JPH0714247A - Method for data recording and reproduction - Google Patents

Abstract

PURPOSE:To realize excellent searching information-rewriting and editing function by detecting existence of searching information set signal recording start point within the rewriting section. CONSTITUTION:In the case of set rewriting of searching ID in the section corresponding to 150 frames starting from the point P3, existence of the set recording start point of SRID in this section is detected first and thereafter set recording is carried out in the section L1 starting from the point P1, set recording is then carried out up to the point P3 and set recording is performed in the section L5. Thereby, both set recording start points before and after the rewriting can be discriminated and thereby the searching information rewriting and editing function can be improved.

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, audio and data on a tape together with a subcode and reproducing the recorded information, and particularly recording / reproducing for recording an editable subcode. It is about the method.

[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 on a recording medium, 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 Tape recorder), 8 mmV
TR etc. are mentioned. It is well known that, in the DAT or 8 mm VTR standard, it is possible to edit the recorded video signal or audio signal while retaining the recorded video signal and re-recording only the subcode. 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.

[0004]

However, the conventional subcode, particularly the method for rewriting the cue information, has the following inconveniences.

For example, it is assumed that a cue ID is set and recorded at a certain position on the tape for 9 seconds. Here, 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, the conventional method is
In addition to 4 seconds, set recording is performed for another 9 seconds, so that the cue ID is continuously set and recorded for a total of 13 seconds, that is, an accurate set recording start position of the newly recorded cue ID cannot be determined. was there.

It is also assumed that when a new cueing ID is set and recorded for 9 seconds, a set recording start point of the previously recorded cueing ID is present in the corresponding section. For example, at a position 4 seconds after the position where a new cue ID is about to be set and recorded,
Consider a case where there is a set recording start position of a cue ID previously recorded (a cue ID previously recorded was also set and recorded for 9 seconds). In this case, according to the conventional method, the cue ID is additionally set and recorded within 4 seconds before the section previously set and recorded.
Cue ID is set and recorded continuously for 3 seconds.
That is, there is a problem in that the exact set recording start position of the cue ID previously recorded cannot be determined.

The above two problems are that when the recording start position of the cue ID has an important meaning (for example, when scene switching is indicated), the editing is performed according to the position of the ID. Inconvenience occurs.

An object of the present invention is to provide a recording / reproducing method in which a subcode area for recording cueing information is provided, regardless of which section the cueing information has been previously recorded. (EN) A recording / reproducing method devised so that both a previously recorded set recording start position and a newly recorded set recording start position can be identified even after a set rewriting of usage information.

[0009]

In order to solve the above-mentioned problems, a recording / reproducing method of the present invention is 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. In the method, at the time of rewriting the set of the cueing information in the subcode area, first, the presence or absence of a set signal recording start point of the cueing information in the rewriting corresponding section is detected, and the set signal recording is started. If there is no point, first place in the information recording place for cueing.
Of the set signal is recorded over the second predetermined section, and then the set signal is recorded over the second predetermined section. Further, when there is the set signal recording start point, the reset signal is recorded at the cue information recording location. 3, the reset signal is recorded over a predetermined section, and then the set signal is recorded up to a fourth predetermined section before reaching the set signal recording start point, and then the reset signal is recorded over the fourth predetermined section, and thereafter. The recording / reproducing method is characterized in that the set signal is recorded over the fifth predetermined section.

[0010]

According to the present invention, at the time of rewriting a set of cueing information, if there is no set recording start point of the cueing information previously recorded in the set rewriting applicable section, the set recording start point is over a predetermined section. The set signal is recorded after the reset signal is recorded. If there is a set recording start point of previously recorded cueing information, first, a reset signal is recorded over a predetermined section, and then the recording start point of the previously recorded cueing information is reached. The set signal is recorded up to this side, then the reset signal is recorded over a predetermined section, and then the set signal is recorded.

Therefore, even when the cueing information is newly set and recorded in the middle of the section where the cueing information has been previously set and recorded, the recording start point can be identified. Further, even when there is a set recording start point of cueing information previously recorded in the set rewriting applicable section, it is possible to identify the set recording start point of the cueing information previously recorded.

[0012]

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

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

In FIG. 1, 1 is a magnetic tape, 2a, 2
Reference numeral b is a rotary head attached to a cylinder (not shown), and 24-0 to 24-9 are tracks formed on the magnetic tape 1. Reference numeral 7 denotes a tape running device, which is composed of a capstan motor 4, a pinch roller 5, and a capstan control circuit 6. Reference numeral 8 is a video signal generator, 9 is a clock generator, 10 is a segmenting circuit, 11 is a frame synchronization signal generator, and 12 is a tracking signal generator. 21 is a subcode generator,
It is composed of an ID data 1 generator 13, an ID data 2 generator 14, a sub data 1 generator 15, a sub data 2 generator 16, a sync generator 17, and a combiner 20. further,
Reference numeral 22 is a recorder, and 23 is a rotary head controller. This embodiment is an example in which two tracks are recorded and reproduced substantially simultaneously by the rotary heads 2a and 2b. FIG. 2 is a view showing the arrangement of rotary heads on a cylinder used in the magnetic recording / reproducing apparatus of this embodiment, and 3 is a cylinder, and 2a and 2b are heads.

In each track on the magnetic tape of FIG. 1, a tracking signal area 2 formed at the head of the track
A positioning signal area 27 is provided in a part of 8 to record the positioning signal. A relatively high frequency is selected for this positioning signal, which is unlikely to be affected by the adjacent track. Also,
A tracking pilot signal is frequency-multiplexed and recorded in the tracking signal area 28. This pilot signal has two different frequencies f1 for every other track.
Alternately recorded at 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, 3 per second
A video signal of 0 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 synchronization signal generator 11 generates a 30 Hz frame synchronization 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 signal is generated in the sync generator 17. 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 referred to as a sync block (hereinafter abbreviated as 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 segment number of the ID data 1 is 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 the 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.

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).

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

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 SB (S
B0-SB11). As shown in FIG. 3B, 1SB 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. The ID section 110 has 2 bytes of ID data 111 (ID0 and ID
1 is recorded in 1 byte), and IDP 112 is recorded in 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. This IDP 112 is a sync unit 1 in the SB.
This is a signal for detecting (and further correcting) a reading error of the signal from 00 to the ID section 110. By recording the IDP 112 at this position in 1SB, if the sync unit 100 to the ID unit 110 can be read, ID0, I
The ID data 111 recorded as D1 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) an error in reading a 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, and 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 S in the subcode area 26 in one track.
This is for identifying any of B11. next,
Two bits of the block identification code 114 are recorded. Figure 4
As is clear from the above, there are four blocks that can be formed by combining the ID data 1 and 2 and the sub data 1 and 2 in one frame. It is for identifying the block. Then, one bit of the SRID 115 is recorded. Furthermore, program numbers PN2 to PN0 (116)
Are recorded with a total of 9 bits. The SRID 115 and the program numbers PN2 to PN0 (11
In 6), the same one is recorded.

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 114 having the same meaning as in the case of the ID data 1
Is recorded in 2 bits. Then, the next 2 bits 117 records b'00 '. Then, APID 118 is recorded in 2 bits and COID 119 is recorded in 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. The block identification signal 114 of track numbers 3 and 4 is b'01 ', and the block identification code 114 of track numbers 5 and 6 is b'10'. Also, S
0 to 11 are recorded as the B 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 layout and contents of the sub data 121. In FIG. 5, only the sub-data 121 of the data part 120 recorded in each SB of the sub-code area 26 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. In addition, the recording date (T1 (125)) is recorded in track numbers 5 to 9.
And the recording time minute second (T2 (126)) are alternately recorded for each SB. However, ATC123, TC124,
T1 (125) and T2 (126) are ITE if necessary.
It is recorded together with the M identification header so that the content can be identified by the identification header during reproduction.

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, the 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 code can be inserted at an arbitrary position after recording, it is very effective in searching for a desired scene. . However, in this case, other subcode information (APID, COID, absolute position information, user information) needs to be stored. That is, it is a very effective function that the subcode can be edited individually.

Next, the editing operation will be described with reference to FIG. In FIG. 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, and 35 is an ID.
A 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 case where the cue ID (SRID) is set and rewritten on the tape for 5 seconds (150 frames) will be described. In general, the program number cannot change in the SRID set recording section. Therefore, if the program number of the section in which the SRID is rewritten is known, there is no problem in rewriting the SRID and the program number at the same time.

First, the case shown in FIG. 7 will be described.
In this case, as shown in FIG.
The SRID is set and recorded in the section L4 starting from 4 (corresponding to 150 frames in the section L4), and there is a request to newly find the point P2 in front of it, and in order to find the point P2. This is a case where the SRID is set and recorded. However, from point P2 to 1
A section corresponding to 50 frames ((L2 + L3 in FIG. 7
The section (+ L5)) is the rewriting applicable section, and the set recording start point P4 of the previously recorded SRID exists in the middle thereof. The rewriting of the SRID set in such a case will be described.

First, the outline of the operation will be described. (1) Section starting from point P2 (L2 + L3 + L
5) is reproduced to detect the presence or absence of the SRID set recording start point in the section. In this example, the case where the SRID recording start point is in the section (L2 + L3 + L5) will be described. The case where there is no SRID recording start point will be described later with reference to FIG.

(2) After reproducing the section L3, the tape is rewound. The amount of rewinding at this time is determined so as to satisfy the following conditions.

1. The rewind end point P5 is located on the tape before the point P1 (P1 is the SRID reset recording start point and will be described in detail later), and tracking is performed while traveling from the rewind end point P5 to the point P1. The pull-in is completed, and the data recorded in the sub-code area should be sufficient to reproduce one or more frames.

2. If the rewind amount is too large, the time required for editing operation will be long, so the value should be as small as possible.

(3) The tape is reproduced and the data in the subcode area required when rewriting the SRID is detected.

(4) The SRID is reset and recorded in the section L1 starting from the point P1. The section L1 has a length corresponding to 10 frames, that is, the point P1 is 10 frames before the point P2.

(5) The SRID is set and recorded in the section L2 starting from the point P2. The section L2 is a section starting from the point P2 to the point P3, and the point P3 is the point P4 (the SRID recorded before).
This is the point before the section L3 (corresponding to 10 frames) from the set recording start point of.

(6) The SRID is reset and recorded in the section L3 starting from the point P3. (7) The SRID is set and recorded in the section L5 starting from the point P4. The section L4 corresponds to a length obtained by subtracting the length of the section (L2 + L3) from the section corresponding to 150 frames. Here, the length of the section (L2 + L3) is the point P2 (the point at which a new SRID is set and recorded).
To the point P4 (set recording start point of previously recorded SRID).

As described above, 1 starting from point P3
When the cueing ID is set and rewritten in the section corresponding to 50 frames, first, the presence or absence of the SRID set recording start point in the section is detected (in this case, SRI).
(There is a set recording start point of D) After that, first, after reset recording in the section L1 starting from the point P1,
Set and record by point P3, and further point P3
Reset recording to section L3 starting from, and section L5
Make sure to record as a set.

Next, the operations (1) to (5) described above will be described in detail. (1) Detection of Presence / Absence of SRID Set Recording Start 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. 7, the track 24-1
Tracking is performed so that 0 is scanned. Now, when the rotary head 2a scans the tracking signal area 28 of the track 24-10, both adjacent tracks 24-
The leak components of the different pilot signal components f1 and f2 recorded in 9, 24-11 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, as the tracking error detector 30, a known detector that compares the magnitudes of the f1 component and 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 rear track.

For example, the rotary head 2a has a track 24-
When 10 is scanned, a value proportional to the difference between the pilot component included in the tracking signal region of track 24-11 and the pilot component included in the tracking signal region of track 24-9 is output. . Since the rotary head 2b is arranged very close to the rotary head 2a and the relative positional relationship between the rotary head 2a and the rotary head 2a can be accurately ensured, the rotary head 2a and the track 24-10 are tracked to track the rotary head 2b and the track 24a. -11
Tracking with and can 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 playback state in a section corresponding to 150 frames from point P2, and the SRI
It is detected whether a reset signal or a set signal is recorded as D. In the case described here, it is assumed that the recording start point P4 of the set signal can be detected. As described above, in the recording / reproducing apparatus according to the present embodiment, the absolute position information is recorded as the sub data 1 in the sub code area. Therefore, it is easy to calculate the point P3 from the absolute position information of the point P4. Similarly, from point P2 to point P
It is also possible to calculate 1. The point P1 is calculated by the edit indicator 33 based on the absolute position information at the point P2 detected by the sub data 1 detector during reproduction. Further, the edit indicator 33 calculates the point P3 based on the absolute position information at the point P4.

Also, the position of the end of the section corresponding to 150 frames from the point P2 is the absolute position information (sub data 1
(Detected by the detector 35), and when the tape reaches that position, the operation (2) is performed.

(2) Rewinding operation of tape The edit instructing device 33 instructs the capstan control circuit 6 to perform the 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 when recording (-
(3 times speed). Now, when the rewinding is completed, the information of the subcode area recorded on the tape is reproduced while rewinding, the absolute position information is detected by the subdata 1 detector 37, and the predetermined position from the absolute position corresponding to the point P1 is detected. Just rewind it extra and then stop. Here, it is assumed that the section is rewound by an amount corresponding to 10 frames more than the point P1, and that point is the point P5 in FIG.

(3) Playback of 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 1 When the tape is run in the reproducing state and the point P1 is reached, the ID data 1 is rewritten according to the instruction from the edit instructing device 33. The point P1 is determined from the absolute position information detected by the sub data 1 detector 37 based on the reproduction signal. In the section L1, S of ID data 1
Reset and record the RID.

When the ID data 1 is rewritten, the rotary heads 2a, 2 and the mode for recording the recording signal produced by the recording device 22 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, new sub data 1 is created by the sub data 1 detector 37 and the sub data 1 generator. Further, new sub data 2 is created by the sub data 2 detector and the sub data 2 generator. The created sub data 1 and sub data 2 are input to the combiner 19.

Since the ID data 2 is not rewritten here, details of the creation of the ID data 2 (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 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. This instruction signal is (150
+10) section corresponding to the frame ((L1 + L in FIG. 7
2 + L3 + L5) is output. That is, (4)-
It is output while performing the operation of (7).

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 reproduction 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 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 is input to the first delay circuit 32b and the second delay circuit 32c. 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 the point P2.

(5) SRID set recording 1 If point P2 is reached in the operation of (4),
The SRI of the ID data 1 according to the instruction from the edit indicator 33
The set signal is recorded as D. The point P2 is discriminated from the absolute position information detected by the sub data 1 detector 37 based on the reproduction signals from the tracks 3 and 4. The only difference between the operation (4) and the operation (4) is that a set signal is created instead of a reset signal as an SRID in the ID data generator 13, and other operations are exactly the same. Therefore, duplicate description will not be given.

(6) SRID reset recording 2 If point P3 is reached in the operation of (5),
The SRI of the ID data 1 according to the instruction from the edit indicator 33
The reset signal is recorded as D. The point P3 is determined from the absolute position information detected by the sub data 1 detector 37 based on the reproduction signals from the tracks 3 and 4. The operation here is the same as the operation (4), and is performed until the point P4 is reached.

(7) SRID set record 2 If point P4 is reached in the operation of (6),
The SRI of the ID data 1 according to the instruction from the edit indicator 33
The set signal is recorded as D. The point P4 is discriminated from the absolute position information detected by the sub data 1 detector 37 by the reproduction signals from the tracks 3 and 4. The operation here is the same as the operation (5),
Perform over the section L5. 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. When the SRID is recorded in this way, the newly recorded SRID set recording start position and the previously recorded SRID set recording start position can be detected or identified without fail. That is, even at the SRID recording start position after the set rewriting, the SRID always switches from the reset to the set. Therefore, by searching such a point, the SRID set recording start position after the rewriting can be searched. . This is a very effective method when it is necessary to accurately determine the set recording start position of the SRID after rewriting.

Next, the case shown in FIG. 10 will be described. In this case, as shown in FIG. 10A, the section L11 previously started from the point P11 (the section L11 is 150
This is a case in which the SRID is set and recorded in (corresponding to a frame), and a request for new cueing is made at a point P13 on the way, and the SRID is set and recorded in order to cue the point P13. However, the section corresponding to 150 frames from the point P13 (section L13 in FIG. 10) is the rewriting applicable section, and there is no set recording start point of the SRID previously recorded in the section. The rewriting of the SRID set in such a case will be described. It should be noted that the only difference from the case shown in FIG. 7 is the section in which set recording and reset recording are performed as SRID, and the other sections are shown in FIG.
The detailed description is omitted because it is the same as the case shown in FIG.
Therefore, only the outline of the operation will be described.

(A) Section L1 starting from point P13
3 is reproduced, and the presence or absence of the SRID set recording start point in that section is detected. In this example, the section L
A case where there is no SRID recording start point in 13 will be described. The case where there is an SRID set recording start point has already been described with reference to FIG.

(B) When the reproduction of the section L13 is completed,
Rewind the tape. The amount of rewinding at this time is determined so as to satisfy the following conditions.

1. The rewind end point P14 is closer to the position on the tape than the point P12 (P12 is the SRID rewrite start point and will be described in detail later), and the tracking pull-in is performed while traveling from the rewind end point P14 to the point P12. Is completed, and the data recorded in the sub-code area is sufficient to reproduce one or more frames.

2. If the rewind amount is too large, the time required for editing operation will be long, so the value should be as small as possible.

(C) The tape is reproduced, and the data in the subcode area required when rewriting the SRID is detected.

(D) Section L1 starting from point P12
2 SRID is reset and recorded. The section L12 has a length corresponding to 10 frames, that is, the point P
12 is 10 frames before point P13.

(E) Section L1 starting from point P13
Set and record SRID in 3. In addition, section L13 is 1
This corresponds to 50 frames. The section L11 also corresponds to 150 frames.

As a result of the above operation, a cue ID (SRID) as shown in FIG. 10C is recorded on the tape as a result. Note that the ID data 2, the sub data 1, and the sub data 2 are stored in this case as well, according to the same operation principle as that described with reference to FIG. 7. If the SRID is recorded in this way, the newly recorded SR
Set recording start position of ID and SR previously recorded
The set recording start position of the ID can be detected or identified without fail. That is, SRID after set rewriting
Since the SRID is always switched from the reset to the set at the recording start position, the set recording start position of the rewritten SRID can be searched by searching such a point. These effects are similar to those in the case shown in FIG. This is a very effective method when it is necessary to accurately determine the set recording start position of the SRID after rewriting.

FIG. 11 shows another example of the contents and arrangement of the ID data 111 and the sub data 121 of the sub code. 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 4 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
As (132), 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 the section is recorded in the section where the PHID is set and recorded. Is possible. By doing so, a VTR having an 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 a recorded tape, the above (1) to (7)
Or the operations (A) to (5) are performed. However, in (4) to (7) or (D) and (E), the method of creating new sub data 1, sub data 2, and SRID, APID, and PN0 included in ID data is different from that described above. different.

As described in the above embodiment (case shown in FIG. 4), in the insert editing operation,
A mode ((4) to (7) or (D), in which the subcode area is rewritten from a certain timing when the tape is running in the reproducing state ((3) or (C)).
(E)). In this embodiment, the new sub-data 1 is the sub-data 1 during running in the reproduction state.
Sub data 1 detected by the detector 37 (absolute position information)
Is generated by incrementing by the sub data 1 generator 15 from the moment when the sub data 1 is not input from the sub data 1 detector 37 (that is, the moment when the sub data is not input from the sub data 1 detector 37). Similarly, the sub data 2 (user information) 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 will be recorded over a section longer than the predetermined recording section, but there is no practical problem at all.

As for APID, 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.

Regarding PN0, a new set record P
Record the number according to the HID. Here, it is assumed that a desired number is created in the ID 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, the PHID rewriting section (both reset recording section and set recording section)
Create information other than PHID in.

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 the 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 is the same as in FIG.
Alternatively, it is recorded as described with reference to FIG. Therefore, even when the PHID or SRID is newly set and recorded on the recorded tape, the recording start position can always be detected, as in the case of the above-described embodiment.

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

Furthermore, in the present embodiment, an example in which a subcode area is provided between the tracking signal area and the video signal area has been shown, but the location on the track where the subcode area is provided is not limited. For example, it may be provided in the 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.

Further, in the present embodiment, the case where a video signal of 30 frames per second is created has been 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, in the present embodiment, the case of the apparatus for recording the video signal is shown, but 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, but only the positioning information signal at the time of editing is recorded in the tracking signal area. For tracking control, V of the conventional VHS method is used.
The control using the control signal recorded in the linear track at the end of the tape as in TR may be performed.

[0116]

As is apparent from the above description, according to the present invention, when the set rewriting is performed from the middle of the section in which the cueing information is previously set and recorded, or when the cueing information is newly set. Even when the set recording start point of the cueing information previously recorded is present in the section where the set recording is to be performed, it is possible to identify both the set recording start point before and after the rewriting.
Thus, if the recording / reproducing method of the present invention is used for a VTR or the like, it is 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 diagram of a rotary head on a cylinder in a magnetic recording / reproducing apparatus to which the recording / reproducing method of the present invention can be applied.

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 during insert editing in an embodiment of the present invention.

FIG. 8 is a configuration diagram of an edit timing generator according to an embodiment of the present invention.

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 in 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 Index generator 22 Recorder 23 Rotating head controller 24-0 to 24-9 Track 25 Video signal area 26 Subcode 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 a slanted track on a tape, when a set of the cueing information in the subcode area is rewritten. First, the presence / absence of a set signal recording start point of the cueing information in the rewriting relevant section is detected, and if there is no set signal recording start point, a first predetermined information is recorded at the cueing information recording location. A reset signal is recorded over a section and then a set signal is recorded over a second predetermined section. When the set signal recording start point is present, a third predetermined section is set at the cue information recording location. The reset signal is recorded over the set signal, and then the set signal is recorded up to a fourth predetermined section before reaching the set signal recording start point, and then the fourth predetermined section. Recording and reproducing method recording a reset signal, and wherein subsequently to which is adapted for recording set signal over a fifth predetermined interval over.