JPH01151081A - Data recording and reproducing system for rotary head type tape recorder - Google Patents

Abstract

PURPOSE:To improve the responsibility and efficiency of data recording and reproducing by recording a first identifying signal to show the recording condition of a sector in a data area and a second identifying signal to show that the sector in the data area is in the condition in which recording and reproducing cannot be executed, in a target area. CONSTITUTION:The section between the starting and termination of a tape is divided into plural areas and at the peak part of respective dividing areas, a target area TOC (table of contents) to record the target of the data recorded in respective dividing areas is formed. A first identifying signal to show the recording condition of a sector in the data area and a second identifying signal to show that the sector in the data area is in the condition in which recording and reproducing cannot be executed are recorded in the target area. Consequently, it can be easily known which part of the tape falls in the condition in which recording and reproducing cannot be executed and thus, the responsibility and the efficiency of the data recording and reproducing with the tape can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a data recording and reproducing method for using, for example, a rotary head digital audio tape recorder (R-DAT) as a storage device for information equipment. be.

(B) Conventional technology Conventionally, in R-DAT, an information recording area for recording digitally converted music signals is formed in the center of the trace of each track of a tape that is helically scanned by a rotating head, and a A tracking area (ATF area) and a subcode area are formed on both sides of the recording area, that is, at the trace start end and the trace end of each track. A servo signal for tracking control is recorded in this tracking area, and a start ID indicating the beginning of the song is recorded in the subcode area along with song number and time information.
etc. were recorded.

However, recently, it has been considered to use such R-DAT as a storage device for information equipment; for example, 120
R-DAT, which uses minute tapes, can achieve a storage capacity of approximately IGBytes, making it a storage device with a lower price, larger capacity, and smaller space than the MT devices and hard disk devices that were conventionally used as storage devices. can be provided.

(c) Problems to be Solved by the Invention Specifically, when such an R-DAT is used as a storage device for information equipment, its track format is compliant with audio, and the above-mentioned information recording area is replaced with a music signal. However, it is not possible to record multiple programs and digital data sequentially from the beginning of the tape to the end in the same way as when recording music signals.
There is a problem in that the responsiveness when reading a program or digital data after recording is extremely poor compared to a disk device. In addition, when recording a program or digital data, you can easily find out to what part of the tape recording has ended, where the recordable part that occurs due to partial erasure after recording is located, and what its capacity is. There wasn't. Furthermore, it has not been possible to easily find out which part of the tape is in a state where recording and playback is impossible due to scratches on the tape itself.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a data area on a tape that is helically scanned by a rotating head, and programs and digital data recorded in the data area. A rotary head tape recorder that has a catalog area for recording the catalog of the data area, and records programs and digital data in this data area in units of sectors, with two tracks as one frame and multiple frames as one sector. Then, in the inventory area, a first identification signal indicating the recording status of the sector in the data area and a second identification signal indicating that the sector in the data area is in a recording/reproduction disabled state are recorded. This is what I did.

(e) Effect: According to the data recording and reproducing method of the present invention described above, programs and digital data can be managed for each divided area, and when recording new programs and digital data, it is possible to record up to which part of the tape. has ended,
In addition, it is possible to easily know where the recordable portion caused by partial erasure after recording is located and its capacity, and which portion of the tape is in a state where recording and reproduction are impossible.

(f) Examples An embodiment of the present invention will be described below with reference to the drawings.

That is, according to the data recording and reproducing method of the present invention, the tape is divided into a plurality of areas between the beginning and the end, and a catalog area is provided at the beginning of each divided area to record a list of data recorded in each divided area. It is designed so that tapes can be divided and managed.

Also, when recording programs and digital data on each track in the data area other than the catalog area of this divided area, it is recorded in sector units, with two tracks as one frame and multiple frames (eight frames in this case) as one sector. At the same time, a first identification signal indicating the recording status of the sector in the data area and a second identification signal indicating that the sector in the data area is in a recording/reproduction disabled state are recorded in the inventory area. This is what I did. Hereinafter, this divided area will be referred to as a class, and its catalog area will be referred to as T OC (t
In the present invention, this division management method, which divides the beginning and end of the tape into multiple classes, is referred to as the "able of content's" area, and is referred to as the "r class format".
It is called. Specifically, Figure 1 shows a case where a 120-minute tape is divided into eight classes at equal intervals, and in the data area of each class, programs and digital data are recorded in the information recording area of each track, and subcodes are recorded. The class number, sector number, information identification signal indicating whether the area is a TOC area or a data area, etc. are recorded in the area. The TOC area of each class is equivalent to 50 sectors, and the information recording area of each track can record the name of each program, the sector size of each program, etc. a first identification signal indicating whether the recording has been completed or the recording status thereof;

A second identification signal indicating which sector in the data area is in a non-recordable/reproducible state is recorded in the form of a map, and the same content as the subcode area in the data area described above can be recorded in the subcode area. Become. Here, the remaining area of each track, such as the ATF area, is an audio DAT.
shall conform to the track format of
FIG. 2 shows the track format.

Next, an example of a system configuration for realizing the data recording/reproducing method of the present invention will be described with reference to FIGS. 3 to 5. That is, (1) in the figure is R-D for audio.
The mechanism has the same structure as an AT, and the mechanism (1) is equipped with a rotating cylinder, a capstan motor, a reel motor, etc. (2) is 180 mm for the rotating cylinder.
° Two recording/reproducing rotary heads (A, B) placed apart.
The recording/reproducing amplifier (3) that sends and receives recording and reproduction signals to and from the head) adds an error correction code to the recorded signal, performs interleaving, etc. during recording in units of one frame, and performs error correction and error correction on the reproduction signal during reproduction. (4) is an intra-frame signal processing circuit that performs de-interleaving, etc.; (4) is an in-sector signal processing circuit that adds an error correction code and performs interleaving, etc. during recording in units of sectors; and performs error correction, de-interleaving, etc. during playback; The internal signal processing circuit (4) is constructed as shown in FIG. In other words, (5) is an error correction circuit that adds an error correction code to each sector at the time of recording and performs error correction during playback, and (6) and (7) are the error correction circuits that add error correction codes to each sector at the time of recording and perform error correction during playback. The first and second sector memories temporarily store data in sector units, and the programs and digital data played from the tape during playback (loading) are temporarily stored in sector units. The data stored in the sector memory (6) is transferred to the error correction circuit (5).
This is done while the intra-frame signal processing circuit (3) is fully supplied with the error correction code added, and data storage/reading is performed alternately in both sector memories (6) and (7). It turns out. (8) is the first and second sector memory (6) under control from the system control circuit described later.
(7), a control circuit that controls the error correction circuit (5), which interleaves the data stored in the first and second sector memories (6) and (7) in sector units during recording, and also interleaves the data stored in the first and second sector memories (6) and (7) An error correction code is added to the data read from the sector memories (6) and (7) in sector units, and during playback, the data is stored in the first and second sector memories (6) and (7).
Data that has been previously stored and subjected to error correction by the error correction circuit (5) is subjected to de-interleaving on a sector-by-sector basis. (9) was placed with a step at a position 90° behind the A and B heads, respectively, so that the track traced by the two A and B heads during recording could be retraced and recording monitored. A playback amplifier that receives playback signals from two playback-only rotary heads (heads A' and B'), and (10) indicates that the sector has been recorded each time the monitoring of one sector unit is completed during recording monitoring. At the same time as outputting a signal for each 1'MIt bit, error checking of the monitor signal is performed using the error correction method used in the intra-frame signal processing circuit (3). (4) is a recording error check circuit which outputs a 1-bit second identification signal when the correction capability of the error correction circuit (5) is exceeded; (11) is a cylinder servo circuit that drives and controls the rotating cylinder;
2) is a reel servo circuit that drives and controls the reel motor;
(13) is a capstan servo circuit that drives and controls the Kihebustan motor, and (14) is an A from the output of the recording/playback amplifier (2) through the intra-frame signal processing circuit (3) during playback.
The ATF circuit extracts signals in the TF region to generate a tracking error signal, and this error signal is supplied to the capstan servo circuit (13) and used to control the rotational speed of the capstan motor. (15) is a subcode processing circuit that extracts the signal of the subcode area from the output of the recording/playback amplifier (2) through the intra-frame signal processing circuit (3) during playback, and (16) is the subcode processing circuit that uses various operating keys manually and subcode processing. circuit(
15) or from the command circuit described later, the sector signal processing circuit (4), the frame signal processing circuit (3), the cylinder servo circuit (11), the reel servo circuit (12), and the capstan servo. Circuit (13)
This is a system control circuit that controls the And (17)
is an input/output device that serves as an input/output terminal to the host computer, and (18) is a command circuit that gives commands to the system control circuit (16) in response to commands from the host computer through this input/output device (17). The command circuit (18
) is constructed as shown in FIG.

That is, (19) is a class memory in which the number of tape divisions that can be specified according to the tape type and the number of FG pulse counts of the reel motor from the tape starting edge indicating the time of each division are stored in advance, and (20) is A sector memory that can store the first identification signal indicating which sector in the data area of the class in which data is currently being recorded.
), the 1-bit first identification signal sent to each sector through the intra-sector signal processing circuit (4) is stored in a matrix as shown in Figure 6, and is stored in the data area. The map for sector management is hereinafter referred to as a sector map. Here, in this map, the horizontal address is given by 3 bits, the vertical address is given by 12 bits, and the sector order of the data area is given by address 0000.
00000000(7)000,001-57) (that is, one bit corresponds to one sector), where "rl" represents a recorded sector and rO4 represents an unrecorded sector. Therefore, in this figure, 27 sectors from the first sector are recorded. (
21) is a BAD sector memory in which a second identification signal indicating which sector in the data area of the class in which data is currently being recorded cannot be recorded or reproduced; The 1-bit second identification signal sent from the error check circuit (lO) to each sector through the intra-sector signal processing circuit (4) is stored in a matrix as shown in FIG. This map is hereinafter referred to as a BAD sector map as a map for managing AD sectors that cannot be recorded or reproduced in the data area. Here, this BAD sector map has its addresses given in the same way as the sector map, and the sector order of the data area is set to address 0.
It corresponds to the neck of 000.001... of 000ooooo oooo (that is, 1 bit...l corresponds to 1 sector), and 11'' represents a sector where recording and playback is not possible. "0" indicates that the sector is recordable and reproducible. Therefore, in this figure, when 27 sectors from the first sector are recorded, 4 of them become unrecordable and reproducible. The host computer is notified from the input/output device (17) through the control circuit, and a message indicating that this class has become difficult to use is displayed to call the user's attention. Also, if the number increases further, recording to that class will be forcibly stopped. (
22) is a TOC memory in which TOOff information that has been completely recorded in the TOC area of the class in which data is currently being recorded/played is temporarily stored, and (23) is sent from the host computer at the time of recording (save). A data buffer memory temporarily stores programs and digital data that are played back from a tape during playback (loading), and (24) is a command decoding memory that decodes commands from the host computer and outputs them to the control circuit described later. The circuit (25) receives the output from the instruction decoding circuit (24) and outputs a class memory (19), a sector memory (20),
BAD sector memory (21), ToC memory (22),
Data back memory (23), system control circuit (16)
) is a control circuit that controls the

Next, an example of how each map is used when recording an example of such a system configuration will be described. First, when a program save command is issued by operating the keyboard on the host computer side, the save command is sent to the control circuit (25) and the system through the input/output device (17) and the command decoding circuit (24) in the command circuit (18). It is transmitted to the control circuit (16) and R-
When the DAT mechanism is set to the recording state, the program sent from the host computer through the input/output device (17) and stored in the -1 data buffer memory (23) is transferred to the intra-sector signal processing circuit (4). Control circuit (
25), the first sector memory (
After being stored in 6), an error correction code is added and supplied from the control circuit (8) to the A and B heads via the intra-frame signal processing circuit (3) and the recording/reproducing amplifier (2), and the data is stored on the tape in sectors one track at a time. Then, when recording the first sector, there is a 90° delay <7)A'
, B' head performs recording monitoring for each track recording, and the monitor output is sent to the playback amplifier (
9) to the recording error check circuit (10), and the error check is completed for each track. When the recording of the first sector is completed, the program of the second sector stored during the recording of the first sector is transferred from the second sector memory (7) to the control circuit (8).
The signal is supplied to the A and B heads through the intra-frame signal processing circuit (3) and the recording/reproducing amplifier (2), and the second sector is recorded on the tape as shown in FIG.

After the recording of this second sector starts, the number of intra-sector errors in the first sector checked by the recording error check circuit (10) is determined by the intra-sector signal processing circuit (4).
If it is determined that the error does not exceed the correction capability of the error correction circuit (5), the recording error check circuit (10)
A second identification signal of "0" is output together with a first identification signal of "1.", and is sent to the command circuit (18) through the control circuit (8).
sector memory (20) and BAD sector memory (21)
). Therefore, sector memory (2
0), address '000000000001J'ooo' is fully recorded with '1', and BAD sector memory (
21) has the address 'ooo.

00000001, "0" is stored in "000". At the same time, the second identification signal 9 of "0.
The numbers are control circuit (8), in-frame signal processing port (3),
It is supplied to the A and B heads through the recording/playback amplifier (2).
It is recorded as a BAD mark in the subcode area of each track in the sector.

When the recording of the second sector is completed, the program of the third sector stored during the recording of the second sector is transferred from the first sector memory (6) to the control circuit <8> and the intra-frame signal processing circuit. (3) The signal is supplied to the A and B heads through the recording/reproducing amplifier (2), and the third sector will be recorded on the tape, and it is determined that the number of errors in the monitor signal does not exceed the correction capability. Similarly, the next address '0000000' is stored in the sector memory (20).
00001J'001. "1" is recorded in BAD
Also the next address r 00000 in sector memory (21)
0000001. '0' is recorded in '0OIJ, and 3
"0" is recorded in the subcode area of each track in the sector. When the recording of the third sector is completed, the program of the fourth sector stored during the recording of the third sector is transferred from the second sector memory (7) to the control circuit (8) and the intra-frame signal processing circuit. (4) The signal is supplied to the A and B heads through the recording/reproducing amplifier <3>, and the fourth sector is recorded on the tape. After the recording of the fourth sector starts, if it is determined that the number of intra-sector errors in the third sector, which has been successfully checked by the recording error check circuit (10), exceeds the correction capability of the error correction circuit (5). , Similarly, the next address '000000000001.' is stored in the sector memory (20). '0IOJ
r I J is recorded in BAD sector memory (21)
has the following address '000000000001'
0IOJ will be recorded.At the same time, rl will be recorded in the subcode area of each trunk in the 4th sector, and the program in the 5th sector will be stored in the 1st sector memory (6). The program in the 3rd sector will continue to be stored.
When the recording of the 3rd sector is completed, the program of the 3rd sector is supplied from the 1st sector memory (6) to the A and B heads in the same way, and the recording of the 3rd sector is performed again on the tape. When it is determined that the number of errors in the sector of the monitor signal of the fourth sector does not exceed the correction capability, the next address r is stored in the sector memory (20).
ooooooooo.

0001 J'011. "1" is recorded in BAD
The next address 'oooo' is also stored in sector memory (21).
ooooo.

'0' will be recorded in '011' of 0001J, but '1.' will be recorded in the subcode area of each track in the third sector. Even if the number of errors in the sector does not exceed the correction capacity, rl will be recorded in the sub-food area of the third sector because it will be re-recorded when the program is played back (save). This is to prevent the order of the sectors from changing back and forth, and the reproduction program of the sector marked with "BAD mark 11" is discarded by the control circuit (8), and only the reproduction program of the sector marked with "OJ" is de-interleaved. are stored alternately in the first and second sector memories (6) and (7).Then, from then on, the number of errors in the sector of the monitor signal during recording will exceed the correction ability of the error correction circuit (5). As long as it does not exceed
Each sector is sequentially recorded, and "rO" is recorded in its subcode area, "1" is recorded in the sector memory (20), and "OJ" is sequentially recorded in the BAD sector memory (21). Become.

In addition, when the recording of the last E-sector of one program is finished, recording of the E-sector program is started again in the next sector until the E-sector monitor error check is completed. As a result of the monitor error check, if it is determined that the number of errors in the sector does not exceed the correction capability, recording will be stopped midway, and the sector memory (20) will display that up to sector E has been recorded. .

On the other hand, if it is determined as a result of the monitor error check that the number of errors in the sector exceeds the correction capability, recording is continued and a BAD mark of "1" is recorded in the subcode area from that point on.

Next, the data area of such a class is 27 from the first sector.
For example, if sectors 10 to 16 are erased in a state where up to the sector is recorded (see FIG. 6), the sector memory (20) will store the address '000000000001.' corresponding to each sector. '001. from"
Up to 111J will be re-recorded in "rO" as shown in Figure 9 (however, in the BAD sector memory (21) "
Sectors in which "1" is recorded remain "1").

Therefore, when recording a new program, sector memory (2
By searching the sector map in 0), you can easily find out which sectors in the data area are recorded or cannot be recorded or reproduced, and where unrecorded sectors caused by erasure are located and their capacity. For example, when a command to record a new program is issued from the host computer, the steps from step (26) to step (27) in FIG. Proceed to compare the sector size (number of sectors) of the program included in this instruction and the continuous free area (number of unrecorded sectors) in the sector memory (20), and determine the sector size of the program that can newly record the free area. If it is determined that it is equal to or greater than
) starts recording a new program in the sector on the tape corresponding to the empty area display, and accordingly, 11'' are sequentially recorded in the empty area in the sector memory (20). When the recording of the new program is completed, the process proceeds to step (29>) and the instruction ends.If no free space larger than the sector size of the new program is found in step (27), step (29) is completed.
Proceed to step 3o) to notify the host computer,
The instruction to move to a data area of another class is displayed and the instruction in step (29) ends.

(G) Effects of the Invention According to the data recording and reproducing method of the present invention described above, it is possible to manage programs and digital data for each class, and when recording new programs and digital data, it is possible to control which part of the tape To easily know where the recordable part is located and its capacity due to the completion of recording and partial erasure after recording, and which part of the tape is in a state where recording and playback is impossible. Therefore, the responsiveness and efficiency of data recording and reproduction using tape can be improved.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 shows the division form of a 120-minute tape, Fig. 2 shows its track format, Fig. 3 shows an example of its system configuration, and Fig. 4 shows an example of the system configuration. The figure shows a specific configuration example of the signal processing circuit in the sector, FIG. 5 shows the specific configuration example of the command circuit, FIG. 6 shows the sector map, and FIG. 7 shows the BAD.
FIG. 8 is a diagram showing a sector map, FIG. 8 is a diagram showing an example of file recording, FIG. 9 is a diagram showing a sector map when partial erasure is performed, and FIG. 10 is a flowchart. (4)...intra-sector signal processing circuit, (6)(7)...
- First and second sector memories, (16)...system control circuit, (18)...command circuit, (20)...sector memory, (21)...BAD sector memory.

Claims (1)

[Claims] (1) A data area and a catalog area for recording a list of programs and digital data recorded in the data area are formed on the tape that is helically scanned by a rotating head, and the program and digital data to this data area are recorded. This is a rotary head tape recorder in which recording is performed in sector units, with two tracks as one frame and multiple frames as one sector. an identification signal;
A data recording/reproducing method for a rotary head type tape recorder, characterized in that a second identification signal indicating that a sector in a data area is in a recording/reproducing disabled state is recorded.