JP2000243027A - Digital signal recorder and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the proper use of a tape-like recording medium and a disk- like recording medium easily at need. SOLUTION: An input digital signal is constituted so as recordable in parallel to a magnetic tape 100 and a magnetic disk 200. The input digital signal is encoded for error correction by taking data in the amount of 6 tracks as a recording unit and recorded on the magnetic tape 100 while being assigned with an absolute track number ATN for discriminating a track on the magnetic tape. Also the input digital signal is subjected to file form conversion suitable for recording on the magnetic disk 200 by being united with the address information corresponding to the absolute track number ATN then recorded on the magnetic disk 200 at the same recording unit as the recording unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal recording apparatus for recording digital signals on a tape recording medium and a disk recording medium, and a tape recording medium and a disk recording medium on which digital signals are recorded. The present invention relates to a reproducing device for reproducing.

[0002]

2. Description of the Related Art For example, an MPE such as a VTR (Video Tape Recorder) conforming to the D-VHS (registered trademark) standard
2. Description of the Related Art A digital signal recording / reproducing apparatus which records and reproduces a digital signal such as a G (Motion Picture Expert Group) transport stream on a magnetic tape as a tape-shaped recording medium has been conventionally known.

On the other hand, a digital signal recording / reproducing apparatus for recording and reproducing digital signals on a magnetic disk or an optical disk which is a disk-shaped recording medium is also known.

Japanese Patent Publication No. Hei 7-31905 discloses that a tape-shaped recording medium and a disk-shaped recording medium are used in combination, and the disk-shaped recording medium includes a first part of image information recorded on the tape-shaped recording medium. For a few minutes,
When accessing a certain unit portion of the tape-shaped recording medium, while accessing the corresponding portion of the disk-shaped recording medium, access to the corresponding portion of the tape-shaped recording medium,
Conventionally, an access method has been proposed in which reproduction of a disk-shaped recording medium is stopped when reproduction of a corresponding portion becomes possible, and reproduction of a tape-shaped recording medium is started.

[0005]

The tape-shaped recording medium is
It has the advantage of large capacity and low cost per unit information amount, but has the disadvantage of long access time to the desired information recording portion. On the other hand, the disk-shaped recording medium is superior to the tape-shaped recording medium in that the access time is short,
Recording capacity and economy are inferior to tape-shaped recording media. Therefore, a system that can use the advantages of both as needed is desired.

The method disclosed in Japanese Patent Publication No. Hei 7-31905 makes use of the short access time of a disk-shaped recording medium to compensate for the disadvantage of a tape-shaped recording medium having a long access time. However, when switching from the reproduction of the disk-shaped recording medium to the reproduction to the tape-shaped recording medium, the reproduction of the disk-shaped recording medium is first stopped, and then the reproduction of the tape-shaped recording medium is started. There is a disadvantage that the image is temporarily interrupted.

The present invention has been made in view of the above points, and provides a digital signal recording apparatus and a reproducing apparatus which can easily use a tape-shaped recording medium and a disk-shaped recording medium as necessary. It is a second object of the present invention to provide a digital signal reproducing apparatus capable of smoothly switching between a reproduction signal from a tape recording medium and a reproduction signal from a disk recording medium. The purpose of.

[0008]

According to a first aspect of the present invention, there is provided a digital signal recording apparatus for recording an input digital signal on a tape recording medium and a disk recording medium. An absolute track number generating means for generating an absolute track number for identifying a track formed on a medium; and adding the absolute track number to the input digital signal, and using a signal recorded on a predetermined number of tracks as a recording unit. Tape recording means for recording on the tape-shaped recording medium; and address information corresponding to the absolute track number added to the input digital signal, wherein the disc-shaped recording medium is recorded in the same recording unit as that of the tape-shaped recording medium. And a disk recording means for recording the information on the disc.

It is preferable that the disc recording means records a part of a signal recorded on the tape-shaped recording medium on the disc recording medium. It is preferable that the recording unit is a unit for performing an error correction process.
Preferably, the absolute track number is determined according to a track pitch on the tape-shaped recording medium.

According to a second aspect of the present invention, there is provided a digital signal reproducing apparatus for reproducing a digital signal from a tape-shaped recording medium on which a digital signal is recorded and a disk-shaped recording medium, wherein a track recorded on the tape-shaped recording medium is provided. An absolute track number reading means for reading an absolute track number for identifying an address, an address information reading means for reading address information corresponding to the absolute track number recorded on the disk-shaped recording medium, and the address information. Synchronizing the absolute track number with the absolute track number read from the tape-shaped recording medium, and synchronizing and reproducing means for reproducing digital signals recorded on the tape-shaped recording medium and the disk-shaped recording medium. I do.

It is preferable that the synchronous reproducing means has a control signal reproducing means for reproducing a control signal recorded in a longitudinal direction of the tape-shaped recording medium, and it is preferable to synchronize using the reproduced control signal. The synchronous reproducing means has a bank switching memory, and when the difference value between the absolute track number obtained from the address information and the absolute track number read from the tape-shaped recording medium is equal to or smaller than a predetermined value, the bank switching memory is provided. It is desirable to achieve synchronization by changing the read address of the memory. When switching between the playback signal from the tape-shaped recording medium and the playback signal from the disc-shaped recording medium after synchronization is achieved by the synchronous playback means, it is desirable to switch at the boundary of the recording units.

According to a third aspect of the present invention, there is provided a digital signal recording and reproducing apparatus for recording an input digital signal on a tape recording medium and a disk recording medium and reproducing the recorded digital signal. An absolute track number generating means for generating an absolute track number for identifying a track formed on the input digital signal; and adding the absolute track number to the input digital signal, wherein a signal recorded on a predetermined number of tracks is used as a recording unit. Tape recording means for recording on a tape-shaped recording medium, and adding address information corresponding to the absolute track number to the input digital signal, and recording the same digital recording unit as the tape-shaped recording medium on the disc-shaped recording medium. Disk recording means for recording, and the absolute disk recorded on the tape-shaped recording medium. An absolute track number reading means for reading a track number, address information reading means for reading address information corresponding to the absolute track number recorded on the disk-shaped recording medium, an absolute track number obtained from the address information, A synchronous reproducing unit for reproducing digital signals recorded on the tape-shaped recording medium and the disk-shaped recording medium by synchronizing with an absolute track number read from the tape-shaped recording medium.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing a configuration of a main part of a recording system of a digital signal recording / reproducing apparatus according to a first embodiment of the present invention, and FIG. 2 is a main part of a reproducing system of the same apparatus. FIG. 3 is a block diagram showing the configuration of FIG. This apparatus records digital signals on a magnetic tape 100 as a tape-shaped recording medium and a magnetic disk 200 as a disk-shaped recording medium, and reproduces digital signals from these media.

The recording system shown in FIG. 1 includes a data IF encoding unit 11 for adding information for restoring a digital signal recorded at the time of reproduction as necessary, and a magnetic tape 100.
A six-track memory unit 12 for storing data for six tracks as a recording unit for recording a digital signal, an error correction encoding unit 13 for performing error correction encoding, and ID information as a sync pattern and control information. And a track format encoding unit 14 for forming a recording signal so as to form a predetermined track on a magnetic tape, modulating the recording signal, and the like, a rotating drum, a magnetic head, and a recording block. A tape recording / reproducing unit 15 configured of an amplifier, a reproducing amplifier, etc., for recording a signal on the magnetic tape 100 and reproducing a signal from the magnetic tape 100, and a data amount of a signal output from the data IF encoding unit 11, Sync blocks that are counted by converting to the number of sync blocks configured by the track format encoding unit 14 A disk counter 21, a file format unit 22 that constitutes a file serving as a unit for reading data from the 6-track memory unit 12 and recording the data on the disk 200, a magnetic head, a recording amplifier, a reproduction amplifier, and the like. Recording / reproducing unit 2 for recording data and reproducing signals from the disk 200
3 is provided.

The data for six tracks stored in the six-track memory unit 12 is a unit of error correction coding and decoding,
That is, the data is a unit of error correction, and is referred to as a recording unit in this specification. In this embodiment, since one recording unit corresponds to a recording time of 0.1 second, the 10-Hz reference signal REF10 is transmitted to the six-track memory unit 12, the error correction encoding unit 13, and the track format encoding unit 1
4, supplied to the sync block counter 21 and the file format unit 22.

FIG. 3 is a view showing a recording pattern on the magnetic tape 100. An arrow (a line with an arrow) TR indicates a running direction of the magnetic tape 100, and an arrow HT indicates a scanning direction of the magnetic head. Is shown. Six tracks surrounded by a thick line are the recording units, and a control (CTL) as a reference for tracking during reproduction is provided below the magnetic tape 100.
The signal is recorded parallel to the running direction (longitudinal direction) of the magnetic tape.

Returning to FIG. 1, the track format encoding unit 14 performs a process of writing the absolute track number ATN defined by the following equation (1) into the ID information shown in FIG. ATN = int (nxTP / 14.5) (1) where TP is the track pitch (μ) on the magnetic tape.
m) and n are integers equal to or greater than 0, and int is an operator for extracting the integer part of the value in parentheses. For example, if TP = 29 μm, the absolute track number ATN is defined to increase by two counts for each track. The position of ATN = 0 is a position within 30 seconds from the start end of the magnetic tape.

In FIG. 4, ID0 and ID1 are the first and second bytes of the ID information (3 bytes), and the sync block number (SB #) is the sync block number of the sync block located at the start end of the track. Is a number assigned to each sync block so as to increase by “1” toward the end of the track, with “0” as the number. The absolute track number ATN is such that the sync block number is an integral multiple of “4” +1 (4n + 1), and an integral multiple of “4” +2 (4n +
2) and an integer multiple of “4” +3 (4n + 3) are written to the first byte ID0 of the sync block. SB # = 4
The SF information written to the first byte ID0 of the (n + 1) th sync block is information indicating whether or not the absolute track number ATN is supported. The SF information is 11B (B is added to indicate that B is a binary number). ) Indicates that it supports the absolute track number ATN. The sync block number is the bit b3 of the second byte ID1.
To b0.

As described above, the input digital signal is 6
The data for the track is error-correction-coded using the recording unit as a recording unit, stored in the sync block, and the absolute track number ATN is written in the ID information in the sync block, and is recorded on the magnetic tape 100.

Returning to FIG. 1, the file format unit 22
Performs a process of reading data stored in the six-track memory unit 12 and converting it into a file to be recorded on the disk 200 (hereinafter, referred to as a “disk recording file”). FIG. 5 is a diagram showing an example of the format of a disk recording file generated by the file format section 22. This file has file information (N bytes (for example, 3 bytes)) and an absolute track number ATN (4 bytes). And the number of valid sync blocks RECSB (2 bytes) in the 6-track memory unit 12 and valid data SBDATA (99 bytes) stored in one sync block. Here, the absolute track number ATNd written to the disk recording file (hereinafter referred to as “disk absolute track number ATNd”) is the absolute track number ATN of the track on which data in the 6-track memory is recorded first, and Number ATN
The data from d to the valid data SBDATA immediately before the next absolute track number ATNd corresponds to a recording unit on the magnetic tape, that is, data for six tracks. The valid data SBDATA is net data excluding a sync pattern and ID information included in the sync block.

The disk absolute track number ATNd may be the same as the absolute track number ATN recorded on the magnetic tape, but the absolute track number A divisible by 6
If control is performed so that the first data of the 6-track memory unit 12 is recorded on the TN track, a value obtained by dividing by 6 may be used as the disk absolute track number ATNd. The disk absolute track number ATNd corresponds to the address information described in the claims. If the disk absolute track number ATNd is not the same as the absolute track number ATN at the time of recording, the processing reverse to the processing at the time of recording (for example, When the process of dividing the track number ATN by 6 is performed, the process of multiplying by 6 is performed.

The file format section 22 controls the number of tracks stored in the file until the file size reaches a certain number of bytes, or the number of tracks stored in the file is an integral multiple of the number of tracks (recording unit (6 tracks), for example, 12 tracks). ) Is set as one file, and disk recording files are sequentially constructed and output. The disk recording file output from the file format unit 22 is supplied to a disk recording / reproducing unit 23, and the disk recording / reproducing unit 23
Record at 00.

As described above, in the present embodiment, the absolute track number ATN at which the sync block is recorded is written and recorded in the sync block recorded on the magnetic tape 100, and the data recorded on the magnetic disk 200 is also magnetically recorded. Recording is performed with the disk absolute track number ATNd corresponding to the absolute track number ATN on the tape, and the recording unit of the magnetic tape 100 and the magnetic disk 20
0, the input digital signal is converted to the magnetic tape 100 and the magnetic disk 20.
0 can be easily recorded by associating the recording data with the recording data. Therefore, if necessary, the magnetic tape 100
And the magnetic disk 200 can be easily used properly, and at the time of reproduction, the reproduced data from the magnetic tape 100 and the reproduced data from the magnetic disk 200 can be easily synchronized. For example, if a short program requires a high-speed search, the magnetic disk 2
For example, if the program is a program for a long time, the recording medium can be easily used, such as using the magnetic tape 100.

Next, the reproducing system will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of a main part of a reproducing system in the recording / reproducing apparatus according to the present embodiment. A track format decoding unit 32 for extracting control information such as ID information including an absolute track number ATN and an error correction decoding unit 33 for performing error correction decoding
A switch circuit 34, a 6-track memory unit 35 for storing data for 6 tracks as a recording unit, a data IF decoding unit 36 for returning to the same form as the input digital signal input at the time of recording and ending, It has a disk recording / reproducing section 23 and a file decoding section 41 for returning a reproduced file to original data. The track format decoding unit 32, the error correction decoding unit 33, the six track memory unit 35 and the file decoding unit 41
A Hertz reference signal REF10 is provided.

First, the operation in the magnetic tape reproducing mode in which the switch circuit 34 is connected to the terminal a will be described. In the track format decoding unit 32, data (main unit) is converted from a signal reproduced from the magnetic tape 100.
And the error correction code are extracted, and the error correction
The data is subjected to error correction decoding processing by an error correction decoding unit 33, and the processed data is written to a 6-track memory unit 35 via a switch circuit 34. Data I
The F-decoder 36 sequentially reads data from the six-track memory unit 35 based on the reference signal REF10, performs processing to restore the same form as the digital signal input at the time of recording, and outputs the processed digital signal.

When the switch circuit 34 is in the magnetic disk reproducing mode connected to the terminal b, the disk 2
The disc recording file reproduced from 00 is returned to the original data sequence by the file decoding unit 41, that is, the data sequence stored in the 6-track memory unit 12 at the time of recording, and is returned to the 6-track memory unit 35 via the switch 34. Is stored. More specifically, when the reference signal REF10 is input, the SBDATA corresponding to the recording unit is output to the six-track memory unit 35 until the next reference signal REF10 is input. The file decoding unit 41
By referring to the number of valid sync blocks SBREC corresponding to the data amount of the track, valid data of six tracks, that is, valid data to be output to the six-track memory unit 35 in synchronization with the reference signal REF10 is accurately recognized. be able to. By repeating this operation, the magnetic disk 20 input to the terminal b of the switch circuit 34
0 from the magnetic tape 1 input to the terminal a.
00 and the same format as the reproduced signal from the magnetic tape 1
It is possible to easily switch and output the reproduction signal from 00 and the reproduction signal from the magnetic disk 200.

FIG. 6 is a block diagram showing an addition of a configuration for synchronizing the reproduced data from the magnetic tape 100 and the reproduced data from the magnetic disk 200 to the configuration shown in FIG. 51, a servo unit 52,
A tape drum drive system 53 is additionally shown. Although the servo section 52 and the tape drum drive system 53 are provided regardless of whether or not to synchronize the reproduction data, they are not shown in FIG. 1 or 2.
In FIG. 6, the absolute track number ATN reproduced from the magnetic tape 100 output from the track format decoding unit 32 is "AT" to indicate that it is the absolute track number ATN reproduced from the magnetic tape.
Nt ”. The ATN comparison control unit 51 calculates the difference value δ = ATNd−ATNt, and supplies the difference value δ to the file decoding unit 41 and the servo unit 52,
The control signal SW of the switch circuit 34 is changed in the state of δ = 0 to perform the switching control of the switch circuit 34.

First, a description will be given of a case where the data is switched to the data reproduced from the magnetic disk 200 during the data reproduction from the magnetic tape 100 (while the switch circuit 34 is connected to the terminal a as shown). The track format decoding unit 32 and the file decoding unit 41
The absolute track number ATNt and the disk absolute track number ATNd are input to the ATN comparison control unit 51, respectively. Note that the absolute track number ATNt is added with an offset value corresponding to the time required for error correction decoding processing and the like. When ATNt = ATNd, the same data is input to the terminals a and b of the switch circuit 34. It is configured to: For example, one time is required until the reproduction data from the magnetic tape 100 is output to the six-track memory unit 35.
When the processing time for 0 track is required, the absolute track number ATNt is obtained by subtracting 10 from the reproduced absolute track number ATN.

1) If the difference value δ = 0, since the data input to the terminals a and b of the switch circuit 34 are the same, the ATN comparison control unit 51 sets the switch 34 in synchronization with the reference signal REF10. Is output. 2) If δ> 0, the disk corresponding to the absolute track number ATNt is added to the previously recorded data or the data stored in the previously recorded file in the same file as the output data file. Since the data of the absolute track number ATNd exists, the file decoding unit 41 searches for the data of the appropriate disk absolute track number ATNd according to δ, and starts outputting again from the data. 3) When δ <0, the absolute value of the disc corresponding to the absolute track number ATNt is added to the data recorded later in the same file as the file of the output data or the data stored in the file recorded later. Since the data of the track number ATNd exists, the file decoding unit 41 searches for the data of the appropriate disk absolute track number ATNd according to δ, and starts outputting again from the data.

In cases 2) and 3) above, δ can be corrected by one correction.
If = 0, the same process is repeated, and the switch circuit 34 is switched in synchronization with the reference signal REF10 when δ = 0. As a result, it is possible to switch from the reproduction data from the magnetic tape 100 to the reproduction data on the magnetic disk 200 without missing or duplicating data. After switching the switch circuit 34, the magnetic tape 1
00 may be stopped.

Next, a description will be given of a case in which the data is switched to the data reproduced from the magnetic tape 100 during the reproduction of the data from the magnetic disk 200 (while the switch circuit 34 is connected to the terminal b). 1) When δ = 0, it is the same as 1) above. 2) If δ> 0, that is, if the magnetic tape 100 has not reached the position where it should be reproduced, the servo unit 5
2 fast-forwards the magnetic tape 100 at a tape feed speed higher than usual according to the difference value δ, and moves the reproduction position so that δ = 0. More specifically, for example, if the track pitch TP is 29 (μm), the absolute track number ATNt changes by “2” for each track (see the above formula (1)), while the absolute track number ATNt changes at the bottom of the magnetic tape 100. Since the CTL signal to be recorded is recorded at a rate of one pulse per two tracks as shown in FIG. 3, δ = 4 corresponds to a shift of one pulse of the CTL signal. Therefore, δ of the CTL signal
If the magnetic tape 100 is fast-forwarded by / 4 pulse, A
It is expected that TNt = ATNd. However, since the reproduction from the magnetic disk 200 proceeds even during the fast forward, the disk absolute track number ATNd is always updated. However, by repeating the above operation, the reproduction position of the magnetic tape 100 is moved to the synchronous position. Can be
Finally, δ = 0 can be set. In this state, the switch circuit 34 may be switched from the terminal b to the terminal a in synchronization with the reference signal REF10. 3) When δ <0, that is, when the magnetic tape 100 has passed the position to be originally reproduced, the servo unit 52
Rewinds the magnetic tape 100 at a tape feed speed higher than usual according to the difference value δ, and moves the reproduction position so that δ = 0. The specific method is the same as the above 2).

By the above processing, the reproduction data from the magnetic disk 200 to the reproduction data on the magnetic tape 100
Switching can be performed without data omission or duplication. After switching the switch circuit 34, the magnetic disk 200
May be stopped.

As described above, according to the present embodiment, the switching is performed after the reproduction data from the magnetic tape 100 and the reproduction data from the magnetic disk 200 are synchronized with each other. There is no overlap and smooth switching is possible. Further, by performing the switching in synchronization with the reference signal REF10, that is, at the boundary of the recording unit, the error correction decoding processing can be accurately performed.

(Modification) FIG. 7 is a diagram for explaining a modification of the present embodiment. The reproduction system shown in FIG.
A bank memory 37 and a bank decoder 38, which are bank switching memories used by switching a plurality of banks, are added. In this modification, data reproduced from the magnetic tape 100 is stored in the bank memory 37,
When switching from the reproduction of the magnetic disk 200 to the reproduction of the magnetic tape 100, if the difference value δ is not “0”, the reproduction position of the magnetic tape 100 is not corrected within the range stored in the bank memory 37 without synchronization. This enables switching.

Here, the bank memory 38 is used by switching among ten banks from the first bank to the tenth bank, and each bank has an absolute track number ATNt = ATNt0-5, ATNt0-4, ATNt0-4, …, A
TNt0, ATNt0 + 1,..., ATNt0 + 4 are stored. ATNt0
Is the absolute track number of the data being read at that time, and the absolute track number of the track immediately before the track being reproduced at the time of ATNt0 + 4 pixels. Therefore, ATNt0 + 5 corresponds to the absolute track number of the track currently being reproduced.

The bank decoder 38 determines a bank to be read out so that δ = 0 according to the difference value δ, and reads the data from the bank sequentially from the bank memory 3.
7 is controlled. Thus, in the range of −5 ≦ δ ≦ 5,
Synchronization can be achieved without correcting the reproduction position of the magnetic tape 100, and it is possible to quickly switch from reproduction of the magnetic disk 200 to reproduction of the magnetic tape 100. In the range of | δ |> 5, the servo section 52 needs to correct the reproduction position.

(Second Embodiment) This embodiment corresponds to a case where an input digital signal is an MPEG2 transport stream, and a time stamp is added so that the arrival time interval of a packet to be recorded can be reproduced. And reproduces a reproduction signal by referring to the time stamp at the time of reproduction.

FIG. 8 is a diagram for explaining the configuration of the recording system according to the present embodiment.
Time stamp adding unit 1 between track memory unit 12
6 are provided, and the time stamp generation units 17 and 1
A ３ frequency divider 18 is provided. The time stamp generator 17 is supplied with a 27 MHz reference signal REF27M, and the time stamp generator 17
A time stamp reset by the reference signal REF10 is generated based on F27M, and the time stamp adding unit 1
6 The time stamp adding unit 16 stores the data I
A time stamp is added to the output data of the F encoder 11 and input to the 6-track memory unit 12. Further, the time stamp generation unit 17 divides the frequency of the reference signal REF27M to generate a 30 Hz reference signal REF30.
8 and the servo unit 52. The 1/3 frequency divider 18
The reference signal REF30 is frequency-divided by １ ／ to generate a 10 Hz reference signal REF10, which is supplied to each unit. The output of the 6-track memory 12 is connected to a track format encoding unit 14 and a file format unit 22, and the configuration other than that shown in FIG. 8 is the same as that of FIG.

The sync block constituted by the track format encoder 14 is configured such that 188 bytes (92 bytes + 96 bytes) of MPEG2 transport packets are stored in two consecutive sync blocks as shown in FIG. It is defined, and the time stamp is stored and recorded in the packet header. More specifically, a 22-bit time stamp is stored using 2 bytes of a 4-byte packet header as shown in FIG.

FIG. 9 is a diagram for explaining the configuration of the reproducing system according to the present embodiment. The time stamp comparing section 37, the time stamp counter 38, and the 1/3 frequency divider 39 are provided. . The time stamp counter 38 generates a reference time stamp based on the reference signal REF27M, and supplies the reference time stamp to the time stamp comparison unit 37. The time stamp comparing unit 37 compares the reproduced time stamp with the reference time stamp, and supplies a signal indicating the comparison result to the data IF decoder 36. Data IF decoder 36
Is transmitted from the 6-track memory unit 35 at the timing when the reproduction time stamp matches the reference time stamp.
Reads and outputs the transport packet. Also,
The time stamp counter 38 receives the reference signal REF27M
Is divided to generate a 30 Hz reference signal REF30,
It is supplied to the 3 frequency divider 39 and the servo unit 52. The ３ frequency divider 39 divides the reference signal REF30 by １ ／ to obtain 10H
A z reference signal REF10 is generated and supplied to each unit. The 6-track memory unit 35 includes a switch circuit 34 (SW
34), and the configuration other than that shown in FIG. 9 is the same as the configuration shown in FIG.

Here, since the reference signal REF30 serving as the reference of the servo unit 52 is generated by dividing the reference signal REF27M serving as the reference of the time stamp, the time stamp and the reference signal REF30 are synchronized. Become. Therefore, the read timing of the 6-track memory unit 35 and the time stamp generation timing at the time of recording are synchronized, and the output time interval of the transport packet can be equal to the arrival time interval at the time of recording. .

The data read from the magnetic disk 200 or the magnetic tape 100 does not change the read timing regardless of whether the data stored in the six-track memory unit 35 is read data. Similarly, the reproduction data from the magnetic disk 200 and the reproduction data from the magnetic tape 100 can be synchronously switched.

(Third Embodiment) In the present embodiment, only a part of data to be recorded on the magnetic tape 100 is recorded on the magnetic disk 200, and until a desired reproduction position on the magnetic tape 100 is accessed, The contents recorded on the magnetic disk 200 are output, and when the magnetic tape 100 reaches the desired reproduction position, the reproduced data from the magnetic disk 200 is converted into the reproduced data from the magnetic tape 100 by synchronizing the two reproduced data. It is designed to be switched. The configuration of the device is the same as that shown in FIGS. 1 and 6, and is controlled so as to operate as described below.

For example, when the input digital signal at the time of recording is 1
In the case of a movie (image data and audio data) signal of 20 minutes, all the input signals are recorded on the magnetic tape 100, and the signal is recorded on the magnetic disk 200 for 15 minutes as shown by hatching in FIG. A part of the input signal is recorded at a rate of 5 minutes.

At the time of reproduction, when the magnetic tape 100 has been rewound to the beginning, if it is desired to reproduce any part of the first 15 minutes, the magnetic tape 100 is fast-forwarded and the absolute track number ATNt is set to the desired value. And playback is started. Further, for example, when it is desired to play back from the time point when 45 minutes have elapsed, the following operation is performed.

1) The head disk absolute track number ATNd of the part for 45 to 50 minutes is searched from the file recorded on the magnetic disk 200, and reproduction is started from the position of the disk absolute track number ATNd. 2) While reproducing from the magnetic disk 200, the magnetic tape 100 is fast-forwarded, and the magnetic tape 100 is read from a position where the absolute track number ATNt obtained from the reproduced data from the magnetic tape 100 and the disk absolute track number ATNd substantially match. 100 normal reproduction is started. 3) Fine adjustment of the reproduction position of the magnetic tape 100 by the above-mentioned method so that the absolute track number ATNt reproduced from the magnetic tape 100 and the disk absolute track number ATNd reproduced from the magnetic disk 200 exactly match. That is, the synchronization process is performed. 4) When ATNt = ATNd, the reference signal RE
The switch circuit 34 is switched from the terminal b to the terminal a in synchronization with F10.
, And then the reproduction from the magnetic disk 200 is stopped.

As described above, in this embodiment, the magnetic tape 100 is moved to a desired reproduction position, and the disk absolute track number ATNd of the reproduction data being reproduced from the magnetic disk 200 at that time, and the reproduction from the magnetic tape 100, Since the process of matching the absolute track number ATNt of the data to be performed (synchronizing the reproduction data) is performed, and thereafter, the reproduction data from the magnetic disk 200 is switched to the reproduction data from the magnetic tape 100.
The continuity of the reproduction data is ensured, so that, for example, when a movie is reproduced, it is possible to perform smooth switching without disturbing images and sounds. Further, since the recording capacity of the magnetic disk 200 is only about one third of that of the magnetic tape 100, it is possible to configure a system that effectively utilizes the advantage of high-speed disk search and the advantage of large tape capacity. it can.

(Other Embodiments) The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, in the above-described embodiment, a magnetic disk is used as a disk-shaped recording medium, but an optical disk, a magneto-optical disk, or the like may be used.

In the above embodiment, a recording / reproducing apparatus having a recording function and a reproducing function has been described. However, a digital signal recording apparatus having only a recording function or a digital signal reproducing apparatus having only a reproducing function may be constituted. it can. In the third embodiment, the data to be recorded on the disc 200 is set at a ratio of 5 minutes to 15 minutes. However, the present invention is not limited to this, and if the original content changes in a short time, the content may be changed. May be recorded for 5 minutes from the point of change of. Further, the time for continuously recording on the disc 200 is not limited to 5 minutes, and may be 3 minutes or 10 minutes. In the above embodiment, the disk 200
The error correction coding and decoding processes are not performed on the data to be recorded in the.

[0050]

As described above in detail, according to the first aspect of the present invention, an absolute track number for identifying a track formed on a tape-shaped recording medium is generated, and the absolute track number is included in an input digital signal. The recording is performed on the tape-shaped recording medium by using a signal recorded on a predetermined number of tracks as a recording unit, and address information corresponding to the absolute track number is added to an input digital signal. Since recording on the disk-shaped recording medium is performed in the same recording unit as the recording unit, the tape-shaped recording medium and the disk-shaped recording medium can be easily used as necessary.

According to the second aspect of the present invention, the absolute track number for identifying the track recorded on the tape-shaped recording medium is read out and corresponds to the absolute track number recorded on the disk-shaped recording medium. The read address information is read out, and the absolute track number obtained from the address information is synchronized with the absolute track number read from the tape-shaped recording medium, and is recorded on the tape-shaped recording medium and the disc-shaped recording medium. Since the digital signal is reproduced, the reproduction signal is switched after synchronizing the absolute track number, that is, after synchronizing the reproduction signal from the tape recording medium with the reproduction signal from the disk recording medium. Smooth switching without omission or duplication is possible.

According to the third aspect of the present invention, an absolute track number for identifying a track formed on a tape-shaped recording medium is generated, the absolute track number is added to an input digital signal, and a predetermined number of tracks are added. Recording on a tape recording medium is performed using a signal recorded on a track as a recording unit, and address information corresponding to the absolute track number is added to an input digital signal, and the same recording unit as the recording unit on the tape recording medium is used. While recording on the disc-shaped recording medium is performed in recording units, during reproduction, an absolute track number for identifying a track recorded on the tape-shaped recording medium is read out and recorded on the disc-shaped recording medium. Address information corresponding to the absolute track number is read, and the absolute track number obtained from the address information is read. The digital signal recorded on the tape-shaped recording medium and the disc-shaped recording medium is reproduced by synchronizing the absolute track number read from the tape-shaped recording medium with the absolute track number. Has the effect of

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a main part of a recording system of a digital signal recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of a reproducing system of the digital signal recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining a recording pattern on a magnetic tape.

FIG. 4 is a diagram for explaining a configuration of ID information for storing an absolute track number (ATN).

FIG. 5 is a diagram for explaining a configuration of a file recorded on a magnetic disk.

FIG. 6 is a block diagram showing a configuration of a main part of a reproduction system.

FIG. 7 is a block diagram showing a modification of the configuration shown in FIG. 6;

FIG. 8 is a block diagram illustrating a configuration of a recording system of a digital signal recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 9 is a block diagram for explaining a configuration of a reproduction system of a digital signal recording / reproduction device according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a sync block to be recorded on a magnetic tape.

11 is a diagram showing a part of the packet header shown in FIG.

FIG. 12 is a diagram for explaining a third embodiment of the present invention.

[Explanation of symbols]

12 6-track memory (tape recording means) 13 error correction encoding section (tape recording means) 14 track format encoding section (absolute track number generating means, tape recording means) 15 tape recording / reproducing section (tape recording means) 21 sync block counter (Disk recording unit) 22 File format unit (disk recording unit) 23 Disk recording / reproducing unit (disk recording unit) 32 Track format decoding unit (absolute track number reading unit) 33 Error correction decoding unit 34 Switch circuit 35 6 track memory 41 File decoding unit (address information reading unit) 51 ATN comparison control unit (synchronous reproduction unit) 52 Servo unit (synchronous reproduction unit) 100 Magnetic tape (tape recording medium) 200 Magnetic disk (disk recording medium)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C018 CA00 CA05 DA05 DA08 DB00 DB07 DC01 FB01 5C053 FA21 FA23 GA11 GA16 GB06 GB07 GB10 GB15 GB21 GB38 GB40 JA24 KA04 KA08 KA20 5D044 AB05 AB07 BC01 CC03 CC04 DE02 DE03 DE15 DE37 DE38 DE71 DE91

Claims (3)

[Claims] 1. A digital signal recording apparatus for recording an input digital signal on a tape recording medium and a disk recording medium, wherein an absolute track for generating an absolute track number for identifying a track formed on the tape recording medium is provided. Number generating means, tape recording means for adding the absolute track number to the input digital signal, and recording on the tape-shaped recording medium a signal recorded on a predetermined number of tracks as a recording unit; and A digital signal recording apparatus, comprising: disk recording means for adding address information corresponding to an absolute track number and recording the same recording unit on the disk-shaped recording medium on the disk-shaped recording medium. 2. A digital signal reproducing apparatus for reproducing a digital signal from a tape-shaped recording medium and a disk-shaped recording medium on which a digital signal is recorded, wherein an absolute track for identifying a track recorded on the tape-shaped recording medium is provided. An absolute track number reading means for reading a number; address information reading means for reading address information corresponding to the absolute track number recorded on the disk-shaped recording medium; an absolute track number obtained from the address information; and the tape A digital signal reproducing apparatus comprising: a synchronous reproducing unit that reproduces a digital signal recorded on the tape-shaped recording medium and the disk-shaped recording medium by synchronizing an absolute track number read from the linear recording medium. 3. A digital signal recording / reproducing apparatus for recording an input digital signal on a tape-shaped recording medium and a disk-shaped recording medium and reproducing the recorded digital signal, wherein a track formed on the tape-shaped recording medium is identified. An absolute track number generating means for generating an absolute track number for performing the operation, adding the absolute track number to the input digital signal, and recording the signals recorded on a predetermined number of tracks on the tape-shaped recording medium as recording units. Tape recording means, and disk recording means for adding address information corresponding to the absolute track number to the input digital signal, and recording the disc-shaped recording medium in the same recording unit as the recording unit of the tape-shaped recording medium, Reading the absolute track number recorded on the tape-shaped recording medium A paired track number readout unit; an address information readout unit for reading out address information corresponding to the absolute track number recorded on the disk-shaped recording medium; an absolute track number obtained from the address information; and the tape-shaped recording medium A digital signal recording / reproducing apparatus comprising: a synchronous reproducing unit for reproducing a digital signal recorded on the tape-shaped recording medium and the disk-shaped recording medium by synchronizing with an absolute track number read from the digital signal recording / reproducing apparatus.