JP2002056624A - Device and method for recording magnetic tape, magnetic tape format and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform search reproduction at a prescribed double speed and at two times as fast as the prescribed double speed. SOLUTION: A track for search is allocated to image data for search by depending on which area data the image data for search belongs to between a central part area C (areas C0 to C8) on an image for search and peripheral parts P (areas P0 to P8), further which area data the image data for search belongs to among the nine areas C0 to C8 of the area C or which area data the image data for search belongs to among the nine areas P0 to P8 of the areas P. As a result, the entire image for search is displayed in search reproduction at the prescribed double speed, and the image of the area C or the image of the areas P is alternately reproduced in search reproduction at the two times as fast as the double speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape recording apparatus and method, a magnetic tape format, and a recording medium, and more particularly, to a magnetic tape recording apparatus and method for recording an image on a magnetic tape, a magnetic tape format,
And a recording medium.

[0002]

2. Description of the Related Art MPEG (Moving Picture Experts Group)
In a conventional recording apparatus that records image data compressed by a system or the like on a tape, a normal speed (so-called,
In order to enable reproduction at a speed other than 1 × speed (hereinafter referred to as normal reproduction) (so-called search reproduction), search image data is recorded at a position where the rotary head can trace during search reproduction. Is done. Thus, when search reproduction is performed at a predetermined speed, all of the recorded search image data is read, and one surface of the search image is displayed.

[0003]

However, when search reproduction is performed at twice the speed of search reproduction at which all search image data is read, only half of the data is read. A search image with sufficient image quality cannot be obtained. That is, in this case,
There is a problem that search reproduction can be performed only at one kind of speed.

[0004] The present invention has been made in view of such circumstances, and has as its object to enable search reproduction at both a predetermined speed and twice the speed.

[0005]

According to the present invention, there is provided a magnetic tape recording apparatus comprising: first generating means for coding an input image signal to generate image data; and generating search data based on the image data. And a storage unit for storing image data and search data in a track. The storage unit divides the search image corresponding to the search data into N areas, So that the search data belonging to the area of
The search data is stored in a track.

[0006] The storage means can divide the search image into N areas in the vertical or horizontal direction.

The storage means can store the search data belonging to the N areas in the tracks in a predetermined order.

[0008] The number of tracks for storing the search data of the search image for one screen can be fixed.

The search data is composed of image data and control data, and the storage means can store control data of the search image for one screen in two tracks in an overlapping manner.

According to the magnetic tape recording method of the present invention, a first generating step of generating image data by encoding an input image signal, and a second generating step of generating search data based on the image data And a storage step of storing image data and search data in a track. The processing of the storage step divides the search image corresponding to the search data into N areas and belongs to the N areas. The search data is stored in a track such that the search data is reproduced in a predetermined order.

[0011] The program of the recording medium according to the present invention comprises a first generation step of generating image data by encoding an input image signal, and a second generation step of generating search data based on the image data. And a storage step of storing image data and search data in a track. The processing of the storage step divides the search image corresponding to the search data into N areas and belongs to the N areas. The search data is stored in a track such that the search data is reproduced in a predetermined order.

[0012] The magnetic tape recording apparatus and method of the present invention,
In the program of the recording medium, image data is generated by encoding an input image signal, search data is generated based on the image data, and the image data and the search data are stored in a track. The search data corresponding to the search data is divided into N areas, and the search data is stored in the tracks such that the search data belonging to the N areas are reproduced in a predetermined order. You.

In the format of the magnetic tape of the present invention, when search reproduction data is arranged, data indicating whether the search reproduction data is image data or control data is arranged.

When image data as search reproduction data is arranged, an address of the image data on the image,
The size of the image and the vertical frequency components of the image can be further arranged.

When control data as search reproduction data is arranged, an address on an image can indicate that control data is arranged.

The image data as search reproduction data can include the number of each image data.

The control data as the search reproduction data can include the number of the ECC block unit of the track that stores the head of the normal reproduction image data corresponding to the image data as the search reproduction data.

The control data as search reproduction data can include a number in an ECC block of a track for storing a head portion of normal reproduction image data corresponding to the image data as search reproduction data.

The control data as search reproduction data can include a flag indicating whether or not the image data as search reproduction data is the first image data to be connected.

The control data as search reproduction data can include a sequence header and a picture header as a transport stream of image data for normal reproduction.

The control data as search reproduction data can include a title time code of normal reproduction image data corresponding to the image data as search reproduction data.

[0022]

FIG. 1 shows a configuration example of a recording apparatus to which the present invention is applied. The compression unit 1 compresses the input video signal by an MPEG method such as MPEG @ H-1440 of MPEG2, and generates a search data generation unit 2 and a recording processing unit 3.
To supply.

The search data generator 2 generates image data (hereinafter referred to as a search image) of an image required for search reproduction (hereinafter referred to as a search image) based on the I pictures constituting the image data input from the compressor 1. (Referred to as image data) and supplies it to the recording processing unit 3. The search data generation unit 2 also generates control data (hereinafter, referred to as a search header) necessary for reproducing the search image data,
It is supplied to the recording processing unit 3. For example, as shown in FIG. 2A, when video data of GOP0 or GOP1 consisting of 15 frames is supplied, the search data generation unit 2
The search image data and the search header of one frame of the search image are generated.

The recording processing unit 3 includes the image data (main data) from the compression unit 1 and the search data generation unit 2
In addition to the search image data and search header from
Compressed audio data and predetermined system data (for example, AUX data) are supplied.

The recording processing unit 3 adds an error correction code to the supplied data, multiplexes the data, performs modulation processing and the like, and supplies the data to a rotating head (not shown).
The information is recorded on the magnetic tape 4.

FIG. 3 shows the format of a track formed on a magnetic tape 4 by a recording apparatus to which the present invention is applied. The rotating head (not shown) traces the magnetic tape 4 from the lower right to the upper left in the figure to form a track inclined with respect to the longitudinal direction of the magnetic tape 4. The magnetic tape 4 is transported from right to left in the figure.

Main data, audio data, image data for search, a header for search, and the like are recorded on a predetermined track.

For example, the search image data and the search header are recorded on a predetermined track allocated by the search track allocation process described below. GOP data consisting of 15 frames is recorded on an average of 150 tracks.

Next, the processing procedure of the recording apparatus when executing the search track allocation processing will be described with reference to the flowchart of FIG. Here, 4x speed and 8
A case in which search reproduction can be performed at both double speeds will be described as an example.

First, the outline will be described.

In this search track allocation process, eight GOPs (hereinafter referred to as GOPs 0 to GO
P7) as one processing unit.
Steps S1 to S4 correspond to eight GOPs 0 to GOP
7, the processing is for the four GOPs 0 to 3 previously input, and the steps S5 to S8 are the processing for the four GOPs 4 to GOP subsequently input.

The processing of steps S1 to S4 will be described together. Here, the four GOPs entered earlier
Search image data and a search header of 0 to GOP3 are allocated to a track for recording the data (hereinafter, referred to as a search track).

In the case of this example, as shown in FIG. 5, the search image data or the search header is allocated to search tracks formed every eight tracks, and a portion consisting of 17 sync blocks at the center thereof. (Hereinafter, referred to as a search area) (in the figure, a shaded portion).

For example, as shown in FIG. 6, the search image data is stored in an area C (areas C0 to C8) or a peripheral area (areas C0 to C8) in a central part (open area in the figure) on the search image. Area P (areas P0 to P0) in the shaded area
8), further belongs to which of the nine regions C0 to C8 of the region C, or to which of the nine regions P0 to P8 of the region P The search track to be assigned is determined according to this.

FIG. 7A shows a state in which search image data of four GOPs 0 to 3 is recorded on the search track allocated in this manner. Since the search image data of one GOP is recorded on 18 search tracks, the search image data of 4 GOPs is recorded on 72 (= 18 × 4) search tracks. . On the other hand, all data of one GOP is
Since the data is recorded on an average of 150 tracks including the search track, all of the data of the four GOPs includes an average of 600 (= 150 × 150) including the search track.
4) Recorded on the track.

In the figure, SDTR (n, m) is an expression for specifying a search track. n indicates that the search image data or search header recorded on the search track is 4
One of the GOPs indicates the GOP, and m indicates the order of the search track among the 18 search tracks. That is, n is a variable that changes in the range of values 0 to 3, and m is a variable that changes between values 0 to 17.

In the example of FIG. 7A, SDTR (0,0), SDTR (1,0), SDTR (2,0) formed first among 18 search tracks in each of GOP0 to GOP3. 0), SDTR
The search image data of the area C0 of the area C is recorded on the (3,0) search track, and the search image data of the area P and the search image data of the area C are recorded on the subsequent search tracks. Are recorded alternately. Hereinafter, a pattern in which the search image data is recorded on the search track is referred to as a pattern A.

Normally, in the case of search reproduction at 4 × speed, 8
The search area of the search track for each track is scanned. In this example, when search reproduction is performed at 4 × speed, all of the search image data recorded on the search track is read, and the entire search image (FIG. 6) is displayed.

In the case of the search reproduction at the 8 × speed which is twice the 4 × speed, the search area of the search track for every 16 tracks is scanned. In the case of this example, when the search reproduction at the 8 × speed is performed, the search image data of the area C or the area P is read out alternately and collectively, respectively.
The images of the region C or the region P are displayed alternately. This principle will be described later again.

For example, when the search image data is recorded every eight tracks in the order from end to end on the search image (irrespective of the area C or the area P as shown in FIG. 6). In this case, when the search image data for every 16 tracks is read, the image to be displayed is an image which is very hard to see because the image portion of the search image data that has not been read is thinned out. However,
In the case of the present invention, an easy-to-view image of one integrated area (area C or area P) is displayed.

As described above, four GOPs are processed as one unit and the processing is performed on the basis of the average number of tracks on which data of the four GOPs is recorded, ie, 600 (= 1).
50 × 4) is divisible by 8, which is the number of intervals between search tracks, so that 4 search tracks are provided in every 600 tracks.
All of the GOP search image data (four frame image data) can be recorded. On the contrary,
Since 150, which is the average number of tracks on which data of one GOP is recorded, is not divisible by 8, all of the search image data of one GOP is recorded on search tracks provided for every eight tracks. May not be possible.

On the other hand, as described above, in 600 tracks,
When a search track is provided for every eight tracks, 75
Since (= 600/8) search tracks are created,
Thus, for example, 19 search tracks are assigned to each of the three GOPs out of the four GOPs, and 18 search tracks are assigned to one GOP. That is, search image data of a certain GOP is stored in 18 search tracks, or
GOP search image data must be assigned to 19 search tracks, which complicates the processing.

Therefore, in the present invention, the SDTR (0, 17) search track and the SDTR (1, 0) search track,
R (1,17) search track and SDTR (2,0) search track, and SDTR (2,17) search track and SDTR (3,
The search track 0) is separated by 16 tracks, and a middle track (hereinafter referred to as an adjustment track X) in which meaningless data is recorded is provided in the search area (three adjustment tracks per GOP). Is provided), and by setting the number of search tracks to 72 (= 75−3),
The search image data of one GOP is simply expressed as 18 (=
72 ÷ 4) search tracks can be assigned.

That is, the following equation (1) holds. (8 (number of tracks between search tracks) x 18 (number of search tracks for one GOP)) + 8 (number of tracks between adjustment track and search track) x 3 (for GOP0 to GOP3) + 8 × 18 × 1 (for GOP4) = 600 (1)

That is, steps S1 to S4
In the process (1), the adjustment track X is also allocated in addition to the search track.

Next, an outline of the processing in steps S5 to S8 will be described. Here, among eight GOPs 0 to 7 as one processing unit, a search track for recording the search image data of four GOPs 4 to 7 input later is assigned. Basically, the same processing as in steps S1 to S4 is performed. In this case, as shown in FIG. 7B, of the 18 search tracks in each of GOP4 to GOP7, SDTR (4,0), SDT formed on
R (5,0), SDTR (6,0), SDTR (7,0) search tracks,
The search image data of the area P0 of the area P is recorded, and the search image data of the area C and the search image data of the area P are alternately recorded on the subsequent search tracks. That is, the search image data is recorded on the search track in a pattern (hereinafter, referred to as pattern B) different from the pattern in GOP0 to GOP3 (pattern A).

In steps S5 to S8, an adjustment track X is also assigned, as in steps S1 to S4. That is, by this, the SDTR (4, 17) search track and the SDTR (5, 0) search track, the SDTR (5, 17) search track and the SDTR
An adjustment track X is provided between the (6,0) search track, and between the SDTR (6, 17) search track and the SDTR (7, 0) search track. SDTR (4,0)
7 is also provided at a position separated from the SDTR (3, 17) search track (FIG. 7A) by eight tracks, and the adjustment track X is not provided therebetween.

As described above, the processing of steps S1 to S8 is executed using eight GOPs as one processing unit.

As described above, GOP0 to GOP3
Search image data is recorded in pattern A, and
The search image data of GOP4 to GOP7 is recorded in the pattern B because, in the case of search reproduction at 8 × speed, the area C or the area P on the search image is
This is because the display is performed continuously and alternately.

The search track of SDTR (0, 17) and SDTR (1, 17)
Since the adjustment track X is provided between the search tracks of (0), the search image data of GOP0 and GOP1 recorded on the search tracks in the pattern A respectively are used when the search reproduction is performed at 8 × speed. , By scanning every 16 tracks, for example, as shown in FIG.
In GOP0, the search image data in the area C is reproduced, and the GOP
1, the search image data in the area P is reproduced. That is, when the search reproduction at the 8 × speed is performed for GOP0 to GOP3, the search image data of the region C, the region P, the region C, and the region P are reproduced alternately, and the regions C, P, and Images of C and the area P are displayed alternately.

When the adjustment track X is not provided between the GOPs, for example, as shown in FIG. 9, the image data of the same area (in this case, the area C) is repeatedly reproduced, and the image of the area is continuously reproduced. Will be displayed.
That is, GOP4 search image data is GOP0 to GOP
As in the case of No. 3, when the pattern A is recorded on the search track, the search track of SDTR (4,0) and the GOP
Since the adjustment track X is not provided between the search tracks of the SDTR (3, 17) in No. 3, the image of the same area is displayed as shown in FIG. Therefore, as described above, by recording the search image data in GOP4 (GOP4 to GOP7) in the pattern B, the images in the region C and the region P can be displayed alternately as shown in FIG. .

Next, the processing of steps S1 to S8 will be described for each step.

In step S1, the first input
The process is executed for GOP0. This process is shown in the flowchart of FIG.

That is, in step S21, a search track for recording the search image data is assigned to the search image data.

More specifically, the search data generation unit 2
An I picture is separated from GOP0 supplied from the compression unit 1. Then, the search data generation unit 2 extracts a DC component from each of the luminance signals Y divided into four DCT blocks (8 pixels × 8 pixels) constituting one macro block, and converts the extracted DC components into 6-bit data. Convert to The search data generation unit 2 extracts a DC component from the color difference signals Cr and Cb divided into one DCT block (8 pixels × 8 pixels) constituting one macro block, and converts the DC components into 5-bit data. Convert. The search data generation unit 2
The data thus obtained is supplied to the recording processing unit 3 as search image data.

The recording processing section 3 forms search image data in sync block units (hereinafter, search image data SB).

As shown in FIG. 12, the search image data supplied from the search data generation unit 2 is a macroblock unit (macroblock unit) corresponding to four pieces of luminance data and two pieces of color difference data formed in the search image. Hereinafter, the search image data in macroblock units is referred to as search image data MB). In the case of this example, the number of effective pixels of the luminance data after decoding is 1080 vertically and 1440 horizontally, so one screen of the search image contains 68 (= 1080 ÷) 16) (rounded up by a few) 9 x 9
0 (= 1440/16) macroblocks are formed.

Next, the recording processing unit 3 maps the sync blocks storing the 21 pieces of search image data MB on the search image. Specifically, as shown in FIG. 13, search image data arranged in the vertical direction on the search image
MBs are referred to from the leftmost column in order from top to bottom, and the 21 search image data MBs are mapped as one sync block.

In the case of this example, 6120 (= 68 × 90)
Since there are a plurality of search image data MBs, 291 sync blocks for storing 21 search image data MBs and one (9 (= 6120−219 × 21)) search image data The sync block that stores MB is mapped. That is, a total of 292 sync blocks are mapped on the search image.

In this way, the search image data SB in sync block units is formed.

Next, the recording processing unit 3 allocates a search track for recording the formed search image data SB for each search image data SB.

As shown in FIG. 14, the 18 search tracks on which the search image data SB of one GOP0 is recorded are composed of nine areas C0 to C8 and 9 provided on the search image. Total of 18 areas P0 to P8
Are associated with each other.

As shown in FIG. 15A, the area P0 of the area P is an area corresponding to 14 sync blocks mapped on the search image.

As shown in FIG. 15B, the area C0 of the area C is an area corresponding to 14 sync blocks mapped on the search image.

As shown in FIG. 15C, the area P1 of the area P is an area corresponding to 17 synchro blocks mapped on the search image. Area P of area P
The regions C1 to C7 of the region 2 to P7 and the region C are regions corresponding to 17 sync blocks as in the region P1, and therefore are not shown.

As shown in FIG. 15D, the area C8 of the area C is an area corresponding to 13 sync blocks mapped on the search image.

The area P8 of the area P is an area corresponding to 13 sync blocks mapped on the search image, as shown in FIG. Note that nine search image data MBs are stored in the last sync block of the area P8 (the sync block shaded in the figure).

That is, according to FIG. 14, a search track of SDTR (0,1) is allocated to the search image data SB corresponding to the 14 sync blocks mapped to the area P0 of the area P. The search image data SB corresponding to the 17 sync blocks mapped to the areas P1 to P3 of the area P have SDTRs respectively.
A search track of (0,3), SDTR (0,5), or SDTR (0,7) is allocated.

14 mapped to the area C0 of the area C
A search track of SDTR (0,0) is allocated to the search image data SB corresponding to the sync blocks.
The search image data SB corresponding to the 17 sync blocks mapped to the areas C1 to C7 of the area C include SDTR (0,2), SDTR (0,4), SDTR (0,6), SDTR
A search track of (0,8), SDTR (0,10), SDTR (0,12), or SDTR (0,14) is allocated.

13 mapped to the area C8 of the area C
A search track of SDTR (0, 16) is allocated to the search image data SB corresponding to the sync blocks.

The search image data SB corresponding to the 17 sync blocks mapped to the areas P4 to P7 of the area P include SDTR (0,9), SDTR (0,11), SDTR
A search track of (0,13) or SDTR (0,15) is allocated.

13 mapped to the area P8 of the area P
A search track of SDTR (0, 17) is assigned to the search image data SB corresponding to the sync blocks.

As described above, the track to be arranged in the search image data SB to which the search track is assigned is determined by the SDTR (n, m) of the assigned search track.

As shown in FIG. 15, the sync block mapped on the search image is given a number SB indicating the position of the search track in the search area, and the search block to which the search track is assigned is assigned. The arrangement of the image data SB in the track is determined by the number SB of the corresponding sync block.

As a result, for example, as shown in FIG. 16, the search image data SB in the area C0 includes the numbers SB (3) to SB (3) arranged in the search area of the search track of SDTR (0,0). ) Is stored in each of the sync blocks. Number S
Search headers to be described later are stored in the sync blocks of B (0) to SB (2).

The search image data SB in the area P0 is SDTR
These are stored in the sync blocks of numbers SB (3) to (16) arranged in the search area of the (0, 1) search track. In the sync blocks of numbers SB (0) to SB (2), a search header described later is stored.

The search image data SB in the area C1 is SDTR
They are stored in the sync blocks of numbers SB (0) to (16) arranged in the search area of the (0, 2) search track. The search image data SB in the area P1 is SDTR (0,
Number assigned to the search area of the search track of 3)
These are stored in the sync blocks of SB (0) to number (16), respectively.

The search image data SB in the area C8 is SDTR
These are stored in the sync blocks of numbers SB (0) to (12) arranged in the search area of the (0, 16) search track. The search image data SB in the area P8 is SDTR (0,
These are stored in the sync blocks of numbers SB (0) to (12) arranged in the search area of the search track 17).

That is, as described above, since the search track is assigned to the search image data (search image data SB), the search image data is
The pattern A is recorded on the search track. In addition,
All track numbers are SDTR (n,
m), the number TN represented by SDTR (n, m) attached to the search image data SB.
Are the search tracks for storing the search image data SB.

TN = n × 152 + m × 8

Next, in step S22, the recording processor 3 assigns a search track to the search header.

The search header supplied from the search data generation unit 2 is duplicated, and one of the search headers is assigned the numbers SB (O) to SB (2) of SDTR (0,0). , The other search header contains SB (O) of SDTR (0,1).
To SB (2). As a result, as shown in FIG. 16, the search header includes the sync blocks of numbers SB (0) to SB (2) arranged in the search area of the search track of SDTR (0,0) and SDTR (0,0). These are stored in the sync blocks of numbers SB (0) to SB (2) arranged in the search area of the search track of (0, 1).

As described above, the search header is duplicatedly recorded on the two search tracks because the search area is scanned at intervals of 16 tracks in search reproduction at 8 × speed. If the data is recorded on only one search track, it may not be read out at the time of search reproduction at 8 × speed. This is to prevent this.

Next, in step S23, an adjustment track X is allocated.

As described with reference to FIG. 7A, in this example, the adjustment track X is provided at a position eight tracks away from the SDTR (0, 17) search track. Therefore, the recording processing unit 3 assigns meaningless data to the adjustment track X. Thus, as shown in FIG. 7A, an adjustment track X in which meaningless data is stored is provided in the search area.

Here, for the sake of simplicity, each process has been described in the order of step S21, step S22, and step S23, but these processes may be executed in another order.

Thereafter, the processing ends, and step S in FIG.
Proceed to 2.

At step S2, processing for GOP1 is executed.

Since the processing in step S2 is the same as that in step S1, a detailed description thereof will be omitted, but by this processing, the search image data of GOP1 is shown in FIG. As described above, the pattern A is recorded on the search track.

In step S3, processing for GOP2 is executed.

Since the processing in step S3 is the same as that in step S1, a detailed description thereof will be omitted, but by this processing, the search image data of GOP2 is shown in FIG. As described above, the pattern A is recorded on the search track.

In step S4, processing for GOP3 is performed.

The processing in step S4 is basically the same as that in step S1, and the search image data of GOP3 is recorded on the search track in pattern A as shown in FIG. However, here, the process corresponding to step S23 in FIG. 11 is not performed. That is, here, as shown in FIG. 7A, the adjustment track X is not provided at a position separated by eight tracks from the search track of the SDTR (3, 17).

As described above, the eight processing units forming one processing unit
The processing for the four GOPs 0 to 3 previously input among the GOPs 0 to 7 is completed, and the processing for the four GOPs 4 to 7 input later is performed in steps S5 to S8.

The processing for GOP4 in step S5 corresponds to the processing for GOP0 in step S1. Similarly, the process corresponding to GOP5 in step S6 corresponds to the process for GOP1 in step S2, the process for GOP6 in step S7 corresponds to GOP2 in step S3, and step S8.
The processing in GOP7 in G
Since this is equivalent to the process for OP3,
Although omitted, in this case, as shown in FIG. 17, the search track is associated with each area on the search image in a form different from that of FIG.

For example, taking GOP4 as an example, the search image data SB corresponding to the area P0 on the search image includes S
A search track of DTR (4,0) is allocated. In addition,
In the SDTR (n, m) in steps S5 to S8, n changes from the value 4 to the value 7. m is a value from 0 to 1 as in steps S1 to S4.
It changes at 7.

The search image data SB corresponding to the areas P1 to P3 includes SDTR (4,2), SDTR (4,4), or SDTR (4,4), respectively.
TR (4,6) search track is assigned.

Search image data SB corresponding to area C0
Is assigned a search track for SDTR (4,1).

The search image data SB corresponding to the areas C1 to C7 includes SDTR (4,3), SDTR (4,5), SDTR (4,5), respectively.
7), SDTR (4,9), SDTR (4,11), SDTR (4,13), or SDTR
(4,15) search tracks are allocated.

A search track of SDTR (4, 17) is allocated to the search image data corresponding to the area C8.

The search image data SB corresponding to the regions P4 to P7 includes SDTR (4,8), SDTR (4,10), SDTR (4,
12) or SDTR (4, 14) search track is assigned.

Search image data SB corresponding to area P8
Is assigned a search track for SDTR (4, 16).

That is, as described above, the search image data
Since the SB is allocated to the search track, the search image data of GOP4 to GOP7 is recorded in the search track in the pattern B as shown in FIG.

When the processing in step S8 is completed, that is, when the processing for eight GOPs as processing units is completed, the process returns to step S1, and for the eight GOPs as the next processing unit, A similar process is performed.

In the above, FIG. 14 or FIG.
As shown in FIG. 7, the case where the search image is made to correspond to the area obtained by dividing the search image in the vertical direction has been described as an example. However, as shown in FIG. 18, the search image is made to correspond to the area divided in the horizontal direction. You can also

In the above description, the case where meaningless data is stored in the search area of the adjustment track X has been described as an example. However, main data can also be stored. Further, the main data can be stored in the sync blocks of numbers SB (13) to (16) of the search area of the search tracks of the SDTR (n, 16) and SDTR (n, 17).

Next, the data structure of a sync block arranged on a track will be described.

As shown in FIG. 19A, the sync block has a length of 96 bytes and an 8-bit “sync block common header” from the top.
A 6-bit "sync block header for search" and a 714-bit "data" are stored.

The "sync block common header" contains search image data or a search header, ie, a sync block storing data used in search reproduction or data used in normal reproduction. Data indicating whether the block is a sync block to be stored is stored. This allows the data used in search playback to be
Data used in normal reproduction can be recorded in sync blocks of the same format.

The “sync block header for search” includes
7-bit "SB-X-Address" and 7-bit "
SB-Y-Address, 3-bit GOP Sequence Numbe
r ”, 4-bit“ Picture size ”, 2-bit“ V-Fre ”
q. ”, 1-bit“ OP-data-flag ”is stored.
The remaining 22 bits are reserved. The data stored in these is summarized in FIG.

[0111] In "SB-X-Address" and "SB-Y-Address", among the 21 or 9 pieces of search image data MB stored as search image data SB, the first search image is stored. The X coordinate and the Y coordinate on the search image of the data MB are stored. When a search header is stored in "data", 7Fh is stored therein.

[0112] "Picture size" stores data indicating the image format. "V-freq." Stores data indicating whether the frequency in the vertical direction is 50 Hz or 60 Hz. As described above, since the address on the image of the search image data, the image format, and the vertical frequency are stored, the search image data is decoded into the baseband without waiting for the reproduction of the search header. be able to.

[0113] The "GOP Sequence Number" stores data indicating which GOP among eight GOPs as one processing unit stores search image data or a search header. That is, without depending on the search header, it is possible to determine which GOP the image data for search or the header for search corresponds to,
Even if an error such as a missing search header occurs,
The search image data can be reproduced without being affected by the search.

The 714-bit "data" stores search image data or search header, or data used in normal reproduction.

FIG. 19B shows the structure of search image data SB stored in "data". As described above, 21 (or 9) pieces of search image data MB including four pieces of luminance data (6 bits) and two pieces of color difference data (5 bits) are stored as search image data SB. .

FIG. 19C shows the structure of a search header stored in "data". Here, a 24-bit “absolute track number of ECC block”, a 4-bit “Track address in ECC”, a 1-bit “splicing point identification flag”, a 2-bit “copyright information”, and the remaining bits "TS Sequence header", "TS Picture
“header” and “Title Time Code” are stored.

"Absolute track number of ECC block"
Stores the first track number of the ECC block in which the head of the normal reproduction image data (main data) corresponding to the search image data is located. In this case,
The editing unit of the main data is set to the ECC block unit (16 tracks), and this data is used for a function such as searching for an editing point.

[0118] The "track address in ECC" contains an ECC block.
For each track number, data indicating the track in the ECC block in which the head of the corresponding main data is stored is stored. This is the editing unit ECC bl
It indicates the position of the main data more accurately than the ock, and can accurately find the reproduction point from the search image data.

The "splicing point identification flag" is used to identify whether or not the search image data is of a splicing point. This makes it possible to associate the search image data with the connection shooting point on a one-to-one basis.

[0120] "Sequence Header for TS" and Picture h for TS
"eader" stores header information used in the transport stream. Normally, such information is included in the main data, but can be separately recorded as search data. .

The “Title Time Code” contains the Title Time of the normal reproduction image data corresponding to the search image data.
Code is stored. This is used for cueing and the like.

The above-mentioned series of processing can be realized by hardware, but can also be realized by software. When a series of processing is realized by software, a program constituting the software is installed in a computer, and the program is executed by the computer, so that the above-described recording apparatus is functionally realized.

FIG. 21 is a block diagram showing the configuration of an embodiment of the computer 101 functioning as the above-described recording device. CPU (Central Processing Unit) 1
11 has an input / output interface 11 via a bus 115.
6 is connected, and when a command is input from a user via an input / output unit 118 such as a keyboard and a mouse via the input / output interface 116, the CPU 111, for example, reads a ROM (Read Only Memory) 112, a hard disk 114, Alternatively, a magnetic disk 131, an optical disk 132, a magneto-optical disk 133,
Alternatively, a program stored in a recording medium such as the semiconductor memory 134 is stored in a RAM (Random Access Memory) 1
13 and executed. Thus, the various processes described above (for example, the flowcharts of FIGS. 4 and 11) are performed. Further, the CPU 111 transmits the processing result to, for example, an LCD (Liquid crystal) via the input / output interface 116.
d) (Crystal Display) or the like. The program is stored in the hard disk 114 or the ROM 112 in advance and provided to the user integrally with the computer 101, or provided as package media such as the magnetic disk 131, the optical disk 132, the magneto-optical disk 133, and the semiconductor memory 134. Or can be provided to the hard disk 114 via a communication unit 119 from a satellite, a network, or the like.

In the present specification, the step of describing a program provided by a recording medium may be performed not only in chronological order according to the described order but also in chronological order. This also includes processing executed in parallel or individually.

In this specification, the system is
It represents the entire device composed of a plurality of devices.

[0126]

According to the magnetic tape recording apparatus and method of the present invention and the program of the recording medium, the search image corresponding to the search data is divided into N areas,
The search data is stored in the track so that the search data belonging to the plurality of areas are respectively reproduced in a predetermined order.
Search playback can be performed at both double speeds.

According to the magnetic tape format of the present invention, when search reproduction data is arranged, data indicating whether the search reproduction data is image data or control data is arranged. Therefore, data can be efficiently stored in the track.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an embodiment of a recording apparatus to which the present invention has been applied.

FIG. 2 is a diagram illustrating a method for generating search data.

FIG. 3 is a diagram showing a format of a track on a magnetic tape 4;

FIG. 4 is a flowchart illustrating search track allocation processing.

FIG. 5 is a diagram showing an example of the arrangement of search tracks.

FIG. 6 is a diagram showing an area of a search image corresponding to a search track.

FIG. 7 is a diagram illustrating a state in which search image data is recorded on an assigned search track.

FIG. 8 is a diagram showing search image data to be reproduced.

FIG. 9 is another diagram showing search image data to be reproduced.

FIG. 10 is another diagram showing search image data to be reproduced.

FIG. 11 is a flowchart illustrating details of a process in step S1 of FIG. 4;

FIG. 12 is a diagram illustrating search image data MB.

FIG. 13 is a diagram illustrating a reference order of search image data MB.

FIG. 14 is a diagram showing the correspondence between search image data areas and search tracks.

FIG. 15 is a diagram showing a mapping state of search image data SB.

FIG. 16 is a diagram showing search image data SB stored in a search area of a search track.

FIG. 17 is another diagram showing the correspondence between search image data areas and search tracks.

FIG. 18 is a diagram showing another area of the search image data.

FIG. 19 is a diagram showing a structure of a sync block.

FIG. 20 is a diagram illustrating the contents of a search sync block header.

FIG. 21 is a block diagram illustrating a configuration example of a computer 101.

[Explanation of symbols]

1 compression unit, 2 search data generation unit, 3 recording processing unit, 4 magnetic tape

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomoo Hayakawa 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5C018 LA02 NA00 5C052 AA01 AC05 DD04 DD10 5C053 FA14 FA21 GA10 GA16 GA20 GB01 GB05 GB15 GB38 HA29 HA33 JA03 KA04 KA05 KA24 5D044 AB05 AB07 BC01 CC03 DE02 DE19 DE24 FG24 5D110 AA04 AA28 EA08 EB01

Claims (16)

[Claims] 1. A magnetic tape recording apparatus for recording digital data on a track of a magnetic tape by a rotating head, a first generating means for encoding an input image signal and generating image data, A second generating unit that generates search data; and a storage unit that stores the image data and the search data in the track. An image is divided into N areas, and the search data belonging to the N areas is stored in the track such that the search data is reproduced in a predetermined order. Magnetic tape recorder. 2. The storage means stores the search image,
2. The magnetic tape recording apparatus according to claim 1, wherein the area is divided into the N areas in a vertical direction or a horizontal direction. 3. The magnetic tape recording apparatus according to claim 1, wherein the storage unit stores the search data belonging to the N areas in the track in a predetermined order. 4. The magnetic tape recording apparatus according to claim 1, wherein the number of tracks for storing the search data of the search image for one screen is constant. 5. The search data includes image data and control data, and the storage unit stores the control data of the search image for one screen in two tracks in an overlapping manner. The magnetic tape recording device according to claim 1, wherein: 6. A magnetic tape recording method for a magnetic tape recording apparatus for recording digital data on tracks of a magnetic tape by a rotating head, wherein a first generating step of encoding an input image signal to generate image data; A second generation step of generating search data based on the image data; and a storage step of storing the image data and the search data in the track. The search image corresponding to the search data is divided into N areas, and the search data belonging to the N areas is reproduced in the track so that each of the search data is reproduced in a predetermined order. A magnetic tape recording method characterized by storing. 7. A magnetic tape recording processing program for recording digital data on a track of a magnetic tape by a rotating head, comprising: a first generation step of encoding an input image signal to generate image data; A second generation step of generating search data based on the image data; and a storage step of storing the image data and the search data in the track. The search image corresponding to the search data is divided into N areas, and the search data belonging to the N areas is reproduced in the track so that each of the search data is reproduced in a predetermined order. A recording medium on which a computer-readable program is stored. 8. In a format in which image data for normal reproduction or data for search reproduction is arranged on a magnetic tape on which digital data is recorded on a track by a rotating head, when the search reproduction data is arranged, A magnetic tape format in which data indicating whether the search reproduction data is image data or control data is arranged. 9. When the image data as the search reproduction data is arranged, an address of the image data on the image, a size of the image, and a vertical frequency component of the image are further arranged. The format of a magnetic tape according to claim 8, wherein: 10. The apparatus according to claim 9, wherein when the control data as the search reproduction data is arranged, an address on the image indicates that the control data is arranged. Magnetic tape format. 11. The magnetic tape format according to claim 8, wherein the image data as the search reproduction data includes a number of each image data. 12. The control data as the search reproduction data, wherein the control data as the search reproduction data corresponds to an ECC block unit of the track for storing a head portion of the normal reproduction image data corresponding to the image data. 9. The format of claim 8, including a number. 13. The control data as the search reproduction data, wherein the control data in the ECC block of the track for storing a head portion of the normal reproduction image data corresponding to the image data as the search reproduction data. 9. The format of claim 8, including a number. 14. The control data as the search reproduction data includes a flag indicating whether or not the image data as the search reproduction data is the first image data to be connected. The format of the magnetic tape according to claim 8. 15. The magnetic tape according to claim 8, wherein the control data as the search reproduction data includes a sequence header and a picture header as a transport stream of the normal reproduction image data. Format. 16. The control data as the search reproduction data includes a title time code of the normal reproduction image data corresponding to the image data as the search reproduction data. 8. The format of the magnetic tape according to 8.