JP3528877B2 - Magnetic recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus in which three heads scan the same azimuth track so that the signals of the tracks can be reproduced by one scanning of a rotary magnetic head.

[0002]

2. Description of the Related Art A conventional non-tracking recording / reproducing apparatus is, for example, "Nikkei Electronics" 19
92.3.30 (no. 550) p. 133-161
Etc. The outline of this digital recording / reproducing apparatus will be described.

FIG. 13 shows a rotary head device.
Is a tape guide drum, and the magnetic tape 2 is obliquely wound around the tape guide drum 1 in an angular range of about 100 degrees. Further, 3A, 3B and 3A 'are rotary magnetic heads. The heads 3A and 3A 'have the same azimuth, the heads 3A, 3A' and 3B have different azimuths, and the heads 3A and 3B are so-called double azimuth heads.

In such a rotary head device, at the time of recording, the heads 3A and 3B are alternately used for every one rotation, and inclined recording tracks TA and TB are sequentially formed on the magnetic tape 2 as shown in FIG. To be done. In this case, each inclined track TA, TB is formed by supplying a recording signal to the heads 3A, 3B during a 90 ° angular range in which the heads 3A, 3B scan the magnetic tape 2. Then, the signal of one track is divided into a plurality of blocks and recorded, and
A track address and a block address are recorded for each block.

Since the heads 3A 'and 3B are used together for one rotation during reproduction, double density scanning is performed during reproduction even if the rotational speed is the same during recording and during reproduction. Figure 1
4 shows the scanning loci of the heads 3A 'and 3B.

FIG. 15 shows the circuit structure of the reproducing system.
Reproduction signal S output from heads 3A 'and 3B during reproduction
3A and S3B (shown in FIGS. 16A and 16B) are supplied to the fixed terminals on the a side and the b side of the changeover switch 5 via the reproduction amplifiers 4A and 4B, respectively. The changeover switch 5 is a head 3A '.
Is connected to the side a while the magnetic tape 2 is being scanned, while the head 3B is connected to the side b while the magnetic tape 2 is being scanned.

The reproduction signal (shown in FIG. 16C) output from the changeover switch 5 is supplied to the reproduction signal processing circuit 8 via the amplifier 6 and the reproduction equalizer 7. After the reproduced signal is demodulated in the processing circuit 8, the data of each block is sequentially written into a predetermined address of the buffer memory corresponding to the track address and the block address, whereby the signal of each track is obtained. Then, the reproduction data of each track read from the buffer memory is subjected to error correction processing and output.

As described above, the heads 3A 'and 3B scan the recording tracks TA and TB at a double density during reproduction, and the processing circuit 8 reconstructs the signal of each track based on the track address and the block address. Head 3
A'and 3B do not need to faithfully trace (track) the recording tracks TA and TB, respectively.

[0009]

In such a non-tracking type reproducing apparatus, the recorded signal (data) can be recorded even if the recording track is not correctly scanned due to the difference between the recording speed and the reproducing speed. Can be played correctly.

However, since it is non-tracking as is clear from FIG. 14, in order to reproduce all signals from the same azimuth track, the same azimuth head must scan the same track several times. Therefore, it takes a signal processing time when the signal is reproduced from the same track .

In view of the above, the present invention has solved the above-mentioned conventional problems and provides a magnetic recording / reproducing apparatus capable of reproducing all signals recorded on one track by scanning of a rotary head for one rotation. It is a proposal.

[0012]

To solve the problems described above SUMMARY OF THE INVENTION The magnetic recording and reproducing equipment according to the present invention, together with a signal of one track is recorded is divided into a plurality of blocks, each block Record each recording track on the magnetic tape with track address and block address recorded
The track add that is scanned and read at a higher density than
In the magnetic recording / reproducing apparatus for reproducing the signal based on the address and the block address , approximately 18
For a pair of recording / reproducing heads having different azimuths arranged at intervals of 0 °, and for the pair of recording / reproducing heads,
18 ° apart from each other at 90 ° apart on the rotating drum
0 ° and a four <br/> reproducing head was made with double azimuth configured to face, the pair of recording heads in exchange <br/> record the signal on each other to Rutotomoni, signal It is characterized in that during reproduction, signals from the same azimuth track are reproduced by three heads having the same azimuth structure.

[0013]

A signal is alternately recorded without a guard band by a pair of heads having different azimuths 180 ° apart. During reproduction, three heads having the same azimuth scan the tracks recorded with the same azimuth at 90 ° intervals.

Then, even if each of the heads is a non-tracking scan, three heads sequentially scan different positions of the same track in a partially overlapping state, so that the rotary magnetic head makes one rotation only. All signals recorded on the track can be reproduced. The reproduced signal is stored in the buffer memory in the order of addresses by referring to the block address. Therefore, the speed of reading the signal is increased. Since the scanning is partially overlapped, there is no signal missing section, and the reliability is improved accordingly.

[0015]

EXAMPLES Next, an example of the magnetic recording / reproducing apparatus according to the present invention will be described in detail.

FIG. 1 shows a rotary head device in this example. In FIG. 1, parts corresponding to those in FIG. 13 are designated by the same reference numerals, and detailed description thereof will be omitted.

Also in the present invention, the tape winding angle with respect to the tape guide drum 1 is about 100 ° as in the conventional case. In FIG. 1, a pair of recording / reproducing heads AR / W and BR / W having different azimuths are arranged on a rotary drum 13 provided in the tape guide drum 1 at intervals of approximately 180 °. When the azimuth of the recording / reproducing head AR / W is the first azimuth, the second recording / reproducing head BR / W is a head having a second azimuth configuration in which the azimuth directions are opposite and the azimuth angle is the same. Further, the rotary drum 13 is located at a position 90 ° apart from the first and second recording / reproducing heads AR / W and BR / W, and the recording / reproducing head AR / W.
Four reproducing heads AP1 to BP2 having a double azimuth structure are arranged at the same height as W and BR / W.

In FIG. 1, the first recording / reproducing head AR / W
And the clockwise direction is the drum rotation direction, the first and second reproducing heads AP are located at a position 90 ° away from the recording / reproducing head AR / W rotationally ahead.
1, BP1 are arranged. The first and second reproducing heads AP1,
BP1 has a double azimuth structure and is arranged in parallel in the rotational direction as shown in FIG. First reproducing head AP1
Is configured as a first azimuth head like the first recording / reproducing head AR / W, and the second reproducing head BP1 is a second
The second azimuth head is the same as the recording / reproducing head BR / W.

The third and fourth reproduction heads are located at a position approximately 180 ° apart from the first and second reproduction heads AP1 and BP1 and at the same height as these heads AR / W and BR / W. Heads AP2 and BP2 are arranged. These playback heads AP
A double azimuth head in which 2 and BP2 are also arranged in parallel is used, the third reproducing head AP2 is the first azimuth head, and the fourth reproducing head BP2 is the second azimuth head.

When the six heads are arranged at intervals of 90 ° with respect to the rotary drum 13, the first azimuth head has the recording / reproducing head AR / W and the reproducing heads AP1 and AP2 at 90 ° to each other. It will be arranged at an interval of °. Similarly, in the second azimuth head, the recording / reproducing head BR / W and the reproducing heads BP1 and BP2 are arranged at intervals of 90 °. During signal recording, a pair of recording / reproducing heads AR / W and BR / W alternately record signals, and during signal reproducing, all of the six heads AR / W to BP2 are reproduced.

Recording and reproduction of signals when the rotary magnetic head device having the above-described structure is used will be described below. Figure 3
Indicates a recording pattern at the time of recording. During recording, a pair of recording / reproducing heads AR / W and BR / W are used to alternately record signals without a guard band. Ai represents a track when recorded by the first azimuth recording / reproducing head AR / W, and Bi represents a track when recording by the second azimuth recording / reproducing head BR / W.

When reproducing the recording track of FIG. 3, the signal is reproduced by non-tracking scanning. The reproduction mode shown in FIG. 4 shows a scanning locus during reproduction at the same speed as during recording, and shows a case where reproduction is performed with a shift of one track pitch from the actual track. The scanning positions of the heads AR / W, AP1, AP2 for the first azimuth at that time are shown by hatching. However, since these three heads AR / W, AP1, AP2 are separated by 90 °,
As shown in the figure, they are not in contact with the magnetic tape 2 at the same time. It is shown for convenience only.

FIG. 5 shows the relationship between the timing at which the reproduced signal is obtained and the output level during scanning in this way. In the example of FIG. 4 , since the reproducing head AP1 scans almost the center of the track B1, the reproducing output from this point is zero. Since the recording / reproducing head AR / W, which is delayed by 90 ° with respect to the reproducing head AP1, scans the track A2 with a shift of approximately ½ track pitch, the reproduction level becomes ½ of the maximum value. And 90 degrees more than this
Since the delayed reproducing head AP2 scans almost the center of the track A2, its reproducing level becomes the maximum value. In the next rotation, the track A3 is scanned in the same manner this time, so that the signal is reproduced at the timing and level shown in FIG.

Head AR / W, AP for the first azimuth
When the scanning loci of 1 and AP2 are as shown in FIG. 3, the heads BR / W, BP1 and BP2 for the second azimuth scan each track as shown in FIG. The relationship between the reproduction timing and the reproduction output level at that time is as shown in FIG.

In this way, when the data is reproduced at the same speed as that at the time of recording, at least the same azimuth track is scanned twice by one rotation by the head having the same azimuth, though the scanning position is different. Absent.

When the track is scanned at a reproduction speed different from that at the time of recording, the result is as shown in FIG. First, for example, the non-tracking scan when the reproduction speed is faster than the recording time is as shown in FIG. FIG. 8 shows the head AR / of the first azimuth.
The head loci of only W, AP1, and AP2 are shown. In the case of such a reproducing speed, signals are obtained from the respective heads AR / W, AP1 and AP2 at the timings shown in FIG.

Although the reproduction output level is different depending on the timing and width across the track Ai, the head scans a position where the head overlaps at least three times with one rotation of the tape guide drum for the same track. As a result, the rotary drum 1
It is possible to reproduce all the signals recorded on one track Ai by rotating the 3 once. Since the same applies to the heads BR / W, BP1 and BP2 of the second azimuth, the description thereof will be omitted.

FIG. 10 shows an example of non-tracking scanning when the reproduction speed is slower than that during recording. FIG. 11 shows the relationship between the timing and level of the reproduction signal obtained from each head AR / W, AP1, AP2 at that time. Thus, all the signals recorded on one track Bi can be reproduced by rotating the rotary drum 13 once.

FIG. 12 shows a signal processing system provided in the rotary magnetic head device, particularly a reproducing system thereof. Head AR / W,
The signals reproduced from each of AP1 and AP2 are guided to a changeover switch 23 via a preamplifier 21 provided in the rotary drum 13. The changeover switch 23 is controlled so that the respective reproduction signals are selected only while the heads AR / W, AP1 and AP2 are scanning the magnetic tape 2. In the example of FIG. 1, since the tape winding angle is approximately 100 °, the signals are reproduced from the heads with some overlap.

The reproduction signal output from the changeover switch 23 is supplied to the reproduction signal processing circuit 26 via the main amplifier 24 and the reproduction equalizer 25. After the reproduced signal is demodulated in the processing circuit 26, the data of each block is sequentially written into a predetermined address of the buffer memory corresponding to the track address and the block address to obtain the signal of each track. Then, after the reproduction data of each track read from the buffer memory is subjected to error correction processing, it is output in synchronization with the reproduction clock RCKa obtained from the clock generator 37.

The reproduced signals from the other heads BR / W, BP1 and BP2 are similarly preamplifier 31 and changeover switch 3
3 and the main amplifier 34 and the reproduction equalizer 35, and is supplied to a reproduction signal processing circuit 36. After the same write processing and error correction processing as described above are performed by the processing circuit 36, a signal (data) is output in synchronization with the reproduction clock RCKb. At this time, the supply timing of the reproduction clocks RCKa and RCKb is controlled so that the reproduction signal from the track Ai and the reproduction signal from the track Bi are alternately and continuously output as in the signal processing at the time of recording. become.

In each of the above-mentioned examples, the reproduction is performed at almost the same speed as that at the time of recording, but high-speed reproduction can be performed at a speed twice or more that at the time of recording.

[0033]

As described above, according to the present invention, the signal is reproduced without tracking by scanning the same azimuth track with three heads for one rotation of the tape guide drum.

According to this, all the signals recorded on one track can be reproduced by one rotation of the rotary drum, so that the signals can be rapidly reproduced. In addition, since the signals recorded on the same track are partially read, the reliability of the reproduced signal is improved accordingly.

When reproducing at a higher speed than during recording, a head having the same azimuth as that track scans the same track a number of times, so that the signal can be reliably reproduced even if there is a dropout. Reliability is further improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a rotary head device according to an embodiment of the present invention.

FIG. 2 is a development view of a tape guide drum for explaining the arrangement of heads.

FIG. 3 is a diagram showing a recording pattern.

FIG. 4 is a diagram showing a recording track Ai and a head scanning locus at the time of reproduction in one embodiment of the present invention when the recording speed and the reproduction speed are almost the same.

FIG. 5 is a diagram showing a relationship between a reproduction signal level and reproduction timing at that time.

FIG. 6 is a recording track Bi in one embodiment of the present invention.
FIG. 6 is a diagram showing a head scanning locus during reproduction.

FIG. 7 is a diagram showing a relationship between a reproduction signal level and reproduction timing at that time.

FIG. 8 is a diagram showing a recording track Ai and a head scanning locus at the time of reproduction in an embodiment of the present invention when the reproduction speed is faster than the recording speed.

FIG. 9 is a diagram showing a relationship between a reproduction signal level and reproduction timing at that time.

FIG. 10 is a diagram showing a recording track Ai and a head scanning locus at the time of reproduction in an embodiment of the present invention when the reproduction speed is slower than the recording speed.

FIG. 11 is a diagram showing a relationship between a reproduction signal level and reproduction timing at that time.

FIG. 12 is a block diagram showing a circuit configuration of a reproducing system in an embodiment of the present invention.

FIG. 13 is a diagram showing a configuration of a rotary head device in a conventional non-tracking type digital recording / reproducing apparatus.

FIG. 14 is a diagram showing a recording track and a head scanning locus at the time of reproduction in a conventional non-tracking type digital recording / reproducing apparatus.

FIG. 15 is a block diagram showing a circuit configuration of a reproducing system of a conventional non-tracking type digital recording / reproducing apparatus.

16 is a diagram showing signals of respective parts in the example of FIG.

[Explanation of symbols]

1 Tape guide drum 2 magnetic tape 8, 26, 36 reproduction signal processing circuit 25,35 Regeneration equalizer AP1, BP1, AP2, BP2 reproducing head AR / W, BR / W recording / playback head

─────────────────────────────────────────────────── --Continued from the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 5/56-5/60 G11B 5/48-5/53 G11B 15/467-15/473

Claims (3)

(57) [Claims] 1. A with one track signal is recorded is divided into a plurality of blocks, high density scan from the recording of each recording track on the magnetic tape track address and the block address for each block is recorded Then read
Based on the track address and block address
In a magnetic recording / reproducing apparatus for reproducing the signal based on the above, a pair of recording / reproducing heads having different azimuths arranged at intervals of about 180 ° on the rotating drum, and the pair of recording / reproducing heads on the rotating drum.
At the position 90 ° apart from each other, and four reproducing heads having a double azimuth structure so as to face each other 180 °.
Provided, the pair of recording heads in exchange record the signal on each other to Rutotomoni, the signal reproduction is that so as to reproduce the signal from the respective same azimuth track in three heads of the same azimuth configuration Characteristic magnetic recording / reproducing device. 2. A magnetic recording / reproducing apparatus according to claim 1, wherein three heads having the same azimuth structure are arranged on the rotary drum so as to be continuous at 90 ° intervals. 3. Three pieces were continuously arranged at the 90 ° interval.
Of the heads with the same azimuth configuration, the head located in the center
Is a recording / playback head.
The read-only head according to claim 2,
Magnetic recording and reproducing device.