number 113 is 0 to
11 is recorded.

In the case of track numbers 0, 1 and 2, the sub data 1 is used as the sub data 121 of the data section 120.
Is recorded. In the case of track numbers 3 and 4 described later (shown in FIG. 4B), sub data 1 is recorded as sub data. That is, the sub data 1 is recorded in the data portion of the sub code area continuously for 5 tracks. The data portion of the adjacent track on which the same sub data is recorded is called a sub data block. In this case, since the recorded sub data is sub data 1, it is called sub data block 1. Similarly, the sub data block in which the sub data 2 is recorded is called the sub data block 2.

As the sub data 1, absolute position information and text information are recorded. Here, the absolute time code (ATC12) is used as absolute position information in SB0 to SB5.
3) and the tape counter value (TCB124) are alternately recorded for each SB. The tape counter value TCB124 recorded here is the TCA11 recorded in the ID section.
It is a more detailed value (5 bytes) than 7 (1 byte). As the ATC 123, the elapsed time from the beginning of the tape is recorded and the tape counter value (TCA 117, TCB
As 124), a value corresponding to the number of recording frames (the number of tracks) from the beginning of the tape is recorded. SB6-S
In the data portion 121 of B11, the text information (TXT12
Record 7). The TXT127 can be used in various ways, and is not particularly limited here. Also,
The ATC 123, TCB 124, and TXT 127 are recorded together with the ITEM identification header as required so that the content can be identified by the identification header during reproduction.

Next, track number 3, shown in FIG.
The case of 4 will be described. ID of track numbers 3 and 4
ID data 2 is recorded as ID data 111 in the section 110. Note that ID data 2 is also recorded as ID data in the case of track numbers 5 and 6 described later (shown in FIG. 5A). That is, the ID data 2 is recorded in the ID portion of the subcode area of four consecutive tracks of track numbers 3 to 6. The ID portion of track numbers 3 to 6 is called an ID data block 2.

The ID data 111 (ID block data 2) for recording the ID data 2 will be described in the order of head scanning. First, the SB number 113 is recorded in 4 bits. This is for identifying any of SB0 to SB11 in the subcode area 26 in one track, and is recorded in the ID portion 110 of all SBs. For other data, the content of the recorded data differs depending on the SB. First, SB0 and SB11 will be described. In this case, the API number 118 is 4 bits after the SB number,
Then, the tape counter value TCA117 is recorded in 8 bits. APID 118 and TCA1 recorded here
17 is the same as the case of ID data 1. That is, S
For B0 and SB6, each ID data block (ID
Common data (APID 118 and TCA 117) is recorded in the data block 1 or the ID data block 2). Next, SB1 to SB5 and SB7 to SB11 will be described. In this case, the block identification code 114 is first recorded in 2 bits after the SB number.
Then, the COID 119 is recorded in 10 bits. COI
As D, an ID relating to a skip operation, an ID indicating a section in which a still image is recorded, a TOC ID, etc. are recorded. Here, TOC is a program menu of the video signal recorded on the tape, and TOC ID indicates whether or not the section in which the TOC is recorded. The TOC is usually recorded together with the video signal. COID11
9 has the same contents recorded in all SBs to be recorded in one frame.

Data part 12 for track numbers 3 and 4
The sub data 121 recorded in 0 is track number 0,
Since it is the same as the case of 1 and 2, and the sub-data 1 is recorded, the description thereof is omitted here.

Next, track number 5 shown in FIG.
The case of 6 will be described. ID of track numbers 3 and 4
ID data 2 is recorded as ID data 111 in the section 110. This is the same as the case of the track numbers 3 and 4 shown in FIG. 4B, and the recording of the ID data 2 has already been described.

In the case of track numbers 0, 1 and 2, the sub data 2 is used as the sub data 121 of the data section 120.
Is recorded. In addition, track numbers 7, 8 and 9 described later
In this case (shown in FIG. 5B), sub data 2 is recorded as sub data. That is, the sub data 2 is recorded in the data portion of the sub code area of the continuous 5 tracks of the track numbers 5 to 9 (sub data block 2).

User information is recorded as the sub data 2. Here, description will be made assuming a user tape.
Note that it is also possible to record different contents by distinguishing the user tape and the soft tape by using the APID described above. In the case of the user tape, the recording date (T1 (125)) and the recording time minute second (T2 (126)) are alternately recorded every 1 SB as shown in FIG.
T1 (125) and T2 (126) are ITE if necessary.
It is recorded together with the M identification header so that the content can be identified by the identification header during reproduction. In the case of a soft tape, a chapter number (including a part number) may be recorded instead of the recording date, and a chapter time code may be recorded instead of the recording minute / second.

Next, the track number 7 shown in FIG.
The cases of 8 and 9 will be described. Track numbers 7, 8,
ID data 1 is recorded as ID data 111 in the ID section 110 of 9. This is the same as the case of the track numbers 0, 1 and 2 shown in FIG. Also, the data part 120 of the track numbers 7, 8 and 9
Sub data 2 is recorded as ID data 121 in the
This is the same as the case of the track numbers 5 and 6 shown in FIG.

As described above, if a subcode is attached to a video signal and simultaneously recorded, it can be effectively used at the time of editing or searching.

In this embodiment, the I of the subcode area is
The case where the ID data 1 and the ID data 2 are recorded in the D section and the sub data 1 and the sub data 2 are recorded in the data section is shown, but these are recorded in three or more continuous tracks, respectively. Makes it extremely strong against track thinning due to editing of adjacent tracks. For example, when subdata 2 (user information) is rewritten, it is necessary to rewrite the subcode area of 5 tracks from track 5 to track 9. Further, when rewriting ID data 1, it is necessary to rewrite consecutive 6 tracks, and when rewriting ID data 2, it is necessary to rewrite consecutive 4 track subcode areas.

FIG. 7A is a diagram showing a state in which the subcode areas of both adjacent tracks of a certain track are rewritten. For example, when sub data 1 is recorded only on one track and insert editing is performed on both adjacent tracks, the track on which sub data 1 is recorded is
Both sides of the track get thin and the probability of making a reading error when reading the signal with the rotating head increases,
The reliability of the data is greatly reduced. Figure 7
(B) shows the state of track thinning when three tracks are left and the subcode areas of both adjacent tracks are rewritten. Since both sides of the track are not thinned and at least one track is stored as it is, the subcode can be reproduced and detected without error. In this embodiment, since the ID data 1 and 2 and the sub data 1 and 2 are recorded on four or more continuous tracks, respectively, the same effect can be obtained.

FIG. 6 shows a combination of ID data 111 and sub data 121 recorded in the sub code area of each track. With such a configuration, the ID data 111
(ID data 1 or ID data 2) and sub data (I
The recording function of the VTR can be enhanced by recording the D data 1 or the ID data 2), which will be described in detail later.

In this way, the three continuous lines as in this embodiment are used.
If the ID data blocks are provided over the tracks of three or more and the sub data blocks are provided over three or more continuous tracks, the effect is very large in terms of the reliability of the subcode after the insert editing.

The APID 118 is recorded in SB0 and SB6 of both the ID data blocks 1 and 2 (all tracks). By recording this ID, the information is read during the search and the information arrangement of the subcode is arranged. Can be read. This is the control ID according to the APID when the content or arrangement of the user information is changed according to the APID.
This is effective when the meaning of (COID) is changed.

The TCA 117 is also recorded in SB0 and SB6 of both ID data blocks 1 and 2. In this way, both APID 118 and TCA 117 are recorded in the ID section 110 in the sync block. ID part 11
Those recorded in 0 have a higher detection probability during high-speed search than those recorded in the data section 120. As described above, the data recorded in the ID 110 section may have a shorter reproduction section for reading than the data recorded in the data section 120. Therefore, the detection probability is increased during high-speed search in which reproduction is performed across the tracks. Further, since the APID 118 and the TCA 117 are recorded in the sub-code areas of all tracks, the data detection capability during high speed search is not easily affected by the head scanning phase. The phase mentioned here indicates a phase in which one frame is a cycle. On the other hand, if the data is recorded in a specific track in one frame, the data detection capability during high-speed search may vary depending on the head scanning phase.

Further, in the present embodiment, the upper 8 bits of the tape counter value are recorded as TCA 117 in the ID portions of SB0 and SB6 of the subcode area of each track,
Further, the entire tape counter value (5 bytes in the case of the present embodiment) is set to SB0, SB of the data portion (sub data block 1) of the sub code area of the tracks of track numbers 0 to 4.
2, recorded on SB4. To record the tape counter value in this way, first increase the tape speed and then
By detecting CA117, a rough tape counter value search can be performed. When the tape position approaches the target position, the tape speed is reduced, and the TCB 124 can be detected and moved to the target position. When the tape speed is low, there is almost no difference in detection probability due to the difference between recording in the ID section and recording in the data section. Moreover, if a search is performed using such a tape counter value,
The distance on the tape to the target position can be determined, and the search accuracy can be improved. For example, it is possible to decelerate in advance before the target position, and in that case, the tape overshooting amount during the stop operation can be reduced.

Further, with the track configuration as described above, the ID data 1, the ID data 2, the sub data 1, and the sub data 2 can be edited individually. Here, “editable individually” means that, for example, when performing editing such as rewriting the ID data 1, the ID data 2, the sub data 1, and the sub data 2 can be stored as they are. Of course, other items (ID data 2
The same applies when rewriting the sub data 1 or the sub data 2). If the VTR has such a function, it will be very convenient. For example, the ID data 1 is recorded including a cue ID, but if this cue ID can be inserted at an arbitrary position after recording, it is very effective when searching for a desired scene. is there. However, in this case, other subcode information (APID, COID, absolute position information, user information) needs to be stored. That is, it is a very effective function that the subcode can be edited individually.

Next, the editing operation will be described with reference to FIG. In FIG. 8, 29 is an edit point changeover switch, 30 is a tracking error detector, 31 is a positioning information signal detector, 32 is an edit timing generator, 33 is an edit area indicator, 34 is a segment number detector, and 35 is an ID. Data 1 detector, 36 is ID data 2 detector, 37
Is a sub data 1 detector, and 38 is a sub data 2 detector.

Here, a case where the cue ID (SRID) is recorded on the tape for 5 seconds will be described. That is, ID
Data 1 will be rewritten for 150 frames. Note that, in general, the program number cannot change in the SRID recording section.
If the program number of the section in which D is rewritten is known in advance, there is no problem in rewriting the SRID and the program number at the same time.

Now, in the recorded magnetic tape, ID
When rewriting the data 1, the SB of the subcode area of the track in which the ID data 1 is recorded from a certain timing from the mode in which the magnetic tape is running in the reproducing state.
Will be changed to the mode of rewriting. First 2
The operation common to the two modes will be described. The clock generator 9 produces a signal of 150 Hz, and the rotary head controller 23 controls the rotation speed of the cylinder 3 in which the rotary heads 2a and 2b are mounted so as to synchronize with the clock output of the clock generator 9. As will be described later, when the rotary heads 2a and 2b scan the tracking signal area 28 of the track, the edit point changeover switch 29 is connected to the terminal 29b, and the reproduction signal is transmitted to the rotary head 2
The reproduction state output from a is set. Tracking control is performed by this output signal.

Here, the tracking method will be described. In the tracking signal area 28 of the track recorded by the above-mentioned method, pilot signals of two different frequencies f1 and f2 are frequency-multiplexed and recorded every other track. Here, it is assumed that f0 track, f1 track, f0 track, f2 track, f0 track, f1 track, ... Are recorded in order from the track 24-0. Here, no pilot signal is recorded on the f0 track. Frequency f1 for f1 track
Of the pilot signals are frequency-multiplexed and recorded.
The pilot signal of frequency f2 is frequency-multiplexed and recorded on the f2 track. The tracking is controlled so that the rotary head 2a always scans the f0 track. For example, in FIG. 7, tracking is performed so as to scan the track 24-10. Now, the rotary head 2a moves to the tracking signal area 2 of the track 24-10.
8 scans both adjacent tracks 24-9, 2
Different pilot signal components f recorded in 4-11
The leak components 1 and f2 are included and detected. Tracking error information is detected by the tracking error detector 30 from this signal, and the capstan control circuit 6 controls the capstan motor based on the input tracking error information. Here, the tracking error detector 30
A known detector that compares the magnitude of the f1 component and the magnitude of the f2 component and outputs tracking error information proportional to the difference is used as the detector. Here, the tracking error information always outputs the difference between the pilot component included in the preceding track and the pilot component included in the rear track. For example, when the rotary head 2a is scanning the track 24-10, the track 24
A value proportional to the difference between the pilot component included in the tracking signal region of track -9 and the pilot component included in the tracking signal region of −11 is output. Since the rotary head 2b is arranged very close to the rotary head 2a and the relative positional relationship between the rotary head 2a and the rotary head 2a can be accurately ensured, the rotary head 2a and the track 24-10 are tracked to track the rotary head 2b and the track 24a. Tracking with -11 can also be achieved at the same time.

Now, the operation during the reproduction state before the rewriting of the ID data 1 is started will be described. Tracking is performed by the method as described above, and the reproduction signal from the rotary head 2a is input to the ID data 1 detector 35. The ID data 1 generator 13 creates the same program number as the program number detected by the ID data 1 detector 35.

From this point on, the editing area indicator 3
It is assumed that the ID data 1 is rewritten by the instruction signal from 3. In this case, the edit point switching switch 29 switches between a mode for recording the recording signal created by the recorder 22 and a mode for reproducing the signal from the rotary heads 2a and 2b at a timing determined by a method described later. That is, when scanning the subcode area of the track on which the ID data 1 was recorded, it is a mode for recording a recording signal, and when scanning the other area, a mode for reproducing the signals from the rotary heads 2a, 2b. Becomes

First, the ID data 1 generator 13 creates new ID data 1 by the instruction signal from the editing area indicator 33. However, APID118, TCA11
7. Regarding the program numbers PN2 to PN0 (116), the previously recorded information must be saved. Of these, the method for creating the program number has already been described. When the ID data 1 is rewritten, a signal is newly recorded only when the head scans the subcode areas of the tracks having track numbers 0, 1, 2, 7, 8, and 9. The method for determining this timing will be described later.
Therefore, when the head scans the subcode areas of the tracks of track numbers 3 to 6, it is in the reproducing state, so that the data on the tracks can be read. APID
Regarding TCA and TCA, the same contents are recorded in sub data 2. So, track 3 one frame before
~ 6 is the ID of the APID and TCA that are reproduced while the head is scanning, or is converted by the equivalent of one frame
It is possible to record it by including it in the data 1. At this time, the ID data 2 detector 36 and the ID data 1 generator 13
APID and TCA are created by and.

As described above, the editing area indicator 33, ID data 1 detector 35, ID data 2 detector 36 and I
New ID data 1 is created by the D data 1 generator 13. The created ID data 1 is the synthesizer 1
9 is input.

Now, when rewriting the ID data 1 of the ID part of each sync block of the subcode areas recorded in the tracks 0, 1, 2, the subdata 1 (absolute position) recorded in the data part of the same sync block is written. (Information) also needs to be rewritten at the same time. However, the sub-data 1 must retain the previously recorded data. Here, the same sub-data 1 is recorded on tracks 3, 4 in addition to tracks 0, 1, 2. Therefore, the sub-data 1 recorded on the tracks 0, 1 and 2 can be created by converting the sub-data 1 obtained by reproducing the tracks 3 and 4 one frame before by one frame.

I recorded on tracks 7, 8 and 9
When the D data 1 is rewritten, it is necessary to rewrite the sub data 2 (user information) recorded in the data section in the same sync block at the same time. However, the sub data 2 must retain the previously recorded data. Here, the same sub data 2 is recorded not only on the tracks 7, 8 and 9 but also on the tracks 5 and 6. Therefore, the sub data 2 recorded on the tracks 7, 8 and 9 is the same as the sub data 2 obtained by reproducing the tracks 5 and 6 in the same frame, and it is easy to create.

Here, the new sub data 1 is created by the sub data 1 detector 37 and the sub data 1 generator. Further, new sub data 2 is created by the sub data 2 detector and the sub data 2 generator. The created sub data 1 and sub data 2 are input to the combiner 19.

Since the ID data 2 is not rewritten here, details of the creation of the ID data 2 will not be mentioned.

The synthesizer 20 includes a segment number detector 34.
Depending on the segment number detected by
D data 1 or 2 and sub data 1 or 2 are combined. Here, the segment number detector 34 is the rotary head 2
The segment number (track number in one frame) included in the video signal in the video signal area 25 is detected by demodulating the reproduced signals from a and 2b. For example, in FIG. 8, the segment number of track 24-10 is 0. Also, the segment number detected is the segment number one scan before, and since 2ch simultaneous recording is being performed, the same head as the track currently being scanned is 1
The segment number differs by 2 from the track before scanning. Then, judging from the segment number one scan before detected by the segment number detector 34, if the segment numbers of the track currently being scanned are 0, 1, 2, the synthesizer 20 determines the sync, the ID data 1 and the sub data. Data 1 is synthesized and output. Similarly, if the segment numbers of the track currently being scanned are 3 and 4, the sync, the ID data 2 and the sub data 1 are combined and output. If the segment numbers of the track currently being scanned are 5 and 6, the sync, the ID data 2 and the sub data 2 are combined and output. If the segment number of the track currently being scanned is 7, 8 or 9, the sync, ID data 1 and sub data 2 are combined and output.

The signal output from the synthesizer 20 is recorded in the recorder 2.
Entered in 2. The recorder 22 includes rotary heads 2a and 2b.
In accordance with the clock output of the clock generator 9 which is the control reference of the edit signal, a recording signal for recording the index signal in the index area is used as the edit point changeover switch 29.
Output to. A recording current is created by such an operation.

The subsequent operation will be described with reference to FIGS. 9 and 10. The edit area indicator 33 outputs a signal instructing to rewrite the ID data 1. That is,
When the segment numbers are 0, 1, 2, 7, 8 and 9, a signal instructing to rewrite the subcode area is input to the edit timing generator 32. The instruction signal is output for 5 seconds (equivalent to 150 frames).

The edit point changeover switch 29 is the terminal 29b.
While being connected to, the signal from the rotary head 2a is separately input to the positioning information signal detector 31. Then, the positioning information signal detector 31 detects the positioning information signal recorded in the positioning information signal area 27, which is a part of the tracking signal area on the track, and determines the position of the positioning signal as shown in FIG. Generate a pulse signal to represent. This pulse signal is input to the edit timing generator 32.

The segment number detector 34 detects the segment number (track number within one frame) included in the video signal in the video signal area 25 by demodulating the reproduction signal. The detected segment number is input to the edit timing generator 32.

In order to rewrite the index area of a specific track in one frame, the track (segment) number to be rewritten and the start position and end position on the track must be specified. The edit timing generator 32
Based on the output signal of the editing area indicator 33, the output pulse signal of the positioning information signal detector 31, and the output segment number of the segment number detector 34, a timing signal for switching the connection of the edit point changeover switch 29 between the terminals 29a and 29b is provided. create. Next, the operation of the edit timing generator 32 will be described in detail.

The output signal of the edit area indicator 33 and the output signal of the segment number detector 34 are input to the comparison calculator 32a of the edit timing generator 32. Then, the comparison calculator 32a detects the track number to be tracked in the next head scan from the output of the segment number detector 34. If the track number matches the track number input from the editing area indicator 33, the comparison calculator 32a sets the output Trs to Trs = ”.
If it does not match H ", Trs =" L "is set. Here, since the segment number detector 34 detects the segment number included in the video signal recorded in the video signal area 25, the rotation is performed. The segment number held when the head 2a is scanning the sub-code area 26 or the tracking signal area 28 is the segment number at the time of the previous scanning.

The output pulse signal of the positioning information signal detector 31 is input to the first delay circuit 32b and the second delay circuit 32c. Each delay circuit starts counting internal clocks of the present magnetic recording / reproducing apparatus shown in FIG. 10A, and counts internal clocks corresponding to the prescribed delay times t1 and t2 to generate delay signals of each delay circuit. . Then, those signals are converted into RS-FF (Flip
Flop) 32d is input as shown in FIG. 9 to generate a subcode edit timing signal as shown in FIG. This sub-code edit timing signal is supplied to the AND circuit 32e together with the output Trs of the comparison calculator 32a.
Is input to the edit point changeover switch 29 as an ID data 1 edit timing signal.

Only when the cueing code edit timing signal created as described above is "H", the edit point changeover switch 29 is changed over from the terminal 29b to the terminal 29a, and a new recording signal is added to the rotary head 2a. And I
New ID data 1 is written in the subcode area of the track in which D data 1 is recorded.

A recording current is created by the method described above,
By determining the timing of rewriting, in the embodiment of the present invention, insert editing in which the ID data 1, the sub data 1, and the sub data 2 are saved and the ID data 1 is rewritten can be performed.

Similarly, it is possible to rewrite the ID data 2 (especially COID) while storing the ID data 1, the sub data 1, and the sub data 2. Now
It is assumed that the ID data 2 generator 14 creates desired ID data 2. In this case, the difference from the case of rewriting the ID data 1 is that the track to be rewritten (that is,
(Rewriting the subcode areas of tracks 3 to 6), a method of creating subdata 1 to be recorded on tracks 3 and 4, and a method of creating subdata 2 to be recorded on tracks 5 and 6.
The sub data 1 recorded on the tracks 3 and 4 may be the same data as the sub data 1 which can be detected during reproduction of the tracks 0, 1 and 2 of the same frame. Also, track 5,
The sub data 2 to be recorded in 6 may be created by converting the sub data 2 that can be detected during reproduction of the tracks 7, 8 and 9 one frame before by one frame worth. Also, for changing the track to be rewritten,
The operation principle is the same except that the rewriting track number designated by the output signal of the editing area indicator 33 is changed.

Consider a case where only the sub data 2 (user information) is rewritten while the ID data 1 and 2 and the sub data 1 are stored. Now, it is assumed that the sub data 2 generator 16 generates desired sub data 2. In this case, I
The difference from the case of rewriting only D data 1 is the method of creating the recording current and the rewriting track number designated by the output signal of the editing area indicator 33. Here, the rewriting track number is different from the case of rewriting the ID data 1, but since the operation principle is the same, detailed description will be omitted. The output signal of the edit area indicator 33 only inputs to the edit timing generator 32 a signal instructing to rewrite the subcode area when the track number (segment number) is 5 to 9. The recording current may be created as long as the ID data 1 and ID data 2 input to the combiner 20 are the same as the previously recorded data. ID data 1 recorded on tracks 7, 8 and 9 is an ID that can be detected during reproduction of tracks 0, 1 and 2 in the same frame.
The data may be the same as the data 1. Tracks 5,6
The ID data 2 to be recorded in 1 may be the same data as the ID data 2 which can be detected during reproduction of the tracks 3 and 4 in the same frame. The ID data 1 is actually created by the ID data 1 detector 35 and the ID data 1 generator 13. ID data 2 includes ID data 2 detector 36 and ID
It is created by the data 2 generator 14. As described above, only the sub data 2 (user information) can be rewritten while the ID data 1 and 2 and the sub data 1 are stored.

As shown above, the ID in the tape traveling direction
If the boundaries of the data blocks 1 and 2 and the boundaries of the sub data blocks 1 and 2 are deviated, I
It is possible to individually edit the D data 1, the ID data 2, or the sub data 2. Particularly, the sum of the number P1 of constituent tracks of the ID data block 1 and the number P2 of constituent tracks of the ID data block 2 is equal to the sum of the number of constituent tracks Q1 of the sub data block 1 and the number of constituent tracks Q2 of the sub data block 2 (P1 + P2 = Q1 + Q2) In this case, preferable editing becomes possible. In this embodiment, P1 + P
The case where 2 = Q1 + Q2 = 10 is shown. At this time, the pattern of the combination of the recorded ID block and sub data block is completed in 10 track cycles. For example, when rewriting the ID data, it is necessary to save the sub data recorded in the same sync block. Therefore, if the ID data block and the sub data block are configured as in the present embodiment, the same data as the sub data to be stored can be arranged in the sub code area of the track that is not rewritten, and further, its position. (Track number) will also be clear. Therefore, even if the ID data is rewritten, the sub data in the sync block can be stored. Similarly, even if the sub data is rewritten, the ID data in the sync block can be stored. That is, according to this embodiment, it is possible to realize a recording / reproducing method having an advanced editing function.

In the present embodiment, an example of simultaneous recording of 2 channels is shown, but the combination and arrangement of the rotary heads are not limited to this embodiment and can be similarly applied in other cases.

Further, in the present embodiment, an example in which the subcode area is provided between the tracking signal area and the video signal area has been shown, but the location on the track where the subcode area is provided is not limited. For example, it may be provided in the second half of the track after the video signal area as viewed in the head scanning direction, and it goes without saying that these are included in the present invention.

In this embodiment, the case where a video signal of 30 frames per second is created is shown, but the number of frames is not limited. Further, although the case where a video signal of one frame is divided into 10 segments and recorded on 10 tracks is shown, the number of divided segments is not limited.

Further, although the case of the apparatus for recording the video signal is shown in the present embodiment, the same effect as that of the present embodiment can be obtained in the case of recording also including the audio signal, which is included in the present invention. It goes without saying that it will be done.

In this embodiment, there are two types of tracking pilot signals, but it is 8 mmVT.
It is also possible to use pilot signals of four types of frequencies used in R, and it is also possible to use a method of recording a plurality of types of pilot signals by changing the recording location of pilot signals such as DAT. It is not limited to how to put.

In this embodiment, the tracking control is performed by using the pilot signal frequency-multiplexed in the tracking signal area at the head of the track. However, only the positioning information signal at the time of editing is recorded in the tracking signal area. For tracking control, V of the conventional VHS method is used.
The control using the control signal recorded in the linear track at the end of the tape as in TR may be performed.

[0084]

As is apparent from the above description, according to the recording / reproducing method of the present invention, it is possible to record a plurality of items as subcodes and to edit each item individually. . Further, it is resistant to track thinning due to overwriting at the time of editing, and further has improved high-speed search function. If the recording / reproducing method of the present invention is used, a VTR having an extremely advanced editing function, etc. The recording / reproducing method of can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a recording operation of a magnetic recording / reproducing apparatus in an embodiment to which a recording / reproducing method of the present invention is applied.

FIG. 2 is a layout diagram of a rotary head on a cylinder.

FIG. 3 is a configuration diagram of a subcode area according to an embodiment of the present invention.

FIG. 4 is a diagram showing detailed contents and arrangement of an ID part and a data part for each sync block of a subcode area of each track in an embodiment of the present invention.

FIG. 5 is a diagram showing detailed contents and arrangement of an ID part and a data part for each sync block in a subcode area of each track in an embodiment of the present invention.

FIG. 6 is a diagram showing contents and arrangements of an ID part and a data part of a subcode in one embodiment of the present invention.

FIG. 7 is a diagram showing an example of a track thinning state that occurs during insert editing.

FIG. 8 is a diagram showing an operation during insert editing of the magnetic recording / reproducing apparatus in one embodiment to which the recording / reproducing method of the present invention is applied.

9 is a block diagram showing an example of the edit timing generation means shown in FIG.

FIG. 10 is a time chart of each signal during insert editing in the embodiment of the present invention.

[Explanation of symbols]

 1 Magnetic Tape 2a, 2b Rotating Head 3 Cylinder 4 Capstan Motor 5 Pinch Roller 6 Capstan Control Circuit 7 Tape Running Device 8 Video Signal Generator 9 Clock Generator 10 Segmenting Circuit 11 Frame Sync Signal Generator 12 Tracking Signal Generator 13 ID data 1 generator 14 ID data 2 generator 15 Sub data 1 generator 16 Sub data 2 generator 17 Sync generator 20 Combiner 21 Index generator 22 Recorder 23 Rotating head controller 24-0 to 24-9 Track 25 Video signal area 26 Sub-code area 27 Positioning information signal area 28 Tracking signal area

Claims (4)

[Claims] 1. A subcode area having N (where N is an integer of 1 or more) sync blocks is provided in a part of an inclined track on a tape, and the sync blocks are a sync section, an ID section and a data section. A recording / reproducing method in which the ID part includes ID data, and the data part includes sub-data, wherein P1 (where P1 is an integer of 2 or more) adjacent to each other in the tape traveling direction. Across tracks over I
A first ID data block in which the D data portion is recorded with the same or almost the same content, and an ID data portion between tracks across P2 (where P2 is an integer of 2 or more) adjacent slope tracks in the tape traveling direction. At least 2 when viewed in the tape traveling direction, including the second ID data block in which the other ID is recorded with the same content or almost the same content.
Forming the ID data blocks of a kind, and recording sub data portions between tracks with the same content or almost the same content across adjacent Q1 (where Q1 is an integer of 2 or more) inclined tracks in the tape traveling direction. A second sub-data block having one sub-data block and another sub-data portion between the tracks, which are adjacent to each other in the tape advancing direction and are Q2 in number (where Q2 is an integer of 2 or more), have the same or almost the same content. At least 2 when viewed in the tape traveling direction, including the sub data block of
Forming at least one boundary of the ID data blocks in the tape moving direction with respect to the boundary of the sub data blocks, and each ID data block has common data and is unique to each block. The recording and reproducing method is characterized in that the data of and is recorded. 2. The recording / reproducing method according to claim 1, wherein code information for block identification of the ID data block and the sub data block is recorded in at least one of the ID data and the sub data. 3. The same contents are recorded on tracks in each ID data block except for code information for block identification.
The recording / reproducing method according to claim 2, wherein the same content is recorded on the tracks in each sub-data block. 4. The recording / reproducing method according to claim 1, wherein P1, P2, Q1 and Q2 are all integers of 3 or more.