JP3063470B2 - Recording / playback method - Google Patents

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, data and the like on a tape together with subcodes, and reproducing the recorded information. And a recording / reproducing method. Here, the editing is a change in 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 A recording and reproducing apparatus using a tape as a medium, such as a video tape recorder (hereinafter abbreviated as VTR), has been put into practical use and spread. Further, development of miniaturization and digitalization of the device by further higher density recording is being performed. Usually, when an information signal is recorded, it is recorded including a subcode. Here, the subcode is a code attached to the information signal, such as a cueing ID indicating a data recording start position, an absolute time code indicating an absolute position on the tape, and a user time code determined by a user. As an example of recording such a subcode, DAT (Digital Audio
Tape recorder), 8mVTR and the like. DA
It is well known that in the standards of T and 8 mm VTR, it is possible to edit such that only the subcode is re-recorded while keeping the recorded video signal or audio signal.

[0003] Among sub-codes, the use of the editing function of the cue ID is high. Here, a recording method of the cueing ID will be described. For example, it is assumed that the cue ID is set and recorded at a desired position on the tape for 9 seconds. In addition,
The set recording time of the cue ID is determined in consideration of the detection capability at the time of high-speed search, and naturally, the longer the recording time, the higher the detection capability. In particular, when the cueing ID is recorded on a part of the inclined track, the tendency is remarkable. Then, it is assumed that information that requires a new cueing is recorded in the middle of the cueing ID set recording section (for example, a position four seconds after the start of the cueing ID set recording). Let's consider an editing operation in which a new cueing ID is set and recorded for 9 seconds. In this case, in the conventional method, the cueing ID is set and recorded continuously for a total of 13 seconds by performing set recording for 9 seconds in addition to 4 seconds. As a result, the newly recorded cue I
There is a problem that the exact set recording start position of D cannot be determined. Therefore, when rewriting the set of the cue ID, the set recording is performed after the reset recording of the predetermined section. If you do so, the cueing ID after rewriting
Can also be determined. FIG. 11 shows the cue ID recorded on the tape after rewriting when such rewriting is performed. This figure shows a case where the cueing ID has been previously set and recorded in the section L20, and thereafter, the cueing ID has been reset recorded in the section L22 and set and recorded in the section L23. If the cue ID is rewritten in this manner, the cue I
Both the set recording start positions P21 and P22 of D can be identified.

[0004]

Generally, the point P
If you want to delete the cue ID for cueing 22
The section set and recorded in the section L23 may be reset and rewritten. However, when such rewriting is performed, the ID for locating the point P21 is only set in the section L21. Here, when the section L21 is short, the performance of the search function for searching for the start point P21 is greatly deteriorated. This is because, as described above, the detection probability at the time of the high-speed search greatly depends on the set recording time.

[0005] An object of the present invention is to provide a method in which a set section of cue information for cueing another point exists in a predetermined section before a cue information recording section to be erased. An object of the present invention is to provide a recording / reproducing method devised so that the cueing ability of the point does not deteriorate.

[0006]

In order to solve the above-mentioned problems, a recording / reproducing method according to the present invention provides a recording / reproducing method in which a subcode area for recording cue information is provided in a part of an inclined track on a tape. The method for cueing , wherein the cue information is a cue
Set recording section indicating the section to be
Any of the reset recording sections that indicate sections that are not targeted
The set recording section is longer than a predetermined length.
A first set recording section having a recording section of
The second set recording section having a shorter recording section
Indicates the state of the first set recording section or the previous
When you erase the serial second set recording interval, erased
The first set recording section or the second set to be erased
For the recording <br/> starting position of the erasure target set recording interval is set recording area in front of the predetermined section to detect the presence or absence of the set recording <br/> interval, the set recording interval is detected If <br/>, the erased and said detected set recording interval
The present invention is characterized in that the reset recording section existing between the set recording section and the set recording section is set and rewritten.

[0007]

According to the present invention, even when a set section of cueing information for cueing another point exists in a predetermined section before a cueing information recording section to be erased, The set recording section of the cueing information for cueing the point is stored with a length sufficient for high-speed search.

[0008]

FIG. 1 is a diagram showing a recording operation of a magnetic recording / reproducing apparatus to which the recording / reproducing method of the present invention can be applied. In FIG. 1, 1 is a magnetic tape, 2a and 2b are rotary heads attached to cylinders (not shown), and 24_0 to 24_2.
4_9 are tracks formed on the magnetic tape 1, respectively. Reference numeral 7 denotes a tape traveling unit, which includes a capstan motor 4, a pinch roller 5, and a capstan control circuit 6. 8 is a video signal generator, 9 is a clock generator, 10 is a segmentation circuit, 11 is a frame synchronization signal generator, and 12 is a tracking signal generator. 2
1 is a subcode generator, which is an ID data 1 generator 1
3, ID data 2 generator 14, sub data 1 generator 1
5, a sub data 2 generator 16, a sink generator 17, and a synthesizer 20. Further, 22 is a recorder, 23
Is a rotary head controller. In this embodiment, the rotary head 2
This is an example in which two tracks are recorded and reproduced almost simultaneously by a and 2b. FIG. 2 is a diagram showing an arrangement of the rotary head on the cylinder in the present embodiment, and 3 is a cylinder.

In each track on the magnetic tape in FIG. 1, a positioning signal area 27 is provided in a part of a tracking signal area 28 formed at the head of the track, and a positioning signal is recorded. As this positioning signal, a relatively high frequency that is hardly affected by the adjacent track is selected. In the tracking signal area 28, a tracking pilot signal is frequency-multiplexed and recorded. This pilot signal is alternately provided at every other track at two different frequencies f1, f2, f1, f2, f1,
f2,... are recorded. As the frequencies of the two types of pilot signals, relatively low frequencies that are not easily affected by the azimuth loss of the rotary heads 2a and 2b are selected. 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 runs 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 generates a signal corresponding to 30 frames per second (one frame is one screen of a television). The segmenting circuit 10 converts one frame signal into one signal.
Divide into 0 segments. Finally, one frame of the video signal is divided into ten tracks and recorded. The segmented video signal (segmented video signal) is input to the recorder 22 including the segment number.

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

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

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

The ID data 1 generator 13 generates ID data 1 including a block identification code, a cue ID (hereinafter abbreviated as SRID), and a program number. Detailed contents will be described later. The ID data 1 is input to the synthesizer 20.

The ID data 2 generator 14 generates ID data 2 including a block identification code, an application ID (hereinafter abbreviated as APID), 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, absolute time code, etc.). Detailed contents will be described later. The sub data 1 is input to the synthesizer 20.

The sub-data 2 generator 16 generates sub-data 2 including user information (recording date, recording time, minute, second, etc.).
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,
It is recorded in two small areas. This small area is hereinafter referred to as a sync block (SB). 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 in the frame number (0
To 9). Then, the combination of the ID data and the sub data input to the recorder 22 is switched according to the segment number. Specifically, if the segment number is 0,
When the segment number is 1 or 2, the subcode obtained by synthesizing 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 obtained by synthesizing the sync signal, the ID data 2 and the sub data 1 is used. When the number is 5 or 6, the subcode obtained by combining the sync signal, the ID data 2 and the sub data 2 is used. When the segment number is 7, 8 or 9, the sub code obtained by combining the sync signal, the ID data 1 and the sub data 2 is used. 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 at 1, 2, 7, 8, and 9, but the ID data has the same contents in 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 the time of 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,
The data is input to the recorder 22 at the time of 1, 2, 3, and 4. However, the sub data has the same contents 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 6, 7, 8, and 9, but the sub-data has the same contents in 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 continuous (4 or more) segment numbers.

The recorder 22 outputs a recording signal to the rotary heads 2a and 2b in accordance with the clock output of the clock generator 9 so that the segmented video signal, the subcode and the tracking signal are recorded in different areas.

The rotary head controller 23 controls the rotary heads 2 a and 2 so as to synchronize with the clock output of the clock generator 9.
b controls the rotation speed of the cylinder 3 on which the b is mounted.

As a result of the above operation, a track as shown in FIG. 1 is formed on the magnetic tape 1. Here, the detailed configuration of the subcode area 26 in one track is shown in FIG.
FIG. 3A shows a detailed configuration of one SB of the subcode in FIG.
(B). First, as shown in FIG. 3A, the subcode area in one track is composed of 12 SBs (SB0 to SB11). As shown in FIG. 3B, one SB is composed of a sink unit 100, an ID unit 110, and a data unit 12.
It consists of zero. As described above, the sync unit 100 records a 2-byte signal indicating the SB recording start position. In the ID section 110, the ID data 111 is 2 bytes (I
(D0 and ID1 are each 1 byte), IDP112 is 1
Recorded in bytes. That is, the ID section 110 is recorded with 3 bytes. Details of the ID data 111 will be described later with reference to FIG. The IDP 112 records a parity signal. The IDP 112 is a signal for detecting (and correcting) a reading error of a signal from the sink unit 100 to the ID unit 110 in the SB. 1SB
By recording the IDP 112 at this position, if the data from the sink unit 100 to the ID unit 110 can be read,
The ID data 111 recorded as D0 and ID1 can be read. At this time, the entire 1SB (sink unit 1
It is not necessary to read (from 00 to the data section 120).
This is advantageous for data reproduction when the scanning trajectory of the rotary head obliquely crosses a track on the tape, such as during a high-speed search. By the way, in the data section 120, the sub data 1
21 is 5 bytes, DP (DATA_PARITY) 12
2 is recorded in two bytes. Details of the sub data 121 will be described later with reference to FIG. A parity signal is recorded in DP122. The DP 122 is a signal for detecting (and correcting) a reading error of a signal from the sink unit 100 to the data unit 120 in the SB. When the signal from the sink unit 100 to the data unit 120 is read, the sub data of the data unit 120 can be read.

FIG. 4 shows the contents and arrangement of the ID data 111 and the sub data 121 of the subcode. The track number in FIG. 4 is the same as the segment number, that is, in the recorded track, I
The contents of the D data 111 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 track numbers 0, 1, 2, 7, 8, and 9, ID data 1 is recorded as ID data. Although it is divided within one frame, considering the adjacent frames, the ID portion of the subcode area is
D data 1 is recorded. Here, the ID part of the adjacent track where the same ID data is recorded is called an ID block. Similarly, a data portion of an adjacent track on which the same sub data is recorded is called a sub data block.

The ID section 110 in which ID data 1 is recorded (ID block 1) will be described in the order of head scanning. First, 4 bits of SB number 113 are recorded. This corresponds to SB0 to SB0 in the subcode area 26 in one track.
This is for identifying any one of SB11. Next, two bits of the block identification code 114 are recorded.
As is apparent from FIG.
There are four types of blocks that can be formed by combining data 1 and 2 and sub data 1 and 2. This is for identifying the block. Then, one bit of the SRID 115 is recorded. Further, program numbers PN2 to PN0 (11
6) is recorded with a total of 9 bits. In one frame, the SRID 115 and the program numbers PN2 to PN0
In (116), the same item is recorded.

The block identification code 114 for the track numbers 0, 1, and 2 is b'00 ', and the block identification code 114 for the track numbers 7, 8, and 9 is b'11'. Further, 0 to 11 are recorded as the SB number 113.

ID part 11 for track numbers 3, 4, 5, and 6
In ID 0, ID data 2 is recorded as ID data 111 (ID block 2). Describing in the order of head scanning, first, 4 bits of SB number 113 having the same meaning as in ID data 1 are recorded. Next, similarly, the block identification code 11 having the same meaning as that of the ID data 1
4 is recorded in two bits. Then, the next two bits 117
Records b'00 '. And APID118
Are recorded in 2 bits, and the COID 119 is recorded in 6 bits. The APID 118 is ID information that indicates the description contents of the ID section 110 and the data section 120. By recording this signal, for example, the content recorded in the ID section or the data section can be changed between a user tape and a soft tape. Further, as the COID, an ID relating to a skip operation, a TOC ID, and the like are recorded. Here, TOC is a program menu of a video signal recorded on the tape, and TOC ID indicates whether or not the section is where TOC is recorded. The TOC is usually recorded together with the video signal. The same APID 118 and COID 119 are recorded in one frame. The block identification signal 114 for the track numbers 3 and 4 is b'01 ', and
The block identification code 114 of No. 6 is b'10 '. Further, 0 to 11 are recorded as the SB number 113.

Next, the sub data 121 of the data section 120
Will be described. Data part 12 of track numbers 0 to 4
In 0, absolute position information (sub data 1) is recorded as sub data (sub data block 1). In the data sections 120 of the track numbers 5 to 9, user information (sub data 2) is recorded as sub data (sub data block 2). FIG. 5 shows the arrangement and contents of the sub data 121. In FIG. 5, the sub data 12 of the data section 120 to be recorded in each SB of the sub code area 26 is shown.
Only 1 is shown. In the track numbers 0 to 4, an absolute time code (ATC123) and a tape counter value (TC124) are alternately recorded for each SB as absolute position information. Track numbers 5 to 9 have the recording date (T1 (1
25)) and the recording hour, minute, second (T2 (126))
Record alternately for each B. However, ATC123, TC
124, T1 (125), and T2 (126) are recorded together with an ITEM identification header as necessary, so that the content can be identified by the identification header during reproduction.

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

Further, as shown in this embodiment, the subcode area 26 in one track is divided into a plurality of (12 in this embodiment) sync blocks (SBs), ID data 11 of ID section 110
1 is recorded with the block identification code 114 included. By recording this block identification signal 114 in all the sync blocks, the content of the data in the sync block can be read at the time of the search in which the sync block of the subcode is detected across the track. Therefore, a high-speed search for sub-codes becomes possible.

The ID data block 2 contains the APID
Although 118 is recorded, by recording this ID, it is possible to read the information during the search and read the information arrangement of the subcode. This is effective when the content or arrangement of the user information is changed according to the APID, or when the meaning of the control ID (COID) is changed according to the APID.

The block identification code 114 and the API
D118 is recorded in the ID section 110 in the sync block. The one recorded in the ID part 110 has a higher detection probability at the time of high-speed search than the one recorded in the data part 120. As described above, the data recorded in the ID section 110 may have a shorter playback section for reading than the data recorded in the data section 120. Therefore, the detection probability at the time of high-speed search for reproducing data across tracks is increased.

Further, if the track configuration as described above is employed, the ID data 1, ID data 2, sub data 1, and sub data 2 can be individually edited. Here, being individually editable means that, for example, when editing is performed such that ID data 1 is rewritten, ID data 2, sub-data 1, and sub-data 2 can be saved as they are. Of course, other items (ID data 2
The same applies to the case where the sub data 1 or the sub data 2) is rewritten. If the VTR has such a function, it becomes very convenient. The cueing ID and the program number are recorded as ID data 1. If this cueing ID can be inserted at an arbitrary position after recording, it is very effective in searching for a scene to be viewed. . Conversely, the cueing ID recorded at an unnecessary location must be able to be deleted at any time. However, in this case, other subcode information (APID, C
OID, absolute position information, user information) must be stored. That is, the ability to individually edit subcodes is a very effective function.

Next, the editing operation of erasing (reset rewriting) of the cue ID will be described with reference to FIG. In FIG. 6, 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 indicator,
34 is a segment number detector, 35 is an ID data 1 detector, 36 is an ID data 2 detector, 37 is a sub data 1 detector, and 38 is a sub data 2 detector.

Here, as shown in FIG.
It is assumed that the ID is recorded. In FIG. 7, a section L1 is an SRID set section for locating the point P1 and is 60 frames, a section L2 is a reset section and 10 frames, and a section L3 is an SRID set section for locating the point P4. 150 frames. Here, the process of recording the SRID as shown in FIG. 7A will be briefly described. Normally, the SRID is recorded over a predetermined length from a position where cueing is desired.
Here, it is assumed that the SRID for locating the point P1 has been recorded 150 frames (equivalent to 5 seconds) from the point P1. Thereafter, in order to newly locate the point P4, reset recording is performed in the section L2 and then set recording is performed in the section L3, and the state is as shown in FIG. 7A. Note that the reset recording section L2 may be shorter than the normal set recording section L3, and the following description will be made on the assumption that the reset recording section is 10 frames.

If the SRID is rewritten as described above, it is possible to find both the points P1 and P4. A case will be described in which information for locating the point P4 is erased from the tape recorded in this manner.

First, the outline of the operation will be described. (1) Rewinding of Tape and Detection of SRID Set Recording Section It is assumed that the editing operation starts from point P5. First, a tape rewinding operation is performed. However, the SRID from the reproduction signal is detected while rewinding. This detection operation is performed from the point P4 to a position 15 frames before. Here, an example in which the SRID is detected from the point P4 to a position 15 frames before is shown, but the length of the section to be detected needs to be determined according to the length of the reset recording section L2 at the time of set rewriting. is there. It is preferable to detect over a section slightly longer than the length of the reset recording section L2. Then, when it is detected that the SRID switches from the reset section to the set section, the vehicle is further driven for 15 frames and then stopped at the point P2.
The case where it is not possible to detect that the SRID switches from the reset section to the set section in the section from the point P4 to the position 15 frames before will be described later. (2) Tape Reproduction The tape is reproduced and the data of the subcode area required when rewriting the SRID is detected. (3) SRID reset recording SRI is performed in the section L2 from the point P3 to the point P4.
Set and record D.

By performing the above operations, the operation shown in FIG.
The SRID as shown in (c) is recorded.
Next, the operations (1) to (3) described above will be described in detail. (1) Rewinding of Tape and Detection of SRID Set Recording Section Assume that at point P5, the editing indicator 33 recognizes that information for locating the point P4 is deleted by an external input. The edit indicator 33 instructs to connect the edit point changeover switch 29 to the terminal 29b. The clock generator 9 generates a signal of 150 Hz, and the rotary head controller 23 controls the clock generator 9.
Rotating heads 2a and 2b so as to synchronize with the clock output of
Controls the rotation speed of the cylinder 3 on which the is mounted. Since the edit point changeover switch 29 is connected to the terminal 29b, a reproduction signal is output from the rotary head 2a.

At the same time, the edit indicator instructs the capstan control circuit 6 to perform a tape rewind operation. Generally, it is sufficient to rewind at a speed higher than the tape speed at the time of recording or reproduction. Then, while rewinding, the information of the subcode area recorded on the tape is reproduced, and the ID data 1 detector 35 outputs the SRID and the sub data 1 detector 3
7 detects absolute position information. Then, by detecting the SRID, it is possible to detect the point P4 (the point at which the SRID switches from the set section to the reset section). Then, the detection of the SRID is continued for 15 frames from the point P4. The management of the number of frames at this time is performed based on absolute position information that can be detected by the sub data 1 detector 37. In the case described here, SRI is performed during rewinding for 15 frames.
A point P3 at which D switches from the reset section to the set section is detected. After that, continue rewinding and point P
Stop at the point P2 where the frame is rewound by 15 frames from 3. The rewind amount from the point P3 at this time is also managed by the absolute position information. In this case, the rewind amount from the point P3 is set to 15 frames. However, the rewind amount is set so that the tracking pull-in is completed while the tape runs during a later reproducing operation, and data is reproduced at least one frame or more. It only needs to be long enough.

After stopping at the point P2, the operation (2) is performed. (2) Tape playback The capstan control circuit 6 performs tracking control by the edit indicator 33, and is instructed to run the tape.

Here, a tracking method will be described. In the tracking signal area 28 of the track recorded by the above-described 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 sequentially recorded from track 24_0. Here, no pilot signal is recorded on the f0 track. The f1 track has the frequency f1
Are frequency-multiplexed and recorded.
In the f2 track, a pilot signal of frequency f2 is frequency-multiplexed and recorded. The tracking is controlled so that the rotary head 2a always scans the f0 track. For example, in FIG. 6, tracking is performed so as to scan the track 24_10. Now, the rotating head 2a is in the tracking signal area 2 of the track 24_10.
8 is scanned, its adjacent tracks 24_9, 2
4_11 different pilot signal components f
The leak components 1 and f2 are detected. Tracking error information is detected from this signal by the tracking error detector 30, and the capstan control circuit 6 controls the capstan motor based on the input tracking error information. Here, the tracking error detector 30
A well-known detector that compares the magnitude of the f1 component with the magnitude of the f2 component and outputs tracking error information proportional to the difference is used. 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 following track. For example, when the rotating head 2a scans the track 24_10,
A value proportional to the difference between the pilot component included in the tracking signal area of the track 24_9 and the pilot component included in the tracking signal area of the track _11 is output. Since the rotary head 2b is disposed very close to the rotary head 2a and can accurately maintain the relative positional relationship with the rotary head 2a, by performing tracking between the rotary head 2a and the track 24_10, the rotary head 2b Tracking can also be achieved at the same time.

Tracking is performed as described above,
The reproduced signal from the rotary head 2a is an ID data 1 detector 3
5 is input. The ID data 1 generator 13 creates the same program number as the program number detected by the ID data 1 detector 35. (3) Set recording of SRID When the tape runs in the reproducing state and reaches the point P3, the ID data 1 is rewritten in accordance with an instruction from the edit indicator 33. The point P3 is determined from the absolute position information detected by the sub data 1 detector 37 based on the reproduced signal.

When the ID data 1 is rewritten, the mode for recording the recording signal generated by the recording device 22 and the rotation heads 2a, 2a are determined at a timing determined by a method described later.
The mode for reproducing the signal from b is switched by the edit point switch 29. That is, when scanning the subcode area of the track on which the ID data 1 has been recorded, the mode is a mode for recording a recording signal, and when scanning the other area, a mode for reproducing signals from the rotary heads 2a and 2b. Becomes

First, the ID data 1 generator 13 receives a new ID data 1 according to an instruction signal from the edit instructor 33.
Create However, as for the program number, the same program number as the program number detected by the ID data 1 detector 35 before the start of rewriting is held. Also, a predetermined block identification code is created for the block identification code. Here, a set signal is created for the SRID. Then, the created ID data 1 is input to the synthesizer 20.

Now, when rewriting ID data 1,
A signal is newly recorded only when the head scans the subcode areas of the tracks with track numbers 0, 1, 2, 7, 8, and 9. The method for determining this timing will be described later. However, when the head scans the subcode areas of the tracks of the track numbers 3 to 6, the data on the track can be read because the head is in the reproducing state. When rewriting the ID data 1 of the ID part of each sync block of the subcode area recorded on the tracks 0, 1, 2 and the sub data 1 recorded in the data part of the same sync block,
(Absolute position information) also needs to be rewritten at the same time. However, the previously recorded data must be held as the sub data 1. Here, the same sub data 1 is
Tracks 3 and 4 are also recorded in addition to tracks 0, 1, and 2. Therefore, the sub data 1 to be 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.

Also, the I recorded on tracks 7, 8, and 9
When rewriting the D data 1, 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 previously recorded data must be held as the sub data 2. Here, the same sub data 2 is recorded on tracks 5 and 6 in addition to tracks 7, 8 and 9. Therefore, the sub data 2 to be recorded on the tracks 7, 8, and 9 are the same as the sub data 2 obtained by reproducing the tracks 5 and 6 in the same frame, and are easy to create.

Here, 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 synthesizer 19.

Here, since the ID data 2 is not rewritten, no detailed description will be given on the creation of the ID data 2 (APID, COID).

The synthesizer 20 includes a segment number detector 34
And the sink and I according to the segment number detected by
The D data 1 or 2 and the sub data 1 or 2 are combined. Here, the segment number detector 34 is
By demodulating the reproduced signals from a and 2b, the segment number (track number in one frame) included in the video signal in the video signal area 25 is detected. For example, in FIG. 6, the segment number of the track 24_10 is 0. The detected segment number is the segment number one scan before, and since two channels are simultaneously recorded, the same head and the track currently being scanned are
The segment number differs from the track before scanning by two. Judging from the segment number one scan before detected by the segment number detector 34, if the segment number of the track currently being scanned is 0, 1, 2, the synthesizing unit 20 sets the sync, ID data 1, Data 1 is synthesized and output. Similarly, if the segment number of the track currently being scanned is 3 or 4, the sync, ID data 2 and sub data 1 are combined and output. If the segment numbers of the track currently being scanned are 5 and 6, the sync, ID data 2 and sub data 2 are combined and output. If the segment number of the track currently being scanned is 7, 8, and 9, the sync, ID data 1 and sub data 2 are combined and output.

The signal output from the synthesizer 20 is stored in the recorder 2
2 is input. The recording device 22 includes rotating heads 2a and 2b.
In response to the clock output of the clock generator 9 serving as the control reference for the sub-code, a recording signal for recording the sub-code in the sub-code area is output to the edit point switch 29. The recording current is created by such an operation.

The subsequent operation will be described with reference to FIGS. FIG. 8 is a configuration diagram of the edit timing generator, and FIG. 9 is a time chart of each signal at the time of insert editing.

The editing indicator 33 outputs a signal for instructing rewriting of the ID data 1. That is, when the segment number is 0, 1, 2, 7, 8, and 9, a signal instructing to rewrite the subcode area is input to the edit timing generator 32. This instruction signal is output up to the point P4.

When the edit point switch 29 is connected to the terminal 29b
, 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 a positioning information signal recorded in a part of the positioning information signal area 27 of the tracking signal area on the track, and detects the position of the positioning signal as shown in FIG. Generate a pulse signal that represents. This pulse signal is input to the edit timing generator 32.

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

To rewrite the subcode 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 includes an output signal of the edit indicator 33 and the positioning information signal detector 31.
, And a timing signal for switching the connection of the edit point changeover switch 29 between the terminals 29a and 29b. Next, the operation of the edit timing generator 32 will be described in detail.

The output signal of the edit indicator 33 and the output signal of the segment number detector 34 are
Is input to the comparison calculator 32a. Then, the comparison arithmetic unit 32a detects the track number to be tracked in the next head scan based on the output of the segment number detector 34. If the track number matches the track number input from the edit indicator 33, the comparison operation unit 32a sets the output Trs to Trs = "H"; otherwise, the comparison arithmetic unit 32a sets Trs = "L". . Here, since the segment number detector 34 detects the segment number included in the video signal recorded in the video signal area 25, the rotary head 2a scans the subcode area 26 or the tracking signal area 28. The segment number held when the scan is performed is the segment number at the time of the previous scan.

The output pulse signal of the positioning information signal detector 31 is input to a first delay circuit 32b and a second delay circuit 32c. Each of the delay circuits starts counting the internal clock of the recording / reproducing apparatus shown in FIG. 9A, and counts the internal clocks corresponding to the specified delay times t1 and t2, thereby generating a delay signal of each delay circuit. Then, those signals are converted to R-S FF (Flip Flo
p) 32d as shown in FIG.
A sub-code edit timing signal as shown in FIG. The subcode edit timing signal is input to the AND circuit 32e together with the output Trs of the comparison arithmetic unit 32a, and the operation result is input to the edit point switch 29 as an ID data 1 edit timing signal.

The ID data 1 created as described above
Only when the edit timing signal is "H", the edit point switch 29 is switched from the terminal 29b to the terminal 29a, and a new recording signal is applied to the rotary head 2a.
The new ID data 1 is rewritten in the subcode area of the track on which the D data 1 is recorded. This operation is performed up to the point P4. Thereafter, the tape running is stopped, and the insert editing is terminated.

The recording current is created by the method described above.
By determining the rewriting timing, in the embodiment of the present invention, it is possible to perform insert editing in which the ID data 1 is rewritten while the ID data 2, the sub data 1, and the sub data 2 are stored. Then, a cueing ID (SRID) as shown in FIG. 7C is recorded as a result on the tape. That is, the information for locating the point P4 could be deleted.

If the information for locating the point P4 is to be erased as described above, the SRID for locating the point P1 is from the point P1 to the point P6.
Will be set in the section up to. That is, the SRID is set to a section length sufficient to perform a high-speed search for the point P1. That is, the high-speed search function of the point P1 can be maintained.

After rewriting, the point P
Although the SRID is set to a section longer than 150 frames (210 frames in this embodiment) in order to search for 1, there is no adverse effect on the detection capability at the time of high-speed search (conversely, the detection capability is low). There is no problem. However, the subsequent rewriting operation needs to be performed on the assumption that the SRID is set in a section longer than the predetermined 150 frames.

In this embodiment, the case where the section L2 is set and rewritten has been described.
SRI in the section of 150 frames or more starting from
It is sufficient that D is set, and the subsequent section may be reset and rewritten. Needless to say, such a case is also included in the present invention.

The case described above means that the SRI to be stored within a predetermined section before the recording position of the SRID to be erased (within the above example, within 15 frames).
This is the case where the D set section exists. Here, a case will be described in which there is no SRID set section to be stored in a predetermined section before the recording position of the SRID to be erased. That is, in the operation (1) described above, a case is described in which it is not possible to detect that the SRID switches from the reset section to the set section while rewinding the section from the point P4 to a position 15 frames before. In this case, the set section of the SRID to be erased may simply be reset and rewritten. A detailed description of this reset rewriting method will be omitted because it deviates from the gist of the present invention.

FIG. 10 shows another example of the contents and arrangement of the ID data 111 and the sub data 121 of the subcode. In this case, the same ID data is recorded in all the tracks in one frame. The recording of the sub-data is the same as that shown in FIG.

Next, the ID data in this embodiment will be described. Explaining the ID data 111 in the order of head scanning, first, 4 bits of the SB number 113 are recorded. This is the same as in the embodiment shown in FIG. Next, the block identification code 114 is recorded in two bits.
In this case, since there is only one ID data block and two sub data blocks, there are two combinations of the ID data block and the sub data block.
That is, the block identification code 114 is the sub data 1
It suffices if it is possible to identify the block (sub data block 1) in which is recorded and the block (sub data block 2) in which the sub data 2 is recorded. Therefore, in this case, b'00 'is recorded as a block identification code on tracks 0 to 4 where the sub data 1 is recorded. Sub data 2
B'10 'is recorded as a block identification code on tracks 5 to 9 on which is recorded. Then, one bit of the SRID 115 and one bit of the PHID 131 are recorded. SRI
D115 is a cueing ID as in the above-described embodiment. The PHID 131 is an ID for searching for a section where a desired image is recorded. Here, SR
The ID is recorded at the start position of the recorded program, and
The PHID is set and recorded in a section where a desired image (moving image or still image) existing in the middle of the program and needing to be searched is recorded. Further, the APID 11 described above
8 is recorded in 4 bits, and PN0 (132) is recorded in 4 bits. Now, it is assumed that the SRID and the PHID are not simultaneously set and recorded. At that time, PN0 (13
As 2), the program number is recorded in the section where the SRID is set and recorded, and the number corresponding to the image data recorded in that section is recorded in the section where the PHID is set and recorded. It is possible. If you do so, VTR with excellent search function
Can be realized. That is, the SRID can be searched while checking the program number, or the PHID can be searched while checking the image data number. Of course, in this case, it goes without saying that the subcode area can be used more efficiently than in the case where the program number and the image data number are separately provided and recorded.

Next, the operation of rewriting the SRID or PHID when ID data is recorded as shown in FIG. 10 will be described. Here, the SR shown in FIG.
The erasing operation will be described by replacing ID with SRID or PHID shown in FIG. In particular, here PHI
The case where D is erased will be described.

In this embodiment, the PHID (or SRI)
Even when D) is rewritten, (1) shown in FIG.
To (3). The entire operation timing is the same as in the case of the above-described embodiment. However, what is different from the above-described case is that when the subcode area is rewritten in the operation (3), the subcode areas of all tracks need to be rewritten. However, as in the case described above, the contents of items other than the PHID need to be saved from the previously recorded contents. Therefore, the new sub data 1, sub data 2, and SRID and API included in the ID data in (3)
The method of creating D and PN0 is different from that described above.

As described in the above embodiment (the case shown in FIG. 4), in the insert editing operation,
The state (2) where the tape is running in the reproduction state changes from a certain timing to the mode (3) in which the subcode area is rewritten. In this embodiment,
The new sub-data 1 is obtained at the moment when the sub-data 1 (absolute position information) detected by the sub-data 1 detector 37 is switched to the rewrite mode during running in the reproduction state (that is, the sub-data 1 It is created by incrementing by the sub-data 1 generator 15 from the moment when it is no longer input. Similarly, sub data 2
(User information) is created by the sub-data 2 detector 38 and the sub-data 2 generator 16.

For the SRID, the same content as the information detected by the ID data 1 detector 35 during running in the reproducing state is recorded. If the SRID is set and recorded, it may be recorded over a section longer than a predetermined recording section, but there is no practical problem.

For the APID, while the vehicle is running in the reproducing state,
The same content as the information detected by the D data 1 detector 35 is recorded. Due to the nature of the APID, even if it is created in this way, the previously recorded information can be completely stored.

[0077] Also for PN0, the ID is generated during running in the reproduction state.
The same content as the information detected by the data 1 detector 35 is recorded.

Further, regarding the block identification code,
A number corresponding to the sub data (sub data 1 or sub data 2) to be recorded on the track is created.

As described above, information other than the PHID in the PHID rewrite section (set recording section) is created.

The operation of rewriting the SRID is the same in principle. With respect to the new PHID, the same content as the information detected by the ID data 1 detector during running in the reproduction state is recorded.

If information other than the PHID or SRID to be rewritten is newly created by the above-described method, the contents previously recorded can be preserved even in the rewriting section. of course,
The PHID or SRID is rewritten as described with reference to FIG. 7 as in the case of the above-described embodiment.

Therefore, the same effect as described in the above-described embodiment when erasing the cue information (PHID or SRID) in the recorded tape is retained in this embodiment.

In this embodiment, it is preferable that the ID data 1 is rewritten in the section L3, and that the same PN0 is recorded in the section from P1 to P6. If it does so, the image number PN0 corresponding to the erased PHID will not be stored.

In the present embodiment, an example of the case of simultaneous recording of two channels has been described. However, the combination and arrangement of the rotary heads are not limited to the present embodiment, but can be applied to other cases.

Further, in this embodiment, an example is described in which the subcode area is provided between the tracking signal area and the video signal area. However, the present invention is not limited to the position on the track where the subcode area is provided. For example, it may be provided in the latter half of the track after the video signal area when viewed in the head scanning direction, and it goes without saying that it is included in the present invention.

Further, in the present embodiment, the case where a video signal of 30 frames per second is created, but the number of frames is not limited to this. Also, a case has been described in which a video signal of one frame is divided into ten segments and recorded on ten tracks, but the number of segments to be divided is not limited.

Further, in this embodiment, the case of a device for recording a video signal is shown, but it goes without saying that the present invention also includes a case in which an audio signal is recorded.

In this embodiment, two types of tracking pilot signals are shown.
Pilot signals of four kinds of frequencies such as those used in R may be used. Further, a method of recording a kind of pilot signal by changing the recording location of the pilot signal like DAT may be used. It is not limited to the way of putting.

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

[0090]

As is apparent from the above description, according to the present invention, the erase operation is performed when the cue information is recorded in a predetermined section before the cue information recording position to be erased. Even if the search is performed, the cue information in front of the cue information is stored so as to be set in a section sufficient for performing the high-speed search, and does not affect the detection capability of the stored cue information during the high-speed search. Therefore, if the recording / reproducing method of the present invention is applied to a VTR or the like, it is possible to realize a device having an excellent function of rewriting and editing cue information.

[Brief description of the drawings]

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

FIG. 2 is a layout diagram of a rotary head on a cylinder in the magnetic recording / reproducing apparatus shown in FIG.

FIG. 3 is a configuration diagram of a subcode area in one embodiment of the present invention.

FIG. 4 is a diagram showing contents and arrangement of an ID part and a data part of a subcode in one embodiment of the present invention.

FIG. 5 is a diagram showing detailed contents and arrangement of sub-data recorded in a data portion of a sub-code in one embodiment of the present invention.

FIG. 6 is a diagram showing an operation during insert editing of a magnetic recording / reproducing apparatus to which the recording / reproducing method of the present invention can be applied.

FIG. 7 is a diagram showing a flow of operations and track positions at the time of insert editing in one embodiment of the present invention.

FIG. 8 is a configuration diagram of an edit timing generator according to the magnetic recording / reproducing apparatus shown in FIG. 6;

FIG. 9 is a time chart of each signal at the time of insert editing in one embodiment of the present invention.

FIG. 10 shows a subcode ID according to an embodiment of the present invention.
Diagram showing another example of the contents and arrangement of the data section and data section

FIG. 11 is an explanatory diagram of a cueing ID rewriting operation performed conventionally.

[Explanation of symbols]

 DESCRIPTION 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 Segmentation circuit 11 Frame synchronization signal generator 12 Tracking signal generator Reference Signs List 13 ID data 1 generator 14 ID data 2 generator 15 Sub data 1 generator 16 Sub data 2 generator 17 Sink generator 20 Synthesizer 21 Sub code generator 22 Recorder 23 Rotary head controller 24_0 to 24_9 Track 25 Video Signal area 26 Subcode area 27 Positioning information signal area 28 Tracking signal area

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/087 101 G11B 27/28

Claims (1)

(57) [Claims] 1. A recording / reproducing method in which a subcode area in which cue information is recorded is provided in a part of an inclined track on a tape, wherein the cue information is a cue target.
Set recording section indicating the section and
Display the status of the reset recording section indicating the current section.
However, the set recording section has a recording section longer than a predetermined length.
A first set recording section to be recorded and a recording section shorter than a predetermined length
Display any state with the second set recording section having
And the first set recording section or the second set
When erasing a recording section , the first section to be erased is deleted.
Set recording section or the second set recording section to be erased.
A is for the erased set recording section predetermined section of the hand <br/> before the recording start position between, detects the presence of the set recording area, if the set recording interval is detected, the detection of
The said set recording area and the erasing target set recording interval
Recording and reproducing method, wherein the rewrite set reset recording section existing between the.