JP3063469B2 - 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 function of changing recording contents including rewriting of a predetermined recording area, erasing of a predetermined recording area, and continuous additional recording after the predetermined recording area.

[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, the miniaturization and digitization of the apparatus by higher density recording are being developed. 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. An example of recording such a subcode is DAT (Digital Audio Ta
pe recorder), 8 mm VTR 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 the recorded video signal or audio signal is kept.

[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 setting and recording for 9 seconds in addition to 4 seconds. With this, the newly recorded cue ID
However, there is a problem that an accurate set recording start position 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.

[0004]

However, the above-described method of recording the cue ID has the following disadvantages.

That is, the cueing ID is not always recorded continuously in a predetermined section (9 seconds in the above-described conventional example). After rewriting as described above, if the section for reset recording is 1 sec, 3 sec
There may be a tape on which c-set recording is performed, 1-sec reset recording is performed, and thereafter, 9-sec set recording is performed. Such a case in which only the cueing ID recorded in the first 3 sec set of the tape on which the SRID is recorded is not considered until now.
As a result, if reset recording is performed for 9 seconds in order to delete the cue ID recorded at a certain location, the cue IDs of a plurality of sections may be deleted in some cases. That is,
There has been a problem that reset rewriting is performed up to a section that should be left as a set recording section.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording / reproducing method in which cue information is set and recorded over a predetermined section in a tape traveling direction, and is not necessarily set and recorded continuously over a predetermined section such as a rewritten tape. Further, even when a plurality of pieces of cueing information are recorded in the predetermined section, a recording / reproducing method devised so that only desired cueing information can be erased is provided.

[0007]

According to the present invention, there is provided a recording / reproducing method according to the present invention, wherein a sub-code area for recording cue information is provided in a part of an inclined track on a tape; information for out a recording and reproducing method of setting recorded over the tape traveling direction of the predetermined section, leaving the head
The set information indicates the section to be searched for.
Reset indicating sections and sections not to be searched
Indicates any state with the recording section, and when the cue information is reset and rewritten, the cue information is
Detecting a set recording interval start point and set the recording section end points, the detected set record interval start point
Is characterized in that reset <br/> preparative rewritten to set recording section end point detected from.

[0008]

According to the present invention, even when a plurality of pieces of cueing information are recorded by rewriting and editing within a predetermined section in which cueing information is set and recorded, only desired cueing information is erased. It is possible to do.

[0009]

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.

In the sync generator 17, a sync signal is generated. 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 this 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 (4 or more) continuous segment numbers.

In accordance with the clock output of the clock generator 9, the recorder 22 outputs to the rotary heads 2a and 2b a recording signal for recording the segmented video signal, the subcode and the tracking signal separately in the respective 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.
Each SB includes a sync unit 100, an ID unit 110, and a data unit 120. As described above, the sync unit 100 records a 2-byte signal indicating the SB recording start position. The ID section 110 has ID data 111 of 2 bytes (ID0 and ID1 is 1 byte each), IDP 112
Is recorded in one byte. 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. 1
By recording the IDP 112 at this position in the SB, if the data from the sink unit 100 to the ID unit 110 can be read, the ID data 111 recorded as ID0 and ID1 can be read. At this time, it is not necessary to read the entire 1SB (from the sink unit 100 to the data unit 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.

Now, the data part 120 contains 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 subcode ID data 111 and the subdata 121. 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.

Track data 0, 1, 2, 7, 8, and 9 record ID data 1 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 on 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 of the track numbers 0, 1, 2 is b'00 ', and the block identification code 114 of the track numbers 7, 8, 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 sub-code is added to a video signal and recorded simultaneously, it can be effectively used at the time of editing or searching.

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. Those recorded in the ID section 110 have a higher detection probability at the time of high-speed search than those recorded in the data section 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 adopted, 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 for erasing (resetting and resetting) 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, a description will be given assuming that the cueing ID (SRID) is set and recorded on the tape for 5 seconds (150 frames). Here, after the SRID editing operation is performed, as shown in FIG.
It is assumed that D is recorded. In FIG. 7A, the set recording section from point P2 to point P4 is 1
00 frames, the reset recording section from point P4 to point P5 is 10 frames, and the set recording section from point P5 to point P6 is 150 frames. A case where the SRID set and recorded between the point P2 and the point P4 of the recorded tape is reset and rewritten will be described.

First, the outline of the operation will be described. (1) It is assumed that an editing operation for erasing (resetting and resetting) the SRID starts from point P3. First, the tape is run in the reproducing state, and the SRID is detected. And S
When the reset recording section of the RID is detected, the operation of (2) is performed. Since the set recording section of the SRID has a maximum length of 150 frames, the above-described SRID detection operation has a maximum length of 1 frame.
This is performed over 50 frames. (2) The tape is rewound. At this time, the rewind end point P1 is the SRID to be erased.
It is about 10 frames before the start position P2 of the set recording section. Here, the tracking pull-in must be completed while traveling from point P1 to point P2. (3) Reproduce the tape and detect data in the subcode area required when rewriting the SRID. (4) SR in the section from point P2 to point P4
The ID is reset and recorded.

As described above, at the time of reset rewriting of the SRID, first, the reset recording section is detected over a predetermined section (up to 150 frames), and then the reset recording is performed up to the point before the reset recording section (point P4).

Next, the operations (1) to (4) will be described in detail. (1) Position Detection of SRID Set Recording End Point First, the operation of the entire apparatus will be described. Now, it is assumed that the edit indicator 33 recognizes that the SRID is set and recorded at the point P2 in FIG. 7 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 cylinder 3 on which the rotary heads 2a and 2b are mounted so as to synchronize with the clock output of the clock generator 9.
To control the rotation speed of the. Since the edit point changeover switch 29 is connected to the terminal 29b, a reproduction signal is output from the rotary head 2a. Further, tracking control is performed by this output signal. The capstan control circuit 6 is instructed by the editing indicator 33 to perform tracking control.

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. Then, the tape is run in the reproducing state from point P3, and it is detected whether the reset signal or the set signal is recorded as the SRID. By this operation, the set recording end point P4 of the SRID is detected. As described above, in the recording / reproducing apparatus of the present invention, the sub data 1
As absolute position information. During the reproduction, the absolute position information is detected by the sub data 1 detector 37, and the point P4
Is stored in the memory in the edit indicator 33.

When the set recording end point P4 of the SRID is reached, the operation (2) is performed. (2) Tape rewind operation The edit indicator 33 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. Of course, no tracking is performed in this case. Here, rewinding is performed at three times the speed of recording (-3
Double speed). Then, the information of the subcode area recorded on the tape is reproduced while rewinding, and the recording start position P2 of the SRID set recording section to be reset / rewritten by the ID data 1 detector 35 and the sub data 1 detector 37 is determined. The absolute position information is detected. After that, the absolute position information is continuously detected by the sub-data 1 detector 37, and after the extra position is rewound by a predetermined section from the absolute position corresponding to the point P2, the operation is stopped. Here, it is assumed that the frame is rewound extra by an interval equivalent to 10 frames from the point P2.
It is one. (3) Reproduction of tape Tracking is performed in the same manner as in the operation of (1),
Run the tape in playback mode. The reproduction signal from the rotary head 2a is input to the ID data 1 detector 35. ID
The data 1 generator 13 creates the same program number as the program number detected by the ID data 1 detector 35. (4) SRID reset recording When the tape runs in the reproducing state and reaches the point P2, the ID data 1 is rewritten in accordance with an instruction from the edit indicator 33. The point P2 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 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. Needless to say, a reset signal is generated here for the SRID. And
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.

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.

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 synthesizer 19.

Here, since the ID data 2 is not rewritten, no detailed description is made 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 edit 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 the segment number (the 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 supplied to a first delay circuit 32b and a second delay circuit 32c.
Is input to 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. If the SRID is reset and rewritten in this manner, only the desired SRID set recording section can be reset and rewritten, that is, other SRIDs can be rewritten.
Set recording section (point P in the example shown in FIG. 7)
It is no longer possible to rewrite (section from 5 to point P6). Since the set recording start position of the SRID has an important meaning at the time of searching or editing, the above method is very effective.

In the example shown above, the SR is determined based on the absolute position information detected by the sub-data 1 detector 37.
Although the example in which the ID reset rewrite start point P2 is detected has been described, the SR detected by the ID data 1 detector 35
The point P2 may be detected by detecting a switching point from the reset recording of the ID to the set recording.

The erasing method described above is also effective when the set recording section of the SRID to be erased is longer than a predetermined set recording section. That is, since the reset rewriting can be reliably performed up to the set recording end point of the erasure target, no erasure remains.

Next, another example of the erasing (reset rewriting) operation of the cue ID will be described with reference to FIG. Also in this example, it is assumed that the cueing ID (SRID) is set and recorded on the tape for 5 seconds (150 frames). Now, here, as shown in FIG.
The case where the RID is recorded and the SRID set and recorded between the point P2 and the point P4 is reset and rewritten will be described. In this case, point P3
, The operation to be stored is performed in the section L1 (corresponding to 150 frames) starting from the point P3.
There is an ID set recording start point. Such a case will be described. (11) Detection of presence / absence of SRID set recording start point Erasing of SRID from point P3 (reset rewriting)
Suppose an editing operation is started. First, the tape is run in the reproducing state, and the SRID is detected. And SRID
If the set recording start point is detected, the operation of (12) is performed. However, even after running 150 frames, SRI
The case where the set recording start point of D cannot be detected will be described later. Here, a case will be described in which the set recording start point of the SRID can be detected before traveling 150 frames. (12) Tape rewinding operation At this time, the rewinding end point P1 is set to be about 10 frames before the start position P2 of the SRID set recording section to be erased. Here, the tracking pull-in must be completed while traveling from point P1 to point P2. (13) Reproduce the tape and detect data in the subcode area required when rewriting the SRID. (14) S in the section from point P2 to point P5
Reset recording of RID.

As described above, at the time of reset rewriting of the SRID, first, a reset recording section is detected over a predetermined section (up to 150 frames), and thereafter, reset recording is performed up to a point before the set recording start point (point P5). The detailed operation is the same as that described with reference to FIG. By performing the above-described operation, only the desired SRID set recording section can be erased (reset rewrite), as in the case of the above-described embodiment.

In the present embodiment, the case where the set recording start point of the SRID has been detected by the time of traveling 150 frames in the operation (11) has been described.
Here, the operation in the case where the SRID set recording start point cannot be detected while traveling for 150 frames will be described. In this case, the operations of (12) and (13) are the same as those described above, and only the operation of (14) is different. The difference is in the section in which the SRID is reset and recorded.
The ID is reset and recorded.

FIG. 11 shows another example of the contents and arrangement of the subcode ID data 111 and subdata 121. 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. 11 will be described. Here, a case where the PHID is rewritten will be described. When the PHID (or SRID) is rewritten in this embodiment, the subcode areas of all tracks in that section are rewritten. However, as for the content of items other than the PHID, the previously recorded content needs to be saved. Here, the overall operation timing and the like are the same as in the case of the above-described embodiment. That is, when newly recording a PHID on a recorded tape, the above-mentioned (1) to (4)
Alternatively, the operations of (11) to (14) are performed. However, the new sub-data 1, sub-data 2, and SRI included in the ID data in (4) or (14)
The method of creating D, APID, 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 ((3) or (13)) of running the tape in the reproducing state changes from a certain timing to the mode ((4) or (14)) in which the subcode area is rewritten. In the present 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 detector It is created by incrementing by the sub-data 1 generator 15 from the moment the sub-data is no longer input from 37). Similarly, sub data 2 (user information)
It 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.

[0086] The APID is also used during running in the reproduction state.
The same contents as the information detected by the D data 1 detector are recorded. Due to the nature of the APID, even if it is created in this way, the previously recorded information can be completely stored.

Regarding PN0, since the PHID is reset and recorded, it does not matter what number is recorded. Here, the number corresponding to such a case is ID
It is assumed that it is created in the data 1 generator 13.

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 (reset 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 previously recorded contents can be preserved even in the rewriting section. of course,
The PHID or SRID is rewritten as described with reference to FIG. 7 or FIG. 10 as in the case of the above-described embodiment.

Accordingly, a new PHID is added to the recorded tape.
Alternatively, when the SRID set recording section is reset rewritten, only the desired set recording section can be reset rewritten, and the other set recording sections can be saved as in the case of the above-described embodiment.

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 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 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 includes a case of recording an audio signal.

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. Regarding the tracking control, control using a control signal recorded on a linear track at the end of the tape as in a conventional VHS VTR may be performed.

[0090]

As is apparent from the above description, according to the present invention, when a plurality of pieces of cueing information are recorded by rewriting and editing within a predetermined section in which cueing information is set and recorded. Also, only the desired cueing information can be erased. Thus, 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 block 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 is a diagram showing a flow of operations and track positions at the time of insert editing according to an embodiment of the present invention.

FIG. 11 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

[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 provided subcode area for cue information in a part is recorded in the inclined track on the tape, there the cue information recording and reproducing method of setting recorded over the tape traveling direction of the predetermined section And the cueing information is the head
Set recording section indicating the section to be searched, and cueing
The reset recording section that indicates the section that is not the target of
When the cue information is reset and rewritten , the cue information is set in a set recording section of the cue information.
Reproducing method characterized by detecting a starting point and a set recording section end point, resets rewritten to <br/> set recording interval end point detected from the detected set recording interval start point.