JP3185647B2 - Digital signal recording / reproducing method and recording / reproducing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a digital signal recording and reproducing method and a recording and reproducing apparatus, in particular recording the packetized digital signal recording medium about the digital signal recording and reproducing how and reproducing apparatus for reproducing.

[0002]

2. Description of the Related Art Generally, in a digital signal recording / reproducing method for recording and reproducing a digital signal on a recording medium,
Digital signals are recorded and reproduced in data block units. In this case, since the data storage area of the data block has a fixed length, when the digital signal is a packetized signal, conventionally, the packet length is associated with the size of the data storage area, and the track size (the size of the track in the track) is used. The number of data blocks is set to an optimum value for recording and reproduction.

[0003]

However, in recent years, there have been proposed various digital signal transmission standards for digital broadcasting and other digital signals, and these transmission standards have different packet sizes. When recording and reproducing digital signals with different packet sizes in a physical track format, even if the transmission size is optimal for the track size and data block length, depending on the packet size for another transmission standard, the data blocks that make up the track may be different. The number may be inappropriate, the number of data blocks may be fractional, and recording efficiency may decrease, and at this time, addressing and buffering when associating packet data with data blocks in each track becomes complicated. there is a possibility.

[0004] Therefore, it is conceivable to normally record and reproduce digital signals with a dedicated recording / reproducing device conforming to each standard. However, recording and reproducing digital signals with a dedicated recording / reproducing device is uneconomical. It is desired that a single recording / reproducing apparatus can record and reproduce digital signals of different standards with different packet sizes.

[0005] The present invention has been made in view of the above, to provide a digital signal recording and reproducing method and a recording reproducing equipment capable of respectively reproducing the digital signals of different standards of packet sizes by a single device Aim.

Another object of the present invention is to efficiently use a digital signal for trick play reproduced at a different speed from that at the time of recording by using data blocks without excess and deficiency. well to provide a digital signal recording and reproducing method and a recording reproducing equipment capable of reproducing a configuration that addressing can also easily.

[0007]

According to a first aspect of the present invention, there is provided a digital signal recording / reproducing method.
A first transmitting a digital signal of a first packet size;
Digital signal transmission system or second packet size
Digital signal transmission for transmitting digital signals of
System digital signals and tracks on the recording medium sequentially
Recording while forming, digital signal from the formed track
Digital signal recording / reproducing method for reproducing signals
Data having a data size different from the second packet size.
The first or second divided data block using a plurality of data blocks
When recording packet-size digital signals,
When recording a digital signal of 1 packet size, one packet
The packet is stored in two data blocks with additional information
However, when recording a digital signal of the second packet size, 2
One packet into three data blocks with additional information
And storing the first digital signal transmission system and the second digital signal.
Digital signal transmission method
Also, when recording, the packet
This is the least common multiple of the number of data blocks that are
Data blocks of a natural number multiple of 6
It is characterized in that it is recorded on a track of a book .

According to a third aspect of the present invention, there is provided a digital signal recording / reproducing method, wherein a digital signal is reproduced at the same speed as at the time of recording and a normal reproduction data sequence, and n kinds of trick play are reproduced at a different speed from the time of recording. N types of digital signals per track by mixing data signals
Data block recording unit of each digital signal of transmission system
This is a digital signal recording / reproducing method for recording and reproducing the data blocks in a multiple of the least common multiple R of n. The n types of trick-play data sequences have a predetermined fixed track period within each track at a predetermined unique track period. And the total number of data blocks of the data sequence for normal reproduction within the number of tracks of the least common multiple T of each track period is a multiple of the least common multiple R, and
The total number of data blocks of the trick play data sequence for each type within the number of tracks of the least common multiple T is set and recorded as a multiple of the least common multiple R, and is reproduced.

[0009] The digital signal recording and reproducing method according to claim 5, wherein the any one of the number of tracks of the least common multiple T
It is characterized in that the total number of data blocks in the data sequence for normal reproduction in a book track is set to a multiple of the least common multiple R, recorded, and reproduced.

Furthermore, in the digital signal recording and reproducing method according to claim 7, and recorded by setting the normal total number of data blocks for reproducing data series in each track to a multiple of the least common multiple R, and, in each track The total number of data blocks of the trick play data sequence for each type is set to a multiple of the least common multiple R, recorded, and reproduced.

According to a ninth aspect of the present invention, there is provided a recording / reproducing apparatus according to the present invention, wherein packet data of an arbitrary type of digital signal transmission system among N types (N is a natural number of 2 or more) of different packet sizes are used. , An additional information generating means for generating additional information corresponding to the packet data, an adding and storing means for adding the additional information generated by the additional information generating means to the input packet data and temporarily storing the added information, and in response to the digital signal transmission method of the packet data inputted from the storage means divided, p _k pieces of d _k pieces with the packet number of the packet data additional information (p _k, d _k are each a natural number) data blocks of To the packet data and additional information extracted from the dividing means at least in data block units. Adding means for adding header information and the error correction code, the digital signal taken out from the adding means recording medium sequentially formed to record the track, and,
Recording means for recording a data block having a multiple of the least common multiple R of a data block recording unit of each digital signal of N kinds of digital signal transmission systems per track;
A buffer memory for reproducing a digital signal from a recording medium and temporarily storing the reproduced packet data, and controlling the writing and reading of the buffer memory based on additional information and header information in the reproduced digital signal to output a reproduced packet. And control means.

[0012]

According to the first aspect of the present invention, when recording a digital signal of any one of the two types of digital signal transmission systems, packets can be allocated to tracks without excess or deficiency.

According to the third aspect of the present invention, the least common multiple R per track is obtained by mixing a normal reproduction data sequence and n types of trick play data sequences.
And the total number of data blocks of the normal reproduction data series within the number of tracks of the least common multiple T of the track period of each of the n types of trick play data series is a multiple of the least common multiple R. In addition, the total number of data blocks of the trick play data sequence for each type within the number of tracks of the least common multiple T is set to a multiple of the least common multiple R and recorded, and is reproduced. , A packet to be recorded and reproduced within at least the T track period can be completed.

However, according to the third aspect of the present invention, the packet does not straddle at the boundary of the T track, but if there is a trick play data sequence between the tracks within the number of T tracks, the normal reproduction Data sequence packets may span tracks.

Therefore, in the invention according to claim 5 , recording and reproduction are performed by setting the total number of data blocks of the data sequence for normal reproduction in any one track in the number of T tracks to be a multiple of the least common multiple R. I do. As a result, even if a trick play data sequence exists, a packet of a normal reproduction data sequence is completed within a track and does not span between tracks.

Further, in the invention according to claim 7 , the total number of data blocks of the data sequence for normal reproduction in each track is set to a multiple of the least common multiple R and recorded, and each type in each track is recorded. Since the total number of data blocks of the trick play data series is set to be a multiple of the least common multiple R and recorded, all data series packets can be completed within a track.

[0018]

[0019]

[0020]

Next, an embodiment of the present invention will be described. In the present embodiment, two rotating heads provided on the rotating body opposing each other at 180 degrees having different azimuth angles obliquely wind the outer surface of the rotating body obliquely over an angle range of about 180 degrees and have a constant speed. It is assumed that a digital signal of an arbitrary packet size is recorded on a track formed by a helical scan type magnetic recording / reproducing apparatus (VTR) configured to record / reproduce an information signal on a magnetic tape running in the above.

Each track is constituted by arranging a plurality of data areas of a fixed amount called sync blocks corresponding to the above-mentioned data blocks according to the scanning of the rotary head. FIG. 1 shows a format of an embodiment of the sync block. As shown in the figure, the sync block stores an area 1 of a 2-byte synchronization signal (Sync) for reproducing the sync block, an area 2 of 3-byte address information (ID), and stores various information 3. The byte header storage area 3, the 96-byte substantial data storage area 4, and the 8-byte parity area 5 for error correction of the sync block information are combined in a time series of 112 bytes in total. It is a byte configuration.

In this embodiment, the first transmission method MP
A packet assuming a digital signal having a packet size of 188 bytes in a transport packet (TP) transmission system of EG2 (Moving Picture Experts Group 2) and a digital satellite system (DSS) packet transmission system as a second transmission system. A digital signal having a size of 140 bytes is recorded and reproduced with compatibility.

At the time of recording the MPEG2-TS digital signal of the first transmission system, in the present embodiment, the above-mentioned sync blocks are set to SB # n and SB # n + 1 in FIG. A digital signal is repeatedly recorded in units of sync blocks SB # n and SB # n + 1, and reproduced.

Here, in FIG. 2, the sync block S
B # n is the 96-byte data storage area 4 shown in FIG.
Is a 4-byte additional information storage area 10 in which additional information (for example, the arrival time of the packet and other information) of one packet (188 bytes) is recorded and reproduced.
It comprises a data storage area 11 for recording and reproducing 92 bytes of data from the beginning of one 88-byte packet. Also, the adjacent sync block SB
# N + 1 indicates that the area of the 96-byte data storage area 4 shown in FIG.
Data storage area 1 in which 6-byte data is recorded and reproduced
2.

The DSS system of the second transmission system is one of the U.S. digital broadcasting television standards. The packet size is 130 bytes, and 10 bytes of data (dummy or additional information) is added to the data. The data is transmitted in a byte size (for convenience of explanation, the 140 bytes are also referred to as a packet). At the time of recording the DSS digital signal, in the present embodiment, the sync block shown in FIG. 1 is replaced by SB # n and SB # shown in FIG.
n + 1 and SB # n + 2, and these three sync blocks SB # n and SB # n
Digital signals are repeatedly recorded in units of +1 and SB # n + 2, and reproduced.

Here, in FIG. 3, the sync block S
B # n is the 96-byte data storage area 4 shown in FIG.
Area is one of four bytes of additional information (eg, packet arrival time and other information) for each of two packets (2 × 140 = 280 bytes).
It comprises an additional information storage area 15 in which 4-byte additional information for the second packet is recorded and reproduced, and a data storage area 16 in which 92-byte packet data from the beginning of the first packet are recorded and reproduced.

The adjacent sync block SB # n +
1 indicates that the area of the 96-byte data storage area 4 shown in FIG. 1 is composed of the remaining 38-byte packet data of the first packet of the two packets and the 10-byte data added thereto. Dummy data or additional information)
Are stored in the data storage areas 17 and 18, respectively.
And an additional information storage area 19 for recording and reproducing 4-byte additional information for the second packet, and a data storage area 20 for recording and reproducing 44 bytes of data from the beginning of the second packet. .

Further, in the sync block SB # n + 2, the area of the 96-byte data storage area 4 shown in FIG.
The remaining 86 bytes of packet data of the second packet of the above two packets and 10
Byte data (dummy data or additional information) is composed of data storage areas 21 and 22 in which recording and reproduction are performed, respectively.

As described above, in the present embodiment, at the time of recording a digital signal of the second transmission method (a method having a maximum packet size of 140 bytes), at least a 130-byte packet transmitted out of 140 bytes is shown in FIG. As described above, since the data is recorded left-justified, it can be taken out from the buffer memory continuously with the 4-byte additional information.

The track format includes a recording wavelength, a required recording capacity of main data, a required recording capacity for other information, a lock area of a phase locked loop (PLL circuit),
The determination is made in consideration of the relationship with the margin area for editing and the like. Among these, when determining the required recording capacity of the main data, 6 is a least common multiple of 2 sync blocks which are recording and reproducing units of the first transmission method and 3 sync blocks which are recording and reproducing units of the second transmission method. The condition is that the data block is composed of multiples of the data sync block in units of a sync block.

FIG. 4 shows a track format in this embodiment. As shown in the figure, one track includes a margin area 25, a preamble area 26, a subcode area 27, a postamble area 28, and an IBG area 2.
9, a preamble area 30, a data area 31, an error correction code area 32, a postamble area 33, and a margin area 34.

Here, of the data area 31 and the error correction code area 32 constituting the main data area, the data area 31 in the present embodiment satisfies the above condition.
It is set to 306 sync blocks, which is a multiple of the sync block. The error correction code area 32 is an area where an outer code (C3 code) for error correction is recorded, and is composed of 30 sync blocks.

As a result, since one packet of the digital signal of the first transmission method is recorded in units of two sync blocks, 153 (= 306/2 ×)
1) The packet is recorded and reproduced. In the digital signal of the second transmission method, two packets are recorded in units of three sync blocks.
(= 306/3 × 2) packets are recorded and reproduced.

As described above, according to the present embodiment, the first
In both of the second transmission method and the second transmission method, the data blocks in one track can be used without excess and deficiency, so that the recording efficiency is good. Further, since one packet data does not extend over two tracks, the packet processing is performed. Since the data is completed in the track, the efficiency of use of the buffer memory is good and the addressing is easy.

By the way, as described above, in the configuration of the sync block at the time of recording the digital signal of the first transmission system in FIG. 2, one packet of the first transmission system is recorded in units of two sync blocks. To determine whether the packet division portion recorded in the sync block is the first half or the second half of one packet, the sync block number recorded in the ID portion is, for example, the first half when it is even, and corresponds to the second half when it is odd. Can be identified by

On the other hand, in the structure of the sync block at the time of recording the digital signal of the second transmission system in FIG. 3, two packets of the second transmission system are recorded in units of three sync blocks, so that one sync block is recorded. In order to determine which part of which packet is the packet division part to be performed, the sync block number recorded in the ID part is referred to, and this is divided by “3” to obtain a remainder. If the remainder is "0", it is determined as the first divided part, if the remainder is "1", it is determined as the second, and if the remainder is "2", it is determined as the third divided part.

Further, the position of the sync block in which the packet division part of the second transmission system is located is the first, second, and third sync blocks.
If one sync block is required for other information, the other part cannot be used. That is, information can be recorded only in units of two sync blocks or in units of three sync blocks.

Therefore, in the embodiment described below, a sync block number is recorded in units of division. FIG. 5 is a block diagram showing another embodiment of a sync block when recording a digital signal of the first transmission method. 2, the same components as those in FIG. 2 are denoted by the same reference numerals.

In this embodiment, any two adjacent sync blocks #n and # n + 1 are
As shown in FIG. 5, the 3-byte header area arranged between the 3-byte address information (ID) and its parity shown in FIGS. Byte main header area 41 and 1
It is divided into a byte data spare area 42 and the lower two bits of the first byte of the main header recorded in the main header area 41 are used as a counter of a divided sync block. That is, the value “00” of the lower two bits of the first byte of the main header is set to the first sync block S.
In B # n, “01” is set to the second sync block SB # n + 1.
Assign to

Similarly, FIG. 6 is a block diagram showing another embodiment of a sync block when recording a digital signal of the second transmission system. 3, the same components as those of FIG. 3 are denoted by the same reference numerals. In this embodiment, any three adjacent sync blocks SB # n and SB # n +
1 and the sync block SB # n + 2 respectively store the 3-byte header information arranged between the 3-byte address information (ID) and its parity shown in FIGS. 1 and 3 and the 96-byte data storage area. As shown in FIG. 6, the main header area 51 is divided into a 2-byte main header area 51 and a 1-byte data spare area 52.
The lower two bits of the first byte of the main header recorded in 1 are used as a counter of a sync block obtained by dividing the lower two bits. That is, the lower 2 bytes of the first byte of the main header
The bit value “00” is assigned to the first sync block SB # n.
“01” is set to the second sync block SB # n + 1, and “1”
"0" is assigned to the third sync block SB # n + 2.

As described above, since it is possible to determine what information is contained in the sync block based on the counter value of the sync block, even when recording a digital signal of the second transmission method, the division of the main header can be performed without using a division circuit or the like. The divided part of the packet can be determined by the lower two bits of the first byte. Also, since the counter value of the lower 2 bits of the first byte of the main header can be given independently of the sync block number (ID) with 00 as an initial value, other data can be freely used for any number of sync blocks in between. Can be recorded.

In the present invention, a digital signal can be recorded in the format of the embodiment shown in FIG. 3, the same components as those of FIG. 3 are denoted by the same reference numerals. In this embodiment, any four adjacent sync blocks SB # n, sync block SB # n + 1, sync block SB # n + 2, and sync block SB # n
+3 indicates a 3-byte address area (ID) and its parity as shown in FIG. 6, and a 3-byte header area arranged between a 96-byte data storage area, followed by a 2-byte main header. The area 61 is arranged in the same manner as in FIGS. 5 and 6, except that a 97-byte data storage area is subsequently provided.

That is, in this embodiment, the data storage area of the first sync block SB # n has the data reserve area 62 of 3 bytes, followed by the storage area 63 of the packet 0 of 77 bytes and the start of the packet 1 And a storage area 64 of 17 bytes. Also, the second sync block SB
In the # n + 1 97-byte data storage area 65, the remaining 60 bytes of the packet 1 and the first 37 bytes of the packet 2 are recorded. Further, the third sync block SB # n +
In the second 97-byte data storage area 66, the remaining 40 bytes of the packet 2 and the first 57 bytes of the packet 3 are recorded. Further, the fourth sync block SB # n + 3
In the 97-byte data storage area 67, the remaining 20 bytes of the packet 3 and all 77 bytes of the packet 4 are recorded.

As described above, a 77-byte packet is recorded for every 5 packets in units of 4 sync blocks, and a sync block obtained by dividing the lower 2 bits of the first byte of the main header recorded in the main header area 61 is divided. Used as a counter. That is, the first of the main header
The value of the lower two bits “00” of the byte is set to the first sync block SB # n, and “01” is set to the second sync block SB # n.
+1 to “10” and the third sync block SB # n + 2,
“11” is assigned to the fourth sync block SB # n + 3.

When the packet data of the digital transmission system is selected as the packet data of the first and second transmission systems and recorded and reproduced by one device, the recording and reproduction unit of the first transmission system is used. There are two sync blocks and the second
3 sync blocks, which are recording / reproducing units of the transmission method,
Since the least common multiple R of 4 sync blocks, which is a recording / reproducing unit of the third transmission method, is 12 sync blocks,
The data area per track is composed of, for example, 276 sync blocks which are multiples of R (= 12).

The counter value of the divided sync block is not limited to the first byte of the main header, and the number of bits is not limited to 2 bits but can be increased.

Next, another embodiment of the present invention will be described. In the present embodiment, a digital signal of the first transmission method and / or a digital signal of the second transmission method is recorded by a helical scan type magnetic recording / reproducing apparatus with a number of sync blocks which is a multiple of 6 per track. The point of reproduction is the same as that of the above-described embodiment. However, in this embodiment, when the digital signal of either transmission method is recorded, the video signal and the audio signal are reproduced at the normal speed (the same speed as the recording). At the time of reproduction at two different speeds from that at the time of recording (here, 3
It is characterized in that there are data streams TP1 and TP2 for trick play in two trick plays of double speed playback and 9x speed playback.

Here, the trick play data sequence TP
Reference numeral 1 denotes a data sequence for triple-speed reproduction, which is composed of a data sequence TP1v for a video signal and a data sequence TP1a for an audio signal. The trick play data sequence TP2 is a data sequence for 9 × speed reproduction,
This is a data sequence for a video signal.

FIG. 8 shows a track pattern according to another embodiment of the present invention. As shown by 71-73 and 81-83 in the figure, the data series TP1v and TP1a
Are recorded in each track of track numbers "1", "7" and "13", which are recorded by a rotating head having the same azimuth angle, that is, in a six-track cycle. Further, as indicated by 91 to 94, the data series TP2 is provided for every other track of the track numbers “1”, “3”, “5” and “7” recorded by the rotating head having the same azimuth angle. After the recording, the non-recording is repeated on the following 10 tracks, and the recording is repeated at an 18-track cycle.

As shown in FIG. 8, the data series TP1v, TP1a and TP2 for each trick play can be reliably scanned when the rotary head crosses the track diagonally in each trick play. Will be recorded. In the control track, markers a1 and a2 are recorded at a period of 18 tracks. The solid arrow indicates the scanning locus of the rotating head with a + azimuth angle during 3x or 9x playback, and the broken arrow indicates the scanning locus of the rotating head with a -azimuth angle during 3x or 9x playback. Show.

In this embodiment, the number of data blocks (the number of sync blocks) for each trick play set in one track is set to be a multiple of 6 for each data sequence. That is, the data sequence TP1v has 90 (= 6 × 15) sync blocks, the data sequence TP1a has 6 (= 6 × 1) sync blocks, and the data sequence TP2 has 24 (= 6 × 4) sync blocks. Set to.

The number of bursts reproduced by the rotary head in one rotation of the rotary body to which the rotary head is attached is determined by the head scanning locus during triple speed reproduction indicated by arrow 3x in FIG. As can be seen from the head scanning trajectory at the time of 9 × speed reproduction, the data series TP1v has one burst,
The data series TP1a is also one burst, and the data series T
Since P2 is 4 bursts as can be seen from the head scanning trajectory at the time of 9 × speed reproduction, the number of sync blocks reproduced by the rotary head in one rotation of the rotator is the data series T
P1v is a 90 (= 90 × 1) sync block, data sequence TP1a is a 6 (= 6 × 1) sync block, and data sequence TP2 is a 96 (= 24 × 4) sync block.

In FIG. 8, the track patterns in the trick play frame are all composed of a first track (track number “0” or the like) in which sync blocks for normal reproduction are recorded, and data series TP1v, TP1a and T
The second track (track number "1" or the like) in which P2 is recorded in combination with the sync block for normal reproduction, and the second track in which the data sequence TP2 is recorded in combination with the sync block for normal reproduction. Fourth track (such as track number "13") in which three tracks (such as track number "3") and data series TP1v and TP1a are recorded together with sync blocks for normal reproduction.
Are recorded. The following table summarizes the number of sync blocks for these four types of tracks.

[0054]

[Table 1] As can be seen from Table 1, the number of sync blocks of the data sequence NML for normal reproduction in one track is a multiple of the least common multiple "6", and the data for trick play in one track. The total number of sync blocks of the series TP is also a multiple of the least common multiple “6”.

Therefore, the playback rate of the sync block is
Since the rotating body rotates 30 times per second, the data series TP1
v is 2.42 Mbps (= 90 × 30 × 112 × 8), and the data sequence TP1a is 161 kbps (= 6 × 30 × 112 × 8)
And the data series TP2 is 2.58 Mbps (= 96 × 3
0 × 112 × 8).

In the case of the first transmission method (MPEG2-TP), 94 (= 188/2) bytes are stored per sync block, so that the data sequence TP1v is 2.03 Mbps ( = 90 × 30
× 94 × 8), and the data series TP1a is 135 kbp
s (= 6 × 30 × 94 × 8), and the data series TP2 is 2.
It is 17 Mbps (= 96 × 30 × 94 × 8).

In the case of the second transmission method (a method in which the packet size is 140 bytes at the maximum), since 93.3 (= 140 × 2/3) bytes are stored per sync block, the data sequence TP1v is 2 bytes. .02 Mbps (= 90 × 30
× 93.3 × 8), and the data sequence TP1a is 134 kb.
ps (= 6 × 30 × 93.3 × 8), and the data sequence TP2 is 2.15 Mbps (= 96 × 30 × 93.3 × 8).

On the other hand, the reproduction rate of the sync block of the data sequence NML for normal reproduction recorded in the white portion of each track shown in FIG. 8 is, as shown in FIG. 8, the data sequence TP1v and TP1a per 18 tracks. Since there are three recording portions and one data series TP2 recording portion, 18 × 306− (90 × 3 + 6 × 3 + 96) = 5124 (sync block / 18 tracks) 5124 × (60/18) × 112. × 8 = 15.3 (Mbps). Therefore, the actual packet data reproduction rate during normal reproduction is up to the first transmission method (MPEG2-T).
P), 12.84 Mbps (= 5124 × (60/18) × 94
× 8) and 12.75 Mbps (= 5 in the case of the second transmission method (a method in which the packet size is a maximum of 140 bytes)).
124 x (60/18) x 93.3 x 8).

If one packet spans two trick play frames, the trick play is reproduced in trick play frame units. Therefore, reproduction is performed from the trick play frame in which the latter half of the divided packet is stored. If it is started, the divided packets cannot be reproduced, which is not desirable.
It is not desirable to fill a data block with invalid data in order to avoid packet division, since recording efficiency is reduced.

On the other hand, according to the present embodiment, since the trick play data sequences TP1v, TP1a and TP2 are arranged in one trick play frame (18 tracks) cycle, the packet is completed within the track. And the packet is completed within the trick play frame. Therefore, according to the present embodiment, since one packet data does not extend over two tracks for any data sequence, the packet processing is completed within the track, and the data blocks can be used without excess or shortage. The efficiency is high, the use efficiency of the buffer memory is high, and the addressing is easy.

The present invention is not limited to the above embodiment, and various other modifications are possible.
For example, the data sequence TP1v is composed of 86 sync blocks, T
P1a may be 2 sync blocks and TP2 may be 21 sync blocks. In this case, the total number of sync blocks for trick play in 18 tracks of one trick play frame is “264” for triple-speed playback, and 9 for sync play. The number of sync blocks for normal playback in 18 tracks is "5160", which is a multiple of "6", and the number of sync blocks for normal playback in 18 tracks is "84". .

The data sequence TP1v may be 88 sync blocks, TP1a may be 2 sync blocks, and TP2 may be 24 sync blocks. In this case, the following table summarizes the number of sync blocks for the four types of tracks.

[0063]

[Table 2] As can be seen from Table 2, the number of sync blocks of the data sequence NML for normal reproduction in one track is a multiple of the least common multiple “6”, and the data for trick play in one track. The total number of sync blocks of the series TP is also a multiple of the least common multiple “6”.

Next, an embodiment of a recording apparatus for realizing the method of the present invention will be described with reference to the block diagram of FIG.
In the figure, input packet data is written to a buffer memory 101 for normal data, and is input to a control circuit 102 to read out read signals RTP1v and RTP1.
Various control signals such as 1A, RTP2, RN, and switching signal SW are generated.

The output signal of the control circuit 102 is input to a packet header adding circuit 103, which generates a packet header and outputs the packet header.
1 is input. Normal data buffer memory 10
The packet data and the header written in 1 are read by the read signal RN and input to the trick play data generation circuit 104 and the selection circuit 109. From the trick play data generation circuit 104, the above-described data series TP1v, TP1a and TP2 are taken out in parallel,
Packet header (additional header) addition circuit 1
05, the 4-byte additional information (for example, the arrival time of the packet and other information) is multiplexed as an additional header for each packet, and then written into dedicated buffer memories 106, 107 and 108, respectively.

As a result, the buffer memory 106, 1
When the input packet data is of the first transmission method, the storage data of 07 and 108 is as shown in FIG.
As shown in FIG. 9B, a 4-byte additional information (additional header) is multiplexed at the head of each 188-byte trick play packet. As shown in the figure, the format configuration is such that 4-byte additional information (additional header) is multiplexed at the head of each 140-byte trick play packet.

The data stored in the buffer memories 106, 107 and 108 are read signals RTP1v, RTP
Selection circuit 10 read out by TP1a and RTP2
9 is input. The selection circuit 109 selects one of the above-described normal reproduction packet data and the three types of trick play packet data in packet units based on the switching signal SW, and inputs this to the packet division circuit 110. .

The packet division circuit 110 is a circuit for dividing input packet data into 96-byte units corresponding to a data storage area (4 in FIG. 1) of 96 bytes in one sync block. When inputting packet data of the system, 92 bytes from the beginning of the 188-byte packet data are output following the 4-byte additional information, and thereafter, the remaining 96 bytes of the packet data are repeatedly output.

When packet data of the second transmission method is input, the packet division circuit 110 outputs 4-byte additional information and 96 bytes consisting of 92 bytes from the head of the first packet. Of the remaining 48 bytes and 4 bytes of additional information and 4 bytes from the beginning of the second packet
It repeats outputting 96 bytes of 4 bytes and then outputting the remaining 96 bytes of the second packet.

9 output from the packet division circuit 110
The 6-byte (97-byte in the example of FIG. 7) data is supplied to the header adding circuit 111, and the 3-byte header information from the control circuit 102 is added to the head thereof, and then input to the outer code generation circuit 112. Is done. Here, the above-mentioned 3-byte header information includes a 2-byte main header and a 1-byte main header when performing recording in each of the embodiments shown in FIGS.
It consists of a dummy for a data reserve area of bytes. In the two bytes of the main header, the lower two bits of the first byte contain the counter value indicating the packet order.

The outer code generation circuit 112 calculates 99 (= 96 +
3) An outer code of 30 bytes is generated as an error correction code when data and a header input in byte units are input to 306 sync blocks for one track.

The inner code generation circuit 113 receives the data, the header, and the outer code from the outer code generation circuit 112, and generates an 8-byte parity as an inner code based on these. The output digital signal (data, header, outer code and inner code) of the inner code generation circuit 113 is supplied to the additional circuit 1
After being supplied to the buffer 14 and added with a 2-byte synchronization signal indicated by Sync in FIGS. 1 to 3 and 3-byte address information indicated by ID, the area 26 shown in FIG. 27, 28, 30, 33 and the like are multiplexed, further modulated and amplified, and then recorded on a recording medium (here, a magnetic recording medium) by a recording mechanism using a known rotating head (not shown). Tape) 116.

In this embodiment, when recording a digital signal of any one of the first and second digital signal transmission systems, packets are allocated to the track without excess or deficiency and recorded. The signal buffer memories 101, 106 to 108 have good use efficiency and are easy to address.

Next, the configuration and operation of a reproducing apparatus for realizing the reproducing method of the present invention will be described with reference to the block diagram of FIG. In the figure, the digital signal recorded on the recording medium 116 is reproduced by a known reproducing mechanism (here, a mechanism including a rotary head), and then the signal reproducing circuit 201,
The data is supplied to a control circuit 204 and a data distribution circuit 205 through an ID detection circuit 202 and an error correction circuit 203, respectively.

The control circuit 204 analyzes the header (or main header) of the reproduced digital signal, generates a control signal for the data distribution circuit 205, and writes control signals WTP1v and WTP for the buffer memories 206 to 209.
1a, WTP2 and WN are generated, and the 4-byte additional information (additional header) in the reproduced digital signal is analyzed, the read control signal R is read so as to refer to the packet arrival time and read the packet at the same timing.
Generate TP1v, RTP1a, RTP2 and RN.

When the input reproduction digital signal is the data sequence TP1v, TP1a and TP2 for trick play based on the control signal, the data distribution circuit 205 distributes and inputs the data to the buffer memories 206, 207 and 208, respectively. In the case of packet data, it is input to the buffer memory 209.

Here, the recording medium 116 of the present embodiment
As described above, when recording digital signals of any of the two types of digital signal transmission systems as described above, packets are allocated to the tracks without excess or deficiency and are recorded. 206-209 are used efficiently and addressing is easy. The packet data stored in the buffer memories 206 to 209 is a read control signal R from the control circuit 204.
It is read based on TP1v, RTP1a, RTP2 and RN.

The present invention is not limited to the above embodiment, and the present invention can be similarly applied to three or more types of transmission systems having different packet sizes. That is, in this case, a predetermined number of packets are recorded so as to be stored in a predetermined number of data blocks together with additional information, and the number of data blocks on one track is determined by the data of each recording / reproduction unit of a plurality of transmission methods. The number may be set to a multiple of the least common multiple R of the number of blocks.

In the above embodiment, the digital signal is recorded and reproduced on the magnetic tape.
The present invention can also be applied to a method of forming a track composed of a plurality of sectors on a disk-shaped recording medium such as a magnetic disk or an optical disk and performing recording and reproduction. In this case, the number of sectors on one track is determined by a plurality of sectors. It may be set to a multiple of the least common multiple R of the number of data blocks of each recording / reproduction unit of the transmission method.

[0080]

As described above, according to the first and second aspects of the present invention, when recording a digital signal of any one of the two types of digital signal transmission systems, packets are transferred to the track. Since allocation can be performed without shortage, the use efficiency of the recording medium can be improved, and the packet processing is completed within the track, so that the use efficiency of the recording / reproducing buffer memory is good and the addressing can be easily performed.

[0081]

According to the third and fourth aspects of the present invention, a normal reproduction data sequence and n types of trick play data sequences are recorded in a mixed manner, and when these are reproduced, at least a T track cycle is required. Since the packet to be recorded and reproduced in the memory can be completed, the efficiency of use of the recording medium can be improved for the trick play data sequence, and the efficiency of use of the buffer memory for recording and reproduction can be improved, and the addressing can be facilitated. .

According to the fifth and sixth aspects of the present invention, the total number of data blocks of the normal reproduction data sequence in any one of the T tracks is set to a multiple of the least common multiple R. By recording and playing back, even if a trick play data sequence exists, the packet of the normal play data sequence is completed within the track and does not span between tracks. In this case, the use efficiency of the recording medium can be improved, the use efficiency of the buffer memory for recording and reproduction can be improved, and the addressing can be facilitated.

According to the seventh and eighth aspects of the present invention, the total number of data blocks of the data sequence for normal reproduction in each track is set to a multiple of the least common multiple R and recorded.
Also, by setting the total number of data blocks of the trick play data sequence for each type in each track to be a multiple of the least common multiple R and recording the data, the packets of all data sequences are completed within the track. As a result, the buffer memory can be used efficiently for any data sequence, and addressing can be easily performed. One recording / reproducing device can optimally record digital signals of any of the N types of digital signal transmission systems with good recording efficiency. Can be recorded and played back.

[0085]

[0086]

[Brief description of the drawings]

FIG. 1 is a format diagram of an embodiment of a sync block recorded and reproduced according to the present invention.

FIG. 2 is a diagram showing a configuration of a sync block when recording a digital signal of a first transmission method.

FIG. 3 is a diagram illustrating a configuration of a sync block when recording a digital signal of a second transmission method.

FIG. 4 is a diagram showing a track format according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration of a sync block according to another embodiment at the time of recording a digital signal of the first transmission method.

FIG. 6 is a diagram illustrating a configuration of a sync block according to another embodiment at the time of recording a digital signal of a second transmission method.

FIG. 7 is a diagram illustrating a configuration of a sync block according to still another embodiment when recording a digital signal.

FIG. 8 is a diagram for explaining a track pattern and a head scanning trajectory during trick play according to another embodiment of the present invention.

FIG. 9 is a block diagram of an embodiment of a recording apparatus for realizing the method of the present invention.

FIG. 10 is a block diagram of an embodiment of a reproducing apparatus for realizing the method of the present invention.

[Explanation of symbols]

1 Synchronous signal (Sync) area 2 Address information (ID) area 3 Header storage area 4 Data storage area 5 Parity area 10, 15, 19 Additional information storage area 11, 12, 16, 17, 18, 20, 21, 22 Data Storage area 27 Subcode area 31 Data area 32 Error correction code area 41, 51, 61 Main header area 71-73 Trick play video signal data sequence TP
1v recording portion 81-83 Trick play audio signal data sequence TP
1a recording portion 91-94 Video signal data sequence TP for trick play
2 Recorded portion 101 Normal data buffer memory (addition and storage means) 102 Control circuit (additional information generation means and addition means) 103 Packet header addition circuit (addition and storage means) 104 Trick play data generation circuit 106 to 108 Trick play Data buffer memory (addition and storage means) 109 selection circuit 110 packet division circuit (division means) 111 header addition circuit (addition means) 115 signal recording circuit (signal recording circuit) 116 recording medium 204 control circuit (control means) 205 data Distribution circuit 206-208 Trick play data buffer memory (buffer memory) 209 Normal buffer memory (buffer memory) 210 Packet selection circuit (control means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-215013 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/10 G11B 27/00 H04N 5 / 783 H04N 5/92

Claims (10)

(57) [Claims] 1. A digital signal having a first packet size.
Or a second digital signal transmission system for transmitting
A second digital signal transmitting a packet size digital signal.
Digital signal of the digital signal transmission system to a recording medium.
Recording while forming racks sequentially, and
Digital signal recording for reproducing the digital signal from the
Recording and reproducing method, wherein the first and second packet sizes are
Using a plurality of different data blocks,
Record digital signal of first or second packet size
The digital signal of the first packet size
At the time of recording, one packet contains two data with additional information.
Stored in a block and the digit of the second packet size.
When recording the total signal, two packets and three additional information
And the first digital signal
Transmission method and the second digital signal transmission method
When recording digital signals of these formats,
Is the packet storage unit in each of
Number of natural number times 6 which is the least common multiple of data block number
Data block is recorded on one track of the recording medium.
Digital signal recording and reproducing method is characterized in that so as to record. 2. The two or three data blocks
This data block is assigned to each data block
A code indicating the order in the disk unit is added and recorded.
When the digital signal is reproduced, the code is reproduced.
Each data block in the data block unit.
2. The digital signal recording / reproducing method according to claim 1 , wherein the order of the signals is identified . 3. N types having different packet sizes from each other
(N is a natural number of 2 or more)
Any k-th (k = 1 to N) digital signal transmission method
During recording of the formula of a digital signal, p _k-number of the number of packets
_{D k} pieces of digital signals together with additional information _(p k, _{d k}
Is a natural number)
Tracks are sequentially formed and recorded, and one track is recorded.
Each of the N digital signal transmission systems
Of the least common multiple R of the data block recording unit of the digital signal
When recording multiple data blocks, the digital signal is a mixture of a normal reproduction data sequence reproduced at the same speed as during recording and n types of trick play data sequences reproduced at a different speed than during recording. A digital signal recording / reproducing method for recording and reproducing the data blocks in multiples of the least common multiple R per track, wherein the n types of trick play data sequences are predetermined and unique. At the track period, the data is arranged and recorded at a specific fixed position in the track, and the total number of data blocks of the normal reproduction data series within the track number of the least common multiple T of each track cycle is a multiple of the least common multiple R. And the total number of data blocks of the trick play data sequence for each type within the number of tracks of the least common multiple T The least common multiple recording is set to a multiple of R, respectively, daisy <br/> Tal signal recording and reproducing method characterized by playing it. 4. The trick play data sequence within a track number of the least common multiple T, wherein the total number of data blocks of the normal reproduction data sequence within the track number of the least common multiple T is a multiple of six. The total number of data blocks is set to a multiple of 6 for each type and recorded.
4. The digital signal recording / reproducing method according to claim 3 , wherein the digital signal is reproduced. 5. The total number of data blocks of the normal reproduction data sequence in an arbitrary track within the number of tracks of the least common multiple T is set and recorded as a multiple of the least common multiple R. The digital signal recording / reproducing method according to claim 3 , wherein the digital signal is reproduced. 6. The method according to claim 1, wherein the total number of data blocks of said normal reproduction data sequence in said one arbitrary track within said track number of said least common multiple T is set to a multiple of 6, and recorded.
6. The digital signal recording / reproducing method according to claim 5 , wherein the digital signal is reproduced. 7. N types having mutually different packet sizes.
(N is a natural number of 2 or more)
Any k-th (k = 1 to N) digital signal transmission method
During recording of the formula of a digital signal, p _k-number of the number of packets
_{D k} pieces of digital signals together with additional information _(p k, _{d k}
Is a natural number)
Tracks are sequentially formed and recorded, and one track is recorded.
Each of the N digital signal transmission systems
Of the least common multiple R of the data block recording unit of the digital signal
When recording multiple data blocks, the digital signal is a mixture of a normal reproduction data sequence reproduced at the same speed as during recording and n types of trick play data sequences reproduced at a different speed than during recording. A digital signal recording / reproducing method for recording and reproducing the data blocks in multiples of the least common multiple R per track, wherein the n types of trick play data sequences are predetermined and unique. At the track cycle, the data is arranged and recorded at a specific fixed position in the track, and the total number of data blocks of the data sequence for normal reproduction in each track is set to a multiple of the least common multiple R and recorded. The total number of data blocks of the trick play data series for each type is set to a multiple of the least common multiple R and recorded. And, wherein the Surude to play this
I di Tal signal recording and reproducing method. 8. The total number of data blocks of the data sequence for normal reproduction in each track is a multiple of 6, and
9. The method according to claim 8, wherein the total number of data blocks of the trick play data sequence in each track is set to a multiple of 6 for each type, recorded, and reproduced.
8. The digital signal recording / reproducing method according to 7 . 9. Packet data of an arbitrary type of digital signal transmission system among N types (N is a natural number of 2 or more) of digital signal transmission systems having mutually different packet sizes is inputted, and additional information corresponding to the packet data is received. Additional information generating means for generating the additional packet information; adding and storing means for temporarily adding the additional information generated by the additional information generating means to the input packet data; and storing the packet input from the adding and storing means. According to the digital signal transmission method of the data, the packet data of the number of p _k packets are added together with the additional information to the d _k (p
_k and d _k are each a natural number) and a dividing unit that divides the packet data and the additional information extracted from the dividing unit into header information and an error correction code at least in data block units. The digital signal extracted from the adding means is sequentially recorded on a recording medium by forming tracks, and the least common multiple of the data block recording unit of each digital signal of the N kinds of digital signal transmission systems per track is recorded. Recording means for recording a data block of a multiple of R; a buffer memory for reproducing the digital signal from the recording medium and temporarily storing the reproduced packet data; and additional information and header information in the reproduced digital signal. Control the writing and reading of the buffer memory based on the Digital signal recording and reproducing apparatus characterized by a control means for outputting the packet. 10. The packet data of the d _k data blocks extracted from the dividing means as the header information, and a counter value indicating an order of the p _k packets, and the additional information. was added to each of the control means is possible to output the p _k pieces of order identification to the control the writing and reading of the buffer memory reproduction packets of a packet based on said counter value in said header information 10. The digital signal recording / reproducing apparatus according to claim 9, wherein: