JPH0744934A - Recording / reproducing method - Google Patents

Abstract

(57) [Summary] [Purpose] Only the desired cueing information is erased even when multiple cueing information is recorded by rewriting and editing within the predetermined section in which the cueing information is set and recorded. Provided is a recording / reproducing method capable of performing the above. [Structure] A subcode area in which information for cueing is recorded is provided in a part of an inclined track on a tape. Cue ID
(SRID) is set and recorded over a predetermined section in the tape traveling direction. When resetting and rewriting the cueing information, first, the set recording end point of the cueing information is detected, and then the set recording end point is reset and rewritten.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A recording / 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 is in widespread use. In addition, further miniaturization of devices by higher density recording and development of digitization are being carried out. Usually, when an information signal is recorded, it is recorded including a subcode. Here, the sub-code is a code attached to the information signal, such as a cue ID indicating the recording start position of the data, an absolute time code indicating the absolute position on the tape, a user time code determined by the 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 T or 8 mm VTR standard, it is possible to perform editing such that only the subcode is rerecorded while the recorded video signal or audio signal is retained.

Among subcodes, the cue ID editing function is frequently used. Here, a method of recording the cue 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 as a matter of course, the longer the recording is, the higher the detection capability becomes. Especially, when the cue ID is recorded on a part of the inclined track, the tendency is remarkable. Then, it is assumed that the information indicating the necessity of new cueing is recorded in the middle of the cueing ID set recording section (for example, the position 4 seconds after the cueing ID set recording is started), and that portion is recorded. Consider an editing operation in which a new cue ID is set and recorded for 9 seconds. In this case, in the conventional method, the cue 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 ID
However, there was a problem that the accurate set recording start position of could not be determined. Therefore, at the time of rewriting the set of the cue ID, the set recording is performed after reset recording for a predetermined period. If you do so, cue ID after rewriting
It is also possible to determine the set recording start position of.

[0004]

However, the above-described method for recording the cue ID has the following inconveniences.

That is, the cue ID is not always recorded continuously in a predetermined section (9 sec in the above-mentioned conventional example). After the rewriting as described above, if the interval for reset recording is 1 sec, 3 sec
There may be a tape in which after c set recording, 1 sec reset recording, and then 9 sec set recording. The case of erasing only the cue ID recorded in the first 3 sec set of the tape in which the SRID is recorded is not taken into consideration until now.
As a result, if 9-sec reset recording is performed in an attempt to erase the cue ID recorded at a certain location, the cue IDs of a plurality of sections may be erased in some cases. That is,
There was a problem that the section that should be left as the set recording section is reset and rewritten.

An object of the present invention is a recording / reproducing method in which cueing information is set and recorded over a predetermined section in the tape traveling direction, and it is not always set and recorded continuously over a predetermined section such as a rewritten tape. Moreover, the present invention provides a recording / reproducing method devised so that even when a plurality of cueing information is recorded in the predetermined section, only the desired cueing information can be erased.

[0007]

In order to solve the above-mentioned problems, the recording / reproducing method of the present invention provides a subcode area in which information for cueing is recorded in a part of a slanted track on a tape. Information is a recording / reproducing method in which set information is set and recorded over a predetermined section in the tape traveling direction.When resetting and rewriting the cue information, first, the set recording end point of the cue information is detected and set recording is performed. It is characterized by resetting and rewriting up to the end point.

[0008]

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

[0009]

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 a cylinder (not shown), and 24_0-2
Reference numerals 4_9 are tracks formed on the magnetic tape 1. Reference numeral 7 denotes a tape running device, which is composed of a capstan motor 4, a pinch roller 5, and a capstan control circuit 6. Reference numeral 8 is a video signal generator, 9 is a clock generator, 10 is a segmenting circuit, 11 is a frame synchronization signal generator, and 12 is a tracking signal generator. Two
1 is a subcode generator, and ID data 1 generator 1
3, ID data 2 generator 14, sub data 1 generator 1
5, a sub data 2 generator 16, a sync generator 17, and a combiner 20. Further, 22 is a recorder and 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 view showing the arrangement of the rotary heads on the cylinder in this embodiment, and 3 is the 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. For this positioning signal, a relatively high frequency that is less likely to be affected by the adjacent track is selected. Further, a tracking pilot signal is frequency-multiplexed and recorded in the tracking signal area 28. This pilot signal is alternated every other track at two different frequencies f1, f2, f1, f2, f1,
It is recorded as f2, .... The frequencies of these two types of pilot signals are selected to be relatively low frequencies that are less likely to be affected by the azimuth loss of the rotary heads 2a and 2b. A video signal is recorded in the video signal area 25, and a subcode is recorded in the subcode area 26.

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

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

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

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

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

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.

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

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

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

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

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

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

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

Therefore, in the present embodiment, the ID data 1, the ID data 2, the sub data 1, and the sub data 2 are included in the sub code in a plurality of consecutive segment numbers (4 or more).

In response to the clock output of the clock generator 9, the recorder 22 outputs a recording signal to the rotary heads 2a and 2b so that the segmented video signal, the sub-code and the tracking signal are divided into areas.

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

As a result of the above operation, the track as shown in FIG. 1 is formed on the magnetic tape 1. Here, the detailed structure of the subcode area 26 in one track is shown in FIG.
FIG. 3A shows the detailed structure of 1SB of the subcode.
It shows in (b). First, as shown in FIG. 3A, the sub-code area in one track consists of 12 SBs (SB0 to SB11). As shown in FIG. 3B, 1
Each SB includes a sync unit 100, an ID unit 110, and a data unit 120. As described above, 2 bytes of the signal indicating the SB recording start position is recorded in the sync unit 100. In the ID section 110, the ID data 111 is 2 bytes (ID0 and ID1 are 1 byte each), and the IDP 112 is
Is recorded for 1 byte. That is, 3 bytes are recorded in the ID part 110. Details of the ID data 111 will be described later with reference to FIG. A parity signal is recorded in the IDP 112. The IDP 112 is a signal for detecting (and further correcting) a reading error of the signal from the sync unit 100 to the ID unit 110 in SB. 1
By recording the IDP 112 at this position in the SB, if the sync 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 sync section 100 to the data section 120). This is advantageous for data reproduction when the scanning locus of the rotary head crosses the track on the tape diagonally during high-speed search.

Now, in the data section 120, the sub data 1
21 is 5 bytes, DP (DATA_PARITY) 12
2 is recorded in 2 bytes. Details of the sub data 121 will be described later with reference to FIG. A parity signal is recorded in the DP 122. The DP 122 is a signal for detecting (and further correcting) a reading error of the signal from the sync unit 100 to the data unit 120 in the SB. When the signal from the sync 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 the ID data 1 and the ID data 2, and the contents of the sub data 121 are recorded by switching between the sub data 1 and the sub data 2.

ID data 1 is recorded on the track numbers 0, 1, 2, 7, 8, 9 as ID data. Although it is divided within one frame, if the adjacent frames are taken into consideration, I is recorded in the ID portion of the subcode area in 6 consecutive tracks.
D data 1 is recorded. Here, the ID portion of an adjacent track on which the same ID data is recorded is called an ID block. Similarly, a data portion of an adjacent track in which the same sub data is recorded is called a sub data block.

The ID section 110 in which the ID data 1 is recorded (ID block 1) will be described in the order of head scanning. First, the SB number 113 is recorded in 4 bits. This is SB0 to SB0 in the subcode area 26 in one track.
This is for identifying any of SB11. Next, 2 bits of the block identification code 114 are recorded.
As is clear from FIG. 4, the ID within one frame
There are four blocks that can be formed by combining the data 1 and 2 and the sub-data 1 and 2. It is for identifying the block. Then, one bit of the SRID 115 is recorded. Furthermore, program numbers PN2 to PN0 (11
6) is recorded with a total of 9 bits. SRID115 and program numbers PN2 to PN0 within one frame
The same items are recorded in (116).

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

ID part 11 of track numbers 3, 4, 5 and 6
In ID 0, ID data 2 is recorded as ID data 111 (ID block 2). Explaining in order of head scanning, first, the SB number 113 having the same meaning as in the case of ID data 1 is recorded in 4 bits. Next, similarly, the block identification code 11 having the same meaning as in the case of the ID data 1
4 is recorded in 2 bits. And the next 2 bits 117
Records b'00 '. And APID118
Is recorded for 2 bits and COID 119 is recorded for 6 bits. The APID 118 is ID information that instructs the description content of the ID section 110 and the data section 120. By recording this signal, for example, the contents recorded in the ID part or the data part can be changed between the case of the user tape and the case of the soft tape. Further, as the COID, the ID related to the skip operation, the TOC ID, etc. are recorded. Here, TOC is a program menu of the video signal recorded on the tape, and TOC ID indicates whether or not the section in which the TOC is recorded. The TOC is usually recorded together with the video signal. Now, the same APID 118 and COID 119 are recorded in one frame. Further, the block identification signals 114 of track numbers 3 and 4 are b'01 ', and the track numbers 5 and 5 are
The block identification code 114 of No. 6 is b'10 '. Moreover, 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). User information (sub data 2) is recorded as sub data in the data section 120 of track numbers 5 to 9 (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 recorded in each SB of the sub-code area 26 is recorded.
Only 1 is shown. An absolute time code (ATC123) and a tape counter value (TC124) are alternately recorded for each SB on track numbers 0 to 4 as absolute position information. The recording date (T1 (1
25)) and recording time minute second (T2 (126))
Record every B alternately. However, ATC123, TC
124, T1 (125) and T2 (126) are recorded together with the ITEM identification header as required so that the content can be identified by the identification header during reproduction.

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

Further, as shown in the present embodiment, the subcode area 26 in one track is divided into a plurality of (12 in this embodiment) sync blocks (SB), and the subcode areas of all tracks are divided. ID data 11 of the ID section 110
The block identification code 114 is included in 1 and is recorded. By recording the block identification signal 114 in all sync blocks, the contents of the data in the sync blocks can be read at the time of search in which the sync blocks of the subcode are reproduced and detected across the tracks. Therefore, a high speed search for subcodes is possible.

Further, APID is set in the ID data block 2.
Although 118 is recorded, by recording this ID, it is possible to read during the search and decipher 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
Both D118 are recorded in the ID part 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 110 section may have a shorter reproduction section for reading than the data recorded in the data section 120. Therefore, the detection probability is increased during high-speed search in which reproduction is performed across the tracks.

Further, with the track configuration as described above, the ID data 1, the ID data 2, the sub data 1 and the sub data 2 can be individually edited. Here, “editable individually” means that, for example, when performing editing such as rewriting the ID data 1, the ID data 2, the sub data 1, and the sub data 2 can be stored as they are. Of course, other items (ID data 2
The same applies when rewriting the sub data 1 or the sub data 2). If the VTR has such a function, it will be very convenient. A cue ID and a program number are recorded as the ID data 1. However, if this cue ID can be inserted at an arbitrary position after recording, it is very effective in searching for a desired scene. . On the contrary, the cue ID recorded in an unnecessary place 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 saved. That is, it is a very effective function that the subcode can be edited individually.

Next, the editing operation for deleting (rewriting the reset) 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, it is assumed that the cue ID (SRID) is set and recorded on the tape for 5 seconds (150 frames). Then, 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 points P4 to P5 is 10 frames, and the set recording section from points P5 to P6 is 150 frames. A case will be described in which the SRID set and recorded between the points P2 and P4 of the tape thus recorded is reset and rewritten.

First, the outline of the operation will be described. (1) Assume that an edit operation for erasing (rewriting) resetting of SRID is started from point P3. First, the tape is run in the reproduction state and the SRID is detected. And S
When the reset recording section of the RID is detected, the operation (2) is performed. Since the set record section of the SRID is a maximum of 150 frames, the above SRID detection operation is a maximum of 1
It is performed over 50 frames. (2) Rewind the tape. 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 the point P1 to the point P2. (3) The tape is reproduced and the data in the subcode area required when rewriting the SRID is detected. (4) SR in the section from point P2 to point P4
Reset and record the ID.

As described above, when the SRID is reset and rewritten, the reset recording section is first 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) described above 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 in which the rotary heads 2a and 2b are mounted so as to synchronize with the clock output of the clock generator 9.
Control the rotation speed of. 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 edit indicator 33 to perform tracking control.

Here, the tracking method will be described. In the tracking signal area 28 of the track recorded by the above-mentioned method, pilot signals of two different frequencies f1 and f2 are frequency-multiplexed and recorded every other track. Here, it is assumed that f0 track, f1 track, f0 track, f2 track, f0 track, f1 track, ... Are recorded in order from the track 24_0. Here, no pilot signal is recorded on the f0 track. Frequency f1 for f1 track
Of the pilot signals are frequency-multiplexed and recorded.
The pilot signal of frequency f2 is frequency-multiplexed and recorded on the f2 track. The tracking is controlled so that the rotary head 2a always scans the f0 track. For example, in FIG. 6, tracking is performed so as to scan the track 24_10. Now, the rotary head 2a moves to the tracking signal area 2 of the track 24_10.
8 scans both adjacent tracks 24_9, 2
Different pilot signal components f recorded in 4_11
The leak components 1 and f2 are included and detected. Tracking error information is detected by the tracking error detector 30 from this signal, and the capstan control circuit 6 controls the capstan motor based on the input tracking error information. Here, the tracking error detector 30
A known detector that compares the magnitude of the f1 component and the magnitude of the f2 component and outputs tracking error information proportional to the difference is used as the detector. Here, the tracking error information always outputs the difference between the pilot component included in the preceding track and the pilot component included in the rear track. For example, when the rotary head 2a is scanning the track 24_10, the track 24
A value proportional to the difference between the pilot components included in the tracking signal region of the track 24_9 is output from the pilot component included in the tracking signal region of _11. Since the rotary head 2b is arranged very close to the rotary head 2a and the relative positional relationship between the rotary head 2a and the rotary head 2a can be accurately ensured, the rotary head 2a and the track 24_11 are tracked so that the rotary head 2b and the track 24_11 are tracked. Tracking can also be achieved at the same time.

Tracking is performed as described above,
The reproduction signal from the rotary head 2a is the ID data 1 detector 3
Input to 5. Then, the tape is run in the reproducing state from the point P3 to detect whether the reset signal or the set signal is recorded as the SRID. By this operation, the SRID set recording end point P4 is detected. As described above, in the recording / reproducing apparatus of the present invention, the sub data 1 is stored in the sub code area.
The absolute position information is recorded as. During playback, the sub data 1 detector 37 detects absolute position information, and the point P4
The absolute position information in is stored in the memory in the edit indicator 33.

When the SRID set recording end point P4 is reached, the operation (2) is performed. (2) Rewinding operation of tape The edit indicator 33 instructs the capstan control circuit 6 to perform a rewinding operation of the tape. Generally, rewinding may be performed at a speed higher than the tape speed at the time of recording or reproduction. As a matter of course, tracking is not performed in this case. Here, rewind at a speed three times faster than that at the time of recording (-3
Double speed). Then, while rewinding, the information of the subcode area recorded on the tape is reproduced, and by the ID data 1 detector 35 and the subdata 1 detector 37, the recording start position P2 of the SRID set recording section to be reset and rewritten is set. The absolute position information is detected. After that, the sub data 1 detector 37 continues to detect the absolute position information, and after it is rewound extra for a predetermined section from the absolute position corresponding to the point P2, it may be stopped. Here, it is assumed that the section is rewound by an amount corresponding to 10 frames more than the point P2, and that point is the point P in FIG.
It is 1. (3) Playing the tape Tracking is performed in the same manner as in the operation of (1),
Run the tape in the playing state. 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 is run in the reproducing state and the point P2 is reached, the ID data 1 is rewritten according to the instruction from the edit instructing device 33. The point P2 is determined from the absolute position information detected by the sub data 1 detector 37 based on the reproduction signal.

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

First, the ID data 1 generator 13 receives a new ID data 1 in response to an instruction signal from the edit instruction device 33.
To create. However, regarding the program number, the same program number as the program number detected by the ID data 1 detector 35 is held before the rewriting is started. As for the block identification code, a predetermined block identification code is created. Needless to say, here, the reset signal is generated for the SRID. And
The created ID data 1 is input to the synthesizer 20.

Now, when rewriting the ID data 1,
A signal is newly recorded only when the head scans the subcode areas of the tracks having track numbers 0, 1, 2, 7, 8, and 9. The method for determining this timing will be described later. However, when the head scans the subcode areas of the tracks of track numbers 3 to 6, it is in the reproducing state, so that the data on the tracks can be read. When rewriting the ID data 1 of the ID part of each sync block of the subcode areas recorded on the tracks 0, 1, 2, the subdata 1 recorded in the data part of the same sync block
It is also necessary to rewrite (absolute position information) at the same time. However, the sub-data 1 must retain the previously recorded data. Here, the same sub data 1 is
In addition to tracks 0, 1, 2, it is recorded on tracks 3, 4. Therefore, the sub-data 1 recorded on the tracks 0, 1 and 2 can be created by converting the sub-data 1 obtained by reproducing the tracks 3 and 4 one frame before by one frame.

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

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

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

The synthesizer 20 includes a segment number detector 34.
Depending on the segment number detected by
D data 1 or 2 and sub data 1 or 2 are combined. Here, the segment number detector 34 is the rotary head 2
The segment number (track number in one frame) included in the video signal in the video signal area 25 is detected by demodulating the reproduced signals from a and 2b. For example, in FIG. 6, the segment number of the track 24_10 is 0. Also, the segment number detected is the segment number one scan before, and since 2ch simultaneous recording is being performed, the same head as the track currently being scanned is 1
The segment number differs by 2 from the track before scanning. Then, judging from the segment number one scan before detected by the segment number detector 34, if the segment numbers of the track currently being scanned are 0, 1, 2, the synthesizer 20 determines the sync, the ID data 1 and the sub data. Data 1 is synthesized and output. Similarly, if the segment numbers of the track currently being scanned are 3 and 4, the sync, the ID data 2 and the sub data 1 are combined and output. If the segment numbers of the track currently being scanned are 5 and 6, the sync, the ID data 2 and the sub data 2 are combined and output. If the segment number of the track currently being scanned is 7, 8 or 9, the sync, ID data 1 and sub data 2 are combined and output.

The signal output from the synthesizer 20 is recorded by the recorder 2.
Entered in 2. The recorder 22 includes rotary heads 2a and 2b.
In response to the clock output of the clock generator 9 which is the control reference of (1), a recording signal for recording the subcode in the subcode area is output to the edit point changeover switch 29. A recording current is created by such an operation.

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

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

The edit point changeover switch 29 is the terminal 29b.
While being connected to, the signal from the rotary head 2a is separately input to the positioning information signal detector 31. Then, the positioning information signal detector 31 detects the positioning information signal recorded in the positioning information signal area 27, which is a part of the tracking signal area on the track, and determines the position of the positioning signal as shown in FIG. 9B. Generate a pulse signal to represent. This pulse signal is input to the edit timing generator 32.

The segment number detector 34 detects the segment number (track number within one frame) included in the video signal in the video signal area 25 by demodulating the 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, it is necessary to specify the track (segment) number to be rewritten and the start position and end position on the track. The edit timing generator 32 outputs the output signal of the edit indicator 33 and the positioning information signal detector 31.
, And the output segment number of the segment number detector 34, a timing signal for switching the connection of the editing point changeover switch 29 between the terminals 29a and 29b is created. 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 the same as those of the edit timing generator 32.
Is input to the comparison calculator 32a. Then, the comparison calculator 32a detects the track number to be tracked in the next head scan from the output of the segment number detector 34. If the track number matches the track number input from the edit indicator 33, the comparison calculator 32a sets the output Trs to Trs = "H", and if not, Trs = "L". . 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 during the scanning is the segment number at the previous scanning.

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

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

A recording current is created by the method described above,
By determining the timing of rewriting, in the embodiment of the present invention, insert editing in which the ID data 1, the sub data 1, and the sub data 2 are saved and the ID data 1 is rewritten can be performed. Then, a cue ID (SRID) as shown in FIG. 7C is recorded as a result on the tape. If the SRID is reset and rewritten in this way, only the desired SRID set recording section can be reset and rewritten, that is, another SRID
Set recording section (point P in the example shown in FIG. 7)
It does not happen that the section from 5 to point P6) is rewritten. The SRID set recording start position has an important meaning at the time of searching and editing, and therefore the above-described method is very effective.

In the example shown above, the SR is determined by the absolute position information detected by the sub data 1 detector 37.
Although the example of detecting the reset / rewrite start point P2 of the ID is shown, the SR detected by the ID data 1 detector 35 is detected.
The point P2 may be detected by detecting the switching point from the ID reset recording to the set recording.

The erasing method as described above is also effective when the set recording section of the SRID to be erased is longer than the predetermined set recording section. In other words, since the set recording end point to be erased can be surely reset and rewritten, there is no erasure left.

Next, another example of the erasing (rewriting) operation of the cue ID will be described with reference to FIG. Also in this example, it is assumed that the cue ID (SRID) is set and recorded on the tape for 5 seconds (150 frames). Now, as shown in FIG. 10A, S
Assuming that the RID has been recorded, a case will be described in which the SRID set and recorded between the points P2 and P4 is reset and rewritten. In this case, point P3
The operation is started from, but the SR to be saved 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 or absence of SRID set recording start point Erase SRID from point P3 (reset rewrite)
Suppose you start an edit operation. First, the tape is run in the reproduction state and the SRID is detected. And SRID
If the set recording start point is detected, the operation (12) is performed. However, even if you run 150 frames
The case where the set recording start point of D cannot be detected will be described later. Here, a case where the SRID set recording start point can be detected before traveling for 150 frames will be described. (12) Rewinding operation of tape At this time, the rewinding end point P1 is 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 the point P1 to the point P2. (13) Play back the tape and detect the data in the subcode area required when rewriting the SRID. (14) S in the section from point P2 to point P5
Reset and record the RID.

As described above, when the SRID is reset and rewritten, the reset recording section is first detected over a predetermined section (up to 150 frames), and then the reset recording is performed up to the set recording start point (point P5). The detailed operation is the same as that described with reference to FIG. 7, and thus the description thereof is omitted. Then, by performing the above operation, only the desired SRID set recording section can be erased (reset rewriting), as in the case of the above-described embodiment.

In this embodiment, in the operation of (11), the SRID set recording start point can be detected before traveling 150 frames.
Here, an operation when the SRID set recording start point cannot be detected during 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 different point is the section in which the SRID is reset and recorded, and the SR is set in the section from point P2 to point P4 or in the section corresponding to 150 frames from point P2.
Reset and record the ID.

FIG. 11 shows another example of the contents and arrangement of the subcode ID data 111 and the subdata 121. In this case, the ID data having the same content is recorded on all the tracks in one frame. Since the recording of sub data is the same as that shown in FIG. 4, the description is omitted.

Next, the ID data in this embodiment will be described. The ID data 111 will be described in the order of head scanning. First, the SB number 113 is recorded in 4 bits. This is the same as the case of the embodiment shown in FIG. Next, the block identification code 114 is recorded in 2 bits.
In this case, since there is only one ID data block and two sub data blocks, there are two combinations of ID data blocks and sub data blocks.
That is, the block identification code 114 is the sub data 1
It suffices if the block in which is recorded (sub data block 1) and the block in which sub data 2 is recorded (sub data block 2) can be identified. Therefore, here, b'00 'is recorded as the block identification code on the tracks 0 to 4 on which 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, the SRID 115 is recorded in 1 bit and the PHID 131 is recorded in 1 bit. SRI
D115 is a cue ID as in the case of the above-described embodiment. The PHID 131 is an ID for searching a section in which 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 the section in the middle of the program in which a desired image (moving image or still image) that needs to be searched is recorded. Furthermore, the APID 11 mentioned above
8 is recorded in 4 bits, and PN0 (132) is recorded in 4 bits. Now, it is assumed that SRID and PHID are not set and recorded at the same time. At that time, PN0 (13
As 2), the program number may be recorded in the section where the SRID is set and recorded, and the number corresponding to the image data recorded in the section may be recorded in the section where the PHID is set and recorded. It is possible. If you do so, a 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 is needless to say 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 SRID or PHID rewriting operation when ID data is recorded as shown in FIG. 11 will be described. Here, the case of rewriting the PHID 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, for the contents of items other than PHID, the contents recorded before need to be saved. Here, the overall operation timing and the like are the same as those in the above-described embodiment. That is, when a new set of PHID is recorded on the recorded tape, the above (1) to (4)
Alternatively, the operations (11) to (14) are performed. However, the SRI included in the new sub data 1, sub data 2, and 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 (case shown in FIG. 4), in the insert editing operation,
The state ((3) or (13)) in which the tape is running in the reproduction state changes from a certain timing to the mode ((4) or (14)) in which the subcode area is rewritten. In this embodiment, the new sub data 1 is the instant when the sub data 1 (absolute position information) detected by the sub data 1 detector 37 during the reproduction state is changed to the rewriting mode (that is, the sub data 1 detector). It is created by incrementing the sub data 1 generator 15 from the moment when the sub data is not input from 37). Similarly, sub data 2 (user information) is
It is created by the sub data 2 detector 38 and the sub data 2 generator 16.

As for the SRID, the same contents as the information detected by the ID data 1 detector 35 during the traveling in the reproducing state are recorded. If the SRID is set and recorded, it may be recorded over a section longer than the predetermined recording section, but there is no practical problem at all.

As for APID, the I
The same contents as the information detected by the D data 1 detector are recorded. Due to the nature of APID, the previously recorded information can be completely saved even if it is created in this way.

With respect to PN0, since the PHID is reset and recorded, it does not make sense to record any number. Here, the number corresponding to such a case is the ID
It is assumed to be 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) recorded on the track is created.

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

The operation is also the same in principle when the SRID is rewritten. For the new PHID, the same contents as the information detected by the ID data 1 detector during traveling in the reproduction state are recorded.

If information other than PHID or SRID to be rewritten is newly created by the method as described above, the previously recorded contents can be saved even in the rewriting section. of course,
The PHID or SRID can be rewritten as described with reference to FIG. 7 or 10 as in the case of the above-described embodiment.

Therefore, the PHID is newly added to the recorded tape.
Alternatively, when the SRID set recording section is reset and rewritten, only the desired set recording section can be reset and 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 simultaneous recording on 2 channels is shown, but the combination and arrangement of the rotary heads are not limited to this embodiment and can be similarly applied to other cases.

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

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

Further, although the case of the apparatus for recording the video signal is shown in the present embodiment, it goes without saying that the present invention also includes the case of recording the audio signal as well.

In this embodiment, there are two types of tracking pilot signals, but it is 8 mmVT.
It is also possible to use pilot signals of four kinds of frequencies as used in R, and it is also possible to change the recording location of the pilot signals such as DAT to record the kinds of pilot signals. There is no limitation on how to put it.

In this embodiment, the tracking control is performed by using the pilot signal frequency-multiplexed in the tracking signal area at the head of the track. However, only the positioning information signal at the time of editing is recorded in the tracking signal area. As for the tracking control, control using a control signal recorded on a linear track at the end of the tape may be performed as in a conventional VHS system VTR.

[0090]

As is apparent from the above description, according to the present invention, when a plurality of cue information is recorded by rewriting and editing within a predetermined section in which cue information is set and recorded. Also, it is possible to erase only the desired cueing information. Thus, by applying the recording / reproducing method of the present invention to a VTR or the like, it becomes possible to realize a device having an excellent rewriting / editing function for cue information.

[Brief description of 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 view 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 according to an embodiment of the present invention.

FIG. 4 is a diagram showing the 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 according to an 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 a track position at the time of insert editing in an embodiment of the present invention.

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

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

FIG. 10 is a diagram showing a flow of operations and a track position during insert editing according to an embodiment of the present invention.

FIG. 11 is a subcode ID according to an embodiment of the present invention.
The figure which shows the other example of the contents and arrangement of section and data section

[Explanation of symbols]

 1 Magnetic Tape 2a, 2b Rotating Head 3 Cylinder 4 Capstan Motor 5 Pinch Roller 6 Capstan Control Circuit 7 Tape Running Device 8 Video Signal Generator 9 Clock Generator 10 Segmenting Circuit 11 Frame Sync Signal Generator 12 Tracking Signal Generator 13 ID data 1 generator 14 ID data 2 generator 15 Sub data 1 generator 16 Sub data 2 generator 17 Sync generator 20 Combiner 21 Sub code generator 22 Recorder 23 Rotating head controller 24_0-24_9 Track 25 Video Signal area 26 Sub-code area 27 Positioning information signal area 28 Tracking signal area

Claims (1)

[Claims] 1. A recording / reproducing method in which a subcode area for recording cueing information is provided in a part of an inclined track on a tape, and the cueing information is set and recorded over a predetermined section in the tape traveling direction. Then, when the cueing information is reset and rewritten, a set recording end point of the cueing information is detected and reset and rewritten at least to the set recording end point.