JP2001143390A - Digital signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital signal recording and reproducing device which can properly use either a tape type recording medium or a disk type recording medium at need and which can easily actualize a short-time time shifting function. SOLUTION: An input digital signal can be recorded on a magnetic tape and a magnetic disk in parallel. The input digital signal has a specific amount of data as its recording unit and an absolute track number ATN is added and recorded to the magnetic tape; and address information corresponding to the absolute track number ATN is added and converted into a file format appropriate for recording to the magnetic disk, and recorded on the magnetic disk in the same recording units as the aforementioned recording units. The magnetic tape and magnetic disk having the same contents can be reproduced synchronously and the synchronous reproduction can continuously be shifted to a copy mode wherein the playback signal from the magnetic disk is recorded to the magnetic tape.

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 and reproducing apparatus for recording a digital signal on a tape recording medium and a disk recording medium and reproducing the recorded digital signal.

[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. In Japanese Patent Publication No. 7-31905, a tape-shaped recording medium and a disk-shaped recording medium are used in combination, and the disk-shaped recording medium has a first few minutes of a unit of image information recorded on the tape-shaped recording medium. When a certain unit of the tape-shaped recording medium is accessed and the corresponding part of the disk-shaped recording medium is accessed, the corresponding part of the tape-shaped recording medium is accessed while reproducing the corresponding part. An access method in which reproduction of a disk-shaped recording medium is stopped when reproduction becomes possible and reproduction of a tape-shaped recording medium is started has been conventionally proposed.

[0004]

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 uses the short access time of a disk-shaped recording medium to compensate for the disadvantages 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.

For example, when recording a long-term program on a tape-shaped recording medium, when it is desired to reproduce the recorded content from the beginning before the recording of the program is completed, that is, when the program is already recorded during the recording of the program. There is a case where it is desired to realize a short time shift function of reproducing a portion which has already been completed, but the above-mentioned publication does not show a method for responding to such a demand.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and makes it possible to easily use a tape-shaped recording medium and a disk-shaped recording medium as needed, and to provide the above-described short time shift function. It is an object of the present invention to provide a digital signal recording / reproducing apparatus which can easily realize the above.

[0008]

According to the first aspect of the present invention, an input digital signal is recorded on a tape-shaped recording medium and a disk-shaped recording medium, and the recorded digital signal is reproduced. In the digital signal recording / reproducing apparatus, the input digital signal
Tape recording means for adding tape address information for specifying a recording position on the tape-shaped recording medium and recording on the tape-shaped recording medium; and disk address information corresponding to the tape address information in the input digital signal. A disk recording unit for additionally recording on the disk-shaped recording medium; and a tape address information reading unit for reading the tape address information recorded on the tape-shaped recording medium. Disc reproducing means for reproducing a signal recorded on the disc-shaped recording medium, comprising: tape reproducing means for reproducing a signal; and disc address information reading means for reading the disc address information recorded on the disc-shaped recording medium. And a tape address obtained from the disk address information. The tape reproducing means and the disk reproducing means so as to reproduce the digital signal recorded on the tape-shaped recording medium and the disk-shaped recording medium by synchronizing the tape information with the tape address information read from the tape-shaped recording medium. And a synchronous reproduction control means for controlling the synchronous reproduction control means for performing synchronous reproduction by the synchronous reproduction control means. From the synchronous reproduction mode, while continuing the reproduction operation by the disk reproduction means, the signal reproduced by the disk reproduction means is A tape recording means can continuously shift to a copy mode for recording on the tape-shaped recording medium.

Here, "tape address information" includes information indicating a recording position by an absolute address, such as an absolute track number of a tape-shaped recording medium, and an elapsed time from the start of a digital signal corresponding to one program ( Information such as a time code) indicating the recording position by a relative address.

According to a second aspect of the present invention, in the digital signal recording / reproducing apparatus according to the first aspect, when an input digital signal is recorded, the input digital signal is first recorded on a tape-shaped recording medium by a tape recording means and used. The recording operation by the tape recording means and the disk recording means is performed in parallel for a predetermined time from the point in time when the user issues a time shift reproduction instruction, and the recording operation by the tape recording means is performed after the predetermined time has elapsed. At the same time, the recording operation by the disk recording means is continued, the reproducing operation by the tape reproducing means is started during the recording operation by the disk recording means, and the predetermined time before the reproduction operation end time of the recorded portion is started. The synchronous playback by the synchronous playback control means is started, and the tape playback means terminates the playback operation. , Wherein the shifts to the copy mode.

According to a third aspect of the present invention, in the digital signal recording / reproducing apparatus according to the first or second aspect, the disc recording means and the disc reproducing means can operate in parallel. Here, “operable in parallel” means that the recording operation and the reproducing operation can be executed in a time-division manner or in parallel.

[0012] The invention according to claim 4 is the invention according to claims 1 to 3.
In the digital signal recording / reproducing apparatus according to any one of the above, the tape recording means stores an input digital signal in a sync block and records the input digital signal on the tape-shaped recording medium,
The disk recording means generates a recording file of a format corresponding to the sync block, and records the recording file on the disk-shaped recording medium.

According to a fifth aspect of the present invention, in the digital signal recording / reproducing apparatus according to the fourth aspect, the tape recording means stores dummy data as needed in a sync block storing the input digital signal. A sync block is additionally recorded on the tape-shaped recording medium, and the disc recording means constitutes the recording file except for the dummy data for the sync block storing the dummy data.

It is desirable that the transition from the synchronous reproduction mode to the copy mode is performed so that continuity of recording tracks on the tape-shaped recording medium can be maintained. Further, it is preferable that the recording unit is a unit for performing an error correction process. Further, 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.

[0015]

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 digital signal recording / reproducing apparatus according to a first embodiment of the present invention. This apparatus converts an MPEG transport stream into a predetermined format. The converted signal is recorded on a magnetic tape 100 as a tape-shaped recording medium and on a magnetic disk 200 as a disk-shaped recording medium, and the recorded signal is reproduced and output as an original MPEG transport stream.

The apparatus shown in FIG. 1 includes a TS decoder 11 for extracting an SCR (System Clock Reference) signal included in a transport stream,
MHz reference clock signal REF27M, and the SCR signal and the reference clock signal R
A recording time stamp for generating a recording time stamp for reproducing an arrival time interval of a packet to be recorded based on the EF 27M and generating a 10 Hz reference signal REF10REC for recording corresponding to a recording cycle of one recording unit to be described later. A unit 12, a time stamp adding unit 13 for adding a time stamp to the input signal and outputting the same, a switch 14, and generating and modulating the recording signal.
It is composed of a tape signal processing unit 15 for demodulating a reproduction signal and extracting control information such as data such as images and sounds and ID information, and a magnetic head, a recording amplifier, a reproduction amplifier, and the like. A tape recording / reproducing unit 16 for reproducing a signal from the magnetic tape 100, a packet counter 17 for counting the number of packets of an input transport stream, a memory 18 for temporarily storing a signal to be recorded on the disk 200, A disk signal processing unit 19 for performing processing such as a configuration of a file to be recorded and returning a reproduced file to original data;
A magnetic disk 2 composed of a recording amplifier, a reproducing amplifier, etc.
00, a disk recording / reproducing unit 20 for reproducing signals from the magnetic disk 200, a memory 22 for temporarily storing a signal reproduced from the disk 200 in a copy mode described later, and a signal from the memory 22. , A TS encoding unit 23 forming a transport stream, a memory 24 for temporarily storing a signal reproduced from the magnetic disk 200, and a switch 25.
A reproduction time stamp generation unit 26 that generates a reproduction time stamp based on the reference clock signal REF27M, generates and outputs a 10 Hz reference signal REF10PB for reproduction, and a signal reproduced from the magnetic tape 100 or the magnetic disk 200. Encoding unit 27 for returning the original MPEG transport stream to output
And

The switch 14 is connected to a terminal a when recording an input transport stream on the magnetic tape 100, and in a copy mode for recording a transport stream reproduced from the magnetic disk 200 on the magnetic tape 100. , Terminal b. The switch 25 is connected to the terminal a when outputting a recording signal, is connected to the terminal b when outputting a signal reproduced from the magnetic disk 200, and is connected to the terminal b when outputting a signal reproduced from the magnetic tape 100. , Terminal c.

The tape signal processing circuit 15 includes a six-track memory for storing signals for six tracks on a magnetic tape, an error correction encoding circuit for performing error correction encoding of a recording signal, and a sync pattern or control information for an input signal. A track format encoding circuit that forms a sync block by adding ID information of the above, forms a recording signal so that a predetermined track is formed on the magnetic tape, and further modulates the recording signal. It comprises a track format decoding circuit for demodulating the reproduced signal, extracting data, and the like, an error correction decoding circuit for performing error correction decoding of the reproduced signal, and the like.

The data for six tracks stored in the six-track memory of the tape signal processing unit 15 is data that is a unit of error correction encoding and decoding, that is, a unit of error correction. Called a unit. In this embodiment, since one recording unit corresponds to a recording time of 0.1 second, the 10 Hz reference signals REF10REC and REF1
0PB is supplied to each unit.

The disk signal processing unit 19 reads out data from the memory 18 and forms a file as a unit to be recorded on the disk 200.
It comprises a file decoding circuit for returning the reproduced file to the original data. The memory 18 stores the tape signal processing unit 1
5 stores the same data as the 6-track memory. However, the dummy data is stored in the six-track memory when the data amount of the input digital signal is small, but the dummy data is not stored in the memory 18.

FIG. 2 is a diagram 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 tape signal processing unit 15 calculates the absolute track number ATN defined by the following equation (1).
Is performed to write 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. 3, 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, and the SF information is 11B (B is 2
) To indicate that it is a hexadecimal number)
Indicates that the absolute track number ATN is supported. The sync block number is the bit b of the second byte ID1.
3 to b0.

The sync block composed of the track format encoding circuit of the tape signal processing unit 15 is composed of two consecutive sync blocks as shown in FIG.
It is defined to store 188 bytes (92 bytes + 96 bytes) of data of the G2 transport packet, and the time stamp is stored and recorded in the packet header.

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 circuit of the disk signal processing unit 19 reads the data stored in the memory 18 and converts it into a file to be recorded on the disk 200 (hereinafter referred to as a “disk recording file”). I do. FIG. 4A is a diagram showing a first format of a disk recording file generated by the file format circuit. This file includes file information (N bytes (for example, 3 bytes)) and an absolute track number ATNd ( 4 bytes) and the number RE of packets stored in the memory 18 that is input from the packet counter 17
CTS (2 bytes), the same packet header PH (4 bytes) as the 4-byte packet header shown in FIG. 5, and the valid data TSDATA (18) stored in one packet corresponding to the time stamp indicated by the packet header PH.
8 bytes).

Here, the absolute track number ATNd (hereinafter referred to as "disc absolute track number ATNd") written in the disk recording file is the absolute track number ATN of the track on which data in the six-track memory is recorded first. Valid data T immediately before the next absolute track number ATNd from the disk absolute track number ATNd
Up to SDATA corresponds to a recording unit on a magnetic tape, that is, data for six tracks. The absolute track number ATN is supplied from the tape signal processing unit 15 to the disk signal processing unit 19. Also valid data TSDATA
Corresponds to net data excluding the 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 which can be divided by 6
If control is performed so that the first data of the six-track memory is recorded on the TN track, a value obtained by dividing by six 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 circuit of the disk signal processing unit 19 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 a predetermined number of tracks (tracks of an integral multiple of the recording unit (6 tracks)). Number, for example, 12 tracks)
As a file, a disk recording file is sequentially constructed and output.

The disk recording file output from the disk signal processing unit 19 is supplied to a disk recording / reproducing unit 20, which records the disk recording file on the magnetic disk 200. In this embodiment, the recording of the signal on the magnetic disk 200 and the reproduction of the signal from the magnetic disk 200 can be performed in parallel. That is, when the recording operation is performed in a time shorter than the actual time when the input digital signal is input (for example, 1/2 time), and the reproducing operation from the magnetic disk 200 is performed during the time when the recording operation to the magnetic disk 200 is not performed It is configured to execute a dividing operation.

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.

When performing only the recording operation on the magnetic disk 200 without performing the recording operation on the magnetic tape 100, the absolute track number ATN is not generated. The second format does not include the absolute track number ATN as shown in b).

Next, the operation at the time of reproduction will be described. When performing reproduction from the magnetic tape 100, the switch 25 is connected to the terminal c.
Connected to. The tape signal processing unit 15 performs processing such as demodulation of a reproduction signal, extraction of data, and error correction decoding, and stores the processed signal in a six-track memory. The reproduction time stamp generation unit 26 generates a reference time stamp based on the reference clock signal REF27M, and supplies the reference time stamp to the TS encoding unit 27. In the TS encoding unit 27, the reproduced time stamp is compared with the reference time stamp, and a transport packet is read from the 6-track memory of the tape signal processing unit 16 and output at a timing when the two match. This allows
The read timing from the 6-track memory at the time of reproduction is synchronized with the time stamp generation timing at the time of recording, and the output time interval of the transport packet is equal to the arrival time interval at the time of recording.

When reproducing data from the magnetic disk 200, the switch 25 is connected to the terminal b. In the disc signal processing unit 19, a process of returning the file generated at the time of recording to the original transport stream is performed,
The processed signal is stored in the memory 24. The read timing from the memory 24 is controlled so that the reproduction time stamp matches the reference time stamp as in the case of reproducing the magnetic tape 100. In a copy mode in which a signal reproduced from the magnetic disk 200 is recorded on the magnetic tape 100, an output signal of the disk signal processing unit 19 is stored in the memory 22. The TS encoding unit 23 compares the reproduced time stamp with the reference time stamp, reads a transport packet from the memory 22 at a timing when the two match, and outputs the transport packet to the switch 14.

Next, synchronous reproduction of the magnetic tape 100 and the magnetic disk 200 will be described with reference to FIG. FIG.
1 shows a part of the components shown in FIG. 1 and additionally shows an ATN comparison control unit 51, a servo unit 52, and a tape drum drive system 53. 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. In FIG. 7, the absolute track number ATN reproduced from the magnetic tape 100 output from the tape signal processing unit 15 is represented by “ATNt” to indicate that it is the absolute track number ATN reproduced from the magnetic tape. Is shown. The ATN comparison control unit 51 calculates the difference value δ = ATNd−ATNt, supplies the difference value δ to the disk signal processing unit 19 and the servo unit 52, and changes the control signal SW of the switch 25 when δ = 0. Thus, the switching control of the switch 25 is performed.

First, during data reproduction from the magnetic tape 100 (while the switch 25 is connected to the terminal c),
A case of switching to data reproduced from the magnetic disk 200 will be described. The tape signal processing unit 15 and the disk signal processing unit 19 each have an absolute track number ATN.
t and the disk absolute track number ATNd are input to the ATN comparison control unit 51. Note that the absolute track number ATN
In t, an offset value corresponding to the time required for error correction decoding processing is added, and when ATNt = ATNd, the same data can be input to the terminals b and c of the switch 25. ing. For example, if it takes 10 tracks of processing time for the tape signal processing unit 15 to output reproduced data from the magnetic tape 100, the absolute track number ATNt is obtained by subtracting 10 from the reproduced absolute track number ATN. It is said.

1) If the difference value δ = 0, the switch 25
Since the data input to the terminals b and c are the same, the ATN comparison control unit 51 sets the reference signal REF10PB
, A control signal SW for switching the switch 25 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. Absolute track number AT
Since Nd data exists, the disk signal processing unit 19
Is an appropriate disk absolute track number ATN according to δ.
The data of d is searched, and output is started 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 determines the appropriate disk absolute track number A according to δ.
The TNd data is searched, and output is started again from the data.

In the cases 2) and 3) above, δ
If = 0, the same processing is repeated, and the switch 25 is switched in synchronization with the reference signal REF10PB 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 25, the magnetic tape 100
May be stopped.

Next, during reproduction of data from the magnetic disk 200 (while connected to the switch 25 terminal b),
A case of switching to data reproduced from the magnetic tape 100 will be described. 1) When δ = 0, it is the same as 1) above.

2) When δ> 0, that is, when the magnetic tape 100 has not reached the position where it should be originally reproduced, the servo unit 52 sets the magnetic tape 100 according to the difference value δ.
At a tape feed speed higher than usual, and the reproduction position is moved 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. 2, δ = 4
Corresponds to a shift of one pulse of the CTL signal. Therefore, C
If the magnetic tape 100 is fast-forwarded by δ / 4 pulse of the TL signal, it is expected that ATNt = ATNd. However, since the reproduction from the magnetic disk 200 proceeds even during the fast-forward operation, the disk absolute track number ATN
Although d is always updated, by repeating the above operation, the reproduction position of the magnetic tape 100 can be moved to the synchronization position, and finally δ = 0 can be set.
In this state, the switch 25 may be switched from the terminal b to the terminal c in synchronization with the reference signal REF10PB.

3) When δ <0, that is, when the magnetic tape 100 has passed the position to be 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 described in 2) above.
Is the same as

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 25, the reproduction of 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. And smooth switching is possible.

Next, referring to FIG. 6, during the recording operation on the magnetic tape 100, while the recorded signal is reproduced from the beginning,
A time shift operation for continuing the recording operation of the input digital signal and finally recording all the input digital signal on the magnetic tape 100 will be described. 2A shows an input digital signal, that is, an MPEG transport stream, and FIGS. 2B and 2C show the recording / reproducing operation of the magnetic tape 100 and the magnetic disk 20 respectively.
0 shows a recording / reproducing operation.

First, from time t0, the input digital signal P1
Is started on the magnetic tape 100. At this time, the switch 14 is connected to the terminal a, and the switch 25 is connected to the terminal a. And the input digital signal P
Assuming that the user instructs rewind / simultaneous reproduction (time shift reproduction) at time t1 during recording of the first digital signal P1 for a predetermined time TOL from that time.
1 is continued to be recorded on the magnetic tape 100, and the operation of recording the input digital signal P1 also on the magnetic disk 200 is started from time t1. Therefore, the digital signal P1 is applied to the magnetic tape 10 between the times t1 and t2.
0 is recorded on the magnetic disk 200 in an overlapping manner.

At a time t2 after a lapse of a predetermined time TOL, the recording on the magnetic tape 100 ends, and the operation of recording the input digital signal P2 on the magnetic disk 200 is continued. That is, the recording mode for recording a signal on the magnetic disk 200 is maintained as it is, and the digital signal P2 is recorded following the last predetermined time TOL portion of the digital signal P1. At this time, the absolute track number ATN of the last recording unit recorded on the magnetic tape 100 is held as the last recorded absolute track number ATN (ATNe). The symbols P1 and P attached to the input digital signal
Numeral 2 is simply added to distinguish a part recorded on the magnetic tape 100 from a part that has not been recorded. Actually, it may be one program (program) or at time t2. May change in the vicinity of the program.

When recording is performed only on the magnetic disk 200, since the absolute track number ATN is not generated, recording is performed in the second file format shown in FIG. 4B as described above. From time t2, an operation of rewinding the magnetic tape 100 to the recording start position of the digital signal P1 is performed according to the operation of the user, and a reproducing operation of the digital signal P1 recorded on the magnetic tape 100 is started from time t3. During the rewind operation, the 10 Hz reference signal
10REC is switched to REF10PB at time t
At 3, the switch 25 is switched from terminal a to terminal c. Then, the synchronous reproduction of the magnetic disk 200 and the magnetic tape 100 is started from a time t4 before a predetermined time TLO before the scheduled reproduction end time t5 of the digital signal P1 (transition to a synchronous reproduction mode). At this time, the magnetic disk 2
The operation of recording the digital signal P2 at 00 continues.
That is, recording and reproduction on the magnetic disk 200 are executed in parallel in a time-division manner. The predetermined time TLO is equal to the time t
This is the time during which overlap recording is performed from 1 to t2, the predetermined time TLO, the absolute track number ATN and the final recording absolute track number ATN (ATN) of the signal being output.
Based on e), it is possible to determine the time t4 at which the synchronous reproduction is started. During the synchronous reproduction, the switch 14 is switched from the terminal a to the terminal b, and the switch 25 is switched from the terminal c to the terminal b.

At time t5, the mode shifts from the synchronous reproduction mode to the copy mode in which the digital signal P2 reproduced from the magnetic disk 200 is recorded on the magnetic tape 100. A signal reproduced from the magnetic disk 200 and output from the disk signal processing unit 19 is input to the tape signal processing unit 15 via the memory 22, the TS encoding unit 23, and the switch 14, and is recorded on the magnetic tape 100. At this time, REF10PB is continuously used as the 10 Hz reference signal. Since the time stamp is added to the signal reproduced from the magnetic disk 200, there is no particular problem in reproducing the arrival time interval of the input transport stream even if the reference signal is REF10PB. The first absolute track number ATN recorded on the magnetic tape 100 is the last recorded absolute track number ATN described above.
It is determined based on (ATNe) to maintain the continuity of the absolute track number ATN. For example, when the track pitch is 29 μm, the absolute track number is 1 in 6 tracks.
Since it is increased by two, the first absolute track number ATN in the copy mode is ATN (ATNe) +12. By setting the absolute track number ATN in this way, the continuity of the absolute track number ATN can be maintained.

Thereafter, at time t6, the digital signal P
At the time t7, the operation in the copy mode, that is, the operation of reproducing the digital signal P2 from the magnetic disk 200 and recording it on the magnetic tape 100 is ended.

As described above, according to the present embodiment, the reproduction of the recorded digital signal is started during the recording of the input digital signal, and the recording is continued while maintaining the continuity of the input digital signal. Magnetic tape 10
It is possible to realize a short time shift operation in which all input digital signals are recorded at 0. Moreover, at the end of the input digital signal, all signals are recorded on the magnetic tape 100 while maintaining continuity.
The same recorded tape as when recorded on 00 can be obtained. Further, in the time-shift reproduction, when the medium is switched, the continuity of the signal is maintained by the synchronous reproduction, so that there is no omission or duplication of the signal at the time of the switching, and smooth switching can be performed.

The normal recording / reproducing, which reproduces after recording all the programs to be recorded, also realizes a time shift in a broad sense. However, in the case of the present embodiment, such reproduction is started from the middle of recording. Since this operation is different from a simple recording / reproducing operation, it is called a “short time shift” operation.

The signal processing in the tape signal processing section 15 and the amplification processing in the tape recording / reproducing section 16 require a processing time TPR unique to the apparatus. Therefore, in the copy mode, the memory 22 responds to the processing time TPR. The timing adjustment process of the signal
00 is maintained.

As shown in FIG. 8, after the recording of the input digital signal on the magnetic tape 100 is started (at time t).
0), when the time until the time shift reproduction instruction (time t1) is issued is long, the synchronous reproduction is performed at time t4 after the end of the recording of the digital signal P2 on the magnetic disk 200 (time t6). , It is not necessary to execute the recording operation and the reproducing operation in a time-division manner.

(Second Embodiment) In this embodiment, the format of a file recorded on the magnetic disk 200 is a format corresponding to a sync block recorded on the magnetic tape 100. The basic configuration and operation are the same as in the first embodiment.

FIG. 9 is a block diagram showing a configuration of a main part of a digital signal recording / reproducing apparatus according to a second embodiment of the present invention. This apparatus is the same as that of the apparatus according to the first embodiment shown in FIG. The switch 14, the packet counter 17, and the memory 18 are deleted, a SYNC data correction unit 31 is added, the TS encoding unit 23 is changed to a SYNC data decoding unit 32, and the tape signal processing unit 15 and the disk signal processing unit 19 are changed. To the tape signal processing unit 1
5a and a disk signal processing unit 19a. The output of the time stamp adding unit 13 is directly connected to the tape signal processing unit 15a, and the SYNC data correction unit 31 is configured to be supplied with necessary signals from the tape signal processing unit 15a.

FIG. 10 is a block diagram for explaining the features of this embodiment in more detail.
5a is a SYNC format circuit 41 constituting a sync block storing an input digital signal, a main header decode circuit 43 for decoding a main header MH in the sync block, a switch 44, and a predetermined track formed on a magnetic tape. And a track format circuit 45 for controlling the operation.

The SYNC format circuit 41 adds a sync pattern, ID information, and a main header MH to the transport packet input from the time stamp adding unit 13.
Are generated to output a sync block as shown in FIG. The main header MH includes format information (bits B7 to B4 of the first byte) and sync block information (bits B3 of the first byte to bits B0 of the second byte) as shown in FIG. (SB number). That is, in FIG. 11, "n" is an integer from 0 to 27, and there are 12 definitions. In this figure, DT
Is a data type, and is information indicating any of normal reproduction data, dummy data, and special reproduction data. SBC is a sync block count,
This is information indicating the relationship between original digital data such as an MPEG2 transport bucket and data in a sync block block. TCR is TCR information indicating a time compression ratio, Format ID is information indicating whether a track format is based on a normal mode recording or another recording mode, and AD is a recording digital signal having a packet size of 188 bytes. MPEG transport stream packet or packet size 1
This is information for identifying whether the packet is a 40-byte packet of another transmission scheme. The dummy data is data that is appropriately inserted when the data amount of the input digital signal per unit time is small.

The main header decode circuit 43 refers to the main header MH in the sync block and supplies information indicating whether or not the sync block stores dummy data to the SYNC data correction unit 31. The SYNC data correction unit 31 performs correction processing of the sync block data in advance so that the file format is as shown in FIG. At this time, the sync block storing the dummy data is modified so that only the data AUX (1 byte) storing the main header MH and the pack data is recorded. Except for the sync block of the dummy data, the first byte of the main header MH and all data other than the second byte, excluding the inner correction code (inner parity), are output. The signal output from the SYNC data correction unit 31 is stored in the memory 19b of the disk signal processing unit 19a, and is sequentially recorded on the magnetic disk 200.

The file format shown in FIG. 12A corresponds to the first file format shown in FIG. 4A, and shows the format of the disk recording file in the present embodiment. The disk recording file in the present embodiment includes file information (N bytes (for example, 3 bytes)), an absolute track number ATNd (4 bytes) supplied from the tape signal processing unit 15a, and a sync block number recorded on one track. Data DATA below the first byte of the main header MH of the sync block from 0 to 355 and the second byte of the main header MH (the second byte of the main header MH excluding inner parity +
(Data AUX + packet header + data = 98 bytes)
Composed of However, as described above, for the sync block of the dummy data, the second byte of the main header MH is added to the first byte of the main header MH.
AUX (1 byte) that stores data and pack data
Only the information is stored and recorded in the disk recording file.

When an operation of recording only on the magnetic disk 200 is performed, a file format not including the absolute track number ATNd as shown in FIG. 12B is employed as in the case shown in FIG. 4B. Is done. With the above configuration, during a normal recording operation, the switch 44 is connected to the terminal a, and the sync block output from the SYNC format circuit 41 is connected to the track format circuit 45,
The data is recorded on the magnetic tape 100 via the tape recording / reproducing unit 16. Then, the magnetic tape 100 and the magnetic disk 2
In a period (t1 to t2 in FIG. 6) in which recording is performed overlapping with 00, recording on the magnetic disk 200 is performed in the file format shown in FIG. In FIG. 6, t2 to t5), recording on the magnetic disk 200 is performed in the file format shown in FIG.

In the copy mode, the switch 4
4 is connected to a terminal b, and a sync block reproduced from the magnetic disk 200 is supplied to a SYNC data decoding unit 32.
Supplied to The SYNC data decoding unit 32 refers to the data type DT stored in the first byte of the main header MH of the sync block. If the sync block is not a sync block of dummy data, the following 9
If it is a sync block of dummy data, the following two bytes of data (the second byte of the main header + data AUX) and a value of 96 bytes
Is supplied to the track format circuit 45 via the switch 44.

As described above, in this embodiment, the file format recorded on the magnetic disk 200 is as shown in FIG.
Since the format corresponding to the sync block to be recorded on the magnetic tape as shown in FIG. 2 is employed, it is not necessary to perform the TS encoding process (packet time interval reproduction process) in the copy mode as in the first embodiment. Can be further simplified.

(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, the absolute track number ATN is used as the tape address information for specifying the recording position on the magnetic tape. However, the present invention is not limited to this. For example, a digital signal corresponding to one program may be used. Information indicating a relative address such as a relative track number based on the track corresponding to the recording start position or an elapsed time (time code) from the start point of the digital signal corresponding to one program may be used.

Although a magnetic disk is used as a disk-shaped recording medium, an optical disk, a magneto-optical disk, or the like may be used. Further, in the above-described embodiment, the recording and reproduction of the magnetic disk 200 are performed in a time-division manner so that both are executed in parallel. However, the recording magnetic head and the reproduction magnetic head are provided, and the recording and reproduction are performed. And reproduction may be executed simultaneously.

[0064]

As described in detail above, according to the present invention, tape address information indicating a recording position is added to an input digital signal to perform recording on a tape-shaped recording medium, and the tape is added to the input digital signal. While the disc address information corresponding to the address information is added and recorded on the disc-shaped recording medium, during reproduction,
By synchronizing the tape address information obtained from the disk address information recorded on the disk-shaped recording medium with the tape address information read from the tape-shaped recording medium, digital data recorded on the tape-shaped recording medium and the disk-shaped recording medium are synchronized. From a synchronous reproduction mode in which signals can be reproduced and synchronous reproduction is performed, a copy mode in which a signal reproduced from the disk-shaped recording medium is recorded on a tape-shaped recording medium while the reproduction operation of the disk-shaped recording medium is continued. Can be continuously transferred to the tape-type recording medium and the disk-type recording medium, and by appropriately executing the synchronous reproduction operation, a short time shift operation can be easily performed. Can be realized.
In addition, by synchronous reproduction, it is possible to smoothly switch from reproduction of a tape-shaped recording medium to reproduction of a disk-shaped recording medium having the same contents. By recording, finally, the entire input digital signal can be recorded on the tape-shaped recording medium while maintaining continuity.

[Brief description of the drawings]

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

FIG. 2 is a diagram for explaining a magnetic tape-shaped recording pattern.

FIG. 3 is a diagram showing a configuration of control information recorded on a magnetic tape.

FIG. 4 is a diagram showing a format of a file recorded on a magnetic disk.

FIG. 5 is a diagram for explaining a configuration of data recorded on a magnetic tape.

FIG. 6 is a time chart for explaining a time shift function.

FIG. 7 is a block diagram showing a configuration for explaining synchronous reproduction.

FIG. 8 is a time chart for explaining a time shift function.

FIG. 9 is a block diagram showing a configuration of a main part of a digital signal recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 10 is a block diagram for explaining the configuration of FIG. 9 in detail;

FIG. 11 is a diagram for explaining a configuration of a main header.

FIG. 12 is a diagram showing a format of a file recorded on a magnetic disk.

[Explanation of symbols]

11 TS decoding unit (tape recording unit, disk recording unit) 12 recording time stamp generation unit (tape recording unit, disk recording unit) 13 time stamp adding unit (tape recording unit, disk recording unit) 15, 15a Tape signal processing unit ( Tape recording means, tape reproducing means, tape address information reading means) 16 tape recording / reproducing section (tape recording means, tape reproducing means) 17 packet counter (disk recording means) 18 memory (disk recording means) 19, 19a disk signal processing section (Disk recording means, disk reproducing means, disk address information reading means) 20 Disk recording / reproducing section (disk recording means, disk reproducing means) 22, 24 Memory (disk reproducing means) 23 TS encoding section (disk reproducing means) 26 Playback time Amp generating unit (tape reproducing unit, disk reproducing unit) 27 TS encoding unit (tape reproducing unit, disk reproducing unit) 31 SYNC data correcting unit (disk recording unit) 32 SYNC data decoding unit (tape recording unit) 51 ATN comparison control unit (Synchronous reproduction control means) 52 Servo unit (synchronous reproduction control means) 100 Magnetic tape (tape recording medium) 200 Magnetic disk (disk recording medium)

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) AA38 BA11 BB18 CA02 DC01 DD01 DE01 DE13 EA11 GA01

Claims (5)

[Claims] 1. 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. Tape recording means for adding tape address information for specifying the recording position of the disc to record on the tape-shaped recording medium; and adding disc address information corresponding to the tape address information to the input digital signal to produce the disc-shaped data. Tape playback for reproducing a signal recorded on the tape-shaped recording medium, comprising: a disk recording means for recording on a recording medium; and a tape address information reading means for reading the tape address information recorded on the tape-shaped recording medium. Means, before being recorded on the disc-shaped recording medium A disk reproducing unit that includes a disk address information reading unit that reads disk address information and reproduces a signal recorded on the disk-shaped recording medium; a tape address information obtained from the disk address information; Synchronous playback control means for controlling the tape playback means and the disk playback means so as to synchronize the tape address information to be read and to play back the digital signals recorded on the tape-shaped recording medium and the disk-shaped recording medium. From the synchronous reproduction mode in which synchronous reproduction is performed by the synchronous reproduction control means, while the reproduction operation by the disk reproduction means is continued, a signal reproduced by the disk reproduction means is transmitted to the tape-shaped recording medium by the tape recording means. Continuous transition to copy mode for recording Digital signal recording and reproducing apparatus, characterized in that the. 2. When an input digital signal is recorded, the input digital signal is first recorded on a tape-like recording medium by a tape recording means, and the tape recording is performed for a predetermined time from a point in time when a user issues a time shift reproduction instruction. Means and the recording operation by the disk recording means are performed in parallel, and after the predetermined time has elapsed, the recording operation by the tape recording means is terminated, and the recording operation by the disk recording means is continued. Starting the reproducing operation by the tape reproducing unit during the execution of the recording operation, starting the synchronous reproduction by the synchronous reproduction control unit from the predetermined time before the end of the reproducing operation of the recorded portion,
At the end of the playback operation by the tape playback means,
2. The method according to claim 1, wherein the mode shifts to the copy mode.
2. A digital signal recording / reproducing apparatus according to claim 1. 3. The digital signal recording / reproducing apparatus according to claim 1, wherein the disk recording means and the disk reproducing means are operable in parallel. 4. The tape recording means stores the input digital signal in a sync block and records it on the tape-shaped recording medium, and the disc recording means generates a recording file in a format corresponding to the sync block, 4. The digital signal recording / reproducing apparatus according to claim 1, wherein the recording file is recorded on the disc-shaped recording medium. 5. The tape recording means according to claim 5, wherein said tape recording means additionally records, if necessary, a sync block storing dummy data to said sync block storing said input digital signal. 5. The digital signal recording / reproducing apparatus according to claim 4, wherein, for the sync block storing the dummy data, the recording file is configured excluding the dummy data.