JPH0194568A - Data recorder - Google Patents

Abstract

PURPOSE:To shorten the retrieval time of data and make data editing easy by equipping with a second mode to record repeatedly address data to show a tape address many times onto respective tracks by a revolving head. CONSTITUTION:The title device has the second mode to form many parallel tracks on second areas a1 and a3 existing extendedly in the longitudinal direction of a tape-shaped recording medium T in parallel with a first area and at the same time, to record the address data to show the tape address onto the respective tracks many times repeatedly by a revolving head H1. Consequently, revolving heads H1 and H2 cross obliquely the respective tracks of the second areas a1 and a3 in the condition of running the tape-shaped recording medium T at high speed but since the address data are repeatedly recorded onto the second areas a1 and a3, the address data can be obtained from every part of the tracks. Thus, even when the tape-shaped recording medium T is run at high speed, the address data can be surely reproduced and a retrieval speed increases. Since the address data recorded on the second areas a1 and a3 can be used as the absolute address of the tape-shaped recording medium T, the editing of the data becomes easier.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recording device, and particularly to a data recording device that records data on a tape-shaped recording medium using a rotary head.

[Conventional technology]

Data recorders for recording and reproducing digital data include those that use a disk-shaped recording medium such as a floppy disk, and those that use a tape-shaped recording medium. −
For consumer equipment that does not require recording large amounts of data for boat fishing, data recorders using disk-shaped recording media that allow easy data retrieval are mainly used, and for businesses that handle large amounts of data. A data recorder using a tape-shaped recording medium is mainly used as a data recorder.

A data recorder used as a data bank for a large computer is of a type that uses a fixed head to record on a tape-shaped recording medium.

On the other hand, in recent years, opportunities to handle large amounts of data such as image information have increased, and data recorders capable of handling large amounts of data have become necessary even in consumer devices. The data recorder using the fixed head is not suitable as a consumer device because it uses a large amount of tape and the device is large.

Therefore, recently, a compact data recorder for consumer use has been proposed that records and reproduces data on a tape-shaped recording medium using a rotary head.

[Problem that the invention seeks to solve]

However, this type of rotary head type data recorder has the following problems. First, since a tape-shaped recording medium is used, it takes a very long time to access the tape to later pick up desired data. Furthermore, since there is no absolute address, desired data cannot be freely erased or rewritten. That is, it is difficult to edit the data.

Therefore, it has been considered to mix and record sub-data (hereinafter referred to as ID) as data for various searches with the main data recorded by the rotary head. However, it is difficult to detect desired search data while running the tape at high speed, and on the other hand, if the tape running speed is reduced, the search will take a long time. Also, editing the data is still difficult.

The present invention has been made in view of the above-mentioned background, and is a data recording device that allows recorded data to be searched in a short time and data can be easily edited, and which is compact and capable of handling large amounts of data. The purpose is to provide something.

[Means for solving problems]

For this purpose, according to the present invention, a large number of parallel tracks are formed on a first area extending in the longitudinal direction of a tape-shaped recording medium, and data related to main information is recorded using a rotating head. In a first mode, a large number of parallel tracks are formed in a second area extending in the longitudinal direction of the medium in parallel with the first area, and address data indicating a tape address is transmitted to each track. A data recording device is presented which has a second mode in which recording is performed with a rotary head repeatedly over a large number of times.

[For production]

According to the above configuration, the rotary head diagonally crosses each track in the second area while the tape-shaped recording medium is running at high speed, but address data is repeatedly recorded in the second area. Since the address data can be obtained from any part of the track, the address data can be reliably reproduced even when the tape-shaped recording medium is running at high speed, and the search speed is greatly increased. Also the second
The address data recorded in the area can be used as an absolute address on the tape-shaped recording medium, making it easier to edit the data.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Description of Configuration) FIG. 2 is a diagram showing a schematic configuration of an embodiment of the present invention,
In the figure, reference numeral 11 denotes a terminal to which an analog video signal obtained from a camera or the like (not shown) is input, and in the data recorder of this embodiment, this analog video signal is converted into digital data and recorded and reproduced. 12 is an analog connector for digitizing the analog video signal input to the terminal 11;
A digital (A/D) converter; 13, a field memory capable of storing one field of a digitized video signal; 14, an address control circuit for controlling writing and successive addresses in the field memory 13; 15, a control circuit; Data other than video data such as data and character data (hereinafter referred to as ID
This is a D-ID processing circuit that forms and outputs a D-ID.

In the data recorder of this embodiment, there are two types of IDs: an ID recorded together with video data and an ID recorded in a subcode area, which will be described later.The former is the D-ID, and the latter is the 5-I.
It is called D.

16 is a PCM that performs interleave processing and adds redundant codes such as error detection codes and error correction codes to video data and ID, and then outputs it as PCM data.
A processor 17 is a P output from the PCM processor 16.
A modulator 18 is a recording amplifier that digitally modulates CM data.

In addition, 21 is a reproducing amplifier, 22 is a demodulator corresponding to the modulator 17, and 23 is an error detection code and an error correction code in the PCM data obtained through the demodulator 22. an error detection circuit that detects
24 is a system controller that controls the entire device; 25
is a PCM processor 2 that performs the opposite processing to that of the PCM processor 16, that is, deinterleave processing and error correction processing;
6 is an I that outputs various control data and data other than video data based on the ID obtained from the PCM processor 25;
D processing circuit; 27 is a field memory that receives video data output from the PCM processor 25; 28 is an address control circuit that controls write and read addresses of the field memory 27; 29 is digital video data read from the field memory 27; A digital-to-analog (D/A) converter 30 is an output terminal for analog video signals.

H1 and H2 are rotating heads, and their arrangement will be explained with reference to FIGS. 3(A) and 3(B). Figure 3 (A)
As shown in FIG. Wrapped.Head H1
is used for data recording, and the head H2 is used for data reproduction.As shown in FIG. 3(B), the heads H1 and H2 have the same azimuth, and have different rotations by a predetermined distance X in the direction of the rotation axis. Rotate on the surface. This distance X is
If recording is performed only by head H1 and the track length is sufficiently small compared to the recording track pitch, then
It is expressed as a percentage of the recording track pitch. As a result, the head H2 traces the trace locus of the head H1.

In addition, in FIG. 2, 31 is a cylinder phase detector that detects the rotational phase of the cylinder 50 and outputs a pulse (hereinafter referred to as PG pulse) synchronized with this, and 32 is a gate circuit that receives the PG pulse. 33.34.36.37 timing controller for controlling gate timing, 35
38 is a 5-ID processing circuit that generates a 5-ID to be recorded in a sub-code area, which will be described later.
.

5-ID processing circuit for restoring information; 40 is an operation unit operated by a user; and 41 is a capstan control circuit for controlling conveyance of the tape T.

(Outline of Operation) Here, an outline of the operation of the data recorder of this embodiment will be explained.

FIG. 4 is a diagram showing the recording format on the tape T by the data recorder of this embodiment. In the data recorder of this embodiment, 5-ID is first recorded in the subcode areas al and a3 on the tape T in FIG. 4 by the head H1. This 5-ID includes address data indicating the tape address, and the subcode area al,
By recording the 5-ID on a3, the absolute tape address in the longitudinal direction of the tape T can be defined. (Hereinafter, this operation will be referred to as formatting.) When recording main data on a tape T that has been formatted, video data as main data is After setting the recording position using the address data in the subcode area al.

It will be recorded in main area a2 located between a3 and a3. Here, the running direction of the j-button T during recording of video data is the direction shown by arrow Y, and its transport speed is a certain predetermined speed ν. stipulated in

On the other hand, the transport direction of the tape T when recording 5-ID in the subcode area a3 is similarly the direction shown by the arrow Y.
The conveyance speed is ν. It is assumed to be several times to more than ten times (n times). Further, the conveyance direction of the tape T when recording 5-ID in the subcode area a1 is the opposite direction to the direction shown by the arrow Y, and the conveyance speed is ν. It is assumed to be several times to more than ten times (m times).

Of course, when reproducing the tape, the 5-ID recorded on the tape T is of course used to search for data.

FIG. 5 is a diagram for explaining the data recorded by the data recorder of this embodiment, FIG. 5(a) is the data recorded in the main area a2, and FIG. 5(b) is the data recorded in the subcode area. The data recorded in al and 'a3 are shown respectively.

In FIG. 5(a), D-ID, . . . are synchronization bits for D-ID, and D-ID is the aforementioned D-ID.

CRCC is a redundant code using a cyclic code for error detection, D
ATA... . is a synchronization bit for main data, DATA is main data, and the data string shown in FIG. 5(a) constitutes one data block. Several hundred data blocks are recorded in each track on the main area a2. The data amount of one data block is set to about several bytes for D-ID and about several tens of bytes for DATA. Furthermore, several tens of bytes of DATA include a parity word which is a redundant code for error correction. This parity word is an error correction code (FC) obtained by shattering several data blocks worth of data.
C) formed based on the data matrix for addition, and the fifth
It is distributed within DATA in figure (a).

Also, 5-ID in FIG. 5(b). is 5-ID
It is a synchronization pid for 5-ID, and constitutes one data group together with 5-ID and CRCC. Subcode area al, a
This data group is repeatedly recorded several hundred times on each track on 3.

The details of the operation of the data recorder of this embodiment will be explained below.

(Recording operation in subcode area) FIG. 1 is a flowchart for explaining the operation of the system controller 24 when recording 5-ID in subcode areas al and a3. explain.

In the operation section 4 of FIG. 2, subcode areas al, a3
When the recorder is commanded to record (formatting) the 5-ID, the recorder executes the following formatting operation. First, the system controller 24 sets 0 to variables T and A (step 301), and then sets the frequency of the master clock that regulates the operations of the 5-ID processing circuit 35, modulation circuit 17, etc. (step 302). The frequency of this master crotch is determined when recording main data, which will be described later.
Tape transport speed during playback, tape address search, etc.
5-Head H1 due to difference in tape transport speed during ID recording
, H2 and the tape T to prevent the reproduced clock frequency from changing due to the difference in relative speed between the tape T and the tape T. In this embodiment, the rotational speed of the cylinder 50 is constant in any mode, and the frequency of the master clock is set to match the recording wavelength of the master clock on the tape T during main data recording.

Here, a specific example will be given regarding the frequency of this master clock.

Tape T is usually υ. The inclination φ of the recording track with respect to the longitudinal direction of the tape T when the tape is transported at is 4.90°,
Relative speed V between the head and the tape T when the tape T is stopped. 380.00 (cm/min
Table 1 shows how the frequency f of the master clock changes with respect to the change in the tape speed υ when t e ). In Table 1, V is the relative speed between tape T and heads H1 and H2, and φ is head H1 and H2 relative to the longitudinal direction of tape T.
The slopes of H2 in the trace direction are shown respectively.

Table 1: Relationship between tape speed and master clock frequency 5-Since the ID is first recorded in the subcode area a3, the timing controller 32 adjusts the gate timing of the gate circuit 34 to the timing when the head H1 traces the area a3. Set and other gate circuits 33, 37.38
(step 303).

Then, the tape T is moved through the capstan control circuit 4'1 in the direction of arrow Y. (Step 30)
4) The 5-ID processing circuit 35 starts generating data according to the format shown in FIG. 5(b), and starts recording the 5-ID (step 305).

Here, the variable T mentioned above is recorded as the track number of the subcode area, and the variable A is recorded as address data indicating the tape address. For example, suppose you want to change the tape address to a recording layer of 1 second during normal recording, and cylinder 5
0 is 3600 revolutions per minute and n=10, subcode area a3 is transferred while tape T is conveyed by one address.
This means that it is a book. Therefore, each time the cylinder 50 rotates once (step 306), 1 is added to T. Step 3
07), when T becomes a multiple of i, that is, Tffi. 61
When becomes 0 (step 308), 1 is added to A. j is a constant set depending on the recordable time of the tape T; for example, if the tape T is υ. If the length is conveyed from the starting end to the ending end in 30 minutes when running at the speed of
is set to 1800 or less. Generally, it is set to about 1,500 with some margin.

In steps 306 to 310, A and T are counted up, and when A=j is reached (step 310), the capstan control circuit 41 stops the conveyance of the tape T,
5-ID recording is stopped (step 311). Next, the 5-ID is recorded in the subcode area a1. First, as in step 313, the master crotter is set according to Table 1 (step 313), and the gate timing of the gate circuit 34 is adjusted to the head H1. is set at a timing to trace over area a1 (step 314
). Then, the capstan control circuit 41 moves the tape T in the direction opposite to the arrow Y in FIG. 4 mυ. At step 315), recording of the 5-ID is started in the same manner as in step 305.

This time, T is counted down for each revolution of the cylinder (step 317) and To is reached (step 318). , i becomes 0 (step 319), A is counted down (step 320).

After the S-ID is recorded until A becomes O (step 321), the conveyance of the tape T is stopped, and 5-
Recording of the ID is stopped (step 322), and the operation ends.

(Search operation) Fig. 6 shows the system shown in Fig. 2 when transporting (searching) the tape to a desired position using the 5-ID, or more specifically address data A, recorded in subcode area a1 or a3. This is a flowchart showing the operation of the controller 24, and the search operation will be explained below based on this flowchart.

When a search command is issued by the operation unit 40, the system controller 24 causes the timing controller 32 to set the gate timing of the gate 37 to the timing at which the head H2 traces the area a3, and the demodulation circuits 22 and 5-5 in accordance with Table 1. The frequency of the master clock of the ID processing circuit 38 is determined (step 401). Next, attach the capstan and tape T. 5-ID processing circuit 3 is fed in the direction shown by arrow Y in FIG. 4 (step 402).
8 starts playing the 5-ID (step 403).
.

Now, assuming that the desired tape address set by the operation unit 40 is Ax, the address data A reproduced via the 5-ID processing circuit 38 in step 404 is (Ax-1
) is determined. If A is not (Ax-1), it is determined in step 405 whether A is greater than (Ax-1).

When A is larger than (Ax-1), in step 408, the timing controller 32 sets the gate timing of the gate circuit 37 to the timing when the head H2 traces the area a1, and the frequency of the master clock is adjusted to match the tape transport during the search. Set according to speed (see Table 1).

Then, the capstan is attached and the tape is conveyed at high speed (qυ.) in the direction opposite to the arrow Y in Fig. 4 (negative direction) (Step 4).
09). On the other hand, if A is smaller than (Ax-1), the gate timing of the gate circuit 37 is not changed, the frequency of the master clock is set with reference to FIG. 1 (step 406), the capstan is attached, and the tape T is Figure 4 Arrow Y
(step 407).

When the tape is running at a sufficiently high speed in steps 407 and 409, the head H2 can trace across the tracks on the area a3 or the area al. Note that this speed (pυ., qυ0) will be explained in detail later.

If the head H2 can cross the tracks on area a3 or area a1, the data groups shown in FIG. can be picked up, and address data A can be obtained via the 5-ID processing circuit 38.However, if the angular difference between the trace locus during recording and the trace locus during playback becomes large, the 5-ID There is a possibility that one data group cannot be completely reproduced. Therefore, in the data recorder of this embodiment, when the tape is run at high speed in the forward direction as described above, the data is recorded in area a3. 5-ID is played back from the track, and when the tape is run at high speed in the negative direction, the 5-ID is played back from the track recorded in area a1.
Since the 5-ID is reproduced, the inclinations of the trace trajectories of the head are relatively similar during recording and reproduction, the data group can be sufficiently restored, and the 5-ID can be reliably reproduced.

During the above-mentioned high-speed search operation, the reproduced address data A
When becomes (Ax-1) (step 410), the head H2 adjusts the gate timing of the gate circuit 37 to the area a3.
Set the timing to trace, and set the frequency of the master crotch to υ of the tape T. In step 411), the tape T is transported at a speed υ in the forward direction. (step 412).

When the reproduced address data A matches the desired address Ax (step 413
), the transport of the tape T is stopped, the reproduction of the 5-ID is stopped (step 414), and the operation ends.

As a result, the tape T is stopped in a state where the head H2 can trace the track with the smallest track number T among the tracks whose tape address is Ax. Thereafter, by performing a main data recording operation or a main data reproducing operation, which will be described later, it is possible to record and reproduce main data from the beginning of the desired tape address. Further, if the configuration includes a rotating erasing head and the erasing current is supplied only at the timing when the rotating erasing head traces the area a2, it becomes possible to erase the main data at a predetermined tape address.

Next, the transport speed of the tape T during high-speed retrieval will be explained using FIG. 7. In FIG. 7, T is a magnetic tape, and the line segment PL-Ql is indicated by a broken line.

P2-Q2. ..., pH-Qll are line segments parallel to the tracing direction of the rotary head when the tape T is stopped. The distance between these line segments in the tape longitudinal direction is the velocity υ. This corresponds to the length of the tape that moves during the rotation period of the rotary head H1 (during the track formation period) when the tape T moves. Furthermore, the lengths of these line segments correspond to the distance that the rotary head moves while the tape T is stopped. Therefore, points Pi, P2 on the virtual line E
゜..., Pll and the point Ql on the virtual line E', Q2.・・・
・.

Qll is the same point.

Now, since the rotating head traces from the bottom to the top in the diagram, the tape moves in the positive direction υ. When the head is running, the center of the trace trajectory of the head is between points PK and
It is on the line segment connecting (K-k), and the interval therebetween is twice the interval between the broken lines. The solid line on area a2 indicates the center of the trace locus of the rotary head during normal recording and reproduction, and the solid line on area al indicates the center of the trace locus when the tape transport speed during 5-ID recording is set to 4υ0 in the negative direction. , the solid line on area a3 indicates the tape transport speed during 5-ID recording by 4υ in the positive direction. It shows the center of the trace trajectory when .

By the way, during a high-speed search, if the center line of one of the tracks in the area a1 intersects with the center of the trace locus of the rotary head, the 5-ID can be reliably extracted. This also applies to the tracks on area a3.

In other words, in order to reliably extract 5-ID from the track on the area al, the trace locus of the center of the rotating head should be the line segment X2-X.
Either the tape is transported at a higher speed in the positive direction than the transport speed of 3, or the trace locus at the center of the rotating head is
The tape may be run at a higher speed in the negative direction than the conveying speed of -X4. Also, from the track on area a3,
- To reliably extract the ID, either transport the tape at a higher speed in the positive direction than the transport speed at which the trace locus at the center of the rotating head is line segment Y2-Y3, or It is sufficient to transport the tape at a higher speed in the negative direction than the transport speed of −X4.

As shown in FIG. 7, the tape transport speed during recording to area a1 is 4υ in the negative direction. , if the tape transport speed when recording to area a3 is set to 4υ0 in the positive direction, and areas al and a3 are traversed while the rotary head rotates 30 degrees, in order to extract 5-ID from area a1, 44 for direction (
=4x360/3O-4)υ. Above, in the negative direction, 52 (=4X360/30+4)υ. It must be transported at a speed greater than or equal to the above speed. Similarly, from area a3 to 5-ID
In order to extract 52υ in the positive direction. Above, 48υ in the negative direction. It must be transported at a speed greater than or equal to the above speed. However, in the data recorder of this embodiment, the tape is conveyed in the negative direction when reproducing area a1, and in the positive direction when reproducing area a3, so in both cases the tape is conveyed in the negative direction. It must be more than that.

This is shown in - boat fishing. Now, the time required to form one track for recording SiD is τ1, and the track formation period is τ.
, ,5-If the tape transport speed during ID recording is υ8, the transport speed during retrieval υ7 is (
τ, /τ1+1)08 or more, for the opposite direction, (τ2/
τ1-1) must be equal to or greater than 08. However, considering that reproduction can generally be performed if more than half of the head width covers the track, assuming that the head width is the HW% area al and the track pitch of a3 is T, the transport speed υ7 during search is the same as during recording. For the direction (τ2/r + +1)
(TP HW ) υ, /T, and in the reverse direction, (τ, /rt-1) (T, -Hw) υx / 'r-.

In the above embodiment, if the head width H, is 3/4 of the track pitch of area a2, then υ, > (360/30+1) for both area a1 and area a3.
(4-3/4)4υ. /4=169υ. /4;42
．． 25υ.

Therefore, if the tape is transported at a tape transport speed approximately 45 times the normal recording speed, it is possible to reproduce 5-ID during high-speed retrieval.

(Main data recording operation) Next, the main data recording operation of this embodiment will be explained.

Figure 8 shows the system controller 2 during data recording.
8 is a flowchart showing the operation in step 4, and the operation at the time of data recording will be described below with reference to the flowchart in FIG.

One field of digital video data output from the A/D converter 12 is written into the field memory 13 in accordance with the operation of an operation member (not shown). Since the bit rate of digital data obtained by digitizing a video signal in real time is extremely high, the field memory 13 outputs one field's worth of video data, ie, still image data, at a reduced bit rate. Accordingly, this one field's worth of video data is recorded over a large number of tracks on area a2.

In step 101 of FIG. 8, a D-ID is set by the D-ID processing circuit 15, and this D-ID contains the data recorded on which track of one field's worth of video data. Contains track number data indicating whether there is a track. When the recording head H1 reaches a predetermined rotational phase and enters the area a2, the gate 34 starts gating the recording signal, and the head H1 records data for one track (step 102). This recording ends when the drum 50 rotates θ2', and the drum 50 further rotates (
180-02) At 0 rotation, the gate circuit 36 starts gating the demodulated signal, and the playback head H2 has reached the beginning of the track just recorded in the main area a2, and the playback head H2 starts to record this track. Play (step 103
).

The playback signal from the playback head H2 is input to the demodulator 22 via the recording amplifier 21, and the error detection circuit 23 uses the error correction code output from the demodulator 22 to detect the number of data errors, the occurrence pattern, etc. Detected. At this time, if it is determined in step 104 that no data error has occurred, part of the ID such as track number data is updated (step 105), and the data to be recorded next is loaded from the field memory 13 to the PCM processor 16. (Step 106). If the data to be recorded is finished, the process based on this flowchart is finished; if the data is not finished, the process returns to step 102 (step 1).
07), new data is recorded on the next track.

On the other hand, when it is determined in step 104 that a data error has occurred, the number of occurrences of data errors is checked in step 108, and the pattern of occurrence of data errors is checked in step 109. Based on these checks, if it is determined in step 110 that error correction is possible, the process returns to step 102 via steps 105 and 106, and new data is similarly recorded on the next track.

If it is determined in step 110 that error correction is impossible, the process returns to step 102 without updating the ID or data, and the same data is recorded again on the next track.

In the process according to the flowchart of FIG. 8, the processing time from the end of regeneration in step 103 to the start of regeneration in step 102 is such that the cylinder 50
Needless to say, the seed is set to be within the period of zero rotation.

As mentioned above, if it is determined by the verification immediately after recording that the recorded data cannot be corrected, the same data will be recorded repeatedly, and the rotation of the drum 50 and the running of the tape T will be stopped. It is possible to record highly reliable data. Therefore, data recording is performed one after another, and highly reliable data can be recorded in a short time.

(Main Data Reproduction Operation) Next, the operation of the system controller 24 when reproducing main data will be described using the flowchart of FIG.

Playback by the playback head H2 is started (step 201
), it is determined in step 20 that data is recorded.
If step 2 is performed, it is determined based on the output of the error detection circuit 23 whether or not a data error has occurred (step 2o3).

When no data error has occurred, the PCM processor 25 deinterleaves the data and outputs it (step 204), and writes it into the field memory 27 according to the address determined based on the reproduction ID. On the other hand, if a data error has occurred, the error detection circuit 23
Based on the detection results, the number of errors occurring is checked (step 205) and the error occurrence pattern is checked (step 206), and in step 207 it is determined whether the error can be corrected. If the error can be corrected, error correction processing is performed in step 208, and then step 204
After the data is deinterleaved, the data is output. On the other hand, if it is determined that the error cannot be corrected,
It can be determined that the data recorded as the same data as this reproduced data is recorded on the next track, and the process returns to step 201 without outputting the data to perform the next step of reproduction. Note that after step 201 ends, the cylinder 50 remains at (360-
θ) Needless to say, it is set to a period of zero rotation.

In the data recorder of the embodiment described above, the tape T
Since the address data indicating the tape address is recorded several hundred times on each track in the subcode areas al and a3 on both sides of the video data recording area a2 above, the address data A cannot be reproduced even if the tape is transported at high speed. Since this can be easily performed, main data can be quickly recorded at a desired tape address, and when main data is to be reproduced, the desired tape address can be easily reached.

Further, since the tape transport speed when recording address data in the M areas al and a3 is set faster than that when recording main data, it is possible to format the tape in a short time.

Furthermore, since the tape transport direction during 5-ID recording is reversed between area a1 and area a3, the maximum tape speed at which a data block can be extracted is maintained no matter which direction the tape is transported when searching for a tape address. can be made even larger.

Since tape formatting can be performed by just making one round trip of the tape, the time required for tape formatting can also be shortened.

Furthermore, the tape transport speed during address search is set to such a speed that the 5-ID can always be reproduced by one revolution of the rotary head, so that it is possible to extract the most detailed address data.

Furthermore, since the frequency of the master clock is adjusted for each tape transport speed, data recorded at any tape transport speed can be reliably reproduced at any tape transport speed.

(Other Embodiments) FIG. 10 is a diagram showing a schematic configuration of a data recorder as another embodiment of the present invention, and FIG. 11(A).

(B) is a diagram for explaining the head configuration and its arrangement of the data recorder of this embodiment, and FIG. 12 is a diagram showing the recording locus on the tape by the data recorder of this embodiment.

Components in FIG. 10 that are the same as those in FIG. 2 are given the same numbers and their explanations will be omitted.

As is clear from FIG. 12, in this embodiment, the tape T is divided into six regions in the width direction, and the regions CH at both ends of the tape T are divided into six regions in the width direction.
I and CH6 are used as S'-ID recording areas, and the remaining four areas are used as main data recording areas.

The head consists of four rotating heads, including a recording head HA,
The HBs have different azimuth angles and rotate with a phase difference of 180°. This makes it possible to perform so-called azimuth overwriting in each area for main data. The reproducing heads HA' and HB' are delayed in rotational phase by 90 degrees with respect to the recording heads HA and HB, respectively, and the distance corresponding to half the track pitch due to azimuthal overwriting (l in Fig. 11 (B)) (shown) rotates on a shifted plane of rotation. As a result, the reproducing heads HA' and HB' trace the tracks formed by the recording heads HA and HB, respectively.

In area CH1, 5-ID recording is performed in the positive direction at a tape transport speed several times the main data recording speed, and in area CH6, 5-ID recording is performed in the negative direction at a tape transport speed several times the data recording speed. will be held.

PCM processor 16a, 161), 1 (3
C.

16d are areas CH2, CH3, and CH3, respectively, when recording main data.
Since the data recorded in CH4 and CH6 are processed separately and simultaneously, the processing time can be longer than when the data is processed by the same processor. Moreover, error detection circuits 23a and 23b
, 23c, and 23d are for separately and simultaneously processing the main data reproduced from areas CH2, CH3, CH4, and CH5 by the heads HA' and HB', and thereby the area where an error has occurred can be defined during verification. . Therefore, if the same data is recorded only in the area where the error has occurred, the recording time can be shortened. PCM processors 25a, 25b, 25c.

25d is also used to separately and simultaneously process the data reproduced from the areas CH2, CH3, CH4 and CH5.

With the configuration of the signal processing system as described above, each area CH2, C
It is possible to record data simultaneously in H3, CH4, and CH5, or to record data only in one or more areas. Also, during reproduction, data can be reproduced only from a desired area.

5- Signal processing during ID recording is performed by the PCM processor 16
Similarly, one of the PCM processors 25a, 25b, 25c, and 25d is used for signal processing during reproduction of the 5-ID.
This is done using one.

The gate circuit 33' gates the signal at the timing when the head HA or the head HB traces the area CHI or the area CHe during 5-ID recording, and when the head HA or the head HB traces the area CH2 to CHe during the main data recording.
Gate the signal at the timing of tracing one or more of 5. Furthermore, the gate circuit 36' gates the signal at the timing when the head HA' or the head HB' traces the area CHI or the area CH6 when reproducing the 5-ID, that is, at the time of searching, and gates the signal at the timing when the head HA' or the head HB' traces the area CHI or the area CH6 when reproducing the main data or verifying. 'or the signal is gated at the timing when the head HB' traces one or more of the areas CH2 to CH5.

Next, considering the tape transport speed during high-speed search according to this embodiment, each area CHI, CH6 has three rotating heads.
Traced during 6° rotation. The track formation period is a period during which the rotary head rotates 180 degrees, but if the azimuth angles are different, data cannot be reproduced, so the period for forming tracks with the same azimuth angle must be referred to. Therefore, τ, /τ is 10, and the tape transport speed when recording 5-ID is 4 of that when recording main data (υ.).
If it is multiplied by 441:=(10+1)4) during recording, a tape transport speed twice as high as the tape transport speed is required when the transport directions are the same. Also, the head width is 1.5 of the main data track pitch.
If the tape transport speed is twice as long and playback can be performed if more than half of the head width covers the track, the required tape transport speed is 27.5 (= (10 + 1)) when the tape transport direction is the same.
4-1, 5) 4/4) υ. That's all for now.

It goes without saying that the data recorder of the above embodiment can provide the same effects as those of the previously described embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, a rotary head type using a tape-shaped recording medium that can quickly search recorded data, record data to a desired tape address, etc., and can easily edit data. A data recording device is obtained.

[Brief explanation of the drawing]

FIG. 1 is a flowchart for explaining the recording operation in the subcode area of a data recorder according to an embodiment of the present invention; FIG. 2 is a diagram showing a schematic configuration of a data recorder according to an embodiment of the present invention; Figures (A) and (B) are diagrams showing the head configuration and arrangement of the data recorder in Figure 2, Figure 4 is a diagram showing the recording format on the tape by the data recorder in Figure 2, and Figure 5 is a diagram showing the head configuration and arrangement of the data recorder in Figure 2. 6 is a flowchart to explain the operation of the data recorder in FIG. 2 when searching for an address. FIG. 7 is a diagram explaining the tape transport speed when searching for an address. Figure 8 is a flowchart for explaining the operation of the data recorder in Figure 2 when recording main data, and Figure 9 is a flowchart for explaining the operation of the data recorder in Figure 2 when reproducing main data. 10 is a diagram showing a schematic configuration of a data recorder according to another embodiment of the present invention, FIGS. 11(A) and (B) are diagrams showing a head configuration and arrangement of the data recorder of FIG. 10, FIG. 12 is a diagram showing a recording format on a tape by the data recorder of FIG. 10. In the figure, Hl, HA, and HB are recording heads, H2, and H, respectively.
A' and HB' are playback heads, T is tape, 16
．． 16 a, 16 b, 16 c, 16
d is a PCM processor, 24 is a system controller, 25. 25 a, 25 b, 25 c
, 25d are PCM processors, 31 are cylinder phase detectors, 32 are timing controllers, 33.34 are gate circuits, 35.38 are 5-ID processing circuits, 36.37 are gate circuits, and 40 is an operation circuit. Part, 4
1 is the capsun control circuit, DATA is the main data, 5-
ID is control data including address data, a2
is the main area as the first area, and al and a3 are the subcode areas as the second area.

Claims (2)

[Claims] (1) A first mode in which data related to main information is recorded using a rotating head while forming a large number of parallel tracks on a first area extending in the longitudinal direction of a tape-shaped recording medium; While forming a large number of parallel tracks in a second area extending in the longitudinal direction of the medium in parallel with the area, address data indicating a tape address is recorded on each track many times using a rotating head. A data recording device having a second mode. (2) In the first mode, the tape-shaped recording medium is conveyed in the longitudinal direction at a predetermined first speed, and in the second mode, the medium is transported at a predetermined first speed. The data recording device according to claim 1, wherein the data recording device is conveyed in its longitudinal direction at a fast second speed.