JPH0714248A - Method for data recording and reproduction - Google Patents

Abstract

PURPOSE:To obtain a recording and reproduction method which enables identification of the recording start positions of respective still images in the case of continuously recording a plurality of still images. CONSTITUTION:A subcode including searching ID of still image information and a still image information are recorded in the inclined tracks on a tape. On the occasion of continuously recording a plurality of still image information and searching ID, a reset signal is then recorded for the predetermined section L2 between respective searching IDs. Thereby, the recording start positions of still images can be identified, realizing searching function of the still images.

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 still image information on a tape together with cueing information and reproducing the recorded information.

[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. Here, needless to say, the merit of digitally recording the video information is that the quality of the reproduced image can be improved. In such a high image quality VTR, it may be considered that a plurality of different still images are continuously recorded.

On the other hand, when recording an information signal, normally,
Record including subcode. Here, the subcode is
It is a code attached to the information signal, such as a cue ID indicating a data recording start position, an absolute time code indicating an absolute position on the tape, and a user time code determined by the user. An example of recording such a subcode is:
DAT (Digital Audio Tape re)
corder), 8 mm VTR and the like. The subcode is recorded in consideration of the head scan so that it can be detected even during high-speed search in which the head scan diagonally crosses the track.

Further, assuming a case where a plurality of different still images are continuously recorded as described above,
I for cueing the switching point of the still image
The merit of recording D is great. That is, I
By detecting D, it is possible to perform a high-speed search for a still image switching point. Generally, a set cue ID for a certain section is set and recorded from a desired point where a cue is desired to be performed, and the set and recorded cue ID is set during high speed search.
To detect.

[0005]

However, in the above-mentioned conventional recording / reproducing method, no consideration is given to the recording method of the cueing information for still images when a plurality of still images are continuously recorded. Not not.

Generally, if the tape format in the recording / reproducing apparatus and the maximum tape speed at the time of high-speed search for the cueing information are determined, a set recording of cueing information necessary for realizing the cueing function is performed. Time (section length)
Is decided. In order to search at a higher speed, it is necessary to set and record the cueing information for a longer time (section). However, if the set recording time of the cue information is too long, the operability of the apparatus is deteriorated. The set recording time of the cue information is determined in consideration of them.

Now, it is assumed that a recording operation of recording a still image together with cue information for 4 seconds and then recording another still image for 4 seconds is repeated. At this time, the cue information is continuously set and recorded including the switching point of the still image, that is, the high-speed search using the cue information cannot be performed.

An object of the present invention is to search for the switching of still images by searching the set recording start point of the cueing information even when the still image information is continuously recorded together with the cueing information. The present invention provides a recording / reproducing method that enables the above.

[0009]

In order to solve the above-mentioned problems, a recording / reproducing method of the present invention is a recording method for recording still image information and a subcode including information for cueing still image information on an inclined track on a tape. A reproducing method, wherein when a plurality of still image information and cueing information are continuously recorded, a reset signal is recorded in a predetermined section between the two cueing information. Is.

[0010]

According to the present invention, when continuously recording still images, a reset signal is recorded as cue information in a predetermined section. Therefore, in the high-speed search operation, the switching position of the still image can be searched by searching the point where the cueing information is reset and switched to the set.

[0011]

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

FIG. 1 is a block diagram showing the 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 still image signal generator, 9 is a clock generator, 10 is a segmenting circuit, 11 is a frame synchronization signal generator, and 12 is a tracking signal generator. 21 is a subcode generator,
It is composed of an ID data 1 generator 13, an ID data 2 generator 14, a sub data 1 generator 15, a sub data 2 generator 16, a sync generator 17, and a combiner 20. further,
Reference numeral 22 is a recorder, and 23 is a rotary head controller. This embodiment is an example in which two tracks are recorded and reproduced substantially simultaneously by the rotary heads 2a and 2b. FIG. 2 is a view showing the arrangement of the rotary heads on the cylinder in this embodiment.
Is a cylinder.

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

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

The still picture signal generator 8 produces a video signal corresponding to 30 frames per second (one frame is one screen of a television). The video signal created here is still image information, and a different still image is created every 6 seconds (180 frames). The segmenting circuit 10 divides a signal of one frame into 10 segments. Finally, one frame of the video signal is divided into 10 tracks and recorded. The segmented video signal (still image 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 an image number. Well, SRI
Generation of D will be described. As described above, the still image signal generator 8 switches to a different still image every 6 seconds (180 frames) and outputs a video signal. ID data 1
If the generator 13 detects that the video signal from the still image signal generator 8 switches to a different still image, SR
Generation of a set signal as the ID is started. After that, the number of frames is counted by the frame synchronization signal of the frame synchronization signal generator 11, and a predetermined number of frames (here, 15
The set signal is continuously generated for 0 frames). Then, for a predetermined number of frames or more (here, 30
A reset signal is generated. The SRID is generated as described above. Details 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 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.

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

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

The rotary head controller 23 controls the rotary heads 2a and 2a 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, tracks as shown in FIG. 1 are 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) a reading error of the signal from the sync unit 100 to the data unit 120 in 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, the ID according to the track number.
The contents of the 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 as ID data on track numbers 0, 1, 2, 7, 8, and 9. 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. Further, the image numbers PN2 to PN0 (116) are recorded with a total of 9 bits. SR within one frame
The same ID 115 and image numbers PN2 to PN0 (116) are recorded.

The block identification code 114 for track numbers 0, 1 and 2 is b'00 ', and the block identification code 114 for track numbers 7, 8, 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 the order of head scanning, first, SB having the same meaning as in the case of ID data 1
The number 113 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 video signals recorded on tape, and TOC ID is TOC.
Indicates whether the section is recorded. In addition, this TOC
Is usually recorded 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'. 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, only the sub-data 121 of the data part 120 recorded in each SB of the sub-code area 26 is shown. On track numbers 0 to 4, an absolute time code (ATC123) and a tape counter value (TC124) are alternately recorded for each SB as absolute position information. Also, the recording date (T1 (12
5)) and recording time minute second (T2 (126)) are also 1 SB
Record alternately for each. However, ATC123, TC1
24, 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 simultaneously recorded, 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.

FIG. 6 shows the correspondence between the still image information to be recorded and the SRID. The still image information is 180 frames (L1 + L
It is switched and recorded every 2). The SRID is first set in the section L1 (150
Frame) set signal is recorded. After that, section L2
During this period (30 frames), the reset signal is recorded. The length of the section L1 for recording the set signal is determined depending on the tape speed at the time of high-speed search realized by the recording / reproducing apparatus. For faster speed search, L1
Need to be long. L1 must be long enough to detect when a search is performed at a prescribed speed even if SRID is not set and recorded over a long section before and after the L1. In this embodiment, the section L
1 has a length corresponding to 150 frames. In addition, section L2
Is important when continuously recording different still images as shown in this embodiment. At this time, it is necessary to have the section L2 in which the SRID is reset and recorded in order to continuously find a plurality of different still images one after another. That is, when the signal recorded as the SRID is switched from reset to set, it can be determined that it is the recording start position of a certain still image. Assuming such usage, the reset signal recording section does not have to be detectable at such a high tape speed. That is, the section L2 does not need to have the same length as the section L1. However, if the section L2 does not exist, the switching point of the still image information cannot be detected. In this embodiment, the section L2 has a length corresponding to 30 frames.

When still image information is continuously recorded, the SRID is recorded as described above, whereby the switching position of still images can be detected. Also,
Since the image numbers PN2 to PN0 (116) are also recorded together with the SRID, the image number can be detected during the search.

FIG. 7 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 there is only one ID data block,
Since there are 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 block in which the sub data 1 is recorded (sub data block 1).
It suffices if the block (sub data block 2) in which the sub data 2 is recorded 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. Further, b'10 'is recorded as a block identification code on the tracks 5 to 9 on which the sub data 2 is recorded. And SRID11
5 is recorded as 1 bit, and INID 131 is recorded as 1 bit.

The SRID 115 is I for locating a section in which a still image is recorded, as in the case of the above-described embodiment.
It is D. The INID 131 is an ID for searching the start position of the program. Here, SRID
Is set and recorded in a section in which a desired image (still image) is recorded, and INID is set and recorded in the start position of the recorded program. Needless to say, the SRID is recorded by the method shown in FIG. Further, the above-mentioned APID 118 of 4 bits and PN0 (132) of 4 bits are recorded. Now, it is assumed that SRID and INID are not set and recorded at the same time. At this time, it is possible to record the number corresponding to the image data as PN0 (132) in the section where the SRID is set and recorded, and record the program number in the section where the INID is set and recorded. .

If the ID data of the subcode is recorded as described above, the SRI is the same as in the above-mentioned embodiment.
The recording start position of a desired still image in which D is set and recorded can be detected. In addition, by recording PN0 (132) as described above, a VTR having a better search function can be obtained.
Can be realized. That is, the INID can be searched while checking the program number, or the SRID 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.

Furthermore, the IDs (SRID and INID) for cueing have a larger amount of information recorded per frame than in the case shown in FIG. Therefore, the number of data (the number of SBs) that can be detected during the high speed search increases, and the reliability of the high speed search is improved. Further, depending on the double speed number, no matter how many times the head scanning is performed, the subcode area of the track of the specific track number in one frame is always scanned. When searching at such a double speed number, if the cue ID is recorded on a specific track in one frame, in the worst case, the ID cannot be detected at all. However, as shown in FIG. 7, the cue ID (SR
If the ID and INID) are recorded, the cue ID can be detected even at the multiple speed having the problem as described above.

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

Further, in the present embodiment, an example in which the subcode area is provided between the tracking signal area and the video signal area is shown, but the position 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 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. Further, even when a moving image and a still image are mixed, recording of the still image is included in the present invention.

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.
Control may be performed using a control signal recorded on a linear track at the end of the tape as is done by an HS type VTR.

[0059]

As is apparent from the above description, according to the present invention, even when a plurality of still images are continuously recorded, it is possible to detect the switching of still images and perform cueing. Become. As a result, if the recording / reproducing method of the present invention is used, it is possible to realize a VTR or the like having an excellent cueing function for still images.

[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 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 still images to be recorded and cue IDs according to an embodiment of the present invention.

FIG. 7 is a diagram showing another example of the contents and arrangement of subcode ID data 111 and subdata 121 in one embodiment of the present invention.

[Explanation of symbols]

 1 Magnetic Tape 2a, 2b Rotating Head 3 Cylinder 4 Capstan Motor 5 Pinch Roller 6 Capstan Control Circuit 7 Tape Running Device 8 Still Image Signal Generator 9 Clock Generator 10 Segmenting Circuit 11 Frame Sync Signal Generator 12 Tracking Signal Generation 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 tracks 25 video signal area 26 subcode area 27 positioning information signal area 28 tracking signal area

Claims (2)

[Claims] 1. A recording / reproducing method for recording a subcode containing information for cueing on a slanted track on a tape, wherein when the information for cueing is recorded continuously, between two pieces of information for cueing. A recording / reproducing method, characterized in that the reset signal is recorded in a predetermined section of. 2. A recording / reproducing method of recording the still image information and a subcode including information for cueing still image information on a slanted track on a tape, wherein a plurality of still image information and cueing are continuously recorded. A recording / reproducing method characterized in that, when information is recorded, a reset signal is recorded in a predetermined section between two cueing information.